CN216665544U - Directional coring tool - Google Patents

Abstract

The patent discloses a directional coring tool, hang joint, suspension assembly, go up urceolus centralizer, outer core section of thick bamboo, urceolus centralizer down, interior core section of thick bamboo, pressure cover, rock core claw, coring bit loop through threaded connection. The inner core barrel is hung by a pin, the cutting core is mechanically pressurized, safety and reliability are realized, and the display of the cutting core can be observed on the ground. After the coring drilling is finished, the drilling tool is slid, the pressure bearing seat transmits the pressure to the pin, the pin is cut off, the suspension assembly, the pressure bearing seat and the inner core barrel are smashed, the core claw is forced to shrink along the conical surface of the inner cavity of the coring bit, and the core is cut off and wrapped, so that the purpose of coring is achieved. The core claw adopts a main and auxiliary graver form, is a triangular hard alloy cutter strip, and solves the problems that two centralizing blocks with flat tops can only perform centralizing action but cannot stop rotating, and a graver can easily carve a spiral curve or a left-right swinging line on the surface of a core and cannot carve a straight line in the prior art.

Description

Directional coring tool

Technical Field

The utility model relates to the technical field of petroleum and natural gas drilling operation, in particular to a directional coring tool used in the field of petroleum and natural gas exploration and development and a method for operating by using the coring tool.

Background

With the development of drilling technologies at home and abroad and the increase of construction of directional wells and horizontal wells, the requirements on corresponding drilling coring technologies are higher and higher, and the conventional, closed and original directional well coring tools cannot completely meet the requirements of geological departments on evaluation of oil and gas reservoirs in operation.

The core taken out by the conventional coring tool only can reflect the rock structure and physical properties of the stratum and the depth and thickness of the reservoir.

The closed core-taking tool can reflect the original oil-water saturation of the stratum, but cannot recover the core taken out to the true state of the stratum.

The core of the original directional well coring tool cannot acquire the direction of a stratum fracture, the direction and the inclination angle of a stratum and the anisotropy of the stratum.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects in the prior art and provide a directional coring tool.

The technical scheme is as follows:

a directional coring tool comprises a tool main body consisting of a positioning joint 1, an upper outer cylinder centralizer 7, an outer core cylinder 8, a lower outer cylinder centralizer 10 and a coring bit 14 which are sequentially connected by threads;

the tool main body is internally provided with a bearing seat 2, a suspension joint 5, a suspension assembly 6, an inner core barrel 9, a pressing sleeve 11 and a core claw 13 from top to bottom in sequence; the pressure bearing seat 2 is sleeved in the positioning joint 1 through a shearing pin;

the upper end of a suspension joint 5 is sleeved between a positioning joint 1 and the lower end of a bearing seat 2, the upper ends of the positioning joint 1, the suspension joint 5 and the lower end of the bearing seat 2 are in clearance fit, radial through holes are formed in the upper ends of the positioning joint 1, the suspension joint 5 and the lower end of the bearing seat 2, the diameter of each radial through hole is larger than that of a first steel ball 4, a ball sleeve 3 is in threaded connection with the outer end of each radial through hole of the positioning joint 1, the radial through holes in the upper ends of the positioning joint 1 and the suspension joint 5 are in corresponding position, the radial through hole in the lower end of the bearing seat 2 is higher than that in the upper end of the suspension joint 5, and the first steel ball 4 is arranged between the radial through holes in the upper ends of the positioning joint 1 and the suspension joint 5 to axially fix the positioning joint 1 and the suspension joint 5;

the suspension assembly 6 is rotatably sleeved at the lower end of the suspension joint 5 through a bearing assembly;

the lower end of the positioning joint 1 is connected with the upper end of an upper outer cylinder centralizer 7 through a threaded buckle, the lower end of the upper outer cylinder centralizer 7 is connected with the upper end of an outer core cylinder 8 through a threaded buckle, the lower end of the outer core cylinder 8 is connected with the upper end of a lower outer cylinder centralizer 10 through a threaded buckle, and the lower end of the lower outer cylinder centralizer 10 is connected with the upper end of a coring drill bit 14 through a threaded buckle;

the lower end of the water distribution joint 6-6 is in threaded connection with the inner core barrel 9 through external threads, the lower end of the inner core barrel 9 is in threaded buckle connection with the upper end of the pressing sleeve 11, and the lower end of the pressing sleeve 11 is in threaded buckle connection with the upper end of the core claw 13;

the lower end of the pressing sleeve 11 and the upper end of the core claw 13 are provided with limiting steps, the adjusting ring 12 is located between the limiting steps, and axial movement is limited by extrusion of the pressing sleeve 11 and the core claw 13.

