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Method for improving cementing plugging effect

A cementing and cementing technology, which is applied in chemical instruments and methods, earthwork drilling, sealing/isolation, etc., can solve the problem of poor sealing ability of cement and cannot meet the needs of sealing and channeling of easily leaking formations in oil fields, Can not be clogged and other problems, to achieve the effect of reducing porosity, improving success rate, and reducing damage

Inactive Publication Date: 2008-04-16
LIAOHE GASOLINEEUM EXPLORATION BUREAU
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AI Technical Summary

Problems solved by technology

[0002] At present, the plugging and channeling of oil and water wells use simple cement slurry and a small amount of cement slurry admixture to improve performance. These technologies are transplanted from the oil drilling and cementing process. Due to the poor plugging ability of forming cement stones, they cannot be effective. The ground will form a blockage in the appropriate position, resulting in a successful plugging rate of only about 30% in the oil field plugging operation. Currently, the cement slurry used for plugging includes A grade, G grade and ultra-fine cement slurry, etc.
These muds cannot currently meet the needs of sealing and channeling in oilfields that are prone to leakage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The density of G grade oil well cement is 1.75g / cm 3 cementing slurry 10m 3 , which added short fibers (cotton short fibers, carbon fibers), bridge plug materials (flexible polyurethane resin particles 3-5mm) and ultrafine materials (2000 mesh ultrafine quartz powder), and the addition of short fibers was 5% of the cement mass , the amount of bridge plug material added is 3% of the cement mass, and the amount of superfine material added is 5% of the cement mass. Use a cementing pump truck to pump to the oil layer, and squeeze it with water. At this time, a blockage is formed, and the injection is further pressurized. The cement level is reserved at 1600m. After the oil pipe is lifted up and shut down for 36 hours, the actual cement level is at 1605m. The pressure test was 15MPa, and there was no leakage within 30 minutes, and the plugging was successful once.

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Abstract

The invention discloses a method of improving the effect of blocking cement; the G-graded cement is added with short-thread fibres, bridge plug materials, super-thin materials and a retarder; blockage cement grout is injected into a stratum; blockage mud cakes and a cement plug can be formed rapidly in the thief zone of the stratum, which stops the cement grout flowing to the depths of an oil layer, thereby reducing the consumption of the cement grout, protecting the oil layer and lessening the damage to blowholes. Compared with the prior cement grout, the formed paste matrix is of good toughness and shock resistance; the added super-thin materials improve the grain size distribution of the cement grout, reduce the extent of porosity of the paste matrix, and decrease the penetrability of the cement plug, thereby prolonging the service life of the cement plug. Therefore, the adoption of the cement grout and the corresponding craftworks and measures can improve the success ratio of one-time construction of blocking the cement to more than 90 percent, and can prolong the term of validity of blocking to a certain extent. The invention is quite applicable for popularization and application on the spot.

Description

Technical field: [0001] The invention relates to a method for increasing oil well production in oil field production, in particular to a method for improving the plugging effect of cement injection. Background technique: [0002] At present, the plugging and channeling of oil and water wells use simple cement slurry and a small amount of cement slurry admixture to improve performance. These technologies are transplanted from the oil drilling and cementing process. Due to the poor plugging ability of forming cement stones, they cannot be effective. The ground will form a blockage in the appropriate position, resulting in a successful plugging rate of only about 30% in the oil field plugging operation. Currently, the cement slurry used for plugging includes A-grade, G-grade and ultra-fine cement slurries. At present, these muds cannot meet the needs of sealing and channeling of oilfields prone to leakage. . Invention content: [0003] The purpose of the present invention i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13C09K8/516
Inventor 管恩东蔡永茂
Owner LIAOHE GASOLINEEUM EXPLORATION BUREAU
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