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Method for conducting deep profile control over medium-high permeability oil reservoir

A deep profile control and high permeability technology, applied in earthwork drilling, wellbore/well components, production fluids, etc., can solve the problems of high cost, single reservoir, long construction time, etc., to improve utilization rate, water absorption profile Balance and improve the effect of oil displacement efficiency

Inactive Publication Date: 2016-06-08
YANTAI ZHIBEN INTPROP OPERATIONS MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, these deep profile control technologies only affect the reservoir, the cost is relatively high, and the construction time is long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The temperature of reservoir A in an oilfield is 70°C, the salinity of formation water is 5727mg / L, and the permeability is 2100×10 -3 μm 2 , the reservoir depth is 1510m, the reservoir thickness is 23m, the porosity is 0.412, the pore diameter is 1.83μm, and the pore volume is 2.0×10 5 m 3 , geological reserves 1.5×10 4 t. Utilize the method of the present invention to implement profile control in oil reservoir A, concrete steps are as follows:

[0035] (1) Inject cross-linked polymer profile control system for preliminary profile adjustment

[0036] The cross-linked polymer profile control system is composed of polymer and cross-linking agent, the mass concentrations are 800mg / L and 2000mg / L respectively; the polymer is polyacrylamide emulsion; the cross-linking agent is phenolic resin cross-linking agent.

[0037] The radius of the preliminary adjustment section is 3m, and the injection volume of the cross-linked polymer profile control system is a 1 πr 1 2 h...

Embodiment 2

[0049] The temperature of reservoir B in an oilfield is 75°C, the salinity of formation water is 12560mg / L, and the permeability is 2500×10 -3 μm 2 , the reservoir depth is 1980m, the reservoir thickness is 12m, the porosity is 0.358, the pore diameter is 1.6μm, and the pore volume is 4.0×10 5 m 3 , geological reserves 2.8×10 4 t. Utilize the method of the present invention to implement profile control in oil reservoir B, concrete steps are as follows:

[0050] (1) Inject cross-linked polymer profile control system for preliminary profile adjustment

[0051]The cross-linked polymer profile control system is composed of polymer and cross-linking agent, the mass concentrations are 3000mg / L and 500mg / L respectively; the polymer is polyacrylamide emulsion; the cross-linking agent is phenolic resin cross-linking agent.

[0052] The radius of the preliminary adjustment profile is 5m, and the injection volume of the cross-linked polymer profile control system is a 1 πr 1 2 hФ...

Embodiment 3

[0064] The temperature of reservoir C in an oilfield is 63°C, the salinity of formation water is 2670mg / L, and the permeability is 2800×10 -3 μm 2 , the reservoir depth is 2150m, the reservoir thickness is 8m, the porosity is 0.385, the pore diameter is 2.12μm, and the pore volume is 3.0×10 5 m 3 , geological reserves 2.1×10 4 t. Utilize the method of the present invention to implement profile control in oil reservoir C, concrete steps are as follows:

[0065] (1) Inject cross-linked polymer profile control system for preliminary profile adjustment

[0066] The cross-linked polymer profile control system is composed of polymer and cross-linking agent, the mass concentrations are 2000mg / L and 1200mg / L respectively; the polymer is polyacrylamide emulsion; the cross-linking agent is chromium cross-linking agent.

[0067] The radius of the preliminary adjustment profile is 2m, and the injection volume of the cross-linked polymer profile control system is a 1 πr 1 2 hФ=1.0×...

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Abstract

The invention belongs to the technical field of tertiary oil recovery and particularly relates to a method for conducting deep profile control over a medium-high permeability oil reservoir. The method includes the specific steps that a crosslinked polymer profile control system is injected for preliminary profile control; polymeric microspheres are injected, bridging is conducted in oil reservoir pores, deep profile control is conducted, and the functions of steering liquid flow and expanding the affecting size are achieved; formation water displacement fluid is injected; surfactant washing oil is injected, and normal water injection is conducted. By means of the method, the problem of water logging of an oil well caused by long-term water injection of a water injection well of the medium-high permeability oil reservoir can be effectively solved, blocking of a water channel is achieved so as to solve contradiction of the oil reservoir, a water absorbing profile of the water injection well can be more balanced, the utilization rate of injected water is raised, the waterflooding affecting size is expanded, accordingly the waterflooding development effect is improved, and the recovery efficiency is improved by 10% or above through field tests; therefore, the method can be widely applied to field tests of deep profile control over the medium-high permeability oil reservoir for improving recovery efficiency.

Description

technical field [0001] The invention belongs to the field of deep profile control of water injection wells in oil fields, in particular to a method for deep profile control of medium-high permeability oil reservoirs. technical background [0002] The profile control technology is to inject plugging agent into the water injection well to realize the plugging of the water flow channel, so as to improve the plane, interlayer and intralayer contradictions of the oil layer, make the water absorption profile of the water injection well more balanced, expand the swept volume of water flooding, It is a process technology to improve the effect of water flooding development. Both laboratory research and field practice have shown that implementing profile control in water injection wells can achieve the purpose of reducing water and increasing oil production, and is currently one of the leading technologies for controlling water and stabilizing oil in the high water-cut development per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22E21B43/20
CPCE21B43/162E21B43/20
Inventor 刘琴
Owner YANTAI ZHIBEN INTPROP OPERATIONS MANAGEMENT CO LTD
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