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Composite gel type profile control agent for oil field water injection well and application thereof

A composite gel and oilfield water injection technology, which is applied in wellbore/well components, drilling composition, production fluid, etc., can solve the problems of reduced oil displacement effect, too fast rise of oil well water content, and reduced economic benefits, etc. To achieve the effect of increasing producing reserves, improving water injection effect and improving economic benefits

Inactive Publication Date: 2014-06-25
PETROCHINA CO LTD
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  • Claims
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Problems solved by technology

[0002] At present, when major oilfields in China are developing water injection in low-permeability and low-pressure reservoirs, water absorption profile tests have found that some water injection wells have large differences in water absorption in various layers, and some layers have problems with weak or no water absorption, and some oil layers have serious fingering problems , causing the water content of the oil wells affected by water injection to rise too fast, water channeling, and water flooding, resulting in reduced oil displacement effects, reduced producing reserves of low-permeability reservoirs, reduced recovery, and reduced economic benefits

Method used

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  • Composite gel type profile control agent for oil field water injection well and application thereof
  • Composite gel type profile control agent for oil field water injection well and application thereof

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Embodiment

[0017] This embodiment provides a composite gel-type profile control agent for oilfield water injection wells, which includes the following components: 18 tons of dispersant, 5.4 tons of suspending agent, 3.6 tons of thiourea, 4.5 tons of red alum, and 868.5 tons of water.

[0018] The above-mentioned composite gel-type profile control agent for oilfield water injection wells is prepared by the following method:

[0019] First inject the required clear water into the liquid mixing tank, then add dispersant, suspending agent, thiourea and red alum, and stir well to obtain a composite gel-type profile control agent for oilfield water injection wells.

[0020] Inject the composite gel-type profile control agent prepared above for oilfield water injection wells into Well Nai 1-52-50 in Naiman Oilfield for profile control operation. The water absorption layer and water absorption situation before profile control are as follows figure 1 As shown, the water absorption level and water...

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Abstract

The invention provides a composite gel type profile control agent for an oil field water injection well. The composite gel type profile control agent comprises the following components in percentage by weight: 2% of dispersing agents, 0.6% of suspending agents, 0.4% of thiocarbamide, 0.5% of red vitriol and the balance of water. The composite gel type profile control agent for the oil field water injection well, which is provided by the invention, can be used for effectively regulating the water injection interlayer difference of the water injection well and enhancing the water injection effect, thereby increasing the producing reserve of a low-permeability oil reservoir, enhancing the recovery rate, increasing the output and enhancing the economic benefit.

Description

technical field [0001] The invention relates to a composite gel-type profile control agent for oilfield water injection wells and an application thereof, belonging to the technical field of profile control for water injection wells of low-permeability and low-pressure oil reservoirs. Background technique [0002] At present, when major oilfields in China are developing water injection in low-permeability and low-pressure reservoirs, water absorption profile tests have found that some water injection wells have large differences in water absorption in various layers, and some layers have problems with weak or no water absorption, and some oil layers have serious fingering problems , leading to the rapid increase of water content, water channeling, and water flooding in the oil wells affected by water injection, resulting in reduced oil displacement effect, reduced producing reserves of low-permeability reservoirs, reduced recovery rate, and reduced economic benefits. Therefor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/508C09K8/588E21B43/20E21B43/22
CPCC09K8/5083C09K8/5045
Inventor 李作臣张忠华王群周长城詹良蔡佳荣杜凯韩柏东李守东周丽莎张秋影赵伊娜郭明刚邓春郁曹斌严飞苗贞清
Owner PETROCHINA CO LTD
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