Experimental device and method for simulating single-crack flowback after shale gas fracturing
A single-fracture flowback and experimental device technology, applied in the direction of measurement devices, instruments, suspensions and porous material analysis, etc., can solve the problem of not considering the closure pressure, not considering the pressure drop proppant return flow settlement law, and not being able to simulate the fracture width and closing pressure changes, etc., to achieve the effect of comprehensive consideration and simple coring
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[0044] Example 1:
[0045] An experimental device for simulating single-fracture flowback after shale gas pressure, which includes a pump group, a device main body, a hydraulic and temperature control device, a tail monitoring device, a waste liquid treatment device, and the device main body and the tail monitoring device are connected to a computer; the device main body Primarily an improved core holder such as figure 2 , image 3 shown, is also an annular diversion chamber; the improved core holder includes hydraulic and temperature control devices, 7 holes on the side to control the temperature in the cavity, 8 holes apply hydraulic pressure and monitor internal pressure, 6 holes are used to monitor The change of the crack width during the experiment; the side of the diversion chamber cavity 11 is wrapped with a rubber ring 12, and the rightmost end of the rubber ring is surrounded by a protruding rubber ring 13, which can fix the position of the core, and the non-rubber ...
Example Embodiment
[0053] Example 2:
[0054] An experimental device for single-fracture flowback after simulating shale gas pressure as described in Example 1, the difference is that the experimental device for single-fracture flowback after simulating shale gas pressure also includes hydraulic and temperature control devices, a computer , tail monitoring device, waste liquid treatment device. The hydraulic pressure and temperature control device, pressure gauge and displacement gauge are connected with the computer.
[0055] The hydraulic medium is water-glycol hydraulic oil. The fluid medium is field fracturing fluid. The sand production monitoring device is a sound wave sand production monitoring device. The pump group can adjust the flow steplessly and can withstand a certain pressure.
Example Embodiment
[0056] Example 3:
[0057] An experimental method for single-fracture flowback after simulating shale gas pressure using the device described in Example 2, comprising the following steps:
[0058] (1) First dry and weigh the marble core, the mass is m 1 ;
[0059] (2) Spread proppants of different particle sizes in the designated area of the fracture according to a certain sand-laying concentration to achieve the effective fracture width of the fracture and simulate the settling law of proppant of different particle sizes during fracturing operation. The total amount of proppant added is The amount divided by the contact area of the crack is the initial effective crack width of the crack;
[0060] (3) The core with the proppant laid on the core rubber sleeve is aligned and fixed according to the scale, and then inserted into the annular diversion chamber according to the scale of the annular diversion chamber, until the rightmost end cannot move, and the sealing clamping...
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