CN213627502U - Prevent stifled anti-overflow drilling mud tubular column - Google Patents

Abstract

The utility model relates to a prevent stifled anti-overflow bores grey tubular column, include the milling shoes by screw rod drilling tool driven, the upper end of screw rod drilling tool has connect the bypass valve soon, the upper end of bypass valve has connect the sand setting device soon, the upper joint inner chamber lower part of sand setting device is equipped with unloads the ball cover, the inner chamber of sand setting barrel is equipped with sand setting core pipe, the lower extreme of sand setting core pipe connects in the lower clutch soon, the upper end of sand setting core pipe has connect the check valve body soon, the inner chamber upper portion of check valve body is pegged graft with the check valve core, the lower part of check valve core is equipped with the case frustum, stretch out in the upper end reducing hole of the upper portion check valve body of check valve core, and the periphery symmetry of check valve core is equipped with multichannel overflow groove, the upper end of check valve core has connect the taper cap; the inner cavity of the one-way valve body is provided with a one-way valve spring which is supported between the upper port of the sand setting core pipe and the bottom of the valve core frustum. The anti-blocking and anti-overflow drilling mud pipe column can prevent mud and sand from entering the screw drilling tool, and the screw drilling tool can be smoothly started when the well washing liquid is recovered.

Description

Prevent stifled anti-overflow drilling mud tubular column

Technical Field

The utility model relates to a screw rod drilling tool, in particular to prevent stifled anti-overflow drilling mud tubular column belongs to drilling tool technical field.

Background

Petroleum and natural gas are exploited through a shaft formed by drilling construction, and a shaft casing string in the shaft is formed by sequentially screwing casings one by one through threads. The operation of injecting cement into the annular space between the wellbore and the casing is known as cementing. Along with the increase of the exploitation time of oil and gas wells, the underground environment is more severe, the casing is easy to damage, and leakage is generated between the stratum and the inner cavity of the casing.

There are various ways of workover operations after casing damage, such as suspending a small casing in the original casing, re-cementing, etc. For the well with less serious casing damage, the leakage section in the original casing is injected with cement slurry and extruded to enter the leakage point to realize leakage stoppage, so that the leakage stoppage is most economical and the operation time is shortest. After the cement paste is successfully plugged, the cement paste in the casing needs to be milled and drilled to recover the inner cavity channel of the casing. The drilling and dust-removing operation is usually performed by a milling shoe which is connected below a screw drill, the screw drill drives the milling shoe to rotate under the drive of a well-washing liquid, the screw drill is connected at the lower end of an oil pipe, and the well-washing liquid is driven to circulate by a cement truck. Along with the continuous deepening of the drilling dust depth, oil pipes need to be continuously added and connected, the cement car needs to be stopped when the oil pipes are added and connected every time, the circulation of the well washing liquid is stopped, sand easily settles in a flow passage of the screw drilling tool to cause blockage, and therefore a sand settling device needs to be installed on the screw drilling tool to prevent the mud sand above from entering the screw drilling tool during the pump stopping process.

In addition, after the milling sleeve pipe is finished, when the pipe column is pulled up, the well head is polluted due to the fact that the flushing liquid in the pipe column is taken out of the ground, the well head environment is worsened, and the environment protection requirement is not met.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the problem that exists among the prior art, provide a prevent stifled anti-overflow and bore grey tubular column, during cement truck stops, can self-closing central pore, avoid the silt particle of top to get into the screw rod drilling tool, when the well-flushing liquid resumes the circulation, can open central pore automatically, make the screw rod drilling tool start smoothly.

