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Curable low-density leaking stoppage working fluid and preparation method thereof

A working fluid, low-density technology, used in chemical instruments and methods, drilling compositions, etc., can solve problems such as staying, bridge plugs cannot form solidified bodies, etc., to prevent underground accidents, reduce waiting time, and strength development. quick effect

Inactive Publication Date: 2017-07-21
CNPC SICHUAN GASOLINEEUM GEOPHYSICAL PROSPECTING ENG TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the technical problems that the bridge plugging cannot form a solidified body and the solidified body of the cement slurry plugging is difficult to stay in the leakage layer

Method used

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  • Curable low-density leaking stoppage working fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Example 1: The density is 1.20g / cm 3 Curable low-density plugging fluid

[0052] Weigh 100 parts by weight of G-grade oil well cement, 60 parts by weight of slag, 67 parts by weight of reducing agent, 12 parts by weight of microsilica, 1.2 parts by weight of dispersant, 5 parts by weight of fluid loss agent, 0.4 parts by weight of retarder, and 1 fiber Parts by weight, simple mixing is mixed dry ash. Weigh 214 parts by weight of water and 0.5 parts by weight of defoamer in a mixing container, rotate the agitator at a speed of 4000r / min, and add the weighed mixed dry ash at a constant speed within 15 seconds, and then cover the agitator lid Continue to stir for 35 seconds at a speed of 12000r / min to complete the preparation of the curable low-density leak-stopping working fluid. After testing, the density of the curable low-density leak-stopping working fluid prepared in this example is 1.20g / cm 3 .

Embodiment 2

[0053] Example 2: Density is 1.25g / cm 3 Curable low-density plugging fluid

[0054] Weigh 100 parts by weight of G-grade oil well cement, 54 parts by weight of slag, 52 parts by weight of reducing agent, 11 parts by weight of microsilica, 1.1 parts by weight of dispersant, 5 parts by weight of fluid loss agent, 0.4 parts by weight of retarder, and 1 fiber Parts by weight, simple mixing is mixed dry ash. Weigh 196 parts by weight of water and 0.5 parts by weight of defoamer in a mixing container. The agitator rotates at a speed of 4000r / min, and the weighed mixed dry ash is added at a constant speed within 15 seconds, and the agitator cover is covered Continue stirring at a speed of 12000r / min for 35 seconds to complete the preparation of the curable low-density leak-stopping working fluid. After testing, the density of the curable low-density leak-stopping working fluid prepared in this example is 1.25g / cm 3 .

Embodiment 3

[0055] Example 3: The density is 1.30g / cm 3 Curable low-density plugging fluid

[0056] Weigh 100 parts by weight of G-grade oil well cement, 50 parts by weight of slag, 40 parts by weight of reducer, 10 parts by weight of microsilica, 0.6 parts by weight of dispersant, 4 parts by weight of fluid loss agent, 0.4 parts by weight of retarder, and 1 fiber Parts by weight, simple mixing is mixed dry ash. Weigh 170 parts by weight of water and 0.5 parts by weight of defoamer in a mixing container. The agitator rotates at a speed of 4000r / min, and the weighed mixed dry ash is added at a constant speed in 15 seconds, and then the agitator lid is covered. Stirring was continued for 35 seconds at a speed of 12000r / min to complete the preparation of the curable low-density plugging working fluid. After testing, the density of the curable low-density plugging working fluid prepared in this example was 1.30g / cm 3 .

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Abstract

The invention provides a curable low-density leaking stoppage working fluid and a preparation method. The curable low-density leaking stoppage working fluid is prepared from, by weight, 100 parts of G-grade oil well cement, 44-60 parts of slag, 23-67 parts of lightening admixture, 8-12 parts of micro silicon, 0.4-1.2 parts of dispersant, 4-5 parts of fluid loss agent, 0.4 part of retarder, 1 part of fiber, 131-214 parts of water and 0.5 part of foaming agent. The density of the curable low-density leaking stoppage working fluid is 1.20-1.50 g / cm<3>, the curable low-density leaking stoppage working fluid is high in early strength and thixotropy, free of free water and good in system stability, and the technical problem that a curing body cannot be formed due to bridge plug leaking stoppage in a conventional leaking stoppage method and the cement leaking stoppage cutting body difficultly stays at a leaking layer is solved. After leaking stoppage is carried out, the formation pressure bearing capacity at the leaking layer can be improved, and the technical defects of the existing conventional leaking stoppage method are overcome.

Description

Technical field [0001] The invention belongs to the technical field of oilfield drilling, and particularly relates to a solidified low-density plugging working fluid and a preparation method thereof. The plugging working fluid is mainly used for plugging leaky formations and improving the pressure-bearing capacity of the leaky formations. Background technique [0002] In the oil drilling process, when drilling into low-pressure and easy-to-leakage formations, lost circulation often occurs, which leads to the loss of drilling fluid, contaminates the formation, and even causes the borehole to be scrapped in severe cases. At present, the main method to solve the leakage in the drilling process is to use bridge plugging and cement slurry to plug the leakage. Bridge plugging is to pump granular plugging materials of different grades into the leaking layer through drilling fluid, and then use the pressure difference to squeeze the plugging material into the cracks of the leaking layer,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/473C04B28/00C04B111/70
CPCC04B28/00C04B2111/00724C04B2111/70C04B2201/20C09K8/03C09K8/473C09K2208/08C04B18/141C04B18/146C04B24/161C04B24/2623C04B24/38C04B24/003C04B16/0633C04B2103/0068
Inventor 陈宁李志宏高果成吴付频罗丽霞邓凯刘洁唐凯沈明华朱明明
Owner CNPC SICHUAN GASOLINEEUM GEOPHYSICAL PROSPECTING ENG TECH RES INST
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