Further, the suspension assembly 6 comprises a bearing assembly, a suspension shaft 6-2, a water distribution joint 6-6 and a ball seat 6-7;

the bearing assembly comprises a bearing box 6-1, a bearing support 6-5 and a second steel ball 6-3;

the lower end of the suspension joint 5 is in threaded connection with the upper end of the bearing box 6-1, and the internal thread at the lower end of the bearing box 6-1 is in threaded connection with the external thread at the upper end of the bearing support 6-5; the external thread at the lower end of the suspension shaft 6-2 is connected with the internal thread at the upper end of the water distribution joint 6-6, and the internal thread at the lower end of the water distribution joint 6-6 is connected with the external thread at the upper end of the ball seat 6-7; the suspension shaft 6-2 is rotatably sleeved in the bearing box 6-1 through a bearing assembly;

the inner wall of the lower end of the bearing box 6-1 and the outer wall of the suspension shaft 6-2 are provided with limiting steps, two opposite annular grooves are formed between the limiting steps and the upper end face of the bearing support 6-5 and the upper end face of the water distribution joint 6-6 respectively, the bearing ring 6-4 is sleeved in the annular grooves, and the second steel ball 6-3 is embedded in the bearing ring 6-4.

Further, the suspension assembly 6 comprises a bearing assembly, a suspension shaft 6-2, a water distribution joint 6-6 and a ball seat 6-7;

the bearing assembly comprises a bearing box 6-1, a first thrust bearing 18-3 and a bearing support 6-5;

the lower end of the suspension joint 5 is in threaded connection with the upper end of the bearing box 6-1, and the internal thread at the lower end of the bearing box 6-1 is connected with the external thread at the upper end of the bearing support 6-5; the external thread at the lower end of the suspension shaft 6-2 is connected with the internal thread at the upper end of the water distribution joint 6-6, and the internal thread at the lower end of the water distribution joint 6-6 is connected with the external thread at the upper end of the ball seat 6-7; the suspension shaft 6-2 is rotatably sleeved in the bearing box 6-1 through a bearing assembly;

the inner wall of the lower end of the bearing box 6-1 and the outer wall of the suspension shaft 6-2 are provided with limiting steps, two opposite annular grooves are formed between the limiting steps and the upper end face of the bearing support 6-5 and the upper end face of the water distribution joint 6-6 respectively, and the first thrust bearing 18-3 is sleeved in the annular grooves.

Furthermore, the bearing assembly also comprises a second thrust bearing 18-4, the number of the limiting steps on the outer wall of the suspension shaft 6-2 is two, one of the limiting steps divides the annular groove on the outer wall of the suspension shaft 6-2 into an upper part and a lower part, and the second thrust bearing 18-4 is arranged in the annular groove below.

Further, the device also comprises an upper roller righting bearing 19-1 and a lower roller righting bearing 19-2, wherein a limit step is arranged outside the upper end of the upper outer barrel righting device 7, and the limit step and the lower end face of the water distribution joint 6-6 form a ring groove; a limiting step is arranged outside the coring bit 14 to form an annular groove with the outer wall of the core claw 13; the upper roller centering bearing 19-1 and the lower roller centering bearing 19-2 are respectively arranged in the ring grooves.

Further, a core directional burin is embedded and welded on the inner wall of the lower end of the core claw 13.

Further, the core orientation graver comprises a left righting graver 13-1, a right righting graver 13-2 and a main graver 13-3 which are circumferentially arranged at unequal intervals.

Further, the directional graver for the rock core is a triangular hard alloy knife strip.

Furthermore, the upper end of the bearing seat 2 is provided with a limit step with an extending diameter larger than the inner diameter of the suspension joint 5, after the shear pin is cut off and the bearing seat 2 falls down, the limit step at the upper end of the bearing seat 2 is clamped and hung at the upper end of the suspension joint 5, and a radial through hole on the bearing seat 2 is opposite to a radial through hole on the suspension joint 5.

