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Fracturing method for comprehensively controlling fracture height

A technology of fracture height and comprehensive control, applied in earth-moving drilling, production of fluids, wellbore/well components, etc., can solve the problem of no fracturing method, and achieve the effect of good fracturing effect, reduced dosage and flexible adjustment

Inactive Publication Date: 2013-05-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] At present, in the reconstruction of oil and gas reservoirs where the target reservoir is thin and the stress difference between the reservoir and the interlayer is small, there is no effective fracturing method for comprehensively controlling the fracture height.

Method used

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  • Fracturing method for comprehensively controlling fracture height
  • Fracturing method for comprehensively controlling fracture height

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0047] Example: Well A

[0048] The well is an evaluation well, with a perforated section of 2192.0-2196.2m, a total of 4.2m, and 1 oil layer. There is a water layer in the upper 16m of the oil layer, and the maximum well deviation is 34.4°. In order to effectively control the fracture height and improve the effective fracture conductivity, the hydraulic fracturing process of slug sand addition + variable displacement + up and down diverting agent + ceramsite with different particle sizes + clean fracturing fluid is designed.

[0049] The specific method is:

[0050] (1) Through the calculation of the minimum horizontal principal stress, it is determined that the stress difference between the oil layer and the upper and lower interlayers is 1.3MPa and 1.6MPa respectively, which cannot form an effective shield, and the fracture height is difficult to control; the thickness of the oil layer is 4.2m, simulated by fracturing software , it is determined to add 3 tons of upper and...

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Abstract

The invention discloses a fracturing method for comprehensively controlling fracture height. The method includes: injecting reversing agent to form an artificial isolating layer, using clean fracturing fluid, controlling construction scale, designing construction pumping programs of variable displacement and low displacement, using a combination of supporting agent with different grain sizes, and adjusting the pumping programs according to construction pressure monitoring results. The fracturing method for comprehensively controlling fracture height is simple in process, convenient to operate, evident in construction effect, capable of being widely used in renovation construction of oil-gas reservoirs with a thin target reservoir stratum and small stress difference between the reservoir stratum and the isolating layer, and capable of well controlling vertical extension of fractures so as to avoid ineffective extension of a communication water layer, a gas layer or in the vertical direction, lower using amount of the fracturing fluid and the supporting agent, reduce cost of fracturing construction and improve effect of fracturing modification yield increase.

Description

technical field [0001] The invention relates to the field of oil production, and furthermore, relates to a fracturing method for comprehensively controlling the height of fractures. Background technique [0002] Fracturing is an important measure for low-permeability reservoir stimulation at home and abroad, and controlling the fracture height in the production layer is the key to successful fracturing. [0003] The conventional fracture height control technology is to select and use the dense muddy interlayer above and below the production layer, construction displacement, fracturing fluid viscosity and density to control the fracture height. However, when the production layer is very thin or the barrier layer is a weak stress layer, fractures may penetrate the production layer and enter the barrier layer, causing the fracture height to be out of control, thus failing to meet the design requirements and affecting the fracturing effect. [0004] For the control of fracture ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26
Inventor 张波薛承瑾蒋廷学张旭东李洪春王宝峰赵晓姚奕明卫然周林波封卫强
Owner CHINA PETROLEUM & CHEM CORP
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