CN110552620A - pumping pressure type grouting circulating device for top drive drilling machine - Google Patents

pumping pressure type grouting circulating device for top drive drilling machine Download PDF

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Publication number
CN110552620A
CN110552620A CN201910940712.4A CN201910940712A CN110552620A CN 110552620 A CN110552620 A CN 110552620A CN 201910940712 A CN201910940712 A CN 201910940712A CN 110552620 A CN110552620 A CN 110552620A
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piston
valve core
wall
sealing
drilling machine
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CN201910940712.4A
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CN110552620B (en
Inventor
丁柯宇
肖仰德
陈保山
冯强
董超
杨灿
詹鸿运
吴墨染
齐昌利
黄敏
雷中清
贺彦亮
张欣欣
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China National Petroleum Corp
CNPC Bohai Drilling Engineering Co Ltd
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CNPC Bohai Drilling Engineering Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/08Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/20Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Abstract

the invention discloses a pump pressure type grouting circulating device for a top drive drilling machine, which comprises a flow detection short section, an insertion sealing component and a piston type mud stop valve assembly which are sequentially connected from top to bottom, wherein the flow detection short section consists of a hollow pipe and a plurality of acoustic wave flow meters; the piston type slurry stop valve assembly comprises a piston, a piston spring, a piston sleeve, a valve core spring support, a valve core and a stop valve seat, wherein the piston, the piston spring and the piston sleeve are sequentially sleeved from inside to outside; this grout circulating device has the changeable characteristics of length, and its piston can extend and stretch into to the sleeve pipe when the grout in, effectively prevents mud and wafts the problem of spilling, and puts the sleeve pipe in-process under and can grout, has realized that the sleeve pipe is grout while being intraductal, has shortened the operating cycle greatly.

Description

Pumping pressure type grouting circulating device for top drive drilling machine
Technical Field
The invention relates to the technical field of wellhead grouting circulation during casing running operation, in particular to a pumping pressure type grouting circulation device for a top drive drilling machine.
Background
In a traditional casing running operation site, drilling fluid is generally filled in a pipeline manually held, the labor intensity of workers is high, the wellhead operation environment is poor, and potential safety hazards exist. Particularly, when grouting, the casing pipe column is in a static state, casing sticking and blocking are very easy to happen in a deep well, subsequent treatment difficulty is increased, and operation time is prolonged.
Published patent CN203879429U discloses an automatic grouting circulating device, including drill pipe joint, extension joint, dabber, flexible tube, mud valve and the direction awl of connecting gradually from last to lower, be fixed with the mooring cable ring on the extension joint, be connected with the safety chain on the mooring cable ring, the dabber overlaps with the junction cover of flexible tube and is equipped with the attach fitting, the dabber outer wall cover that is located the attach fitting top is equipped with sealed assembly. The automatic grouting circulating device is fixed in length, the total length of the tool is too long due to the flexible pipe, an upper pneumatic chuck and a lower pneumatic chuck need to be equipped during casing running operation, and a 10m long single-arm hanging ring and a casing conversion hanging clamp need to be equipped. The following problems exist when used on site: the grouting circulation device is too long, the longest single-arm hanging ring in a domestic drilling site is generally 5m, when a casing is hung in a rat hole, the grouting circulation device is jacked to the surface of a drilling platform, a long conversion rope sleeve is needed when the casing is lowered, the casing is hoisted to the top end of a ramp by a small winch, and then the single casing is hoisted by the conversion rope sleeve, so that more potential safety hazards exist; and secondly, once the switch of the upper pneumatic chuck is out of order, the sleeve cannot be placed, an operator needs to climb to the high altitude to manually open the upper pneumatic chuck, and the operation is complex. And thirdly, when the casing running operation is carried out on the domestic drilling site, an upper pneumatic chuck, a lower pneumatic chuck, a 10m long single-arm hanging ring and a casing conversion hanging card are rarely arranged, and the device is poor in applicability.
