CN111206877A - Liner pipe feeding device and liner pipe feeding method for horizontal drilling under pressure - Google Patents
Liner pipe feeding device and liner pipe feeding method for horizontal drilling under pressure Download PDFInfo
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- CN111206877A CN111206877A CN202010263312.7A CN202010263312A CN111206877A CN 111206877 A CN111206877 A CN 111206877A CN 202010263312 A CN202010263312 A CN 202010263312A CN 111206877 A CN111206877 A CN 111206877A
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- blowout preventer
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- 238000005553 drilling Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 238000007789 sealing Methods 0.000 claims description 38
- 238000003780 insertion Methods 0.000 claims description 36
- 230000037431 insertion Effects 0.000 claims description 36
- 210000002445 nipple Anatomy 0.000 claims description 22
- 230000004323 axial length Effects 0.000 claims description 6
- 239000003245 coal Substances 0.000 abstract description 16
- 238000000605 extraction Methods 0.000 abstract description 4
- 230000007774 longterm Effects 0.000 abstract description 4
- 239000003921 oil Substances 0.000 description 16
- 230000000694 effects Effects 0.000 description 4
- 239000010720 hydraulic oil Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 210000004907 gland Anatomy 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/046—Directional drilling horizontal drilling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/06—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving 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)
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- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to a liner tube feeding device and a liner tube feeding method for horizontal drilling under pressure, wherein the liner tube feeding device comprises a plurality of liner tubes, a plurality of drill rods and an orifice pressure maintaining device for horizontal drilling, the two ends of each liner tube are provided with matched threads, the inner diameter of each liner tube is larger than the outer diameter of each drill rod, the orifice pressure maintaining device is provided with a liner tube channel suitable for the liner tube to be inserted and penetrate through, the orifice pressure maintaining device comprises a three-way pipe short section, a gate valve, a first liner tube holder, a blowout preventer, a first cylinder, a second liner tube holder and an annular sealer which are sequentially connected from front to back, the first cylinder is in threaded connection with the second cylinder, and the thread buckle type is the same as the thread buckle type. The liner tubes can be sequentially connected and then sent into the horizontal drill hole with pressure, the liner tubes in the drill hole can completely prevent the drill hole from being blocked due to hole collapse, the long-term safe and smooth gas production channel of the drill hole is ensured, and the continuous and stable extraction amount of coal bed gas is ensured.
Description
Technical Field
The invention relates to a liner pipe feeding device with a horizontal drilling hole under pressure and a liner pipe feeding method, and belongs to the field of horizontal drilling and coal bed gas exploitation.
Background
When coal bed gas is mined in a coal mine tunnel, horizontal drilling is generally adopted, and the drilling mode is mainly divided into normal-pressure drilling and pressurized drilling.
Coal quality of coal producing areas such as Yunnan, Guizhou and the like in partial areas of China is soft, ground stress is relatively large, after a final hole is withdrawn from a drilling tool, a large-area collapse block and slag falling phenomenon can occur in the hole in a short time, and a drill hole can be completely blocked seriously, so that coal bed gas extraction quantity is rapidly attenuated, and an original planned extraction target cannot be realized. For coal seams with soft coal quality, the drilling under pressure is easier to realize longer drilling depth compared with normal-pressure drilling, and has a certain inhibiting effect on hole collapse in the drilling hole, but the situation that the drilling hole is blocked by the collapsed hole cannot be avoided in long-term drainage and mining, and the long-term safe and smooth gas production channel of the drilling hole cannot be ensured.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the liner pipe feeding device with the horizontal drilling hole under pressure and the liner pipe feeding method adopting the liner pipe feeding device, so that the condition of hole collapse during the drainage of coal bed gas in the horizontal drilling hole can be effectively avoided.
The technical scheme for realizing the aim of the invention is as follows: a liner tube feeding device with pressure for horizontal drilling comprises a plurality of liner tubes, a plurality of drill rods and an orifice pressurizer for horizontal drilling, wherein the liner tubes are provided with axially hollow tube holes, the inner diameter of the liner tubes is larger than the outer diameter of the drill rods, the orifice pressurizer is provided with liner tube channels suitable for the liner tubes to be inserted and to pass through, the orifice pressurizer comprises a three-way pipe nipple, a gate valve, a first liner tube holder, a blowout preventer, a first cylinder, a second liner tube holder and an annular sealer which are coaxially and detachably connected from front to back, the first cylinder is in threaded connection with the second cylinder, two ends of the liner tubes are provided with matched threads, the thread buckle type between the first cylinder and the second cylinder is the same as the thread buckle type between the two liner tubes after threaded connection, a first outlet of the three-way pipe nipple is connected with the gate valve, and a stop valve is arranged at a second outlet of the three-way pipe nipple, and a pressure release valve is arranged on the first cylinder.
