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Acid controllable rigid temporary plugging agent and preparation method thereof

A temporary plugging agent and rigid technology, applied in the field of rigid temporary plugging agent and its preparation, can solve the problems of poor plugging strength, slow degradation speed, and difficult crushing, etc., and achieve the improvement of temporary plugging agent strength, degradation rate, and degradation fast speed effect

Active Publication Date: 2020-01-10
FIVE STAR DOWNHOLE SERVICE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the structure formed by the expansion temporary plugging agent is soft, it is difficult to bridge and enrich when used alone, and the plugging strength is poor
Chinese patent document CN201610584258 discloses a technology for combining rigid temporary plugging agent and water-soluble self-expanding temporary plugging agent for fracturing. However, among the rigid temporary plugging agents used in this technology, conventional rigid temporary plugging agents such as polylactic acid are difficult to pulverize and require low-temperature crushing with liquid nitrogen to obtain polylactic acid fine powder. However, rigid temporary plugging agents such as soluble acrylic resin and gelatin have defects such as single dissolution rate, large price fluctuation, low strength, poor heat resistance, and inability to release large amounts of organic acids; there are also some insoluble temporary plugging agents. The plugging agent must be discharged through the reverse discharge procedure, which greatly increases the difficulty of construction

Method used

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  • Acid controllable rigid temporary plugging agent and preparation method thereof
  • Acid controllable rigid temporary plugging agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033]The rigid temporary plugging agent with controllable acidity described in this embodiment is composed of a resin matrix and an auxiliary agent as a raw material, and the resin matrix is ​​composed of the following components in parts by mass: 50 parts of polylactic acid and 50 parts of polyglycolic acid; the auxiliary agent consists of the following Composition in parts by mass: 1 part of tetrabutyl titanate, 1 part of triphenyl phosphate, and 1 part of phenyl p-toluenesulfonate.

[0034] The method for preparing acidic controllable rigid temporary plugging agent described in this embodiment comprises the following steps:

[0035] S1. Weigh 50 parts of polylactic acid, 50 parts of polyglycolic acid and 1 part of tetrabutyl titanate, mix them in a high-speed mixer for 5 minutes, and then extrude and granulate them in a twin-screw extruder at 190-270°C to obtain the pre- mixed particles;

[0036] S2. Mix the pre-mixed granules obtained in step S1 with 1 part of triphenyl ...

Embodiment 2

[0038] The rigid temporary plugging agent with controllable acidity described in this embodiment, the raw material is composed of resin matrix and auxiliary agent, and the resin matrix is ​​composed of the following components in parts by mass: 90 parts of polylactic acid, 10 parts of polyglycolic acid; the auxiliary agent consists of the following Composition in parts by mass: 4 parts of tetraisopropyl titanate, 100 parts of calcium carbonate, 5 parts of triphenyl phosphate, and 8 parts of diethyl p-oxalate.

[0039] The method for preparing acidic controllable rigid temporary plugging agent described in this embodiment comprises the following steps:

[0040] S1. Weigh 90 parts of polylactic acid, 10 parts of polyglycolic acid and 4 parts of tetraisopropyl titanate, mix them in a high-speed mixer for 5 minutes, and then extrude and granulate them in a twin-screw extruder at 190-270°C to obtain premixed granules;

[0041] S2. Mix the premixed granules obtained in step S1 with...

Embodiment 3

[0043] The rigid temporary plugging agent with controllable acidity described in this embodiment is made of a resin matrix and auxiliary agents as raw materials, and the resin matrix is ​​composed of the following components in parts by mass: 70 parts of polylactic acid and 30 parts of polyglycolic acid; the auxiliary agent consists of the following The composition of parts by mass: 2 parts of tetraisopropyl titanate, 2 parts of tetrabutyl titanate, 50 parts of hydrotalcite, 5 parts of triphenyl phosphate, 8 parts of diethyl p-oxalate, 2 parts of dimethyl oxalate .

[0044] The method for preparing acidic controllable rigid temporary plugging agent described in this embodiment comprises the following steps:

[0045] S1. Weigh 70 parts of polylactic acid, 30 parts of polyglycolic acid, 2 parts of tetraisopropyl titanate, and 2 parts of tetrabutyl titanate, mix them in a high-speed mixer for 5 minutes, and then mix them in a twin-screw extruder at 190~ Extrude and granulate at ...

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Abstract

The invention provides an acid controllable rigid temporary plugging agent and a preparation method thereof. The raw materials of the acid controllable rigid temporary plugging agent comprise a resinmatrix, wherein the resin matrix comprises polylactic acid and polyglycolic acid with a mass ratio of (1-9): 1. The preparation method of the acid controllable rigid temporary plugging agent comprisesthe following steps: mixing the raw materials of the rigid temporary plugging agent, then melting, blending and granulating at 160-270 DEG C to obtain the acid controllable rigid temporary plugging agent. The acidic controllable rigid temporary plugging agent has high plugging strength, easy crushing, controllable dissolution speed and controllable acid release amount.

Description

technical field [0001] The invention belongs to the technical field of materials for oil and gas development, and in particular relates to a rigid temporary plugging agent with controllable acidity and a preparation method thereof. Background technique [0002] In every link in the process of oil drilling and development, oil and gas layers will be damaged or polluted to varying degrees. The shielding temporary plugging technology, which uses temporary plugging agent to temporarily plug oil and gas layers, is one of the important measures to avoid damage to oil and gas layers by fluid entering the well. At present, the temporary plugging agents used in oilfield or gas field fracturing mainly include water-soluble granular temporary plugging agents and fiber-type temporary plugging agents, and water-soluble granular temporary plugging agents include expansion-type temporary plugging agents and rigid temporary plugging agents (non-expandable temporary plugging agents) , mainl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/508
CPCC09K8/5045C09K8/5086
Inventor 胡毅
Owner FIVE STAR DOWNHOLE SERVICE INC
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