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A comprehensive treatment method for bottom water coning in high permeability zone, shutting down wells, blocking, dredging and production control

A comprehensive treatment, high-permeability technology, applied in chemical instruments and methods, production fluids, earth-moving drilling, etc., can solve the problems of scrapping oil and gas wells, casing deformation, affecting oil and gas production, etc. effect of life

Active Publication Date: 2021-09-07
四川洁能锐思石油技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of oil and gas development, the existing technology cannot effectively control the sudden increase of water content in oil and gas layers caused by bottom water coning. Stratum collapse, casing deformation, and oil and gas wells are scrapped, seriously affecting the normal production and life of oil and gas wells

Method used

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  • A comprehensive treatment method for bottom water coning in high permeability zone, shutting down wells, blocking, dredging and production control
  • A comprehensive treatment method for bottom water coning in high permeability zone, shutting down wells, blocking, dredging and production control
  • A comprehensive treatment method for bottom water coning in high permeability zone, shutting down wells, blocking, dredging and production control

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preparation example Construction

[0045] In the present invention, there is no special limitation on the preparation method of the nitrogen foam, which can be prepared by a preparation method well known to those skilled in the art.

[0046] In the present invention, since the bottom water occupies the oil and gas flow channel, the nitrogen foam preferably completely blocks the bottom water coning channel, and the channel has no oil and gas flow, while the nitrogen foam can exist stably for a long time.

[0047] After the selective water shutoff is completed, the present invention uses high-pressure supercritical carbon dioxide to seismically break the reservoir in the high-permeability zone to realize hydrophobic flow.

[0048] In the present invention, during the seismic crushing, the pumping pressure of the supercritical carbon dioxide is preferably 75-100 MPa. In the present invention, during the seismic crushing, the action range of the supercritical carbon dioxide is preferably within the range of 500-700...

Embodiment

[0065] 1. Selective water shutoff-nitrogen foam water shutoff for the large outlet channel along the high permeability zone;

[0066] The fracture angle in the high permeability zone is 50-90°.

[0067] For active bottom water coning into oil and gas reservoirs, nitrogen foam water blocking technology can be used to produce high-strength foam water blocking layer, which can effectively block the water intrusion channel and prevent bottom water from coning along the high-permeability water channel again in the future production process .

[0068] Nitrogen foam is composed of dispersed phase (nitrogen), foaming agent (surfactant) and foam stabilizer (active jelly), and the mass ratio of nitrogen, surfactant and active jelly is 2:1:7.

[0069] Nitrogen foam is a selective water blocking agent that preferentially enters formations with high water saturation.

[0070] Nitrogen foam can exist stably in formations with high water saturation, but not in formations with high oil satu...

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Abstract

The invention provides a comprehensive control method for shutting down wells, plugging, dredging, and production control of bottom water coning along a high-permeability zone, belonging to the field of oil and gas exploitation. The present invention provides a comprehensive treatment method for shutting down and shutting down wells along the bottom water of the high-permeability zone to block and dredge production control, adhering to the comprehensive treatment concept of "blocking, dredging and mining control", first using nitrogen foam to selectively shut off water, and then using high-pressure supercritical carbon dioxide Seismically crush the reservoir to realize water-repellent separation, then use supercritical carbon dioxide to exploit condensate oil and gas to improve recovery, and finally use water-controlling agent to control water outflow in low water-cut areas and prevent water outflow in low-water-cut areas. After these four steps of treatment, It realizes the control of bottom water coning in the high permeability zone, improves oil and gas recovery, and prolongs the life of oil and gas wells.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploitation, in particular to a comprehensive control method for shutting down wells, shutting down wells, dredging and controlling production along the bottom water coning along a high-permeability zone. Background technique [0002] Bottom water coning is one of the difficult problems in the development of bottom water reservoirs. Due to the complex seepage mechanism of bottom water reservoirs, it is of great significance to study the law of bottom water coning and its control methods to improve the development effect of bottom water reservoirs. However, in the process of oil and gas development, the existing technology cannot effectively control the sudden increase of water content in oil and gas layers caused by bottom water coning. Stratum collapse, casing deformation, and oil and gas wells are scrapped, seriously affecting the normal production and life of oil and gas wells. Contents ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/32E21B33/13E21B43/26E21B43/16C09K8/506C09K8/508C09K8/518
CPCC09K8/506C09K8/508C09K8/518C09K8/86C09K8/88C09K8/94E21B33/13E21B43/164E21B43/26E21B43/32
Inventor 赵仁凤
Owner 四川洁能锐思石油技术有限公司
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