Preferably, the rear end of the first barrel is provided with an external thread, the front end of the second barrel is provided with an internal thread matched with the external thread, and the axial length of the external thread is not less than 1 meter.
Preferably, first lining pipe holder includes annular housing, annular housing is equipped with the holder shaft hole that the axial runs through, the pneumatic cylinder is installed to annular housing's radial bilateral symmetry, the pneumatic cylinder is two effect single piston rod formula pneumatic cylinders, the non-tooth slips is installed to the tip of the piston rod of pneumatic cylinder, the non-tooth slips orientation the holder shaft hole, be equipped with on the casing and be suitable for the piston rod with the radial passageway of non-tooth slips reciprocating motion, be equipped with on the annular housing with the hydraulic fluid port of the oil pocket intercommunication of pneumatic cylinder, second lining pipe holder with first lining pipe holder's structure is the same.
Preferably, the blowout preventer is a semi-closed ram blowout preventer.
Preferably, the annular seal ware includes that tube-shape casing, tube-shape glue core and tube-shape piston, and the internal diameter of three is the same, the one end of tube-shape piston is equipped with radial outside flange portion, be equipped with the recess of radial outside step form on the inner wall of tube-shape casing, the internal diameter of the first step groove of recess is greater than the internal diameter of second step groove, the tube-shape glue core with flange portion coaxial arrangement is in first step inslot, the constant diameter portion sliding seal of tube-shape piston installs in the second step inslot, the flange portion front end with the butt of tube-shape glue core, the rear end of flange portion with leave the clearance between the lateral wall of first step groove, be equipped with on the tube-shape casing inside and outside run through and with the hydraulic passage of clearance intercommunication.
Preferably, a plurality of inner and outer through gaps are uniformly and densely distributed on the liner tube.
Preferably, a plurality of the front end of one lining pipe in the lining pipe is equipped with the drill bit, a plurality of the front end of one drilling rod in the drilling rod is connected with the check valve nipple joint, the front end of check valve nipple joint is connected with the first nipple joint of inserting, the first nipple joint of inserting that runs through around being equipped with shaft hole of the first nipple joint of inserting, the first nipple joint of inserting is including the portion of inserting that is located the front end and being located rear end connecting portion, the rear end of drill bit is equipped with and is suitable for the portion of inserting inserts and radial fixed slot.
A method of running a liner using the horizontal bore liner running apparatus, comprising the steps of:
(1) coaxially connecting the front end of the orifice pressurizer with a hole sealing pipe of the horizontal drill hole, and closing the gate valve;
(2) inserting a first liner with a drill bit into the liner passage from a rear end of the orifice pressurizer and pushing the first liner forward to a position just past the annular sealer, closing the annular sealer, opening the gate valve;
(3) continuing to push the first liner forward to a position just past the blowout preventer, closing the first liner holder to grip the first liner, closing the blowout preventer;
(4) opening the pressure relief valve, relieving pressure in a liner passage between the blowout preventer and the annular sealer, and opening the annular sealer;
(5) inserting a second liner into the liner passage from a rear end of the orifice pressurizer and pushing the second liner forward to a position just past the annular sealer, closing the second liner holder to hold the second liner, closing the annular sealer, opening the blowout preventer;
(6) rotating the second cylinder to screw the rear end of the first cylinder into the front end of the second cylinder, the second cylinder driving the second liner tube to rotate forward to gradually approach and screw the front end of the second liner tube into the rear end of the first liner tube, and opening the first liner tube holder and the second liner tube holder;
(7) advancing the second liner to a position just past the blowout preventer, closing the first liner holder to grip the second liner, closing the blowout preventer;
(8) repeating the steps (4) to (7), continuously inserting the liner into the liner channel until the first liner is pushed to a gas production layer, pushing the last liner forward to a position just passing through the gate valve, and closing the gate valve;
(9) removing a member behind the gate valve on the orifice dwell.
Preferably, each liner tube in the step (2), the step (3) and the step (7) is pushed forwards by using a drill rod inserted into a tube hole of the liner tube or a plurality of drill rods connected in sequence, and the liner tube in the step (5) is guided by using the drill rod or the plurality of drill rods connected in sequence when being inserted into the liner tube channel.