In order to solve the technical problem, the utility model discloses an anti-blocking anti-overflow bores grey tubular column, including the mill shoe, the upper end of mill shoe has screwed connection the screw rod drilling tool that drives its rotation, the upper end of screw rod drilling tool has screwed connection the bypass valve, the upper end of bypass valve has screwed connection the sand setting device between oil pipe, the sand setting device includes the sand setting barrel, the upper end of sand setting barrel has screwed connection the top connection, the lower extreme of sand setting barrel has screwed connection the bottom connection, the inner chamber lower part of top connection is equipped with unloads the ball cover, the lower extreme that unloads the ball cover stretches out the lower port of top connection; the inner cavity of the sand setting cylinder body is provided with a sand setting core pipe coaxial with the sand setting cylinder body, the lower end of the sand setting core pipe is screwed in an inner screw hole of the lower connector, the upper end of the sand setting core pipe is screwed with a cylindrical one-way valve body, the upper part of the inner cavity of the one-way valve body is spliced with a one-way valve core, the lower part of the one-way valve core is provided with an enlarged valve core frustum, the upper part of the one-way valve core is cylindrical and extends upwards from a reducing hole at the upper end of the one-way valve body, the periphery of the one-way valve core is symmetrically provided with a plurality of flow passing grooves extending along the axial direction, the upper end of the one-way valve core is screwed with a conical cap with an umbrella-; the inner cavity of the one-way valve body is provided with a one-way valve spring, the lower end of the one-way valve spring is supported at the upper port of the sand setting core pipe, and the upper end of the one-way valve spring is abutted against the bottom of the valve core frustum.

Compared with the prior art, the utility model discloses following beneficial effect has been obtained: before the cement truck is started, the one-way valve core is ejected upwards under the tension of the one-way valve spring, the lower port of the ball unloading sleeve is sealed by the conical cap, and the one-way valve is in a closed state. After the cement truck is started, the flushing fluid with certain pressure flows downwards from the upper joint along the central hole of the ball discharging sleeve, the tension of a one-way valve spring is overcome, the cone cap and the one-way valve core are pushed to move downwards, a one-way valve channel is opened, the flushing fluid flows towards the inner wall of the sand setting barrel firstly under the shunting action of the cone cap, a small amount of sand carried by the flushing fluid is settled in an annular space between the sand setting barrel and a sand setting core pipe, the clean flushing fluid enters an inner cavity of the one-way valve body through an overflowing groove on the periphery of the one-way valve core, flows downwards along the central holes of the sand setting core pipe and the lower joint, passes through the central hole of the bypass valve and enters a screw drilling tool, and the screw drilling tool drives the milling shoe to. When the oil pipe is added and connected, the cement truck stops, and the lower port of the ball unloading sleeve is re-closed by the conical cap, so that settled sand above the conical cap is prevented from entering the screw drilling tool. After the operation is finished, the cement truck is closed, the one-way valve is closed, the well-flushing liquid is stored in the pipe column, and if the pipe column is lifted, the well-flushing liquid is carried out of the ground to pollute a well site; at the moment, a steel ball is thrown into the pipe column, the cement truck is started to be pressurized, the steel ball penetrates through a center hole of the ball unloading sleeve, the conical cap is pressed down and rolls down between the conical cap and the lower end face of the upper joint, a channel of the one-way valve is opened, and when the pipe column is lifted, well washing liquid flows into the casing pipe to keep a well mouth clean and environment-friendly.

As the improvement of the utility model, the lower part of the upper reducing hole of the one-way valve body is provided with an inner conical surface matched with the valve core frustum. After the valve core frustum at the lower part of the one-way valve core is attached to the inner conical surface at the upper part of the one-way valve body, a good positioning effect can be achieved, the one-way valve core, the one-way valve body and the ball unloading sleeve are ensured to be coaxial, and the inner cavity space of the one-way valve body can be sealed.

As a further improvement, the bottom of the valve core frustum is provided with an outer step of the frustum, and the upper end of the check valve spring is sleeved on the outer step of the frustum. The outer step of the frustum enables the upper end of the one-way valve spring to be well positioned, and deflection in the compression or extension process is prevented.

