Preparing method of fragmental rock artificial core compacted after fluid overpressure releasing
A technology for artificial rock core and clastic rock, applied in the field of preparation of clastic rock artificial core
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[0019] Please refer to figure 1 , the embodiment of the present invention provides a kind of preparation method of the clastic rock artificial core that experiences fluid overpressure release and compaction again, comprises the following steps:
[0020] Step S1, weighing quartz sand, plagioclase powder, potassium feldspar powder, and white cement for mixing, and stirring evenly to obtain artificial core raw materials; wherein the mass percentages of quartz sand, plagioclase powder, potassium feldspar powder, and white cement in the artificial core raw materials are sequentially 60% to 80%, 5% to 15%, 5% to 15%, 5% to 15%.
[0021] In step S2, the artificial core material obtained in step S1 is placed in the core diagenesis simulation system, and the overburden pressure and pore pressure in the core diagenesis simulation system are raised to 23.5-94.0 MPa and 13.4-70.0 MPa respectively, so that the core diagenesis simulation system is The overpressure state is maintained for 0...
Embodiment 1
[0025] In terms of mass percentage, weigh 70% quartz sand, 10% plagioclase powder, 10% potassium feldspar powder, and 10% high-standard white cement for mixing, and stir evenly to obtain artificial core raw materials;
[0026] Put the artificial core material in the core diagenesis simulation system, and slowly increase the overburden pressure and pore pressure to 23.5MPa and 13.4MPa respectively, so that the core diagenesis simulation system is in an overpressure state and keep it for 1h; the overburden pressure is 23.5MPa to simulate the actual The static rock pressure when the formation depth is 1000m, the pore pressure is 13.4MPa, and the fluid pressure corresponding to the pressure coefficient 1.3 under the overpressure state of the formation depth of 1000m is simulated;
[0027] The pore pressure was removed, and the overburden pressure was maintained at 23.5 MPa and pressed for 5 hours to obtain an artificial core of clastic rock that was compacted after the fluid overpr...
Embodiment 2
[0029] In terms of mass percentage, weigh 65% quartz sand, 12% plagioclase powder, 7% potassium feldspar powder, and 6% high-standard white cement for mixing, and stir evenly to obtain artificial core raw materials;
[0030] Put the artificial core material in the core diagenesis simulation system, and slowly increase the overburden pressure and pore pressure to 23.5MPa and 15.5MPa respectively, so that the core diagenesis simulation system is in an overpressure state and keep it for 1h; the overburden pressure is 23.5MPa to simulate the actual The static rock pressure when the formation depth is 1000m, the pore pressure is 15.5MPa, and the fluid pressure corresponding to the pressure coefficient of 1.5 is simulated under the overpressure state of the formation depth of 1000m;
[0031] The pore pressure was removed, and the overburden pressure was maintained at 23.5 MPa and pressed for 4.5 hours to obtain an artificial core of clastic rock that had undergone fluid overpressure ...
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