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Nano-micron self-soluble temporary plugging steering agent for acidification

A diverting agent, nano-micron technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as permanent blockage of formations, residues of viscosifier polymers, damage to formation permeability that is difficult to recover, etc., to achieve The effect of formation permeability recovery, simple preparation method and good plugging performance

Inactive Publication Date: 2018-04-10
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these two methods have certain limitations: chemical particle diversion technology, whether it is oil-soluble resin or water-soluble resin, although it can form a filter cake on the wall of the wellbore or fracture and then block the high-permeability area to achieve the purpose of diverting acid fluid. purpose, but the particles of this type of organic resin are very sensitive to natural fractures in the formation, which mainly form filter cakes on the fracture walls so that they cannot reach deeper layers
Second, most organic resin diverting agents are obtained through chemical cross-linking of high molecular polymers. If the flowback is not thorough, there will be residues, which will easily damage the formation, and even cause permanent blockage of the formation, causing irreversible damage to the permeability of the formation. Not reaching the purpose of acidification to increase production
Viscosification diversion diversion technology, the viscosifier, especially the polymer residue is serious, easy to cause secondary damage to the reservoir

Method used

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  • Nano-micron self-soluble temporary plugging steering agent for acidification
  • Nano-micron self-soluble temporary plugging steering agent for acidification
  • Nano-micron self-soluble temporary plugging steering agent for acidification

Examples

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preparation example Construction

[0027] The preparation method of the present invention can be carried out according to the following steps:

[0028] At room temperature, measure 25.0-35.0mL of water and add 0.5-1.5g of iron ion stabilizer, clay stabilizer, drainage aid and high-temperature corrosion inhibitor into it respectively and stir to obtain the mixed solution I;

[0029] Continue to add 0.05-0.15g of dispersant to the mixed solution I and stir, then add 0.1-0.3g of suspending agent and 7.0-20.0g of sodium chloride and stir for 3-10min to obtain mixed solution II;

[0030] Measure 35.0-50.0 mL of concentrated hydrochloric acid, slowly add it into the mixed solution II and keep stirring for 10-30 min to obtain a suspension with precipitated sodium chloride particles.

Embodiment

[0032] This embodiment provides 1-4 examples of soluble salt particles self-turning temporary plugging diversion acidification fluid, which is prepared by the following steps:

[0033] At room temperature, add water first, then add iron ion stabilizer, clay stabilizer, drainage aid, high temperature corrosion inhibitor and stir, then add dispersant, suspending agent and sodium chloride in sequence, and stir for 3 to 10 minutes. When it is completely dissolved, measure concentrated hydrochloric acid and add it for 10-30 minutes while stirring to obtain a suspension with precipitated sodium chloride particles. Wherein, the amount of sodium chloride, concentrated hydrochloric acid and various additives is shown in Table 1 below.

[0034] Table 1 1 to 4 cases of sodium chloride, concentrated hydrochloric acid and the dosage of various additives

[0035] substance

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Abstract

The invention discloses a nano-micron self-soluble temporary plugging steering agent for acidification; the steering agent comprises the following components in parts: 0.5-1.5 parts by mass of an ironion stabilizer, 0.5-1.5 parts by mass of a clay stabilizer, 0.5-1.5 parts by mass of a discharge assisting agent, 0.5-1.5 parts by mass of a high temperature corrosion inhibitor, 0.05-0.15 part by mass of a dispersant, 0.1-0.3 part by mass of a suspending agent, 30-50 parts by volume of concentrated hydrochloric acid, 7-20 parts by mass of sodium chloride and 25-30 parts by mass of water. The formed steering agent is a sodium chloride particle substance with the particle size of less than 3 [mu]m, can enter a deep part of a reservoir and temporarily plug a high-permeability layer and net seams; along with the end of acidification construction, the sodium chloride particles playing the temporary plugging effect are dissolved in less than 10% of an acid residual liquid or formation water and plugging is removed. The steering agent does not contain organic polymer compounds, has the characteristics of no need of glue crosslinking, no need of glue breaking, self plugging removal, little damage to formation, simple preparation method, low cost and the like.

Description

technical field [0001] The invention relates to the field of oil and gas field development, in particular to a temporary plugging diversion self-dissolving diversion agent, in particular to an autodissolvable temporary plugging diversion agent containing nano-micron sodium chloride particles. Background technique [0002] Acidizing and acid fracturing is one of the commonly used stimulation measures for low-permeability reservoirs in the exploration and development of oil and gas fields. Through the contact reaction between the acid liquid and the formation rock, acid corrosion holes are generated, which makes the formation oil and gas flow out more easily, and achieves the purpose of increasing production capacity. However, the acid liquid follows the principle of natural selection during acidification, that is, it preferentially enters the high-permeability area of ​​the reservoir, and it is difficult to effectively transform the low-permeability of the reservoir, which af...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/506
CPCC09K8/506C09K2208/10
Inventor 陈清孙海林白田增杨旭徐克彬穆海林杨永夏克文王中泽柯强王航周涛余芳车莹向荣刘爱民陈天昊徐昊洋杜鑫芳刘飞
Owner CNPC BOHAI DRILLING ENG
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