As a further improvement of the utility model, the upper end of the ball discharging sleeve is provided with a boss on the ball discharging sleeve with a large diameter, the top of the boss on the ball discharging sleeve is symmetrically provided with a downward extending discharging hole, and the two sides of the lower end of the ball discharging sleeve are symmetrically provided with a tenon of the ball discharging sleeve protruding outwards; the upper part of the inner cavity of the upper joint is an upper joint inner thread section, a reduced upper joint first unthreaded hole section is arranged below the upper joint inner thread section, a reduced upper joint second unthreaded hole section is arranged below the upper joint first unthreaded hole section, a pair of through upper joint long grooves are symmetrically arranged on the inner wall of the upper joint second unthreaded hole section, another pair of upper joint short grooves are also symmetrically arranged on the inner wall of the upper joint second unthreaded hole section, the upper joint short grooves are sunken grooves extending upwards from the bottom of the upper joint, and the upper joint long grooves and the upper joint short grooves are distributed in a cross shape and have the same groove width; the ball discharging sleeve boss is positioned in the inner cavity of the first unthreaded hole section of the upper joint, and the ball discharging sleeve tenon is correspondingly embedded in the upper joint short groove; the ball discharging sleeve is characterized in that a ball discharging sleeve spring is sleeved on the periphery of the ball discharging sleeve, the upper end of the ball discharging sleeve spring abuts against the lower portion of a boss on the ball discharging sleeve, and the lower end of the ball discharging sleeve spring abuts against an inner step at the bottom of the first unthreaded hole section of the upper connector. The boss on the ball discharging sleeve can float in the second unthreaded hole section of the upper joint, the tenon of the ball discharging sleeve at the lower end of the ball discharging sleeve is correspondingly embedded into the short slot of the upper joint at the bottom of the upper joint, so that the ball discharging sleeve cannot rotate, and the tension of the spring of the ball discharging sleeve lifts the ball discharging sleeve upwards, so that the tenon of the ball discharging sleeve cannot be separated from the short slot of the upper joint. After the operation is finished and the ball is thrown, the steel ball is clamped between the conical cap and the lower end face of the upper joint, so that the one-way valve is kept in an open state and loses the function; inserting a deflector rod into a dismounting hole of a boss on the ball discharging sleeve, pressing the boss on the ball discharging sleeve downwards to enable a tenon of the ball discharging sleeve to be separated from a short groove of an upper joint downwards, rotating the ball discharging sleeve by 90 degrees through the deflector rod to enable the tenon of the ball discharging sleeve to be aligned with a long groove of the upper joint, releasing the pressing pressure, enabling a spring of the ball discharging sleeve to jack the boss on the ball discharging sleeve upwards, enabling the tenon of the ball discharging sleeve to slide upwards along the long groove of the upper joint, taking out a steel ball after the ball discharging sleeve is dismounted, sleeving the spring of the ball discharging sleeve into the tenon of the ball discharging sleeve to enable the tenon of the ball discharging sleeve to be aligned with the long groove of the upper joint to be pressed downwards, rotating by 90 degrees when the tenon of the ball discharging sleeve exceeds the bottom of the upper joint, enabling the tenon of the ball discharging sleeve to be re-embedded into the.

As a further improvement of the present invention, the bypass valve includes a bypass valve body, a plurality of valve body bypass holes communicated with the inner cavity are uniformly distributed on the circumference of the bypass valve body, the inner cavity of the bypass valve body is provided with a bypass valve sleeve and a bypass valve core, the lower end of the bypass valve sleeve is fixed at the lower part of the bypass valve body center hole through a hole check ring, the top of the bypass valve sleeve is lower than the lower edge of the valve body bypass hole, and the periphery of the bypass valve sleeve is sealed with the center hole of the bypass valve body through an outer valve sleeve sealing ring; the periphery of the upper part of the bypass valve core is abutted against the lower part of an inner step of a bypass valve body and is sealed with a central hole of the bypass valve body through a bypass valve core O-shaped ring, the lower part of the bypass valve core is provided with a bypass valve core small-diameter section, a plurality of valve core radial holes are uniformly distributed on the circumference of the bypass valve core small-diameter section, the lower end of the bypass valve core small-diameter section is inserted in the central hole of the bypass valve sleeve and is sealed through a valve sleeve inner sealing ring; the bypass valve is characterized in that a bypass valve spring is sleeved on the periphery of the small-diameter section of the bypass valve core, the lower end of the bypass valve spring is supported at the upper port of the bypass valve sleeve, and the upper end of the bypass valve spring abuts against the lower part of the upper outer step of the bypass valve core. After the cement truck is started, as the diameter of the central hole of the bypass valve core is far smaller than that of the oil pipe, the flushing fluid passes through the central hole of the bypass valve core and pushes the bypass valve core to move downwards, so that the radial hole of the valve core enters the bypass valve sleeve, the bypass valve is closed, and the flushing fluid enters the screw drilling tool downwards. When an oil pipe is added and connected, the cement truck is closed, the bypass valve core moves upwards to reset under the tension action of the bypass valve spring, so that the radial hole of the valve core and the bypass hole of the valve body automatically recover a through state, and the pressure of the inner cavity of the pipe column is relieved.