Further, during coring, the shearing pin is sheared, the bearing seat 2 falls, the radial through hole of the bearing seat 2 is opposite to the radial through hole of the suspension joint 5, the first steel ball 4 rolls out of the ball sleeve 3, the suspension assembly 6, the bearing seat 2 and the inner core barrel 9 are hammered down, the core claw 13 is forced to shrink along the conical surface of the inner cavity of the coring bit 14, and the core is cut off and wrapped, so that the purpose of coring is achieved.

Furthermore, three spring gravers 16 are arranged in the pressing sleeve 11, the spring gravers 16 protrude out of the inner wall of the pressing sleeve 11, and each spring graver 16 comprises cutter teeth 16-1 and a spring piece 16-2; the cutter teeth 16-1 are welded at one end of the spring piece 16-2, and a rivet hole is formed at the other end of the spring piece 16-2; the spring nicking tool 16 is connected with the pressing sleeve 11 through a rivet.

Further, the cutter tooth 16-1 is made of hard alloy.

The utility model has the beneficial effects that:

by using the scoring knife on the core claw and the ground repositor, formation cracks and occurrence can be intuitively observed from the core; the measurement and interpretation of the core cracks are carried out on site, and after the core is drilled, the influence of stress release deformation on the core is little, the artificial damage is small, and the error of the measurement result is small; geological data such as stratum trend, dip angle, stratum deposition direction, stratum permeability direction, well inclination angle, well hole azimuth and the like can be effectively obtained.

The tool adopts a pressurizing core cutting mechanism with a telescopic function, is particularly suitable for core cutting operation of soft strata, and can ensure the core harvesting rate; the inner core barrel is suspended by pins, the cutting core is mechanically pressurized, safety and reliability are realized, and the display of the cutting core can be observed on the ground; the inner cylinder adopts large marbles, a suspension bearing without a cartridge clip is adopted, the rotation is flexible, and the service life is long; the core claw for cutting the core is reversely buckled and connected with the inner cylinder, so that the core claw is not reversely buckled in the drilling process. The core claw adopts a main and auxiliary graver form, is a triangular hard alloy cutter strip, and solves the problems that two centralizing blocks with flat tops can only perform centralizing action but cannot stop rotating, and a graver can easily carve a spiral curve or a left-right swinging line on the surface of a core and cannot carve a straight line in the prior art.

The utility model does not need to be provided with a valve steel ball before drilling. And after the drilling well is drilled to the well bottom, a pump is started to circulate the slurry, and at the moment, the slurry enters the inner cylinder through the positioning joint, the bearing seat, the suspension joint and the inner hole of the suspension assembly and then returns to the annular space from the inner core barrel. Thus, the bottom hole can be cleaned, and the inner core barrel can be washed. And after the mud is well treated and the well bottom is cleaned, putting a valve steel ball into the well, enabling the valve steel ball to fall into the ball seat, blocking the mud passage of the inner core barrel, and starting coring drilling.

During core drilling, a nicking tool on a core claw continuously scores on the core before the original state of the core is not changed, a marking groove is left, and an electronic multi-point measuring instrument is used for measuring the nicking azimuth angle, the well inclination angle and the well inclination azimuth angle of a main tool while drilling.

And after the coring drilling is finished, the drilling tool is slid and pressurized, the weight of the drilling tool is transmitted to the pressurizing device through the valve steel ball, and the pressurizing device transmits the pressure to the pressure bearing seat. The pressure bearing seat transmits the pressure to the pin, when the pressure born by the pin exceeds the shearing strength, the pin is cut off, the pressure bearing seat falls down, the radial through hole of the pressure bearing seat is opposite to the radial through hole of the suspension joint, the 30 steel balls roll out from the ball sleeve and fall into a cavity formed by the suspension assembly and the valve steel balls through the radial through hole of the pressure bearing seat, the suspension assembly, the pressure bearing seat and the inner core barrel are hammered down, the core claw is forced to shrink along the conical surface of the inner cavity of the coring bit, the core is cut off and wrapped, and the purpose of coring is achieved.

After the core is taken out, on the basis of obtaining the azimuth angle and the inclination angle of the core well and the azimuth angles of the directional nick and the directional nick of the core, the core with the directional nick is restored to the original state of the core in the well on an instrument, and then the bedding surface on the core column is measured, so that the rock stratum attitude parameter is obtained.

