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Gas phase shielding steering cleaning and plug-removing technology for oil field

A clean solution, gas-phase technology, applied in the direction of cleaning equipment, wellbore/well components, drilling composition, etc., can solve the problems of reducing the efficiency of temporary plugging, reducing the effect of plugging removal, and the difficulty of dissolving temporary plugging agents, etc., to achieve Expand the unblocking area, improve the effect of measures, and strengthen the effect of blocking effect

Inactive Publication Date: 2018-09-18
SHAANXI JINGRUI PETROLEUM ENG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The key to the temporary plugging and acidizing process in oilfield development is uniform acid distribution, which can effectively contact the plugging of thick layers or vertical heterogeneous layers, and at the same time restore the production profile. However, the existing technology has the following shortcomings and deficiencies: ① There are many types of temporary plugging agents. Due to the complex formation, it brings many difficulties to the selection of temporary plugging agents. The chemical agents are not compatible with the formation, which reduces the temporary plugging efficiency; If it is discharged, it will cause secondary pollution of the formation and reduce the effect of plugging removal; due to the limited plugging strength of chemical temporary plugging agents, especially for low-pressure wells and medium-high permeability layers, the amount of use is large, the economic cost is high, and the effect is not obvious

Method used

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  • Gas phase shielding steering cleaning and plug-removing technology for oil field
  • Gas phase shielding steering cleaning and plug-removing technology for oil field
  • Gas phase shielding steering cleaning and plug-removing technology for oil field

Examples

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example 1

[0022] The invention provides a gas-phase shielding steering cleaning and plugging removal process for oil fields, which includes the following steps:

[0023] (1) Pre-construction treatment is carried out at the blocked part of the formation, and pre-shielding diverting agent is injected;

[0024] (2) After all the pre-shielding steering agent has flowed in, inject the rear main body liquid;

[0025] (3) Shut in the well for 1 hour and discharge the residual liquid;

[0026] Measured by weight percentage, the composition of the pre-screening diverting agent: non-ionic surfactant: 5.0%, stabilizer: 3.0%, miscible regulator: 3.0%, gas generator: 20.0%, miscible enhancer: 3.0% , liquid phase fluid: 66.0%; the composition of the post-main liquid: 8% to 16% of inorganic monobasic acid, 3% to 6% of inorganic dibasic acid, 3% to 6% of organic monobasic acid, and 3% of organic dibasic acid ~6%, organic protective agent 1.0%~3.0%, organic stabilizer 2.0%~3%, inorganic stabilizer 1.0...

Embodiment 2

[0032] Well XX is an oil production well in X Oilfield, producing Chang 6 1 1 layer, length 6 1 1 The thickness of the reservoir oil layer is 29.m, and the degree of injection is 42.2%. The dynamics of this well in x years and x months have become worse, and the water cut has suddenly increased by 84.2%. The above-mentioned gas-phase shielding and switching to cleaning and plugging removal technology is adopted. After a period of time, the statistical effect is: After measures Liquid volume 6.14 m 3 , the oil production was 3.2t, and the water cut decreased by 95.6%.

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Abstract

The invention provides a gas phase shielding steering cleaning and plug-removing technology for an oil field. According to the gas phase shielding steering cleaning and plug-removing technology, a mixed-phase fluid formed by taking inert gas as a dispersed phase and liquid as a disperse medium serves as a front-loading shielding steering agent; according to the minimum flowing resistance principle, the front-loading shielding steering agent preferentially enters a high-permeability layer or a crack with the small flowing resistance; and along with continuous entering of the shielding steeringagent, shielding bridge plugging is formed in a large pore channel and the crack, and an effective plugged layer is finally formed; during construction, rear-loading main liquid encounters the shielding plugging layer and then steers to enter a low-permeability layer, distribution is more even and more efficient, the purpose of steering and removing the low-permeability layer is achieved, the plug-removing area is expanded, and the effect of measures is improved.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemistry, and in particular relates to a gas-phase shielding and steering cleaning and plugging-removing process for oilfields, which is used for unblocking formation blockage control of high water content wells and uneven oil-water wells in oilfield development. Background technique [0002] The key to the temporary plugging and acidizing process in oilfield development is uniform acid distribution, which can effectively contact the plugging of thick layers or vertical heterogeneous layers, and at the same time restore the production profile. However, the existing technology has the following shortcomings and deficiencies: ① There are many types of temporary plugging agents. Due to the complex formation, it brings many difficulties to the selection of temporary plugging agents. The chemical agents are not compatible with the formation, which reduces the temporary plugging efficiency; If it is d...

Claims

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Application Information

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IPC IPC(8): E21B37/06C09K8/594C09K8/74
CPCC09K8/594C09K8/74E21B37/06
Inventor 焦泾川姜武
Owner SHAANXI JINGRUI PETROLEUM ENG CO LTD
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