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Cement compositions comprising humic acid grafted fluid loss control additives and methods of using them

A technology of cement composition and additives, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as unsatisfactory properties and inability to provide ideal levels

Inactive Publication Date: 2010-01-20
HALLIBURTON ENERGY SERVICES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these fluid loss control additives do not provide the desired level of fluid loss control and / or exhibit undesirable performance (eg, dispersibility) at elevated temperatures (eg, at least about 500°F (260°C))

Method used

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  • Cement compositions comprising humic acid grafted fluid loss control additives and methods of using them
  • Cement compositions comprising humic acid grafted fluid loss control additives and methods of using them
  • Cement compositions comprising humic acid grafted fluid loss control additives and methods of using them

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A copolymer comprising a humate backbone grafted with at least four monomers selected from the following procedure is prepared according to the following procedure: acid, acrylamide, acrylic acid, VPA, DADMAC and their salts. First, sodium humate, water, defoamer, and ethylenediaminetetraacetic acid (EDTA) were added to the reactor vessel. Then to the container, add 58% by weight of Sodium salt solution of acid, 48% by weight solution of acrylamide, acrylic acid (or VPA as described in the table below), and DADMAC. The mixture was heated and maintained at a temperature of about 158°F (70°C) for one hour while purging with nitrogen. After one hour, ammonium persulfate was added to initiate polymerization. The mixture was maintained at about 158°F (70°C) for two hours. After two hours, sodium metabisulfite was added and the mixture was allowed to cool. When the mixture reached room temperature, 50% sodium hydroxide solution was added to adjust the pH range to about...

Embodiment 2

[0034] The following series of tests were conducted to compare the performance of exemplary embodiments of the fluid loss control additives of the present invention to those described in U.S. Pat. No. 4,676,317 -413 Fluid Loss Additive Comparison. Accordingly, a sample cement composition was prepared comprising the following components: Portland Class H cement, -12 retarder (0.6% bwoc), free water control additive (0.1% bwoc), fluid loss control additive (1% bwoc) and sufficient water to provide a density of 16.4 ppg. -12 Retarder is a cement set retarder available from Halliburton Energy Services, Inc. Additionally, the free water control additive used was hydroxyethyl cellulose from Halliburton Energy Services, Inc.

[0035] Regarding fluid loss control additives, sample No.1 contains -413 fluid loss additive as a fluid loss control additive. Sample Nos. 2-9 contained an exemplary embodiment of the fluid loss control additive of the present invention having a humic a...

Embodiment 3

[0038] The following additional tests were performed at elevated temperatures to compare the performance of exemplary embodiments of the fluid loss control additives of the present invention with -413 Fluid Loss Additive Comparison. Accordingly, a sample cement composition was prepared comprising the following components: Portland Class H cement, -12 set retarder, free water control additive, SSA-1 strength stabilizer, fluid loss control additive and sufficient water to provide a density of 16.4 ppg. The free water control additive used was hydroxyethyl cellulose from Halliburton Energy Services, Inc. Sample No. 10 contained no free water control additive. SSA-1 is a strength stabilizer (crystalline silica) from Halliburton Energy Services, Inc. The specific fluid loss control additives contained in each sample are listed in the table below.

[0039] After preparation, perform a fluid loss test at 1,000 psi and the temperature listed in the table below. For this series o...

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Abstract

A cement composition comprising water, a cement, and a fluid loss control additive, the fluid loss control additive comprising a graft copolymer. The graft copolymer comprises a backbone and at least four grafted monomers selected from the group consisting of 2-acrylamido-2-methylpropanesulfonic acid, acrylamide, acrylic acid, vinylphosphonic acid, diallyldimethylammonium chloride, and salts thereof. The backbone of the graft copolymer comprises a humic acid salt. The cement compositions may be used in cementing operations.

Description

technical field [0001] The present invention relates to cementing operations. More specifically, the present invention relates to cement compositions comprising a graft copolymer fluid loss control additive comprising a backbone of humate and at least four selected from the group consisting of 2- Grafting monomers of acrylamido-2-methylpropanesulfonic acid, acrylamide, acrylic acid, vinylphosphonic acid, diallyldimethylammonium chloride and their salts. The invention also relates to methods of using the compositions in well cementing operations. Background technique [0002] Well cement compositions are commonly used in subterranean operations, in particular, subterranean well construction and reinjection operations. For example, in subterranean well construction, a tubular string (eg, casing and liner) is run into the wellbore and glued in place. The method of cementing the string in situ is often referred to as "primary cementing". In a typical primary cementing operat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/487C04B28/02C04B24/28
CPCC04B24/2623C04B24/2652C04B24/32C04B24/2688C04B2103/0059C09K8/487C04B2103/46C04B28/02C04B22/0026C04B24/163
Inventor S·J·刘易斯J·查特吉B·J·金D·C·布伦内斯
Owner HALLIBURTON ENERGY SERVICES INC
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