As a further improvement, the screw drill top-down is equipped with hydraulic motor, universal joint and transmission shaft in proper order, hydraulic motor's lower extreme passes through universal joint drive transmission shaft and rotates, the upper end of milling shoes connects soon the lower extreme of transmission shaft. The high-pressure well washing liquid drives the hydraulic motor to work, the hydraulic motor drives the transmission shaft to rotate through the universal joint, and the transmission shaft drives the milling shoes to rotate so as to carry out milling operation.

Drawings

The invention will be described in further detail with reference to the drawings and the detailed description, which are provided for reference and illustration purposes only and are not intended to limit the invention.

Fig. 1 is the structure schematic diagram of the anti-blocking anti-overflow drilling ash pipe column of the utility model.

Fig. 2 is a front view of the sand settling device of the present invention.

Fig. 3 is a state diagram of the middle sand-settling device after ball-throwing.

Fig. 4 is a three-dimensional explosion diagram of the sand settling device of the present invention.

Fig. 5 is a perspective view of an upper joint in the sand setting device.

Fig. 6 is a sectional view of an upper joint in the sand setting device.

Fig. 7 is a perspective view of a ball discharging sleeve in the sand setting device.

Fig. 8 is a perspective view of a one-way valve core in the sand setting device.

Fig. 9 is a schematic structural view of a portion below the bypass valve according to the present invention.

FIG. 10 is an enlarged view of the bypass valve of FIG. 9.

In the figure: A. a sand setting device; B. a bypass valve; C. a screw drill; D. grinding and milling the shoe; 1. an upper joint; 1a, an upper joint internal thread section; 1b, connecting a first unthreaded hole section; 1c, connecting a second unthreaded hole section; 1d, an upper joint long groove; 1e, an upper joint short groove; 2. a sand setting cylinder body; 3. a lower joint; 4. unloading the ball sleeve; 4a, sleeving a boss on the ball discharging sleeve; 4b, disassembling the tenon of the ball sleeve; 4c, disassembling the hole; 4d, unloading the ball sleeve spring; 5. a conical cap; 6. a one-way valve core; 6a, a flow groove; 6b, a valve core frustum; 6c, an outer step of the frustum; 7. a check valve spring; 8. a check valve body; 9. setting a sand core pipe; 10. and (5) steel balls. 11. A bypass valve body; 11a, a valve body bypass hole; 12. a bypass spool; 12a, a small-diameter section of the bypass valve core; 12b, valve core radial holes; 12c, a bypass valve core O-shaped ring; 13. a bypass valve housing; 13a, a valve sleeve outer sealing ring; 13b, a valve sleeve inner sealing ring; 14. a bypass valve spring; 15. a retainer ring for a bore. 16. A hydraulic motor; 17. a universal joint; 18. a drive shaft.

Detailed Description

As shown in fig. 1, the utility model discloses a prevent stifled anti-overflow brill ash tubular column includes milling shoe D, and milling shoe D's upper end has connect soon and has driven its pivoted screw rod drilling tool C, and screw rod drilling tool C's upper end has connect soon bypass valve B, has connect soon sand setting device A between bypass valve B's upper end and the oil pipe.

