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A kind of temporary plugging material and preparation method thereof

A material, polyethylene glycol technology, applied in the field of plugging materials, can solve the problems of easy stickiness and poor low temperature degradation performance, and achieve the effect of improving environmental protection performance, excellent thermal processing performance, and high plugging strength

Active Publication Date: 2022-03-01
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Aiming at the above-mentioned problems existing in the prior art, the present invention provides a temporary plugging material and a preparation method thereof, which can effectively solve the problems of existing temporary plugging agents, such as easy stickiness at the initial stage of contact with water, and poor low-temperature degradation performance The problem

Method used

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  • A kind of temporary plugging material and preparation method thereof
  • A kind of temporary plugging material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A kind of temporary plugging material, its preparation method comprises the following steps:

[0042] (1) Put 10mol oxalic acid, 10.1mol polyethylene glycol (number average molecular weight 2000), 20.2g antimony trioxide, and 101g boric acid into a glass kettle with stirring, and react under nitrogen protection and normal pressure stirring at 100°C 1h, then raise the temperature to 180°C, maintain an absolute pressure of 200Pa, and stir in vacuum for 4h to obtain polyester polyol material;

[0043] (2) Put 11mol of hexamethylene-1,6-diisocyanate into a glass kettle with stirring, start stirring, heat up to 60°C, add 10mol of polydiethylene glycol adipate diol (number average molecular weight 1000 ), keep an absolute pressure of 10Kpa, and react with vacuum stirring for 1h to obtain a low-temperature temporary blocking prepolymer material;

[0044] (3) Inject the polyester polyol material in step (1) and the low-temperature temporary plugging prepolymer material in step...

Embodiment 2

[0046] A kind of temporary plugging material, its preparation method comprises the following steps:

[0047] (1) Put 5 mol oxalic acid, 5.25 mol polyethylene glycol (number-average molecular weight 4000), 210 g antimony trioxide, and 101 g boric acid into a glass kettle with stirring, and react under nitrogen protection at 100 °C and stirring at normal pressure for 1 h , and then heated up to 150°C, maintained an absolute pressure of 50Pa, and stirred and reacted in vacuum for 2 hours to obtain a polyester polyol material;

[0048] (2) Put 13 mol of toluene diisocyanate into a stirred glass kettle, start the stirring, raise the temperature to 60°C, add 10 mol of poly(diethylene glycol adipate) diol (number average molecular weight 1000), keep the absolute pressure at 10Kpa, vacuum Stirring and reacting for 1 hour to obtain a low-temperature temporary plugging prepolymer material;

[0049] (3) Inject the polyester polyol material in step (1) and the low-temperature temporary p...

Embodiment 3

[0051] A kind of temporary plugging material, its preparation method comprises the following steps:

[0052] (1) Put 4mol oxalic acid, 4.06mol polyethylene glycol (number-average molecular weight 6000), 50g antimony trioxide, 50g stannous chloride, and 243.6g boric acid into a glass kettle with stirring, and nitrogen at 140°C Protect, stir and react at normal pressure for 1 hour, then raise the temperature to 170°C, maintain an absolute pressure of 110Pa, and stir and react in vacuum for 3 hours to obtain polyester polyol materials;

[0053] (2) 3.6 mol of diphenylmethylene diisocyanate is put into a stirred glass kettle, the stirring is started, the temperature is raised to 65°C, and 3 mol of polydiethylene adipate diol (number average molecular weight 3000) is added, Maintain an absolute pressure of 10Kpa, stir and react in vacuum for 1 hour, and obtain a low-temperature temporary plugging prepolymer material;

[0054] (3) Inject the polyester polyol material in step (1) an...

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Abstract

The invention provides a temporary plugging material and a preparation method thereof. The preparation method comprises the following steps: stirring and reacting oxalic acid, polyethylene glycol, a main catalyst and a cocatalyst at 100-150° C. under inert gas protection conditions for 1-3 hours, Then stir and react at 150-180°C and absolute pressure of 50-200Pa under vacuum conditions for 2-4h to obtain polyester polyol material; Stir and react under 10-20KPa vacuum condition for 1-2h to obtain low-temperature temporary plugging prepolymer material; carry out reactive extrusion granulation of polyester polyol material and low-temperature temporary plugging prepolymer material at 150-170°C, be made of. The temporary plugging material can effectively solve the problems of the existing temporary plugging agents that are easy to stick at the initial stage of contact with water and have poor low-temperature degradation performance.

Description

technical field [0001] The invention belongs to the technical field of leakage plugging materials, and in particular relates to a temporary plugging material and a preparation method thereof. Background technique [0002] Traditional polyester materials and low-temperature temporary plugging materials have the problem of non-degradability or poor degradation performance. However, in fields such as oil and gas production (such as temporary plugging agents), materials are often required to provide high mechanical strength in a short period of time, which can effectively The pores and cracks in the rock formation are blocked, and then they must be able to degrade quickly. [0003] Common degradable materials such as polylactic acid (PLA) and polyglycolic acid (PGA) can basically meet the degradation requirements as temporary plugging agents above 100°C, but in low-temperature reservoirs such as 40-80°C, PLA or PGA The degradation speeds of these materials are quite slow, which...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/73C08G18/76C08G18/75C08G18/66C08G18/42C08G18/10C09K8/508C08G63/672C08G63/82C08G63/84C08G63/86
CPCC08G18/73C08G18/7614C08G18/755C08G18/7671C08G18/10C08G18/4238C09K8/5086C08G63/672C08G63/84C08G63/866C08G63/826C08G18/48
Inventor 毛金成陈安杜安琪肖舒月毛金桦杨小江林冲
Owner SOUTHWEST PETROLEUM UNIV
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