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Profile controlling and flooding for weak gel complex clay and preparation method thereof

A technology of control and displacement agent and weak gel, which is applied in the field of control and displacement agent of weak gel compound clay and its preparation, can solve the problems of short action time, low control and displacement intensity, difficulty in deep oil well control and displacement, and achieve Long action time, high control and flooding intensity, and the effect of increasing oil recovery by water flooding

Inactive Publication Date: 2018-03-06
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The clay solution control and displacement agent used in the two-liquid method provided by the prior art is prone to stratification with the weak gel control and displacement agent in the oil layer, and the clay solution control and displacement agent is easy to settle near the wellbore, and the action time short, the control and displacement intensity is low, and it is difficult to realize the control and displacement of oil wells in deep layers

Method used

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  • Profile controlling and flooding for weak gel complex clay and preparation method thereof
  • Profile controlling and flooding for weak gel complex clay and preparation method thereof

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preparation example Construction

[0030] In the second aspect, the embodiment of the present invention provides a preparation method of the above-mentioned drive control agent, the preparation method comprising the following steps:

[0031] Step 101. According to the parts by weight of the components in the water-displacing agent, add clear water into the jar, then add polyacrylamide under stirring conditions, continue stirring, and then ripen for 7-9 hours to obtain a polyacrylamide solution.

[0032] Step 102: Add clay into the polyacrylamide solution under stirring, and continue stirring to obtain a polyacrylamide-clay mixed system.

[0033] Step 103, adding a basic conditioner to the polyacrylamide-clay mixing system, stirring evenly, then adding a crosslinking agent, stirring evenly again, to obtain a regulating and displacing agent for weak gel compound clay.

[0034] The preparation method of the regulating and displacing agent of the above-mentioned weak gel compound clay provided in the embodiment of ...

Embodiment 1

[0042] This embodiment provides a kind of adjusting and displacing agent of weak gel compound clay, which is prepared by the following method: add 100 parts by weight of clear water to a jar, and then mix 0.05 parts by weight of Add polyacrylamide into the jar, stir for 2 hours, mature for 8 hours, then add 0.1 parts by weight of clay into the jar, stir for 20 minutes, then add 0.001 parts by weight of sodium hydroxide into the jar, stir evenly, and finally Add 0.05 parts by weight of chromium acetate into the jar, and stir evenly to obtain the regulating and displacing agent for weak gel compound clay provided in this example.

[0043] Wherein, the mesh number of the clay is 250 mesh, and the mass percentage of each component in the clay is 80% of montmorillonite, 15% of kaolinite, and the balance of unavoidable impurities.

Embodiment 2

[0045] This embodiment provides a kind of adjusting and displacing agent of weak gel compound clay, which is prepared by the following method: add 100 parts by weight of clear water to a jar, and then mix 0.04 parts by weight of Add polyacrylamide into the jar, stir for 2.1 hours, mature for 9 hours, then add 0.12 parts by weight of clay into the jar, stir for 22 minutes, then add 0.002 parts by weight of sodium hydroxide and sodium carbonate to the jar Stir the mixture evenly, and finally add 0.06 parts by weight of chromium acetate into the jar, and stir evenly to obtain the regulating and displacing agent for weak gel compound clay provided in this example.

[0046] Wherein, the mesh number of clay is 270 meshes, and the mass percent component of each composition in clay is montmorillonite 70%, kaolinite 15%, and the unavoidable impurity of remainder, the mass ratio of sodium hydroxide and sodium carbonate 1:1.

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Abstract

The invention discloses a profile controlling and flooding agent for weak gel complex clay and a preparation method thereof, and belongs to the technical field of oil field water injection well profile controlling and flooding. The profile controlling and flooding comprises the following components in parts by weight: 0.1 to 0.4 part of clay, 0.03 to 0.08 part of polyacrylamide, 0.001 to 0.007 part of an alkaline modifier, 0.04 to 0.17 part of a cross-linking agent, and 100 parts of clear water, wherein the cross-linking agent is selected from at least one in chromic acetate, aluminum citrate,glyoxal and chromium lactate. The profile controlling and flooding agent has the characteristics that the clay and polyacrylamide solution are not laminated, the profile controlling and flooding agent can be used for oil well deep layer profile controlling and flooding, long action time and high profile controlling and flooding strength.

Description

technical field [0001] The invention relates to the technical field of control and flooding of oilfield water injection wells, in particular to a control and flooding agent for weak gel compound clay and a preparation method thereof. Background technique [0002] In the process of water flooding oil production, due to the high tension of the oil-water interface and poor wettability of the rock surface, the efficiency of water flooding oil recovery is low, and as the oil field enters the later stage of medium and high water cut production, the problem of water flooding oil production is becoming more and more serious. bigger. Due to the long-term scouring effect of the reinjection water on some oil layers, some oil layers become high-permeability oil layers, and the reinjection water mainly flows in the high-permeability oil layers, which makes the oil recovery in the heterogeneous low-permeability oil layers less, Therefore, the efficiency of water flooding oil recovery is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/588
CPCC09K8/588
Inventor 吴泽美赵强马伟娜孙玉民梁瑾刘万斗王鹏举
Owner PETROCHINA CO LTD
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