As shown in fig. 2 to 8, the sand setting device a includes a sand setting cylinder 2, an upper joint 1 is screwed to the upper end of the sand setting cylinder 2, a lower joint 3 is screwed to the lower end of the sand setting cylinder 2, a ball discharging sleeve 4 is arranged at the lower part of the inner cavity of the upper joint 1, and the lower end of the ball discharging sleeve 4 extends out of the lower port of the upper joint 1; the inner cavity of the sand setting cylinder body 2 is provided with a sand setting core pipe 9 coaxial with the sand setting cylinder body, the lower end of the sand setting core pipe 9 is screwed in an inner screw hole of the lower joint 3, the upper end of the sand setting core pipe 9 is screwed with a cylindrical one-way valve body 8, the upper part of the inner cavity of the one-way valve body 8 is spliced with a one-way valve core 6, the lower part of the one-way valve core 6 is provided with an enlarged valve core frustum 6b, the upper part of the one-way valve core 6 is cylindrical and extends upwards from a reducing hole at the upper end of the one-way valve body 8, and the periphery of the one-way valve core 6 is symmetrically provided with a plurality of flow passing grooves 6a extending. The upper end of the one-way valve core 6 is screwed with a conical cap 5 with an umbrella-shaped top, and the conical cap 5 is propped against the lower port of the ball discharging sleeve 4; the inner cavity of the one-way valve body 8 is provided with a one-way valve spring 7, the lower end of the one-way valve spring 7 is supported at the upper port of the sand setting core pipe 9, and the upper end of the one-way valve spring 7 is abutted against the bottom of the valve core frustum 6b.

An inner conical surface matched with the valve core frustum 6b is arranged below the reducing hole at the upper end of the one-way valve body 8. After the valve core frustum 6b at the lower part of the one-way valve core 6 is attached to the inner conical surface at the upper part of the one-way valve body 8, a good positioning effect can be achieved, the one-way valve core 6, the one-way valve body 8 and the ball unloading sleeve 4 are ensured to be coaxial, and the inner cavity space of the one-way valve body 8 can be sealed.

The bottom of the valve core frustum 6b is provided with a frustum outer step 6c, and the upper end of the one-way valve spring 7 is sleeved on the frustum outer step 6c. The frustum outer step 6c enables the upper end of the one-way valve spring 7 to be well positioned, and deflection in the compression or extension process is prevented.

Before the cement truck is started, the one-way valve core 6 is ejected upwards under the tension of the one-way valve spring 7, the lower port of the ball unloading sleeve 4 is sealed by the conical cap 5, and the one-way valve is in a closed state. After the cement truck is started, the well-washing liquid with certain pressure flows downwards from the upper connector 1 along the central hole of the ball-discharging sleeve 4, the tension of a one-way valve spring 7 is overcome, the cone cap 5 and the one-way valve core 6 are pushed to move downwards, a one-way valve channel is opened, under the shunting action of the cone cap 5, the well-washing liquid firstly flows to the inner wall of the sand setting barrel, a small amount of sand carried by the well-washing liquid is settled in an annular space between the sand setting barrel 2 and a sand setting core pipe 9, the clean well-washing liquid enters an inner cavity of the one-way valve body 8 through an overflowing groove 6a on the periphery of the one-way valve core 6, flows downwards along the central holes of the sand setting core pipe 9 and the lower connector 3, passes through the central hole of the bypass valve B and enters the screw drilling tool C, and.

When an oil pipe is added and the cement truck stops, the lower port of the ball unloading sleeve 4 is closed again by the conical cap 5, and settled sand above the ball unloading sleeve is prevented from entering the screw drilling tool C.

After the operation is finished, the cement truck is closed, the one-way valve is closed, the well-flushing liquid is stored in the pipe column, and if the pipe column is lifted, the well-flushing liquid is carried out of the ground to pollute a well site; at the moment, a steel ball 10 is thrown into the pipe column, the cement truck is started to be pressurized, the steel ball 10 penetrates through a center hole of the ball unloading sleeve 4, the conical cap 5 is pressed downwards and falls between the conical cap 5 and the lower end face of the upper connector 1, a channel of the one-way valve is opened, and when the pipe column is lifted, well washing liquid flows into the casing pipe to keep a well mouth clean and environment-friendly.

