CN108952610B - Hydraulic drive coring tool for complex well - Google Patents
Hydraulic drive coring tool for complex well Download PDFInfo
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- CN108952610B CN108952610B CN201811050551.3A CN201811050551A CN108952610B CN 108952610 B CN108952610 B CN 108952610B CN 201811050551 A CN201811050551 A CN 201811050551A CN 108952610 B CN108952610 B CN 108952610B
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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
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors
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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
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors
- E21B25/10—Formed core retaining or severing means
Abstract
The invention relates to a hydraulic drive coring tool for a complex well, belonging to the technical field of petroleum drilling and production downhole tools. It is composed of an inner core barrel component and an outer core barrel component; the outer core barrel assembly consists of an upper joint, a safety joint, an upper spiral centralizer, a middle spiral centralizer and a lower spiral centralizer, and a first section of outer core barrel and a second section of outer core barrel; the inner core barrel assembly consists of an inner barrel upper shaft, a first section of inner core barrel, a second section of inner core barrel and a double-layer aluminum alloy lining barrel; the hanging steel ball is hung on the inner shoulder of the safety joint through the ball hanging runway, the hanging assembly is provided with the cutting sleeve ball seat, and the inner cylinder centering mechanism ensures the centering of the inner cylinder and is suitable for coring in a large inclined shaft; the core gripper assembly consists of a neck sleeve, a clamp type core gripper and a clamp plate type core gripper, the suspension assembly is unlocked when a suspension steel ball is aligned with a ball hole of a clamp sleeve ball seat and slides into the soft stratum, and the clamp plate type core gripper cuts off a core; and (3) raising the pressure of the inner barrel of the hard stratum to hold the pump, lifting the drilling tool when the pressure reaches 16MPa, and clamping and pulling off the core by the clamp type core gripper. The core cutting device is suitable for core cutting operation under different geological conditions.
Description
Technical Field
The invention relates to a hydraulic drive coring tool for a complex well, belonging to the technical field of petroleum drilling and production downhole tools.
Background
Nowadays, oil and gas exploration and development operations are gradually switched from shallow wells, low-pressure wells, low-inclination wells to high-pressure wells, highly-inclined wells and complex wells with soft and hard staggered geological conditions, and conventional coring tools have poor coring effect in complex strata such as the high-pressure wells, the highly-inclined wells, the soft and hard staggered wells and the like, and cannot meet the requirements for obtaining high-quality, large-size and most rock cores. The common self-locking and pressurizing coring tool has small application range and is not precise enough to be applied in a small range; the mechanical pressurizing coring tool widely used in various large oil fields at present has the following defects that firstly, when the well deviation is larger, four input steel balls can be accumulated on one side of the inner wall of the top of a pressurizing rod under the action of gravity, so that when a drilling tool is pressurized downwards, a pin of the coring tool cannot be cut off, and a core clamping accident occurs, so that a clamping plate type core claw cannot contract to cut off a core; secondly, the inner cylinders of some mechanical pressurized coring tools cannot be cleaned automatically, and core blockage is easily caused; thirdly, the drill is stopped when the ball is thrown, which results in long coring time, seriously affects the coring progress and has low working efficiency. Therefore, it is necessary to develop a hydraulic drive coring tool which is driven by hydraulic pressure, is suitable for coring operation of high-pressure wells, highly deviated wells and complex wells with staggered soft and hard stratums, can circularly and automatically clean the inner cylinder and the well bottom of the drilling tool with large displacement, effectively avoids core clamping accidents, can cut the steel ball without stopping drilling, has sharp core cutting, greatly improves coring efficiency, ensures high-quality and large-size coring, is convenient to operate, and is safe and reliable to use.
Disclosure of Invention
The invention aims to provide a hydraulic drive coring tool which is suitable for coring operation of high-pressure wells, highly-deviated wells and complex wells with soft and hard staggered strata, adopts hydraulic drive, can circularly self-clean an inner cylinder and a well bottom in a large discharge amount, effectively avoids core clamping accidents, does not need to stop drilling when throwing steel balls, has sharp core cutting, greatly improves coring efficiency, ensures high-quality and large-size coring, is convenient to operate, and is safe and reliable to use; the problem that in the prior art, when a highly deviated well and a stratum soft and hard staggered complex well are encountered, a pin cannot be cut off, so that a clamp plate type core claw cannot shrink to cut off a core is solved; the core cannot be automatically cleaned from the inner cylinder and the shaft bottom, the core is easily blocked, and the drilling needs to be stopped when the ball is thrown, so that the core taking time is long, the core taking progress is influenced, the working efficiency is low, and the problems of high quality, large size and most quantity of core obtaining requirements cannot be met.
