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

A process technology and high-temperature air technology, which is applied in the technical field of high-temperature air-balanced oil recovery technology in ancient buried hill oil reservoirs, can solve problems such as mining, and achieve the effects of expanding oil layer volume, improving oil well productivity, and increasing production.

Inactive Publication Date: 2006-09-20
尤尼斯油气技术(中国)有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the process of oilfield development, the oil production of buried hill reservoirs is generally very high. Due to the influence of lithology, such as massive buried hill structural reservoirs, oil exists in tight fractures and fractured pores, and the production depends on the bottom of the buried hill. The oil layer is driven by water energy. Due to the rise of the bottom water, the production rate decreases. In order to increase the recovery rate, there is no precedent for using fire to burn the oil layer similar to the massive buried hill reservoir. It can improve the recovery rate, but when this water injection method reaches a certain level, that is, 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 oil that exists in the buried hill Remaining oil becomes a dead oil area, for this reason, a high-temperature air balanced oil recovery process for ancient buried hill reservoirs can be used to exploit the remaining oil in such ancient buried hill reservoirs, increasing the recovery rate by 20%. This method has been retrieved There is no report in the literature at home and abroad

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

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Embodiment 1

[0023] In Fig. 1, the physical parameters of the reservoir should be selected before the implementation of the present invention. This method is mainly used in carbonate buried hill, quartz buried hill structural reservoirs and thin oil reservoirs. The lithology should be carbonate and quartz buried hills and metamorphic rocks (hybrid migmatite, granulite, biotite lithic cataclysmic rock). 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 shape of the oil layer is 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 wells should be dealt with before construction. Plug the perforated well section and re-perforate according to the construction requirements. In addition, the old oil well that has been exploited has a water content above 95%, that is, it can be used when there is no oil production value at presen...

Embodiment 2

[0025] When the buried hill oil reservoir is exploited, after the first step of the embodiment is completed, the oil is extracted from the reservoir above the new oil-water interface 3 after the gas injection in the old oil well, and when the recovery process occurs such as the gas injection When the newly-produced oil-water interface 3 moves down, that is, when the production well 8 sees the gas display, the method of injecting water to the bottom of the buried hill through the water injection well can be adopted to adjust the oil-water interface to maintain the original formation pressure in the well with sufficient energy.

Embodiment 3

[0027] The position of the newly produced oil-water interface 3 after gas injection in the present invention determines the amount of oil produced by the oil well, so it is very important to control the position of this interface. Determined by hot air at 350°C, the optimum position of the newly produced oil-water interface 3 after gas injection should be controlled at 2 / 3 of the oil-water interface 2 below the oil-water interface 2 after the bottom water rises before gas injection in the original old well after production.

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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 a high-temperature air-injection balanced oil recovery technology for an ancient buried hill oil reservoir, which belongs to oil field burning oil layer displacement technology. Background technique: [0002] In the process of oilfield development, the oil production of buried hill reservoirs is generally very high. Due to the influence of lithology, such as massive buried hill structural reservoirs, oil exists in tight fractures and fractured pores, and the production depends on the bottom of the buried hill. The oil layer is driven by water energy. Due to the rise of the bottom water, the production rate decreases. In order to increase the recovery rate, there is no precedent for using fire to burn the oil layer similar to the massive buried hill reservoir. It can improve the recovery rate, but when this water injection method reaches a certain level, that is, when the bottom water rises to the top of the buried hill, the wa...

Claims

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Application Information

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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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