CN112377103A - Pressure feed type horizontal directional drilling engineering geological exploration hydraulic fracturing test device - Google Patents
Pressure feed type horizontal directional drilling engineering geological exploration hydraulic fracturing test device Download PDFInfo
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- CN112377103A CN112377103A CN202011189431.9A CN202011189431A CN112377103A CN 112377103 A CN112377103 A CN 112377103A CN 202011189431 A CN202011189431 A CN 202011189431A CN 112377103 A CN112377103 A CN 112377103A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/046—Directional drilling horizontal drilling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/122—Multiple string packers
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B25/00—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes
- G09B25/04—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes of buildings
Abstract
A pressure-feed type horizontal directional drilling engineering geological exploration hydraulic fracturing test device comprises a sealed pressure-feed mechanism, an in-place reporting mechanism, a hydraulic fracturing mechanism, an in-hole imaging mechanism and a drilling tool assembly, wherein the drilling tool assembly drills a horizontal exploration hole in crust rock; the sealing pressure feeding mechanism feeds the device to the bottom of the hole; the hydraulic fracturing mechanism carries out a hydraulic fracturing experiment, the in-hole imaging mechanism records image information, and the sealing pressure feeding mechanism, the in-place reporting mechanism, the hydraulic fracturing mechanism and the in-hole imaging mechanism of the device can move in the drilling tool assembly, so that the drilling tool does not need to be lifted during measurement, the hydraulic fracturing and the drilling hole crack propagation information acquisition are integrated into a one-time drilling procedure, and the efficiency is improved; and during measurement, the image information of the surrounding rock mass around the drill hole can be acquired.
Description
Technical Field
The invention relates to a pressure-feed type horizontal directional drilling engineering geological exploration hydraulic fracturing test device, and belongs to the field of engineering geological exploration instruments.
Background
Geostress is a general term for the stresses present in the crust rock, more broadly, stresses within the earth.
The existing hydrofracturing method ground stress measuring device is composed of a drilling tool, a pair of expandable rubber packers and a fracturing pipe, wherein the fracturing pipe is positioned between the rubber packers, the drilling tool drills a horizontal exploration hole with a preset testing depth on a rock body, then the drilling tool is taken out and placed into the rubber packers, liquid is pumped in to enable the rubber packers to expand to the hole wall, the rubber packers and the hole wall are used for sealing a section of hole wall, then the liquid is pumped into the fracturing pipe to enable the fracturing pipe to expand, the fracturing pipe applies pressure to the hole wall until the rock body is fractured, and the magnitude and the direction of the ground stress and the change rule of the magnitude and the direction of the ground stress along the depth are determined according to; but the existing hydrofracturing method ground stress measuring device can not be applied to the ground stress measurement of long-distance horizontal exploration holes; the existing hydrofracturing method ground stress measuring device needs to take out a drilling tool from a horizontal exploration hole, so that the measuring efficiency of the long-distance horizontal exploration hole is low.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides the pressure-feed type horizontal directional drilling engineering geological exploration hydraulic fracturing test device which is suitable for long-distance horizontal exploration holes and has high ground stress measurement efficiency on the long-distance horizontal exploration holes.