published patent CN204877269U discloses a quick circulation device for a casing of an oil drilling machine, which comprises a lifting ring, a safety rope, a high-pressure union, a high-pressure pipe, a short drill rod, a baffle, a sealing leather cup, a righting cylinder, a guide block, a hose, a guide head and a liquid outlet. The inner diameter of the sealing sleeve is sealed by adopting a sealing leather cup mode, and as the bearing capacity of the leather cup is lower, sealing is possibly lost under the action of the pressure difference between the upper part and the lower part of the leather cup along with the increase of the circulating discharge capacity, so that the rock debris bed cannot be thoroughly cleaned, and the purpose of effectively reducing resistance cannot be achieved.
It can be seen that the manual grouting measurement is unscientific and inaccurate during the current casing running operation, the judgment of the lifting load in the casing running process is inaccurate, and the downhole abnormity cannot be found in time. The following situations may occur due to the fact that the container is not filled in time: firstly, the inner of the casing is seriously hollowed, the extrusion damage of the casing accessories flows back for suction, the pressure of an annular liquid column drops suddenly, and the collapse of a well wall, the concentrated blocking of drill cuttings in the annular space and the space in the casing are caused. And secondly, too large pressure difference between the inside of the sleeve and the annulus causes sleeve deformation or thread sealing failure, and engineering accidents and economic losses are brought.
Disclosure of Invention
the invention aims to provide a pumping pressure type grouting circulating device for a top drive drilling machine, which overcomes the defects of the prior art and effectively improves the operation environment of a wellhead.
Therefore, the technical scheme of the invention is as follows:
A pumping pressure type grouting circulating device for a top drive drilling machine comprises a piston type mud stop valve assembly connected to the bottom end of a central pipe, wherein the piston type mud stop valve assembly comprises a piston spring, a piston sleeve, a valve core spring support, a valve core spring, a valve core and a stop valve seat; wherein, the piston spring and the piston sleeve are sleeved in turn from inside to outside; the top end of the piston sleeve is sleeved and fixed on the outer side of the bottom end of the pressing cap, and a second annular boss is arranged on the inner wall of the bottom end of the piston sleeve; the piston is of a cylinder structure, a third annular boss is arranged on the outer wall of the top end of the piston, and the inner wall of the upper part of the piston is inwards sunken to form a first annular step, so that the top end of a piston spring sleeved on the outer side of the piston abuts against the upper end face of the third annular boss, and the bottom end of the piston spring is pressed on the upper end face of the second annular boss; the valve seat of the check valve is fixed on the inner side of the top end of the piston, and the hole wall of the central through hole is an arc-shaped wall surface with the inner diameter sequentially increased from top to bottom; the valve core is formed by a cylindrical rod, a circular supporting sheet and a conical rubber end which are sequentially connected and fixed from bottom to top, the outer diameter of the conical rubber end is gradually increased from top to bottom to form a conical structure with the shape and the size matched with those of a central through hole of the valve seat 9 of the stop valve, and a surface seal is formed between the conical structure and the conical structure; the valve core spring support is a cylindrical body which is arranged on the inner side of the piston and is press-fitted on the upper end face of the first annular step, a cylindrical rod through hole in which the valve core is inserted is formed in the center of the cylindrical body, and a plurality of axial overflowing holes surrounding the cylindrical rod through hole are formed in the cylindrical body; the valve core spring is sleeved on the outer side of the valve core in a micro-compression state, the top end of the valve core spring is abutted against the bottom surface of the circular supporting sheet, and the bottom end of the valve core spring is press-fitted on the top surface of the valve core spring support.
Furthermore, the valve core spring is sleeved on the outer side of the valve core in a micro-compression state, so that the pressure of the valve core on the valve seat of the stop valve is not less than 1.5 MPa.
furthermore, the pumping pressure type grouting circulating device for the top drive drilling machine further comprises an insertion sealing assembly, wherein the insertion sealing assembly comprises an upper pressing ring, a sealing rubber cylinder, a lower pressing ring and a pressing cap which are sequentially sleeved on the outer side of the central pipe from top to bottom; the top end of the pressing cap is sleeved and in threaded connection with the outer side of the bottom end of the central pipe, and the upper pressing ring is abutted to the lower end face of the first annular boss arranged in the middle of the central pipe.
