CN107290194B - Drilling and manufacturing device for oil shale true triaxial hydraulic fracturing simulation experiment test block - Google Patents
Drilling and manufacturing device for oil shale true triaxial hydraulic fracturing simulation experiment test block Download PDFInfo
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- CN107290194B CN107290194B CN201710663712.5A CN201710663712A CN107290194B CN 107290194 B CN107290194 B CN 107290194B CN 201710663712 A CN201710663712 A CN 201710663712A CN 107290194 B CN107290194 B CN 107290194B
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- oil shale
- grouting pipe
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
Abstract
The invention discloses a drilling manufacturing device for an oil shale true triaxial hydraulic fracturing simulation experiment test block, which comprises a grouting pipe, a left clamp holder, a right clamp holder, an oil shale drill rod, an internal thread pressure-giving sleeve, a pressure-giving screw rod and a pipe twisting turntable, wherein the left clamp holder and the right clamp holder are arranged on the left clamp holder; when the cement consolidation test block reaches higher strength, the internal thread formed by sweeping in cement is matched with the grouting pipe thread, so that the force generated by high-pressure liquid in hydraulic fracturing experiments can be resisted, the bonding strength of the grouting pipe built in cement mortar in the traditional experiments can be achieved, and the requirements of the experiments are ensured. The grouting pipe is left in the test block, and the oil shale drill rod is used for drilling an open hole with a certain depth in the oil shale to form a stepped hole, so that auxiliary casing and open hole fracturing in production operation are simulated more truly. The whole drilling process adopts manual screwing in, and the cost and the accuracy are all superior to those of the original electric drill.
Description
Technical Field
The invention relates to the field of oil shale hydraulic fracturing research, in particular to an oil shale true triaxial hydraulic fracturing simulation experiment device and an experiment method
Background
The demand for petroleum resources has increased dramatically in the 21 st century, however, as fields age and years of exploitation, conventional oil and gas resources have become difficult to meet the demand for economic development, and oil shale is an emerging successor resource, whose exploitation and utilization has become a hotspot of research and attention nowadays.
The existing oil shale exploitation technology is roughly divided into a ground carbonization technology and an in-situ exploitation technology, wherein the in-situ exploitation technology has little pollution to the environment, but has the defects of high exploitation cost, long exploitation period and the like, the current in-situ exploitation technology can be effectively improved by improving the permeability of the oil shale through the artificial joint formation of a hydraulic fracturing technology, and the hydraulic fracturing technology is taken as one of core technologies of shale gas exploitation and is widely applied to the production increase operation of shale gas wells.
In the prior patent documents CN104330310A and CN204128905U, an oil shale hydraulic fracturing simulation experiment system and a manufacturing method of an experiment sample are disclosed, wherein the hydraulic fracturing experiment simulation system consists of a hydraulic fracturing pressurizing and data collecting part and an experiment sample triaxial pressurizing part; the actual oil shale test block can be utilized to test the crack initiation pressure and crack expansion conditions of the oil shale under different ground stress conditions and different perforation conditions; the experiment can be carried out by utilizing the real oil shale test block, and the stress in three directions can be fully transferred to the oil shale test block by utilizing the true triaxial pressure experiment table, so that the real stress condition of the oil shale in the underground buried region is simulated, and the stress of the oil shale test block is more realistic. The sample test block used in the test is wrapped oil shale, drill holes are drilled through drill rods with different diameters, grouting pipes are poured into cement to manufacture the oil shale, the solidified cement is used for simulating the upper and lower strata of the oil shale, and the real burying condition of the oil shale is simulated.
The electric drill hole forming mechanism can complete the grouting experiment according to the experiment requirement, but has the advantages that the drilling process is complex, the drilling is stopped when drilling to a certain depth in the drilling process, the blowing machine is used for discharging powder, and the hole forming process is complex. And after the experiment is finished, a large amount of cement blocks are solidified around the grouting pipe poured in the test block, so that the cement blocks are difficult to recycle. In addition, the electric drill hole forming is difficult to ensure the accuracy of drilling depth and drilling direction, and the original structure of the test block can be damaged in the drilling process, so that a certain experimental error is generated. Therefore, the design of the drilling device which can drill the accurate deep drilling and can be recycled is of great significance to the hydraulic fracturing experiment of the oil shale.
Disclosure of Invention
The invention aims to provide a set of drilling device which can reduce the drilling cost and improve the accuracy and quality of drilling.
