Method for controlling steam channeling of steam-injected oil reservoir

A steam channeling and gasoline technology, which is applied in earth-moving drilling, fluid production, wellbore/well components, etc., can solve the problems of high price, large consumption, and limited large-scale use, etc., to achieve enhanced stability, large specific surface area, Degradation-inhibiting effect

Active Publication Date: 2015-01-28
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, polymers such as high-temperature-resistant water-based agglomerating agents, special thickeners, and clay stabilizers are used to block steam-flooded high-permeability strips, and good mine results have been seen, but due to the large amount of use, the price Expensive, which limits its large-scale use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment provides a method for preventing and controlling steam channeling in a steam injection reservoir applied to a steam flooding heavy oil reservoir, which includes the following steps:

[0030] Step 1: Inject 100 tons of fiber solution into the steam channeling injection well to form a fiber slug at an injection rate of 10 tons / day;

[0031] Among them, the fiber solution used is composed of fiber, cellulose thickener (sodium carboxymethyl cellulose) and formation water with a salinity of 3000ppm, and the thickened water compounded by cellulose thickener and formation water is used as The carrier solution of the fiber solution, the mass ratio of cellulose thickener to formation water is 0.01:1, the fiber is composed of carbon fiber and high temperature resistant polyester fiber, the fiber accounts for 1% of the total mass of the fiber solution, and the carbon fiber accounts for the total mass of the fiber 60%; the molecular weight of the high temperature re...

Embodiment 2

[0039] This embodiment provides a method for preventing and controlling steam channeling in a steam injection reservoir applied to a steam flooding heavy oil reservoir, which includes the following steps:

[0040] Step 1: Inject 500 tons of fiber solution into the steam channeling injection well to form a fiber slug at an injection rate of 50 tons / day;

[0041] Among them, the fiber solution used is composed of fiber, cellulose thickener (sodium carboxymethyl 2-carboxyethyl cellulose) and formation water with a salinity of 10000ppm, and the cellulose thickener is compounded with formation water The thickened water is used as the carrier solution of the fiber solution. The mass ratio of the cellulose thickener to the formation water is 0.05:1. The fiber used is composed of carbon fiber and polyester fiber with high temperature resistance, and the fiber accounts for 10% of the total mass of the fiber solution 10%, carbon fiber accounts for 80% of the total fiber mass; the molecu...

Embodiment 3

[0048] This embodiment provides a method for preventing and controlling steam channeling in a steam injection reservoir applied to a steam flooding heavy oil reservoir, which includes the following steps:

[0049] Step 1: Inject 1,000 tons of fiber solution into the steam channeling injection well to form a fiber slug at an injection rate of 100 tons / day;

[0050] Among them, the fiber solution used is composed of fiber, cellulose thickener (2-carboxybutyl methyl cellulose) and formation water with a salinity of 80000ppm, and the thickened water compounded with cellulose thickener and formation water As the carrier solution of the fiber solution, the mass ratio of the cellulose thickener to the formation water is 0.1:1. The fiber used is composed of carbon fiber and high temperature resistant polyacrylonitrile fiber. The carbon fiber accounts for 90% of the total fiber mass, and the fiber accounts for 50% of the total mass of the fiber solution; the molecular weight of the hig...

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PUM

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Abstract

The invention provides a method for controlling steam channeling of a steam-injected oil reservoir. The method comprises the following steps: injecting fiber solution into an injection well in which the steam channeling occurs to form a fiber section plug; injecting nano-particle solution into the injection well in which the steam channeling occurs to form a nanoparticle section plug; when the injection pressure is higher than the average steam injection pressure of a steam channeling section by 3-5MPa, the water content of a steam channeling production well is reduced to below 60 percent, and when the temperature of a wellhead of the production well is reduced to below 100DEG C, injecting the steam again, and finishing the control over the steam channeling of the steam-injected oil reservoir. According to the method for controlling the steam channeling of the steam-injected oil reservoir, provided by the invention, the porosity space of a reservoir with a high permeability zone can be effectively reduced, the permeability of the reservoir is reduced, the high permeability zone is blocked, and the action of controlling the steam channeling is achieved.

Description

technical field [0001] The invention relates to a method for exploiting an oil reservoir, in particular to a method for preventing and controlling steam channeling in a steam injection reservoir, and belongs to the technical field of oil exploitation. Background technique [0002] For heavy oil reservoirs with an underground crude oil viscosity higher than 1000 MPa·s, steam injection thermal recovery is usually used. Steam injection thermal recovery includes steam flooding recovery method, steam huff and puff recovery method and steam assisted gravity drainage recovery method. [0003] In the process of steam flooding development, due to the heterogeneity of the reservoir, there are usually fractures and high-permeability bands in the reservoir, and the injected steam is easy to escape along the fractures and high-permeability bands. Field tests of steam flooding and super-heavy oil steam flooding in shallow layers of Xinjiang Oilfield have shown that during steam flooding, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24E21B33/13
CPCE21B33/13E21B43/24
Inventor 吴永彬王红庄
Owner PETROCHINA CO LTD
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