CN113628525A - Device and method for simulating rock carrying of reverse circulation eccentric flow field of gas drilling - Google Patents
Device and method for simulating rock carrying of reverse circulation eccentric flow field of gas drilling Download PDFInfo
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- G09B25/00—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes
Abstract
The invention relates to a device and a method for simulating reverse circulation eccentric flow field rock carrying of gas drilling. The device consists of an air supply unit, a shaft simulation unit, an exhaust and rock debris processing unit, a data and video acquisition unit and a computer processing unit, wherein the air supply unit comprises an air compressor, a pressure stabilizing tank, a gas flowmeter and a dehydrator; the shaft simulation unit comprises an outer pipe, an inner pipe, an eccentric drill bit, a sand filling opening, a sand discharging opening, a rotating shaft and a support; the exhaust and rock debris processing unit comprises an exhaust pipe, a chip removal pipe and a rock debris pool; the data and video acquisition unit comprises a pressure sensor, a gas flowmeter and a camera; the computer processing unit comprises a data acquisition box and a computer. The method can realize visualization of underground gas injection amount and carrying migration in the reverse circulation process of gas drilling according to the actual condition of the eccentric flow field at the bottom of the well. According to the invention, effective measures for improving the gas drilling well hole purification effect are found by developing researches on gas injection amount, rock debris migration rule and debris removal rate.
Description
Technical Field
The invention relates to the technical field of petroleum and natural gas drilling, in particular to a device and a method for simulating rock carrying of a reverse circulation eccentric flow field of gas drilling.
Background
Gas drilling is a special underbalanced drilling technology taking gas phase fluid as a circulating medium, and compared with the conventional liquid phase drilling technology, gas has higher upward return speed and stronger rock debris carrying capacity, can accurately react on the characteristics of stratum rocks, and can effectively protect a low-permeability reservoir stratum from being damaged by drilling fluid; reverse circulation will flow in the annulus from top to bottom with lower circulation pressure losses downhole than in the forward circulation. Meanwhile, after calculation, the gas injection quantity can be properly reduced when the reverse circulation technology is applied to drilling, namely the gas drilling cost is reduced, and the reverse circulation gas drilling has advantages which cannot be compared with other technologies. The rock debris returning to the earth surface from the central channel of the inner pipe in the drilling process is collected to replace the rock core in the conventional coring drilling for geological record, rock and ore analysis and the like, so that the method is a brand new drilling method and has the remarkable characteristics of high quality, high efficiency and low consumption.
In the process of the upward return of the rock debris circulation, if the rock carrying capacity of the equipment is poor, the rock debris can be accumulated at the bottom of the well to form a rock debris bed, so that the abrasion or the drill sticking of a drill bit can be caused, and the drilling process can be influenced. Therefore, the method has important significance for carrying out experiment and determination on the rock carrying capacity in the drilling process, quantitative evaluation on the adaptability of the gas reverse circulation drilling technology and optimization of the overall process scheme. The calculation of air drilling annular space and pressure consumption in the pipe belongs to the hydrodynamics of the annular space in the pipe, and particularly the calculation of the pressure of the eccentric annular space in the air drilling is particularly worth researching. In the case of eccentric boreholes, the assumption of concentric annuli, which is customary in drilling hydraulics, does not hold. Therefore, the research on the fluid flow rule under the eccentric working condition of the air drilling has obvious theoretical significance and practical value. However, at present, related researches at home and abroad are few, and a special testing device and a special testing method are not formed. Therefore, in order to further research the rock carrying capacity of the gas drilling reverse circulation eccentric flow field, the invention of a visualization device and a method for simulating the rock debris carrying migration of the eccentric flow field in the gas drilling reverse circulation process is urgently needed.
Disclosure of Invention
The invention aims to provide a device for simulating rock carrying of a reverse circulation eccentric flow field of gas drilling, which has reliable principle and whole-course visualization and can truly reflect underground gas injection amount and rock carrying rule in the reverse circulation process of gas drilling, thereby guiding engineering practice according to basic data and analysis results.
The invention also aims to provide a method for simulating the rock carrying of the reverse circulation eccentric flow field of the gas drilling by using the device, and by developing the related researches on gas injection quantity, rock debris migration rule and chip removal rate through the method, the fluid flow rule under the eccentric working condition of the air drilling is found, and effective measures for improving the purification effect of the gas drilling well are found.
In order to achieve the technical purpose, the invention adopts the following technical scheme.