Furthermore, the pumping type grouting circulating device for the top drive drilling machine further comprises a flow detection short joint consisting of a hollow pipe and a plurality of acoustic wave flow meters; the bottom end of the hollow pipe is in threaded connection with the top end of the central pipe, and the plurality of acoustic wave flowmeters are fixed on the outer wall of the hollow pipe by adopting an N-shaped connection method or an M-shaped connection method.
Furthermore, the inner diameter of the hollow pipe is adapted to the pressure and the discharge capacity of slurry pumping, so that the inner cavity of the hollow pipe is always in a full pipe pumping state during slurry pumping.
Furthermore, the top end of the hollow pipe is in threaded connection with a drill rod joint, and the inner wall of the top end of the drill rod joint is provided with a connecting internal thread which is used for being in threaded connection with the top drive lower end of the drilling machine.
Furthermore, at least one sealing ring is arranged between the outer wall of the central pipe and the inner wall of the upper pressing ring, so that sealing is formed between the central pipe and the upper pressing ring; at least one sealing ring is arranged at the threaded connection end between the central pipe and the pressing cap, so that threaded sealing connection is formed between the central pipe and the pressing cap; at least one sealing ring is arranged at the threaded connection end between the pressing cap and the piston sleeve, so that threaded sealing connection is formed between the pressing cap and the piston sleeve; at least one sealing ring is arranged between the outer wall of the top end of the piston and the inner wall of the piston sleeve, so that the piston is in sealing connection with the piston sleeve; and at least one sealing ring is arranged at the threaded connection end between the outer wall of the valve seat of the check valve and the inner wall of the piston, so that the valve seat of the check valve and the piston are in threaded sealing connection.
Further, at least one sealing ring is arranged at the threaded end between the central pipe and the hollow pipe, so that threaded sealing connection is formed between the central pipe and the hollow pipe.
further, at least one sealing ring is arranged at the threaded connection end between the hollow pipe and the drill rod joint, so that threaded sealing connection is formed between the hollow pipe and the drill rod joint.
Compared with the prior art, this rig is driven with pumping pressure formula circulating device that is in milk on top has:
1) The grouting circulating device is reasonable in structure, convenient to install, simple to operate, safe and reliable, the piston of the grouting circulating device can extend outwards relative to the piston sleeve, so that the length of the grouting circulating device can be changed, the hoisting of a casing from a rat hole is not influenced, an upper pneumatic chuck, a lower pneumatic chuck, a long single-arm hanging ring, a casing conversion hanging card and the like do not need to be arranged on site, and the operation is convenient; meanwhile, the piston can be extended into the sleeve in advance during grouting, so that the problem of slurry drifting can be effectively prevented, the operation environment of a wellhead is improved, grouting can be performed in the process of putting down the sleeve, grouting while casing is put down is realized, and the operation period is greatly shortened;
2) The valve core of the grouting circulating device adopts vulcanized rubber, and a conical surface sealing form is adopted between the valve core and the valve seat of the check valve, so that compared with the linear sealing of a ball and a ball seat, the grouting circulating device can effectively ensure that slurry is not leaked after a pump is stopped; meanwhile, the valve core spring adopts a pre-compression mode, the opening pressure of the valve core relative to the valve seat of the check valve is kept to be not less than 1.5MPa, and the situation that the slurry remained in the hose line in the top drive ascending process is continuously leaked due to the liquid column pressure during the pump stopping process is effectively prevented, so that the pollution of a drilling platform surface is avoided;
3) The grouting circulating device is additionally provided with the insertion sealing assembly, so that the device can realize sealing in the sleeve under high circulating pressure by plugging the insertion sealing assembly into the sleeve when encountering blockage in the downward direction, thoroughly clean a detritus bed and effectively play a role in reducing the blockage; meanwhile, the sealing rubber cylinder can be correspondingly replaced according to the size of the constructed casing pipe by inserting the sealing assembly in the structural design, so that the construction requirements of the casing pipes with different sizes are met;
4) This grout circulating device realizes measuring mud grout through installing the flow detection nipple joint additional, can guarantee timely grout for the accurate condition provides scientific judgement foundation in the pit, avoids sleeve pipe annex damage, effectively reduces complicated occurence of failure in the pit.