The invention realizes the purpose through the following technical scheme:
a hydraulic drive coring tool for complex wells comprises a bearing hanging shaft, a back pressure valve ball, a back pressure valve seat, a bearing seat, a bidirectional thrust ball bearing, a shearing pin, a neck sleeve, an outer core barrel component, an inner core barrel component, a suspension assembly, an inner barrel centralizing mechanism, a core claw assembly and a coring bit; the method is characterized in that: the outer core barrel assembly is formed by connecting an upper joint, a safety joint, an upper spiral centralizer, a first section of outer core barrel, a middle spiral centralizer, a second section of outer core barrel and a lower spiral centralizer male and female screw thread in sequence; the inner core barrel assembly consists of an inner barrel upper shaft, a first section of inner core barrel, a second section of inner core barrel and a double-layer aluminum alloy lining barrel; the upper shaft of the inner barrel, the first section of inner core barrel and the second section of inner core barrel are connected by a male screw and a female screw in sequence, and the double-layer aluminum alloy lining barrel is arranged on the inner wall of the lower end inner barrel; the suspension assembly consists of a bearing steel ball and a ball hanging runway, the bearing steel ball is suspended on a built-in shoulder of the safety joint through the ball hanging runway, and a clamping sleeve ball seat is arranged inside the upper end of the suspension assembly; the inner cylinder centering mechanism consists of an inner cylinder upper centering body and an inner cylinder lower centering body, the inner cylinder upper centering body is arranged at the upper end of the inner cylinder, and the inner cylinder lower centering body is arranged at the lower end of the inner cylinder, so that centering of the inner cylinder is guaranteed, and the inner cylinder centering mechanism is suitable for coring operation of a large inclined shaft; the rock core claw assembly consists of a necking sleeve, a clamp type rock core claw and a clamping plate type rock core claw, the necking sleeve is connected to the lowest end of the inner cylinder, the clamp type rock core claw is installed in the necking sleeve, and the clamping plate type rock core claw is installed outside the necking sleeve through a male screw and a female screw; the coring bit is connected to the lowest end of the outer cylinder through a male and female screw thread; the upper end of the clamping sleeve ball seat is uniformly provided with a plurality of slope spring pieces with the inclination of 45 degrees along the outer edge, the clamping sleeve ball seat is connected with the bearing and hanging shaft through the slope spring pieces, a ball hole is formed in the clamping sleeve ball seat, the outer surface of the clamping sleeve ball seat below the ball hole is provided with a track groove along the radial direction, the track groove forms a running track of the bearing and hanging steel ball moving up relative position when the clamping sleeve ball seat moves down, and the bearing and hanging steel ball slides into the ball hole of the clamping sleeve ball seat until the relative position of the bearing and hanging steel ball moves to be aligned with the ball hole in the clamping.
An inner hole at the upper end of the necking sleeve is provided with a conical thread, and the necking sleeve is connected with the lower centering body of the inner cylinder through the conical thread; a cone is manufactured at the lower end of the necking sleeve, conical threads are manufactured on the outer surface of the cone, an inner shoulder is manufactured in the middle of the necking sleeve, the clamp type core claw is placed in the cone of the necking sleeve, and the inner shoulder of the necking sleeve ensures that the clamp type core claw does not move upwards along with the drilling tool when the drilling tool is lifted upwards; the inner hole of the clamping plate type rock core claw is provided with a taper thread in a tapping mode, and the clamping plate type rock core claw is connected with the taper thread on the outer surface of the cone of the necking sleeve through the taper thread; when the core is cut in a soft stratum, the hanging steel ball is aligned with a ball hole of the clamping sleeve ball seat, the hanging steel ball slides into the clamping sleeve ball seat, the hanging assembly is unlocked, the clamping plate type core claw is inserted into a slope of the coring bit to clamp the core, and the core is completely contracted and cut off; when cutting cores in hard strata and broken strata, the pump is held back by the inner cylinder due to the rise of pressure, the drilling tool is lifted up when the pressure rises to 16MPa, at the moment, the clamp type core claw and the necking sleeve move upwards along with the drilling tool, the clamp type core claw shrinks and deforms, and the core is clamped and pulled off.
The lower end of a built-in circular bead of the safety joint is provided with a taper buckle in a tapping mode, the safety joint is connected with the upper spiral centralizer through the taper buckle in a threaded mode, when the outer cylinder meets the clamp, the outer cylinder can rotate backwards, the safety joint is separated from the upper spiral centralizer and the outer core cylinder assembly, and the inner cylinder and the core are taken out by the lifting drilling tool.
The bearing and hanging shaft is provided with a hole slightly larger than the diameter of the bearing and hanging steel ball, when the ball hole on the clamping sleeve ball seat is aligned with the bearing and hanging shaft, the bearing and hanging steel ball slides into the clamping sleeve ball seat, the hanging assembly is unlocked, and the function of hanging the inner core barrel assembly is not provided.
The outer side of the back pressure valve seat is provided with threads, the inner wall of the lower end of the bearing and hanging shaft is also provided with threads, and the back pressure valve seat is installed at the lower end inside the bearing and hanging shaft through the threads.