The invention comprises a grouting pipe, a left clamp holder, a right clamp holder, an oil shale drill rod, an internal thread pressure-giving sleeve, a pressure-giving screw rod and a pipe twisting turntable;
the grouting pipe is characterized in that a drill bit structure is arranged below the grouting pipe, a first external thread is arranged above the drill bit body structure, a positioning baffle with a diameter larger than the outer diameter of the first external thread is arranged above the first external thread, a first hexagonal joint is arranged on the upper portion of the grouting pipe, a first internal thread is arranged in the first hexagonal joint and used for being connected with a grouting pump to carry out hydraulic fracturing experiments, and a grouting channel is arranged in the grouting pipe.
The upper parts of the left clamp holder and the right clamp holder are provided with protruding external threads which can be screwed with the second internal threads of the internal thread pressure-supply sleeve, clamp the test block mould and bear the counterforce during drilling. The protruding external thread is provided with a threaded hole and a grouting pipe through hole, the left clamp holder and the right clamp holder are provided with clamp holder frames, and the left clamp holder and the right clamp holder are fixedly matched into a whole through bolts and threaded holes.
The oil shale drill rod is of a solid structure, a cutting edge is arranged below the oil shale drill rod and used for drilling oil shale samples, and the oil shale drill rod is provided with a second external thread which is matched with a third internal thread in a second hexagonal joint of the pressure-giving screw. The outer diameter of the oil shale drill rod is the same as the inner diameter of the grouting pipe, the grouting pipe is plugged in the drilling process to prevent cement from entering the grouting pipe, and a third hexagonal joint is arranged at the upper part of the oil shale drill rod.
The internal thread is given and is pressed the sleeve pipe cavity, and the internal thread is given and is pressed the inside protrusion external screw thread cooperation that is furnished with second internal thread and control the holder of sleeve pipe, is given the screw rod through the internal thread and is screwed into in the sleeve pipe and realize the feeding of drilling. In addition, the device ensures the precision of vertical hole forming. The internally threaded pressure feed sleeve has a projecting structure for threading the tube.
The screw rod is hollow, the lower part of the screw rod is provided with an inner hexagonal groove matched with the first hexagonal joint of the grouting pipe, the upper part of the screw rod is provided with a third hexagonal joint, and the third hexagonal joint is matched with the second hexagonal groove of the pipe screwing chuck. And the third hexagonal joint is internally provided with an internal thread matched with the second external thread of the oil shale drill rod, so that the position of the oil shale drill rod can be fixed. The pressure-feeding screw is provided with a third external thread which is matched with the internal thread pressure-feeding sleeve, and the pressure-feeding screw drives the grouting pipe to feed and drill cement when screwed in.
The screwing clamp disc is provided with an annular reinforcing structure, a screwing clamp hand, a first hexagonal groove and a second hexagonal groove.
The test block drilling method of the invention comprises the following steps:
step one, clamping a test block die by using a left clamp holder and a right clamp holder, screwing a bolt into a threaded hole for fixation, and screwing an external thread protruding from the upper part into an internal thread pressure-giving sleeve;
and step two, screwing and assembling the pressure-feeding screw, the grouting pipe and the oil shale drill pipe into a whole, wherein a first hexagonal joint of the grouting pipe is matched with an inner hexagonal groove of the pressure-feeding screw, and the cutting edge surface of the oil shale drill pipe is ensured to be flush with the lower cutting edge surface of the grouting pipe by utilizing an inner thread in the pressure-feeding screw.
Step two, screwing the whole into an internal thread to press the sleeve, screwing the experiment personnel downwards by using a third hexagonal joint of a pressing screw rod matched with a second hexagonal groove of a pipe screwing rotary table, drilling the drill bit structure below the grouting pipe into cement, forming a hole by extruding the cement, tapping the first external thread above in the cement in the drilling process to form a thread matched with the cement until a positioning baffle of the grouting pipe contacts the surface of the cement, and stopping screwing.
And thirdly, screwing the shale drill rod into the first hexagonal groove, and stopping drilling after drilling to a certain depth.
And step four, after the cement blocks are completely solidified after 7-12 days, sequentially disassembling the device according to the sequence of the oil shale drill rod, the internal thread pressure-feeding sleeve, the pressure-feeding screw rod and the left and right clamps, and completing stepped drilling.
