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Cement paste stabilizer and preparation method thereof

The technology of stabilizer and cement slurry is applied in the field of cement slurry stabilizer for oilfield well cementing and its preparation, and achieves the effects of ensuring cementing quality, simple and easy method, and preventing free liquid and settlement.

Inactive Publication Date: 2014-04-02
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cement slurry stabilizer can solve the problems existing in the use of the above-mentioned powdery wenlun glue

Method used

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  • Cement paste stabilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh 400g of No.5 white oil (Sinopec Maoming Branch) and put it in the slurry cup, and put the slurry cup on the variable speed stirrer, slowly add 24.0g of organic soil PF-MOLGEL treated with bentonite and quaternary ammonium salt at 120rpm (Tianjin Zhonghai Oil Service Chemical Co., Ltd.), and after stirring at this speed for 20 minutes, after the white oil was thickened, add 4.0g Span85 (Jiangsu Haian Petrochemical Factory, product brand S-85, its HLB value is 1.8) and 12.0 g Teen80 (Jiangsu Hai'an Petrochemical Factory, product brand T-80, its HLB value is 15) composed of fluid state regulator, 120rpm stirring evenly after adding 140g powdery Wenlun gum (Hebei Juxin Biochemical Co., Ltd., product Model BG3810), after stirring at a low speed of 50 rpm for 50 minutes, the cement slurry stabilizer Welan-L1 can be obtained, wherein the mass concentration of welan glue is 24.1% by weight.

Embodiment 2

[0037] Weigh 400g of No.5 white oil (Sinopec Maoming Branch) and put it in the slurry cup, and place the slurry cup on the variable speed stirrer, slowly add 20.0g of organic soil PF-MOLGEL treated with bentonite and quaternary ammonium salt at 120rpm (Tianjin Zhonghai Oilfield Chemical Co., Ltd.), and after stirring at this speed for 20 minutes, after the white oil is thickened, add 3.5g Span85 (Jiangsu Haian Petrochemical Factory, the product grade S-85 has an HLB value of 1.8) and 15.0g Teen60 (Jiangsu Haian Petrochemical Plant, product brand T-60, its HLB value is 14.5) is a flow conditioner, after stirring at 120rpm, add 160g powdered Wenlun gum (Hebei Juxin Biochemical Co., Ltd., product model BG3810), after stirring at a low speed of 50 rpm for 50 minutes, the cement slurry stabilizer Welan-L2 can be obtained, wherein the mass concentration of welan gum is 26.7%.

Embodiment 3

[0039] Weigh 400g of No.5 white oil (Sinopec Maoming Branch) and place it in a slurry cup, and place the slurry cup on a variable speed agitator, and slowly add 15.0g of organic soil PF-MOLGEL treated with bentonite and quaternary ammonium salt at 120rpm (Tianjin Zhonghai Oilfield Chemical Co., Ltd.), and after stirring at this speed for 20 minutes, after the white oil was thickened, add 5.0g Span85 (Jiangsu Haian Petrochemical Factory, product grade S-85, its HLB value is 1.8) and 9.5 g Teen20 (Jiangsu Haian Petrochemical Factory, product grade T20, its HLB value is 16.5) is a flow conditioner, after stirring at 120rpm, add 180g powdered Wenlun gum (Hebei Juxin Biochemical Co., Ltd., product model BG3810 ), after stirring at a low speed of 50 rpm for 50 minutes, the cement slurry stabilizer Welan-L3 can be obtained, wherein the mass concentration of welan glue is 29.5%.

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Abstract

The invention provides a cement paste stabilizer. The cement paste stabilizer comprises welan gum, mineral oil, organic soil and a rheology modifier, wherein the content of the welan gum is 10-60 parts, the content of the organic soil is 1-10 parts, and the content of the rheology modifier is 2-12 parts, relatively to 100 parts by weight of the mineral oil. The rheology modifier comprises a non-ionic surface active agent whose hydrophilic-lipophilic balance value is less than 4 and a non-ionic surface active agent whose hydrophilic-lipophilic balance value is more than 14. The cement paste stabilizer provided by the invention is directly added into water to hydrate and tackify quickly, the addition amount is chosen according to the requirement, the welan gum is not pretreated and is convenient and efficient to use, in addition, the cement paste stabilizer provided by the invention can prevent the cement paste from producing free liquids and settling, so as to be favorable for guaranteeing the cementing quality.

Description

technical field [0001] The invention relates to a cement slurry stabilizer and a preparation method thereof, in particular to a cement slurry stabilizer for oilfield well cementing and a preparation method thereof. Background technique [0002] Cementing is an important operation in the drilling process. Cementing is also called cementing, that is, the cement slurry is usually prepared by Portland cement, cement admixture and water, and injected into the annular space formed by the formation and the casing, which plays the role of isolation between formations and stable casing. The performance of cement slurry is one of the important factors affecting the quality of cementing. [0003] The free liquid and solid phase settlement produced by the instability of cement slurry have a great influence on the cementing quality. This is especially evident in well cementing in highly deviated sections and horizontal sections. Free liquid and solid phase settlement will cause excessi...

Claims

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Application Information

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IPC IPC(8): C09K8/467
CPCC09K8/467C04B24/32
Inventor 符军放许前富张浩李厚铭赵琥王永松罗宇维王清顺王云庆
Owner CHINA NAT OFFSHORE OIL CORP
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