The upper end of the ball discharging sleeve 4 is provided with a large-diameter ball discharging sleeve upper boss 4a, the top of the ball discharging sleeve upper boss 4a is symmetrically provided with a downward extending dismounting hole 4c, and two sides of the lower end of the ball discharging sleeve 4 are symmetrically provided with a ball discharging sleeve tenon 4b protruding outwards; the upper part of the inner cavity of the upper joint 1 is an upper joint inner thread section 1a, a diameter-reduced upper joint first unthreaded hole section 1b is arranged below the upper joint inner thread section 1a, a diameter-reduced upper joint second unthreaded hole section 1c is arranged below the upper joint first unthreaded hole section 1b, a pair of through upper joint long grooves 1d are symmetrically arranged on the inner wall of the upper joint second unthreaded hole section 1c, another pair of upper joint short grooves 1e are also symmetrically arranged on the inner wall of the upper joint second unthreaded hole section 1c, the upper joint short grooves 1e are sunken grooves extending upwards from the bottom of the upper joint, and the upper joint long grooves 1d and the upper joint short grooves 1e are distributed in a cross shape and have equal groove widths; the boss 4a on the ball discharging sleeve is positioned in the inner cavity of the first unthreaded hole section 1b of the upper joint, and the tenon 4b of the ball discharging sleeve is correspondingly embedded in the short groove 1e of the upper joint.

The periphery of the ball unloading sleeve 4 is sleeved with a ball unloading sleeve spring 4d, the upper end of the ball unloading sleeve spring 4d is abutted against the lower part of the ball unloading sleeve boss 4a, and the lower end of the ball unloading sleeve spring 4d is abutted against the inner step at the bottom of the first unthreaded hole section 1b of the upper connector.

The boss 4a on the ball discharging sleeve can float in the second unthreaded hole section 1c of the upper joint, the tenon 4b of the ball discharging sleeve at the lower end of the ball discharging sleeve 4 is correspondingly embedded into the short slot 1e of the upper joint at the bottom of the upper joint, so that the ball discharging sleeve 4 cannot rotate, and the tension of the spring 4d of the ball discharging sleeve lifts the ball discharging sleeve 4 upwards, so that the tenon 4b of the ball discharging sleeve cannot be separated from the short slot 1e of the upper joint.

After the operation is finished and the ball is thrown, the steel ball 10 is clamped between the conical cap 5 and the lower end face of the upper joint 1, so that the one-way valve is kept in an open state and loses the function; inserting a deflector rod into a dismounting hole 4c of a boss 4a of the ball discharging sleeve, simultaneously pressing the boss 4a of the ball discharging sleeve downwards to enable a tenon 4b of the ball discharging sleeve to be separated from a short groove 1e of an upper joint downwards, then rotating the ball discharging sleeve 4 by 90 degrees through the deflector rod to enable the tenon 4b of the ball discharging sleeve to be aligned with a long groove 1d of the upper joint, releasing the pressing pressure, enabling a spring 4d of the ball discharging sleeve to jack the boss 4a of the ball discharging sleeve upwards, enabling the tenon 4b of the ball discharging sleeve to slide out upwards along the long groove 1d of the upper joint, taking out a steel ball 10 after the ball discharging sleeve 4 is dismounted, then sleeving the spring 4d of the ball discharging sleeve into the spring 4d of the ball discharging sleeve to enable the tenon 4b of the ball discharging sleeve to be aligned with the long groove 1d of the upper joint to be pressed downwards, and enabling the tenon 4b of the ball discharging sleeve to rotate by 90 degrees when the tenon 4b of the ball discharging sleeve exceeds the bottom of the upper joint 1, and enabling the.