The technical scheme for realizing the aim of the invention is that the pressure-feed type horizontal directional drilling engineering geological prospecting hydraulic fracturing testing device at least comprises a drilling tool assembly and a hydraulic fracturing mechanism, wherein a sealing pressure-feed mechanism, an in-place reporting mechanism and an in-hole imaging mechanism are sequentially arranged in the drilling tool assembly from top to bottom, and the hydraulic fracturing mechanism is positioned between the in-place reporting mechanism and the in-hole imaging mechanism;
the hydraulic fracturing mechanism comprises a push-pull pipe, a central rod, a push-pull valve, an upper packer, a fracturing pipe and a lower packer, wherein the push-pull pipe is arranged on the axis of the central rod, the lower part of the central rod is hollow, the push-pull valve is arranged at the hollow part of the central rod, the central rod and the push-pull valve are matched to form two closed cavities which are respectively a packer pipeline cavity close to the outer side and a fracturing pipe cavity close to the inner side, and the lower end of the push-pull valve is sequentially provided with the push-pull valve, the upper packer, the fracturing pipe and the lower;
the drilling tool assembly comprises a single-wall drill rod, a double-wall drill rod and a drill bit;
the in-place reporting mechanism comprises a suspension seat ring and a valve plug, the valve plug is arranged between the central rod and the double-wall drill rod, the outer surface of one side of the valve plug is completely attached to the central rod, the outer surface of the lower end of the other side of the valve plug is attached to the inner surface of the double-wall drill rod, and the suspension seat ring is arranged between the upper end of the valve plug and the double-wall drill rod;
the sealing pressure feeding mechanism comprises a sealing clamping plate and a sealing pad.
The technical scheme is further improved as follows: the lower end of the single-wall drill rod protrudes from the outer side part, the lower end of the double-wall drill rod sinks from the outer side part, the protruding length is consistent with the sinking depth, the protruding part of the single-wall drill rod and the side face of the sinking part of the double-wall drill rod are mutually attached, a joint is arranged at the attaching part, and a threaded hole is vertically formed in the middle of the joint.
And two water ports A, B are arranged in the double-wall drill rod, a water port A is positioned above the sealing pressure feeding mechanism, and a water port B is positioned below the sealing pressure feeding mechanism.
And the number of the sealing clamping plates is two, and the two sealing clamping plates are respectively positioned at the left end and the right end of the central tube.
And the sealing gasket is in a ring shape, the outer side surface of the sealing gasket is tightly attached to the inner surface of the double-wall drill rod, and the inner side surface of the sealing gasket is tightly attached to the outer surface of the central rod.
When the push-pull valve is pushed to the bottom by the push-pull pipe, the water inlet of the push-pull pipe corresponds to the cavity of the packer pipeline, and the water outlet of the push-pull pipe is in a blocking state; when the push-pull pipe is pulled to the top, the water outlet of the push-pull pipe corresponds to the fracturing pipe cavity, and the water inlet of the push-pull pipe is in a blocking state.
And the upper packer and the lower packer are communicated through a pipeline.
And the outer wall of the fracturing pipe is provided with at least one water gap C.
And the imaging mechanism in the hole comprises a comprehensive cable pipe, a laser transmitter and a high-definition camera.
And the laser emitter and the high-definition camera are externally provided with protective covers.
According to the technical scheme, the pressure-feed type horizontal directional drilling engineering geological exploration hydrofracturing testing device provided by the invention is composed of a sealing pressure-feed mechanism, an in-place reporting mechanism, a hydrofracturing mechanism, an in-hole imaging mechanism and a drilling tool assembly, wherein the drilling tool assembly drills a horizontal exploration hole in the crust rock; the sealed pressure feeding mechanism ensures that other mechanisms except the drilling tool assembly are pressure-fed to the bottom of the hole; the hydraulic fracturing mechanism utilizes the expansion of an upper packer and a lower packer to seal the hole wall, a water gap on a fracturing pipe is utilized to carry out a hydraulic fracturing experiment, an in-hole imaging mechanism records image information, and a sealing pressure feeding mechanism, an in-place reporting mechanism, the hydraulic fracturing mechanism and the in-hole imaging mechanism of the device are arranged in a drilling tool assembly, so that the drilling tool does not need to be lifted during measurement, the hydraulic fracturing and the drilling hole crack expansion information acquisition are integrated into a one-time drilling procedure, and the efficiency is improved; and during measurement, the image information of the surrounding rock mass around the drill hole can be acquired.