The utility model adopts a ball-throwing pressurizing core-cutting mechanism with a telescopic function, is particularly suitable for core-cutting operation of soft strata, and can ensure the core harvesting rate. The inner core barrel is hung by a pin, the cutting core is mechanically pressurized, safety and reliability are realized, and the display of the cutting core can be observed on the ground. The suspension assembly adopts large marbles and suspension bearings without the marble clips, allows slurry to pass through, has the cooling and lubricating effects, and has the advantages of simple structure, flexible rotation and long service life. The core claw for cutting the core is reversely buckled and connected with the inner cylinder, so that the core claw is prevented from being reversely buckled in the drilling process. The outer core barrel is made of a high-strength thick-wall seamless steel pipe and is provided with an upper centralizer and a lower centralizer, so that the strength is high, the stability is good, the core harvesting rate is improved, and the service life of a core drill bit is prolonged. The inner rock core barrel can be provided with a glass fiber reinforced plastic inner barrel which has the advantages of light weight, temperature resistance, corrosion resistance, high strength, smooth pipe wall and the like besides the steel inner barrel, and the rock core of the glass fiber reinforced plastic inner barrel has small barrel feeding resistance. The glass fiber reinforced plastic inner cylinder filled with the core can be cut into a plurality of sections, and the two ends of the glass fiber reinforced plastic inner cylinder are sealed, so that the glass fiber reinforced plastic inner cylinder is convenient to store. The length of the well entry combination can be selected according to the underground condition. The internal structure can realize internal washing, and after the well is drilled to the bottom, a pump is started to circularly wash the well bottom and the inner cylinder, and then the ball is thrown to core. The core claw adopts a main and auxiliary graver form, is a triangular hard alloy cutter strip, and solves the problems that two centralizing blocks with flat tops can only perform centralizing action but cannot stop rotating, and a graver can easily carve a spiral curve or a left-right swinging line on the surface of a core and cannot carve a straight line in the prior art.

According to the utility model, three spring gravers are arranged in the pressing sleeve, the spring gravers protrude out of the inner wall of the pressing sleeve, and when the core enters the pressing sleeve, the surface nick of the core is directionally marked. Therefore, the connecting mode that only longitudinal displacement is carried out and torsion direction change is avoided is realized from the accommodating tube of the measuring instrument to the nicking tool on the pressing sleeve on the same bus. The spring graver comprises a graver and a spring piece. The nicking tool is welded at one end of the spring piece, and a rivet hole is formed at the other end of the spring piece. The spring nicking tool is connected with the pressing sleeve through a rivet. The spring piece and the graver form a cantilever beam structure, the telescopic spring graver is adopted as the directional marking device, the positive stress applied by the spring piece to the graver is far greater than the compression-resistant hardness of the rock, and the spring piece can play a role in automatically adjusting the position of the graver and applying the positive stress to the rock when the diameter of the rock core changes due to the hardness of the rock and the freshness and the old of a drill bit. Thus, a clear orientation mark indentation can be obtained under different lithology conditions.

The utility model installs a first thrust bearing and a second thrust bearing on a suspension shaft. The bearing box, the cushion block, the suspension shaft, the first thrust bearing and the second thrust bearing are combined together through self geometric shapes. The structure is beneficial to reducing and reducing the rotation of the coring inner barrel and increasing the stability of the core entering the barrel.

The utility model installs a roller centralizing bearing between a water diversion joint and an upper outer cylinder centralizer, installs a lower roller centralizing bearing between a core claw and a coring bit, and leads the core inner cylinder to be vertically centralized by matching the upper roller centralizing bearing with the lower roller centralizing bearing. The rotation of the core inner barrel is reduced, and the stability of the core entering the barrel is improved.

Drawings

FIG. 1 is a schematic view of a directional coring tool of the present patent.

Fig. 2 is a schematic structural diagram of a first technical scheme of a suspension assembly.

Fig. 3-1 is a schematic structural diagram of a first technical scheme of the directional nicking tool.

FIG. 3-2 is a schematic view of the cross-sectional structure A-A in FIG. 3-1.

Fig. 4 is a schematic structural view of a directional coring tool after a ball is shot.

Fig. 5 is a schematic structural view of a spring nicking tool.

Fig. 6 is a schematic structural diagram of a second technical scheme of the directional nicking tool.

Fig. 7 is a structural schematic diagram of a second technical scheme of the suspension assembly.

FIG. 8 is a schematic structural diagram of a second embodiment of a directional coring tool of the present patent.