Drawings
FIG. 1 is a schematic structural diagram of a pumping type grouting circulating device for a top drive drilling machine according to the invention;
FIG. 2 is a cross-sectional view of the pump type grouting circulation device for a top drive drilling machine of the present invention;
Fig. 3 is a sectional view of a piston type mud stop valve assembly of the pumping type grouting circulation device for the top drive drilling machine of the present invention.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, which are not intended to limit the invention in any way.
Example 1
A pumping pressure type grouting circulating device for a top drive drilling machine comprises a piston type mud stop valve assembly connected to the bottom end of a central pipe; as shown in fig. 3, the piston type mud check valve assembly comprises a piston spring 1, a piston 2, a piston sleeve 3, a valve core spring support 4, a valve core spring 5, a valve core 6 and a check valve seat 9; wherein the content of the first and second substances,
The piston sleeve 3 is of a cylinder structure, the top end of the piston sleeve is sleeved and fixed on the outer side of the bottom end of the pressing cap 12, and a second annular boss is arranged on the inner wall of the bottom end of the piston sleeve;
The piston 2, the piston spring 1 and the piston sleeve 3 are sleeved in sequence from inside to outside; the piston 2 is of a cylinder structure, a third annular boss is arranged on the outer wall of the top end of the piston 2, and the inner wall of the upper part of the piston is inwards sunken to form a first annular step, so that the top end of a piston spring 1 sleeved on the outer side of the piston 2 abuts against the upper end face of the third annular boss, and the bottom end of the piston spring is pressed on the upper end face of the second annular boss; in the initial state, the piston spring 1 is in an uncompressed state;
The stop valve seat 9 is in threaded connection with the inner side of the top end of the piston 2, is of a cylinder structure with an axial through hole in the center, and the hole wall of the axial through hole is processed into an arc-shaped wall surface with the inner diameter sequentially increasing from top to bottom;
The valve core 6 is composed of a cylindrical rod, a circular supporting sheet and a conical rubber end which are sequentially connected from bottom to top, wherein the top end of the cylindrical rod is fixed at the center of the bottom surface of the circular supporting sheet, the area of the bottom surface of the conical rubber end is the same as that of the circular supporting sheet, and the outer diameter of the conical rubber end is gradually increased from top to bottom to form a conical structure, the shape and the size of the conical structure are matched with those of a central through hole of the valve seat 9 of the stop valve, so that the valve core 6 can be placed in the central through hole of the valve seat 9 of the stop valve, and; specifically, the conical rubber end is made of vulcanized rubber, so that the conical rubber end has certain hardness to ensure that the conical rubber end and the hole wall of the central through hole of the valve seat 9 of the check valve form tight surface sealing degree, and compared with a conventional ball-and-ball seat linear sealing mode, the conical rubber end can effectively ensure that slurry is not leaked after a pump is stopped;
The valve core spring support 4 is of a cylindrical structure and is arranged on the inner side of the piston 2 and is press-fit on the upper end face of the first annular step, a cylindrical rod through hole for inserting a cylindrical rod of the valve core 6 is formed in the center of the valve core spring support 4, and a plurality of axial overflowing holes surrounding the cylindrical rod through hole are formed in the cylindrical body, so that slurry flows into the lower sleeve through the plurality of axial overflowing holes;
The valve core spring 5 is sleeved on the outer side of the valve core 6 in a micro-compression state, the top end of the valve core spring abuts against the bottom surface of the circular support sheet, and the bottom end of the valve core spring 5 is press-fitted on the top surface of the valve core spring support 4; the compression amount of the valve core spring 5 meets the condition that the pressure of the valve core 6 to the valve seat 9 of the check valve is 1.5MPa, so that the valve core has larger movement resistance relative to the piston spring 1, and meanwhile, when the pump is stopped, the continuous leakage of slurry caused by the pressure of a liquid column in the slurry retained in a hose line in the ascending process of the traveling block hook can be effectively prevented, and the pollution of a drilling platform surface is avoided.