Drawings
FIG. 1 is a schematic structural diagram of a hydraulic fracturing test apparatus provided by the present invention;
FIGS. 2 to 4 are enlarged views of the parts of FIG. 1 from top to bottom;
in the figure: 1. a composite cable conduit; 2. pushing and pulling the pipe; 3. a center pole; 4. a single-wall drill pipe; 5. a joint; 6. a double-walled drill pipe; 7. a water gap A; 8. sealing the clamping plate; 9. a gasket; 10. hanging a seat ring; 11. a spring pin; 12. a water port B; 13. the valve blocks the water gap; 14. valve plugging; 15. a spring pin; 16. a drill bit; 17. a water feeding port; 18. a packer pipeline cavity; 19. a fracturing pipe cavity; 20. a push-pull valve; 21. a water outlet; 22. an upper packer; 23. fracturing the pipe; 24. a water gap C; 25. a pipeline; 26. a lower packer; 27. a protective cover; 28. the system comprises a laser transmitter and a high-definition camera; 29. a closed cavity A; 30. a closed cavity B; 31. closing off the chamber C.
The valve water blocking port 13 is a virtual description water port, and is a solid annular unique slurry channel formed in a space above the valve plug after the device is pressed and conveyed in place, slurry must flow through the water port 12 and then rushes against the valve plug 14 through the valve water blocking port 13, the pressure of the slurry rises and then falls, and the in-place reporting of the device is realized;
the spring pin 15 is a matching part of the push-pull pipe 2, so that the push-pull pipe is pulled, the push-pull pipe is arranged at the bottom in a natural state, the spring pin is contracted, and the spring pin is stretched when the push-pull pipe is pulled.
Detailed Description
The invention is further illustrated by the following figures and examples.
As shown in fig. 1 to 4, the pressure-feed type horizontal directional drilling engineering geological prospecting hydraulic fracturing testing device of the embodiment of the invention comprises a drilling tool assembly and a hydraulic fracturing mechanism, wherein a sealing pressure-feed mechanism, an in-place reporting mechanism and an in-hole imaging mechanism are sequentially arranged in the drilling tool assembly from top to bottom, and the hydraulic fracturing mechanism is positioned between the in-place reporting mechanism and the in-hole imaging mechanism;
the hydraulic fracturing mechanism comprises a push-pull pipe 2, a central rod 3, a push-pull valve 20, an upper packer 22, a fracturing pipe 23 and a lower packer 26, wherein the push-pull pipe 2 is arranged on the axis of the central rod 3, the lower part of the central rod 3 is hollow, the push-pull valve 20 is arranged in the hollow part, the central rod 3 and the push-pull valve 20 are matched to form two closed cavities, namely a cavity 18 of a packer pipeline 25 close to the outer side and a cavity 19 of the fracturing pipe 23 close to the inner side respectively, and the lower end of the push-pull valve 20 is sequentially provided with the push-pull valve 20, the upper packer 22, the fracturing pipe 23 and the lower;
the drilling assembly comprises a single-wall drill pipe 4, a double-wall drill pipe 6 and a drill bit 16; in the embodiment, the double-wall drill rod 6 is a full-hole drilling tool, and the gap between the double-wall drill rod 6 and the hole wall is less than 5mm, so that the broken rock does not have the space condition of collapse, the double-wall drill rod 6 has a certain supporting effect on the hole wall, and the damage to the drilled hole caused by the pressure and the suction effect formed by the drilled hole is avoided.
The in-place signaling mechanism comprises a hanging seat ring 10 and a valve plug 14, the valve plug 14 is arranged between the central rod 3 and the double-wall drill rod 6, the outer surface of one side of the valve plug 14 is completely attached to the central rod 3, the outer surface of the lower end of the other side of the valve plug 14 is attached to the inner surface of the double-wall drill rod 6, the hanging seat ring 10 is arranged between the upper end of the valve plug 14 and the double-wall drill rod 6, and the hanging seat ring 10 is used for supporting the valve plug 14;
the sealing pressure feeding mechanism includes a sealing clamp plate 8 and a sealing pad 9.
