High-temperature-resistant high-strength low-density cement slurry system

A technology of high temperature resistance and cement slurry, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of low strength, high density of cement slurry system, small applicable temperature range, etc., and achieve fast strength, rapid development, The effect of shortening the waiting time

Inactive Publication Date: 2015-12-09
SINOPEC EAST CHINA PETROLEUM ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of high density, low strength and small applicable temperature range of the existing high temperature and low density cement slurry system in the cementing of fractured reservoirs.

Method used

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  • High-temperature-resistant high-strength low-density cement slurry system
  • High-temperature-resistant high-strength low-density cement slurry system

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Example 1 The density is 1.20g / cm 3 high strength low density cement slurry system

[0025] G grade oil well cement is 100 parts by weight, 25 parts of domestic hollow glass microspheres, 12 parts of micro silicon, 2 parts of early strength agent AG204, 2 parts of early strength agent BTFA-18, 3 parts of fluid loss reducer AG33S (common type), 1 part of fluid loss reducer BG33S (special for low density), 2 parts of expansion agent G401, no retarder GH-9 at 70°C, 0.3 part of retarder GH-9 at 100°C, 150 1.2 parts of retarder GH-9 at ℃, the liquid-solid ratio is 0.67, and the ratio of fluid loss reducer A and B, early strength agent A and B is adjusted according to the cement slurry condition and the thickening time required for cementing.

[0026] Prepare cement slurry according to GB / T19139 standard, and carry out high-temperature settlement stability performance, high-pressure crushing test, thickening and compressive strength test, water loss and free liquid test. Th...

Embodiment 2

[0029] Example 2 The density is 1.35g / cm 3 high strength low density cement slurry system

[0030] G grade oil well cement is 100 parts by weight, 25 parts of domestic hollow glass microspheres, 12 parts of micro silicon, 2 parts of early strength agent AG204, 2 parts of early strength agent BTFA-18, 3 parts of fluid loss reducer AG33S (common type), 1 part of fluid loss reducer (special for low density), 2 parts of expansion agent G401, no retarder GH-9 at 70°C, 0.5 part of retarder GH-9 at 100°C, 150°C 1.5 parts of retarder GH-9, the liquid-solid ratio is 0.67, and the ratio of fluid loss reducer A and B, and early strength agent A and B should be adjusted according to the condition of cement slurry and the thickening time required for well cementing.

[0031] Prepare cement slurry according to GB / T19139 standard, and carry out high-temperature settlement stability performance, high-pressure crushing test, thickening and compressive strength test, water loss and free liqu...

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Abstract

The invention relates to a high-temperature-resistant high-strength low-density cement slurry system, which is composed of following components, by weight, 100 parts of oil well cement, 10-35 parts of high-strength hollow glass beads, 1-4 parts of an high-temperature-resistant salt-resistant fluid loss agent A, 1-4 parts of an high-temperature-resistant salt-resistant fluid loss agent B, 1-2 parts of an early strength agent A, 1-2 parts of an early strength agent B, 8-15 parts of micro-silicon, 1-4 parts of an expansion agent, 0-2 parts of a retarder, and 90-150 parts of water. The invention achieves the high-temperature-resistant high-strength low-density cement slurry system.

Description

technical field [0001] The invention relates to the technical field of cement well cementing, in particular to a high-temperature-resistant, high-strength, low-density cement slurry system. Background technique [0002] At present, 40% of my country's remaining domestic oil and gas resources are distributed in fractured reservoirs with complex geological conditions and active oil and gas displays. The cementing construction in this block is prone to leakage due to long sealing sections, and the return of cement slurry cannot meet the design requirements. Therefore, Cementing must use low-density and ultra-low-density cement slurry systems to reduce the pressure of the emptying fluid column to prevent or reduce cementing construction losses. At present, the commonly used cement slurry lightening agents at home and abroad mainly include domestic ordinary floating beads, American 3M hollow glass beads and fly ash. [0003] Among them, domestic ordinary floating beads have low c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B14/22C09K8/473
Inventor 贾彦龙闫联国陆长青芦新强刘春雨李明军刘军康李万兴刘舒
Owner SINOPEC EAST CHINA PETROLEUM ENG CO LTD
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