The upper shaft of the inner cylinder is divided into an upper thick section and a lower thin section, the upper thick section is directly installed on the bearing bush, the lower thin section is installed with the bearing bush in an interference fit mode, the outer surface of the lower end of the lower thin section is provided with threads in a tapping mode, and the lower thin section is connected with the upper centering body of the inner cylinder through the threads.
The outer circumference of the inner cylinder upper righting body is equidistantly provided with the inner cylinder upper righting roller, the inner cylinder upper righting roller can roll flexibly at the installation position, and the outer circumference of the inner cylinder upper righting body, which is not provided with the inner cylinder upper righting roller, is provided with an upper righting body through groove along the axial direction, so that the smooth circulation of the drilling fluid is ensured without blockage.
The outer circumference of the inner cylinder lower righting body is provided with inner cylinder lower righting rollers at equal intervals, the inner cylinder lower righting rollers can roll flexibly at the installation position, and the outer circumference of the inner cylinder lower righting body is provided with a lower righting body through groove along the axial direction at the position where the inner cylinder lower righting rollers are not installed, so that the smooth circulation of drilling fluid is ensured without blockage.
The double-layer aluminum alloy lining cylinder is divided into two layers, the first layer is fixed by one shearing pin, the second layer is fixed on the inner wall of the lower end inner cylinder by two shearing pins, the inner wall and the outer wall of the double-layer aluminum alloy lining cylinder are smooth, when a core meets the clamping, the clamped core moves upwards along with the double-layer aluminum alloy lining cylinder, and the double-layer structure of the double-layer aluminum alloy lining cylinder can avoid the core clamping accident of the core twice.
Compared with the prior art, the invention has the beneficial effects that:
the hydraulic drive coring tool for the complex well adopts a hydraulic pressurization drive mode, abandons a heavy mechanical pressurization mechanism, enables the inner cylinder to move downwards through suppressing pressure, enables the rock core claw assembly to contract under the action of pressure, and facilitates core cutting, and is suitable for coring operation of high-pressure wells, highly deviated wells and complex wells with staggered soft and hard stratums; when the coring tool is put into a well, a back pressure valve ball is not arranged, the well can be circularly washed through the inner cylinder with large discharge after drilling, the inner cylinder and the well bottom are cleaned, and the core clamping accident is effectively avoided; when the core is cut, a hydraulic ball is thrown in, the drilling fluid enters the cutting sleeve ball seat through an inner hole channel of the drilling tool by virtue of circulation, the drilling and ball throwing are not stopped, and the core can be cut off in the underground soft stratum by completely contracting the clamping plate type core claw to complete the core cutting process; when encountering underground hard stratum and broken stratum, the inner cylinder holds the pump due to the rise of pressure, so that the clamp type core claw contracts, deforms and clamps and breaks the core; the coring efficiency is greatly improved, high-quality and large-size coring is guaranteed, and the operation is convenient; adopt the ball to hang the mode and replace pin suspension mode and hang and connect the coring tool, effectively avoided because of the fracture accident that the too big cause of shearing force when drilling down, boring, the drill stop takes place, simple structure uses safe and reliable. The problem that the pin cannot be cut off when the high-inclination well and the stratum soft and hard staggered complex well are encountered in the prior art is solved, so that the clamp plate type core claw cannot shrink to cut off the core; and the inner cylinder can not be self-cleaned, so that the core is easily blocked, and the drill needs to be stopped when the ball is thrown, so that the core taking time is long, the core taking progress is influenced, the working efficiency is low, and the problems of high quality, large size and most of core obtaining requirements can not be met. Greatly improves the coring efficiency and quality and brings new vitality for the petroleum drilling and production industry.
Drawings
FIG. 1 is a schematic cross-sectional view of a hydraulically driven coring tool for complex wells;
FIG. 2 is a schematic axial view of the inner barrel;
FIG. 3 is a schematic structural view of a ferrule ball seat;
FIG. 4 is a schematic structural view of a suspension assembly;
FIG. 5 is a schematic structural view of a centralizer on the inner barrel;
FIG. 6 is a schematic structural view of a centralizing body under the inner cylinder;
fig. 7 is a schematic structural view of a core gripper assembly.
In the figure: 1. an upper joint, 2, a safety joint, 3, a hydraulic ball, 4, a bearing steel ball, 5, a ball hanging runway, 6, a cutting sleeve ball seat, 7, an upper spiral centralizer, 8, a bearing hanging shaft, 9, a back pressure valve ball, 10, a back pressure valve seat, 11, a bearing seat, 12, a bidirectional thrust ball bearing, 13, a bearing bush, 14, an inner cylinder upper centralizing roller, 15, an inner cylinder upper centralizing body, 16, an inner cylinder upper shaft, 17, a first section of inner core barrel, 18, a first section of outer core barrel, 19, a middle spiral centralizer, 20, a second section of inner core barrel, 21, a second section of outer core barrel, 22, a double-layer aluminum alloy lining barrel, 23, a shearing pin, 24, an inner cylinder lower centralizing body, 25, an inner cylinder lower centralizing roller, 26, a lower spiral centralizer, 27, a necking sleeve, 28, a cutting sleeve type core claw, 29, a cutting plate type drill bit, 30 and a core picking bit;
6-1 parts of a slope spring piece, 6-2 parts of a ball hole, 6-3 parts of a track groove;
15-1, an upper centralizing body through groove, and 24-1, a lower centralizing body through groove.
