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Water-soluble fracturing temporary plugging agent and preparation method thereof

A water-soluble, temporary plugging agent technology, applied in the field of temporary plugging agents, which can solve the problem of difficulty in bridging and enriching the sealing and blocking layer at the same time, a single temporary plugging agent or a mixture of temporary plugging agents, and difficulty in forming a sealing and blocking layer, etc. To solve the problem, achieve the effect of temporary plugging and leakage prevention performance, improving the polymerization rate, stability and leakage prevention performance.

Pending Publication Date: 2022-08-09
余昭军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the above-mentioned existing technologies use a single temporary blocking agent or a mixture of temporary blocking agents to perform temporary blocking diversion
However, it has been found through experiments that when there is only one particle temporary plugging agent or fiber temporary plugging agent, it is difficult to play the role of bridging enrichment and forming a tight sealing layer at the same time
If only non-expandable particle temporary plugging agent is used, it is difficult to form a tight plugging layer; if only expandable particles are used, it is difficult to bridging and enriching because of its softness

Method used

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  • Water-soluble fracturing temporary plugging agent and preparation method thereof
  • Water-soluble fracturing temporary plugging agent and preparation method thereof
  • Water-soluble fracturing temporary plugging agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The present embodiment provides a preparation method of a water-soluble fracturing temporary plugging agent, which specifically includes the following steps:

[0042] Preparation of S1.P(AM-NVP-AMPS)@PLGA composite particles: 2 parts by weight of acrylamide, 1 part by weight of N-vinylpyrrolidone, 3 parts by weight of 2-acrylamido-2-methylpropanesulfonic acid and 30 parts by weight of PLGA was dissolved in water, adjusted the pH of the solution to 7, stirred and mixed evenly, heated to 50°C, and fed with N 2 , adding 10 parts by weight of an aqueous solution containing 0.01 parts by weight of an initiator, reacting for 5h, filtering, washing, drying, and pulverizing to obtain P(AM-NVP-AMPS)@PLGA composite particles; the initiator is sodium persulfate and sodium persulfate The compound mixture of sodium bisulfate, the mass ratio is 3:1;

[0043] S2. Preparation of polydopamine-modified P(AM-NVP-AMPS)@PLGA composite particles: add 100 parts by weight of the P(AM-NVP-AMPS...

Embodiment 2

[0047] The present embodiment provides a preparation method of a water-soluble fracturing temporary plugging agent, which specifically includes the following steps:

[0048] Preparation of S1.P(AM-NVP-AMPS)@PLGA composite particles: 5 parts by weight of acrylamide, 3 parts by weight of N-vinylpyrrolidone, 5 parts by weight of 2-acrylamido-2-methylpropanesulfonic acid and 30 parts by weight of PLGA was dissolved in water, adjusted the pH of the solution to 7.8, stirred and mixed evenly, heated to 70 ° C, passed Ar gas, added 10 parts by weight of an aqueous solution containing 0.1 part by weight of an initiator, reacted for 7 hours, filtered, washed, and dried , pulverized to obtain P(AM-NVP-AMPS)@PLGA composite particles; the initiator is a composite mixture of sodium persulfate and sodium bisulfite, and the mass ratio is 5:1;

[0049] S2. Preparation of polydopamine-modified P(AM-NVP-AMPS)@PLGA composite particles: add 100 parts by weight of the P(AM-NVP-AMPS)@PLGA composite ...

Embodiment 3

[0052] The present embodiment provides a preparation method of a water-soluble fracturing temporary plugging agent, which specifically includes the following steps:

[0053] Preparation of S1.P(AM-NVP-AMPS)@PLGA composite particles: 3.5 parts by weight of acrylamide, 2 parts by weight of N-vinylpyrrolidone, 4 parts by weight of 2-acrylamido-2-methylpropanesulfonic acid and 30 parts by weight of PLGA was dissolved in water, adjusted the pH of the solution to 7.4, stirred and mixed evenly, heated to 60°C, and fed with N 2 , adding 10 parts by weight of an aqueous solution containing 0.05 parts by weight of an initiator, reacting for 6 h, filtering, washing, drying, and pulverizing to obtain P(AM-NVP-AMPS)@PLGA composite particles; the initiator is sodium persulfate and sodium persulfate The compound mixture of sodium bisulfate, the mass ratio is 4:1;

[0054] S2. Preparation of polydopamine-modified P(AM-NVP-AMPS)@PLGA composite particles: add 100 parts by weight of the P(AM-NV...

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Abstract

The invention provides a water-soluble fracturing temporary plugging agent and a preparation method thereof, and belongs to the technical field of temporary plugging agents. The preparation method comprises the following steps: dissolving acrylamide, N-vinyl pyrrolidone, 2-acrylamido-2-methylpropanesulfonic acid and PLGA in water, polymerizing under the action of an initiator to obtain P (AM-NVP-AMPS) (at) PLGA composite particles, and further coating the surfaces of the composite particles with a polydopamine layer, so as to obtain the poly (acrylamide-NVP-AMPS) (at) PLGA composite particles. Dissolving the obtained polydopamine modified P (AM-NVP-AMPS) (at) PLGA composite particles, PVA resin, a nano modifier and a composite cross-linking agent in water to obtain a spinning solution, and carrying out electrostatic spinning and tensile shearing to obtain the water-soluble fracturing temporary plugging agent. The fibrous temporary plugging agent has better fracturing temporary plugging performance, can be completely dissolved in water or residual acid, and well protects a reservoir from being damaged.

Description

technical field [0001] The invention relates to the technical field of temporary plugging agents, in particular to a water-soluble fracturing temporary plugging agent and a preparation method thereof. Background technique [0002] Hydraulic fracturing technology has been widely used in the development of low-permeability oil and gas fields as the main measure for the production or stimulation of oil and gas wells, and has made important contributions to the high and stable production of oil and gas fields. With the development of fracturing technology and the transformation of fracturing ideas, in order to increase the controlled reserves of hydraulic fracturing and increase the drainage area of ​​oil and gas wells, steering fracturing technologies have been developed, such as initial fracturing fracture steering technology, and old well steering repetition. The purpose of fracturing technology, etc., is to extrude fractures in other directions without changing the existing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F8/10D01F8/16D01F1/10C08F283/02C08F220/56C08F226/10C08F220/58C09K8/512C09K8/504C09K8/68C09K8/66C09K8/88C09K8/84
CPCD01F8/10D01F8/16D01F1/10C08F283/02C09K8/512C09K8/5045C09K8/685C09K8/665C09K8/887C09K8/845C09K2208/10C08F220/56C08F226/10C08F220/585
Inventor 余昭军
Owner 余昭军
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