Visualization experiment device for simulating temporary plugging of hydraulic fractures by fiber diversion agent

Abstract

The invention relates to a visualization experiment device for simulating temporary plugging of hydraulic fractures by a fiber diversion agent. A pipeline is communicated with the upper end of a simulating shaft steel tube with the lower end sealed, the pipeline is connected with a first high-pressure plunger pump, and the first high-pressure plunger pump is communicated with a liquid storage tank. The pipeline is connected with a fiber adding device through a branch pipeline, and the fiber adding device is connected with a second high-pressure plunger pump. Through holes are formed in the pipe walls on the two sides of the simulating shaft steel tube respectively, a connected body is fixed to the position corresponding to the through hole in each side, the first ends of the two connecting bodies are connected with the side wall of the simulating shaft steel tube in a sealed mode, the second end of the connecting body on each side is connected with a visualization hydraulic fracture simulating device in a sealed mode. The hydraulic fractures are formed in the end faces, connected with the second ends of the connecting bodies, of the visualization hydraulic fracture simulating devices, and liquid flow channels are formed in the connecting bodies. The visualization experiment device is simple in structure and convenient to operate, and technicians can visually observe the temporary plugging depth, the form and other information and the plugging effect of temporary plugging of hydraulic fractures by the fiber diversion agent.

Description

technical field [0001] The invention relates to a simulation experiment device, in particular to a visualization experiment device for simulating a fiber diverting agent to temporarily plug hydraulic cracks. Background technique [0002] Production stimulation of ultra-deep, high-temperature fractured and thick sandstone reservoirs is a worldwide problem. This type of reservoir has the characteristics of deep burial, high formation pressure, high formation temperature, large reservoir thickness span, and high-angle fracture development. The well construction period is long and the cost is high, and single well stimulation is required to achieve efficient development. [0003] Over the years, technical personnel have carried out a large number of laboratory experiments and studies on the mechanism of production stimulation and reconstruction based on the geological characteristics of the block such as high temperature and high pressure, large thickness, deep burial, and devel...

AI Technical Summary

Problems solved by technology

[0004] The difficulties in increasing the volume of reservoir stimulation in this block are mainly manifested in: (1) natural reservoir fractures are well developed (mostly high-angle fractures), the opening and expansion of ultra-deep well fracturing fractures are not clear, and stimulation stimulation is not well targeted. layer transformation small

(2) Longitudinal layered fracturing in extremely thick layers is difficult and risky; how to adopt new technology or new vertical layered technology in order to improve the vertical producing degree of reservoirs and increase the stimulated volume is one of the difficulties in block stimulation

This technology relies on new materials, saves tool costs, reduces engineering risks, and creates conditions for later downhole operations. The field test has a significant effect on increasing production, but it lacks the understanding of the temporary plugging of hydraulic fractures by fiber diverting agents, and the volumetric acid fracturing process parameters Optimization lacks pertinence

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