Temperature-resistant and salt-resistant latex blocking agent and preparation method thereof

A technology of temperature and salt resistance and plugging agent, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of insufficient temperature and salt resistance of plugging agents, decreased performance and stability of drilling fluid, and plugging Unsatisfactory effect and other problems, to achieve good plugging and reduce water loss, improve salt resistance and temperature resistance, and good temperature resistance

Active Publication Date: 2016-08-24
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical application, it is found that the temperature and salt resistance of this type of plugging agent is insufficient, and complex formation conditions with high temperature and high salinity are easy to accumulate and settle, resulting in a decrease in the performance and stability of drilling fluid, and the plugging effect is not ideal

Method used

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  • Temperature-resistant and salt-resistant latex blocking agent and preparation method thereof
  • Temperature-resistant and salt-resistant latex blocking agent and preparation method thereof
  • Temperature-resistant and salt-resistant latex blocking agent and preparation method thereof

Examples

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preparation example Construction

[0052] The application also provides a method for preparing a temperature-resistant and salt-resistant latex plugging agent, the method comprising:

[0053] Mix and stir 10-100 parts by weight of hydrophobic monomer, 0-20 parts by weight of hydrophilic monomer, 0.05-5 parts by weight of emulsifier and 20.1-50.6 parts by weight of deionized water to prepare a first mixed solution;

[0054] mixing the remaining parts by weight of the hydrophobic monomer, the remaining part by weight of the hydrophilic monomer, 0.03-3 parts by weight of an emulsifier and 11.4-50.2 parts by weight of deionized water and stirring at a high speed to form a second mixed solution;

[0055] Mixing 3.4 to 8.6 parts by weight of deionized water and all initiators to prepare a third mixed solution;

[0056] Add buffer, molecular weight modifier, protective agent, remaining deionized water and emulsifier into the reactor and mix well. The temperature of the reactor is raised to 75° C., under an inert atmo...

Embodiment 1

[0071] Add the following raw materials into a 250ml beaker: styrene 40g, methyl methacrylate 30g, butyl acrylate 30g, deionized water 35.6g, fatty alcohol oxyethylene ether sulfosuccinate sodium salt 0.75g, alkyl glycoside 0.55g , high-speed stirring to obtain the first mixed solution;

[0072] Add the following raw materials into a 50ml beaker: 2g of acrylamide, 3g of N-vinylpyrrolidone, 5g of sodium vinylsulfonate, 0.25g of sodium salt of fatty alcohol oxyethylene ether sulfosuccinate, 20.1g of deionized water, and Stir to obtain the second mixed solution;

[0073] Add the following raw materials into a 10ml beaker: 5g of deionized water, 0.6g of ammonium persulfate, and stir well to obtain the third mixed solution;

[0074] Add the following raw materials into a 250ml stirred three-port reactor: 15g of deionized water, 0.3g of alkyl glucoside, 0.5g of sodium bicarbonate, 0.1g of dodecyl mercaptan, 0.13g of polyvinyl alcohol, mix and stir evenly, and heat up To 75°C, add t...

Embodiment 2

[0082] Add the following raw materials into a 100ml beaker: 70g methyl methacrylate, 5g ethyl methacrylate, 5g butyl methacrylate, 1g acrylic acid, 0.15g fatty alcohol alkyloxyethylene ether phosphate, isomerized alcohol polyoxyethylene Ether 0.12g, deionized water 69g, high-speed stirring to obtain the first mixed solution;

[0083]Add the following raw materials to a 200ml beaker: 10g methyl methacrylate, 5g ethyl methacrylate, 5g butyl methacrylate, 5g 2-acrylamide-2-methylpropanesulfonic acid, 22g deionized water, Fatty alcohol alkyloxyethylene ether phosphate 0.3g, isomerized alcohol polyoxyethylene ether 0.5g, high-speed stirring to obtain the second mixed solution;

[0084] Add the following raw materials into a 50ml beaker: 8.5g of deionized water, 1.2g of ammonium persulfate, and stir well to obtain the third mixed solution;

[0085] Add the following raw materials into a 250ml stirred three-port reactor: 5.2g sodium bicarbonate, 6.4g polyvinylpyrrolidone, 4.2g tert-...

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Abstract

The invention provides a temperature-resistant and salt-resistant latex blocking agent. The latex blocking agent is prepared from, by weight, 100 parts of hydrophobic monomers, 0.5-25 parts of hydrophilic monomers, 0.1-10 parts of emulgator, 0.01-5.5 parts of a buffer agent, 0.01-4.5 parts of molecular weight modifier, 0.01-6.9 parts of a protective agent, 0.01-2.3 parts of initiator and 67-172 parts of deionized water. The latex blocking agent has good blocking and water loss reduction effects and is resistant to high pressure and high temperature, and a formed mud cake is dense, thin and tough.

Description

technical field [0001] This application relates to but is not limited to a temperature-resistant and salt-resistant latex plugging agent and a preparation method thereof. Background technique [0002] During the drilling process, the instability of shale wellbore is a main topic in the study of wellbore stability. There are a large number of micropores with nanoscale pores in the shale formation. Under the action of pressure difference, the liquid phase in the drilling fluid enters the formation through these micropores, which increases the pore pressure of the sandstone lens and the hydration effect of the shale. Factors such as drilling can easily cause drilling to collapse and lead to complex drilling accidents. Therefore, adding a plugging agent to the drilling fluid to effectively seal the micropores of shale can effectively reduce or even eliminate the loss of drilling fluid in the shale formation, and then reduce or even eliminate the drilling accidents caused by it....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F220/14C08F220/18C08F220/56C08F226/10C08F228/02C08F220/06C08F220/58C08F220/54C08F2/24C09K8/508
CPCC09K8/5083C08F2/24C08F212/08C08F220/14C08F220/1818C08F220/585C08F220/54C08F220/1804C08F220/06C08F220/18C08F220/1808C08F228/02C08F220/56C08F226/10
Inventor 李文波张伟刘卫丽夏小春项涛
Owner CHINA NAT OFFSHORE OIL CORP
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