Detailed Description
Embodiments of the hydraulically driven coring tool for complex wells are described in further detail below with reference to the accompanying drawings (see FIGS. 1-7):
a hydraulic drive coring tool for complex wells comprises a bearing hanging shaft 8, a back pressure valve ball 9, a back pressure valve seat 10, a bearing seat 11, a bidirectional thrust ball bearing 12, a shearing pin 23, a necking sleeve 27, an outer core barrel component, an inner core barrel component, a suspension assembly, an inner barrel centering mechanism, a core claw assembly and a coring bit 30; the outer rock core barrel assembly is formed by connecting an upper connector 1, a safety connector 2, an upper spiral centralizer 7, a first section of outer rock core barrel 18, a middle spiral centralizer 19, a second section of outer rock core barrel 21 and a lower spiral centralizer 26 through male and female threads in sequence; the inner core barrel assembly consists of an inner barrel upper shaft 16, a first section of inner core barrel 17, a second section of inner core barrel 20 and a double-layer aluminum alloy lining barrel 22; the inner barrel upper shaft 16, the first section of inner core barrel 17 and the second section of inner core barrel 20 are connected through a male screw and a female screw in sequence, and the double-layer aluminum alloy lining barrel 22 is installed on the inner wall of the lower end inner barrel; the suspension assembly consists of a steel ball 4 and a ball-hanging runway 5, the steel ball 4 is suspended on the built-in shoulder of the safety joint 2 through the ball-hanging runway 5, and a clamping sleeve ball seat 6 is arranged in the upper end of the suspension assembly; the inner cylinder centering mechanism consists of an inner cylinder upper centering body 15 and an inner cylinder lower centering body 24, wherein the inner cylinder upper centering body 15 is arranged at the upper end of the inner cylinder, and the inner cylinder lower centering body 24 is arranged at the lower end of the inner cylinder, so that centering of the inner cylinder is ensured, and the inner cylinder centering mechanism is suitable for coring operation of a large inclined shaft; the rock core claw assembly consists of a necking sleeve 27, a clamp type rock core claw 28 and a clamp plate type rock core claw 29, wherein the necking sleeve 27 is arranged at the lowest end of the inner cylinder, the clamp type rock core claw 28 is arranged in the necking sleeve 27, and the clamp plate type rock core claw 29 is arranged outside the necking sleeve 27 through a male-female buckle; the coring bit 30 is connected to the lowest end of the outer cylinder through a male-female buckle; the clamping sleeve ball seat is characterized in that a plurality of slope spring pieces 6-1 with the inclination of 45 degrees are uniformly arranged on the outer edge of the upper end of the clamping sleeve ball seat 6, the clamping sleeve ball seat 6 is connected with a bearing hanging shaft 8 through the slope spring pieces 6-1, a ball hole 6-2 is formed in the clamping sleeve ball seat 6, a track groove 6-3 is formed in the outer surface of the clamping sleeve ball seat 6 below the ball hole 6-2 along the radial direction, the track groove 6-3 forms a running track for enabling the bearing hanging steel ball 4 to move upwards at a relative position when the clamping sleeve ball seat 6 descends, until the relative position of the bearing hanging steel ball 4 moves to the position where the bearing hanging shaft 8 is aligned with the ball hole 6-2 in the clamping sleeve ball seat 6, and the bearing hanging steel ball.
The inner hole at the upper end of the necking sleeve 27 is tapped with a taper thread, and the necking sleeve 27 is connected with the inner cylinder lower righting body 24 through the taper thread; a cone is manufactured at the lower end of the necking sleeve 27, a conical thread is manufactured on the outer surface of the cone, an inner shoulder is manufactured in the middle of the necking sleeve 27, the clamp type core claw 28 is placed in the cone of the necking sleeve 27, and the inner shoulder of the necking sleeve 27 ensures that the clamp type core claw 28 does not move upwards along with a drilling tool when a drilling tool is lifted; the inner hole of the clamping plate type rock core claw 29 is tapped with a conical thread, and the clamping plate type rock core claw 29 is connected with the conical thread on the outer surface of the cone of the necking sleeve 27 through the conical thread; when the core is cut in a soft stratum, the hanging steel ball 4 is aligned with the hole of the cutting sleeve ball seat 6, the hanging steel ball slides into the cutting sleeve ball seat 6, the hanging assembly is unlocked, the clamping plate type core claw 29 is inserted into the slope of the coring bit 30 to clamp the core, and the core is completely contracted and cut off; when cutting cores in hard strata and broken strata, the inner cylinder is pumped by pressure rising, when the pressure rises to 16MPa, the drilling tool starts to be lifted, at the moment, the clamp type core claw 28 and the necking sleeve 27 ascend together with the drilling tool, the clamp type core claw 28 shrinks and deforms, and the core is clamped and pulled off.
