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Temperature-responsive high temperature retarder suitable for oil-gas well cementation, preparation method thereof and well cementing slurry

A technology of cementing slurry and temperature response, which is applied in the preparation of high-temperature retarder and in the field of cementing slurry to achieve strong high-temperature retarding effect, weaken the side effects of excessive dispersion, and prolong the effect of thickening time

Active Publication Date: 2019-05-31
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a temperature-responsive high-temperature retarder suitable for oil and gas well cementing in order to overcome the defects in the settlement stability, temperature response characteristics, and low-temperature strength development of the retarder in the prior art. Coagulant and its preparation method and cementing cement slurry, the high-temperature retarder can realize the adjustment of the thickening time of cement slurry in the range of 50-180 ° C, while not affecting the settlement stability of cement slurry at high temperature, and at low temperature Lower cement stone has higher early strength

Method used

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  • Temperature-responsive high temperature retarder suitable for oil-gas well cementation, preparation method thereof and well cementing slurry
  • Temperature-responsive high temperature retarder suitable for oil-gas well cementation, preparation method thereof and well cementing slurry
  • Temperature-responsive high temperature retarder suitable for oil-gas well cementation, preparation method thereof and well cementing slurry

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preparation example Construction

[0046] In the present invention, by increasing the length of the alkyl chain in the monomer, a rigid hydrophobic monomer is developed. The rigid hydrophobic monomer is a rigid hydrophobic long-chain alkyl monomer that can give the The characteristics of the temperature response of synthetic polymers, therefore, the present invention uses chloropropylene and N,N-dimethyl long-chain alkyl tertiary amine (long-chain alkyl number is an even number of 14-24) to synthesize a rigid hydrophobic long-chain alkane A quaternary ammonium salt-containing monomer is used as a rigid hydrophobic monomer. The specific synthesis method includes the following steps:

[0047] (1) Add fatty alcohol and appropriate amount of catalyst into the reactor, heat the reactor, and pass monomethylamine into the reactor at a flow rate of 35kg / h-50kg / h at a temperature of 130℃ for 75-85min, and the final reactor Keep the reaction temperature at 180-200°C and the reaction time for 5-7h to synthesize N,N-dimethyl ...

Embodiment 1

[0083] This example is to illustrate the temperature-responsive high-temperature retarder prepared by the method of the present invention.

[0084] The preparation steps are as follows:

[0085] (1) Weigh 51.75 parts of 2-acrylamide-2-methylpropanesulfonic acid (monomer B), 21.6 parts of acrylic acid (monomer A), and 6 parts of hydrophobic monomer (monomer C) respectively, and use deionization Dissolve in water, the total mass concentration of the monomers in the solution is 25%, and the pH value is adjusted to 6 by a sodium hydroxide solution with a concentration of 5mol / L;

[0086] Wherein, the rigid hydrophobic monomer has a structure represented by formula (VI), and R 6 Is H, n is 21;

[0087]

[0088] (2) Adjust the temperature of the water bath to 55°C and install the reaction device. The mixed solution of 2-acrylamide-2-methylpropanesulfonic acid, acrylic acid, and hydrophobic monomer was transferred into a three-necked flask, stirred with a magnetic stirrer, the speed was mai...

Embodiment 2

[0095] This example is to illustrate the temperature-responsive high-temperature retarder prepared by the method of the present invention.

[0096] The high temperature retarder was prepared according to the same method as in Example 1, except that: 2-acrylamide-2-methylpropanesulfonic acid (monomer B) and acrylic acid (monomer A) were weighed according to the weight ratio. And hydrophobic monomer (monomer C).

[0097] Results The prepared high temperature retarder was marked as S2.

[0098] Among them, the structure of the high temperature retarder S2 is:

[0099] [CH 2 CM 1 H] x -[CM 2 HCH 2 ] y -[CH 2 CM 3 HCl - ] z ; Among them, M 1 For -COOH, M 2 For -CONHC(CH 3 ) 2 CH 2 SO 3 H, M 3 As-[NCH 2 (CH 3 ) 2 (CH 2 ) n CH 3 ] + ;

[0100] Wherein, x=39.45%, y=59.17%, z=1.38%; and

[0101] The weight average molecular weight of the high temperature retarder S2 is 150,000.

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Abstract

The invention belongs to the technical field of oil-gas well development and discloses a temperature-responsive high temperature retarder suitable for oil-gas well cementation, a preparation method thereof and a well cementing slurry. The temperature-responsive high temperature retarder comprises a structural unit A shown as the formula (I), a structural unit B shown as the formula (II) and a structural unit C shown as the formula (III), wherein structural percentages of the structural units A, B and C include x=37.2-57.23%, y=40.52-61.4% and z=1.38-4.35%; the addition of the temperature-responsive high temperature retarder can be adjusted according to cementation design so that thickening time of oil well cement meets the requirements of well cementing construction, and the temperature-responsive high temperature retarder helps effectively improve thickening performance of cement slurry and improve early strength of top set cement during well cementation.

Description

Technical field [0001] The invention relates to the technical field of oil and gas well development, in particular to a high-temperature retarder suitable for oil and gas well cementing, a preparation method of a high-temperature retarder suitable for oil and gas well cementing, and a solidification agent comprising the high-temperature retarder Well cement slurry. Background technique [0002] With the continuous increase in the demand for oil and gas resources in my country, the continuous reduction of conventional shallow oil and gas resources and the improvement of drilling technology, in order to increase crude oil production, future oil and gas exploration and development will gradually develop into deep wells, ultra-deep wells and complex formation wells. Under a certain geothermal gradient, with the increase of well depth, the bottom hole temperature also gradually rises. The higher temperature conditions at the bottom of the well make cementing operations in deep and ult...

Claims

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Application Information

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IPC IPC(8): C08F220/58C08F220/06C08F226/02C09K8/467
Inventor 王成文薛毓铖杨乐王瑞和郭辛阳
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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