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Highly-heatproof temporary plugging agent for oil wells

A temporary plugging agent, high heat resistance technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of heat resistance, temporary plugging and poor recovery performance, and achieve the effect of prolonging the temporary plugging effect, Improve thermal resistance and good structural symmetry

Inactive Publication Date: 2019-05-21
于鑫娅
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a temporary plugging agent with high heat resistance for oil wells in view of the problems of poor heat resistance, temporary plugging and recovery performance of the current traditional oil well temporary plugging agent

Method used

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  • Highly-heatproof temporary plugging agent for oil wells

Examples

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preparation example Construction

[0030] The preparation method of composite temporary plugging base material comprises the following steps:

[0031](1) Take palygorskite and pulverize it in a pulverizer, pass through a 80-mesh sieve, collect the sieved particles according to the mass ratio of 1:8~14, add hydrochloric acid with a mass fraction of 12% and mix in the reactor, at 65~80°C, at 400~ Stir at 700r / min for 40~60min, filter, collect the filter residue and add reagent A to mix according to the mass ratio of 1:8~14, heat up to 85~95°C, keep warm for 40~60min, cool naturally to room temperature, filter, take the filter cake and wash it with water After 2~4 times, dry in an oven at 90~100°C for 3~5h to obtain the dried product. Take the dried product, polyvinyl alcohol, surfactant, and ball milling medium in the ball mill according to the mass ratio of 6~10:3:1:1. Tank mixing, ball milling at 350~550r / min for 1~3h, to obtain ball mill, in parts by weight, take 25~40 parts of ball mill, 12~20 parts of dimeth...

Embodiment 1

[0036] Surfactant: Mix cetyltrimethylammonium bromide and dodecyldimethylbetaine at a mass ratio of 7:1 to obtain a surfactant.

[0037] Ball milling medium: Mix acetone and ethanol solution with a volume fraction of 70% at a mass ratio of 1:3 to obtain a ball milling medium.

[0038] Additive: Mix sodium polyacrylate, polyacrylamide, and hydroxymethyl cellulose in a mass ratio of 3:2:1 to obtain the additive.

[0039] Reagent A: Take 10% hydrogen peroxide and 15% NH at a mass ratio of 15:7 4 Cl solutions were mixed to obtain reagent A.

[0040] Reagent B: Mix PBS buffer with a pH value of 7.8~8.2 and ammonium bicarbonate at a mass ratio of 13:4 to obtain Reagent B.

[0041] Auxiliary agent: Mix decene, magnesium stearate, and microcrystalline paraffin wax at a mass ratio of 6:5:1 to obtain an auxiliary agent.

[0042] Nitrocellulose treatment material: mix nitrocellulose, OP-10, triethyl citrate, and water with a nitrogen content of 12.1% according to a mass ratio of 5:1:1...

Embodiment 2

[0049] Surfactant: Mix cetyltrimethylammonium bromide and dodecyldimethylbetaine at a mass ratio of 7:2 to obtain a surfactant.

[0050] Ball milling medium: Mix acetone and ethanol solution with a volume fraction of 70% at a mass ratio of 1:5 to obtain a ball milling medium.

[0051] Additives: Mix sodium polyacrylate, polyacrylamide, and hydroxymethyl cellulose at a mass ratio of 5:2:1 to obtain additives.

[0052] Reagent A: Take 10% hydrogen peroxide and 15% NH at a mass ratio of 20:7 4 Cl solutions were mixed to obtain reagent A.

[0053] Reagent B: Mix PBS buffer with a pH value of 8.0 and ammonium bicarbonate at a mass ratio of 19:4 to obtain Reagent B.

[0054] Auxiliary agent: Mix decene, magnesium stearate, and microcrystalline paraffin wax at a mass ratio of 8:5:1 to obtain an auxiliary agent.

[0055] Nitrocellulose treatment material: mix nitrocellulose with a nitrogen content of 13.1%, OP-10, triethyl citrate, and water at a mass ratio of 7:1:1:25, mix them wi...

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Abstract

The invention discloses a highly-heatproof temporary plugging agent for oil wells, and belongs to the technical field of oil exploitation. Anions in the system are captured by a cationic polymer on the surface of the system to improve the stability of the temporary plugging in the oil wells. NH3 and CO2 gases produced by the cationic polymer can remove the polar groups on the surface and generatepores in the surface in order to gradually achieve the dredging effect, so the heatproof performance is improved, and the temporary plugging cycle is prolonged. A self-made polyester resin is used, gallic acid can be pyrolyzed at a high temperature to produce free aromatic rings, and the free aromatic rings are dispersed in the self-made polyester resin, so the heatproof property of the polyesterresin is further improved, the mechanical properties of the plugging structure are enhanced, and the temporary plugging effect is improved; and the reduction of the viscosity and internal mechanical properties with the increase of temperature and the long-time action cooperates with the gases generated in the system to achieve the plugging releasing effect. The problems of poor heatproof performance, poor temporary plugging performance and poor recovery performance of conventional temporary plugging agents for oil wells are solved in the invention.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a temporary plugging agent for high heat-resistant oil wells. Background technique [0002] Low-permeability oilfields are rich in geological reserves and have great potential for development. Although most low-permeability reservoirs have a large increase in production after fracturing, the production is still not high. In recent years, major oilfields have adopted multi-fracture technology or fracture diversion technology in the fracturing operation to intensify efforts to stimulate low-permeability reservoirs and maximize reservoir production. A class of reagents that play a decisive role in this technology is the temporary plugging agent. [0003] Temporary plugging agent, also known as diverting agent, is a treatment agent widely used in oilfield production, and has been maturely used in on-site construction operations, including: drilling, stimu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/508C09K8/514
Inventor 于鑫娅
Owner 于鑫娅
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