Preferably, in the step (2), after the first liner pipe is inserted into the liner pipe channel, a first drill pipe with the check valve short section and the plug-in short section is inserted into the pipe hole of the first liner pipe from the rear end of the first liner pipe, the insertion part is inserted into the fixing groove, the first liner pipe is pushed forward by pushing the first drill pipe forward, and after the ring sealer is closed, the cylindrical rubber core clamps the first drill pipe and seals an annular space between a shaft hole wall of the ring sealer and the first drill pipe; in the step (3), a second drill pipe is connected to the rear end of the first drill pipe, the first liner pipe is pushed forwards continuously by pushing the second drill pipe forwards, and after the blowout preventer is closed, the semi-sealed core clamps the first drill pipe and seals an annular space between the wall of the shaft hole of the blowout preventer and the first drill pipe; in the step (5), the second liner pipe is sleeved on the second drill pipe and then inserted into the liner pipe channel, and after the annular sealer is closed, the cylindrical rubber core clamps the second drill pipe and seals an annular space between the shaft hole wall of the annular sealer and the second drill pipe; in the step (7), a third drill pipe is connected to the rear end of the second drill pipe, the second liner pipe is pushed forwards continuously by pushing the third drill pipe forwards, and after the blowout preventer is closed, the semi-sealed core clamps the second drill pipe and seals an annular space between the shaft hole wall of the blowout preventer and the second drill pipe; and (8) connecting one or more drill rods at the rear end of the last drill rod, pushing the reconnected drill rod forwards to push the last liner pipe forwards, and withdrawing all drill rods backwards from the liner pipe channel before closing the gate valve.
The invention has the beneficial effects that:
1. according to the invention, the liner tubes can be sequentially connected through the orifice pressurizer and then are conveyed into the horizontal drill hole with pressure, the pressure in the horizontal drill hole is not leaked in the process of conveying the liner tubes into the horizontal drill hole, the connected liner tubes conveyed into the horizontal drill hole can completely prevent the horizontal drill hole from being blocked by collapsed holes, and even if the collapsed holes occur, the liner tubes can support and block collapsed blocks, so that the long-term safe smoothness of a gas production channel of the drill hole is ensured, and the continuous stability of the extraction amount of coal bed gas is ensured.
2. According to the invention, two adjacent liner tubes inserted into the orifice pressurizer in sequence can be fixedly connected simply and conveniently by rotating the second cylinder, so that the adjacent liner tubes are effectively ensured to be connected stably without disconnection, the support and blocking effects on collapsed blocks are further ensured, and the blockage of a drilling gas production channel is avoided.
3. According to the arrangement of the gate valve, the blowout preventer and the annular sealer of the orifice pressurizer, when the liner tube is fed into the horizontal drill hole through the orifice pressurizer, the liner tube channel can be closed in stages, so that the horizontal drill hole is guaranteed not to be decompressed, and hole collapse is avoided.
4. The arrangement of the gaps on the liner tube can provide a passage for coal bed gas to enter the liner tube and can prevent larger coal blocks from entering the liner tube to cause blockage.
5. The liner tube is pushed into the horizontal drilling hole through the drill rod, the drill bit is arranged at the front end of the first liner tube, the front end of the first drill rod is fixedly connected with the drill bit in an inserting mode, the drill bit can be driven to rotate through the drill rod in the process that the liner tube is sent into the horizontal drilling hole, the blockage in the horizontal drilling hole is cleaned, and the liner tube is guaranteed to be smoothly pushed into the horizontal drilling hole.
Drawings
FIG. 1 is a schematic view of the orifice pressurizer of the present invention installed in an orifice of a horizontal borehole;
FIG. 2 is a schematic structural view of a tee sub of the present invention;
FIG. 3 is a schematic view of the construction of a first liner holder of the present invention;
FIG. 4 is a schematic structural view of a blowout preventer of the present invention;
FIG. 5 is a schematic view of the construction of the annular seal of the present invention;
FIG. 6 is a schematic representation of the liner with bit of the present invention;
FIG. 7 is a schematic structural diagram of a one-way valve nipple of the present invention;
FIG. 8 is a schematic structural diagram of the insertion head sub of the present invention;
FIG. 9 is a flow chart of the method of running a liner with horizontal bore hole of the present invention.
