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Plugging polymer latex for drilling fluid and preparation method thereof

A technology of polymer latex and drilling fluid, applied in drilling compositions, chemical instruments and methods, etc., can solve the problem of not being able to reduce pore pressure, not having temperature resistance and salt resistance, and not being able to block micro-pores, etc. problems, to achieve the effect of reducing differential pressure sticking, good temperature resistance and salt resistance, and reducing friction

Pending Publication Date: 2022-05-13
晋州市茂源钻采技术开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The deformable plugging polymer latex for drilling fluid has the following disadvantages: the existing deformable plugging polymer latex for drilling fluid cannot seal micropores and embed in microfractures; it cannot reduce pore pressure; Temperature and salt resistance; cannot effectively reduce friction, which is not conducive to reducing differential pressure sticking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] This embodiment provides a deformable plugging polymer latex for drilling fluid and its preparation method, including clear water, sodium hydroxide, acrylamide, oil, acrylamide, polyacrylate, epichlorohydrin and initiator. The clear water is 80 parts, 3 parts of sodium hydroxide, 20 parts of acrylamide, 50 parts of oil, 4.5 parts of polyacrylate, 5 parts of epichlorohydrin and 0.5 parts of initiator. The production method:

[0025] Step 1: Take 80 parts of clean water and put it into the mixing tank, the speed of the mixing tank is 12000r / min;

[0026] Step 2: Add 3 parts of sodium hydroxide to 80 parts of clear water and stir for 10 minutes; then add 20 parts of acrylamide and stir for 10 minutes; then add 50 parts of oil and stir for 30 minutes; then add 4.5 parts of poly Acrylate, stirred for 10 minutes; then added 5 parts of epichlorohydrin, stirred for 15 minutes, then added 0.5 parts of initiator, stirred for 5 minutes;

[0027] Step 3: Make the finished product ...

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PUM

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Abstract

The invention relates to the technical field of plugging agents for drilling fluid, and provides plugging polymer latex for drilling fluid and a preparation method of the plugging polymer latex. The latex provided by the invention is prepared from the following raw materials: 80 parts of clear water, 3 parts of sodium hydroxide, 20 parts of acrylamide, 50 parts of oil, 4.5 parts of polyacrylate, 5 parts of epoxy chloropropane and 0.5 part of an initiator. The polymer latex is an emulsion polymer prepared from an emulsifier, a polymer monomer, an initiator and the like through a polymerization reaction; in the drilling process, the small particles form a sealing film in a permeable or micro-fractured stratum and are adhered to a well wall under the action of pressure difference to gather into deformable micelles, and when drilling fluid begins to permeate into shale, the micelles are spread on the shale to form a low-permeability sealing film at a pore throat, so that the drilling fluid is prevented from permeating, and the filter loss of the drilling fluid is effectively reduced.

Description

[0001] This application is a divisional application with an application date of March 29, 2018, an application number of 201810262939.3, and an invention title of "Formulation and Preparation Method of Deformable Plugging Polymer Latex for Drilling Fluid". technical field [0002] The invention relates to the technical field of plugging agents for drilling fluids, in particular to a plugging polymer latex for drilling fluids and a preparation method thereof. Background technique [0003] Drilling fluid has multiple functions and is a general term for various circulating fluids that meet the needs of drilling work during the drilling process. Drilling fluid is the blood of drilling, also known as drilling flushing fluid. Drilling fluid can be divided into clear water, mud, clay-free flushing fluid, emulsion (such as deformable plugging polymer latex), foam and compressed air according to its composition. Clear water is the earliest drilling fluid, it does not need to be trea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/512C08F265/04C08F220/56C08G59/44
CPCC09K8/035C09K8/512C08F265/04C08G59/44C09K2208/28C08F220/56
Inventor 张达明孙黎孙保勇
Owner 晋州市茂源钻采技术开发有限公司