In addition, in order to ensure the sealing performance of the device, two sealing rings 8 are arranged on the outer wall of the top end of the piston 2, so that the piston 2 is in sealing connection with the piston sleeve 3; and a sealing ring 7 is arranged on the outer wall of the bottom end of the connecting external thread matched with the check valve seat 9 and the piston 2, so that the check valve seat 9 and the piston 2 are in threaded sealing connection.
The working principle of the pumping pressure type grouting circulating device for the top drive drilling machine is as follows:
In an initial state, the piston 2 is kept to be completely positioned inside the piston sleeve 3 under the action of the piston spring 1, and meanwhile, the valve core 6 is tightly propped against the central through hole of the valve seat 9 of the check valve under the action of the valve core spring 5 to form a sealing state; when slurry is pumped to the position above the stop valve seat 9, the stop valve seat 9 firstly moves downwards under the pushing action of the slurry to drive the piston 2 in threaded connection with the stop valve seat to move downwards, the piston spring 1 starts to be in a compressed state, and the piston 2 continuously moves downwards until the bottom end of the piston extends into the sleeve below to be in butt joint with the sleeve; then, the pumping pressure of the slurry is increased to be more than 1.5MPa, the valve core 6 moves downwards under the pushing action of the slurry, the valve core spring 5 is in a further compressed state, at the moment, the central through hole of the valve seat 9 of the check valve is in an open state, the slurry flows downwards through the central through hole of the valve seat 9 of the check valve and continues to flow downwards through a plurality of axial overflowing holes in the valve core spring support 4 to enter the casing; after the slurry pump is finished, the slurry pump is closed, and at the moment, the valve seat 9 and the valve core 6 of the stop valve lose the pushing action of the slurry, namely, the stop valve and the valve core are restored to the initial positions under the action of the piston spring 1 and the valve core spring 5 respectively.
according to the theory of operation, this pump pressure formula grout circulating device for rig is driven on top has designed the piston can be for piston sleeve reciprocating motion's function in structural design, the changeable purpose of device length has been realized, the spatial position relatively fixed who has solved between present top drive and the elevator can not be adjusted at any time, make the instrument can not contact the rig floor, from not influencing the sleeve pipe hoist and mount from the rat hole, realize simultaneously that the sleeve pipe is in milk simultaneously under the limit, the mud that is not caused between two parties by wind or well head when effectively preventing the operation spills the problem, improve well head operational environment.
