Re-fracturing method for oil, gas and water wells

A technology of repeated fracturing and oil and gas, which is applied in the direction of earthwork drilling, wellbore/well components, production fluids, etc. It can solve the problems of limited equipment power, difficulty in high and stable production, and loss of function, so as to improve production efficiency and save Processes, Realization of Reuse and Transformation Effects

Active Publication Date: 2016-04-20
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0006] For oil, gas, and water wells after hydraulic fracturing, due to the limitation of fracturing technology, materials, equipment and tools, the scale is not small, the selection of materials is improper, and the power of equipment is limited, etc., the conductivity of hydraulic fractures will be greatly reduced. , thus gradually losin

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  • Re-fracturing method for oil, gas and water wells
  • Re-fracturing method for oil, gas and water wells
  • Re-fracturing method for oil, gas and water wells

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[0030] The present invention will be further described below in conjunction with the drawings. In the embodiment shown in the drawings, a fractured casing-completed horizontal well 1 is taken as an example to describe the method for repeated fracturing of oil, gas and water wells according to the present invention in detail.

[0031] figure 1 Shows oil, gas and water well 1 that has been fractured. The figure shows a horizontal well 1 completed with a fractured casing. The relevant conditions are as follows: vertical depth of 2000m, sounding depth of 2840m, horizontal well section of 600m long, and completed casing with an outer diameter of Φ139.7mm. well. The physical characteristics of the reservoir where the fracturing section is located are as follows: low porosity, low permeability, high oil saturation, fracturing is used to reform and put into production, horizontal well section fracturing 5 (such as figure 1 As shown), the formation fracture pressure is 44MPa, the fractur...

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Abstract

The invention provides a re-fracturing method for oil, gas and water wells and belongs to the field of oil and gas exploration. The method comprises steps of preparing: ensuring a downhole casing of a fracturing section of an oil, gas and water well is in normal operating state; sealing: sealing at least part of old fractures in the oil, gas and water well; re-fracturing: re-fracturing the oil, gas and water well at the fracturing section to generate new fractures. The method forms a sealing and fracturing technique, old fractures are sealed in long time or preferably temporarily sealed through a determination device and a sealing agent, and new fractures are then made by pressing in other directions of a formation by a hydraulic fracturing process so as to reform a reservoir.

Description

Technical field [0001] The invention relates to the field of oil and gas exploitation, in particular to a method for repeated fracturing of oil and gas wells. Background technique [0002] Due to the poor physical properties of the reservoir, the production of oil wells in low-permeability oil and gas reservoirs is usually low, and due to the complex pore structure and abnormal seepage state, the development characteristics of their oil fields are very different from those of medium-high permeability oil reservoirs, even in comparison. A qualitative change has taken place. [0003] The development of low-permeability oil fields has the following basic characteristics: (1) The natural productivity of oil wells is low, and it has industrial production value after fracturing; (2) The seepage law does not follow Darcy's law and has a starting pressure gradient; (3) Natural energy is small, Pressure and production decline rapidly, and the primary recovery rate is low; (4) The fluid pro...

Claims

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Application Information

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IPC IPC(8): E21B43/26
Inventor 曾义金曲海冯江鹏侯君孔令军周林波
Owner CHINA PETROLEUM & CHEM CORP
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