Detailed Description
Referring to fig. 1 and 2, the present invention discloses a liner running device with a horizontal bore, which comprises a plurality of liners 17, a plurality of drill rods 16 and an orifice pressure maintaining device for the horizontal bore, wherein the liners are provided with axial hollow pipe orifices, the inner diameter of the liners is larger than the outer diameter of the drill rods, the pipe orifices are suitable for the drill rods to insert and pass through, and the length of the drill rods is preferably larger than the length of the liners. The orifice pressurizer is provided with a liner pipe channel suitable for the liner pipe to insert and penetrate, the orifice pressurizer comprises a three-way pipe nipple 5, a gate valve 6, a first liner pipe holder 7, a blowout preventer 8, a first cylinder 9, a second cylinder 10, a second liner pipe holder 13 and an annular sealer 12 which are coaxially and detachably connected from front to back in sequence, the three-way pipe nipple is a T-shaped three-way pipe nipple, a horizontal first outlet of the three-way pipe nipple is connected with the gate valve, a horizontal through hole between an inlet and a first outlet of the three-way pipe nipple, a valve hole of the gate valve, a holder shaft hole of the first liner pipe holder, a blowout preventer shaft hole of the blowout preventer, a through hole of the first cylinder and a through hole of the second cylinder, the holder shaft hole of the second liner pipe holder and the sealer shaft hole of the annular sealer jointly form the liner pipe channel, the three-way pipe nipple, the gate valve, the first liner pipe holder, the blowout preventer and the first cylinder are preferably connected through flanges, the second cylinder, the second liner pipe holder and the annular sealer are preferably connected through flanges, and a sealing ring is preferably arranged between the connecting flanges to improve the sealing effect of the connecting end. The first cylinder is in threaded connection with the second cylinder, the two ends of the liner tubes are provided with threads matched with each other, and thread buckling types between the first cylinder and the second cylinder are the same as thread buckling types between two liner tubes after threaded connection, so that screwing/unscrewing directions of the threaded connection between the first cylinder and the second cylinder are the same as screwing/unscrewing directions between two liner tubes after threaded connection.
The threaded connection structure of the first cylinder and the second cylinder can be as follows: the thread buckling type between the first barrel and the second barrel is a reverse buckling thread, an external thread is arranged at the rear end of the first barrel, an internal thread matched with the external thread is arranged at the front end of the second barrel, the axial length of the external thread is not less than 1 meter, so that the maximum distance between the rear end of the first barrel and the front end of the second barrel after the first barrel and the second barrel are in threaded connection is not less than 1 meter, for example, the axial length of the external thread is 1 meter, and the rear end of the first barrel can be screwed into the front end of the second barrel after the first barrel and the second barrel are in threaded connection is 0-1 meter. The outer thread with preferably leave the interval between the tip of the rear end of first barrel, annular seal ring groove can be seted up on the barrel of interval department, install annular seal ring in the seal ring groove to realize first barrel with sealed behind the second barrel threaded connection, the quantity in seal ring groove can be a plurality of, like 3, correspondingly, annular seal ring also is 3. The axial length of the internal thread is the same as or different from that of the external thread, the axial length of the internal thread is preferably different from that of the external thread and smaller than that of the external thread, for example, 0.2 m, and the inner wall of the second cylinder body except the internal thread is a smooth inner surface. The length of the liner tube is preferably greater than the minimum length of the first cylinder body after the first cylinder body is in threaded connection with the second cylinder body, and is less than the maximum length of the first cylinder body after the first cylinder body is in threaded connection with the second cylinder body.
And a stop valve 2 is arranged at a vertical second outlet of the three-way pipe nipple, when the pressure in the horizontal drilling hole and/or the liner pipe channel is reduced, the stop valve can be opened to supplement the pressure, and a flange can be arranged at an inlet of the three-way pipe nipple and is used for connecting the orifice pressurizer with a hole sealing pipe 1 of the horizontal drilling hole when the orifice pressurizer is arranged on the orifice of the horizontal drilling hole. A pressure gauge interface can be arranged on the three-way pipe nipple, and a pressure gauge 3 is installed on the pressure gauge interface so as to display the pressure in the through hole of the three-way pipe nipple in real time, namely the pressure in the horizontal drilling hole. And the first cylinder is provided with a pressure release valve 11 for releasing the pressure in the first cylinder and the second cylinder.
When the orifice pressurizer is used, the orifice pressurizer is connected with the orifice of a hole sealing pipe of a horizontal drilling hole through a flange on the inlet of the three-way pipe nipple, and the gate valve is used for sealing the channel of the liner pipe when no liner pipe passes through the valve hole.
