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Consolidable leak-proof sealant

A plugging agent and anti-leakage technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of unsatisfactory sandstone oil plugging and well sealing measures, poor anti-leakage effect, low pressure bearing, etc. problems, to achieve good anti-leakage performance, safe use, and strong resident ability

Active Publication Date: 2016-06-08
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent plugging agent mainly adopts the principle of particle gradation plugging, and the leakage prevention effect is poor
In addition, the granular materials used in the plugging agent are not solidified, mainly relying on the particles themselves to physically block the formation, and the pressure is low. It is only suitable for plugging in the drilling process, and cannot meet the plugging and sealing of unconsolidated sandstone oil and gas reservoirs. Measures required

Method used

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Examples

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preparation example Construction

[0021] The preparation method of the present invention can consolidate anti-leakage plugging agent, comprises the following steps:

[0022] 1. Add cellulose to water and stir to obtain a uniformly dispersed solution;

[0023] 2. Add regulator to the solution obtained in the previous step and stir evenly;

[0024] 3. Add bridging agent to the solution obtained in the previous step and stir evenly;

[0025] 4. Add ultra-fine cement to the solution obtained in the previous step, and stir evenly;

[0026] 5. Add calcium carbonate powder to the solution obtained in the previous step and stir evenly;

[0027] 6. Add consolidated particles into the solution obtained in the previous step, and stir evenly to make the plugging agent of the present invention.

[0028] The above-mentioned preparation process is completed in a stirring tank.

[0029] The principle of the consolidated anti-leakage sealing agent of the present invention is:

[0030] 1. Combining the principle of bridgin...

Embodiment 1

[0034] Slowly add 0.15 parts of cellulose to 40.0 parts of tap water, stir and dissolve evenly; add 0.24 parts of regulator, 0.21 parts of bridging agent, 54.5 parts of superfine cement, 2.3 parts of calcium carbonate powder, and 2.6 parts of solidified Knot granules, stir well.

Embodiment 2

[0036] Slowly add 0.11 parts of cellulose to 38.0 parts of tap water, stir and dissolve evenly; add 0.31 parts of regulator, 0.38 parts of bridging agent, 52.0 parts of superfine cement, 4.3 parts of calcium carbonate powder, 4.9 parts of solidified Knot granules, stir well.

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Abstract

The invention discloses a solidifiable anti-leakage sealing and plugging agent, which is prepared from ultra-fine cement, solidifiable particles, calcium carbonate powder, bridging agents, cellulose, regulating agents and water. The solidifiable anti-leakage sealing and plugging agent is applicable to low-pressure easy-to-leak loose sandstone oil, gas reservoir sealing and plugging and well sealing measures. The solidifiable anti-leakage sealing and plugging agent has the advantages that the anti-leakage effect on loose sandstone oil and gas reservoirs is good, the solidification intensity is high, the suspension performance is good, the in-site construction is safe, the one-step sealing and plugging success rate is high, the consumption of the sealing and plugging agent is reduced, the well occupation period is shortened, and the operation cost is reduced.

Description

technical field [0001] The invention relates to a chemical plugging agent for well workover in oil fields, which is suitable for plugging and well sealing measures of low-pressure easy-to-leak loose sandstone oil reservoirs and gas reservoirs. Background technique [0002] Some unconsolidated sandstone oil and gas reservoirs in China have loose formation cementation and strong heterogeneity. With the development of the block, the formation pressure drops and the leakage phenomenon is serious, which brings great difficulty in sealing high water-flooded formations at one time. In response to this problem, domestic oil fields have researched and developed some lost circulation agents in recent years, and the plugging effect has been improved, but some problems have also been exposed, such as the large amount of plugging agent used, the low success rate of one-time plugging, and the need for multiple constructions to meet the plugging requirements. and well closure measures. In...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/467
CPCC04B28/00C09K8/426C09K8/467C09K8/487C09K2208/08C09K2208/10C09K2208/18C04B14/28C04B24/38C04B16/06C04B24/166
Inventor 邹小萍于永生代晋光刘丽王浩刘贺高鸿宾张秋红
Owner PETROCHINA CO LTD
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