Low-density cement paste system

A cement slurry, low-density technology, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as incompressibility, and achieve the effects of fast hydration, improved construction safety, and improved early strength.

Inactive Publication Date: 2014-12-03
TIANJIN BO XING ENG SCI & TECH LIMITED COMPANY OF CNPC +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thickening time of cement slurry is adjustable, the compressive strength is greater than 16MPa, the settlement stability is good, and it is incompressible, which solves the problems caused by low-density cement slurry with floating beads and further improves the performance of low-density cement slurry in well cementing operations. construction safety

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Weigh 100 parts by weight of cement, 40 parts by weight of borosilicate hollow glass microspheres (25 microns), 40 parts by weight of ultrafine cement, 20 parts by weight of microsilicon, 0.1 parts by weight of silane coupling agent, 2.0 parts by weight Sodium sulfate by weight, 106 parts by weight of water, 2.5 parts by weight of fluid loss reducer BCF-200S, and then add a certain amount of retarder BXR-200L to prepare 1.20g / cm 3 low density cement paste. (Silane coupling agent, sodium sulfate, fluid loss reducer BCF-200S and other drugs are commercially available)

[0017] Table 1 1.20g / cm at different temperatures 3 Comprehensive performance of cement slurry

[0018]

[0019]

Embodiment 2

[0021] Weigh 100 parts by weight of cement, 35 parts by weight of borosilicate hollow glass microspheres (25 microns), 35 parts by weight of ultrafine cement, 15 parts by weight of microsilica, 95 parts by weight of water, and 0.08 parts by weight of silane Coupling agent, 1.5 parts by weight of sodium sulfate, 2.5 parts by weight of fluid loss reducer BCF-200S, and then add a certain amount of retarder BXR-200L to prepare 1.30g / cm 3 low density cement paste. (Silane coupling agent, sodium sulfate, fluid loss reducer BCF-200S and other drugs are commercially available)

[0022] Table 2 1.30g / cm at different temperatures 3 Comprehensive performance of cement slurry

[0023]

[0024]

Embodiment 3

[0026] Weigh 100 parts by weight of cement, 6-18 parts by weight of borosilicate hollow glass microspheres (25 microns), 25-30 parts by weight of ultrafine cement, 10-12.5 parts by weight of microsilicon, and 0.05 parts by weight of silane Coupling agent, 1.2 parts by weight of sodium sulfate, 65-85 parts by weight of water, 2.0 parts by weight of fluid loss reducer BCF-200S, and then add a certain amount of retarder BXR-200L to make 1.40-1.60g / cm 3 low density cement paste. (Silane coupling agent, sodium sulfate, fluid loss reducer BCF-200S and other drugs are commercially available)

[0027]

[0028]

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Abstract

The invention relates to a low-density cement paste system. The cement paste system comprises following components by weight: 100 parts of oil well cement, 65-106 parts of water, 6-40 parts of borosilicate hollow glass beads, 0.05-0.1 part of a silicone coupling agent, 25-40 parts of ultrafine cement, 10-20 parts of microsilica, 2-2.5 parts of a fluid loss agent, and 0.5-1.5 parts of sodium sulfate. The particle size of the microsilica having a SiO2 content larger than 94% is 0.1-0.5 [mu]m. The particle size of the ultrafine cement is 2-10 [mu]m. The density range of the cement paste is 1.20-1.60 g/cm<3>. The particle size of the borosilicate hollow glass beads is 25 [mu]m. The thickening time of the cement paste is adjustable. The 24-h compressive strength (taking 1.50 g/cm<3> as an example) is higher than 16 MPa. The cement paste system has good sedimentation stability and incompressibility, and improves construction safety of the low-density cement paste in well cementing operation.

Description

technical field [0001] The invention relates to a cement slurry system used in the cementing field of oil field completion technology, which belongs to the low-density cement slurry system. Background technique [0002] In recent years, the formation conditions encountered in the exploration and development of oil and gas resources have become more and more complex, and there are more and more cementing operations in low-pressure leaky wells, deep wells, ultra-deep wells, long sealing sections, and underbalanced drilling. The application of high-strength and low-density cement slurry system is more and more widely used for cementing construction safety, preventing pollution, and protecting oil and gas layers. [0003] As the main lightening material in high-strength and low-density cement slurry, floating beads are mainly collected by fly ash floating separation method. In recent years, with the increasing requirements for environmental protection and the improvement of flu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/473C09K8/467
CPCC09K8/473C09K8/467
Inventor 邢秀萍滕兆健谢承斌李立荣李宗要侯薇谭文礼
Owner TIANJIN BO XING ENG SCI & TECH LIMITED COMPANY OF CNPC
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