Preparation method of high-strength soluble nano-scale particle temporary plugging agent for fracturing

A soluble, nano-scale technology, used in chemical instruments and methods, drilling compositions, etc., can solve problems such as insufficient strength, proppant back-spitting, and inability to effectively plug small pores and cracks, and achieve good dispersion and sealing. good blocking effect

Inactive Publication Date: 2017-06-30
CNPC BOHAI DRILLING ENG
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Problems solved by technology

[0008] The purpose of the present invention is to provide a high-strength soluble nano-scale particle for fracturing that solves the problems that the existing fracturing temporary plugging agent cannot effectively plug small pores and cracks due to insufficient strength and easy proppant regurgitation. Preparation method of temporary plugging agent

Method used

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  • Preparation method of high-strength soluble nano-scale particle temporary plugging agent for fracturing
  • Preparation method of high-strength soluble nano-scale particle temporary plugging agent for fracturing
  • Preparation method of high-strength soluble nano-scale particle temporary plugging agent for fracturing

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Embodiment Construction

[0046] The present invention will be further described below in conjunction with specific examples, but the following examples do not limit the present invention in any way.

[0047] A method for preparing a high-strength soluble nano-particle temporary plugging agent for fracturing, the steps are as follows:

[0048] At room temperature, measure 100mL of deionized water into the beaker, add dispersant to the beaker, stir for 30 minutes until completely dissolved, then add sodium chloride and xanthan gum, stir for 40 minutes, so that the two are completely dissolved in water; Add calcium chloride into the beaker and adjust the rotation speed of the stirrer to stir the mixture at a high speed for 1 hour to obtain the temporary blocking agent in the state of suspension.

[0049] Among them, the specific substance and amount of dispersant, the amount of sodium chloride, xanthan gum and calcium chloride, and the specific stirring rate of high-speed stirring are shown in Table 1 be...

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Abstract

The invention discloses a preparation method of a high-strength soluble nano-scale particle temporary plugging agent for fracturing, wherein the preparation method comprises the concrete steps of adding a calcium chloride solid into a mixed solution dissolved with a dispersant, sodium chloride and a tackifier and carrying out high-speed stirring for 0.1-1.0 h, wherein sodium chloride in the mixed solution is close to saturation, and the speed of the high-speed stirring is 200-1000 rpm. The preparation method of the temporary plugging agent is simple and easy to operate; the dispersant and xanthan gum are added to a sodium chloride solution close to the saturation and are compounded with finally added calcium chloride to prepare the temporary plugging agent; nanoscale NaCl crystals showing normal distribution in a certain range of particle size and used as a main body are bound in a space network structure formed by natural macromolecules in an aqueous solution to form an organic whole, so that the temporary plugging agent has the advantages of good dispersion and good plugging effect, and is suitable for small seams, micro seams and the like.

Description

technical field [0001] The invention relates to the technical field of oil field chemistry, in particular to a preparation method of a high-strength soluble nano-scale particle temporary plugging agent for fracturing. Background technique [0002] Fracturing is still a production stimulation measure widely used in oilfields at home and abroad. Due to the difference in heterogeneity of reservoirs, the stimulation of reservoirs is not sufficient, especially in the middle and late stages of oil reservoir development, fractures tend to follow the old fractures of repeated fracturing. In order to avoid this phenomenon, temporary plugging and diversion technology is usually adopted. According to the principle of minimum flow resistance, fracturing fluid and its sand-carrying fluid will preferentially enter high-permeability layers or newly created fractures with less flow resistance. After that, with the entry of the temporary plugging agent, the temporary plugging agent will form...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/514
CPCC09K8/514
Inventor 陈清白田增徐克彬王中泽仪忠建柯强王航赵琦周志强杨志英王长恩白文剑候朝晖陈天昊曾子轩徐昊洋杜鑫芳刘飞
Owner CNPC BOHAI DRILLING ENG
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