In the figure: 1. the device comprises a positioning joint, 2 bearing seats, 3 ball sleeves, 4 first steel balls, 5 suspension joints, 6 suspension assemblies, 6-1 bearing boxes, 6-2 suspension shafts, 6-3 second steel balls, 6-4 bearing rings, 6-5 bearing supports, 6-6 water distribution joints, 6-7 ball seats, 7 upper outer cylinder centralizers, 8 outer core cylinders, 9 inner core cylinders, 10 lower outer cylinder centralizers, 11 pressing sleeves, 12 adjusting rings, 13 core claws, 13-1 left centering nicking tools, 13-2 right centering nicking tools, 13-3 main nicking tools, 14 coring bits, 15 electronic multi-point measuring instruments, 16 spring nicking tools, 16-1 cutter teeth, 16-2 spring leaves, 17 rivets, 18-1 cushion blocks, a bearing block, 6-1 bearing blocks, 6-2 bearing seats, 6-2 bearing shafts, 6-3 bearing rings, 6-4 bearing rings, 6-5 bearing supports, 6-6 water distribution joints, 6-7 ball seats, 7 outer cylinder centralizing tools, 13-2 outer cylinder centralizers, 13-3 right centering nicking tools, 13-3 centering tools, 15 electronic multi-point measuring instruments, 16 spring leaves, 1 spring leaves, and a spring leaf, 18-3, 18-4, 19-1, upper roller centering bearing and 19-2, lower roller centering bearing.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

The first embodiment is as follows:

referring to the attached drawings 1, 2, 3-1 and 3-2, the directional coring tool comprises a positioning joint 1, a pressure bearing seat 2, a ball sleeve 3, a first steel ball 4, a suspension joint 5, a suspension assembly 6, an upper outer cylinder centralizer 7, an outer core barrel 8, an inner core barrel 9, a lower outer cylinder centralizer 10, a pressing sleeve 11, an adjusting ring 12, a core claw 13 and a coring bit 14.

The positioning joint, the upper outer cylinder centralizer, the lower outer cylinder centralizer and the coring bit are sequentially in threaded connection.

The suspension assembly 6 comprises a bearing box 6-1, a suspension shaft 6-2, a second steel ball 6-3, a bearing ring 6-4, a bearing support 6-5, a water distribution joint 6-6 and a ball seat 6-7. The suspension joint 5 is connected with the bearing box 6-1, the bearing box 6-1 is connected with the bearing support 6-5 through a threaded buckle, the suspension shaft 6-2 is connected with the water distribution joint 6-6 through a threaded buckle, and the water distribution joint 6-6 is connected with the ball seat 6-7 through a threaded buckle. The bearing box 6-1, the bearing ring 6-4, the bearing support 6-5, the second steel ball 6-3 and the suspension shaft 6-2 are matched together through the geometrical shapes of the bearing box, and the tool is pressed tightly by gravity when in use.

The positioning connector 1 is connected with an upper outer cylinder centralizer 7 through a threaded buckle, the upper outer cylinder centralizer 7 is connected with an outer core barrel 8 through a threaded buckle, the outer core barrel 8 is connected with a lower outer cylinder centralizer 9 through a threaded buckle, and a lower outer cylinder centralizer 10 is connected with a coring drill bit 14 through a threaded buckle. The suspension joint 5 is connected with the suspension assembly 6 through a threaded buckle, the suspension assembly 6 is connected with the inner core barrel 9 through a threaded buckle, the inner core barrel 9 is connected with the pressing sleeve 11 through a threaded buckle, and the pressing sleeve 11 is connected with the core claw 13 through a threaded buckle. The adjusting ring 12 is positioned between the pressing sleeve 11 and the core claw 13 and limits axial movement by means of extrusion of the pressing sleeve 11 and the core claw 13. The pressure bearing seat 2 is connected with the positioning joint 1 through a pin. The ball sleeve 3 is connected with the positioning joint 1 through a thread buckle. The first steel ball 4 is positioned in the ball sleeve 3, and the positioning joint 1 is opposite to two radial through holes of the suspension joint 5 and is connected with the suspension joint through the first steel ball 4. The electronic multi-point inclinometer 15 is arranged in the non-magnetic drill collar at the upper end of the coring tool and is connected with the suspension shaft 6-2 at the upper end of the inner core barrel 9 into a whole, so that the relative displacement is not generated.

