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A kind of free fluid control agent for well cementing slurry and its preparation method and application

A technology of cementing slurry and control agent, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of large amount of liquid silicon, etc., achieve less usage, simple preparation method, easy promotion and application value effect

Active Publication Date: 2018-07-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(Qiu Xiehe, Wang Liangcai, Guo Guangping. Evaluation of Microblock liquid silicon and its application in Chinese oilfields [J]. Drilling Fluid and Completion Fluid. 2010 (04).) The introduction of liquid silicon as a free liquid control agent has obvious effect, but the amount of liquid silicon added in this technical solution is relatively large, generally adding more than 10%

Method used

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  • A kind of free fluid control agent for well cementing slurry and its preparation method and application

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Effect test

Embodiment 1

[0031] Use raw material as follows (consumption is based on 100 parts by total weight):

[0032] Organic viscosity-lifting agent: 300 g of scleroglucan, accounting for 30 parts;

[0033] Inorganic gelling agent: 200g of basic aluminum chloride, accounting for 20 parts;

[0034] Inorganic thickener: micro silicon 498g, accounting for 49.8 parts;

[0035] Boric acid 2g, accounting for 0.2 parts.

[0036] Preparation method: mix the above-mentioned four raw materials according to the above-mentioned proportions, and then dry them in an oven at 80°C for 24 hours to obtain the free liquid control agent for cementing slurry of the present invention.

[0037] Weigh 500g of oil well cement, 215g of water, 0.5g of defoamer, 5g of fluid loss reducer, and 5g of the free liquid control agent for cementing slurry obtained above. Mix oil well cement and cement slurry with free liquid control agent to form mixed ash; put water, fluid loss reducer and defoamer in a mixing container, and st...

Embodiment 2

[0039] Use raw material as follows (consumption is based on 100 parts by total weight):

[0040] Organic sticky agent: xanthan gum 50g, accounting for 5 parts; scleroglucan 350g, accounting for 35 parts;

[0041] Inorganic gelling agent: 200g of basic aluminum chloride, accounting for 20 parts;

[0042] Inorganic thickener: micro silicon 399g, accounting for 39.9 parts;

[0043] Boric acid 1g, accounting for 0.1 part.

[0044] Preparation method: mix the above-mentioned four raw materials according to the above-mentioned proportions, and then dry them in an oven at 80°C for 24 hours to obtain the free liquid control agent for cementing slurry of the present invention.

[0045] Weigh 500g of oil well cement, 215g of water, 0.5g of defoamer, 5g of fluid loss reducer, and 5g of the free liquid control agent for cementing slurry obtained above. Mix oil well cement and cement slurry with free liquid control agent to form mixed ash; put water, fluid loss reducer and defoamer in a...

Embodiment 3

[0047] Use raw material as follows (consumption is based on 100 parts by total weight):

[0048] Organic viscosity enhancing agent: sodium carboxymethylcellulose 300g, accounting for 30 parts; Wenlun glue 200g, accounting for 20 parts;

[0049] Inorganic gelling agent: basic aluminum chloride 100g, accounting for 10 parts;

[0050] Inorganic thickener: fly ash 100g, accounting for 10 parts, micro silicon 297g, accounting for 29.7 parts;

[0051] Boric acid 3g, accounting for 0.3 parts.

[0052] Preparation method: mix the above-mentioned four raw materials according to the above-mentioned proportions, and then dry them in an oven at 80°C for 24 hours to obtain the free liquid control agent for cementing slurry of the present invention.

[0053] Weigh 500g of oil well cement, 215g of water, 0.5g of defoamer, 5g of fluid loss reducer, and 10g of the free liquid control agent for cementing slurry obtained above. Mix oil well cement and cement slurry with free liquid control ag...

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Abstract

The invention relates to a well cementing slurry free liquid control agent of the oil-gas well cementing field, a preparation method and application thereof. The well cementing slurry free liquid control agent comprises the following blend components in terms of a total weight of 100 parts: 30-50 parts of an organic viscosifier, 10-30 parts of an inorganic gelling agent, 29-50 parts of an inorganic thickening agent, and 0.1-0.3 part of a crosslinking agent. The organic viscosifier is selected from at least one of carboxymethylcellulose sodium, xanthan gum, scleroglucan, and Welan gum. The inorganic gelling agent is selected from at least one of basic aluminium chloride and sodium metasilicate. The inorganic thickening agent is selected from at least one of fly ash and micro-silicon. And the crosslinking agent is boric acid. The well cementing slurry free liquid control agent provided by the invention can effectively eliminate or reduce well cementing slurry free liquid, is convenient for preparation of well cementing zero free liquid cement slurry, and has good popularization and application value.

Description

technical field [0001] The invention relates to a free liquid control agent for cementing slurry in the field of oil and gas well cementing, and more particularly relates to a free liquid control agent for cementing slurry and its preparation method and application. Background technique [0002] When cementing the diameter section in the field of oil and gas well cementing, in the annular cement column, larger particles will settle under the action of gravity, and may have a tendency to aggregate and bridge plugs, while the position below the bridge plugs is free of liquid. Accumulation can sometimes form gutters or hoses, causing cement stones to crack when pressurized. In addition, free fluid accumulation to form water pockets also prevents cement from bonding the casing and formation. It may also gel prematurely, resulting in low or no static pressure on the formation, and gas channeling occurs. In the cementing of horizontal wells, the free liquid formed in the horizon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/467
Inventor 张明昌刘学鹏杨龙杰方春飞张林海黄金营刘伟周仕明汪晓静
Owner CHINA PETROLEUM & CHEM CORP
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