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

A technology for cementing cement slurry and retarder, which is used in the preparation of high-temperature retarder and in the field of cementing cement to achieve strong retardation, control high-temperature thickening time, and prolong thickening time.

CN109824823BActive Publication Date: 2021-03-09CHINA UNIV OF PETROLEUM (EAST CHINA)
3 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-03-09

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention belongs to the technical field of oil and gas well development, and discloses a temperature self-adaptive high-temperature retarder suitable for oil and gas well cementing, a preparation method thereof and well cementing cement slurry. This high-temperature retarder contains structural unit A shown in (I), structural unit B shown in (II), structural unit C shown in (III) and structural unit D shown in formula (IV); wherein, structural unit A, The structure percentages of B, C and D p=7.18‑10.76%, q=40.22‑64.66%, m=25.86‑46.25%, n=1.05‑3.8%; this high temperature retarder can avoid the deterioration of the stability of cement slurry At the same time, the early strength of the cement slurry is high at low temperature, which can avoid the problem of slow or even super retarded cement strength formation in the upper part of the long sealing section;
Need to check novelty before this filing date? Find Prior Art

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...

Examples

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 thickening ability of synthetic polymer, so the present invention utilizes allyl chloride and N, N-dimethyl long-chain alkyl tertiary amine (long-chain alkyl number is the even number of 14-24) to synthesize a kind of 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, so as to ...

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.