Polymer Flooding Technology Science & Technology Management Department

2011

China national Petroleum CorPoration

The Polymer Flooding Technology is the Best Choice to Enhance the Oil Recovery!

Contents

1. Introduction

3

2. Unique Technologies

4

3. Typical Cases

20

4. Scientific Research Equipment

22

5. Qualifications and Standards

28

6. Specialists

30

China National Petroleum Corporation (CNPC) is a state-authorized investment agency and a state holding company. As an integrated oil company of cross-regions, cross-industries and cross-countries, it adopts modern enterprise system to realize the integration of upstream and downstream operations, internal and external trade and production and marketing. CNPC has 17 upstream companies, 33 downstream companies and 36 large-scale marketing companies. It is China's largest producer and supplier of oil and gas, and also of refined oil produts and petrochemicals. In 2010 CNPC produced 105 million tons of crude oil and 72.5 billion cubic meters of natural gas, while crude processing volume reached 135 million tons. The total revenue of RMB1, 720 billion with a profit of RMB172.7 billion had been achieved the same year. Its profit is among the highest of the domestic enterprises in China. CNPC was ranked 10rd in Fortune Global 500 in

2010 and 5th among global top 50 oil companies. CNPC strictly follows by the combined strategies of increasing resource capacity, expanding market shares and consolidating the international role, and persists in regarding technical innovation as a key framework to advance technological progress. To develop its core businesses, focuses will be placed on the solutions of key bottleneck technologies and key proprietary technologies. Thanks to continuously improving of the technical innovation system, optimizing the configuration of technological resources and strengthening the construction of strong talent teams, CNPC's technological creativity has been considerably upgraded. Consequently, a large number of technologies have been developed independently, with its own intellectual property. The Polymer Flooding Technology is one of the representatives for major innovations of CNPC.

1

INTRoduCTIoN

The Polymer Flooding Technology is to increase the injected water viscosity by adding polymer, i.e. polyacrylamide (such as polysaccharide, etc.) is used to improve the oil to water mobility ratio, expand the sweeping volume of the displacement liquid in the reservoir and enhance the oil recovery. At the early sixties of the last century, CNPC started taking up with the exploration and practice of the Polymer Flooding Technology. Become a developer for setting stands in the field as well as the technological pioneer After over forty years of development and improvement. For oil polymer flooding in high water-cut oilfields, CNPC provides customers with the cost-effective solutions for reservoir engineering, surface engineering, oil production engineering and test engineering.

The Polymer Flooding Technology, one of the main means to enhance the oil recovery in high watercut oilfields, has got extensive application in the development of 9 oilfields both at home and abroad in which, daqing oilfield have produced over 2.4×1011lb oil in total by Polymer Flooding Technology. The CNPC has more than 200 senior experts for the research and development of Polymer Flooding Technology. Well equipped polymer flooding laboratory and a specialized service team of over 500 professionals is able to provide various technological services related to polymer flooding.

3

2

uNIQuE TEChNoloGIES

y log o n ch g Te n i d loo Polymer F Polymer flooding dynamic monitoring technology

Polymer flooding surface engineering technology Polymer flooding oil production engineering technology

Polymer flooding agent production technology

Polymer flooding reservoir engineering technology

Polymer flooding evaluation technology Polymer flooding reservoie engineering technology

Polymer flooding numerical simulation technology Polymer flooding program design optimization technology Polymer flooding teacking and adjustment technology

Polymer Flooding Technologies

Polymer flooding stratified injection technology

4

Polymer flooding production engineering technology

Polymer flooding stimulation technology Polymer flooding lifting technology Polymer flooding preparation and injection technology

Polymer flooding surface engineering technology

Polymer flooding treatment technology for produced liquid Polymer flooding reinjection technology of produced sewage water Polymer flooding dynamic monitoring techniue inproducedprofile

Polymer flooding dynamic monitoring technology

Polymer flooding dynamic monitoring technology in inproducedprofile

Polymer flooding agent production technology

Partially hydrolyzed polyacrylamide prcduction technology for oil flooding

Polymer flooding produced profile dynamic monitoring technique

ultra-high molecular weight polyacrylamide salt production technology

polymer flooding technology

2.1 Polymer FloodingTM Reservoir Engineering Technologies Polymer Flooding Reservoir Engineering Technology includes polymer flooding indoor evaluation, numerical simulation and optimal program design, as well as integrated adjustment, etc. As of the end of 2008, the polymer industrialized block-areas of daqing oilfield alone has reached 46, the geological reserves have been used of 1.45×1012bbl. and the annual oil output exceeded 198×108 bbl by polymer flooding in 7 successive years.

