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

A technology for cementing cement slurry and control agent, which is applied in the directions of chemical instruments and methods, drilling compositions, etc., can solve the problem of large amount of liquid silicon added, and achieves less usage, good promotion and application value, and usage effect. Good results

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 liquid control agent for well cementing slurry and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The raw materials used are as follows:

[0036] The consumption of water is 100g;

[0037] Nano-attapulgite, particle size 20-50nm, dosage 20g;

[0038] Nano silica, particle size 30-100nm, dosage 30g;

[0039] The amount of polycarboxylic acid dispersant is 0.5g;

[0040] The amount of slurry stabilizer hydroxyethyl cellulose is 0.5g;

[0041] Preparation method: mix the above components, stir at high speed (12000±500 rpm), and adjust the pH of the suspension to 9 with NaOH to obtain the free liquid control agent for well cementing slurry of the present invention.

Embodiment 2

[0043] The raw materials used are as follows:

[0044] The consumption of water is 100g;

[0045] Nano-attapulgite, particle size 10-20nm, dosage 10g;

[0046] Nano silica, particle size 20-50nm, dosage 30g;

[0047] The dosage of silane copolymerization dispersant is 1g;

[0048] The amount of slurry stabilizer xanthan gum is 0.5g;

[0049] Preparation method: mix the above components, stir at high speed (12000±500 rpm), and adjust the pH of the suspension to 10 with NaOH to obtain the free liquid control agent for well cementing slurry of the present invention.

Embodiment 3

[0051] The raw materials used are as follows:

[0052] The consumption of water is 100g;

[0053] Nano-attapulgite, particle size 30-100nm, dosage 30g;

[0054] Nano silica, particle size 100-200nm, dosage 30g;

[0055] The amount of silane copolymerization dispersant is 0.5g;

[0056] The dosage of slurry stabilizer Brunei gum is 0.5g;

[0057] Preparation method: mix the above components, stir at high speed (12000±500 rpm), and adjust the pH of the suspension to 9 with NaOH to obtain the free liquid control agent for well cementing slurry of the present invention.

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Abstract

The invention relates to a free liquid controlling agent for oil well cement slurry, a preparation method, and applications thereof, and relates to the field of well cementation of oil / gas well. The free liquid controlling agent comprises blended suspension, which is composed of the following components in parts by weight: 100 parts of water, 10 to 30 parts of nano attapulgite, 20 to 40 parts of nano silica, 0.1 to 1 part of dispersant, which is at least one of polycarboxylic acid dispersant, silane polymerized dispersant, and polysulfonic acid dispersant, and 0.5 to 1 part of slurry stabilizing agent, which is at least one of hydroxyethyl cellulose, sodium carboxymethyl cellulose, xanthan gum, scleroglucan, and welan gum. The provided free liquid controlling agent can effectively eliminate or reduce free liquid in oil well cement slurry, and can be used to prepare free-liquid-free cement slurry.

Description

technical field [0001] The invention relates to a free liquid control agent for cement slurry in the field of oil and gas well cementing, and more particularly relates to a free liquid control agent for cement slurry and its preparation method and application. Background technique [0002] When cementing the diameter section, in the annular cement column, larger particles will settle under the action of gravity, and may have a tendency to aggregate and bridge plugs, and the free fluid below the bridge plugs may sometimes form water grooves or The water belt will cause the cement stone to break when it is 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 horizontal section will gradually move up. When it reaches a c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/467
Inventor 刘学鹏张明昌方春飞张林海杨龙杰黄金营穆海朋刘伟周仕明
Owner CHINA PETROLEUM & CHEM CORP
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