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Oilwell cement filtrate loss reduction additive

A technology of fluid loss reducer and oil well cement, which is applied in the field of cement fluid loss reducer and cement additives. Effects of hydrolysis, prevention of free liquid precipitation, and prevention of sedimentation

Active Publication Date: 2011-09-07
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It overcomes the deficiencies of the existing AMPS copolymer to adapt to the narrow temperature range, the prepared cement paste has low shear force, and the stability of the cement paste is low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Weigh 100g 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 40g N,N'-dimethylacrylamide (DMAA), 6g acrylic acid (AA), 6g itaconic acid (IA), 0.5g N, N'-methylenebisacrylamide (MBA) was dissolved in 717g of deionized water, and 61g of 40% sodium hydroxide solution was added to adjust the pH value to 6. Add the solution into the reactor, put the reactor into a 60°C constant temperature water bath, pass nitrogen into the reactor to remove oxygen, and after the temperature of the aqueous solution in the reactor reaches 60°C, add 3g of 10% persulfuric acid Potassium solution initiates a reaction, and the reaction lasts for 5 hours to prepare a pentapolymer solution, which is dried and pulverized to obtain an oil well cement fluid loss reducer powder product. The average relative molecular weight of the obtained pentapolymer oil well cement fluid loss reducer is 420,000. Code-named as sample 1.

Embodiment 2

[0017] Weigh 100g 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 60g N,N'-dimethylacrylamide (DMAA), 8g acrylic acid (AA), 8g itaconic acid (IA), 0.3g N, N'-methylenebisacrylamide (MBA), dissolved in 689 g of deionized water. Add 65 g of 40% sodium hydroxide solution to adjust the pH to 6. Add the solution into the reactor, put the reactor into a 60°C constant temperature water bath, pass nitrogen into the reactor to remove oxygen, and after the temperature of the aqueous solution in the reactor reaches 60°C, add 3g of 10% persulfuric acid Potassium solution initiates a reaction, and the reaction lasts for 5 hours to prepare a pentapolymer solution, which is dried and pulverized to obtain an oil well cement fluid loss reducer powder product. The average relative molecular mass of the obtained pentapolymer oil well cement fluid loss reducer is 650,000. Code-named sample 2.

Embodiment 3

[0019] The weight ratio of each component and the operation method of embodiment 3 and embodiment 1 are basically the same, the difference is: 6 g of acrylic acid (AA) in embodiment 1 is replaced by 7.2 g of methacrylic acid. The oil well cement fluid loss reducer (pentapolymer) can also be prepared, and its performance is similar to that of sample 1.

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PUM

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Abstract

The invention provides a filtration-reducing agent for oil well cement, which is used in well drilling and well cementing processes of petroleum and natural gas to reduce filtration of cementing paste. The filtration-reducing agent is a penta-copolymer, and a copolymerized monometer is 2-acrylamide-2-methyl propane sulfonic acid (AMPS), N, N'-dimethyl acrylamide (DMAA), unsaturated monocarboxylicacid, unsaturated dicarboxylic acid, and N, N'-methane biacrylamide (MBA). The filtration-reducing agent has favorable filtration reducing performance and rheological performance, and wide applicabletemperature range, and is suitable for fresh-water and salt-water cementing paste.

Description

technical field [0001] The invention relates to the technical field of petroleum cementing. In particular, it relates to a cement additive for well cementing, which is a water loss reducing agent for cement, and the water loss reducing agent is used for reducing the water loss of cement slurry in the process of oil and natural gas drilling and cementing. Background technique [0002] Cement fluid loss reducer is usually used in oil and gas well cementing operations. Cement fluid loss reducing agent can enhance the water retention effect of cement slurry in oil well cementing construction, prevent the cement slurry from dehydrating in the permeable formation, ensure the stability of cement slurry, improve the strength of solidified cement stone, prevent gas channeling, and improve The impermeability of the cement sheath protects water-sensitive formations and prevents the oil and gas layers from being polluted by cement slurry filtrate and blocked by cement slurry particles....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/24
Inventor 邹建龙朱海金屈建省吕光明高永会吴达华
Owner BC P INC CHINA NAT PETROLEUM CORP
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