development course of polymer flooding technology

Indoor research

Pilot field test

1200

1057 1044 1055 1033

1000 oil production（10, 000t）

762 767

Industrialized promotion

Industrial field test

836 870

992

928 943

800 498

600 400

204

oil production in 10, 000t

200 0 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 Polymer production curve of daqing oilfield

5

uNIQuE TEChNoloGIES

2.1.1 Polymer Flooding Indoor EvaluationTM Technology The Polymer Flooding Indoor Evaluation Technology includes two main parts: physical and chemical properties detection and evaluation of polymer, and indoor core physical simulation test. The detection and evaluation of physical and chemical properties for polymer is carried on through a test of 11 physical and chemical performance indices of the polyacrylamide used for flooding, and its quality and flooding performance have been evaluated for customers The recovery laboratory of CNPC has passed ISo 9001.

Molecular weight and filtration factor determination system

The indoor core physical simulation test provides customers with basic parameters of polymer flooding mechanism study, numerical simulation and program design by means of core physical simulation test. The cores used for physical simulation may be natural cores, synthetic homogeneous and heterogeneous cores. Single tube, duplex tube and multilayer heterogeneous models are used as test model.

Polymer solution arrangement unit

6

polymer flooding technology

1.2 Polymer flooding numerical simulation softwareTM The Polymer Flooding Numerical Simulation Software® helps customers carry out the works of polymer flooding mechanism study, program optimization, effect prediction and quantification of residual oil distribution, etc., guides the implementation of the development plan and the comprehensive adjustment in the process of developing. The software has been successfully applied in many oil fields both at home and abroad, and the prediction accuracy of numerical simulation has reached above 95%.

Predicting residual oil saturation distribution by numerical simulation

1.3 optimal design and consultation of Polymer flooding program Based on the advanced reservoir management concept, CNPC provides customers with physical simulation, numerical simulation and economic evaluation services for different type of reservoirs and characteristics in different developing phases, as well as provides high-efficiency development program for polymer flooding reservoirs that is guaranteed through technologies with economic result and recovery. by the end of 2008, CNPC has conducted optimal program design and consultation for more than 50 polymer industrialized promotion block areas with an optimization design conformance ratio of more than 95%.

optimal design of Polymer flooding program

1.4 Polymer flooding tracking and adjustment technologyTM CNPC provides customers with polymer flooding adjustment measures and tracking services in the different development phases.

Problems in different phases during polymer flooding and the technologies for tracking and adjustment

7

uNIQuE TEChNoloGIES

2.2 Polymer Flooding Production Engineering Technologies Polymer Flooding Production Engineering Technology can solve the problems existed in the development of polymer flooding such as monolayer breakthrough, blockage at the surrounding area of injection-production well, shorter effective period of stimulation measures, serious eccentric wear of lifting equipment, etc.

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polymer flooding technology

2.2.1 Polymer Flooding Separate Zone Injection TechnologyTM

Pressure adjustment

Polymer Flooding Separate Zone Injection Technology

TM

high permeability layer

is able to fulfill the adjustment of

polymer injection profile adjustment, increase conformance ratio of polymer injection and improve overall development effects of polymer flooding.

Medium permeability layer

under the different reservoir conditions, provides customers with two different injection injection technologies: the concentric injection, and the separate mass and pressure, for effective control of

low permeability layer

injection rate at eachlayer and its molecular weight.

85.9% 75.6% 54.0%

63.8%

Molecular weight adjustment

diagram of injection pipes with separate mass and pressure for polymer flooding

The Resin Bonded Sand Stimulation Technology Proportion of water absorbent layers

Proportion of waterabsorbent thickness

Polymer flooding effects after separate injection

2.2.2 Polymer Flooding Stimulation TM Technology Polymer Flooding Stimulation

TM

and Stimulated

for polymer injection well is able to overcome the prop pants displacement caused by polymer flooding highviscosity fluid, decelerate early closing of artificial cracks nearby the shaft and prolong the valid period of fracturing. It has been applied totally to over 400 wells only at daqing oilfield and valid period for each measurement up to 16 months.