A device for simulating the rock carrying of a reverse circulation eccentric flow field of gas drilling comprises a gas supply unit, a shaft simulation unit, an exhaust and rock debris processing unit, a data and video acquisition unit and a computer processing unit.
The air supply unit consists of an air compressor, a gate valve, a surge tank, a high-pressure hose, a three-way valve and a dehydrator and is used for providing stable air flows with different flows for experiments; the shaft simulation unit is a main body of the experimental device, wherein the outer pipe is used for simulating a well wall, the inner pipe is used for simulating a drill column, the eccentric drill bit is arranged at the bottom of the inner pipe, only one water hole is formed in the eccentric drill bit, fluid and rock debris return through the water hole to form an eccentric flow field different from a concentric flow field, and a space is reserved at the bottom of the organic glass pipe and used for filling sand to simulate the bottom hole condition; the exhaust and rock debris processing unit consists of an exhaust pipe, a chip removal pipe and a rock debris pool and is used for exhausting, removing chips and processing rock debris in a centralized manner; the data and video acquisition unit consists of a pressure detector, a gas flowmeter and a camera and is used for recording flow change, pressure change of an outlet, an inlet and a well bottom of the shaft simulation unit and experimental phenomena; the computer processing unit consists of a data acquisition box and a computer and is used for processing experimental data.
An air compressor of the air supply unit is connected with the pressure stabilizing tank through a gate valve; the pressure stabilizing tank is connected with a three-way valve through a gate valve and a high-pressure hose, and the three-way valve is used for changing the flow direction of gas in a pipeline so as to provide stable gas flow for a shaft simulation unit; the three-way valve is connected with a water removing machine through a high-pressure hose, and the water removing machine is used for completely removing water pumped into air by an air compressor, so that the interference of accumulated water in a pressure stabilizing tank on an experiment is avoided; the water removing machine is connected with the air inlet of the high-pressure hose shaft simulation unit.
An eccentric drill bit of the shaft simulation unit is fixed at the bottom of the inner pipe through a screw, a motor and a bevel gear are connected with the inner pipe to drive the inner pipe and the drill bit at the bottom to rotate, and a support and a shaft are fixed through a rotating shaft to rotatably adjust the direction of the shaft; the sand filling port is positioned at the bottom of the outer shaft and used for filling sand grains into the bottom of the pipeline; the sand discharge port is positioned at the bottom of the shaft simulation unit and used for discharging residual sand after the experiment is finished, and the Y-shaped sealing rubber ring, the O-shaped sealing rubber ring and the flange are arranged at the joint of the inner pipe and the outer pipe and the joint of the inner pipe and the exhaust pipe and used for ensuring the sealing property of the shaft simulation unit.
Exhaust and detritus processing unit's blast pipe links to each other with the export of pit shaft analog unit, and the blast pipe links to each other with the chip removal pipe, and the chip removal pipe export is located detritus pond top, and the detritus pond is arranged in collecting the drilling cuttings of exhaust in the experiment.
The pressure sensors of the data and video acquisition unit are arranged at the inlet, the outlet and the bottom of the shaft simulation unit and are used for monitoring the pressure at the inlet, the outlet and the bottom; the gas flowmeter is arranged between the three-way valve and the pressure stabilizing tank valve and used for measuring the flow of gas, the pressure detector is connected with the data acquisition box and the computer through a data line, and the camera of the data and video acquisition unit is used for recording the sand grain migration condition in the pipe.
The computer processing unit consists of a computer and a collecting box and is used for processing the collected pressure data.
Furthermore, the working range of the pressure detector is-0.1 MPa-1 MPa.
Furthermore, the air inlet rubber tube adopted by the air supply unit is a high-pressure hose, and has strong pressure-bearing capacity.
Furthermore, the inner pipe and the outer pipe of the shaft simulation unit are made of organic glass materials, so that the shaft simulation unit has certain pressure bearing capacity, the highest pressure bearing capacity is 6Mpa, and the migration condition of rock debris in the pipes can be clearly observed.
Furthermore, the drill bit is provided with an eccentric water hole which is used as a channel for gas to carry rock debris at the bottom of the well to return to the annular space and is a main factor for forming an eccentric flow field.
Further, the eccentric drill bit and the inner pipe of the shaft simulation unit are fixed at the bottom of the inner pipe through screws and sealed through an O-shaped ring and glue.
