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A gel-coated particle profile control agent and its on-line preparation and use method

A technology of gelation and profile control agent, which is applied in chemical instruments and methods, earthwork drilling and production, wellbore/well components, etc. It can solve the problem of difficult to achieve good oil increase and water reduction effect, inconvenient injection process, profile control agent Poor applicability and other problems, to achieve excellent plugging effect, excellent plugging effect, and convenient injection

Active Publication Date: 2020-11-10
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the preparation process of the profile control agent in the prior art is complicated and the injection process is inconvenient; and the cost of the profile control agent is relatively high, resulting in an increase in the cost of profile control, which is not practical; at the same time, the profile control agent in the prior art is suitable for It can only be applied to one oil well condition; especially for high water-cut heterogeneous sandstone reservoirs, field experience has proved that conventional small-dose and short-radius Profile control will be limited by current technology and economic conditions

Method used

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  • A gel-coated particle profile control agent and its on-line preparation and use method
  • A gel-coated particle profile control agent and its on-line preparation and use method
  • A gel-coated particle profile control agent and its on-line preparation and use method

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Embodiment 1

[0035] Embodiment 1 of the present invention discloses a gel-coated particle profile control agent, comprising the following components in weight percent: 0.15%-0.5% polymer, 0.3%-1.5% crosslinking agent, 8-15% clay and remaining water.

[0036] In order to further optimize the technical solution, the polymer is a comb polyacrylamide polymer.

[0037] In order to further optimize the technical scheme, the clay is sodium bentonite.

[0038] In order to further optimize the technical solution, the crosslinking agent is a phenolic resin prepolymer, and the weight percentage of the phenolic resin prepolymer is 0.4%-1.5%.

[0039] In order to further optimize the technical scheme, the cross-linking agent is inorganic chromium, which is formed by mixing sodium dichromate and sodium sulfite, the mass ratio of sodium dichromate and sodium sulfite is 1:2, and the weight percentage of sodium dichromate is 0.1% -0.3%.

Embodiment 2

[0041] Example 2 of the present invention discloses a gel-coated particle profile control agent, which includes 3g of comb-shaped polyacrylamide polymer, 100g of sodium bentonite, 15g of phenolic resin prepolymer and 882g of water.

[0042] An on-line preparation method of a gel-coated particle profile control agent, specifically comprising the following steps:

[0043] (1) Take comb polyacrylamide polymer, sodium bentonite and phenolic resin prepolymer according to the above formula, and set aside;

[0044] (2) Disperse the comb-shaped polyacrylamide polymer in water, and circulate and stir to form a base liquid;

[0045](3) While stirring at a low speed, add the weighed phenolic resin prepolymer to the base liquid obtained above, and stir until it completely dissolves;

[0046] (4) Add sodium bentonite and stir until evenly dispersed to obtain the final gel-coated particle profile control agent.

Embodiment 3

[0048] Example 3 of the present invention discloses a gel-coated particle profile control agent, which includes 3g of comb-shaped polyacrylamide polymer, 100g of sodium bentonite, 1g of sodium dichromate, 2g of sodium sulfite and 894g of water.

[0049] An on-line preparation method of a gel-coated particle profile control agent, specifically comprising the following steps:

[0050] (1) Take comb-shaped polyacrylamide polymer, sodium bentonite, sodium dichromate and sodium sulfite according to the above formula, and set aside;

[0051] (2) Disperse the comb-shaped polyacrylamide polymer in water, and circulate and stir to form a base liquid;

[0052] (3) While stirring at a low speed, add weighed sodium dichromate and sodium sulfite to the base liquid obtained above, and stir until it is completely dissolved;

[0053] (4) Add sodium bentonite and stir until evenly dispersed to obtain the final gel-coated particle profile control agent.

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Abstract

The invention discloses a gelated and coated particle profile control agent. The gelated and coated particle profile control agent is prepared from a polymer, a crosslinking agent, clay and water, andhas the characteristics of being convenient to inject, high in universality, low in cost and excellent in plugging effect. An online preparation method of the gelated and coated particle profile control agent is also disclosed and is simple and low in cost. An application of the gelated and coated particle profile control agent is further disclosed. Results prove that the gelated and coated particle profile control agent shows certain selective plugging capability and has high better plugging effect on a high permeable zone while causing less damage to a low permeable zone; after the high permeable zone is selectively plugged, sweep efficiency can be increased, recovery ratio can be increased, and an oil displacement effect of the polymer can be improved.

Description

technical field [0001] The invention relates to the technical field of profile control agents, in particular to a gel-coated particle profile control agent and its on-line preparation and use method. Background technique [0002] At present, deep profile control technology and related supporting technologies play an important role in tapping the remaining oil potential, and have become an important measure to control water and stabilize oil in oilfields and improve water flooding or polymer flooding. The increasingly serious problems of high water cut have also promoted this technology. theoretical research and development. Commonly used deep profile control agents include temperature-resistant and salt-resistant gels, inorganic gels, inorganic salt precipitation, pre-crosslinked gel particles, polymer microspheres, and flexible bodies. [0003] However, the preparation process of the profile control agent in the prior art is complicated and the injection process is inconve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/512C09K8/588C08J3/24C08L33/26E21B33/13
CPCC08J3/24C08J2333/26C09K8/5045C09K8/5083C09K8/512C09K8/588E21B33/13
Inventor 刘义刚王业飞韩玉贵丁名臣赵鹏仲东肖丽华白羽宋鑫钱程苑玉静兰夕堂
Owner CHINA NAT OFFSHORE OIL CORP