Water glass high temperature blocking agent for oil production

A water glass, high temperature technology, which is applied in earth-moving drilling, wellbore/well components, sealing/packing, etc., can solve problems such as the influence of temperature on the gelation time, the ineffective plugging effect, and the incomplete underground reaction. To achieve the effect of easy plugging, good long-term thermal stability, and control of the plugging effect

Inactive Publication Date: 2005-05-18
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason is that some indicators are difficult to control, such as the influence of temperature on gelation time, etc.
In addition, the double-liquid injection method makes the on-site construction process more cumbersome, and at the same time, the two components react incompletely underground, which easily leads to insignificant plugging effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take by weighing 25 g of water glass with a modulus of 3.1 and a solid content of 40% by mass fraction, pour 5 mL of glyoxal with a mass fraction of 10% into the water glass with constant stirring, and stir well to obtain the high-temperature blocking agent of the present invention. Composition by mass fraction is 33.33% water glass, 1.67% crosslinking agent, 65.00% water.

Embodiment 2

[0022] First, add ethyl acetate to water to make a 10% solution by mass fraction. Weigh 25g of water glass with a modulus of 2.8 and a solid content of 50% by mass fraction, then pour 3mL of the above-mentioned ethyl acetate solution into the water glass while stirring constantly to obtain the high-temperature blocking agent of the present invention, and its composition is by mass fraction Calculated as 44.64% water glass, 1.07% crosslinker, 54.29% water.

Embodiment 3

[0024] First, add ethyl acetate to water to make a 10% solution by mass fraction. Take by weighing 25g of water glass with a modulus of 2.8 and a solid content of 50% by mass fraction, then pour 5 mL of the above-mentioned ethyl acetate solution into the water glass while constantly stirring, then add 5 mL of water, and stir well to obtain the high temperature water glass of the present invention. The blocking agent is composed of 35.71% water glass, 1.43% crosslinking agent and 62.86% water by mass fraction.

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PUM

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Abstract

The high temperature water glass blocking agent for oil production contains water glass, cross-linking agent and water, and may have surfactant contained when some cross-linking agent is used. The blocking agent has wide application temperature range of 60-280 deg.c, and has the curing time of 5-8 hr at 100 deg.c, 3-5 hr at 200 deg.c and 2-3 hr at 250 deg.c. It has high post-curing strength, pressure strength of 0.2-0.5 MPa, excellent long term heat stability, and no obvious degradation in strength after curing and set at 200 deg.c for 2 months. It may be in-situ compounded simply and single-liquid injected, and has easy to control blocking effect. The blocking agent is suitable for use in avoiding blow-by in steam flooding and steam soaking oil wall.

Description

technical field [0001] The invention relates to a water glass high-temperature plugging agent for oil recovery, which can be used for steam flooding or steam huffing and puffing oil wells to prevent steam channeling and plugging. Background technique [0002] In the process of producing heavy oil, two methods of steam flooding and steam stimulation are usually used to reduce the viscosity of heavy oil so that the heavy oil can be easily produced. During the steam injection process, due to the heterogeneity of the reservoir and the difference between the density of steam and heavy oil, the phenomenon of steam gravity overlay and steam channeling will occur, resulting in the reduction of steam efficiency and oil recovery. Costs go up. Plugging high-permeability formations or large pores in oil reservoirs with plugging agents can improve the quality of steam injection and improve the effect of steam oil recovery. The plugging agent used for steam oil recovery must have good s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/12
Inventor 谌凡更王红娟卢卓敏
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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