Furthermore, the joints of the sensors and the pipelines are provided with packing seals, so that the air tightness of the whole device is ensured.
Furthermore, in order to simulate the real state during drilling, the motor and the bevel gear drive the inner cylinder and the drill bit to rotate.
Further, under the drill bit, the bottom of the outer tube has enough space to fill the rock debris.
Furthermore, a sand filling opening and a sand discharging opening of the shaft simulation unit are connected in a threaded mode, so that the shaft simulation unit is convenient to assemble and disassemble for many times.
Furthermore, the rotating shaft is fixed on the outer pipe and connected with an external bracket, and pipelines connected with the inlet and the outlet of the shaft simulation unit are hoses, so that the direction of the pipelines can be adjusted.
The method for simulating the rock-carrying of the reverse circulation eccentric flow field of the gas drilling by using the device sequentially comprises the following steps of:
(1) sand grains with certain grain sizes are filled into the space between the bottom of the inner pipe and the bottom of the outer pipe through the sand filling port;
(2) adjusting the angle of a shaft through a rotating shaft, starting an air compressor and a dewatering machine, and injecting air into a pressure stabilizing tank to reach a preset pressure;
(3) starting a motor and a bevel gear to drive the inner pipe and the eccentric drill bit to rotate;
(4) adjusting a pressure stabilizing tank gate valve to obtain airflow with stable flow, and supplying air to an air inlet of the shaft simulation unit through a three-way valve;
(5) a camera observes the rock debris migration condition in the pipe and acquires image information, and a data acquisition box acquires pressure flow data;
(6) gradually regulating the flow rate, repeating the steps, and determining the starting flow rate of the sand grains when all the sand grains are carried out of the shaft under the flow rate;
(7) after the starting flow is determined, carrying out experiments of different flows above the starting flow, starting timing when stable airflow is introduced into the air inlet, stopping when all sand grains are carried out, and calculating the chip removal rate at the flow;
(8) and drawing a relation curve of the flow rate, the chip removal rate and the pressure with time.
By changing the angle of a shaft or filling sand grains with different grain sizes, a parallel experiment is carried out, and the starting flow rate at different angles and the sand discharge rate at the flow rate or the starting flow rate of the sand grains with different grain sizes and the sand discharge rate at the flow rate are determined.
Compared with the prior art, the invention has the following advantages:
the method has strong pertinence in design, can reflect the actual condition of the eccentric flow field at the bottom of the well, realizes the visualization of the rock debris starting and migration rule, has reliable test result, feasible test method and simple operation, and can provide significant basic data for the research of the eccentric flow field.
Drawings
Fig. 1 is a schematic structural diagram of a device for simulating reverse circulation eccentric flow field rock carrying of gas drilling.
Fig. 2 is a cross-sectional view of the drill (a-top view of the drill; b-side view of the drill).
In the figure: 1-air compressor, 2-gate valve, 3-surge tank, 4-gate valve, 5-gas flowmeter, 6-three-way valve, 7-dehydrator, 8-high pressure hose, 9-air inlet, 10-pressure sensor A, 11-rotating shaft, 12-inner pipe, 13-outer pipe, 14-eccentric drill bit, 15-sand filling port, 16-pressure sensor B, 17-sand discharge port, 18-O type sealing rubber ring, 19-Y type sealing rubber ring, 20-flange, 21-motor and bevel gear, 22-O type sealing rubber ring, 23-flange, 24-pressure sensor C, 25-air outlet, 26-exhaust pipe, 27-chip discharge pipe, 28-chip pool, 29-camera, 30-support, 31-computer, 32-data acquisition box, 33-eccentric water hole.
FIG. 3 is a pressure change diagram in a gas drilling reverse circulation eccentric flow field rock-carrying experiment.
Fig. 4 is a graph of gas flow rate versus chip evacuation rate.
Detailed Description
The invention is further illustrated below with reference to figures and examples in order to facilitate the understanding of the invention by a person skilled in the art. It is to be understood that the invention is not limited in scope to the specific embodiments, but is intended to cover various modifications within the spirit and scope of the invention as defined and defined by the appended claims, as would be apparent to one of ordinary skill in the art.
See fig. 1, 2.
A device for simulating the rock carrying of an anti-circulation eccentric flow field of gas drilling comprises a gas supply unit, a shaft simulation unit, an exhaust and rock debris processing unit, a data and video acquisition unit and a computer processing unit.
