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Well-cementation leakage-proof plugging cement paste system based on temperature-sensitive memory polymer, and preparation method and application of well-cementation leakage-proof plugging cement paste system

A technology of memory polymer and oil well cement, which is applied in the field of oil and gas well cementing, can solve the problems of high risk and inapplicability of thixotropic cement slurry construction, reduce the risk of cementing leakage, facilitate mixing, and good slurry fluidity Effect

Pending Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the construction risk of thixotropic cement slurry is high, and it is generally not suitable for leak-proof cementing in deep wells

Method used

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  • Well-cementation leakage-proof plugging cement paste system based on temperature-sensitive memory polymer, and preparation method and application of well-cementation leakage-proof plugging cement paste system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Cement slurry system formula: Weigh 400g of G-grade high sulfate-resistant oil well cement, 20g (5%) of temperature-sensitive memory expansion mesh, 3.2g (0.8%) of temperature-sensitive memory expansion ball, 12g (3%) of rigid particles, flexible organic Fiber 0.6g (0.15%), rigid inorganic fiber 6g (1.5%), low-density lightening material 60g (15%), swelling agent 16g (4%), suspension stabilizer 60g (15%), fluid loss reducer 40g ( 10%), retarder 12g (3%), water 300g (75%).

[0071] Preparation method: firstly weigh each component by weight according to the proportion for later use; secondly mix G-grade oil well cement, temperature-sensitive memory fiber net, temperature-sensitive memory expansion ball, rigid inorganic fiber, low-density lightening material, expansion agent, suspension stabilizer Mix evenly to obtain the dry-blended material; again, stir the fluid loss reducer, retarder and water in the slurry cup evenly to prepare a mixed solution; finally, mix the dry-b...

Embodiment 2

[0073] Cement slurry system formula: Weigh 300g of G-grade high sulfate-resistant oil well cement, 6g (2%) of temperature-sensitive memory expansion mesh, 0.9g (0.3%) of temperature-sensitive memory expansion ball, 0.3g (0.1%) of flexible organic fiber, Rigid inorganic fiber 4.5g (1.5%), low density lightening material 75g (25%), expansion agent 21g (7%), suspension stabilizer 60g (20%), fluid loss reducer 36g (12%), retarder 9g (3.0%), water 270g (90%).

[0074] The preparation method is the same as in Example 1.

Embodiment 3

[0076] Cement slurry system formula: Weigh 300g of G-grade high sulfate-resistant oil well cement, 1.5g (0.5%) of temperature-sensitive memory expansion mesh, 0.9g (0.3%) of temperature-sensitive memory expansion ball, and 0.3g (0.1%) of flexible organic fiber , 105g (35%) of low-density lightening material, 21g (7%) of expansion agent, 90g (30%) of suspension stabilizer, 45g (15%) of fluid loss reducer, 1.2g (0.4%) of retarder, 330g of water (110%).

[0077] The preparation method is the same as in Example 1.

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Abstract

The invention relates to a well-cementation leakage-proof plugging cement paste system based on a temperature-sensitive memory polymer, and a preparation method and application thereof, belonging to the field of oil and gas well cementation. The well cementation, leakage prevention and plugging cement paste system comprises the following components in parts by weight: 100 parts of oil well cement and 0.1-5 parts of temperature-sensitive memory expansion balls, 0.5 to 10 parts of a temperature-sensitive memory expansion net; 0-8 parts of rigid particles; 5-40 parts of a high-temperature suspension stabilizer; 75 to 135 parts of water; the system density of the well cementation, leakage prevention and leaking stoppage cement paste system based on the temperature-sensitive memory polymer is adjustable in the range of 1.20-1.50 g / cm < 3 >, the comprehensive performance of the cement paste is excellent, the pressure borne by 0.5-6 mm cracks is not smaller than 6 MPa when the application temperature is 90-150 DEG C, the cement paste system with the excellent leakage prevention and leaking stoppage effect is provided for well cementation of malignant leakage strata, the return height of the cement paste reaches the designed well depth, and the well cementation, leakage prevention and leaking stoppage are achieved. The well cementation quality is improved.

Description

technical field [0001] The invention relates to the field of oil and gas well cementing, and more particularly, relates to a cement slurry system for preventing leakage and plugging of wells based on a temperature-sensitive memory polymer, as well as its preparation method and application. Background technique [0002] During the drilling and completion process, due to the development of fractures and holes in the formation and the low pressure bearing capacity of the formation, the cementing fluid is easily lost or even lost during the cementing process, resulting in insufficient return of cement slurry, which seriously affects the quality of cementing. job cost. For cementing loss, it is particularly important to prevent cementing loss by optimizing the leak-proof and plugging performance of cement slurry on the basis of improving the pressure-bearing capacity of low-pressure easy-leakage layers. The cement slurry system with excellent leakage prevention and plugging perf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467E21B33/13
CPCC09K8/467E21B33/13
Inventor 高元杨广国彭金龙桑来玉李全双刘仍光王洁文
Owner CHINA PETROLEUM & CHEM CORP