Fracturing string friction resistance testing method based on virtual parallel equal differential pressure method
A technology for fracturing strings and testing methods, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as inability to test friction and resistance, and achieve optimized construction displacement, high accuracy, and predictive accuracy Improved effect
Pending Publication Date: 2020-12-11
SHAANXI YANCHANG PETROLEUM GRP
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Problems solved by technology
[0005] In order to solve the above-mentioned technical problems, the present invention provides a method for testing the friction of fracturing pipe strings by the virtual parallel equal differential pressure method. The on-site pipe string and the indoor test pipe string are connected in virtual parallel to obtain the indoor simulated displacement, and the indoor fluid friction under the simulated displacement is tested to obtain the fluid friction under the field working conditions, which greatly simplifies the on-site fluid friction test procedure
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Embodiment 1
[0042] In this example, take the design of well YYP-1 fracturing construction plan as an example, the well is currently 2542m deep, and the design displacement is 12m 3 / min, the fracturing pipeline, that is, the inner diameter of the on-site construction pipe string is 121mm. The wellhead pressure is predicted through the fracturing fluid friction test and the type of fracturing fluid to be selected is determined. Wellhead pressure = fluid friction + near-well friction + Fracture Extension Pressure - Liquid Gravity.
[0043] The wellhead pressure limit is 68MPa, of which, near wellbore friction + fracture extension pressure - liquid gravity is 49MPa, the selected fracturing fluid friction must be less than 19MPa, otherwise the pump will be shut down due to overpressure during construction;
[0044] In order to obtain the friction resistance of the field construction pipe string by using the laboratory test method, the principle is as follows:
[0045] Because the potential e...
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The invention relates to a fluid friction testing method in a hydraulic fracturing process, in particular to a fracturing string friction resistance testing method based on a virtual parallel equal differential pressure method. The fracturing string friction resistance testing method based on the virtual parallel equal differential pressure method comprises the following three steps: (1) establishing a relational expression of flow, pipe diameter and friction resistance coefficient among branch pipes; (2) solving an initial value; and (3) solving the final value of each branch pipe parameter under the parallel pipeline, wherein matlab programming calculation is used in the process. The method has the three advantages that 1, theoretical formula derivation and indoor experiment testing arecombined, the method that the differential pressure of the parallel pipelines is equal is adopted, the distribution displacement of the two parallel pipelines is solved, the friction resistance of onebranch under the simulated displacement is tested indoors, and then the pipe flow friction resistance of the other branch can be obtained; 2, compared with the conventional methods such as equal shearing rate, equal flow velocity and similar Reynolds number, the method is high in accuracy and more convenient; and 3, compared with the existing flow velocity equal friction prediction, the accuracyis improved by more than 50%, and the error is controlled within 10%.
Description
technical field [0001] The invention relates to a method for testing fluid friction resistance in a hydraulic fracturing process, in particular to a method for testing friction resistance of a fracturing pipe string using a virtual parallel equal differential pressure method. Background technique [0002] In recent years, the international oil and energy pattern has been continuously adjusted. Unconventional energy has become an important resource for energy replacement. The exploitation of tight oil and gas and shale oil and gas has brought new development directions to the transformation of domestic energy structure. Conventional fracturing technology cannot meet the mining requirements, and new development methods must be sought to utilize recoverable resource reserves. [0003] Volume fracturing is accompanied by the exploitation of unconventional oil and gas. It is mainly an effective exploitation method proposed for unconventional reservoirs such as shale oil and gas a...
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Login to View More IPC IPC(8): G06F30/28G06F30/13G06F113/08G06F113/14G06F119/14
CPCG06F30/28G06F30/13G06F2113/08G06F2113/14G06F2119/14
Inventor 张锋三杨洪吴金桥段玉秀朱容婷任婷高志亮郭庆罗攀刘安邦穆景福刘飞杨博
Owner SHAANXI YANCHANG PETROLEUM GRP