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Temporary plugging diverting agent as well as preparation method and application thereof

A technology of diverting agent and dispersing agent, which is applied in chemical instruments and methods, earth-moving drilling, and fluid production, etc., and can solve problems such as unfavorable pump injection and easy bonding.

Active Publication Date: 2020-10-13
PUJING CHEM IND SHA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The temporary plugging agent has a certain rigidity, can form bridge plugging in the existing fractures, and can degrade by itself without causing secondary damage to the reservoir. Facilitates pump injection

Method used

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  • Temporary plugging diverting agent as well as preparation method and application thereof
  • Temporary plugging diverting agent as well as preparation method and application thereof
  • Temporary plugging diverting agent as well as preparation method and application thereof

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preparation example Construction

[0044] The present invention also provides a preparation method (10) of a foaming type degradable temporary blocking diversion agent, comprising the following steps:

[0045] Step i): At room temperature, placing at least two polyglycolic acids with different molecular weights in an autoclave, adding a dispersant, and then sealing the autoclave;

[0046] Step ii): Introducing low-pressure CO into the closed high-pressure reactor 2 To completely replace the air in the high-pressure reactor, then feed high-pressure CO 2 Until the pressure of the autoclave rises to the set value, the stirring is started, and then the heat source is used to gradually heat the autoclave until the CO in the autoclave 2 To reach the supercritical state, the polyglycolic acid with different molecular weights is fully mixed and dispersed into homogeneous and uniform particles under the action of the dispersant, and the pressure is maintained for a period of time to make the supercritical CO 2 Diffusi...

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Abstract

The invention discloses a temporary plugging diverting agent as well as a preparation method and application thereof. The temporary plugging diverting agent is prepared from the following raw materials: polyglycolic acid with a first weight-average molecular weight and polyglycolic acid with a second weight-average molecular weight, wherein the difference between the second weight-average molecular weight and the first weight-average molecular weight is not less than 10,000 and not greater than 290,000; the polyglycolic acid is a homopolymer of glycolic acid, and / or a copolymer taking glycolicacid as a main repeating unit. The temporary plugging diverting agent can be used for temporary plugging diversion fracturing of oil and gas wells.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field fracturing reconstruction, and relates to a foaming degradable temporary plugging diversion agent, a preparation method and application thereof. Background technique [0002] As we all know, oil and gas resources such as oil or natural gas are produced through the exploitation of wells (oil wells or gas wells, sometimes collectively referred to as "pit wells") containing porous and permeable underground layers. However, in recent years, with the continuous exploitation of oil and gas fields, the quality of reservoirs will decline year by year. For this reason, relevant oil and gas producers often use reservoir fracturing to improve the permeability of underground reservoirs, so as to continue to effectively remove these Exploitation of oil and gas resources in underground reservoirs. [0003] In the technical field of reservoir fracturing reconstruction, temporary plugging diversion fra...

Claims

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Application Information

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IPC IPC(8): C09K8/508E21B33/138E21B43/26
CPCC09K8/5086E21B33/138E21B43/26
Inventor 冯磊孙朝阳
Owner PUJING CHEM IND SHA
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