In this embodiment: the lower end of the single-wall drill rod 4 protrudes from the outer side part, the lower end of the double-wall drill rod 6 sinks from the outer side part, the protruding length is consistent with the sinking depth, the protruding part of the single-wall drill rod 4 is mutually attached to the side face of the sinking part of the double-wall drill rod 6, the attaching part is a connector 5, a threaded hole is vertically formed in the middle of the connector 5, and the single-wall drill rod 4 and the double-wall drill rod 6 are fixedly connected through screws.
Two water ports A7 and B12 are arranged in the double-wall drill rod 6, wherein the water port A7 is positioned above the sealing pressure feeding mechanism, and the water port B12 is positioned below the sealing pressure feeding mechanism.
And the number of the sealing clamping plates 8 is two, and the sealing clamping plates are respectively positioned at the left end and the right end of the central tube.
And the sealing gasket 9 is annular, the outer side surface of the sealing gasket 9 is tightly attached to the inner surface of the double-wall drill rod 6, and the inner side surface of the sealing gasket 9 is tightly attached to the outer surface of the central rod 3.
When the push-pull pipe 2 is pushed to the bottom by the push-pull valve 20, the water inlet 17 of the push-pull pipe 2 corresponds to the cavity 18 of the packer pipeline 25, and the water outlet 21 of the push-pull pipe 2 is in a blocking state; when the push-pull pipe 2 is pulled to the top, the lower water gap 21 of the push-pull pipe 2 corresponds to the cavity 19 of the fracturing pipe 23, and the upper water gap 17 of the push-pull pipe 2 is in a blocking state.
The spring pin 15 is a matching part of the push-pull pipe 2, so that the push-pull pipe 2 is pulled, the push-pull pipe 2 is pushed to the bottom in a natural state, the spring pin 15 contracts, and the spring pin 15 stretches when the push-pull pipe 2 is pulled.
And the upper packer 22 and the lower packer 26 communicate with each other through a line 25.
And the outer wall of the fracturing pipe 23 is provided with at least one water gap C24.
And the in-hole imaging mechanism comprises a comprehensive cable conduit 1, a laser emitter 28 and a high-definition camera 28.
And the laser emitter 28 and the high-definition camera 28 are externally provided with a protective cover 27.
Under the action of a drilling machine, a drill bit 16 drives a single-wall drill rod 4 and a double-wall drill rod 6 to be linked with the drill bit 16 to drill, the drill bit 16 is used for breaking crust rock, and the double-wall drill rod 6 is used for transmitting torque and rotating to drill.
When the preset position is reached, the drilling machine stops rotating, the drill bit 16 stops drilling, the sealing pressure feeding mechanism, the in-place signaling mechanism, the hydraulic fracturing mechanism and the in-hole imaging mechanism are integrally placed into the drill rod, then slurry or clear water is pumped into the closed cavity A29 in the double-wall drill rod 6, and under the action of water pressure, the sealing pressure feeding device, the in-place signaling mechanism, the hydraulic fracturing mechanism and the in-hole imaging mechanism integrally move forwards in the double-wall drill rod 6 until the bottom of the hole.
When the sealing pressure feeding mechanism, the in-place signaling mechanism, the hydraulic fracturing mechanism and the in-hole imaging mechanism integrally reach the bottom of the hole, the water gap A7 is located above the sealing pressure feeding mechanism, the water gap B12 is located below the sealing pressure feeding mechanism, slurry flows through the water gap of the double-wall drill rod to reach the closed cavity B30 to push the valve plug 14, the pressure of the slurry is increased until the pressure of the slurry is large enough to completely push the valve plug 14 open, the pressure of the slurry is decreased, and the phenomenon that the pressure of the slurry is increased firstly, then decreased and basically stable represents that the hydraulic fracturing mechanism reaches a preset position.