And three directional nicking tools are welded at the lower end of the core claw 13 in an inlaying mode, and each directional nicking tool comprises a left centering nicking tool 13-1, a right centering nicking tool 13-2 and a main nicking tool 13-3.

Example two:

referring to fig. 4, the valve steel balls 6-8 are not installed before drilling. And after the drilling is carried out to the bottom of the well, a pump is started to circulate the slurry, and at the moment, the slurry enters the inner core barrel 9 through the positioning joint 1, the bearing seat 2, the suspension joint 5 and the inner hole of the suspension assembly 6 and then returns to the annular space from the inner core barrel 9. This allows both the bottom hole and the inner core barrel 9 to be cleaned. After the mud is well treated and the well bottom is cleaned, the valve steel balls 6-8 are put in, the valve steel balls 6-8 fall into the ball seats 6-7, the mud passage of the inner core barrel 9 is blocked, and core drilling is started.

During core drilling, a nicking tool on a core claw 13 continuously scores on the core before the original state of the core is not changed, a marking groove is left, and an electronic multipoint measuring instrument 15 is used for measuring the azimuth angle of a main cutting score 13-3 trace, the inclination angle of a well and the azimuth angle of a well deviation while drilling. The left centering nicking tool 13-1 and the right centering nicking tool 13-2 play roles of rotation stopping and centering, and the phenomenon that the main nicking tool 13-3 is easy to carve a spiral curve or a left-right swinging line on the surface of the rock core and cannot carve a straight line is avoided.

And after the coring drilling is finished, the drilling tool is slid and pressurized, the weight of the drilling tool is transmitted to the pressurizing device through the valve steel balls 6-8, and the pressurizing device transmits the pressure to the pressure bearing seat 2. The pressure bearing seat 2 transmits the pressure to the pin, when the pressure born by the pin exceeds the shearing strength, the pin is sheared, the pressure bearing seat 2 falls, the radial through hole of the pressure bearing seat 2 is opposite to the radial through hole of the suspension joint 5, the first steel ball 4 rolls out of the ball sleeve 3 and falls into a cavity formed by the suspension assembly 6 and the valve steel ball 6-8 through the radial through hole of the pressure bearing seat 2, the suspension assembly 6, the pressure bearing seat 2 and the inner core barrel 9 are knocked down, the core claw 13 is forced to shrink along the conical surface of the inner cavity of the coring bit 14, and the core is cut off and wrapped, so that the purpose of coring is achieved.

Example three:

referring to fig. 5 and 6, another technical solution of the present invention for the directional nicking tool is to install three spring nicking tools 16 in the pressing sleeve 11, wherein the spring nicking tools 16 protrude from the inner wall of the pressing sleeve 11, and when the core enters the pressing sleeve 11, the directional marking is performed on the surface of the core. Thus, the connection is realized with only longitudinal displacement and no change in the orientation of the torsion, from the meter accommodating tube until the spring nicking tool 16 on the pressure sleeve 11 is on the same bus. The spring graver 16 comprises cutter teeth 16-1 and a spring piece 16-2. The cutter teeth 16-1 are welded at one end of the spring piece 16-2, and a rivet hole is formed at the other end of the spring piece 16-2. The spring nicking tool 16 is connected with the pressing sleeve 11 through a rivet. The spring piece 16-2 and the cutter teeth 16-1 form a cantilever beam structure, the telescopic spring graver 16 is adopted as the directional marking device, the positive stress applied by the spring piece 16-2 to the cutter teeth 16-1 is far larger than the compression-resistant hardness of rock, and when the diameter of a rock core changes due to the hardness of the rock and the freshness of a drill bit, the spring piece 16-2 can automatically adjust the position of the cutter teeth 16-1 and apply the positive stress to the rock. Thus, a clear orientation mark indentation can be obtained under different lithology conditions.

Example five:

referring to fig. 7, a second solution of the present patent to the suspension assembly is to mount a first thrust bearing 18-3 and a second thrust bearing 18-4 on the suspension shaft 6-2. The bearing box 6-1, the cushion block 18-1, the suspension shaft 6-2, the first thrust bearing 18-3 and the second thrust bearing 18-4 are combined together through self geometric shapes. The structure is beneficial to reducing and reducing the rotation of the coring inner barrel and increasing the stability of the core entering the barrel.