Referring to fig. 3, the first liner clamp is typically hydraulically powered to clamp the liner, with the string size suitable for clamping matching the outer diameter size of the liner. The first liner clamp may include an annular housing 45, which is provided with a clamp shaft bore extending axially therethrough, the radial two sides of the shell are symmetrically provided with hydraulic cylinders 49 which are preferably double-acting single-piston rod type hydraulic cylinders, the cylinder bodies are internally provided with pistons, the piston is in sliding sealing fit with the inner wall of the cylinder body, a sealing ring 55 is arranged on the radial outer edge of the piston, the end of the piston rod 47 of the piston is fitted with a slip 46, which faces the gripper shaft hole, the shell is provided with a radial channel suitable for the piston rod and the toothless slip to reciprocate, the radial passage is communicated with the shaft hole of the holder, an oil port is arranged on the annular shell, the oil port is communicated with an oil cavity of the hydraulic cylinder through an oil path pipe 42, and an oil inlet flange 56 is arranged on the oil port, so that the oil port is convenient to connect with an external oil supply device. Generally, the radial both sides of annular casing have left side door 44 through side door bolt 43 fixed mounting with right side door 48, the left side door with the right side door with install sealing washer 52 between the annular casing, two the pneumatic cylinder is installed respectively the left side door with the outside of right side door, the left side door with all be equipped with on the right side door and supply the piston rod passes the through-hole, the through-hole with radial passageway intercommunication, the piston rod pass the through-hole and with the inner wall sliding seal cooperation of through-hole, can be equipped with a plurality of sealing washer 53, 54 on the inner wall of through-hole, the no tooth slips is located in radial passageway and with radial passageway's inner wall sliding seal cooperation, two cylinder cap 41, 50 can be installed through cylinder cap bolt 40, 51 respectively in the outside of pneumatic cylinder. The oil chambers of the two hydraulic cylinders can be communicated annular oil chambers, namely, two radially symmetrical pistons and piston rods are arranged on one annular oil chamber in a matched mode, and synchronous control of the symmetrical pistons and the symmetrical piston rods is facilitated. When the first liner pipe holder is closed, hydraulic oil enters the oil pipeline from the oil inlet flange and then enters an outer cavity of an oil cavity of the hydraulic cylinder, a piston and a piston rod are pushed to drive the two toothless slips to simultaneously move towards the center of the shaft hole of the holder until the liner pipe is clamped, and the arrangement of the toothless slips can realize the nondestructive clamping of the liner pipe; when the first liner tube holder is opened, hydraulic oil enters an inner cavity of an oil cavity of the hydraulic cylinder, a piston and a piston rod are pushed, two toothless slips are driven to move towards the direction far away from the center of the shaft hole of the holder at the same time, and the purpose of loosening the liner tube is achieved.
The second liner holder is preferably of the same construction as the first liner holder.
Referring to fig. 4, the blowout preventer is preferably a half-closed ram manual blowout preventer, and the blowout preventer may include an annular blowout preventer housing 28, the blowout preventer housing is provided with a blowout preventer shaft hole which axially penetrates through, half-closed ram assemblies are symmetrically installed on two radial sides of the blowout preventer housing, each half-closed ram assembly includes a horizontal lead screw 36, a thrust bearing 35, a horizontal ram shaft 32, a half-closed ram 30 and a half-closed rubber core 29 which are sequentially installed from outside to inside, the half-closed rubber core faces the blowout preventer shaft hole, and a radial ram channel suitable for the half-closed rubber core, the half-closed ram and the ram shaft to reciprocate is arranged on the blowout preventer housing, and the ram channel is communicated with the blowout preventer shaft hole. Usually, the radial both sides of the preventer shell are fixedly provided with side doors 27 through side door bolts 26, 34, a sealing ring 37 is arranged between the side doors and the preventer shell, shaft sleeves 33 are respectively arranged at the outer sides of the two side doors, the ram shaft, the thrust bearing and the lead screw are coaxially sleeved in the shaft sleeves in a sliding manner, through holes for the ram shaft to pass through are arranged on the side doors, the through holes are communicated with the ram channel, the ram shaft passes through the through holes and is in sliding sealing fit with the inner wall of the through holes, a plurality of sealing rings 38, 39 can be arranged on the inner wall of the through holes, the semi-closed ram and the semi-sealed core are positioned in the ram channel, the semi-closed ram is in sliding sealing fit with the inner wall of the ram channel, a sealing member 31 is arranged on the radial outer wall of the semi-closed ram, and a pressure cap 25 is buckled at the outer, the screw rod hole for the screw rod to pass through is arranged on the gland, and the screw rod is in rotary sealing fit with the screw rod hole. The semi-sealing rubber