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Resin type nanoparticle latex blocking agent for drilling fluids and preparation method of blocking agent

A nanoparticle and resin technology is applied in the field of resin nanoparticle latex plugging agent for drilling fluids, which can solve the problem of high cost and achieve the effects of high plugging rate, improving plugging ability and reducing filtration loss.

Active Publication Date: 2016-04-06
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 2. Higher cost

Method used

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  • Resin type nanoparticle latex blocking agent for drilling fluids and preparation method of blocking agent
  • Resin type nanoparticle latex blocking agent for drilling fluids and preparation method of blocking agent

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Effect test

Embodiment 1

[0031] As the best embodiment of the present invention, it discloses a kind of resin nano particle latex plugging agent for drilling fluid, which is composed of the following raw materials in parts by weight:

[0032] Alkenylbenzene: 20;

[0033] Acrylate: 15;

[0034] acrylic: 1;

[0035] Hard Inorganic Materials: 10;

[0036] The mass ratio of long-chain monomers to short-chain monomers in the acrylate monomers is 3:1.

[0037] The alkenyl benzene monomer is one of styrene, propylene toluene and vinyl toluene.

[0038] The acrylic monomer is methyl methacrylate, butyl acrylate, lauryl methacrylate, two or more mixtures in any proportion of stearyl methacrylate, wherein the long-chain monomer is specifically ( Lauryl methacrylate, octadecyl methacrylate), short-chain monomers specifically (methyl methacrylate, butyl acrylate).

Embodiment 2

[0040] As the best implementation mode of this preparation method, its steps are as follows:

[0041] 1) Add 10g of alkylphenol polyoxyethylene ether ammonium sulfate to 200ml of distilled water, add 40g of alkenylbenzene, 30g of acrylate, 2g of acrylic acid, and 20g of hard inorganic material in sequence, and use a shear emulsifier to cut for 30 minutes to form a pre- lotion;

[0042] 2), adding a 15% sodium bicarbonate aqueous solution to the pre-emulsion, stirring at a constant speed, adjusting the pH of the pre-emulsion to be weakly alkaline, and the pH range is 7-8;

[0043] 3) Stir at a constant speed, slowly add 2% saturated solution of initiator ammonium persulfate dropwise, finish adding in 30 minutes, raise the temperature to 70°C-85°C, and keep warm for 4h;

[0044] 4) After cooling the reactant to 30°C-40°C, add 5% ammonia solution, adjust the pH value of the reactant to be weakly alkaline, and the pH range is 7-8, and stir for 10 minutes to obtain resin nanoparti...

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PUM

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Abstract

The invention discloses a resin type nanoparticle latex blocking agent for drilling fluids. The blocking agent comprises raw materials in parts by weight as follows: 20 parts of alkenyl benzene, 15 parts of acrylate, 1 part of acrylates and 10 parts of hard inorganic materials, wherein the mass ratio of short-chain monomers to long-chain monomers in acrylate monomers is 3:1. The blocking agent is a composite product of the inorganic materials and organic materials, combines the hard materials with soft materials, has a higher blocking rate and is wide in particle size distribution and wider in application range; the rheological property of the drilling fluids are seldom influenced after the blocking agent is added to the drilling fluids, the blocking capacity of the drilling fluids can be remarkably improved, and the filter loss of the drilling fluids is reduced.

Description

technical field [0001] The invention relates to the technical field of oil and gas drilling, in particular to a resin nano particle latex plugging agent for drilling fluid and a preparation method of the plugging agent. Background technique [0002] The use of plugging agents with various particle size distributions in the drilling fluid and their respective plugging mechanisms can enhance the plugging effect of the drilling fluid on micro-fractures in different formations, thereby reducing fluid loss and maintaining wellbore stability Purpose. At present, commonly used drilling fluid plugging agents mainly include superfine calcium carbonate, humic acid, asphalt and other treatment agents. Among them, the superfine calcium carbonate plugging agent is a rigid plugging agent. During the plugging process, due to its incompressibility, it is easy to occur in the micro-fractures of the formation under the joint action of the drilling fluid column pressure and the drilling fluid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C08F212/08C08F220/06C08F220/18C08F220/14
CPCC08F212/08C09K8/03C08F220/06C08F220/18
Inventor 万伟马光长黄平何涛彭碧强肖沣峰
Owner BC P INC CHINA NAT PETROLEUM CORP
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