The lower end of a built-in circular bead of the safety joint 2 is tapped with a taper buckle, the safety joint 2 is connected with the upper spiral centralizer 7 through the taper buckle in a threaded mode, when the outer cylinder is clamped, the outer cylinder can rotate to be reversed, the safety joint 2 is separated from the upper spiral centralizer 7 and the outer core cylinder assembly, and the inner cylinder and the core are taken out by a drilling tool.
The bearing and hanging shaft 8 is provided with a hole slightly larger than the diameter of the bearing and hanging steel ball 4, when the ball hole 6-2 on the cutting sleeve ball seat 6 is aligned with the hole of the bearing and hanging shaft 8, the bearing and hanging steel ball 4 slides into the ball hole 6-2 of the cutting sleeve ball seat 6, the hanging assembly is unlocked, and the function of hanging the inner core barrel assembly is not provided.
The outer side of the back pressure valve seat 10 is provided with threads, the inner wall of the lower end of the bearing and hanging shaft 8 is also provided with threads, and the back pressure valve seat 10 is installed at the lower end inside the bearing and hanging shaft 8 through the threads.
The inner cylinder upper shaft 16 is divided into an upper thick section and a lower thin section, the upper thick section is directly installed on the bearing bush 13, the lower thin section is installed with the bearing bush 13 in an interference fit mode, the outer surface of the lower end of the lower thin section is provided with threads in a tapping mode, and the lower thin section is connected with the inner cylinder upper centering body 15 through the threads.
6 inner cylinder upper centering rollers 14 are equidistantly arranged on the outer circumference of the inner cylinder upper centering body 15, the inner cylinder upper centering rollers 14 can flexibly roll at the installation position, and an upper centering body through groove 15-1 is axially formed in the position, where the inner cylinder upper centering rollers 14 are not installed, on the outer circumference of the inner cylinder upper centering body 15, so that smooth circulation of drilling fluid is ensured without blockage.
6 inner cylinder lower righting rollers 25 are equidistantly installed on the outer circumference of the inner cylinder lower righting body 24, the inner cylinder lower righting rollers 25 can roll flexibly at the installation position, and a lower righting body through groove 24-1 is formed in the position, where the inner cylinder lower righting rollers 25 are not installed, on the outer circumference of the inner cylinder lower righting body 24 along the axial direction, so that smooth circulation and no blockage of drilling fluid are guaranteed.
The double-layer aluminum alloy lining cylinder 22 is divided into two layers, the first layer is fixed by one shearing pin 23, the second layer is fixed on the inner wall of the lower end inner cylinder by two shearing pins 23, the inner wall and the outer wall of the double-layer aluminum alloy lining cylinder 22 are smooth, when a core meets a clamp, the clamped core moves upwards along with the double-layer aluminum alloy lining cylinder 22, and the double-layer structure of the double-layer aluminum alloy lining cylinder 22 can avoid the core clamping accident of the core twice (see fig. 1-7).
The working principle of the hydraulic drive coring tool for complex wells is as follows:
before core drilling: when the coring tool is put into a well, the back pressure valve ball 9 is not arranged, after the coring tool is drilled, the inner cylinder and the well bottom can be cleaned through the large-displacement circulating water of the inner cylinder, then the back pressure valve ball 9 is put into the well, the back pressure valve ball 9 is finally located on the back pressure valve seat 10 to block a channel for the drilling fluid to enter the inner cylinder, and then the drilling fluid enters the annular space of the inner cylinder and the outer cylinder through the water diversion hole on the bearing and hanging shaft 8;
during core drilling: the outer core barrel assembly of the coring tool of the present invention: the upper joint 1, the safety joint 2, the upper spiral centralizer 7, the first section of outer core barrel 18, the middle spiral centralizer 19, the second section of outer core barrel 21 and the lower spiral centralizer 26 rotate along with the drilling tool to drive the coring bit 30 to crush the rock stratum; inner core barrel assembly: the inner barrel upper shaft 16, the first section of inner core barrel 17, the second section of inner core barrel 20 and the double-layer aluminum alloy lining barrel 22 are kept still through the bidirectional thrust ball bearing 12, so that the drilled core overcomes the frictional resistance of the clamp type core claw 28 and enters the second section of inner core barrel 20 and the first section of inner core barrel 17 through the double-layer aluminum alloy lining barrel 22;
