Manufacturing method for manmade rock sample for simulating real form of hydraulic fracturing crack

A technology of hydraulic fracturing and production methods, which is applied in the fields of earthwork drilling, data processing application, measurement, etc. It can solve the problem that the strength of slabs cannot reach the interaction between fracturing construction and formation pressure, the inability to obtain artificial rock samples, and the deviation of mechanical properties And other issues

CN110388201AInactive Publication Date: 2019-10-29SOUTHWEST PETROLEUM UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2019-10-29
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a manufacturing method for a manmade rock sample for simulating the real form of a hydraulic fracturing crack. An original square rock plate is manufactured through an underground rock core or same-layer-position outcrop rock of an oil gas reservoir section; the rock plate is split in the length direction through a rock plate splitting device, and a three-dimensional laserscanner is used for obtaining split rock sample surface rough feature data; the rock sample surface roughness coefficient after splitting is calculated, and a pair of split rock samples capable of most representing the reservoir hydraulic fracturing crack surface feature are selected according to the roughness coefficient; according to the surface roughness feature data, a 3D printer is used for manufacturing a manmade rock sample manufacturing die; manmade rock sample manufacturing materials are prepared according to reservoir section rock mineral components, and a manmade rock sample for simulating the real form of the hydraulic fracturing crack is formed through pressing. According to the manufacturing method, the principle is simple, adopted equipment facilitates machining and manufacturing, rock samples consistent to reservoir rock mineral in component and real and uniform in surface rough feature can be manufactured in batches, and testing is conveniently conducted.
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Description

technical field

[0001] The invention relates to the technical field of oil and gas production enhancement and reformation, in particular to a method for making artificial rock samples for simulating the real shape of hydraulic fracturing fractures. Background technique

[0002] Hydraulic fracturing is the main measure for increasing production of oil and gas reservoirs. During construction, fracturing fluid with relatively high viscosity is squeezed into the oil and gas reservoir through the wellbore. When the injection rate of fracturing fluid exceeds the absorption capacity of the reservoir, it will High pressure is formed on the reservoir, and when this pressure exceeds the fracture pressure of the reservoir rock near the bottom of the well, the reservoir rock will be pushed apart and fractures will be generated. The rock is formed by the mutual bonding of various mineral particles and cement, and hydraulic fracturing fractures mainly extend along the part of the cement w...

Examples

Embodiment Construction

[0062] The present invention will be further described below in conjunction with accompanying drawing and example.

[0063] A method for making artificial rock samples for simulating the real shape of hydraulic fracturing fractures, the main steps are as follows:

[0064] Make the original square rock slab 1 using the downhole core of the oil and gas reservoir section or outcrop rock in the same layer; prefabricate the scratch 2-1 in the middle of the original square rock slab 1; use the rock slab splitting device 3 to split the square rock with the prefabricated scratch Plate 2, and use a three-dimensional laser scanner to obtain the surface roughness morphology data of rock sample 4 after splitting; calculate the surface roughness coefficient JRC of rock sample 4 after splitting, and select a pair that best represents the reservoir according to the roughness coefficient JRC The split rock sample 4 of the hydraulic fracturing fracture surface morphology; the selected split ro...