core of the blowout preventer is usually replaceable, and the semi-sealing rubber core with the appropriate semi-sealing size can be selected according to the outer diameter of a drill rod required to be clamped, wherein the common semi-sealing size is 70mm, 73mm or 89mm and the like. When a drill rod is inserted into the shaft hole of the blowout preventer and the blowout preventer needs to be closed, the two screw rods are rotated simultaneously, the ram shaft drives the half-sealed ram and the half-sealed rubber core to move towards the center of the shaft hole of the ram under the pushing of the thrust bearing until the two half-sealed rubber cores want to contact and tightly hold the drill rod, then a certain load is applied to enable the half-sealed rubber core to be squeezed and deformed, so that the shaft hole of the blowout preventer is closed, the ram shaft is usually provided with a limiting device, and the axis of the shaft hole of the blowout preventer is not allowed to exceed when the half-sealed ram moves towards the center of the shaft hole of the blowout preventer; when the blowout preventer needs to be opened, the two screw rods rotate reversely at the same time, and the half-sealing rubber core and the half-sealing gate are driven by the gate shaft and the thrust bearing to move towards the direction far away from the center of the shaft hole of the blowout preventer, so that the purpose of opening the shaft hole of the blowout preventer is achieved.
Referring to fig. 5, the annular sealer is normally hydraulically controlled, and when closed, can seal the annular space between the inner wall of the axial hole of the annular sealer and the drill rod and still maintain the sealing effect when the drill rod rotates and moves axially. The annular sealer can comprise a cylindrical shell, a cylindrical rubber core 57 and a cylindrical piston 61, the inner diameters of the three are the same, one end of the cylindrical piston is provided with a radial outward flange part, the inner wall of the cylindrical shell is provided with a radial outward step-shaped groove, the inner diameter of a first step groove of the groove is larger than that of a second step groove, the cylindrical rubber core and the flange part are coaxially arranged in the first step groove, the flange part is in sliding sealing fit with the bottom wall of the first step groove, the radial outer edge of the flange part is provided with a plurality of sealing rings 59, the equal-diameter part of the cylindrical piston is in sliding sealing installation in the second step groove, the radial outer wall of the neck part is provided with a plurality of sealing rings 60, the front end of the flange part is abutted to the cylindrical rubber core, and a gap is left between the rear end of the flange part and the side wall of the first step groove, the clearance constitutes the hydraulic pressure chamber, be equipped with inside and outside run through on the tube-shape casing and with the hydraulic pressure passageway of hydraulic pressure chamber intercommunication, the inner wall of tube-shape casing the inner wall of core is glued to the tube-shape with the inner wall of the piston of tube-shape constitutes the annular seal ware shaft hole of constant diameter jointly, be equipped with radial outside spacing groove on the diapire of second step groove, the rear end of constant diameter portion is equipped with radial outside convex spacing ring 62, the spacing ring is located the spacing inslot, spacing ring with clearance fit or sliding fit between the spacing groove, the spacing groove with the setting of spacing ring is used for the tube-shape piston to the tube-shape piston limits when the direction of core is glued to the tube-shape moves the maximum displacement of tube-shape piston, avoids the tube-shape piston is to under hydraulic pressure the too big cause of the extrusion force of core is glued to the tube-shape annular seal ware damages. The cylindrical shell can be composed of a gland 65, a cylinder body 58 and a base 64 which are coaxially connected from front to back in sequence, the gland, the cylinder body and the base are all provided with shaft holes, the rear end of the cylinder body is preferably inserted into the front end of the base, a sealing ring 63 is arranged on the radial outer wall of the rear end of the cylinder body, and the shaft hole of the cylinder body is step-shaped to form a step-shaped groove of the cylindrical shell. When a drill rod is inserted into the annular sealer shaft hole and the annular sealer needs to be closed, hydraulic oil is injected into the hydraulic cavity through the hydraulic channel by using a manual hydraulic pump to push the cylindrical piston to move forwards and extrude the cylindrical rubber core to enable the cylindrical rubber core to protrude inwards in the radial direction and slowly hold the drill rod tightly, so that the purpose of sealing the annular sealer shaft hole is achieved, after the annular sealer is closed, sealing effects of different degrees can be achieved by adjusting the pressurizing pressure of the manual hydraulic pump, and the annular sealer shaft hole can still be well sealed when the drill rod rotates or moves axially; when the annular sealer needs to be opened, a pressure relief valve on the manual hydraulic pump is opened to relieve pressure, hydraulic oil flows back into the manual hydraulic pump from the hydraulic cavity, and the cylindrical rubber core resets to achieve the purpose of opening the shaft hole of the annular sealer.
