Method for temporary-plugging and turning fracturing by using shear thickening fluid
A liquid and fracturing technology, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of low fracturing efficiency, less horizontal and vertical expansion, and single fracture network shape, so as to reduce damage and improve Yield, good shear thickening effect
Active Publication Date: 2018-10-02
XI'AN PETROLEUM UNIVERSITY
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Problems solved by technology
The main disadvantage of the current conventional hydraulic fracturing technology is that it is often difficult to press out multi-level complex fracture networks in oil-gas-rich reservoirs. Most of the fracture networks formed have a single shape and less horizontal and vertical expansion. In the process, only one fracture can be opened, which has almost no effect on reservoir stimulation, and the fracturing efficiency is very low, which makes it difficult for oil and gas to migrate and produce, and the output after fracturing is not significantly improved
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[0019] The technical solution of the present invention will be further elaborated below by way of enumerating the embodiments of the Chang 6 Block in Changqing Oilfield, but the present invention is not limited to the embodiments enumerated below.
[0020] refer to figure 1 , a method for temporarily plugging and diverting fracturing using shear thickening fluid, comprising the following steps:
[0021] Step 1: Prepare shear thickening liquid STF;
[0022] First prepare the shear thickening liquid STF, mix the dispersed phase PEG200, PEG400, and light light condensate oil (viscosity is 45.7mPa.s at room temperature 25°) according to the ratio of 4:2:1, and then use magnetic force combined with ultrasonic The mixer will disperse the medium nano sio 2 (650nm), graphene, and carbon nanotubes are uniformly mixed with the dispersed phase at a ratio of solid phase content of 57%: 1%: 1%, and the prepared liquid is left in a vacuum oven for 48 hours until the bubbles in the liquid ...
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The invention provides a method for temporary-plugging and turning fracturing by using shear thickening fluid. The method comprises the following steps that 1, shear thickening fluid (STF) is prepared; 2, a coiled tubing is used for slowly transporting the STFinto a crack slowly after a packer seals the main layer section to be constructed; 3, When the STF is transported to the crack, a ground surface high-pressure pipeline is used for pumping the fracturing fluid into a well, and the pumping pressure of the fracturing fluid is adjusted and increased step by step, so that pressure is build, acrack is formed, and then a novel complex crack network is formed in the stratum. According to the method for temporary-plugging and turning fracturing by using the shear thickening fluid, the STF isfirstly injected into the stratum, and a temporary plugging effect is formed in the process of fracturing, so that fracturing direction of fracturing fluid is changed, the novel complex crack networkis formed, and the reconstruction the effect of a reservoir is greatly improved.
Description
technical field [0001] The invention relates to the field of petroleum engineering hydraulic fracturing, in particular to a method for temporarily plugging and diverting fracturing by using shear thickening liquid. Background technique [0002] Since conventional oil and gas resources have been unable to meet social needs in recent years, people are increasingly intensifying the development of unconventional reservoirs. Hydraulic fracturing technology has become a very effective means to develop oil and gas resources in unconventional reservoirs. However, in order to form sand-filled fractures with high conductivity in the reservoir and greatly increase the production of oil and gas wells, it is necessary to press out multiple fractures in the formation. The fractures form a complex multi-level fracture network. The main disadvantage of the current conventional hydraulic fracturing technology is that it is often difficult to press out multi-level complex fracture networks i...
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IPC IPC(8): E21B43/26
CPCE21B43/26
Inventor 周德胜王海洋符洋王鑫
Owner XI'AN PETROLEUM UNIVERSITY