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Hot air filling balance oil recovery technique 'guqian' mountain oil reservoir

A technology of air injection and buried hill, which is applied in the fields of fluid production, earth-moving drilling, wellbore/well components, etc., can solve problems such as crude oil production, and achieve the effect of increasing production and expanding the volume of oil layers.

Inactive Publication Date: 2008-07-02
尤尼斯油气技术(中国)有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0002] In the process of oil field development, buried hill reservoirs generally have a high oil production rate. Due to the influence of lithology, crude oil in massive buried hill structural reservoirs exists in tight fractures and fractured pores, and the production depends on the bottom of the buried hill. The energy of the bottom water drives the oil layer, but as the bottom water rises, the production will continue to decline. In order to increase the recovery, the method of injecting water into the bottom of the buried hill to push the bottom water upward can increase the recovery, but this In this water injection method, when the bottom water rises to the top of the buried hill, the water content in the well can reach more than 95%, that is, the crude oil in the oil well cannot be exploited, and the remaining oil in the buried hill becomes a dead oil area. The method of air injection oil recovery in mountain oil reservoirs can exploit the remaining oil in this kind of ancient buried hill oil reservoirs and increase the recovery rate by 20%. This method has not been reported after searching domestic and foreign literature

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  • Hot air filling balance oil recovery technique 'guqian' mountain oil reservoir

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Experimental program
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Embodiment 1

[0022] In Figure 1, the physical parameters of the reservoir should be selected before implementation. This method is mainly used in carbonate buried hill, quartz buried hill structural reservoirs and thin oil reservoirs. The lithology is shallow-grained migmatite, granulite, biotite or shallow-grained cataclysmic rock in carbonate and quartzite buried hills. There are structural fractures in the pores of the buried hill, and there are dual media of fractured pores and micropores in the fractures. The oil layer is in the shape of a massive buried hill. For the old oil wells drilled in the rock mass with bottom water at the bottom of the buried hill, the old oil wells must be inspected before construction. The original perforated section of the oil well is sealed, and the perforation is re-perforated according to the construction requirements. In addition, the old oil well that has been exploited has a water content above 95% and has no oil recovery value. Then, through the gas...

Embodiment 2

[0024] When the buried hill oil reservoir is exploited, after the first step of the embodiment is completed, the oil is recovered in the reservoir above the new oil-water interface 3 after gas injection, and when the recovery process occurs, the new oil-water interface 3 after gas injection occurs In other words, when the production well 8 sees the gas display, the water injection well can be used to inject water to the bottom of the buried hill to adjust the oil-water interface, so as to maintain the original formation pressure in the well with sufficient energy.

Embodiment 3

[0026] The position of the new oil-water interface 3 after gas injection determines the amount of oil produced by the oil well, so it is very important to control the position of this interface. The new oil-water interface 3 after gas injection is the position of the equilibrium interface.

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Abstract

A process for balance-extracting oil from oil layer of buried hill by injecting high temperature air includes injecting high temperature air of above 350 deg.c at position of gas cap on buried hill old oil well to let rised oil-water boundary caused by exploiting crude oil move downwards for certain distance then exploiting crude oil in well by air driving means for raising recovery ratio of old oil well by 15 %.

Description

Technical field: [0001] The invention relates to an air-injection oil recovery method for an ancient buried hill oil reservoir, which belongs to oil field burning oil layer displacement technology. Background technique: [0002] In the process of oil field development, buried hill reservoirs generally have a high oil production rate. Due to the influence of lithology, crude oil in massive buried hill structural reservoirs exists in tight fractures and fractured pores, and the production depends on the bottom of the buried hill. The energy of the bottom water drives the oil layer, but as the bottom water rises, the production will continue to decline. In order to increase the recovery, the method of injecting water into the bottom of the buried hill to push the bottom water upward can increase the recovery, but this In this water injection method, when the bottom water rises to the top of the buried hill, the water content in the well can reach more than 95%, that is, the cru...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/24
Inventor 祝学江邓惠荣
Owner 尤尼斯油气技术(中国)有限公司
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