A kind of cross-linked polymer microsphere-polymer composite deep control and drive agent and its application method

A cross-linked polymer and flood control agent technology, which can be used in drilling compositions, chemical instruments and methods, earthwork drilling and production, etc., and can solve problems affecting polymer flooding efficiency and weak liquid flow redirection ability , to achieve the effects of improving the application range, increasing the sweep coefficient, and improving the displacement ability

Inactive Publication Date: 2011-12-21
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, with the deepening of research and repeated field tests, the contradiction between the currently used polymer flooding and cross-linked polymer flow weak gel system for the purpose of increasing the viscosity of the displacement fluid and the field implementation conditions has gradually been exposed. For example, for strongly heterogeneous reservoirs, although the rheological properties of the injected displacement fluid can produce a certain macroscopic liquid flow redirection ability, compared with water well profile control, control and displacement technology based on high-permeability pore plugging, etc. However, its liquid flow diversion ability is relatively weak, and it is easy for the displacement fluid to break through the dominant channel formed in the high permeability layer and the long-term water injection process prematurely, which not only affects the displacement efficiency of polymer flooding, but also affects the follow-up oil-water flow. Separation system brings its own set of problems

Method used

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  • A kind of cross-linked polymer microsphere-polymer composite deep control and drive agent and its application method
  • A kind of cross-linked polymer microsphere-polymer composite deep control and drive agent and its application method
  • A kind of cross-linked polymer microsphere-polymer composite deep control and drive agent and its application method

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Effect test

Embodiment 1

[0030] Embodiment 1, cross-linked polymer microspheres-AP-P4 polymer composite deep control and flooding agent

[0031] First, add 0.5% of the calculated amount to the configured SZ36-1 oilfield simulation water according to the cross-linked polymer microsphere powder mother liquor prepared in Example 1 of the patent ZL200710063645.X, so that the mass fraction of the cross-linked polymer microspheres in the system is 300mg / L, shake well; then add the calculated amount of 0.5% viscosity-average relative molecular weight of 12.5 million hydrophobic association type partially hydrolyzed polyacrylamide (AP-P4) mother liquor, so that the mass fraction of HPAM in the system is 1450mg / L, After stirring and mixing evenly, place the cross-linked polymer microspheres-AP-P4 polymer composite deep-seated control and displacement agent at 65°C for 48 hours. In the control and displacement agent, the mass percentage of cross-linked polymer microspheres is 0.03%, the mass percentage of AP-P4...

Embodiment 2

[0032] Embodiment 2, cross-linked polymer microspheres-AP-P4 polymer composite deep control and flooding agent

[0033] First, add 0.5% of the calculated amount to the configured SZ36-1 oilfield simulation water according to the cross-linked polymer microsphere powder mother liquor prepared in Example 1 of the patent ZL200710063645.X, so that the mass fraction of the cross-linked polymer microspheres in the system is 300mg / L, shake well; then add the calculated amount of 0.5% viscosity-average relative molecular weight of 12.5 million hydrophobic association type partially hydrolyzed polyacrylamide (AP-P4) mother liquor, so that the mass fraction of HPAM in the system is 1450mg / L, After stirring and mixing evenly, place the cross-linked polymer microspheres-AP-P4 polymer composite deep-seated control and displacement agent at 65°C for 48 hours. In the control and displacement agent, the mass percentage of cross-linked polymer microspheres is 0.03%, the mass percentage of AP-P4...

Embodiment 3

[0034] Embodiment 3, cross-linked polymer microspheres-AP-P4 polymer composite deep control and flooding agent

[0035] First, add 0.5% of the calculated amount of the cross-linked polymer microsphere emulsion mother liquor prepared according to Example 1 in the patent ZL200710063645.X to the configured SZ36-1 oilfield simulated water, so that the mass fraction of the cross-linked polymer microspheres in the system is 300mg / L, shake well; then add the calculated amount of 0.5% viscosity-average relative molecular weight of 12.5 million hydrophobic association type partially hydrolyzed polyacrylamide (AP-P4) mother liquor, so that the HPAM mass fraction in the system is 1450mg / L, stir After mixing evenly, place the cross-linked polymer microspheres-AP-P4 polymer composite deep-seated flood control agent at 65°C for 48 hours. In the flood control agent, the mass percentage of cross-linked polymer microspheres is 0.03 %, the mass percentage of AP-P4 is 0.0145%, and the relative ...

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Abstract

The invention provides a cross-linked polymer microsphere-polymer composite deep water control agent and a using method thereof. The control and drive agent includes water-soluble cross-linked polymer microspheres, water-soluble polymers and water; in the composite deep-seated control and drive agent, the mass percentage of the water-soluble cross-linked polymer microspheres is 0.01% to 0.3%, The mass percent content of the water-soluble polymer is 0.05%-0.5%, and the balance is water. The cross-linked polymer microsphere-polymer composite deep control and flooding agent provided by the present invention has a higher liquid flow redirection ability than conventional polymer flooding, can delay the one-way breakthrough of the polymer solution in the application process, and improve the efficiency of polymer flooding. The sweep coefficient has a higher ability to improve the oil-water phase mobility ratio than the conventional cross-linked polymer solution, and improves the displacement ability of the cross-linked polymer solution, which is more suitable for water injection development reservoirs with heterogeneous porous media.

Description

technical field [0001] The invention relates to a cross-linked polymer microsphere-polymer composite deep control and displacement agent capable of improving the heterogeneity of oil reservoirs and increasing the oil recovery rate of water flooding development oil reservoirs and a use method thereof, belonging to the field of petroleum industry. Background technique [0002] At present, the early development of oil fields has gradually entered the middle and late stages of water flooding. How to further improve the volumetric sweep coefficient of injected water and the displacement efficiency within the water sweep volume, and economically and effectively exploit existing oil fields is a major issue to be solved urgently by the petroleum industry. One, in which the development and application of enhanced oil recovery technology has played an important role. [0003] With the deepening of research, the influence of reservoir heterogeneity on the sweep coefficient of water flo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/588E21B43/22
Inventor 郑晓宇张健马玉华杨俊茹孙君李先杰
Owner CHINA NAT OFFSHORE OIL CORP
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