when cutting the core: a hydraulic ball 3 is thrown in, the hydraulic ball 3 enters the cutting sleeve ball seat 6 through an inner hole channel of the drilling tool by means of circulating drilling fluid, the hydraulic ball 3 blocks the circulating channel after reaching the cutting sleeve ball seat 6, the pressure of a drilling pump is randomly raised, and a slope spring piece 6-1 of the cutting sleeve ball seat 6 is forced to shrink under the action of hydraulic pressure, so that the cutting sleeve ball seat 6 moves downwards; when the cutting sleeve ball seat 6 moves downwards to a certain distance, the ball hole 6-2 on the cutting sleeve ball seat 6 is aligned with the hanging steel ball 4, the hanging steel ball 4 slides into the cutting sleeve ball seat 6 (the hanging steel ball 4 is static in practice), the hanging assembly is unlocked, the function of hanging the inner cylinder assembly is no longer provided, the inner cylinder loses support and rapidly falls under the action of self weight, the clamping plate type core claw 29 connected with the inner cylinder claw is driven to be inserted into the slope of the coring bit 30, and the clamping plate type core claw 29 wraps and clamps the core to a certain extent; when the cutting sleeve ball seat 6 touches the return pressure valve seat 10, the cutting sleeve ball seat cannot move downwards continuously, the drilling pump continues to pressurize, and the whole inner cylinder moves downwards continuously under the action of high pressure;
for soft stratum, the clamping plate type core claw 29 can be completely contracted to cut off the core, and the core cutting process is completed; for hard strata and broken strata, the clamp plate type core claw 29 cannot completely shrink to cut off the core, the inner cylinder cannot move downwards continuously at the moment, the pressure of the inner cylinder rises to hold the pump, when the pressure of the inner cylinder rises to 16MPa, pressurization is not continued, the coring tool starts to be lifted upwards, the clamp type core claw 28 moves upwards along with the drilling tool because of the relative static friction between the clamp type core claw 28 and the core, and under the action of the inner conical surface of the clamp sleeve 27, the clamp type core claw 28 is forced to shrink and deform, so that the core is clamped and pulled off.
The hydraulic drive coring tool for the complex well is suitable for coring in hard strata, soft strata, broken strata and large inclined wells; the core is cut by adopting hydraulic pressure, the traditional complicated and heavy structure of mechanical pressure is abandoned, and the structure and the core taking process of the core taking tool are simplified. The inner diameter of the inner barrel is 127mm, the core with the diameter of 120mm can be cut to the maximum extent, and the core taking size is large, so that the core taking device is more beneficial to the analysis and research of the core.
The core claw assembly is made by compounding a clamp type core claw 28 and a clamp plate type core claw 29, and can be suitable for cutting and coring soft and hard strata simultaneously. An inner cylinder centralizing mechanism consisting of an inner cylinder upper centralizing body 15 and an inner cylinder lower centralizing body 24 is respectively arranged at the upper part and the lower part of the inner cylinder, so that the centering of the inner cylinder is powerfully ensured, and the inner cylinder is completely suitable for the coring operation of a large inclined shaft. The outer cylinder is provided with an upper spiral centralizer 7, a middle spiral centralizer 19 and a lower spiral centralizer 26, and the three centralizers can ensure the rigidity of the outer cylinder and the stable work of the down-hole coring tool. The lower helical centralizer 26 also improves well bore quality and the life of the core bit 30. The double-layer aluminum alloy lining cylinder 22 arranged in the inner wall of the lower end of the inner cylinder can solve the problem of core clamping twice. The cutting sleeve ball seat 6 is a core part for realizing the hydraulic pressurization function; the core claw assembly is connected to the lowest end of the inner cylinder, so that core cutting operation under different geological conditions is realized.
The technical requirements for installing the hydraulic drive coring tool for the complex well are as follows: 1) cleaning each connecting screw thread of the inner cylinder and the outer cylinder, and coating high-quality screw thread oil;
2) when the clamping plate type core claw 29 is assembled, the axial clearance between the clamping plate type core claw and the core bit 30 is 8-13 mm;
3) the bearing is smooth and clean without stains, the total wear rate of the bearing steel balls and the steel ball track is limited to 3-5mm, and the rotation is flexible;
4) when the inner cylinder and the outer cylinder are assembled, flaw detection is performed firstly, no crack, no burr, no foreign matter and no pit exceeding 3mm exist, and the smoothness of the inner cylinder and the outer cylinder is ensured;
5) after the coring tool is installed, the outer surface of the coring tool is coated with antirust paint.
