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

A self-adaptive technology for cementing slurry, which is applied in the preparation of high-temperature retarders and in the field of cementing slurry, to achieve high early strength, prolong thickening time, and increase retarding effect

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-adaptive high-temperature retarder suitable for oil and gas well cementing in order to overcome the defects of the high-temperature retarder in the prior art in terms of cement slurry settlement stability control and low-temperature strength development. A coagulant and its preparation method and cementing cement slurry. The high-temperature retarder can avoid the settlement problem caused by the poor stability of the cement slurry. At the same time, the early strength of the cement slurry is high at low temperature, and it can avoid the cementing of the upper part of the long sealing section. The problem of slow or even super retarded cement strength formation

Method used

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  • Adaptive-temperature high temperature retarder suitable for oil-gas well cementation, preparation method thereof and well cementing slurry
  • Adaptive-temperature high temperature retarder suitable for oil-gas well cementation, preparation method thereof and well cementing slurry
  • Adaptive-temperature 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, a rigid hydrophobic monomer is developed by increasing the length of the alkyl chain in the monomer, and the rigid hydrophobic monomer is a rigid hydrophobic long-chain alkyl monomer, which can endow the The thermal viscosity-increasing ability of synthetic polymers, so the present invention utilizes allyl chloride and N, N-dimethyl long-chain alkyl tertiary amines (the number of long-chain alkyls is an even number of 14-24) to synthesize a rigid hydrophobic long-chain The alkyl-containing quaternary ammonium salt type monomer is used as a rigid hydrophobic monomer, and the specific synthesis method includes the following steps:

[0047] (1) Add fatty alcohol and an appropriate amount of catalyst into the reactor, heat the reactor, and when the temperature is 130°C, feed monomethylamine into the reactor at a flow rate of 35kg / h-50kg / h for 75-85min, and finally the reactor Keep the reaction temperature at 180-200°C, and the reaction time is 5-7h...

Embodiment 1

[0084] This embodiment is to illustrate the temperature-adaptive high-temperature retarder prepared by the method of the present invention.

[0085] The preparation steps are as follows:

[0086] (1) Weigh 41.4 parts of 2-acrylamide-2-methylpropanesulfonic acid, 52 parts of itaconic acid, 4.95 parts of N,N-dimethylacrylamide, 6 parts of hydrophobic monomer, and use deionized water Dissolved, the total mass concentration of monomers in the solution is 35%, and the pH value is adjusted to 4 by a sodium hydroxide solution with a concentration of 5 mol / L;

[0087]Wherein, the rigid hydrophobic monomer has the structure shown in formula (IX), and, R 6 is H, n is 21;

[0088]

[0089] (2) Adjust the temperature of the water bath to 70° C., and install the reaction device, which includes three-necked flask, precision booster electric stirrer, constant pressure dropping funnel and other main components. Transfer the mixed solution of sodium styrene sulfonate, itaconic acid and h...

Embodiment 2

[0096] This embodiment is to illustrate the temperature-adaptive high-temperature retarder prepared by the method of the present invention.

[0097] The high-temperature retarder was prepared according to the same method as in Example 1, except that: 2-acrylamide-2-methylpropanesulfonic acid, itaconic acid, N,N-dimethyl Acrylamide and Hydrophobic Monomers.

[0098] As a result, the prepared high-temperature retarder is marked as S2.

[0099] Wherein, the structure contained in the high temperature retarder S2 is:

[0100] [CH 2 CHM 4 ] p -[M 1 CH 2 CHCH 2 m 1 ] q -[CM 2 HCH 2 ] m -[CH 2 CM 3 HCl - ] n ; among them, M 1 for-COOH, M 2 for-CONHC(CH 3 ) 2 CH 2 SO 3 H, M 3 for-[NCH 2 (CH 3 ) 2 (CH 2 ) n CH 3 ] + ,M 4 for-CON(CH 3 ) 2 ;

[0101] Wherein, p=9.59%, q=47.93%, m=40.26%, n=2.22%; and

[0102] The weight average molecular weight of the high temperature retarder S2 is 170,000.

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Abstract

The invention belongs to the technical field of oil-gas well development and discloses an adaptive-temperature high temperature retarder suitable for oil-gas well cementation, a preparation method thereof and a well cementing slurry. The adaptive-temperature high temperature retarder comprises a structural unit A shown as the formula (I), a structural unit B shown as the formula (II), a structuralunit C shown as the formula (III) and a structural unit D shown as the formula (IV), wherein structural percentages of the structural units A, B, C and D include p=7.18-10-76%, q=40.22-64.66%, m=25.86-46.25% and n=1.05-3.8%. The adaptive-temperature high temperature retarder helps prevent the settling problem due to poorer stability of a cement slurry; the slurry herein has high early strength ata low temperature, so that the problems can be avoided that cement strength of the upper portion of a long-cemented well forms slowly and even the setting speed is ultra-low.

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-gas well cementing, a preparation method for a high-temperature retarder suitable for oil-gas well cementing, and a solidification retarder comprising the high-temperature retarder. Well mud. Background technique [0002] With the continuous exploitation of conventional shallow oil and gas resources in my country, most domestic shallow oil and gas resources are approaching depletion one after another, and recoverable and easy-to-recover reserves are limited, making it increasingly difficult to increase and stabilize production. In order to increase crude oil production, future oil and gas exploration and development will gradually develop towards deep wells, ultra-deep wells, and complex formations. However, the outstanding difficulty in the cementing operation of deep and ultra-deep wells lies in the high formati...

Claims

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Application Information

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IPC IPC(8): C08F222/02C08F220/58C08F220/54C08F226/02C09K8/467
Inventor 王成文薛毓铖王瑞和王桓郭胜来
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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