The gas supply unit comprises an air compressor 1, a surge tank 3, a gas flowmeter 5, a three-way valve 6 and a dehydrator 7, wherein the air compressor 1 is sequentially connected with the surge tank 3, the three-way valve 6 and the dehydrator 7 through a high-pressure hose 8, the dehydrator is connected with a gas inlet of the shaft simulation unit, and the gas flowmeter 5 is arranged on a connecting pipeline of the surge tank and the three-way valve.
The shaft simulation unit comprises an outer pipe 13, an inner pipe 12, an eccentric drill bit 14, a motor, a bevel gear 21, an air inlet 9, an air outlet 25, a sand filling opening 15, a sand discharging opening 17, a rotating shaft 11 and a support 30, wherein the outer pipe 13 simulates a shaft, the inner pipe 12 simulates a drill string, the outer pipe is fixed on the support 30 through the rotating shaft 11 and can rotate to adjust the direction of the shaft, the outer pipe is provided with the air inlet 9, and the air inlet is connected with a water removal machine 7; the inner pipe is connected with a motor and a bevel gear 21, an eccentric drill bit 14 is fixed at the bottom of the inner pipe through a screw, the motor drives the inner pipe and the eccentric drill bit to rotate, and enough reserved space is reserved below the eccentric drill bit for filling sand to simulate the shaft bottom condition; the bottom of the outer pipe is provided with a sand filling port 15 and a sand discharging port 17; the top of the inner pipe is provided with an air outlet 25, and the inner pipe is connected with an exhaust pipe of the exhaust and rock debris processing unit through the air outlet; the air inlet, the bottom of the outer tube and the air outlet are respectively provided with a pressure sensor 10, a pressure sensor 16 and a pressure sensor 24.
Exhaust and detritus processing unit include blast pipe 26, chip removal pipe 27 and detritus pond 28, and blast pipe 26 links to each other with pit shaft analog unit's gas outlet 25, and chip removal pipe 27 is connected to the blast pipe, and the chip removal pipe export is located detritus pond 28 top.
The data and video acquisition unit comprises pressure sensors (10, 16 and 24), a gas flowmeter (5) and a camera (29), wherein the pressure sensors are used for monitoring pressure changes of an inlet, an outlet and the bottom of a well bore simulation unit, the gas flowmeter is used for measuring the flow of gas, the camera records the sand grain migration condition in the pipe, and the pressure sensors are connected with a computer processing unit.
The computer processing unit comprises a data acquisition box 32 and a computer 31 for acquiring and processing data.
The eccentric bit 14 is provided with an eccentric port 33 for the passage of gas carrying downhole debris up the annulus.
And the joint of the inner pipe and the outer pipe is provided with an O-shaped sealing rubber ring 18, a Y-shaped sealing rubber ring 19 and a flange 20, and the joint of the inner pipe and the exhaust pipe is provided with an O-shaped sealing rubber ring 22 and a flange 23 for ensuring the sealing property of the shaft simulation unit.
The inner tube and the outer tube of the shaft simulation unit are made of organic glass materials, and the situation of rock debris migration in the tubes can be observed through a camera.
The joint of the pressure sensor and the pipeline is provided with a packing seal, so that the air tightness of the whole device is ensured.