example 2
A pumping pressure type grouting circulating device for a top drive drilling machine comprises an insertion sealing component and a piston type mud stop valve assembly which are sequentially connected from top to bottom; wherein the content of the first and second substances,
As shown in fig. 2, the insertion sealing assembly comprises an upper press ring 16, a sealing rubber cylinder 15, a lower press ring 14 and a press cap 12 which are sequentially sleeved on the outer side of a central tube 13 from top to bottom; in particular, the amount of the solvent to be used,
The outer wall of the top end of the central tube 13 is provided with a connecting external thread, correspondingly, the inner wall of the bottom end of the hollow tube 20 is provided with a connecting internal thread matched with the connecting external thread, so that the top end of the central tube 13 is in threaded connection with the bottom end of the hollow tube 20; the outer wall of the bottom end of the central tube 13 is provided with a connecting external thread, correspondingly, the inner wall of the top end of the press cap 12 is provided with a connecting internal thread matched with the connecting external thread, so that the top end of the press cap 12 is in threaded connection with the bottom end of the central tube 13;
a first annular boss is formed on the upper part of the central tube 13 in a protruding manner, so that the top end of an upper press ring 16 sleeved on the outer side of the central tube 13 is abutted against the lower end face of the first annular boss, and meanwhile, a lower press ring 14 is just pressed on the upper end face of the press cap 12;
The outer wall of the lower part of the lower pressing ring 14 is processed into a conical surface with the outer diameter gradually reduced from top to bottom, a plurality of oblique overflowing holes are formed in the position of the conical surface along the circumferential direction, each oblique overflowing hole is formed obliquely upwards from the conical surface, and the included angle between each oblique overflowing hole and the axial direction of the central tube is 30 degrees;
The outer diameter of the sealing rubber tube 15 is larger than the inner diameter of the casing wall during construction, and if the casing with the inner diameter of 121.36cm is constructed, the sealing rubber tube 15 with the outer diameter of 130.2cm is adopted to be installed on the central tube 13;
The specific structure of the piston type mud check valve assembly is the same as that of the piston type mud check valve assembly in embodiment 1, and in the connection relation, specifically, the inner wall of the top end of a piston sleeve of the piston type mud check valve assembly is provided with a connecting internal thread, correspondingly, the outer wall of the bottom end of the pressing cap 12 is provided with a connecting external thread matched with the connecting internal thread, so that the piston sleeve is in threaded connection with the bottom end of the pressing cap 12.
In addition, in terms of component size, the maximum outer diameter of the piston type slurry check valve assembly and the outer diameter of the pressing cap 12 are slightly smaller than the outer diameters of the lower pressing ring 14 and the upper pressing ring 16; in material selection, the upper pressing ring 16 and the lower pressing ring 14 are both made of aluminum alloy, so that the situation that the threads of the sleeve cannot be abraded when the insertion sealing assembly B is inserted into the sleeve can be prevented; the sealing rubber cylinder 15 adopts a sealing rubber cylinder 15 which is sold in the market and internally provided with a metal framework, so that the sealing rubber cylinder 15 has a certain force bearing effect; the sealing rubber tube 15 is an independent component, so that the sealing rubber tube can be replaced randomly according to the size of the casing to be constructed, and the construction requirements of casings with different sizes can be met.
in order to ensure the sealing performance of the device, two sealing rings 16 are arranged on the inner wall of the upper pressing ring 17, so that a seal is formed between the central pipe 13 and the upper pressing ring 17; a sealing ring 11 is arranged at the bottom end of the connecting external thread matched with the central pipe 13 and the pressing cap 12, so that the central pipe 13 and the pressing cap 12 are in threaded sealing connection; a sealing ring 10 is arranged at the top end of the connecting external thread of the pressing cap 12 and the piston sleeve 3, so that the pressing cap 12 and the piston sleeve 3 are in threaded sealing connection.
This top is driven rig and is used pumping pressure formula grout circulating device through set up above piston mud stop valve assembly and insert sealing component, makes when the sleeve pipe is gone into the meeting and is hindered down, can drive through transferring the top and insert sealing component in the sleeve pipe, well liquid enters into the space between sealed packing element 15 and the center tube 13 through the discharge orifice of clamping ring 14 down under big discharge capacity, the high cycle pressure in the sleeve pipe, extrude sealed packing element 15 to expand to the outside, sealed internal diameter, when establishing the circulation, realize inside, outside circulation pressure reaches a steady state of self-balancing. When the circulating pressure enters the cavity of the sealing rubber barrel, the internal pressure and the external pressure of the sealing rubber barrel can be balanced, the influence of the circulating pressure on the sealing rubber barrel is reduced, the sealing in the sleeve is ensured, the aim of thoroughly cleaning the detritus bed with large discharge is fulfilled, the resistance reducing effect is effectively achieved, and the operation safety is guaranteed.
example 3
A pumping pressure type grouting circulating device for a top drive drilling machine is shown in figure 1 and comprises a flow detection short section A, an insertion sealing component B and a piston type mud stop valve assembly C which are sequentially connected from top to bottom.
