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Channeling preventing and plugging agent and construction method for controlling plugging and sealing channeling by utilizing channeling preventing and plugging agent

A channel blocking and anti-channeling technology, applied in chemical instruments and methods, earth-moving drilling, sealing/sealing, etc., can solve the problems of weak gel strength, short stability period, difficult to achieve high temperature anti-channeling blocking and other problems

Active Publication Date: 2015-11-25
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these prior art plugging agents generally have weak gel strength, low plugging strength, and a short stable period. At the same time, the temperature of steam injection / gas production in heavy oil reservoirs is high, and the steam injection / gas temperature is generally 200°C. Above, the steam / gas injection temperature in some oilfields is even above 300°C, and when the steam / gas injection pressure is high and the formation has large pores, it is difficult to achieve the effect of high temperature anti-channeling and blocking channeling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] This embodiment provides an anti-channeling and blocking agent, which includes a high-temperature resistant pre-blocking agent as a pre-blocking slug, a strengthening gel plugging agent as an intermediate strengthening slug, and a high-strength resin blocking agent as a post-sealing slug Composed of three composite slugs.

[0073] in:

[0074] Based on the total weight of the high temperature resistant plugging agent as 100wt%, its raw materials include: 0.3wt% polyacrylamide, 0.3wt% composite thickener, 6wt% plugging agent, 0.05wt% heat stabilizer, and the balance is W block poured water;

[0075] Polyacrylamide is partially hydrolyzed polyacrylamide with a degree of hydrolysis of 25% and a molecular weight of 20 million;

[0076] The composite thickener is a combination of polyanionic cellulose and xanthan gum, which respectively account for 58wt% and 42wt% of the total weight of the composite thickener;

[0077] The leak-stopping agent is a combination of cottonse...

Embodiment 2

[0198] This embodiment provides an anti-channeling and blocking agent, which includes a high-temperature resistant pre-blocking agent as a pre-blocking slug, a strengthening gel plugging agent as an intermediate strengthening slug, and a high-strength resin blocking agent as a post-sealing slug Composed of three composite slugs.

[0199] in:

[0200] Based on the total weight of the high temperature resistant plugging agent as 100wt%, its raw materials include: 0.3wt% polyacrylamide, 0.3wt% composite thickener, 5wt% plugging agent, 0.03wt% heat stabilizer, and the balance is W block poured water;

[0201] Polyacrylamide is partially hydrolyzed polyacrylamide with a degree of hydrolysis of 30% and a molecular weight of 25 million;

[0202] The composite thickener is a combination of polyanionic cellulose and xanthan gum, which respectively account for 60wt% and 40wt% of the total weight of the composite thickener;

[0203] The leak-stopping agent is a combination of cottonse...

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Abstract

The invention provides a channeling preventing and plugging agent and a construction method for controlling plugging and sealing channeling by utilizing the channeling preventing and plugging agent. The channeling preventing and plugging agent comprises a high-temperature-resistance pre-plugging agent serving as a pre-posed pre-plugging plug, an enhanced gel plugging agent serving as an intermediate enhanced plug and a high-strength resin plugging agent serving as a postposed sealing plug. The channeling preventing and plugging agent has the characteristics of high temperature resistance, long-term stability, good plugging performance and the like. The invention further provides a construction method for controlling plugging and sealing channeling by utilizing the channeling preventing and plugging agent. The method has a simple constructing process, and can be used for constructing after the channeling preventing and plugging agent is directly prepared on the spot. The channeling preventing and plugging agent can be used for effectively solving the adverse impact of the steam / air channeling phenomenon of a heavy oil thermal production well on production, and has an important effect on prolonging the production cycle of a heavy oil well and improving the recovery efficiency.

Description

technical field [0001] The invention belongs to the technology of improving oil recovery rate developed in oilfields, and in particular relates to an anti-channeling and blocking agent and a construction method for regulating and blocking channeling by using the same. Background technique [0002] Steam stimulation technology, steam flooding technology, and fire flooding technology are important means for the development of heavy oil reservoirs in my country. After multiple rounds of steam injection / gas production, due to the difference in permeability between reservoirs, plane and vertical contradictions are more prominent. It causes steam / gas to rush along the high-permeability zone, leading to serious steam / gas channeling, which makes the oil well unable to produce normally. [0003] For steam / gas channeling wells in heavy oil reservoirs, technologies such as polymer gel and nitrogen foam gel are often used at present, which can achieve the purpose of improving the steam / g...

Claims

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Application Information

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IPC IPC(8): C09K8/467E21B33/13
CPCC09K8/426C09K8/467E21B33/13
Inventor 刘强李瑞马昌明王浩龙华郑猛柳荣伟陈小凯田野由春坤匡旭光白勐白龙王艳微段强国仲超
Owner PETROCHINA CO LTD
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