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A method for evaluating formation conditions of complex fracturing fractures in tight reservoirs

A tight reservoir and fracturing technology, which is applied in earthwork drilling, wellbore/well components, instruments, etc., can solve the problems of small model scale, long experiment period, and low repeatability, and achieve high evaluation efficiency, good reproducibility

Pending Publication Date: 2018-12-11
RES INST OF PETROLEUM ENG SHENGLI OIL FIELD SINOPEC +1
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Problems solved by technology

Traditional physical simulation experiments can only use small-scale cores to simulate similar materials to evaluate the formation conditions of complex fracturing fractures. During the experiment, the model scale is small, the boundary effect is obvious, and the error is large, and only a relatively single Influencing factors, long experimental cycle and low repeatability

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  • A method for evaluating formation conditions of complex fracturing fractures in tight reservoirs
  • A method for evaluating formation conditions of complex fracturing fractures in tight reservoirs
  • A method for evaluating formation conditions of complex fracturing fractures in tight reservoirs

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Embodiment Construction

[0033] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0034] A method for evaluating the formation conditions of complex fracturing fractures in tight reservoirs of the present invention is characterized in that it comprises the following steps:

[0035] Step 1, establishing a geomechanical model of the reservoir to be fractured, such as figure 1 , including determining the geometric dimensions of the geomechanics model in the X, Y, and Z directions. The X direction is 150m long, the Y direction is 150m long, and the Z direction is 15m long. The thickness of the target layer 1 is determined to be 5m, and the upper interlayer 2 and the lower interlayer The thickness of 3 is 5m, and it is determined that the fracturing construction wellbore 4 is located in the middle of the model and parallel to the Z axis.

[0036] Step 2, assign values ​​to the lithological parameters and physical parameters of the targ...

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Abstract

The invention discloses a method for evaluating formation conditions of complex fracturing fractures in tight reservoirs. This method takes the calculated fracture complexity index as a threshold value, and evaluates the effects of geo-stress difference, elastic parameters of target bed and interlayer, target bed thickness, porosity and permeability characteristics of target bed, operation displacement and fracturing fluid properties on the formation conditions of complex fracturing fractures. The method can clearly and intuitively give the three-dimensional spatial morphology of the whole process of the complex fracturing fracture from initiation to extension, the key influencing factors of fracturing complexity are analyzed one by one, good repeatability and high evaluation efficiency are exhibited, accurate identification of natural geomechanical conditions and artificial operation conditions in fracturing process are realized, and the method can effectively guide in-situ fracturingdesign, especially suitable for evaluation of complex fracture formation conditions in fracturing reconstruction of tight reservoirs with poor physical properties, low permeability and low natural productivity.

Description

technical field [0001] The invention belongs to the technical field of oil and gas development, and relates to hydraulic fracturing design of low-permeability tight oil reservoirs, three-dimensional spatial extension control of hydraulic fracturing fractures, and a method for evaluating the complexity of hydraulic fracturing fractures, in particular to a complex fracturing method for tight reservoirs Methods for the assessment of crack formation conditions. Background technique [0002] Due to poor reservoir physical properties, low permeability and low natural productivity in low-permeability oilfields, reservoir fracturing must be carried out. Conventional fracturing can only form symmetrical double-wing fractures, which can achieve better stimulation effects in conventional oil and gas reservoirs with good reservoir properties, but cannot fully meet the demand for stimulation in thin interbedded and low-permeability oil and gas reservoirs. If complex fractures can be ope...

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Application Information

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IPC IPC(8): G06F17/50E21B49/00
CPCE21B49/00G06F30/20
Inventor 李明陈勇张潦源张子麟黄波王华李连崇姚鲁建牟文强
Owner RES INST OF PETROLEUM ENG SHENGLI OIL FIELD SINOPEC
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