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Styrene-acrylic latex for oil field cementing and its preparation and application

A styrene-acrylic latex and cementing technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as strong sensitivity, difficult on-site adjustment, and complex synthesis conditions

Active Publication Date: 2019-06-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing styrene-butadiene latex cement slurry system has problems such as complex synthesis conditions, difficult control, strong sensitivity, and very difficult on-site adjustment

Method used

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  • Styrene-acrylic latex for oil field cementing and its preparation and application
  • Styrene-acrylic latex for oil field cementing and its preparation and application
  • Styrene-acrylic latex for oil field cementing and its preparation and application

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preparation example Construction

[0048] The second aspect of the present invention relates to a kind of preparation method of styrene-acrylic latex as described in the first aspect of the present invention, comprising:

[0049] Step A, mixing at least one of components a, b, d, g and h and optional components c, e and f with water, and then emulsifying by a shear emulsification pump to prepare a monomer pre-emulsion ;

[0050] Step B, mixing the initiator with water to prepare an initiator solution;

[0051] Step C, reacting 5%-10% (mass) monomer pre-emulsion with 5%-10% (mass) initiator solution to prepare emulsion seeds;

[0052] Step D, adding dropwise the remaining monomer pre-emulsion and the remaining initiator solution to the emulsion seed to react to prepare a reaction mixture;

[0053] In step E, add a redox initiator dropwise to the reaction mixture, and then add a pH regulator after the dropwise addition is completed, to obtain styrene-acrylic latex.

[0054] The term "water" used in the present...

Embodiment 1

[0085] Add 900kg deionized water, 20kg alkylphenol polyoxyethylene (10) ether, 500kg styrene, 800kg butyl acrylate, 12kg divinylbenzene, 60kg acrylamide, 50kg AMPS in the stirred reactor (raw material tank) (2-acrylamide-2-methylpropanesulfonic acid), pre-emulsified for half an hour for later use. Add sodium persulfate 11kg in another raw material dropping tank simultaneously, deionized water 1100kg, drop components as initiator.

[0086] Put 700kg of deionized water into the reactor, raise the temperature to 90°C, add 5% of the above-mentioned pre-emulsion, 10% of the above-mentioned initiator solution, and after 20 to 30 minutes of reaction, start to drop the remaining pre-emulsion and initiator solution at the same time , the dropping process continued for 4 hours. After dripping, keep warm for 30 minutes, lower the temperature to 85°C, add dropwise solution A consisting of 4.2kg tert-butyl hydroperoxide and 200kg water, solution B consisting of 2.5kg sodium thiosulfate an...

Embodiment 2

[0088] Add 900kg deionized water in the reactor (raw material tank) with stirring, 30kg myristylphenol polyether sulfosuccinic acid monoester sodium salt, 20kg alkylphenol polyoxyethylene (10) ether, 700kg styrene, 600kg butyl acrylate, 60kg acrylamide, pre-emulsified for half an hour for use. Add 11kg of sodium persulfate and 1100kg of deionized water in the raw material dropping tank at the same time, and add components dropwise as the initiator.

[0089]Put 700kg of deionized water into the reactor, raise the temperature to 90°C, add 5% of the above-mentioned pre-emulsion, 10% of the above-mentioned initiator solution, and after 20 to 30 minutes of reaction, start to drop the remaining pre-emulsion and initiator solution at the same time , the dropping process continued for 4 hours. After dripping, keep warm for 30 minutes, lower the temperature to 85°C, add dropwise solution A consisting of 4.2kg tert-butyl hydroperoxide and 200kg water, solution B consisting of 2.5kg sod...

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Abstract

The invention relates to styrene-acrylic latex used for oil field well cementation and a preparing method thereof. The styrene-acrylic latex is prepared by subjecting styrene, an acrylate compound, another functional water-soluble monomer and an optional water soluble monomer having a sulfonic acid functional group to emulsion polymerization under functions of an emulsifier, an initiator and an optional chain transfer and / or a crosslinking agent. The invention also relates to application of the styrene-acrylic latex in oil field well cementation. Through adding the styrene-acrylic latex into a cement paste system used for well cementation, the filter loss of the cement paste can be effectively reduced, API water loss at high temperatures is controlled to be 50 mL or below, compactness of oil well cement is enhanced, set cement permeability is reduced, oil, gas and water channeling in well sealing and cementation segments is effectively prevented, physical performance of set cement is improved and oil cementation quality of oil gas wells is improved.

Description

technical field [0001] The invention belongs to the technical field of oil field cementing, and in particular relates to a styrene-acrylic latex for oil field cementing and its preparation and application. Background technique [0002] As the exploration of oil and gas resources in my country continues to expand to areas with deep complex geological structures, the cementing of deep and ultra-deep wells is facing the problem of high temperature and high pressure to prevent gas channeling. The latex cement slurry added with latex admixture has the characteristics of high temperature resistance, oil and gas water channeling prevention, water loss reduction and protection of oil and gas layers, and can effectively improve the cementing quality of deep wells and ultra-deep wells. cement slurry system. [0003] At present, most of the latex cement slurry used in oil field cementing operations is styrene-butadiene latex cement slurry system, and the application of styrene-acrylic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/18C08F212/08C08F212/36C08F220/56C08F220/58C08F2/30C08F2/26C09K8/493C09K8/467
Inventor 王其春孔祥明曾敏汪晓静刘伟徐春虎
Owner CHINA PETROLEUM & CHEM CORP
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