A simulation experiment system for staged fracturing or synchronous fracturing of horizontal wells

Abstract

The invention provides a simulation experiment system for staged fracturing or simultaneous fracturing of horizontal wells. The system is used for performing fracturing simulation on a cubic artificial rock sample and comprises fracturing simulation assemblies, stress loading devices and fracture monitoring devices; each fracturing simulation assembly comprises a simulation wellbore, a liquid injection pipe and a position adjusting device; the simulation wellbores are located inside the artificial rock sample; the liquid injection pipes are located in the simulation wellbores; and at least two simulation perforations which are equal in number and different in position are formed in each simulation wellbore and each liquid injection pipe. Positions of the liquid injection pipes are controlled by the position adjusting devices, the communicating sequence of the simulation perforations in different fracturing sections is realized, and the different fracturing sections are fractured respectively. The simultaneous fracturing process of the two horizontal wells can be simulated by the two fracturing simulation assemblies. The simulation experiment system can simulate interference phenomena among fractures during staged fracturing of the horizontal wells or simultaneous fracturing of the two horizontal wells, and an experimental method is provided for understanding of hydraulic fracture propagation rules and fracture shapes.

Description

technical field [0001] The invention relates to a physical simulation experiment technology of true triaxial hydraulic fracturing crack initiation and expansion law, in particular to a horizontal well staged fracturing or synchronous fracturing simulation experiment system. Background technique [0002] Hydraulic fracturing is one of the key technologies for oil and gas field stimulation. With the exploitation of unconventional oil and gas resources represented by shale gas and tight oil, the staged and clustered fracturing technology of horizontal wells has been applied on a large scale. In recent years, new technologies such as multi-well simultaneous fracturing have emerged, which have greatly improved the effect of reservoir stimulation. Horizontal well staged fracturing refers to performing staged fracturing on strata at different positions in the horizontal well section according to the physical properties of the reservoir, and using multiple fracturing stages to incr...

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Problems solved by technology

[0004] But in present research mainly there are following two problems: 1) the silent breaker slurry that the method in the patent of invention (CN 104563993 A) adopts is to form solid process to squeeze rock sample to produce crack, promptly the effect to crack The force is only concentrated at the fracture formation point, and does not move with the fracture expansion, so it is impossible to study the influence of fluid on the fracture formation and expansion law in the process of dynamic force hydraulic fracturing; 2) and currently for staged fracturing Or there are few studies on simultaneous fracturing, and it is impossible to summarize the influence of interfracture interference of multiple fractures on fracture formation and propagation form from theoretical experiments.

Therefore, there is an essential difference between the current experimental system and the principle of hydraulic fracturing in the actual mine, and the experimental conclusions cannot provide effective guidance for mining practice

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