And fifthly, connecting the internal first internal thread of the first hexagonal joint on the grouting pipe with a pump line, and performing a hydraulic fracturing experiment. After the experiment is completed, the device is reassembled to screw out the grouting pipe and clean a small amount of cement solidified on the surface for the next experiment.
The invention has the beneficial effects that:
when the cement consolidation test block reaches higher strength, the internal thread formed by sweeping in cement is matched with the grouting pipe thread, so that the force generated by high-pressure liquid in hydraulic fracturing experiments can be resisted, the bonding strength of the grouting pipe built in cement mortar in the traditional experiments can be achieved, and the requirements of the experiments are ensured. The grouting pipe is left in the test block, and the small-size drill pipe is used for drilling an open hole with a certain depth in the oil shale to form a stepped hole, so that auxiliary casing and open hole fracturing in production operation are simulated more truly. The whole drilling process adopts manual screwing in, and the cost and the accuracy are all superior to those of the original electric drill. And because the surface of the grouting pipe is sprayed with the insulating material, the grouting pipe can be unscrewed for recycling after experiments, and the experiment cost is greatly reduced.
Drawings
FIG. 1 is a schematic view of the structure of the left and right holders with which the present invention has been assembled.
Fig. 2 is a cross-sectional view of the construction of the grouting pipe of the present invention.
Fig. 3 is a structural cross-sectional view of the pressure screw of the present invention.
Fig. 4 is a schematic diagram of the structure of the oil shale drill pipe of the invention.
Fig. 5 is a cross-sectional view of the internal thread pressure-applying sleeve structure of the present invention.
Fig. 6 is a top view of the pipe twisting turntable structure of the present invention.
Fig. 7 is a schematic structural view of the present invention.
In the figure: 1-left and right grippers; 2-grouting pipe; 3-a pressure-feed screw; 4-an oil shale drill pipe; 5-internal thread pressure-applying sleeve; 6-a pipe twisting turntable; 7-a hydraulic valve assembly; 8-a pump device; 101-a gripper frame; 102-male external threads; 103-a threaded hole; 104, grouting pipe through holes; 201—bit structure; 202-grouting channel; 203-positioning a baffle; 204—a first hexagonal joint; 205—a first internal thread; 206—a first external thread; 301-a second hexagonal joint; 302—internal threads; 303—a third external thread; 304-an inner hexagonal groove; 401-third hexagonal joint; 402-a second external thread; 403-cutting edge; 501-a second internal thread; 502-protruding structure for twisting tube; 601-an annular reinforcing structure; 602, screwing in a clamping hand; 603-a first hexagonal recess; 604-a second hexagonal recess.
Detailed Description
As shown in fig. 1 to 7, the invention comprises a grouting pipe 2, a left clamp holder 1, a right clamp holder 1, an oil shale drill rod 4, an internal thread pressure-giving sleeve 5, a pressure-giving screw 3 and a pipe-twisting rotary table 6;
the lower part of the grouting pipe 2 is provided with a drill bit structure 201, a first external thread 206 is arranged above the drill bit body structure 201, a positioning baffle 203 with a diameter larger than the outer diameter of the first external thread 206 is arranged above the first external thread 206, the upper part of the grouting pipe 2 is provided with a first hexagonal joint 204, a first internal thread 205 is arranged in the first hexagonal joint 204 and is used for being connected with a grouting pump to carry out hydraulic fracturing experiments, and a grouting channel 202 is arranged in the grouting pipe 2.
The upper parts of the left holder 1 and the right holder 1 are provided with protruding external threads 102, the protruding external threads 102 can be screwed with second internal threads 501 of the internal thread pressure-supplying sleeve 5, the test block mould is clamped, and counter force is born during drilling and feeding. The male screw 102 has a screw hole 103 and a grouting pipe through hole 104, the left and right clamps 1 have a clamp frame 101, and the left and right clamps 1 are fixedly fitted into one body by bolts and screw holes 103.
The oil shale drill rod 4 is of a solid structure, a cutting edge 403 is arranged below the oil shale drill rod 4 and used for drilling oil shale samples, and the oil shale drill rod 4 is provided with a second external thread 402 which is matched with the third internal thread 302 in the second hexagonal joint 301 of the pressure-giving screw 3. The outer diameter of the oil shale drill rod 4 is the same as the inner diameter of the grouting pipe 2, the grouting pipe 2 is plugged in the drilling process, cement is prevented from entering the grouting pipe 2, and a third hexagonal joint 401 is arranged at the upper part of the oil shale drill rod 4.
