CN-224231589-U - Shale weak surface sliding friction characteristic simulation experiment device

CN224231589UCN 224231589 UCN224231589 UCN 224231589UCN-224231589-U

Abstract

The utility model discloses a shale weak surface sliding friction characteristic simulation experiment device, which comprises a heating furnace, experimental shale and an experimental analysis computer, wherein the experimental shale is formed by overlapping an upper rock block and a lower rock block, the overlapping surface is an inclined plane simulating a weak surface, a liquid supply hole is arranged on the upper rock block and directly reaches the inclined plane, an electric heating wire is arranged in the heating furnace and is connected with a temperature control circuit of the experimental analysis computer, the experimental analysis experiment on the shale weak surface sliding friction characteristic can be conveniently realized through the device, the temperature control circuit of the device adopts a direct current output of a full-wave rectifying circuit to be connected with a silicon controlled rectifier as a switch, and the circuit is simple and reliable to control.

Inventors

LI XIAOMING
WANG YIRAN
ZHANG YU
KONG LINGTAO
PAN JIANXU
MA LIHONG
WANG YARONG
XU RUI
XU XIAOBIN
ZHANG HAISONG

Assignees

华北科技学院(中国煤矿安全技术培训中心)

Dates

Publication Date: 20260512
Application Date: 20250411

Claims (5)

1. The utility model provides a shale weak surface sliding friction characteristic simulation experiment device, including heating furnace (1), experimental shale (2) and experimental analysis computer (3), experimental shale is that two upper and lower page rock pieces overlap each other and become, overlap face is inclined plane (201) of simulation weak surface, be equipped with on the upper page rock piece and supply liquid hole (202), supply liquid hole direct inclined plane (201), be provided with electric heating wire (101) in heating furnace (1), temperature control circuit (301) of experimental analysis computer (3) are connected to electric heating wire (101), characterized in that, heating furnace (1) include a sealed metal drum (102), around the lateral wall is provided with electric insulation insulating layer (103) in sealed metal drum, electric insulation insulating layer (103) parcel is a heating cylinder (104), be provided with inwards binding off (104-1) about heating cylinder (104) inside wall winding have electric heating wire (101) in heating cylinder (104) hug closely from top to bottom and be provided with plastic positioning sleeve (105), plastic positioning sleeve (105) crouch on metal drum (102-1) and heat conduction material (106-106) are filled between sealing cylinder (104) and powder sealing cylinder (104), the experimental shale (2) is placed in the middle section in the plastic positioning sleeve (105), an upper pressing column (4) and a lower pressing column (5) are respectively arranged on the upper end face and the lower end face of the experimental shale (2) in the plastic positioning sleeve (105), the lower pressing column (5) is arranged on a closed metal cylinder bottom plate (102-1), a pressurizing column (6) is arranged between the upper pressing column (4) arranged on the upper end face of the experimental shale (2) and the closed metal cylinder top cover (102-2), a pressurizing mechanism is arranged on the closed metal cylinder top cover (102-2), a pressurizing rod of the pressurizing mechanism is propped against the pressurizing column (6), a liquid supply channel (401) is arranged on the upper pressing column (4), the lower port of the liquid supply channel (401) is communicated with a liquid supply hole (202) on the experimental shale (2), the upper port of the liquid supply channel (401) is connected with a liquid supply pump (8) through a pipeline (7) penetrating through the closed metal cylinder top cover (102-2), a pressure sensor (9), a temperature sensor (10) and a displacement sensor (11) are arranged on an inclined plane (201) of the experimental shale (2), a displacement sensor (11) is arranged on the upper pressure sensor (9) and a displacement sensor (11) is arranged on the upper pressure sensor (4) and the pressure sensor (11), the led-out signal wire passes through the top cover (102-2) of the closed metal cylinder and is connected with the experimental analysis computer (3).
2. The experimental device according to claim 1, characterized in that the powdered thermally conductive material (106) is boron nitride powder.
3. The experimental device according to claim 1, wherein the pressing mechanism comprises nuts (12) symmetrically welded and fixed on two sides of the center of the upper end face of the top cover of the closed metal cylinder, a screw rod (13) is screwed on the nuts (12), and the screw rod (13) is used as an adjustable pressing rod to prop against the pressing column (6).
4. The experimental device according to claim 1, characterized in that the plastic positioning sleeve (105) is a plastic sleeve or a copper tube sleeve.
5. The experimental device according to claim 1, wherein the temperature control circuit (301) comprises a controllable switch (301-1), the electric heating wire (101) is connected with an alternating current power supply (AC) through the controllable switch, the controllable switch (301-1) comprises a full-wave rectifying circuit (D1-D5), the alternating current power supply forms a loop through the electric heating wire (101) and the full-wave rectifying circuit (D1-D5), the alternating current input of the full-wave rectifying circuit (D1-D5) is connected with the electric heating wire (101) in series, the direct current positive electrode output of the full-wave rectifying circuit (D1-D5) is connected with the positive electrode of a Silicon Controlled Rectifier (SCR), the negative electrode of the Silicon Controlled Rectifier (SCR) is connected with the direct current negative electrode output of the full-wave rectifying circuit (D1-D5), the control electrode of the Silicon Controlled Rectifier (SCR) is connected with a temperature sensing circuit (301-2), the temperature sensing circuit is connected with the temperature sensing circuit, the temperature sensing circuit controls the high or low voltage level of the Silicon Controlled Rectifier (SCR), and the high voltage level of the Silicon Controlled Rectifier (SCR) is very low voltage level controlled; When the Silicon Controlled Rectifier (SCR) is turned on, the positive and negative poles of the full-wave rectifying circuits (D1-D5) are short-circuited, and an alternating current power supply is communicated with the electric heating wire (101) through the full-wave rectifying circuits (D1-D5) for heating; When the Silicon Controlled Rectifier (SCR) is turned off, the positive and negative electrode outputs of the full-wave rectifying circuits (D1-D5) are disconnected, and the alternating current power supply and the electric heating wire (101) are disconnected by the full-wave rectifying circuits (D1-D5).