Injection Technology includes Chemical Compound un-plugging Technology for injection-production well

Shaft Rcsin bonded sand

Quartz sand

and Resin Bonded Sand Stimulation Technology for polymer-injection well, which is able to improve the permeability of reservoir. The Chemical Compound un-plugging Technology for injection-production well helps customers to remove the blockage caused by polymer lumps, mechanical impurities and drilling liquid pollution. The valid period of plug-removal is over six months in field application.

oil reservoir

diagram of resin bonded sand stimulation for polymer injection well

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uNIQuE TEChNoloGIES

2.2.3 Polymer flooding lifting equipment The polymer flooding lifting equipment ensures the operation efficiently and smoothly while the produced liquid contains polymer. The polymer flooding screw pump is adaptable to lifting the produced liquid of 2-250m3/d with pump efficiency of up to 65%. Polymer flooding pumping unit is able to solve the problem of produced liquid containing polymer that causes severe eccentric wear to the sucker rod, so that significantly extends the operating cycle. This technology has been applied to more than 10,000 wells in total, with an average operating cycle extending to 1,035 days from the original of 325 days.

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low-frictional resistance pump

polymer flooding technology

2.3 Polymer Flooding Surface Engineering Technologies Polymer Flooding Surface Engineering Technology provides customers with a complete set of resolutions for surface engineering that meets the development requirements of polymer flooding in oilfields.

Polymer produced sewage water treatment station

Polymer produced liquid dehydration station

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uNIQuE TEChNoloGIES

2.3.1 Polymer Injection Allocation Technology Polymer Injection Allocation Technology and its supporting facilities can satisfy the needs of injection allocation with many types of polymers. The overall viscosity loss of polymer solution is less than 30% after passing through the injection allocation system.

diverting device

Fresh water

PAM dry powder

Fresh water filter

Fresh water tank Water pump

to injection station

Fine filter

Coarse filter

oil transfer pump

Maturation tank

Water meter

Mother liquor tank

Flow-meter Water-injection well Tri-plunger pump

Process flowchart of concentrated preparation and separate injection of polymer

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polymer flooding technology

Combined Maturation and storage preparation technology

Polymer diverting device

one Pump for Multi-well Injection Technology

one (pump) Pipe for Two (multi-) Station Transportation Technology

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uNIQuE TEChNoloGIES

2.3.2 Polymer Flooding Produced liquid dehydration Technology New-structured free water remover and electric dehydrator process the produced liquid with high efficiency, in order to meet the requirements of various production targets and technical indices.

Purified oil transportation

dehydration furnace

Buffer tank

Electric dehydrator

to water disposal plant

oil from transferring station

Free water remover

Sink pump

sewage settling tank

Process flowchart of polymer flooding produced liquid dehydration station

Free water remover

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Polymer flooding electric dehydrator

polymer flooding technology

2.3.3 Polymer Flooding Produced Waste Water Reinjection Technology Patented transversal flow coalescing oil separator has solved the problem of the oil beads in high-viscosity, strong-emulsification produced water, which are very small, difficult to coalesce and separate oil and water. It achieves the targets of high-efficiency oil-water separation, Standard produced water reinjection by polymer flooding , environmental protection and hSE standards in oilfields. ●

 Transversal flow coalescing oil removal sedimentation + secondary filtration produced water disposal

technology. ●

hydro-cyclone + coagulate sedimentation + secondary bi-flow-filtration produced water treatment technology. Separation Coalescence packing packing

oil discharge oil discharge Air exhaust Coalescence element

Water inlet

Water outlet

Sludge Sludge Sludge discharge discharge discharge

Comparison of polymer flooding produced sewage before and after treatment

Structural diagram of transversal flow coalescing oil separator

Raw water

Pressure filter tank

oil pump

oil tank

Reclaimed Reclaimed water water pool pump

oil transfer pump

Buffer water tank

Backwash water tank

Back flush pump

Flow chart of transversal flow coalescing oil removal sedimentation + secondary filtration produced water disposal technology

15

uNIQuE TEChNoloGIES

2.3.4 Serial chemical treating agents for produced fluid of polymer flooding The self-developed serial chemical treating agents for produced fluid of polymer flooding have been used in conjunction with dedicated process equipment, for the purpose of solving the problems of oil-water separation of the polymer flooding produced liquid as well as the subsequent sewage treatment.

