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A kind of low-temperature high-strength toughness cement slurry and its preparation method and application

A high-strength and toughness, cement slurry technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of low elastic modulus, slow strength development, low strength, etc., achieve low elastic modulus, improve packing density, etc. the effect of improving the early strength

Active Publication Date: 2020-01-07
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a low-temperature high-strength toughness cement slurry with early strength, high strength, low elastic modulus and micro-expansion characteristics and its preparation method and application, which can effectively improve the slow strength development and low strength of cement stones at low temperatures. , strong brittleness, and easy shrinkage inherent defects, improve the comprehensive performance of early strength, high strength, toughness and micro-expansion of cement stone, and provide technical support for long-term, safe and effective operation of oil and gas wells and gas wells

Method used

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  • A kind of low-temperature high-strength toughness cement slurry and its preparation method and application
  • A kind of low-temperature high-strength toughness cement slurry and its preparation method and application
  • A kind of low-temperature high-strength toughness cement slurry and its preparation method and application

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Effect test

Embodiment 1

[0037] This embodiment provides a low-temperature high-strength toughness cement slurry, in parts by weight, its raw material components include:

[0038]

[0039] The present embodiment also provides the preparation method of the above-mentioned low-temperature high-strength toughness cement slurry, which includes the following steps:

[0040] Weigh the materials according to the above ratio, mix the early strength agent, low-temperature high-activity material, expansion toughness material, sulfonated acetone-formaldehyde condensate, polyvinyl alcohol and G-grade oil well cement to obtain a dry mixture;

[0041] Mix tributyl phosphate and clear water evenly to obtain a wet mix;

[0042]At the speed of 4000±200r / min, stir the dry mixture evenly into the wet mixture within 15s. After the dry mixture is completely wetted, continue stirring at the speed of 12000±500r / min for 35s to obtain low temperature and high strength. Tough cement slurry with a density of 1.88g / cm 3 . ...

Embodiment 2

[0044] This embodiment provides a low-temperature high-strength toughness cement slurry, in parts by weight, its raw material components include:

[0045]

[0046] The present embodiment also provides the preparation method of the above-mentioned low-temperature high-strength toughness cement slurry, which includes the following steps:

[0047] Weigh the materials according to the above ratio, mix the early strength agent, low-temperature high-activity material, expansion toughness material, sulfonated acetone-formaldehyde condensate, polyvinyl alcohol, modified starch and G-grade oil well cement to obtain a dry mixture;

[0048] Mix tributyl phosphate and clear water evenly to obtain a wet mix;

[0049] At the speed of 4000±200r / min, stir the dry mixture evenly into the wet mixture within 15s. After the dry mixture is completely wetted, continue stirring at the speed of 12000±500r / min for 35s to obtain low temperature and high strength. Tough cement slurry with a density ...

Embodiment 3

[0051] This embodiment provides a low-temperature high-strength toughness cement slurry, in parts by weight, its raw material components include:

[0052]

[0053] The present embodiment also provides the preparation method of the above-mentioned low-temperature high-strength toughness cement slurry, which includes the following steps:

[0054] Weigh the materials according to the above ratio, and mix the early strength agent, low-temperature high-activity material, expansion toughness material, sulfonated acetone-formaldehyde condensate and G-grade oil well cement to obtain a dry mixture;

[0055] Mix 2-acrylamido-2-methylpropanesulfonic acid, hydroxyethylidene diphosphonic acid, tributyl phosphate and clear water evenly to obtain a wet mixture;

[0056] At the speed of 4000±200r / min, stir the dry mixture evenly into the wet mixture within 15s. After the dry mixture is completely wetted, continue stirring at the speed of 12000±500r / min for 35s to obtain low temperature and...

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Abstract

The invention provides low-temperature high-strength tough cement paste and a preparation method and application thereof. The low-temperature high-strength tough cement paste comprises, by weight, 100 parts of cement, 2-10 parts of an early strength agent, 4-20 parts of a low-temperature high-activity material, 2-10 parts of expanded tough material, 0.5-2 parts of a dispersant, 0.5-4 parts of a fluid loss agent, 0.2-2 parts of a retarder, 0.1-1 part of a defoaming agent, and 40-60 parts of water. The low-temperature high-strength tough cement paste provided herein has early strength, high strength, low elastic modulus and micro expansivity, is efficient in improving the inherent defects of set cement, such as low development speed of strength at low temperature, low strength, high brittleness and shrinkage proneness, and is well applicable to cementation of compact horizontal oil wells, coal-bed gas wells and other wells, the oil-gas well envelopment cycle is shortened, cementation quality is improved, the service life of an oil-gas well is extended, and technical support is provided for long-term safe efficient operation of an oil-gas well.

Description

technical field [0001] The invention belongs to the technical field of oilfield exploitation, and relates to a low-temperature high-strength toughness cement slurry and a preparation method and application thereof. Background technique [0002] my country is rich in tight oil resources. In some areas of the country, tight oil resources are oil replacement resources that can achieve annual production of 50 million tons of oil and gas equivalent and long-term stable production. Due to the shallow burial of tight oil, low bottom hole temperature and slow cement hydration rate, the addition of tough materials further reduces the compressive strength of cement stone. Under low temperature conditions, the strength of cement stone develops slowly, the early strength is low, and the long-term strength is not high. On the one hand, the well construction period is prolonged, the cost is increased, and the economic benefits of exploration and development are reduced; Under the influen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/56
CPCC04B28/00C04B2111/00724C09K8/467C04B2103/12C04B18/141C04B14/383C04B14/4643C04B24/22C04B24/2623C04B24/003C04B24/38C04B24/16
Inventor 丁志伟于永金刘子帅张顺平张华靳建洲徐明齐奉忠周崇峰纪宏飞张弛
Owner BC P INC CHINA NAT PETROLEUM CORP
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