Referring to fig. 6, a plurality of inner and outer through slits 24 are preferably uniformly distributed on the liner tube, the plurality of slits may be arranged in a matrix on the wall of the liner tube, the length of the slits may be 80-120mm, such as 80mm, 100mm or 120mm, the width of the slits may be 0.3-0.6mm, such as 0.3mm, 0.5mm or 0.6mm, and the slits are arranged to provide a passage for coal bed gas to enter the liner tube and prevent larger coal lumps from entering the liner tube to cause blockage.
Referring to fig. 6, 7 and 8, a drill bit 4 is preferably arranged at the front end of one of the plurality of liner tubes, the drill bit and the liner tube in which the drill bit is arranged are generally of an integrated structure, the material of the drill bit is preferably copper or other nonferrous metals, a check valve short section is connected to the front end of one of the plurality of drill rods, an insertion head short section 14 is connected to the front end of the check valve short section 15 in a preferably threaded connection manner, in the process that the plurality of liner tubes are inserted into the liner tube channel, a liner tube with the drill bit is inserted first, the drill bit faces forward, in the process that the plurality of drill rods are inserted into the liner tube channel, the drill rod with the check valve short section and the insertion head short section is inserted first, and the insertion head short section faces forward. The one-way valve short section is provided with a one-way valve short section shaft hole which penetrates through the front and the back, the front part in the one-way valve short section shaft hole is provided with a protective net 23 which covers the cross section of the shaft hole, the rear part in the one-way valve short section shaft hole is provided with a valve seat 22 which covers the cross section of the shaft hole, the valve seat is provided with a through hole which penetrates through the front and the back, a setting ball 21 which can roll freely in a cavity is arranged in a cavity between the protective net and the valve seat, the diameter of the setting ball is larger than the aperture of the through hole, the edge of the front end of the through hole is preferably chamfered so as to facilitate setting of the setting ball, the protective net is used for preventing the setting ball from deviating from the one-way valve short section, the setting of the one-way valve short section plays the roles of only allowing fluid to flow from a drill rod to a horizontal hole and forbidding, and closing the one-way valve short section. The insertion head short section is of an integral structure and is provided with a front-back penetrating insertion head short section shaft hole, the insertion head short section comprises an insertion part and a rear-end connecting part 20, the insertion part comprises a cylinder insertion part 18 and a cuboid insertion part 19, the cylinder insertion part is located at the front end, the cross section of the cuboid insertion part is square, a sealing ring is arranged on the radial outer wall of the cylinder insertion part, the sealing ring can be one or more, the insertion head short section is connected with the check valve short section through the connecting part, the connecting part is cylindrical, the outer diameter of the connecting part is the same as that of the drill rod, the diagonal length of the cross section of the cuboid insertion part is smaller than the outer diameter of the connecting part, the outer diameter of the cylinder insertion part is smaller than the side length of the cross section of the cuboid insertion part, the rear end of the drill bit is provided with a side length, and the fixing groove adopts a, the fixed slot is preferably suitable for the insertion part is inserted into the cylinder insertion part, the sealing ring on the cylinder insertion part realizes the sealing between the two, and the cuboid insertion part realizes the radial fixation between the two, so that the drill rod drives the insertion head short section rotates and drives the drill bit to rotate.
Referring to fig. 9, the invention also discloses a liner running method using the liner running device with the horizontal bore hole under pressure, which comprises the following steps:
(1) coaxially connecting the front end of the orifice pressurizer with a hole sealing pipe of the horizontal drill hole, closing the gate valve and keeping the pressure in the horizontal drill hole;
(2) inserting a first liner with a drill bit into the liner passage from a rear end of the orifice pressurizer and pushing the first liner forward to a position just past the annular sealer, closing the annular sealer, opening the gate valve;
(3) continuing to push the first liner forward to a position just past the blowout preventer, closing the first liner holder to grip the first liner, closing the blowout preventer;
(4) opening the pressure relief valve, relieving pressure in a liner passage between the blowout preventer and the annular sealer, and opening the annular sealer;
(5) inserting a second liner into the liner passage from a rear end of the orifice pressurizer and pushing the second liner forward to a position just past the annular sealer, closing the second liner holder to hold the second liner, closing the annular sealer, opening the blowout preventer;
(6) rotating the second cylinder to screw the rear end of the first cylinder into the front end of the second cylinder, the second cylinder driving the second liner tube to rotate forward to gradually approach and screw the front end of the second liner tube into the rear end of the first liner tube, and opening the first liner tube holder and the second liner tube holder;
(7) advancing the second liner to a position just past the blowout preventer, closing the first liner holder to grip the second liner, closing the blowout preventer;
(8) repeating the steps (4) to (7), continuously inserting the liner into the liner channel until the first liner is pushed to a gas production layer, pushing the last liner forward to a position just passing through the gate valve, and closing the gate valve;
(9) removing a member behind the gate valve on the orifice dwell.
