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Plugging thixotropic cement paste for oil-gas well and preparation method for same

A technology for oil well cement and oil and gas wells, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of difficult to guarantee durability, complex process, difficult implementation, etc., and achieve stable engineering performance, simple process, and practical scope. wide effect

Inactive Publication Date: 2013-04-17
SOUTHWEST PETROLEUM UNIV
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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 address the deficiencies in the prior art, to provide a thixotropic cement slurry for plugging oil and gas wells and its preparation method. The technical problems of leakage during well construction and production provide guarantee for later drilling and completion of oil and gas wells and long-term production, and overcome the problems of complex process, difficult implementation and difficult durability in previous methods

Method used

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  • Plugging thixotropic cement paste for oil-gas well and preparation method for same

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Effect test

Embodiment 1

[0014] Weigh 100 parts by weight of oil well cement, 200 parts by weight of density modifier, 35 parts by weight of stabilizer, 5 parts by weight of expansion agent and 3 parts by weight of dispersant and dry mix them into dry powder; measure 100 parts by weight of water, and weigh 6 parts by weight of setting time regulator Parts by weight, 10 parts by weight of the thixotropic agent, dissolved in water to obtain an aqueous solution. Then, put the aqueous solution in a special mixing container, turn the agitator at a low speed (4000±200 rpm), and add the weighed dry powder within 15 seconds, cover the lid of the agitator, and turn it at a high speed (12000±500 rpm). rpm) for 35 seconds, add 2 parts by weight of defoamer, stir gently with a wooden stick to remove air bubbles, and obtain the cement slurry for preventing external corrosion of casing of the present invention.

Embodiment 2

[0016] Weigh 100 parts by weight of oil well cement, 100 parts by weight of density modifier, 20 parts by weight of stabilizer, 3 parts by weight of expansion agent and 2 parts by weight of dispersant and dry mix them into dry powder; measure 120 parts by weight of water, weigh 3 parts by weight of setting time regulator Parts by weight, 6 parts by weight of the thixotropic agent, dissolved in water to obtain an aqueous solution. Then, put the aqueous solution in a special mixing container, turn the agitator at a low speed (4000±200 rpm), and add the weighed dry powder within 15 seconds, cover the lid of the agitator, and turn it at a high speed (12000±500 rpm). rev / min) to continue stirring for 35 seconds, add 1 part of defoamer, stir gently with a wooden stick, remove air bubbles, and obtain the cement slurry for preventing external corrosion of casing of the present invention.

Embodiment 3

[0018] Weigh 100 parts by weight of oil well cement and 0.5 parts by weight of dispersant and dry mix them into dry powder; measure 60 parts by weight of water, weigh 0.5 parts by weight of setting time modifier and 0.5 parts by weight of thixotropic agent, and dissolve them in water to obtain an aqueous solution. Then, put the aqueous solution in a special mixing container, turn the agitator at a low speed (4000±200 rpm), and add the weighed dry powder within 15 seconds, cover the lid of the agitator, and turn it at a high speed (12000±500 rpm). rpm) for 35 seconds, add 0.2 parts of defoamer, stir gently with a wooden stick to remove air bubbles, and obtain the cement slurry for preventing external corrosion of casing of the present invention.

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Abstract

The invention relates to a plugging thixotropic cement paste for an oil-gas well and a preparation method for the same. The plugging thixotropic cement paste is composed of the following constituents in parts by weight: 100 parts of oil-gas cement, 0.5-10 parts of a thixotropic agent, 0-200 parts of a density regulator, 0-35 parts of a stabilizer, 0-6 parts of a coagulation time regulator, 0-5 parts of an expander, 0.5-3 parts of a dispersant, 0-2 parts of a defoamer, and 60-150 parts of water. Via the plugging thixotropic cement paste disclosed by the invention, the technical problem of loss during the well construction process and the production process of the oil-gas well can be effectively solved on the premise of meeting the various engineering performances needed by the plugging cement paste for the oil-gas well, thus providing a guarantee on the subsequent drilling and completion as well as the safety production of the oil-gas well.

Description

technical field [0001] The invention relates to a thixotropic cement slurry for plugging oil and gas wells and a preparation method thereof. Background technique [0002] Lost circulation not only occurs during drilling, cementing, testing or workover operations, but also occurs during production due to casing damage. Therefore, lost circulation is one of the ubiquitous technical problems in petroleum engineering. With the shortage of oil and gas resources, the exploration and development of most oilfields in my country has entered deep complex formations, and the production and exploitation have also entered the middle and late stages. Many oil and gas wells have frequent well leakage problems, which have brought serious harm to the well construction, production and management of oil and gas wells. So far, oil and gas well plugging technologies mainly include the following two types: 1. Cement slurry plugging with bridging materials: in drilling and cementing construction, ...

Claims

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Application Information

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IPC IPC(8): C09K8/467
Inventor 唐欣杨远光谢应权翟腾飞黄海鸿王乐顶龚雨
Owner SOUTHWEST PETROLEUM UNIV
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