BC serial bactericide products

bactericide not added

common bactericide added

Effects by using bactericides

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bactericide BC-2001 added

polymer flooding technology

2.4 Polymer Flooding Dynamic Monitoring Technology Polymer Flooding dynamic Monitoring Technology is the well logging supporting technology applicable to injection profile and output profile of polymer flooding that can achieve dynamic monitoring of the polymer flooding injection wells and production wells, as well as effectively guides the development of polymer flooding. oil pipe sheath Centralizer Releaser detector 1 detector 2 Packer Water distributor Suction layer

Non-collective flow type electromagnetic flow monitor

Collective flow type electromagnetic flow combination monitor

Tracing-associated injection profile monitor

Pulse neutron oxygen activation monitor

differential pressure type produced liquid profile continuous monitor

Conductance cross-correlation flow produced liquid profile monitor

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uNIQuE TEChNoloGIES

2.5 Polymer Flooding Agent Production Technologies This technology provides the chemical agents for the use of polymer flooding to meet different needs. Select polymer flooding agents of different properties and specifications according to the requirements of polymer flooding technology, achieving matched injection and ensuring that the polymer flooding reaches the best results. As the biggest flooding-used polyacrylamide supplier, CNPC possessed the chemical production bases in oilfields; it has devoted to research and development activities and production for polymer flooding agents. Since 1996, the equipment for the production of polymer flooding agents was put into service, the production technology has been developing continuously, the production scale has expanded increasingly and the products have upgraded times and again. At present, 26 formats of polymer flooding agents have been produced. The super high molecular weight salt-resistant polyacrylamide products can be used to prepare polymer with sewage that both ensures the crude oil recovery and saves the fresh water resources, consequently saves the cost of sewage disposal. Thus it plays an important role for reducing the oil production cost in oilfields. At the same time, it also addresses the problem of sewage discharge and environmental protection for the oilfield.

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polymer flooding technology

2.6 Patented Technologies and Industry Standards CNPC owns more than 20 patented technologies for polymer flooding ,among,the inventions and utility models have reached up to 10 patents each. Polymer dry powder dispersing and wetting devices, utility model patent. Viscometer separated oxygen mask, utility model patent. Electrical helical ribbon screw mixer, utility model patent. low frictional resistance plunger pump, utility model patent. down-hole Polymer molecular weight and flow control device for polymer flooding multi-layer separate injection well, invention patent

Polymer flow control blanking plug

Polymer molecular weight control blanking plug

up to 20 standards for oil industry have been drawn up on the basis of CNPC polymer flooding technologies since 1993.

Technical requirement of development project design for polymer flooding Standard No.: SY/T 6683—2007

Evaluating method for polymer flooding development effect Standard No.: SY/T 6683—2007

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3

TYPICAl CASES

3.1 Polymer Flooding EOR in Multilayered Sandstone Oilfield The heterogeneous multilayered sandstone reservoir developed by water flooding features the average reservoir temperature of 45 ℃, the formation water salinity of 4,000-7,000mg/l, the average crude oil viscosity of 9mPa·s and the serious reservoir heterogeneity. In 1972, a polymer flooding field test was conducted at a small well spacing (well spacing of 75m) and obtained a clear effect of increasing oil and decreasing water under the condition of small dosage of polymer with low molecular weight, the water-cut of oil well dropped from 99% to the lowest of 60.4% and oil recovery increased by 5.1 percentage. In 1991, several polymer flooding industrial field tests were conducted in three block by the ways of wide spacing and multi-well group, resulting in a good results of oil recovery increased by more than 12%. The industrialized application of polymer flooding was started in 1995, as of the end of 2008, it has been applied in 46 blocks with an deployment area of 378.9×107sq ft, geological reserves of 1.45×1012lb and the total number of wells is 7187. In the industrialized promotion blocks, the polymer flooding oil recovery increased by 10 percent as compared with water flooding, the annual oil output by polymer flooding has been exceeded 198×108lb in 7 consecutive years and the cumulative oil production exceeded 2.2×1012lb, in which the polymer flooding oil production rate accounted for 22% of the total production in the oilfield.

3.2 Polymer Flooding EOR in Complex Fault Blocks Shengli oilfield is one of the complex fault block oilfields with high formation temperature of 65-120℃; high formation water salinity of more than 10,000mg/l and high crude oil viscosity of 40-70mPa·s. For the polymer flooding well patterns, the oil production is mostly carried out under the condition of original conventional water injection well patterns.