While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (8)
1. A hydraulic drive coring tool for complex wells comprises a bearing and hanging shaft (8), a back pressure valve ball (9), a back pressure valve seat (10), a bearing seat (11), a bidirectional thrust ball bearing (12), a shearing pin (23), a neck sleeve (27), an outer core barrel component, an inner core barrel component, a hanging assembly, an inner barrel centering mechanism, a core claw assembly and a coring bit (30); the method is characterized in that: the outer rock core barrel assembly is formed by connecting an upper connector (1), a safety connector (2), an upper spiral centralizer (7), a first section of outer rock core barrel (18), a middle spiral centralizer (19), a second section of outer rock core barrel (21) and a lower spiral centralizer (26) through male and female screw threads in sequence; the inner core barrel assembly consists of an inner barrel upper shaft (16), a first section of inner core barrel (17), a second section of inner core barrel (20) and a double-layer aluminum alloy lining barrel (22); an inner cylinder upper shaft (16), a first section of inner core cylinder (17) and a second section of inner core cylinder (20) are sequentially connected through male and female screw threads, and a double-layer aluminum alloy lining cylinder (22) is arranged on the inner wall of the lower end inner cylinder; the suspension assembly consists of a steel ball bearing and hanging (4) and a ball-hanging runway (5), the steel ball bearing and hanging (4) is suspended on a built-in shoulder of the safety joint (2) through the ball-hanging runway (5), and a clamping sleeve ball seat (6) is arranged inside the upper end of the suspension assembly; the inner cylinder centering mechanism consists of an inner cylinder upper centering body (15) and an inner cylinder lower centering body (24), wherein the inner cylinder upper centering body (15) is arranged at the upper end of the inner cylinder, and the inner cylinder lower centering body (24) is arranged at the lower end of the inner cylinder, so that centering of the inner cylinder is ensured, and the inner cylinder centering mechanism is suitable for coring operation of a large inclined shaft; the rock core claw assembly consists of a necking sleeve (27), a clamp type rock core claw (28) and a clamp plate type rock core claw (29), the necking sleeve (27) is connected to the lowest end of the inner cylinder, the clamp type rock core claw (28) is installed in the necking sleeve (27), and the clamp plate type rock core claw (29) is connected to the outside of the necking sleeve (27) through a male screw and a female screw; an inner hole at the upper end of the neck reducing sleeve (27) is tapped with a taper thread, and the neck reducing sleeve (27) is connected with the inner cylinder lower centralizing body (24) through the taper thread; a cone is manufactured at the lower end of the neck sleeve (27), a cone thread is manufactured on the outer surface of the cone, an inner shoulder is manufactured in the middle of the neck sleeve (27), the clamp type rock core claw (28) is placed in the cone of the neck sleeve (27), and the inner shoulder of the neck sleeve (27) ensures that the clamp type rock core claw (28) does not move upwards along with the drilling tool when the drilling tool is lifted; conical threads are tapped on an inner hole of the clamping plate type rock core claw (29), and the clamping plate type rock core claw (29) is connected with the conical threads on the outer surface of the cone of the necking sleeve (27) through the conical threads; when the core is cut in a soft stratum, the hanging steel ball (4) is aligned with a ball hole (6-2) of the clamping sleeve ball seat (6), the hanging steel ball slides into the clamping sleeve ball seat (6), the hanging assembly is unlocked, the clamping plate type core claw (29) is inserted into a slope of a coring bit (30) to clamp the core, and the core is completely contracted to cut off the core; when cutting cores in hard strata and broken strata, the inner cylinder is pumped by pressure rising, when the pressure rises to 16MPa, the drilling tool is lifted, at the moment, the clamp type core claw (28) and the necking sleeve (27) move upwards along with the drilling tool, the clamp type core claw (28) shrinks and deforms, and the core is clamped and pulled off; the coring bit (30) is connected to the lowest end of the outer cylinder through a male and female screw thread; the clamping sleeve ball seat is characterized in that a plurality of slope spring pieces (6-1) with the inclination of 45 degrees are uniformly arranged on the outer edge of the upper end of the clamping sleeve ball seat (6), the clamping sleeve ball seat (6) is connected with a bearing and hanging shaft (8) through the slope spring pieces (6-1), a ball hole (6-2) is formed in the clamping sleeve ball seat (6), a track groove (6-3) is formed in the outer surface of the clamping sleeve ball seat (6) below the ball hole (6-2) along the radial direction, the track groove (6-3) forms a running track of the bearing and hanging steel ball (4) moving up to a relative position when the clamping sleeve ball seat (6) moves down, until the relative position of the bearing and hanging steel ball (4) moves to align the bearing and hanging shaft (8) with the ball hole (6-2) in the clamping sleeve ball seat (6), and the bearing and hanging steel ball (4) slides.
2. A hydraulically driven coring tool for complex wells as defined in claim 1, wherein: the lower end of a built-in shoulder of the safety joint (2) is tapped with a taper buckle, the safety joint (2) is connected with the upper spiral centralizer (7) through the taper buckle in a threaded manner, when the outer cylinder is clamped, the outer cylinder can rotate backwards, so that the safety joint (2) is separated from the upper spiral centralizer (7) and the outer core cylinder assembly, and the inner cylinder and the core are taken out by a lifting drilling tool.
3. A hydraulically driven coring tool for complex wells as defined in claim 1, wherein: bearing and hanging axle (8) on open and to have a hole that slightly is greater than bearing and hanging steel ball (4) diameter, when ball hole (6-2) on cutting ferrule ball seat (6) and bearing and hanging axle (8) are right-hand time, bearing and hanging steel ball (4) just slip into cutting ferrule ball seat (6), hang the assembly unblock, no longer possess the function of hanging interior core section of thick bamboo subassembly.
