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Upside-down-hanging-preventing wide-temperate-zone oil well cement retarder

A technology of oil well cement and retarder, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., and can solve problems such as long waiting time, prolonging on-site waiting time, super-retarding, etc.

Inactive Publication Date: 2013-04-03
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to meet the needs of cementing construction safety, the circulating temperature at the bottom of the well is used as the test temperature of the cement slurry thickening time in the design of the cementing project. If the ability of the retarder to adapt to large temperature differences is poor, the cement with The slurry tends to wait for a long time at the top temperature, and even super-retarded phenomenon occurs, which greatly prolongs the on-site waiting time, increases drilling costs, and increases the unsafe factors of cementing

Method used

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  • Upside-down-hanging-preventing wide-temperate-zone oil well cement retarder

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Embodiment Construction

[0014] The present invention will be described in detail below in conjunction with specific embodiments.

[0015] First, a binary copolymer is prepared. Add 24.81g of 2-acrylamido-2-methylpropanesulfonic acid and 5.19g of itaconic acid into 120g of deionized water, dissolve them and add them to a three-necked flask. Put the three-necked flask into a constant temperature water bath at 60°C and start stirring , and feed nitrogen into the three-necked flask for 30 minutes to exclude oxygen. After the temperature of the aqueous solution in the three-necked flask reaches 60 ° C, add 30 g of potassium persulfate initiator solution with a concentration of 2 wt % to allow the reaction to continue for 4 hours to obtain a binary Copolymer solution. The effective content of the solution is 16.67%.

[0016] Then, 21.5g tartaric acid was added to 180g binary copolymer solution and mixed uniformly to obtain 201.5g retarder sample 1. The number of parts by weight of binary copolymer in sa...

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Abstract

The invention discloses a cement slurry retarder used for oil well cementing operation. The retarder comprises, by weight, 50-70 parts of biopolymers containing carboxylic acid groups and 30-50 parts of tartaric acid, and the average relative molecular mass of the biopolymers containing the carboxylic acid groups ranges from 2000 to 20000. The retarder is wide in applicable temperature range and high in large-temperature-difference adaptive capacity, and cement slurry added with the retarder is free of upside down hanging and can be widely applied to various shallow wells, middle-deep wells, deep wells and ultradeep wells.

Description

technical field [0001] The invention relates to an anti-hanging wide temperate oil well cement retarder for oil field cementing, which belongs to the fields of oil field chemistry and oil gas well cementing. The retarder prepared by the method is used in the cementing process of oil and gas wells to improve the thickening performance of cement slurry. Background technique [0002] After oil and gas well drilling is completed, it is necessary to run casing and pump cement slurry to seal the annular space between the casing and the formation. Usually, the cement slurry is pumped to the bottom of the well through the casing, and then returns to the wellhead or the predetermined position from the annular space, and after it solidifies, it plays the role of sealing off the oil, gas and water layers and protecting the casing. The cement slurry needs to maintain good pumpability during the pumping process, but as the hydration reaction of the active components in the cement slurry...

Claims

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Application Information

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IPC IPC(8): C09K8/467
Inventor 郭胜来步玉环柳华杰郭辛阳
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)