As shown in fig. 9 and 10, the bypass valve B includes a bypass valve body 11, a plurality of valve body bypass holes 11a communicated with the inner cavity are uniformly distributed on the circumference of the bypass valve body 11, a bypass valve sleeve 13 and a bypass valve core 12 are arranged in the inner cavity of the bypass valve body 11, the lower end of the bypass valve sleeve 13 is fixed at the lower part of the bypass valve body central hole through a hole retainer ring 15, the top of the bypass valve sleeve 13 is lower than the lower edge of the valve body bypass hole 11a, and the periphery of the bypass valve sleeve 13 is sealed with the central hole of the bypass valve body 11 through a valve sleeve outer seal ring; the periphery of the upper part of the bypass valve core 12 abuts against the lower part of an inner step of the bypass valve body 11, and is sealed with a central hole of the bypass valve body 11 through a bypass valve core O-shaped ring 12c, the lower part of the bypass valve core 12 is provided with a bypass valve core small-diameter section 12a, a plurality of valve core radial holes 12b are uniformly distributed on the circumference of the bypass valve core small-diameter section 12a, the lower end of the bypass valve core small-diameter section 12a is inserted into the central hole of the bypass valve sleeve 13, and sealing is realized through a valve sleeve inner sealing ring 13 b; the periphery of the small diameter section 12a of the bypass valve core is sleeved with a bypass valve spring 14, the lower end of the bypass valve spring 14 is supported at the upper port of the bypass valve sleeve 13, and the upper end of the bypass valve spring 14 abuts against the lower part of the upper outer step of the bypass valve core 12.

After the cement truck is started, as the diameter of the central hole of the bypass valve core 12 is far smaller than that of the oil pipe, the flushing fluid passes through the central hole of the bypass valve core and pushes the bypass valve core 12 to move downwards, so that the radial hole 12B of the valve core enters the bypass valve sleeve 13, the bypass valve B is closed, and the flushing fluid enters the screw drill C downwards. When an oil pipe is added and connected, the cement truck is closed, the bypass valve core 12 moves upwards to reset under the tension action of the bypass valve spring 14, so that the valve core radial hole 12b and the valve body bypass hole 11a automatically recover a through state, and the pressure of the inner cavity of the pipe column is relieved.

The screw drill C is sequentially provided with a hydraulic motor 16, a universal joint 17 and a transmission shaft 18 from top to bottom, the lower end of the hydraulic motor 16 drives the transmission shaft 18 to rotate through the universal joint 17, and the upper end of the milling shoe D is screwed at the lower end of the transmission shaft 18. The high-pressure well-flushing liquid drives the hydraulic motor 16 to work, the hydraulic motor 16 drives the transmission shaft 18 to rotate through the universal joint 17, and the transmission shaft 18 drives the milling shoe D to rotate so as to carry out milling operation.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention. In addition to the above embodiments, the present invention may have other embodiments. All the technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope claimed by the present invention. The undescribed technical features of the present invention can be realized by or using the prior art, and are not described herein again.

Claims (6)

1. The utility model provides an anti-blocking anti-overflow bores grey tubular column, includes the mill shoe, the upper end of mill shoe has connect its pivoted screw drilling tool of drive soon, the upper end of screw drilling tool has connect bypass valve, its characterized in that soon: a sand setting device is screwed between the upper end of the bypass valve and the oil pipe and comprises a sand setting barrel, an upper connector is screwed at the upper end of the sand setting barrel, a lower connector is screwed at the lower end of the sand setting barrel, a ball discharging sleeve is arranged at the lower part of an inner cavity of the upper connector, and the lower end of the ball discharging sleeve extends out of a lower port of the upper connector; the inner cavity of the sand setting cylinder body is provided with a sand setting core pipe coaxial with the sand setting cylinder body, the lower end of the sand setting core pipe is screwed in an inner screw hole of the lower connector, the upper end of the sand setting core pipe is screwed with a cylindrical one-way valve body, the upper part of the inner cavity of the one-way valve body is spliced with a one-way valve core, the lower part of the one-way valve core is provided with an enlarged valve core frustum, the upper part of the one-way valve core is cylindrical and extends upwards from a reducing hole at the upper end of the one-way valve body, the periphery of the one-way valve core is symmetrically provided with a plurality of flow passing grooves extending along the axial direction, the upper end of the one-way valve core is screwed with a conical cap with an umbrella-; the inner cavity of the one-way valve body is provided with a one-way valve spring, the lower end of the one-way valve spring is supported at the upper port of the sand setting core pipe, and the upper end of the one-way valve spring is abutted against the bottom of the valve core frustum.