as shown in fig. 2, the flow sensing nipple a comprises a hollow tube 20 and two sonic flow meters 18; the inner diameter of the hollow pipe 20 is adapted to the pressure and the discharge capacity of slurry pumping, so that the inner cavity of the hollow pipe is always in a full pipe pumping state when slurry is pumped; two sonic flowmeters 18 are fixed on the outer wall of the bottom end of the hollow pipe 20 by adopting an N-shaped connection method, and the bottom end of the hollow pipe 20 is connected to the top end of the central pipe 13 in a threaded mode.
The top end of the hollow pipe 20 is further provided with a drill rod joint 21, specifically, the inner wall of the top end of the drill rod joint 21 is processed with a connecting inner thread for being connected with the top drive lower end thread of the drilling machine, the inner wall of the bottom end of the drill rod joint 21 is processed with a connecting inner thread for being connected with the central pipe thread, correspondingly, the outer wall of the top end of the central pipe 20 is processed with a connecting outer thread adapted to the connecting inner thread of the inner wall of the bottom end of the drill rod joint 21, so that the hollow pipe 20 and the drill.
The specific structure of the plug-in seal assembly and the piston type mud check valve assembly is the same as that of the plug-in seal assembly and the piston type mud check valve assembly in embodiment 2.
In order to maintain the tightness of the device, a sealing ring 19 is arranged on the upper side wall of the external connecting thread which is matched with the central pipe 13 and the hollow pipe 20, so that the central pipe 13 and the hollow pipe 20 are in threaded sealing connection; a sealing ring 22 is arranged on the outer wall above the connecting external thread matched with the drill rod joint 21 of the hollow pipe 20, so that the hollow pipe 20 and the drill rod joint 21 are in threaded sealing connection.
this rig is driven on top is with pump pressure formula grout circulating device sets up flow detection nipple joint through inserting seal assembly B top, realizes providing scientific judgement foundation for the accurate condition in the pit, ensures timely grout, avoids casing accessories to destroy, effectively reduces complicated occurence of failure in the pit.

Claims (9)

1. A pumping pressure type grouting circulating device for a top drive drilling machine is characterized by comprising a piston type mud stop valve assembly connected to the bottom end of a central pipe, wherein the piston type mud stop valve assembly comprises a piston spring (1), a piston (2), a piston sleeve (3), a valve core spring support (4), a valve core spring (5), a valve core (6) and a stop valve seat (9); wherein, the piston (2), the piston spring (1) and the piston sleeve (3) are sleeved from inside to outside in sequence; the top end of the piston sleeve (3) is sleeved and fixed on the outer side of the bottom end of the pressing cap (12), and a second annular boss is arranged on the inner wall of the bottom end of the piston sleeve; the piston (2) is of a cylinder structure, a third annular boss is arranged on the outer wall of the top end of the piston, a first annular step is formed by inwards recessing the inner wall of the upper part of the piston, so that the top end of a piston spring (1) sleeved on the outer side of the piston (2) is abutted against the upper end face of the third annular boss, and the bottom end of the piston spring is pressed on the upper end face of the second annular boss; the valve seat (9) of the check valve is fixed on the inner side of the top end of the piston (2), and the hole wall of the central through hole is an arc-shaped wall surface with the inner diameter sequentially increased from top to bottom; the valve core (6) is formed by a cylindrical rod, a circular supporting sheet and a conical rubber end which are sequentially connected and fixed from bottom to top, the outer diameter of the conical rubber end is gradually increased from top to bottom to form a conical structure with the shape and the size matched with those of a central through hole of the valve seat (9) of the stop valve, and a surface seal is formed between the conical structure and the central through hole; the valve core spring support (4) is a cylindrical body which is arranged on the inner side of the piston (2) and is press-fitted on the upper end face of the first annular step, a cylindrical rod through hole for inserting the valve core (6) is formed in the center of the cylindrical body, and a plurality of axial overflowing holes surrounding the cylindrical rod through hole are formed in the cylindrical body; the valve core spring (5) is sleeved on the outer side of the valve core (6) in a micro-compression state, the top end of the valve core spring is abutted against the bottom surface of the circular supporting sheet, and the bottom end of the valve core spring is pressed on the top surface of the valve core spring support (4).
