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A kind of cement composition with high compressive strength and low Young's modulus cementing toughness

A technology for cement composition and compressive strength, applied in the field of oilfield cementing cement, can solve the problems of limited toughening effect and low compressive strength, and achieves a combination of good wetting performance, high compressive strength and good hydrophilic performance. Effect

Active Publication Date: 2019-10-11
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the toughening effect of these measures is limited, and the purpose of toughening is often achieved by sacrificing the compressive strength of cement stone, that is, cement stone with low Young's modulus and low compressive strength is obtained.

Method used

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  • A kind of cement composition with high compressive strength and low Young's modulus cementing toughness
  • A kind of cement composition with high compressive strength and low Young's modulus cementing toughness
  • A kind of cement composition with high compressive strength and low Young's modulus cementing toughness

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] This embodiment provides a cement composition with high compressive strength and low Young's modulus cementing toughness, and its component composition and weight parts of each component are shown in Table 1.

[0044] Table 1

[0045] cement G grade oil well cement100 Toughener Toughener containing aluminum borate whiskers3.0 Fluid loss agent Acrylamide / 2-acrylamido-2-methylpropanesulfonic acid / acrylic acid terpolymer3.0 Retarder Tetrasodium Hydroxyethylidene Diphosphonic Acid0.1 Dispersant Formaldehyde acetone condensate0.3 Defoamer Tributyl phosphate0.1 freshwater 40

[0046] Wherein, the toughening agent containing aluminum borate whiskers is prepared by the following steps:

[0047] (1) Preparation of silane coupling agent diluent: in parts by weight, 5 parts of silane coupling agent KH-550 are mixed with 500 parts of absolute ethanol to form a 1% diluent with mass fraction;

[0048] (2) Surface modification of whiskers: In parts by weight, 20 parts of aluminum bor...

Embodiment 2

[0055] This embodiment provides a cement composition with high compressive strength and low Young's modulus cementing toughness, and its component composition and weight parts of each component are shown in Table 2.

[0056] Table 2

[0057]

[0058] Wherein, the toughening agent containing aluminum borate whiskers, magnesium borate whiskers, and magnesium sulfate whiskers in a weight ratio of 3:1:1 is prepared by the following steps:

[0059] (1) Preparation of silane coupling agent diluent: In parts by weight, 10 parts of silane coupling agent KH-560 are mixed with 500 parts of absolute ethanol into a diluent with a mass fraction of 2%;

[0060] (2) Surface modification of whiskers: in parts by weight, 50 parts of whisker material (which consists of 30 parts of aluminum borate whiskers, 10 parts of magnesium borate whiskers, and 10 parts of magnesium sulfate whiskers; The length of the whiskers is 10-100μm and the diameter is 0.1-2.0μm. The length of magnesium borate whiskers is 10-...

Embodiment 3

[0065] This embodiment provides a cement composition with high compressive strength and low Young's modulus cementing toughness, and its component composition and weight parts of each component are shown in Table 3.

[0066] table 3

[0067]

[0068] Wherein, the toughening agent containing aluminum borate whiskers, magnesium borate whiskers, magnesium sulfate whiskers, and silicon carbide whiskers in a weight ratio of 3:1:1:2 is prepared by the following steps:

[0069] (1) Preparation of silane coupling agent diluent: in parts by weight, 5 parts of silane coupling agent KH-550 are mixed with 250 parts of absolute ethanol to form a diluent with a mass fraction of 2%;

[0070] (2) Surface modification of whiskers: In parts by weight, 35 parts of whisker material (which consists of 15 parts of aluminum borate whiskers, 5 parts of magnesium borate whiskers, 5 parts of magnesium sulfate whiskers, and 10 parts of silicon carbide crystals Whiskers composition; among them, aluminum borate w...

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Abstract

The invention provides an oil well toughness cement composition with high compressive strength and low Young modulus. The oil well toughness cement composition with the high compressive strength and the low Young modulus contains the components by weight ratio: 100 parts of cement, 3-10 parts of toughening agents, 3-5 parts of filtration-reducing agents, 0.05-0.1 parts of retarders, 0.1-0.5 parts of dispersing agents, 0.1-0.2 parts of defoaming agents and 30-50 parts of water. The oil well toughness cement composition with the high compressive strength and the low Young modulus can be prepared according to the API10A standard. The oil well toughness cement composition with the high compressive strength and the low Young modulus, provided by the invention, has the advantages of higher compressive strength and lower Young modulus, namely, higher toughness coefficient (compressive strength / Young modulus); and the long-time seal integrity of a shaft can be effectively improved.

Description

Technical field [0001] The invention belongs to the technical field of oilfield cementing cement, and specifically relates to a cement composition with high compressive strength and low Young's modulus cementing toughness. Background technique [0002] In recent years, with the increase in the number of domestic natural gas wells drilled, prolonged production time, accelerated gas storage construction, and increased shale gas and tight gas development efforts, the economic and efficient development model of "horizontal wells + volume fracturing" has been promoted , The integrity of wellbore sealing and the quality of long-term cementing are increasingly valued. In order to extend the service life of the cement ring and improve the cementing quality, the mechanical properties of the cement must be optimized. [0003] Compressive strength and Young's modulus are two key indicators for testing the mechanical properties of cement stones. Compressive strength is a measure of the abili...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B14/38C09K8/487
Inventor 邹双邹建龙赵宝辉石凌龙杨昆鹏刘爱萍曾建国夏元博
Owner BC P INC CHINA NAT PETROLEUM CORP