Method for producing oil by changing bottom water reservoir oil well into water dumping well and oil production well system

A bottom-water oil reservoir and self-flowing water injection technology, which is applied in wellbore/well components, production fluid, earthwork drilling and production, etc., can solve the problems of high operating costs, oil field production decline, etc., and achieve the effect of improving oil recovery

Inactive Publication Date: 2012-08-29
PETROCHINA CO LTD
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Problems solved by technology

[0003] For reservoirs with strong bottom water, especially when the bottom water is abnormally high pressure, water cones are easy to form during the production process. Once the bottom water breaks through to th

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  • Method for producing oil by changing bottom water reservoir oil well into water dumping well and oil production well system
  • Method for producing oil by changing bottom water reservoir oil well into water dumping well and oil production well system

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Embodiment Construction

[0029] The invention proposes an oil recovery method for converting an oil well in a bottom water reservoir into an artesian water injection well. The method is used to drill a well in a strong bottom water reservoir for depletion development. When the bottom water breaks through the oil well, the oil layer and the water layer below the oil layer are removed Drilling through, bottoming water to the reservoir to drive oil, thereby producing crude oil from other wells. The method is preferably to drill more than two oil wells in the strong bottom water reservoir area, including at least a vertical well and a horizontal well, the oil layer of the vertical well is connected with the water layer below the oil layer, and the bottom water can be drawn to the oil layer to drive oil, thereby Oil is produced from horizontal wells.

[0030] Preferably, the oil recovery method of the present invention comprises the following steps:

[0031] (1) Drill two oil wells in the strong bottom wa...

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Abstract

The invention discloses a method for producing oil by changing a bottom water reservoir oil well into a water dumping well and an oil production well system. In the oil production method, a well is digged on a strong bottom water reservoir; the depletion development is carried out; and when bottom water is broken through to the oil well, an oil layer and a water layer below the oil layer are drilled out to guide the bottom water to the oil layer to carry out oil displacement, so that crude oil is produced from other wells. According to the invention, the oil well which is seriously flooded is subjected to secondary well drilling, the oil layer is communicated with the water layer, the bottom water energy is sufficiently utilized, the bottom water is guided into the oil layer to carry out oil displacement and the crude oil is produced from the adjacent wells. The invention not only solves the problems caused by a water cone, but also sufficiently utilizes the natural energy of the bottom water, guides the bottom water to the oil layer to displace the crude oil and improves the recovery ratio of the crude oil.

Description

technical field [0001] The invention relates to an oil production method and an oil production well system, in particular to an oil production method and an oil production well system for converting an oil well in a bottom water reservoir into an artesian water injection well. Background technique [0002] In the middle and late stages of bottom water reservoir production, water breakthrough will inevitably occur in oil wells. If reasonable and effective water control measures are not taken, production will decline rapidly, recovery will decline, and the development effect will deteriorate. The most common phenomenon in bottom water reservoirs is the problem of bottom water coning. Bottom water coning means that in a reservoir with bottom water, before the reservoir is developed, the water is located in the lower part of the reservoir, and the oil is located in the upper part of the reservoir. If a production well is drilled in the oil-bearing part for oil production, a hemi...

Claims

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Application Information

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IPC IPC(8): E21B43/20
Inventor 刘雄志王天琦杨兆平李忠春
Owner PETROCHINA CO LTD
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