Polymer displacement agent, preparation method thereof, and oil displacement method for oil reservoirs

An oil displacing agent and a polymer technology, which are applied in the field of polymer oil displacing agents and their preparation, can solve the problems of difficulty in obtaining high-viscosity polymer oil displacing agents, and achieve good long-term oil displacing effect and high appearance. The effect of viscosity retention, excellent oil displacement

Active Publication Date: 2012-05-16
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0009] The purpose of the present invention is to overcome the problem that it is difficult to obtain a high-viscosity polymer oil displacement agent even if the anionic polyacrylamide mother liquor is prepared with clear water in the current oil field, and then diluted with the oil field produced water, and to provide a low-cost Method for preparing high-viscosity polymer oil displacement agent

Method used

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  • Polymer displacement agent, preparation method thereof, and oil displacement method for oil reservoirs
  • Polymer displacement agent, preparation method thereof, and oil displacement method for oil reservoirs
  • Polymer displacement agent, preparation method thereof, and oil displacement method for oil reservoirs

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preparation example Construction

[0017] The invention provides a method for preparing a polymer oil displacement agent. The method includes providing a first solution, the first solution contains anionic polyacrylamide, wherein the solvent of the first solution has a salinity of 3000 - 20000 mg / L of water, the anionic polyacrylamide has an anionic degree of 5-35 mole %, the method further includes irradiating the first solution with microwaves to catalyze hydrolysis.

[0018] In the present invention, the degree of salinity refers to the total content of salts in water, such as: carbonates, bicarbonates, chlorides, sulfates, Nitrates; and various sodium salts. The degree of salinity in the present invention is measured according to the gravimetric method specified in the Chinese industry standard SL79-1994.

[0019] According to the present invention, the solvent of the first solution may be water with a salinity of 3000-20000 mg / L, preferably water with a salinity of 5000-15000 mg / L, more preferably a water...

Embodiment 1

[0060] This example is used to illustrate the oil displacing agent and its preparation method according to the present invention.

[0061] With the concentration of 5000 mg / L, the viscosity-average molecular weight is 16,000,000 anionic polyacrylamide (anionic degree is 15 mol%, commercially purchased from Guangzhou Xinglai Environmental Protection Equipment Co., Ltd.) dissolved in salinity is 193 mg / L water to obtain the second solution.

[0062] Sodium dodecylbenzenesulfonate is dissolved in the concentration of 2500 mg / liter in the oilfield produced water (from Shengli Oilfield) that is 7874 mg / liter through the method specified in GB50428-2007 for sterilization and impurity removal. Gudong Oil Production Plant Sewage Treatment Station), and sodium hydroxide was added to the above mixture to adjust the pH value of the solution to 11 to obtain the third solution.

[0063] according to figure 1 According to the flow process, the above-mentioned second solution and the third...

Embodiment 2

[0067] This example is used to illustrate the oil displacing agent and its preparation method according to the present invention.

[0068] The oil displacement agent was prepared by the same method as in Example 1, except that the irradiated product was not sent into a DC electric field for polarization. Table 1 shows the initial apparent viscosity of the obtained polymer oil displacing agent (ie, the apparent viscosity measured at the end of the irradiation) and the apparent viscosity retention rate after standing for 1 hour.

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Abstract

The invention provides a method for preparing a polymer displacement agent. The method comprises the following steps of: providing a first solution, wherein the first solution comprises anionic polyacrylamide, the solvent of the first solution is water with the mineralization of 3,000-20,000 milligrams / liter, and the anion degree of the anionic polyacrylamide is 5-35 molar percent; and irradiating the first solution by using microwaves to catalyze hydrolysis. The invention also provides a polymer displacement agent prepared by the method, and an oil displacement method for oil reservoirs. In the oil displacement method, the polymer displacement agent prepared by the method is adopted and is injected into an oil well. The polymer displacement agent prepared by the method has high apparent viscosity.

Description

technical field [0001] The invention relates to a polymer oil displacement agent, a preparation method thereof and a reservoir oil displacement method. Background technique [0002] Polymer oil displacement agents represented by partially hydrolyzed polyacrylamide (HPAM) are widely used in tertiary oil recovery. The aqueous solution of partially hydrolyzed polyacrylamide has high apparent viscosity and good viscoelastic properties in the downhole, which can effectively improve the oil recovery sweep coefficient and oil displacement efficiency, thereby enhancing oil recovery. HPAM used in oil fields is usually anionic polyacrylamide, the anionic degree is usually 5-40 mol%, the viscosity-average molecular weight is generally between millions to tens of millions, and the basic structure is as follows: [0003] [0004] During the dissolution process of anionic polyacrylamide, the sodium ions on the sodium carboxylate group are easily dissociated to form carboxyl groups, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F20/56C08F8/12C09K8/588E21B43/22
Inventor 杨青张莉高峰
Owner CHINA PETROLEUM & CHEM CORP
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