Cement fly ash profile control agent for plugging of oil and water well

A cement fly ash, oil-water well technology, applied in the direction of sealing/isolation, wellbore/well components, drilling composition, etc., can solve the problems of complex construction, high cost, low plugging strength, etc.

Inactive Publication Date: 2006-01-18
DAQING OILFIELD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the defects of low plugging strength, high cost and complicated construction of some profile control agents in the prior art, a profile control agent with high strength, low cost and simple construction is provided. The present invention is realized through the following scheme : a cement fly ash profile control agent for

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0004] Specific Embodiment 1: This embodiment is prepared by fully mixing the following components: (the amount is weight percentage) sulfoaluminate superfine cement 10-12.5, fly ash 15-17.5, carboxymethyl cellulose 0.5-0.75, Carboxymethyl hydroxyethyl cellulose 0.3-0.55, WP-2 micro-swelling agent 0.2-0.35, sulfonated tannin 0.1-0.15, alum 0-0.1, and the rest is water.

specific Embodiment approach 2

[0005] Specific embodiment two: this embodiment is made by fully mixing the following components: (amount is weight percentage) sulfoaluminate superfine cement 12.6~15, fly ash 17.6~20, carboxymethyl cellulose 0.76~0.9, Carboxymethyl hydroxyethyl cellulose 0.56-0.7, WP-2 micro-swelling agent 0.36-0.5, sulfonated tannin 0.16-0.2, alum 0.15-0.2, and the rest is water.

[0006]

[0007] The test results show that the plugging effect of all cores is very significant.

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PUM

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Abstract

The invention discloses a cement fly ash profile control agent for plugging of oil and water well comprising the constituents (by weight ratio) of, sulfoaluminate salt superfine cement 10-15, coal ash 15-20, sodium carboxymethylcellulose 0.5-0.9, carboxymethyl hydroxyethyl cellulose 0.3-0.7, WP-2 micro expansion agent 0.2-0.5, tannin sulfonate 0.1-0.2, alum 0-0.2 and balancing water.

Description

Technical field: [0001] The invention relates to a profile control agent for oil-water well plugging. Background technique: [0002] When the oilfield enters the stage of ultra-high water-cut development, the injection profile of the oil-water well is unbalanced, the water flooding level is large, and the high aquifer of the production profile breaks in, which leads to the invalid circulation of injection and production. For oil-water wells with stable interlayers, conventional technological measures have been implemented. For oil-water wells without stable interlayers or underdeveloped interlayers, the problem of invalid circulation fields can only be solved by profile control and plugging. There are many types of profile control agents at present, but some profile control agents, such as profile control and flooding type, do not have high plugging strength, will be displaced after being injected with water, and have a short validity period. However, some profile control a...

Claims

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Application Information

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IPC IPC(8): C09K8/46E21B33/12
Inventor 张建军高志刚高恒达李宜强齐玉平
Owner DAQING OILFIELD CO LTD
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