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Oil well cement flexibilizer

A technology of oil well cement and toughening agent, which is applied in the field of oil well cement toughening agent, can solve the problems of poor strain resistance and short service life of gas storage wells, and achieve the goal of improving toughness, reducing elastic modulus, and stabilizing mechanical properties Effect

Inactive Publication Date: 2015-12-16
CNPC BOHAI DRILLING ENG
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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 solve the problem that the existing gas storage well cementing cement has poor strain resistance and the service life of the gas storage well is short

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The raw materials were weighed according to the following mass ratio, and after mixing evenly, the product of the present invention was obtained. The test results are shown in Table 1.

[0014] Fluorine rubber powder 30g, brown powder, particle size 80 mesh, Tianjin Mingjintai Rubber.

[0015] Polyvinyl alcohol fiber 10g, REC15×12 type, length 12mm, diameter 40μm, tensile strength 1600MPa, Japan Kuraray.

[0016] Calcium carbonate 20g, white powder, AR, Tianjin Chemical Reagent Factory.

[0017] Polyacrylamide 40g, molecular weight 3 million, solid content greater than 85.0%, Beijing Zhonghuan Chemical Reagent Factory.

Embodiment 2

[0019] The raw materials were weighed according to the following mass ratio, and after mixing evenly, the product of the present invention was obtained. The test results are shown in Table 1.

[0020] Silicone rubber powder 50g, brown powder, particle size 60 mesh, Tianjin Mingjintai rubber.

[0021] Polyvinyl alcohol fiber 15g, REC15×12 type, length 12mm, diameter 40μm, tensile strength 1600MPa, Japan Kuraray.

[0022] White carbon black 25g, white powder, Tianjin Longhua Reagent Factory.

[0023] Attapulgite, 10g, Xuyi, Jiangsu.

Embodiment 3

[0025] The raw materials were weighed according to the following mass ratio, and after mixing evenly, the product of the present invention was obtained. The test results are shown in Table 1.

[0026] Silicone rubber powder 50g, brown powder, particle size 60 mesh, Hebei Zaoqiang Rubber Products Co., Ltd.

[0027] Polyvinyl alcohol fiber 15g, REC15×12 type, length 12mm, diameter 40μm, tensile strength 1600MPa, Japan Kuraray.

[0028] White carbon black 25g, white powder, Tianjin Longhua Reagent Factory.

[0029] Bentonite, 10g, Xiazi Street, Xinjiang.

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Abstract

The invention discloses an oil well cement flexibilizer. The oil well cement flexibilizer can be used as an admixture for oil well cement of oil-gas well cementing, and is prepared from the following components in parts by mass: 15-50 parts of a temperature-resistance rubber material, 0-20 parts of surface modified fibers, 10-20 parts of a stabilizer and 10-50 parts of a rheolobic modifier. The flexibilizer can be used for reducing the elasticity modulus of annulus set cement and improving the impact resistance of set cement, and is well compatible with other cement admixtures. The flexibilizer has stable normal-temperature and high-temperature performances, and can be used for improving the rheological property of cement paste, solving the problem that the annulus set cement in an oil-gas well has poor stress resistance and cannot adapt to big-frac treatment in the oil and gas exploitation process, and prolonging the service life of the oil-gas well.

Description

technical field [0001] The invention relates to an oil well cement additive for cementing oil and gas wells, in particular to a toughening agent for oil well cement. Background technique [0002] Well cementing is to use some means to effectively seal the casing string run in the open hole section and the formation. In recent years, with the increasing development of shale gas, the requirements for the cement slurry system are getting higher and higher, especially to increase the toughness of cement stone and reduce the elastic modulus of cement stone, which has gradually been included in the shale gas system. An important indicator of cementing. [0003] At present, there are three types of cement slurry admixtures that are most commonly used to increase the toughness of cement stone, latex, fiber and rubber. In the process of shale gas development, the latex cement slurry system is the most commonly used, which has the advantages of effectively preventing gas channeling ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467C04B24/28
CPCC09K8/467C04B24/28C04B24/287
Inventor 高飞宋元洪陈光孙万兴刘振通吴广福田宝振孔宪青
Owner CNPC BOHAI DRILLING ENG
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