Description

Shale weak surface sliding friction characteristic simulation experiment device Technical Field The utility model relates to a shale weak surface sliding friction characteristic simulation experiment device. Background Shale weak surface sliding initiation sleeve becomes a serious problem affecting fracturing effect in shale gas development. In view of the characteristics of extremely low permeability and low porosity of shale reservoirs, horizontal wells and volume fracturing construction means are needed during development. Along with the large-scale volumetric fracturing construction of each shale oil-gas field, if the area of the reservoir is in a high stress difference environment, geological movement is frequent, and bedding, lithology interfaces, natural cracks and faults develop. In the hydraulic fracturing process of the shale gas horizontal well, fracturing fluid pumped into the weak surface of shale enables a reservoir to generate an uneven shear stress field, net pressure in a seam is improved, the weak surface is activated, sleeve deformation phenomena caused by weak surface sliding are frequently generated, and the phenomenon that a bridge plug cannot be put into a designated position is frequently generated. The stratum shearing slip problem in the shale reservoir volume fracturing construction seriously affects the on-site construction and production, and becomes a bottleneck for restricting the development of shale oil and gas resources, so that the shale weak surface slip research is very necessary. Disclosure of Invention Aiming at the problems, the utility model aims to provide a shale weak surface sliding friction characteristic simulation experiment device. In order to achieve the above object, the present utility model is provided with: A simulated experiment device for weak surface sliding friction characteristics of shale comprises a heating furnace, experimental shale and an experimental analysis computer, wherein the experimental shale is formed by overlapping an upper page rock block and a lower page rock block, the overlapping surface is an inclined surface simulating the weak surface, a liquid supply hole is formed in the upper page rock block, the liquid supply hole is directly connected with the inclined surface, an electric heating wire is arranged in the heating furnace and connected with a temperature control circuit of the experimental analysis computer, the heating furnace comprises a closed metal cylinder, an electric insulation heat insulation layer is arranged around a side wall in the closed metal cylinder, the electric insulation heat insulation layer wraps a heating cylinder, inward closing-in is arranged on the upper side and the lower side of the heating cylinder, the electric heating wire is wound around the inner side wall of the heating cylinder, a plastic positioning sleeve is arranged in the heating cylinder in a clinging manner to the upper closing-lower closing-in manner, a plastic positioning sleeve is arranged on a bottom plate of the closed metal cylinder, powdery material is filled between the plastic positioning sleeve and the inner side wall of the heating cylinder and the upper closing-lower closing-in, the experimental shale is arranged in the middle section of the plastic positioning sleeve, an upper pressure cylinder and the lower pressure cylinder are respectively arranged on the upper end face and the lower end face of the experimental positioning sleeve, an upper pressure cylinder and a lower end face of the experimental cylinder are arranged around the side wall, an electric insulation layer is wound on the upper end face of the metal cylinder and a pressure sensor is arranged on the upper end face of the metal cylinder, a pressure sensor is arranged on the pressure cylinder, and a pressure sensor is arranged on the pressure sensor, and a pressure sensor is in a pressure channel and connected to the pressure sensor The signal wires of the temperature sensor and the displacement sensor are led out through channels arranged on the upper pressure column and the pressure applying column, and the led-out signal wires penetrate through the top cover of the closed metal cylinder to be connected with an experiment analysis computer. The scheme is further that the powdery heat conducting material is boron nitride powder. The scheme is that the pressing mechanism comprises nuts symmetrically welded and fixed on two sides of the center of the upper end face of the top cover of the closed metal cylinder, a screw rod is screwed on the nuts, and the screw rod is used as an adjustable pressing rod to prop against the pressing column. The proposal is that the plastic positioning sleeve is a plastic sleeve or a copper pipe sleeve. The temperature control circuit comprises a controllable switch, wherein the electric heating wire is connected with an alternating current power supply through the controllable switch, the controllable switch comprises a full-wave