Example six:

referring to fig. 8, the second technical scheme of the directional coring tool in the patent is to keep the parts and the connection mode of the parts in the first technical scheme unchanged, install an upper roller centering bearing 19-1 between a water diversion joint 6-6 and an upper outer cylinder centralizer 7, install a lower roller centering bearing 19-2 between a core claw 13 and a coring bit 14, and match the upper roller centering bearing 19-1 with the lower roller centering bearing 19-2 to vertically center an inner core barrel 9. The rotation of the core inner barrel is reduced, and the stability of the core entering the barrel is improved.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (12)

1. A directional coring tool comprises a tool main body consisting of a positioning joint (1), an upper outer cylinder centralizer (7), an outer core barrel (8), a lower outer cylinder centralizer (10) and a coring bit (14) which are sequentially connected by threads;

the tool body is internally provided with a bearing seat (2), a suspension joint (5), a suspension assembly (6), an inner core barrel (9), a pressing sleeve (11) and a core claw (13) from top to bottom in sequence; the pressure bearing seat (2) is sleeved in the positioning joint (1) through a shearing pin;

the novel bearing seat is characterized in that the upper end of the suspension joint (5) is sleeved between the lower ends of the positioning joint (1) and the bearing seat (2), the upper end of the positioning joint (1), the lower end of the suspension joint (5) and the lower end of the bearing seat (2) are in clearance fit, radial through holes are formed in the upper end of the positioning joint (1), the lower end of the suspension joint (5) and the lower end of the bearing seat (2), the diameter of each radial through hole is larger than that of a first steel ball (4), a ball sleeve (3) is in threaded connection with the outer end of each radial through hole of the positioning joint (1), the positions of the radial through holes in the upper ends of the positioning joint (1) and the suspension joint (5) correspond to each other, the radial through holes in the lower end of the bearing seat (2) are higher than the radial through holes in the upper end of the suspension joint (5), and the first steel ball (4) is arranged between the radial through holes in the upper ends of the positioning joint (1) and the suspension joint (5), so that the positioning joint (1) is positioned, The suspension joint (5) is axially fixed;

the suspension assembly (6) is rotatably sleeved at the lower end of the suspension joint (5) through a bearing assembly;

the lower end of the positioning connector (1) is connected with the upper end of an upper outer cylinder centralizer (7) through a threaded buckle, the lower end of the upper outer cylinder centralizer (7) is connected with the upper end of an outer core cylinder (8) through a threaded buckle, the lower end of the outer core cylinder (8) is connected with the upper end of a lower outer cylinder centralizer (10) through a threaded buckle, and the lower end of the lower outer cylinder centralizer (10) is connected with the upper end of a coring drill bit (14) through a threaded buckle;

the lower end of the water distribution joint (6-6) is in threaded connection with the inner core barrel (9) through external threads, the lower end of the inner core barrel (9) is in threaded buckle connection with the upper end of the pressing sleeve (11), and the lower end of the pressing sleeve (11) is in threaded buckle connection with the upper end of the core claw (13);

the lower end of the pressing sleeve (11) and the upper end of the core claw (13) are provided with limiting steps, the adjusting ring (12) is positioned between the limiting steps, and the axial movement is limited by means of extrusion of the pressing sleeve (11) and the core claw (13).

2. A directional coring tool according to claim 1, wherein the suspension assembly (6) comprises a bearing assembly, a suspension shaft (6-2), a water diversion joint (6-6), a ball seat (6-7);

the bearing assembly comprises a bearing box (6-1), a bearing support (6-5) and a second steel ball (6-3);

the lower end of the suspension joint (5) is in threaded connection with the upper end of the bearing box (6-1), and the internal thread at the lower end of the bearing box (6-1) is connected with the external thread at the upper end of the bearing support (6-5); the external thread at the lower end of the suspension shaft (6-2) is connected with the internal thread at the upper end of the water distribution joint (6-6), and the internal thread at the lower end of the water distribution joint (6-6) is connected with the external thread at the upper end of the ball seat (6-7); the suspension shaft (6-2) is rotatably sleeved in the bearing box (6-1) through a bearing assembly;

the inner wall of the lower end of the bearing box (6-1) and the outer wall of the suspension shaft (6-2) are provided with limiting steps, the limiting steps respectively form two opposite annular grooves with the upper end face of the bearing support (6-5) and the upper end face of the water distribution joint (6-6), the bearing ring (6-4) is sleeved in the annular grooves, and the second steel ball (6-3) is embedded in the bearing ring (6-4).