4. A hydraulically driven coring tool for complex wells as defined in claim 1, wherein: the outer side of the back pressure valve seat (10) is provided with threads, the inner wall of the lower end of the bearing and hanging shaft (8) is also provided with threads, and the back pressure valve seat (10) is arranged at the lower end inside the bearing and hanging shaft (8) through the threads.
5. A hydraulically driven coring tool for complex wells as defined in claim 1, wherein: the inner cylinder upper shaft (16) is divided into an upper thick section and a lower thin section, the upper thick section is directly installed on the bearing bush (13), the lower thin section is installed with the bearing bush (13) in an interference fit mode, the outer surface of the lower end of the lower thin section is provided with threads in a tapping mode, and the lower thin section is connected with the inner cylinder upper centering body (15) through the threads.
6. A hydraulically driven coring tool for complex wells as defined in claim 1, wherein: six inner cylinder upper centering rollers (14) are equidistantly arranged on the outer circumference of the inner cylinder upper centering body (15), the inner cylinder upper centering rollers (14) can flexibly roll at the installation position, and an upper centering body through groove (15-1) is axially formed in the position, on the outer circumference of the inner cylinder upper centering body (15), where the inner cylinder upper centering rollers (14) are not installed, so that the smooth circulation of drilling fluid is ensured without blockage.
7. A hydraulically driven coring tool for complex wells as defined in claim 1, wherein: six inner cylinder lower righting rollers (25) are equidistantly arranged on the outer circumference of the inner cylinder lower righting body (24), the inner cylinder lower righting rollers (25) can flexibly roll at the installation position, and a lower righting body through groove (24-1) is formed in the outer circumference of the inner cylinder lower righting body (24) along the axial direction at the position where the inner cylinder lower righting rollers (25) are not installed, so that the smooth circulation of drilling fluid is ensured without blockage.
8. A hydraulically driven coring tool for complex wells as defined in claim 1, wherein: the double-layer aluminum alloy lining cylinder (22) is divided into two layers, the first layer is fixed by one shearing pin (23), the second layer is fixed on the inner wall of the lower end inner cylinder by two shearing pins (23), the inner wall and the outer wall of the double-layer aluminum alloy lining cylinder (22) are smooth, when the core is blocked, the blocked core moves upwards along with the double-layer aluminum alloy lining cylinder (22), and the two-layer structure of the double-layer aluminum alloy lining cylinder (22) can avoid the core blocking accident twice.
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| CN201811050551.3A CN108952610B (en) | 2018-09-10 | 2018-09-10 | Hydraulic drive coring tool for complex well |
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| CN110253642B (en) * | 2019-06-24 | 2020-10-09 | 濮阳市创立石油机械有限公司 | Sucker rod centralizer crusher and crushing method thereof |
| CN110374534A (en) * | 2019-07-16 | 2019-10-25 | 蒋峰 | A kind of soft or hard layer coring tool of petroleum |
| CN110454105B (en) * | 2019-08-27 | 2022-01-28 | 重庆安标检测研究院有限公司 | In-situ test system and method for gas content of coal mine underground coal seam while drilling |
| CN112502655B (en) * | 2020-11-30 | 2021-09-28 | 中国地质大学（北京） | Shale coring device |
| CN113266292B (en) * | 2021-05-14 | 2023-06-20 | 安徽优特公路养护科技有限公司 | Anti-sticking bores coring device |
| CN114000843B (en) * | 2021-10-19 | 2024-02-23 | 中国海洋石油集团有限公司 | Coring tool suitable for well drilling of super temperature high pressure well |
| CN114592814A (en) * | 2022-03-17 | 2022-06-07 | 大庆市达美石油装备制造有限公司 | Soft and hard stratum airtight coring device |
| CN114718492A (en) * | 2022-04-28 | 2022-07-08 | 大庆市达美石油装备制造有限公司 | Soft stratum core grabbing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2137710Y (en) * | 1992-07-27 | 1993-07-07 | 大庆石油管理局钻井一公司 | Core receiver for soft cataclasite layer |
| CN2213837Y (en) * | 1994-05-27 | 1995-11-29 | 辽河石油勘探局钻采工艺研究院 | Porous Stratigraphic coring tool |
| CN2761822Y (en) * | 2004-10-21 | 2006-03-01 | 辽河石油勘探局 | Coring tool of glass reinforced plastic |
| CN202914002U (en) * | 2012-10-09 | 2013-05-01 | 中国地质科学院勘探技术研究所 | Ball suspension type core catcher coring drill |
| CN104153734B (en) * | 2014-08-27 | 2017-01-25 | 四川川庆石油钻采科技有限公司 | Hydraulic pressure type coring tool |
| US10577880B2 (en) * | 2014-10-10 | 2020-03-03 | Specialised Oilfield Services Pty Ltd | Device and system for use in monitoring coring operations |
| CN204212724U (en) * | 2014-10-21 | 2015-03-18 | 中国石油天然气集团公司 | Integrated form coring tool |
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