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polymer flooding technology

The first polymer flooding pilot test in Shengli oilfield starting from September 1992 at the third section of zhong-1 unit in Gudao oilfield. This is the first chemical flooding EoR project of CNPC which developed by using conventional injection-production pattern, combined with chemical flooding by mixed fresh water and sewage. on April 2005, 14 projects have been implemented in Gudao oilfield, covering geological reserves of 3.64×1011lb. The annual oil production with polymer flooding reaches 397×107lb, accounted for 45.4% of the annual output in the oil production plant.

3.3 Steam Drive After Polymer Flooding EOR The Kenneyak oilfield above the salt dome started exploiting in 1966 and has been developed nearly 40 years until 2003. however, bad effects of oil field development are caused by the relatively serious heterogeneity of oil reservoir and higher crude oil viscosity. The reservoirs above the salt dome of Kenneyak oilfield are characterized by shallow burid depth, weak bonding of oil layer, and the oil viscosity is higher than 100mPa.s as passed steam-flooding. The upper-salt reservoir injection polymer pilot area has been used a scale of 4 injections and 9 productions, it is put blank water flooding into production in december 2004 and starts injecting polymer solution in May 2006. After 0.237PV is injected in the test area, the water-cut decreases continuously until 78.7% minimum that is dropped by 14.7%. The effects of oil wells are outstanding and the result of oil increase and water decrease has been achieved. According to the result of numerical model simulation, it was expected that the EoR increases of 6.0% and the incremental oil per ton up to 77.2t in polymer test area till 2009. The results of preliminary economic evaluation believes that, the project payback period is only 1.95 years with the input-output ratio of 1:3.5.

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4

SCIENTIFIC RESEARCh EQuIPMENT

CNPC owns more than 200 units/sets of advanced and well-designed scientific research equipments for the study on 4 series technologies of polymer-flooding reservoir engineering, production engineering, surface engineering and dynamic monitoring.

4.1 oil Reservoir Engineering Six laboratories: laboratory for evaluation of physical and chemical properties of polymer, polymer profile control laboratory, laboratory for research and evaluation of flooding agents, chemical flooding mechanism and formulation laboratory, laboratory

for physical simulation of oil flooding, numerical simulation center for tertiary oil recovery. The major research equipments: advanced e x t e n s i o n a l r h e o m e t e r, i n t e r f a c e r h e o m e t e r, rotational viscometer, porosity-permeability-saturation detector, high-speed agitator, polygonal laser light scatterometer, polymer viscosity-average molecular weight analyzer, sulfur-nitrogen analyzer, filter factor measurement system, hydrolysis degree detector, gas liquid chromatograph, multi-function physical simulation flooding device and SuN\ SGI\hP\IBM large-scale workstations. They can

Rheometer

Physical simulation device

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polymer flooding technology

complete the researches on the rheology behavior of oil flooding system, the stability analysis of W/o and o/W interface, the explanation of chemical displacement mechanism and produced liquid treatment mechanism, the determination of emulsified oil viscosity, the determination of core porositypermeability-saturation, the simulation of mechanical shear degradation of polymers, the evaluation of physical and chemical properties of polymers, and the

study on polymer flooding numerical simulation, etc. The main application software: flooding injection and profile control numerical simulation such as PolYMER, PolYGEl, dQChEM, VIP-PolYMER, EClIPSE, their functions include polymer flooding parameter optimization design, functional description of a wide range of molecular weight injection, and description of polymer viscoelasticity,etc.

4.2 oil Production Engineering Three key laboratories for oil production engineering: layered exploitation laboratory, oil field chemical laboratory and manual lifting laboratory.

Integrated simulation test system for down-hole tools

Multi-function physical simulation device

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SCIENTIFIC RESEARCh EQuIPMENT

The major scientific research equipments: Core experimental device, acid rock reaction instrument, uV-visible spectrophotometer, particle size analyzer, multi-function water quality analyzer, and other equipment for indoor detection and evaluation of polymer flooding de-plugging and blocking agents, etc.; Testing devices for hydraulic performance of screw pumps, testing devices of deep-well pumps for indoor detection and evaluation of polymer flooding lifting equipment; Breakdown well exploitation simulation test systems and Brookfield viscometer, etc. for indoor detection and evaluation of polymer flooding layered exploitation tools. The main application software: GohFER, E-STIMPlAN3d software, PIPESIM, Stimplan analysis software, efficiency software for pumping well system, optimization design software for pumping well system, design software for optimization pumping well system, etc. and thus provide support for polymer flooding fractional treatment and pumping well highefficiency lifting.