3. A directional coring tool according to claim 1, wherein the suspension assembly (6) comprises a bearing assembly, a suspension shaft (6-2), a water diversion joint (6-6), a ball seat (6-7);

the bearing assembly comprises a bearing box (6-1), a first thrust bearing (18-3) and a bearing support (6-5);

the lower end of the suspension joint (5) is in threaded connection with the upper end of the bearing box (6-1), and the internal thread at the lower end of the bearing box (6-1) is connected with the external thread at the upper end of the bearing support (6-5); the external thread at the lower end of the suspension shaft (6-2) is connected with the internal thread at the upper end of the water distribution joint (6-6), and the internal thread at the lower end of the water distribution joint (6-6) is connected with the external thread at the upper end of the ball seat (6-7); the suspension shaft (6-2) is rotatably sleeved in the bearing box (6-1) through a bearing assembly;

the inner wall of the lower end of the bearing box (6-1) and the outer wall of the suspension shaft (6-2) are provided with limiting steps, the limiting steps respectively form two opposite annular grooves with the upper end face of the bearing support (6-5) and the upper end face of the water distribution joint (6-6), and the first thrust bearing (18-3) is sleeved in the annular grooves.

4. A directional coring tool according to claim 3, wherein the bearing assembly further comprises a second thrust bearing (18-4), the number of the limiting steps on the outer wall of the suspension shaft (6-2) is two, one of the limiting steps divides the annular groove on the outer wall of the suspension shaft (6-2) into an upper annular groove and a lower annular groove, and the second thrust bearing (18-4) is arranged in the annular groove below.

5. A directional coring tool according to any one of claims 2-3, further comprising an upper roller centering bearing (19-1) and a lower roller centering bearing (19-2), wherein the upper outer cylinder centralizer (7) is externally provided with a limit step at the upper end to form a ring groove with the lower end surface of the water diversion connector (6-6); a limiting step is arranged outside the coring bit (14) to form an annular groove with the outer wall of the core claw (13); the upper roller centralizing bearing (19-1) and the lower roller centralizing bearing (19-2) are respectively arranged in the ring grooves.

6. An oriented coring tool as set forth in claim 1 wherein the inner wall of the lower end of the core claw (13) is welded with a core orientation nicking tool.

7. An oriented coring tool as claimed in claim 6 wherein the core orientation nicking tool comprises a left centering nicking tool (13-1), a right centering nicking tool (13-2) and a main nicking tool (13-3) which are arranged in a circumferentially unequal manner.

8. An oriented coring tool as set forth in claim 7, wherein the core orientation nicking tool is a three-edged cemented carbide blade.

9. A directional coring tool according to claim 1, wherein the upper end of the bearing seat (2) is provided with a limiting step having an outer diameter larger than the inner diameter of the suspension joint (5), when the shear pin is sheared and the bearing seat (2) falls down, the limiting step at the upper end of the bearing seat (2) is clamped at the upper end of the suspension joint (5), and the radial through hole on the bearing seat (2) is opposite to the radial through hole on the suspension joint (5).

10. The directional coring tool according to claim 1, wherein during coring, the shearing pin is sheared, the bearing seat (2) falls, a radial through hole of the bearing seat (2) is opposite to a radial through hole of the suspension joint (5), the first steel ball (4) rolls out of the ball sleeve (3), the suspension assembly (6), the bearing seat (2) and the inner core barrel (9) are hammered downwards, and the core claw (13) is forced to shrink along the conical surface of the inner cavity of the coring bit (14) to cut off and wrap the core, so that the purpose of coring is achieved.

11. A directional coring tool according to any one of claims 1-4 or 6-10, wherein three spring nickers (16) are installed in the pressing sleeve (11), the spring nickers (16) protrude out of the inner wall of the pressing sleeve (11), and the spring nickers (16) comprise cutter teeth (16-1) and spring pieces (16-2); the cutter teeth (16-1) are welded at one end of the spring piece (16-2), and a rivet hole is formed at the other end of the spring piece (16-2); the spring nicking tool (16) is connected with the pressing sleeve (11) through a rivet.

12. A directional coring tool according to claim 11, wherein the cutter teeth (16-1) are cemented carbide using a working material.

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