The valve water blocking port 13 is a unique three-dimensional annular slurry channel formed in a space above the valve block 14 after the device is fed in place under pressure, and slurry must flow through the water port B12 and then the valve water blocking port 13 is used for punching the valve block 14;
the spring pin 11 is a component matched with the valve plug 14, so that the valve plug 14 is pulled, the valve plug 14 is pushed by mud, the spring pin 11 is stretched, and the spring pin 11 is contracted in a natural state;
the sealing gasket 9 is in a ring shape, the outer side face of the sealing gasket 9 is tightly attached to the inner surface of the double-wall drill rod 6, the inner side face of the sealing gasket 9 is tightly attached to the outer surface of the central rod 3, the sealing gasket 9 plays a role in sealing the closed cavity B30 and limiting, and the sealing clamping plate 8 is located at the upper end of the sealing gasket 9 and used for preventing the sealing gasket 9 from being upwards displaced due to the fact that the sealing gasket 9 is pressed by pressure when the pressure of the closed cavity B30 is too large.
When a horizontal hole is inspected in a sealed mode, the push-pull valve 20 pushes the push-pull pipe 2 to the bottom, the water feeding port 17 of the push-pull pipe 2 is communicated with the cavity 18 of the packer pipeline 25, the water discharging port 21 of the push-pull pipe 2 is in a sealed state, the cavity 18 of the packer pipeline 25 is connected with the upper packer 22, the upper packer 22 is connected with the lower packer 26 through a pipeline, the push-pull pipe 2 pumps liquid to the cavity 18 of the packer pipeline 25, the upper packer 22, the pipeline and the lower packer 26 sequentially, and when the injected liquid expands the upper packer 22 and the lower packer 26 to the hole wall, the hole wall between the upper packer 22 and the lower packer 26 is sealed to form a sealed cavity C31.
When the hole wall is cracked, the push-pull valve 20 pushes the push-pull pipe 2 to the top, the lower water gap 21 of the push-pull pipe 2 flows through the cavity 19 of the fracturing pipe 23, the upper water gap 17 of the push-pull pipe 2 is in a blocking state, the cavity 19 of the fracturing pipe 23 is connected with the fracturing pipe 23, the push-pull pipe 2 pumps liquid into the cavity 19 of the fracturing pipe 23 and the fracturing pipe 23 in sequence, the liquid flows out from the water gap to a position between the upper packer 22 and the lower packer 26, when the input liquid is filled in the closed cavity C31, the hole wall is squeezed until the rock body is cracked, and the magnitude, the direction and the change rule of the ground stress along the depth are determined according to the pressure characteristic value and the fracturing direction.
High definition digtal camera 28 is used for the record video information, and laser emitter 28 provides light for high definition digtal camera 28, and comprehensive cable spool 1 is used for transmitting video information.
After the measurement is finished, the sealing pressure feeding mechanism, the in-place reporting mechanism, the hydraulic fracturing mechanism and the in-hole imaging mechanism are integrally lifted, so that the drill lifting is not needed during the measurement, the hydraulic fracturing and the acquisition of the crack propagation information of the drilled hole are integrated into a one-time drilling process, and the efficiency is improved; and during measurement, the image information of the surrounding rock mass around the drill hole can be acquired.
Claims (10)
1. The utility model provides a pressure-feed type level directional drilling engineering geological survey hydraulic fracturing test device, includes drilling tool assembly and hydraulic fracturing mechanism at least, its characterized in that: the inside of the drilling tool assembly is sequentially provided with a sealing pressure feeding mechanism, an in-place reporting mechanism and an in-hole imaging mechanism from top to bottom, wherein the hydraulic fracturing mechanism is positioned between the in-place reporting mechanism and the in-hole imaging mechanism;
the hydraulic fracturing mechanism comprises a push-pull pipe, a central rod, a push-pull valve, an upper packer, a fracturing pipe and a lower packer, wherein the push-pull pipe is arranged on the axis of the central rod, the lower part of the central rod is hollow, the push-pull valve is arranged at the hollow part of the central rod, the central rod and the push-pull valve are matched to form two closed cavities which are respectively a packer pipeline cavity close to the outer side and a fracturing pipe cavity close to the inner side, and the lower end of the push-pull valve is sequentially provided with the push-pull valve, the upper packer, the fracturing pipe and the;
the drilling assembly comprises a single-wall drill pipe, a double-wall drill pipe and a drill bit;
the in-place reporting mechanism comprises a suspension seat ring and a valve plug, the valve plug is arranged between the central rod and the double-wall drill rod, the outer surface of one side of the valve plug is completely attached to the central rod, the outer surface of the lower end of the other side of the valve plug is attached to the inner surface of the double-wall drill rod, and the suspension seat ring is arranged between the upper end of the valve plug and the double-wall drill rod;
the sealing pressure feeding mechanism comprises a sealing clamping plate and a sealing pad.