2. The anti-blocking anti-overflow drilling ash pipe column according to claim 1, characterized in that: an inner conical surface matched with the valve core frustum is arranged below the reducing hole at the upper end of the one-way valve body.

3. The anti-blocking anti-overflow drilling ash pipe column according to claim 1, characterized in that: the bottom of the valve core frustum is provided with a frustum outer step, and the upper end of the one-way valve spring is sleeved on the frustum outer step.

4. The anti-blocking anti-overflow drilling ash pipe column according to claim 1, characterized in that: the upper end of the ball discharging sleeve is provided with a large-diameter ball discharging sleeve upper boss, the top of the ball discharging sleeve upper boss is symmetrically provided with downward extending discharging holes, and two sides of the lower end of the ball discharging sleeve are symmetrically provided with ball discharging sleeve tenons protruding outwards; the upper part of the inner cavity of the upper joint is an upper joint inner thread section, a reduced upper joint first unthreaded hole section is arranged below the upper joint inner thread section, a reduced upper joint second unthreaded hole section is arranged below the upper joint first unthreaded hole section, a pair of through upper joint long grooves are symmetrically arranged on the inner wall of the upper joint second unthreaded hole section, another pair of upper joint short grooves are also symmetrically arranged on the inner wall of the upper joint second unthreaded hole section, the upper joint short grooves are sunken grooves extending upwards from the bottom of the upper joint, and the upper joint long grooves and the upper joint short grooves are distributed in a cross shape and have the same groove width; the ball discharging sleeve boss is positioned in the inner cavity of the first unthreaded hole section of the upper joint, and the ball discharging sleeve tenon is correspondingly embedded in the upper joint short groove; the ball discharging sleeve is characterized in that a ball discharging sleeve spring is sleeved on the periphery of the ball discharging sleeve, the upper end of the ball discharging sleeve spring abuts against the lower portion of a boss on the ball discharging sleeve, and the lower end of the ball discharging sleeve spring abuts against an inner step at the bottom of the first unthreaded hole section of the upper connector.

5. The anti-blocking anti-overflow drilling ash pipe column according to claim 1, characterized in that: the bypass valve comprises a bypass valve body, a plurality of valve body bypass holes communicated with an inner cavity are uniformly distributed on the circumference of the bypass valve body, a bypass valve sleeve and a bypass valve core are arranged in the inner cavity of the bypass valve body, the lower end of the bypass valve sleeve is fixed on the lower part of a central hole of the bypass valve body through a hole retaining ring, the top of the bypass valve sleeve is lower than the lower edge of the bypass hole of the valve body, and the periphery of the bypass valve sleeve is sealed with the central hole of the bypass valve body through an outer valve sleeve sealing ring; the periphery of the upper part of the bypass valve core is abutted against the lower part of an inner step of a bypass valve body and is sealed with a central hole of the bypass valve body through a bypass valve core O-shaped ring, the lower part of the bypass valve core is provided with a bypass valve core small-diameter section, a plurality of valve core radial holes are uniformly distributed on the circumference of the bypass valve core small-diameter section, the lower end of the bypass valve core small-diameter section is inserted in the central hole of the bypass valve sleeve and is sealed through a valve sleeve inner sealing ring; the bypass valve is characterized in that a bypass valve spring is sleeved on the periphery of the small-diameter section of the bypass valve core, the lower end of the bypass valve spring is supported at the upper port of the bypass valve sleeve, and the upper end of the bypass valve spring abuts against the lower part of the upper outer step of the bypass valve core.

6. The anti-blocking and anti-overflow drilling mud pipe column according to any one of claims 1 to 5, characterized in that: the screw drilling tool is sequentially provided with a hydraulic motor, a universal joint and a transmission shaft from top to bottom, the lower end of the hydraulic motor drives the transmission shaft to rotate through the universal joint, and the upper end of the milling shoe is screwed at the lower end of the transmission shaft.

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