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Plugging agent for postponing colloid foam and method thereof for oilfield high-water-content aquifer profile modification water plugging

A technology of colloidal foam and plugging agent, which is applied in the direction of chemical instruments and methods, earthwork drilling, drilling compositions, etc., and can solve problems such as unfavorable field application and high initial viscosity

Active Publication Date: 2014-12-24
CHINA UNIV OF GEOSCIENCES (BEIJING)
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Problems solved by technology

[0007] In summary, polyacrylamide and organic chromium are often used in the existing technology of profile control and water shutoff agents, but in the prior art, polyacrylamide and organic chromium are directly added to water to form a polymer cross-linking solution, the two will react immediately in water, making the initial viscosity of the system high and not conducive to field application

Method used

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  • Plugging agent for postponing colloid foam and method thereof for oilfield high-water-content aquifer profile modification water plugging
  • Plugging agent for postponing colloid foam and method thereof for oilfield high-water-content aquifer profile modification water plugging
  • Plugging agent for postponing colloid foam and method thereof for oilfield high-water-content aquifer profile modification water plugging

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Embodiment Construction

[0012] Technical scheme of the present invention is as follows:

[0013] A plugging agent for delaying colloidal foam, which is composed of foaming agent system solution and gas; wherein, in terms of mass percentage, the foaming agent system solution is composed of foaming agent 0.05-0.30%, water-in-water emulsion polymer 0.4-0.6%, multiple emulsion cross-linking agent 0.2-0.4% are uniformly dispersed in water; the sum of the mass ratio of each component of the foaming agent system solution is 100%;

[0014] The foaming agent is lauryl diethanolamine (Ninol for short), sodium lauryl sulfate, sodium dodecylbenzenesulfonate or ammonium lauryl sulfate; preferred foaming agent is lauroyl diethanolamine;

[0015] The water-in-water emulsion polymer uses a polyacrylamide (PAM) water-soluble polymer solution as an internal phase, and a polyethylene glycol-stabilized inorganic salt solution as a continuous phase to form a continuous phase that wraps the internal phase, and the two An...

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Abstract

The invention relates to a plugging agent for postponing colloid foam and a method thereof for oilfield high-water-content aquifer profile modification water plugging. The plugging agent is composed of a foaming agent system solution and gas, wherein the foaming agent system solution is formed by uniformly dispersing 0.05-0.30% of foaming agent, 0.4-0.6% of water-drum aqueous emulsion polymer and 0.2-0.4% of multiplex emulsion crosslinking agent; and the volume ratio of the foaming agent system solution to the gas under reservoir pressure is 1:(1-3). The plugging agent for postponing colloid foam is used for oilfield high-water-content aquifer profile modification water plugging, and can enhance the oil recovery rate. The invention also provides a method for oilfield high-water-content aquifer profile modification water plugging. The plugging agent has the advantages of high dissolution rate, easy preparation, low initial viscosity and the like, can satisfy on-line injection, enhances the site operability, and saves the construction time and input cost.

Description

technical field [0001] The invention relates to a plugging agent for a delaying colloidal foam system and a preparation and injection method thereof, especially for realizing deep plugging, improving water injection development, and increasing recovery in high water-cut oil fields, and belongs to the technical field of oil field chemistry. Background technique [0002] Most oilfields in my country have entered the high water cut or ultra-high water cut waterflooding development stage, the heterogeneity contradiction in the deep reservoir is intensified, and the edge / bottom water invasion is serious, especially in (thick oil layers, horizontal well production reservoirs, fractured large pore reservoirs, etc. ) is more prominent. The sweep efficiency of injected water decreases, and the bottom water ridges / cones, which leads to a decrease in oil well productivity and seriously affects the development effect of water flooding. Therefore, controlling water to stabilize oil and im...

Claims

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Application Information

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IPC IPC(8): C09K8/518E21B33/12
CPCC09K8/518C09K2208/14E21B33/13
Inventor 由庆戴彩丽王雷吴文明张建军何龙赵明伟赵福麟李亮方吉超赵健慧赵光杨帅范洪富巫光胜郭娜马淑芬伍亚军崔亚马剡李淑杰路以文
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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