2. The pressure-feed type horizontal directional drilling engineering geological exploration hydraulic fracturing test device of claim 1, wherein: the lower end of the single-wall drill rod protrudes from the outer side part, the lower end of the double-wall drill rod is sunken from the outer side part, the protruding length is consistent with the sunken depth, the protruding part of the single-wall drill rod and the sunken side of the double-wall drill rod are mutually attached, the attached part is a joint, and a threaded hole is vertically formed in the middle of the joint.
3. The pressure-feed type horizontal directional drilling engineering geological exploration hydraulic fracturing test device of claim 1, wherein: two water gaps are arranged in the double-wall drill rod, one water gap is positioned above the sealing pressure feeding mechanism, and the other water gap is positioned below the sealing pressure feeding mechanism.
4. The pressure-feed type horizontal directional drilling engineering geological exploration hydraulic fracturing test device of claim 1, wherein: the number of the sealing clamping plates is two, and the two sealing clamping plates are respectively positioned at the left end and the right end of the central tube.
5. The pressure-feed type horizontal directional drilling engineering geological exploration hydraulic fracturing test device of claim 1, wherein: the sealing gasket is in a ring shape, the outer side face of the sealing gasket is tightly attached to the inner surface of the double-wall drill rod, and the inner side face of the sealing gasket is tightly attached to the outer surface of the central rod.
6. The pressure-feed type horizontal directional drilling engineering geological exploration hydraulic fracturing test device of claim 1, wherein: when the push-pull valve is pushed to the bottom by the push-pull pipe, the water inlet of the push-pull pipe corresponds to the cavity of the packer pipeline, and the water outlet of the push-pull pipe is in a blocking state; when the push-pull pipe is pulled to the top, the lower water opening of the push-pull pipe corresponds to the fracturing pipe cavity, and the upper water opening of the push-pull pipe is in a blocking state.
7. The pressure-feed type horizontal directional drilling engineering geological exploration hydraulic fracturing test device of claim 1, wherein: the upper packer is communicated with the lower packer through a pipeline.
8. The pressure-feed type horizontal directional drilling engineering geological exploration hydraulic fracturing test device of claim 1, wherein: and the outer wall of the fracturing pipe is provided with at least one water gap C.
9. The pressure-feed type horizontal directional drilling engineering geological exploration hydraulic fracturing test device of claim 1, wherein: the imaging mechanism in the hole comprises a comprehensive cable wire pipe, a laser transmitter and a high-definition camera.
10. The pressure-feed type horizontal directional drilling engineering geological exploration hydraulic fracturing test device of claim 1, wherein: and protective covers are arranged outside the laser emitter and the high-definition camera.
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| CN202011189431.9A CN112377103B (en) | 2020-10-30 | 2020-10-30 | Pressure feed type horizontal directional drilling engineering geological exploration hydraulic fracturing test device |
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| CN202011189431.9A CN112377103B (en) | 2020-10-30 | 2020-10-30 | Pressure feed type horizontal directional drilling engineering geological exploration hydraulic fracturing test device |
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| CN112377103B CN112377103B (en) | 2021-12-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113431560A (en) * | 2021-07-09 | 2021-09-24 | 中国地质科学院地质力学研究所 | Equal-path double-channel fracturing device suitable for hydrofracturing ground stress measurement |
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