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Gypsum microspheres and low elastic modulus expansion cement system

A technology of gypsum microspheres and oil well cement, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of uneven distribution of pores, difficulties, difficult control of the gas expansion process, etc., and meet the needs of cementing engineering , Resist the effect of stress and strain, and ensure the effect of long-term safe production

Active Publication Date: 2017-12-08
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the gas expansion agent, it was found through research (Liu Huajie, Bu Yuhuan, Wang Xueying, Guo Xinyang. The influence of pores on the strength of gas expansion cement stone[J]. Journal of China University of Petroleum (Natural Science Edition) 2014,38(2): 75-81.), the pores produced by the gas expansion agent have the dual functions of compensating the volume shrinkage of the cement stone and reducing the elastic modulus of the cement stone, but the gas expansion process is difficult to control, and the uneven distribution of the pores will affect the strength performance of the cement stone Therefore, when applying the gas expansion agent, a special process or application technology of the gas expansion agent should be adopted to make the pore diameter distribution range more concentrated, and it is very difficult to implement these measures

Method used

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  • Gypsum microspheres and low elastic modulus expansion cement system
  • Gypsum microspheres and low elastic modulus expansion cement system
  • Gypsum microspheres and low elastic modulus expansion cement system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1 gypsum microspheres and preparation method thereof

[0033] After mixing 6g of anhydrous gypsum (625 mesh) and 14g of α-type hemihydrate gypsum (625 mesh) evenly, add them into 16g of water, and stir evenly for 1.5min. Then, at room temperature, add the gypsum suspension into 200 g of corn oil, and stir while adding, at a stirring speed of 500 r / min. After adding the gypsum suspension into the corn oil, continue stirring for 2 hours. After the stirring is finished, filter out the gypsum microspheres, wash them, and dry them at room temperature to obtain gypsum microspheres with a particle size of about 100 μm, which are recorded as G1, such as figure 1 shown.

Embodiment 2

[0034] Embodiment 2 gypsum microspheres and preparation method thereof

[0035] Mix 4g of anhydrous gypsum (800 mesh) and 16g of α-type hemihydrate gypsum (800 mesh) evenly, add them into 14g of water, and stir evenly for 2 minutes. Then, at room temperature, add the gypsum suspension into 300 g of soybean oil, and stir while adding, at a stirring rate of 600 r / min. After adding the gypsum suspension into the soybean oil, continue stirring for 2 hours. After the stirring is completed, filter out the gypsum microspheres, wash them, and dry them at room temperature to obtain gypsum microspheres with a particle size range of about 50-80 μm, which are recorded as G2, such as figure 2 shown.

Embodiment 3

[0036] Example 3 Low elastic modulus expansion cement system

[0037] Cement slurry formula: 100 parts of G grade oil well cement + 25 parts of gypsum microspheres (G1) + 8 parts of micro silicon + 65 parts of water. The resulting cement stone sample is denoted as C1.

[0038] Preparation method: dry-mix oil well cement, gypsum microspheres and micro-silicon, and then prepare cement slurry with the dry-mixed system and water according to GB19139-2003 oil well cement test method.

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Abstract

The invention discloses a gypsum microsphere and a low elastic modulus expansion cement system suitable for medium and low temperature well cementing, wherein the gypsum microsphere is obtained by reverse-phase coagulation and hardening of a certain proportion of anhydrous gypsum, α-type hemihydrate gypsum and water product. The components of the low elastic modulus expansive cement system and their weight ratios are as follows: 100 parts of oil well cement, 10 to 40 parts of gypsum microspheres, 5 to 10 parts of micro silicon, and 65 to 75 parts of water , the addition of gypsum microspheres simultaneously realizes the functions of expanding the volume of cement stone and reducing the elastic modulus of cement stone. The invention is beneficial to the long-term demand for the integrity of the cement sheath, and has important engineering significance for ensuring the cementing quality and the long-term safe production of oil and gas wells.

Description

technical field [0001] The invention relates to a gypsum microsphere and a low-elastic-modulus expansion cement system containing the gypsum microsphere, which can guarantee the cementing quality for a long time, and belongs to the field of oil and gas well cementing materials. Background technique [0002] The cementing sheath has the functions of supporting the casing and isolating the formation, and the latter is the main function. The cement sheath provides interlayer isolation to prevent interlayer channeling, avoid interlayer pollution, and ensure safe oil and gas production. To perform this function, the cement sheath must be continuous and impermeable. The volume shrinkage of annular cement stone after cement hardening is one of the main factors affecting the sealing performance of cement annulus. The volume shrinkage of cement stone mainly includes chemical shrinkage and drying shrinkage. Chemical shrinkage is a defect of cement itself; drying shrinkage is positi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/467C04B28/14C04B28/16
Inventor 柳华杰步玉环郭辛阳郭胜来王春雨
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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