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Sucker rod pump lifting simulation test system

polymer flooding technology

4.3 Surface Engineering The tertiary oil recovery surface engineering research laboratory is equipped with devices for the evaluation of polymer dissolution and slaking properties, as well as for the simulation of the oilfield produced emulsion liquid and produced water with rheological property of polymer solution

CIR-100 interface rheometer

CFl-1 type dynamic corrosion test loop device

Wheel-shaped pipe flowing simulation test device

Gas chromatograph

25

SCIENTIFIC RESEARCh EQuIPMENT

viscoelasticity, emulsion liquid stability and demulsifier performance. It is capable to carry out research works in the fields of preparation-injection technology, produced liquid treatment technology, produced water

treatment technology, corrosive scaling and protection technology, development of supporting chemical agents, as well as related detection and analysis technology.

Self-developed crude oil dehydration dynamic simulation test device

Crude oil dehydration/desalination dynamic simulation test device imported from CE-NATCo, the u.S.

26

Crude oil true boilingpoint distillation instrument

polymer flooding technology

4.4 dynamic Monitoring Technology An oil-gas-water polymer multiphase flow simulation laboratory with apparatus and instruments is to complete sensor research and down-hole instruments development, has introduced large-

scale instruments and equipments such as highspeed video camera system, PIV system, impedance analyzer, energy spectrum analyzer, and logic analyzer, etc.

data acquisition system and metering system

Simulated shaft

oil-water separation system and gas source

27

5

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QuAlIFICATIoNS ANd STANdARdS

The Recovery laboratory of daqing oilfield of CNPC gained the National Metrological Authentication Qualification Accreditation for polymer product quality detection and evaluation in 1998.

The oil Production Engineering Product Quality Supervision detection Center of CNPC gained the National Metrological Authentication Qualification Accreditation in 2002.

daqing oilfield design Institute of CNPC gained the Qualification Management System Authentication Certificate in September 28, 2002.

daqing oilfield design Institute of CNPC gained Special Equipment design Permit (pressure tubing) in May 14, 2003.

polymer flooding technology

daqing oilfield design Institute of CNPC gained Special Equipment design Permit (pressure vessel) in december 14, 2004.

daqing oilfield design Institute of CNPC gained Engineering design Certificate (Class A) in November 11, 2004.

daqing oilfield design Institute of CNPC gained Engineering Investigation Certificate (Class A) in March 21, 2005.

daqing oilfield logging detection Test laboratory of CNPC passed National Metrologic authentication in october, 2004.

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6

SPECIAlISTS

Wang Yupu: Expert of oil/gas development engineeering and academician of Chinese Academy of Engineering. he took charge successively in systematic work such as the secondary exploration of the old oilfield, increasing reserve and production for peripheral oilfield and tertiary recovery by chemical flooding. More than 20 papers and 3 works have been published.

Wang Demin: Academician of Chinese Academy of Engineering and oil/gas development engineering expert. he has made various significant achievements in scientific research and has gained 9 national patents and 3 foreign invention patents. More than 40 papers and 5 works have been published.

Wang Qimin: oil/gas development engineering expert and “New Iron Man”. he successively took charge in over 10 significant in situ experiments and over 40 scientific research tasks. Brought forward “Exploration Method by high-Efficiency Water flooding”,carried on the exploration experiment of “layered Exploitation Method and Continuing Stable Production”, and organized the implementation of the structural adjustment technology of "Systemic Project of Production Stabilization and Water-cut Control during high water-cut stage in daqing oilfield”.

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polymer flooding technology

Cheng Jiecheng: oil engineering expert. has worked in polymer research field for more than 20 years, took charge in significant scientific problem-tackling project for polymer flooding technology. he has more than 50 papers have been published and 6 invention patents.

Liu He: oil engineering expert. he has been engaged in the research of polymer flooding technology and its field using for many years, took charge in many practical and new matching technologies of polymer flooding and oil recovery, as well as new technology research project. he has 20 papers have been published and 10 national patents.

Zhou Yunxia: oilfield chemicals expert, doctor in Chemistry. She has been engaged in the research and production of oilfield chemistry for more than 20 years, took charge in over 10 significant scientific and research tasks e.g. research, production and application of industrialized production technology in high molecular weight salt-resistant polyacrylamide. She has 13 national invention patents.

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联系人 ：刁顺 先生 电

32

话 ：59986059

Email: [email protected]

Contact: Mr. Diao Shun Tel: 59986059 Email: [email protected]

聚 合 物 驱 油 技 术

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