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Method for extracting residue oil by injecting profile control agent to norizontal well for blocking water injection path of oil reservoir

A technology for horizontal wells and residual oil, which is applied in the fields of fluid production, earth-moving drilling, sealing/packing, etc., can solve the problems of difficult to extract residual oil and cannot be promoted, and achieves the effect of reasonable design, high efficiency and low investment.

Inactive Publication Date: 2009-03-11
王胜存
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the method of direct oil recovery from horizontal wells is still difficult to recover remaining oil, which is also an important factor why direct oil recovery from horizontal wells cannot be popularized.

Method used

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  • Method for extracting residue oil by injecting profile control agent to norizontal well for blocking water injection path of oil reservoir
  • Method for extracting residue oil by injecting profile control agent to norizontal well for blocking water injection path of oil reservoir
  • Method for extracting residue oil by injecting profile control agent to norizontal well for blocking water injection path of oil reservoir

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Experimental program
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Effect test

Embodiment 1

[0013] In the homogeneous oil layer of wells distributed by the five-point method, the water scour near the injection and production wells is the strongest, and the water scour farther away from the oil and water wells is the weakest. Therefore, the remaining oil in the reservoir is enriched in figure 1 At the shaded position shown, the injected water flows according to the water injection channel indicated by the arrow, and the remaining oil in the stagnation area of ​​the shaded part is difficult to be washed away. If horizontal wells are directly used to exploit the oil in the remaining oil blocks, then the production fluid entering the horizontal well is still the fluid from the main channel or the fluid from the high-permeability section. figure 1 As shown, the remaining oil cannot be exploited, and the water content cannot be reduced. Therefore, horizontal wells cannot be used for direct oil recovery. In this regard, the No. 6 Oil Production Plant of Daqing Oilfield ha...

Embodiment 2

[0016] As the same inventive concept of the present invention, according to the distribution rules of different oil layers, the horizontal profile control injection-production well group can also be used to exploit the remaining oil, such as image 3 shown. In the horizontal well group, horizontal well a is injected with profile control agent, horizontal well b is used as a water injection well, horizontal well c is used as an oil production well, and the remaining oil at well a is extracted. Then inject the profile control agent into the horizontal well c, change the horizontal well a into a water injection well, and change the horizontal well d into an oil production well, and extract the remaining oil in the well c. The remaining oil at each horizontal well is recovered through the alternate exchange of the functions of each horizontal well.

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Abstract

This invention relates to a method for exploiting residual oil utilizing horizontal well to inject profile control agent to block the water channel of oil layers, which utilizes a horizontal wall group vertical to the master flow-line direction to fill in the profile control agent to stop the water-injection channel in the filling and exploiting arrays of a plane oil geologic structure. After the original water channel is filled with the horizontal profile control agent, the water is forced to change its direction to flush the residual oil to be exploited by lower reach production wells.

Description

technical field [0001] The invention belongs to petroleum exploitation, and particularly relates to a method for exploiting remaining oil by injecting a profile control agent into a horizontal well to plug off a water injection channel of an oil layer. Background technique [0002] After years of development in Daqing Oilfield, there is a large amount of remaining oil in the stagnant areas of various oil layers that cannot be exploited. At present, horizontal well drilling technology is mature. If a horizontal well is used for direct oil production (or water injection), due to the difference in permeability of the horizontal section of the horizontal well, the liquid production (higher water content) of the several-meter-long high-permeability section can occupy the narrow space of the horizontal well. Therefore, it is difficult for the liquid produced in the low-permeability section with higher oil content to enter the horizontal well. Therefore, the method of direct oil r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/12E21B43/20
CPCE21B43/20E21B43/305
Inventor 王胜存王文秋王皓
Owner 王胜存