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Temporary plugging agent suitable for temporary plugging and fracturing process of oil and gas reservoir and formation water plugging method

A technology of oil and gas reservoirs and temporary plugging agents, applied in chemical instruments and methods, earthwork drilling, sealing/isolation, etc., can solve problems such as poor plugging effects, and achieve easy promotion, strong practicability, and easy preparation The effect of the method

Active Publication Date: 2019-02-22
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, the temporary plugging agents used in oil production are mainly oil-soluble temporary plugging agents, but the plugging effect is not good

Method used

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  • Temporary plugging agent suitable for temporary plugging and fracturing process of oil and gas reservoir and formation water plugging method
  • Temporary plugging agent suitable for temporary plugging and fracturing process of oil and gas reservoir and formation water plugging method
  • Temporary plugging agent suitable for temporary plugging and fracturing process of oil and gas reservoir and formation water plugging method

Examples

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Effect test

Embodiment 1

[0033] Preparation of temporary plugging agent: Preheat the vermiculite at 100°C until water appears on the surface of the vermiculite, and then calcinate in a furnace at 1000°C to fully expand the vermiculite. The vermiculite that is fully expanded after calcining has a volume of 6.5 times that before calcining, density between 0.75 and 1.33, and good dispersion in water. The suspension stability of the temporary plugging agent material can be ensured by using 1.5% polyacrylamide solution.

[0034] The indoor test simulates the process parameters of the temporary plugging agent under construction conditions, and analyzes the change law of the construction parameters of the temporary plugging agent.

[0035] (1) Test material

[0036] ①Artificial core: use artificial ceramic core;

[0037] Man-made core production: first corundum powder (α-Al 2 o 3, industrial pure) and bauxite (with a specific particle gradation) according to a certain molar ratio, added to the corundum ba...

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Abstract

The invention relates to a temporary plugging agent suitable for a temporary plugging and fracturing process of an oil and gas reservoir and a formation water plugging method. The temporary plugging agent comprises vermiculite and a polyacrylamide solution, wherein the vermiculite is dispersed in the polyacrylamide solution, and the vermiculite is preheated and calcined. The temporary plugging agent is prepared from the fully expanded vermiculite and the polyacrylamide solution, can be transported to the crack tip with fracturing fluid and has better technical and economic effects when used asthe temporary plugging agent. The temporary plugging agent adopts a simple preparation method, has high temporary plugging efficiency and high practicability and is easy to popularize.

Description

technical field [0001] The invention relates to a temporary plugging agent suitable for temporary plugging and fracturing technology of oil and gas reservoirs and a formation water plugging method. Background technique [0002] After a period of exploitation in water injection oilfields, most of the low-permeability oil layers have been in a state of high water content, the crude oil controlled by old fractures has almost been exhausted, and fractures have become the main water outlet channels, but some wells still have a certain degree of water content under the existing production conditions. remaining recoverable reserves. [0003] Temporary plugging fracturing is to use a temporary plugging agent to selectively enter and effectively plug the original fracturing fractures and perforation holes, and then press open new fractures; or partially seal old fractures and press open them on the old fracture wall. New fractures are created, so as to reconstruct the drainage fract...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/508E21B43/26E21B33/13
CPCC09K8/5083C09K8/68E21B33/13E21B43/26
Inventor 俞然刚张尹田勇杨文东宋彦生郑彬涛
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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