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Toughened cement paste used for gas storage wells

A technology of gas storage and cement slurry, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of cement stone elastic modulus, poor toughness, easy to be damaged, etc., and achieve good Chemical stability and compatibility, improved channeling ability, and improved penetration ability

Inactive Publication Date: 2018-02-16
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

During the operation of the gas storage well, with the injection and production of natural gas, the pressure in the casing changes periodically. The conventional cement stone has poor toughness and is easily damaged, which leads to the failure of the annulus sealing of the gas storage well, resulting in gas channeling, The annular space is under pressure, which will bring safety hazards and economic losses to the normal operation of the gas storage
At present, the existing rubber particle toughening technology can reduce the elastic modulus of cement stone, but the temperature resistance of rubber is poor, and it cannot be used in an environment exceeding 120 ° C; The elastic modulus of cement is of little help, and it cannot reduce the permeability of cement, which cannot meet the development needs of gas storage wells

Method used

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  • Toughened cement paste used for gas storage wells
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  • Toughened cement paste used for gas storage wells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1), component raw materials

[0029] Fusion-bonded epoxy resin powder: produced by CNOOC Changzhou Environmental Protection Paint Co., Ltd., model CTN-7500.

[0030] Oil well cement: high sulfate resistance (HSR) G grade oil well cement, produced by Dalian Cement Group Co., Ltd.;

[0031] Quartz sand: 200 mesh, Hongrun Quartz Silica Powder Co., Ltd.;

[0032] Fluid loss reducer: patent name: a fluid loss reducer with a temperature resistance of 200°C, the publication number is 102229797A;

[0033] Retarder: patent name: a strong inhibitory medium-high temperature oil well cement retarder and its preparation method, publication number 106008844A;

[0034] Dispersant: SXY, produced by Chengdu Chuanfeng Chemical Engineering Co., Ltd.;

[0035] Defoamer: tributyl phosphate, produced by Qingdao Huihe Chemical;

[0036] (2), component content

[0037] 3 parts of fusion-bonded epoxy resin powder, 25 parts of quartz sand, 100 parts of oil well cement, 1.5 parts of fluid l...

Embodiment 2

[0058] Component content: 5 parts of fusion-bonded epoxy resin powder, 25 parts of quartz sand, 100 parts of oil well cement, 1.5 parts of fluid loss reducer, 0.1 part of retarder, 0.2 part of dispersant, 0.2 part of defoamer, 51 parts of water .

[0059] performance testing

[0060] ① By changing the amount of epoxy resin powder added, it has little effect on the conventional properties of the cement slurry. The conventional properties are basically the same as the values ​​in Example 1, and the mechanical properties have changed. The mechanical properties of the cement stone are shown in Table 3 below:

[0061] Table 3 Mechanical properties of cement stone at different temperatures

[0062]

[0063] The test results show that the elastic modulus of epoxy resin tough cement stone in the experimental temperature range is below 4GPa, which meets the technical index of elastic modulus of less than 6GPa proposed in the "Technical Requirements for Tough Cement Slurry for Gas S...

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Abstract

Toughened cement paste used for gas storage wells is disclosed. A problem that present cement paste toughened with rubber particles cannot resist high temperatures is solved. The toughened cement paste includes oil well cement, a cement admixture and water. The toughened cement paste is characterized in that the toughened cement paste also includes sintered epoxy resin powder. The toughened cementpaste ensures temperature resistance, reduces the elasticity modulus of set cement, improves channeling sealing capability of the cement paste and compressive strength of the set cement, and meets technical needs on gas storage wells in oilfield development.

Description

technical field [0001] The invention relates to a cement slurry for well cementing in an oil field, in particular to a cement slurry with a certain toughening performance for a gas storage well. Background technique [0002] The gas storage has a long service life and high frequency of use, requiring long-term good sealing performance, and the operation safety of the entire gas storage group is determined by the cementing quality of a single well. High-quality cementing is the guarantee for the gas storage. Prerequisite for later safe operation. During the operation of the gas storage well, with the injection and production of natural gas, the pressure in the casing changes periodically. The conventional cement stone has poor toughness and is easily damaged, which leads to the failure of the annulus sealing of the gas storage well, resulting in gas channeling, The pressure in the annular space will bring safety hazards and economic losses to the normal operation of the gas ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467C09K8/493C04B28/00
CPCC04B28/00C04B2111/00724C09K8/467C09K8/493C04B24/281C04B14/06C04B2103/46C04B2103/22C04B2103/408C04B24/003
Inventor 师忠南吕斌李晓琦贾维君肖海东姜增东
Owner BC P INC CHINA NAT PETROLEUM CORP
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