2. the pumping type grouting circulation device for the top drive drilling machine according to claim 1, wherein the valve core spring (5) is sleeved outside the valve core (6) in a micro-compression state, so that the pressure of the valve core (6) on the valve seat (9) of the check valve is not less than 1.5 MPa.
3. The pumping type grouting circulating device for the top drive drilling machine according to claim 1, further comprising an insertion sealing assembly, wherein the insertion sealing assembly comprises an upper pressing ring (16), a sealing rubber cylinder (15), a lower pressing ring (14) and a pressing cap (12) which are sequentially sleeved on the outer side of the central pipe (13) from top to bottom; the top end of the pressing cap (12) is sleeved and in threaded connection with the outer side of the bottom end of the central pipe (13), so that the upper pressing ring (16) is abutted to the lower end face of the first annular boss in the middle of the central pipe (13).
4. The pumped grouting circulation device for the top drive drilling machine according to claim 1, further comprising a flow rate detection nipple composed of a hollow pipe (20) and a plurality of sonic flow meters (18); the bottom end of the hollow pipe (20) is in threaded connection with the top end of the central pipe (13), and the plurality of acoustic wave flow meters (18) are fixed on the outer wall of the hollow pipe (20) in an N-type connection method or an M-type connection method.
5. The pumped grouting circulation device for the top drive drilling machine according to claim 4, wherein the inner diameter of the hollow pipe (20) is adapted to the pressure and the displacement of slurry pumping, so that the inner cavity of the hollow pipe is always in a full pipe pumping state during slurry pumping.
6. The pumping type grouting circulation device for the top drive drilling machine according to claim 4, wherein a drill rod joint (21) is connected to the top end of the hollow pipe (20) in a threaded mode, and the inner wall of the top end of the drill rod joint (21) is provided with connecting internal threads for being connected with the lower end of the top drive drilling machine in a threaded mode.
7. The pumped grouting circulation device for the top drive drilling machine according to any one of claims 3-6, characterized in that at least one sealing ring is arranged between the outer wall of the central pipe (13) and the inner wall of the upper pressing ring (17) to form a seal between the central pipe (13) and the upper pressing ring (17); at least one sealing ring is arranged at the threaded connection end between the central pipe (13) and the pressing cap (12), so that the threaded sealing connection is formed between the central pipe (13) and the pressing cap (12); at least one sealing ring is arranged at the threaded connection end between the pressing cap (12) and the piston sleeve (3), so that the pressing cap (12) and the piston sleeve (3) are in threaded sealing connection; at least one sealing ring is arranged between the outer wall of the top end of the piston (2) and the inner wall of the piston sleeve (3), so that the piston (2) and the piston sleeve (3) are in sealing connection; and at least one sealing ring is arranged at the threaded connection end between the outer wall of the check valve seat (9) and the inner wall of the piston (2), so that the check valve seat (9) and the piston (2) are in threaded sealing connection.
8. The pumped grouting circulation device for a top drive drilling machine according to claim 4, characterized in that at least one sealing ring is arranged at the threaded end between the central pipe (13) and the hollow pipe (20) to form a threaded sealing connection between the central pipe (13) and the hollow pipe (20).
9. The pumped grouting circulation device for a top drive drilling machine according to claim 6, characterized in that at least one sealing ring is arranged at the threaded end between the hollow pipe (20) and the drill rod joint (21) to form a threaded sealing connection between the hollow pipe (20) and the drill rod joint (21).
CN201910940712.4A 2019-09-30 2019-09-30 Pumping pressure type grouting circulating device for top drive drilling machine Active CN110552620B (en)

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