The internal thread pressure-feeding sleeve 5 is hollow, the second internal thread 501 is arranged in the internal thread pressure-feeding sleeve 5 and can be matched with the convex external threads 102 of the left holder 1 and the right holder 1, and the feeding of drilling holes is realized by screwing the pressure-feeding screw 3 into the internal thread pressure-feeding sleeve 5. In addition, the device ensures the precision of vertical hole forming. The internally threaded pressure-feed sleeve 5 has a projecting formation 502, which projecting formation 502 serves to screw the pipe.
The pressure-feeding screw 3 is hollow, an inner hexagonal groove 304 matched with the first hexagonal joint 204 of the grouting pipe 2 is formed in the lower portion of the pressure-feeding screw 3, a third hexagonal joint 301 is arranged in the upper portion of the pressure-feeding screw 3, and the third hexagonal joint 301 is matched with a second hexagonal groove 604 of the pipe screwing clamping disc 6. The third hexagonal joint 301 is internally provided with an internal thread 302 matched with a second external thread 402 of the oil shale drill rod 4, so that the position of the oil shale drill rod 4 can be fixed. The pressure-feeding screw 3 is provided with a third external thread 303, and the third external thread 303 is matched with the internal thread pressure-feeding sleeve 5 to drive the grouting pipe 2 to feed and drill cement when being screwed in.
The screw chuck 6 has an annular reinforcing structure 601, screw-in fingers 602, a first hexagonal recess 603 and a second hexagonal recess 604.
The test block drilling method of the invention comprises the following steps:
step one, clamping a test block die by using a left clamp holder 1 and a right clamp holder 1, screwing a bolt into a threaded hole 103 for fixing, and screwing an internal thread pressure-giving sleeve 5 into an external thread 102 protruding above;
step two, the pressure-feed screw 3, the grouting pipe 2 and the oil shale drill pipe 4 are screwed and assembled into a whole, the first hexagonal joint 204 of the grouting pipe 2 is matched with the inner hexagonal groove 304 of the pressure-feed screw 3, and the inner threads 302 in the pressure-feed screw 3 are utilized to ensure that the surface of the cutting edge 403 of the oil shale drill pipe 4 is flush with the surface of the lower cutting edge of the grouting pipe 2.
Step two, screwing the whole into the internal thread to press the sleeve 5, screwing the experimenter downwards by using the second hexagonal groove 604 of the pipe screwing rotary table 6 to match with the third hexagonal joint 301 of the pressure feeding screw 3, drilling the drill bit structure 201 below the grouting pipe 2 into cement, forming a hole by extruding the cement, tapping the first external thread 206 above in the cement to form a matched thread in the cement in the drilling process until the positioning baffle 203 of the grouting pipe 2 contacts the surface of the cement, and stopping screwing.
And thirdly, screwing the first hexagonal groove 603 into the oil shale drill rod 4, and stopping drilling after drilling to a certain depth.
Step four, after the cement blocks are completely solidified after 7-12 days, the device is disassembled sequentially according to the sequence of the oil shale drill rod 4, the internal thread pressure-feeding sleeve 5, the pressure-feeding screw 3 and the left and right clamps 1, so that stepped drilling is completed.
And fifthly, connecting the internal first internal threads 205 of the first hexagonal joint 204 on the grouting pipe 2 with a pump line, and performing a hydraulic fracturing experiment. After the experiment is completed, the device is reassembled to unscrew the grouting pipe 2 and clean a small amount of cement solidified on the surface for the next experiment.