The method for simulating the rock-carrying of the reverse circulation eccentric flow field of the gas drilling by using the device sequentially comprises the following steps of:
1) the valves, pipelines and the like of the experimental device are checked and adjusted, so that smooth gas transmission and gas outlet pipelines are ensured, and pressure build-up is avoided;
2) sand grains with a certain grain size are filled into the bottom of the double-layer organic glass tube through the sand filling opening 15;
3) the shaft angle is adjusted through the rotating shaft 11 to be fixed, and the dewatering machine 7 is started;
4) starting the air compressor 1, injecting air into the pressure stabilizing tank 3, opening the gate valve 4 at a small flow rate (the flow rate cannot carry sand in the shaft simulation unit) after the preset pressure is reached, checking the air tightness of the whole device and each part unit, confirming that the data of sensors such as each flow rate and pressure in the device are normal, and ensuring that the data acquired by the computer 31 and the acquisition box 32 are error-free;
5) starting a motor and a bevel gear 21 to drive the inner tube 12 and the eccentric drill bit 14 to rotate;
6) adjusting a three-way valve 6 to ventilate the outside of the device, and adjusting a gate valve 4 to obtain airflow with stable flow required by an experiment;
7) adjusting a three-way valve 6 to ventilate the device to obtain the motion state of sand grains in the shaft under stable air flow;
8) collecting pressure and flow data through a computer, starting a camera 29 to collect image information, observing the movement condition of sand grains in the pipe, and recording the experimental phenomenon under the flow;
9) gradually adjusting the flow rate, repeating the step 6-8, and determining the starting flow rate of the sand grains when the flow rate can carry all the sand grains out of the shaft;
10) after the experiment is finished, the rock debris pool 28 is cleaned in time, and residual sand grains in the shaft simulation unit are cleaned through the sand discharge port 17;
11) after the starting flow is determined, preparing a stopwatch, performing 5 groups of experiments with different flows above the starting flow, starting timing when stable airflow is introduced into the pipeline, stopping timing when all sand particles in the pipeline are taken out, and calculating the chip removal rate at the flow;
12) processing experimental data, calculating the chip removal rate, drawing a relation curve of flow and the chip removal rate, and analyzing an experimental phenomenon through the flow and pressure curves;
13) and repeating the steps, developing a parallel experiment and a comparison experiment, and determining the starting flow of different sand grains and the influence of the sand discharge rate of the flow or the angle of different shafts on the sand discharge and the sand discharge rate.
Example 1
The particle size for experiment is 1-3mm, 1800cm3The sand grains are used for carrying out the experiment, the shaft is kept in a vertical state, and after the experiment is carried out according to the experiment steps, pressure data in the experiment are obtained and are shown in figure 3. The sand particles in the experiment ranged from 65s to 460s at a gas flow rate of 128Nm3Under the condition of/h, sand at the bottom of the well enters the well bore, the sand rolls and suspends in the lower part of the well bore, the sand is not continuously collided by the well wall and is not discharged from the well bore, and the pressures of an inlet, the bottom of the well and an outlet of the well bore simulation unit are respectively stabilized at about 3.9KPa, 3.2KPa and 2.1 KPa. In the experiment, in the range of 460s to 740s, when the gas flow reaches 284Nm3During the process of the simulation method, sand at the bottom of the shaft completely and quickly enters the shaft, a small number of sand rolls and suspends in the middle of the shaft at the high part, the sand is not discharged out of the shaft without continuous collision of the shaft wall, most of the sand is discharged out of the shaft and is quickly discharged, the pressures of the inlet, the bottom and the outlet of the shaft simulation unit are respectively stabilized at about 11.8KPa, 11.2KPa and 3.9KPa, and the obtained pressure change graph is shown in figure 3.
Example 2
The particle size for experiment is 1-3mm and 1600cm3After the starting flow is determined, a stopwatch is prepared, 5 groups of experiments with different flows are carried out above the starting flow, timing is started when stable airflow is introduced into the pipeline, timing is stopped when all the sand grains in the pipeline are taken out, the chip removal rate at the flow is calculated, each group of experiments are repeated for 3 times to ensure the accuracy of the experiments, the average value of the chip removal rate at the flow is calculated, and the relation curve of the flow and the chip removal rate is obtained and is shown in figure 4.
Claims (6)
1. A device for simulating the rock carrying of a reverse circulation eccentric flow field of gas drilling is composed of a gas supply unit, a shaft simulation unit, an exhaust and rock debris processing unit, a data and video acquisition unit and a computer processing unit, and is characterized in that the gas supply unit comprises an air compressor (1), a pressure stabilizing tank (3), a gas flowmeter (5), a three-way valve (6) and a dehydrator (7), the air compressor (1) is sequentially connected with the pressure stabilizing tank (3), the three-way valve (6) and the dehydrator (7), the dehydrator is connected with a gas inlet of the shaft simulation unit, and the gas flowmeter (5) is arranged on a connecting pipeline of the pressure stabilizing tank and the three-way valve; the shaft simulation unit comprises an outer pipe (13), an inner pipe (12), an eccentric drill bit (14), a motor, a bevel gear (21), an air inlet (9), an air outlet (25), a sand filling opening (15), a sand discharging opening (17), a rotating shaft (11) and a support (30), wherein the outer pipe (13) simulates a shaft, the inner pipe (12) simulates a drill string, the outer pipe is fixed on the support (30) through the rotating shaft (11), the outer pipe is provided with the air inlet (9), and the air inlet is connected with a water removing machine (7); the inner pipe is connected with a motor and a conical gear (21), an eccentric drill bit (14) is fixed at the bottom of the inner pipe, the motor drives the inner pipe and the eccentric drill bit to rotate, and enough reserved space is reserved below the eccentric drill bit for filling sand to simulate the well bottom condition; the bottom of the outer pipe is provided with a sand filling opening (15) and a sand discharging opening (17); the top of the inner pipe is provided with an air outlet (25), and the inner pipe is connected with an exhaust pipe of the exhaust and rock debris processing unit through the air outlet; pressure sensors (10, 16 and 24) are respectively arranged at the air inlet, the bottom of the outer pipe and the air outlet; the exhaust and rock debris processing unit comprises an exhaust pipe (26), a chip removal pipe (27) and a rock debris pool (28), the exhaust pipe (26) is connected with an air outlet (25) of the shaft simulation unit, the exhaust pipe is connected with the chip removal pipe (27), and an outlet of the chip removal pipe is positioned above the rock debris pool (28); the data and video acquisition unit comprises pressure sensors (10, 16, 24), a gas flowmeter (5) and a camera (29), and the pressure sensors are connected with the computer processing unit; the computer processing unit comprises a data acquisition box (32) and a computer (31).
