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Film-forming oil well cement fluid loss additive, and preparation method thereof

A technology for oil well cement and fluid loss reducer, which is applied in the directions of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor cementing quality stability, low performance indicators, can not meet formation cementing and other problems, and achieves improved cementation. The effect of excellent well quality and performance indicators

Inactive Publication Date: 2017-03-29
CHANGQING GUJING OF CNPC CHUANQING DRILLING ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the deepening of the development of low-efficiency oil and gas reservoirs, in order to ensure the cementing quality of oil and gas layers, fluid loss reducing agents are used more and more in cementing slurry; with the large-scale development in recent years, fluid loss reducing agents The amount of additives has been increasing in a span, and the annual demand for oil well cement fluid loss reducing agents in the region exceeds 1000T; many years of low-pressure reservoirs in many oilfields have been injected first and then recovered, resulting in high formation water content, pressure instability, regional oil, gas, water Channeling often occurs, the performance index of the particle plugging fluid loss reducing agent used is low, the water loss of the cement slurry is more than 150ml, the stability of the cementing quality is poor, and the anti-channeling effect is not good, which is far from meeting the needs of formation cementing

Method used

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  • Film-forming oil well cement fluid loss additive, and preparation method thereof

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Effect test

Embodiment 1

[0017] A film-forming oil well cement fluid loss reducer provided by the embodiment of the present invention is composed of the following components in weight percentage: 40-45% polyvinyl alcohol; 2-5% polyvinylpyrrolidone; 8-10% Dispersant; the balance is filler, and the filler can be gypsum.

[0018] Among them, the degree of polymerization of polyvinyl alcohol is 50~60, and the existing products on the market can be selected, such as the polyvinyl alcohol of model 1788 (60 mesh) produced by Anhui Wanwei Group Co., Ltd.; polyvinylpyrrolidone can also be Select existing products on the market, such as polyvinylpyrrolidone of model K30 produced by Guangdong Yuemei Chemical Co., Ltd.; the dispersant is also called a flame retardant, specifically, an oil well cement drag reducer. The dispersant can be selected from existing products on the market, such as oil well cement drag reducer produced by Henan Weihui Chemical Co., Ltd., model USZ, or model HY-008 produced by Beijing Haiy...

Embodiment 2

[0021] A film-forming oil well cement fluid loss reducer provided by the embodiment of the present invention is composed of the following components in weight percentage: 42-44% polyvinyl alcohol; 3-4% polyvinylpyrrolidone; 8.2-9.5% Dispersant; the balance is filler.

Embodiment 3

[0023] A film-forming oil well cement fluid loss reducer provided by the embodiment of the present invention is composed of the following components in weight percentage: 42% polyvinyl alcohol; 3% polyvinylpyrrolidone; 8% dispersant; the balance is stuffing.

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Abstract

The invention discloses a film-forming oil well cement fluid loss additive. The film-forming oil well cement fluid loss additive is composed of, by weight, 40 to 45% of polyvinyl alcohol, 2 to 5% of polyvinylpyrrolidone, 8 to 10% of a dispersant, and the balance a filler. A net structure is formed after adding of the film-forming oil well cement fluid loss additive containing polyvinyl alcohol into cement, and is formed via aggregation of polyvinyl alcohol; obvious interweaving effect of the net structure with cement-hydrate can be observed; the film-forming oil well cement fluid loss additive is capable of providing set cement with certain toughness; brittle rupture of set cement is not caused; and oil well shaft sealing integrality and recovery efficiency are increased.

Description

technical field [0001] The invention belongs to the technical field of oil well cement admixtures in drilling engineering, and in particular relates to a film-forming oil well cement fluid loss reducer and a preparation method thereof. Background technique [0002] With the deepening of the development of low-efficiency oil and gas reservoirs, in order to ensure the cementing quality of oil and gas layers, fluid loss reducing agents are used more and more in cementing slurry; with the large-scale development in recent years, fluid loss reducing agents The amount of additives has been increasing in a span, and the annual demand for oil well cement fluid loss reducing agents in the region exceeds 1000T; many years of low-pressure reservoirs in many oilfields have been injected first and then recovered, resulting in high formation water content, pressure instability, regional oil, gas, water Channeling often occurs, and the performance index of the particle plugging fluid loss ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/487
CPCC09K8/487
Inventor 李波白新平梅明佳董小龙窦虎清李锋
Owner CHANGQING GUJING OF CNPC CHUANQING DRILLING ENG