Claims (1)
1. A drilling making devices that is used for true triaxial hydraulic fracturing simulation experiment test block of oil shale, its characterized in that: the device comprises a grouting pipe (2), left and right clamps (1), an oil shale drill rod (4), an internal thread pressure-feeding sleeve (5), a pressure-feeding screw (3) and a pipe twisting rotary table (6);
a drill bit structure (201) is arranged below the grouting pipe (2), a first external thread (206) is arranged above the drill bit body structure (201), a positioning baffle plate (203) with a diameter larger than the outer diameter of the first external thread (206) is arranged above the first external thread (206), a first hexagonal joint (204) is arranged at the upper part of the grouting pipe (2), a first internal thread (205) is arranged in the first hexagonal joint (204) and used for being connected with a grouting pump to carry out hydraulic fracturing experiments, and a grouting channel (202) is arranged in the grouting pipe (2);
the upper parts of the left clamp holder (1) and the right clamp holder (1) are provided with protruding external threads (102), the protruding external threads (102) can be screwed with second internal threads (501) of the internal thread pressure-supply sleeve (5), the test block mould is clamped, and counter force during drilling feeding is born; the convex external thread (102) is provided with a threaded hole (103) and a grouting pipe through hole (104), the left clamp holder (1) and the right clamp holder (1) are provided with clamp holder frames (101), and the left clamp holder and the right clamp holder (1) are fixedly matched into a whole through bolts and the threaded hole (103);
the oil shale drill rod (4) is of a solid structure, a cutting edge (403) is arranged below the oil shale drill rod (4) and used for drilling an oil shale sample, and the oil shale drill rod (4) is provided with a second external thread (402) which is matched with a third internal thread (302) in a second hexagonal joint (301) of the pressure-giving screw rod (3); the outer diameter of the oil shale drill rod (4) is the same as the inner diameter of the grouting pipe (2), and a third hexagonal joint (401) is arranged at the upper part of the oil shale drill rod (4);
the internal thread pressure-feeding sleeve (5) is hollow, a second internal thread (501) is arranged in the internal thread pressure-feeding sleeve (5) and can be matched with the convex external threads (102) of the left clamp holder (1) and the right clamp holder (1), and the pressure-feeding screw (3) is screwed into the internal thread pressure-feeding sleeve (5) to realize the feeding of drilling holes; the internal thread pressure-giving sleeve (5) is provided with a convex structure (502);
the pressure-feeding screw (3) is hollow, an inner hexagonal groove (304) matched with the first hexagonal joint (204) of the grouting pipe (2) is formed in the lower portion of the pressure-feeding screw (3), a third hexagonal joint (301) is formed in the upper portion of the pressure-feeding screw (3), and the third hexagonal joint (301) is matched with the second hexagonal groove (604) of the pipe-screwing clamping disc (6); the third hexagonal joint (301) is internally provided with an internal thread (302) matched with a second external thread (402) of the oil shale drill rod (4), so that the position of the oil shale drill rod (4) can be fixed; the pressure-feeding screw (3) is provided with a third external thread (303), the third external thread (303) is matched with the internal thread pressure-feeding sleeve (5), and the grouting pipe (2) is driven to feed and drill cement when the pressure-feeding screw is screwed in;
the screwing clamp disc (6) is provided with an annular reinforcing structure (601), a screwing clamp hand (602), a first hexagonal groove (603) and a second hexagonal groove (604).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710663712.5A CN107290194B (en) | 2017-08-06 | 2017-08-06 | Drilling and manufacturing device for oil shale true triaxial hydraulic fracturing simulation experiment test block |
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| CN201710663712.5A CN107290194B (en) | 2017-08-06 | 2017-08-06 | Drilling and manufacturing device for oil shale true triaxial hydraulic fracturing simulation experiment test block |
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| CN107290194B true CN107290194B (en) | 2023-04-28 |
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| CN109752249B (en) * | 2019-01-22 | 2024-02-27 | 北京交通大学 | Sealing device and sealing method for sample and grouting base in triaxial mud water splitting test |
| CN110374585A (en) * | 2019-08-08 | 2019-10-25 | 吉林大学 | It is a kind of to simulate the experimental provision and method that mud is spread in oil shale fracturing stratum |
| CN111398040B (en) * | 2020-03-20 | 2021-03-23 | 上海交通大学 | Oblique reverse thrust cascade static test device for aircraft engine |
| CN112461668B (en) * | 2020-11-06 | 2022-04-29 | 武汉大学 | Test method for researching hydraulic fracturing induced fault activation |
| CN113100607A (en) * | 2021-04-22 | 2021-07-13 | 西南石油大学 | Display device for hydraulic fracturing experiment simulation |
| CN114166649B (en) * | 2021-12-08 | 2024-03-12 | 中南大学 | Experimental device and experimental method for simulating in-situ deep shale drilling and hydraulic fracturing |
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| CN104141470A (en) * | 2014-07-01 | 2014-11-12 | 中煤科工集团西安研究院有限公司 | Pore-forming and sealing method for hydraulic fracturing borehole casing section in underground coal mine |
| CN104330310A (en) * | 2014-10-29 | 2015-02-04 | 吉林大学 | Hydraulic fracturing simulation experiment system for oil shale and manufacturing method of experiment sample |
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