2. A device for simulating the formation in an anti-circulation eccentric flow field of gas drilling as claimed in claim 1, wherein the eccentric bit (14) is provided with an eccentric water hole (33) as a passage for gas carrying downhole debris up to the annulus.
3. The device for simulating the rock-carrying of the reverse circulation eccentric flow field of the gas drilling as claimed in claim 1, wherein an O-shaped sealing rubber ring (18), a Y-shaped sealing rubber ring (19) and a flange (20) are arranged at the joint of the inner pipe and the outer pipe, and an O-shaped sealing rubber ring (22) and a flange (23) are arranged at the joint of the inner pipe and the exhaust pipe.
4. The device for simulating the rock carrying in the reverse circulation eccentric flow field of the gas drilling as claimed in claim 1, wherein the inner tube and the outer tube of the shaft simulation unit are made of organic glass, and the camera can observe the migration of rock debris in the tubes.
5. The device for simulating reverse circulation eccentric flow field rock-carrying of gas drilling as claimed in claim 1, wherein a filler seal is arranged at the connection part of the pressure sensor and the pipeline to ensure the airtightness of the whole device.
6. A method of simulating gas drilling reverse circulation eccentric flow field rock-carrying using the apparatus of claim 1, 2, 3, 4 or 5, comprising the steps of:
(1) sand grains with certain grain sizes are filled into the space between the bottom of the inner pipe and the bottom of the outer pipe through the sand filling port;
(2) adjusting the angle of a shaft through a rotating shaft, starting an air compressor and a dewatering machine, and injecting air into a pressure stabilizing tank to reach a preset pressure;
(3) starting a motor and a bevel gear to drive the inner pipe and the eccentric drill bit to rotate;
(4) adjusting a pressure stabilizing tank gate valve to obtain airflow with stable flow, and supplying air to an air inlet of the shaft simulation unit through a three-way valve;
(5) a camera observes the rock debris migration condition in the pipe and acquires image information, and a data acquisition box acquires pressure flow data;
(6) gradually regulating the flow rate, repeating the steps, and determining the starting flow rate of the sand grains when all the sand grains are carried out of the shaft under the flow rate;
(7) after the starting flow is determined, carrying out experiments of different flows above the starting flow, starting timing when stable airflow is introduced into the air inlet, stopping when all sand grains are carried out, and calculating the chip removal rate at the flow;
(8) and drawing a relation curve of the flow rate, the chip removal rate and the pressure with time.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114279905A (en) * | 2021-12-30 | 2022-04-05 | 重庆大学 | Device and method for simulating drilling cuttings generation |
| CN115902126A (en) * | 2023-02-20 | 2023-04-04 | 四川职业技术学院 | Method for measuring influence of different foam fluids on reverse circulation well-flushing rock-carrying |
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| US5074366A (en) * | 1990-06-21 | 1991-12-24 | Baker Hughes Incorporated | Method and apparatus for horizontal drilling |
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| CN114279905B (en) * | 2021-12-30 | 2024-03-26 | 重庆大学 | Device and method for simulating generation of drilling cuttings |
| CN115902126A (en) * | 2023-02-20 | 2023-04-04 | 四川职业技术学院 | Method for measuring influence of different foam fluids on reverse circulation well-flushing rock-carrying |
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