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High-strength soluble nanoscale particle temporary plugging agent

A soluble, nano-scale technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as insufficient strength, inability to effectively seal small pore fractures, proppant regurgitation, etc.

Inactive Publication Date: 2017-07-21
CNPC BOHAI DRILLING ENG
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  • Claims
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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. Temporary plugging agent

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  • High-strength soluble nanoscale particle temporary plugging agent
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  • High-strength soluble nanoscale particle temporary plugging agent

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Embodiment Construction

[0041] 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.

[0042] A high-strength soluble nano-particle temporary plugging agent for fracturing, the selected specific materials and dosage of its dispersant, the dosage of sodium chloride, xanthan gum and calcium chloride, and the specific stirring speed of high-speed stirring are shown in Table 1 below Show.

[0043] Table 1:

[0044]

[0045] The specific preparation method of the temporary plugging agent is as follows: at room temperature, measure 100mL deionized water and add it to the beaker, add the dispersant to the beaker, stir for 30 minutes until completely dissolved, then add sodium chloride and xanthan gum, and stir for 40 minutes , so that the two are completely dissolved in water; then add calcium chloride to the beaker and stir at a high speed for 1 hour to obtain a temporary blocking agent in a...

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Abstract

The invention discloses a high-strength soluble nanoscale particle temporary plugging agent. The high-strength soluble nanoscale particle temporary plugging agent comprises, by weight, 18-30 parts of sodium chloride, 0.05-1.5 parts of dispersing agent, 0.2-0.6 part of tackifier, 10-25g of solid calcium chloride and 80-120 parts of solvent water. The high-strength soluble nanoscale particle temporary plugging agent is prepared by adding the solid calcium chloride into a mixed solution dissolved with the dispersing agent, the sodium chloride and the tackifier and performing high-speed stirring. The high-strength soluble nanoscale particle temporary plugging agent has the advantages that the temporary plugging agent uses nanoscale NaCl crystals in normal distribution in the particle size range of 0.25-22.81 micrometers as the main constraint to form an organic whole in a spatial network structure formed in natural polymer and an aqueous solution, and the temporary plugging agent is good in dispersity, good in plugging effect, suitable for making cracks and micro-seams, and the like.

Description

technical field [0001] The invention relates to the technical field of oil field chemistry, in particular to 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 a shielding bridging pl...

Claims

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Application Information

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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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