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Well cementing high-temperature inhibiting agent for oil gas well and preparation method

A retarder and technology for oil and gas wells, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as relatively large stability restrictions, and achieve the effect of wide operating temperature range

Inactive Publication Date: 2009-04-08
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it belongs to the first generation of cement retarder, and its stability is greatly limited by raw materials.

Method used

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  • Well cementing high-temperature inhibiting agent for oil gas well and preparation method
  • Well cementing high-temperature inhibiting agent for oil gas well and preparation method
  • Well cementing high-temperature inhibiting agent for oil gas well and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0023] (1) Dissolving and recrystallizing itaconic acid in deionized water for purification. Benzoyl peroxide was dissolved in a mixed solution of chloroform-methanol and recrystallized for purification.

[0024] (2) Weigh a certain amount of AMPS according to the mass ratio of AMPS to itaconic acid of 73:27.

[0025] (3) according to 2mol L -1 The concentration of N,N-dimethylpropanamide was weighed, added to a four-neck flask covered with a polyethylene lid, heated to 70°C, and nitrogen gas was passed for 10 minutes to remove oxygen.

[0026] (4) According to the order of itaconic acid first and then AMPS, add it to N,N-dimethylpropionamide in sequence, then pass nitrogen gas for 5 minutes, raise the temperature to 75°C, and add 0.05mol·L -1 benzoyl peroxide as the initiator. After reacting for one hour, it was cooled to room temperature.

[0027] (5) Add a large amount of acetone to the reacted solution at room temperature to precipitate the polymer. Redissolve the pre...

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Abstract

The invention discloses a novel cement high temperature retarder used for cementing an oil (gas) well as well as a preparing method thereof. The invention relates to a macromolecular polymer which has high temperature resistance and is prepared by using an acetone liquid to deposit and wash an itaconic acid, 2-acrylamide-2-methyl propane sulfonic acid (AMPS), benzoperoxide and the like which are taken as materials. The novel cement high temperature retarder added into a cement pulp has the characteristics of good retardation effect, good fluidity as well as salt and calcium resistance under high temperature and the like. The invention can meet the demands of safe construction on cementing depth wells and ultra-deep wells.

Description

technical field [0001] The invention relates to a high-temperature retarder for prolonging the thickening time of oil well cement slurry, and is especially suitable for the high-temperature environment existing in deep and ultra-deep well cementing. Background technique [0002] From 2004 to 2005, the Chinese government conducted a comprehensive evaluation study on my country's oil and gas resources, and the evaluation results showed that 73% of the remaining reserves of my country's oil and gas resources are buried in deep layers. With the increase of well depth, the role of high-temperature coagulants in the drilling and development of deep and ultra-deep wells is becoming more and more important. At present, the development of cement slurry retarder has made remarkable achievements. [0003] The first generation of cement retarders were lignosulfonates, which were natural resources that provided a cost-effective solution to some problems, but had some drawbacks. As a na...

Claims

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Application Information

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IPC IPC(8): C09K8/467C08F220/58C08F222/02
Inventor 步玉环魏绪伟齐志刚刘伟
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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