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Channel blocking agent utilizing stratum residual polymer, and channel blocking method

A sealing agent and polymer technology, which is applied in the direction of sealing/isolation, drilling compositions, chemical instruments and methods, etc., can solve problems such as channeling in production wells and insufficient strength of residual polymers in formations, etc., and achieve Good plugging effect, simple operation, and simple preparation method

Active Publication Date: 2014-01-08
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no matter it is a fixative or a flocculant, there is a shortcoming that the strength of residual polymer in the formation is not enough, and it can only be used for profile control of injection wells. If it is used in production wells, it is easy to be carried out by subsequent displacement agents and cannot Solve the problem of channeling and accumulation in production wells

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment provides a channel blocking agent using formation residual polymer, which includes a first composition, a second composition and a third composition, wherein:

[0034] By weight percentage, the first composition includes: urotropine 0.4%, resorcinol 0.08%, and the balance is Jin 16 block injection water (salinity is 2200mg / L);

[0035] Percentage by weight, the second composition includes: 0.4% urea, 0.1% ammonium persulfate, 4.0% hydroxymethyl starch, and the balance is Jin 16 block injection water (the degree of salinity is 2200mg / L);

[0036] By weight percentage, the third composition includes: 0.1% of N,N-methylenebisacrylamide, and the balance is Jin 16 block injection water (salinity is 2200mg / L);

[0037] And, the volume ratio of the first composition, the second composition, and the third composition is 4:1:1.

[0038] Each composition of the above channel blocking agent provided in this embodiment is obtained by uniformly mixing the respective...

Embodiment 2

[0052] This embodiment provides a channel blocking agent using formation residual polymer, which includes a first composition, a second composition and a third composition, wherein:

[0053] By weight percentage, the first composition includes: urotropine 0.3%, resorcinol 0.05%, and the balance is Jin 16 block injection water (salinity is 2200mg / L);

[0054] Percentage by weight, the second composition includes: 0.3% urea, 0.08% ammonium persulfate, 3.0% hydroxymethyl starch, and the balance is Jin 16 block injection water (salinity is 2200mg / L);

[0055] By weight percentage, the third composition includes: 0.08% of N,N-methylene bisacrylamide, and the balance is Jin 16 block injection water (salinity is 2200mg / L);

[0056] And, the volume ratio of the first composition, the second composition, and the third composition is 4:1.5:1.

[0057] Each composition of the above channel blocking agent provided in this embodiment is obtained by uniformly mixing the respective componen...

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Abstract

The invention provides a channel blocking agent utilizing a stratum residual polymer. The channel blocking agent comprises a first composition, a second composition, and a third composition. The first composition comprises, by weight: 0.3-0.5% of urotropine, 0.03-0.2% of resorcinol, and balance of water. The second composition comprises, by weight: 0.3-0.5% of urea, 0.05-0.3% of ammonium persulfate, 2.0-5.0% of hydroxymethyl starch, and balance of water. The third composition comprises, by weight: 0.04-0.3% of N,N-methylene bisacrylamide, and balance of water. The invention also provides a channel blocking method with the channel blocking agent. The method comprises the steps that: the first composition is injected into an oil well; the second composition is injected into the oil well; the third composition is injected into the oil well; the channel blocking agent in the wellbore is pressed into the stratum by using water; the well is closed for 72h, and production is carried out. With the channel blocking agent, large pores in stratum can be effectively blocked by using residual polymer in the stratum, such that polymer output can be reduced, water content in oil well can be reduced, and crude oil recovery rate can be improved.

Description

technical field [0001] The invention relates to a channeling sealing agent, in particular to a channeling sealing agent utilizing residual polymers in formations, and belongs to the technical field of oil recovery in oil fields. Background technique [0002] As most oilfields enter the late stage of high water-cut development, tertiary oil recovery technology is being promoted on a large scale in most old oilfields. After Daqing Oilfield, Shengli Oilfield, and Dagang Oilfield, Henan, Liaohe, Xinjiang and other oilfields have successively carried out pilot tests , and succeeded. As the main agent of tertiary oil recovery and deep control and flooding, polyacrylamide is widely used in oil production sites. Polymers mainly exist in the formation in the form of dissolution, adsorption and capture. However, with the accumulation of time, the number of polymers in the formation continues to increase, and they are continuously produced in production wells, which not only causes a ...

Claims

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Application Information

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IPC IPC(8): C09K8/512C09K8/58E21B43/22
CPCC09K8/5045C09K8/506C09K8/5083C09K8/512E21B33/13
Inventor 刘贵满郑晓松柳荣伟刘建山孙倩茹李宝莹崔洪志李润富张玉增周培杰许占双
Owner PETROCHINA CO LTD
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