Preferably, each liner pipe in the step (2), the step (3) and the step (7) is pushed forwards by a drill rod inserted into a pipe hole of the liner pipe or a plurality of drill rods connected in sequence, and as the insertion part of the drill rod with the insertion head short section is inserted into the drill bit on the first liner pipe, the liner pipe can be pushed forwards in the liner pipe channel by pushing the drill rod or the plurality of drill rods connected in sequence forwards. And (5) guiding the liner pipe in the step (5) by adopting the drill pipe or a plurality of drill pipes connected in sequence when the liner pipe is inserted into the liner pipe channel, namely sleeving the liner pipe outside the drill pipe and then inserting the liner pipe into the liner pipe channel.
Preferably, in the step (1), before the orifice pressure maintaining device is coaxially connected with the hole sealing pipe, all drilling tools are withdrawn from the horizontal drilling hole after the final hole, and the original orifice device is removed. In the step (2), after the first liner pipe is inserted into the liner pipe channel, a first drill pipe with the check valve short section and the insertion head short section is inserted into a pipe hole of the first liner pipe from the rear end of the first liner pipe, the insertion part is inserted into the fixing groove, the first liner pipe is pushed forward by pushing the first drill pipe forward, and after the annular sealer is closed, the cylindrical rubber core clamps the first drill pipe and seals an annular space between the shaft hole wall of the annular sealer and the first drill pipe. In the step (3), a second drill rod is connected to the rear end of the first drill rod, the first liner pipe is pushed forwards continuously by pushing the second drill rod forwards, and after the blowout preventer is closed, the semi-sealing core clamps the first drill rod and seals an annular space between the wall of the shaft hole of the blowout preventer and the first drill rod. In the step (5), the second liner tube is sleeved on the second drill rod and then inserted into the liner tube channel, and after the annular sealer is closed, the cylindrical rubber core clamps the second drill rod and seals an annular space between the shaft hole wall of the annular sealer and the second drill rod. In the step (7), a third drill rod is connected to the rear end of the second drill rod, the second liner pipe is pushed forwards continuously by pushing the third drill rod forwards, and after the blowout preventer is closed, the semi-sealed core clamps the second drill rod and seals an annular space between the shaft hole wall of the blowout preventer and the second drill rod. In the step (8), one or more drill rods are connected to the rear end of the last drill rod, the drill rod which is connected again is pushed forwards so as to push the last liner pipe forwards, all the drill rods are withdrawn backwards from the liner pipe channel before the gate valve is closed, and the coal bed gas drainage and mining operation link can be entered after the gate valve is closed.
Claims (10)
1. The liner tube feeding device with the pressure for the horizontal drilling is characterized by comprising a plurality of liner tubes, a plurality of drill rods and an orifice pressure maintaining device for the horizontal drilling, wherein the liner tubes are provided with axially hollow tube holes, the inner diameter of each liner tube is larger than the outer diameter of each drill rod, the orifice pressure maintaining device is provided with a liner tube channel suitable for the liner tubes to be inserted and penetrate, the orifice pressure maintaining device comprises a three-way tube short section, a gate valve, a first liner tube holder, a blowout preventer, a first cylinder body, a second liner tube holder and an annular sealer which are sequentially and coaxially detachably connected from front to back, the first cylinder body is in threaded connection with the second cylinder body, the two ends of each liner tube are provided with matched threads, the thread buckle type between the first cylinder body and the second cylinder body is the same as the thread buckle type between the two liner tubes after the thread connection, a first outlet of the three-way tube short section is, and a stop valve is arranged at a second outlet of the three-way pipe nipple, and a pressure release valve is arranged on the first cylinder.
2. The liner running device with pressure for horizontal drilling according to claim 1, wherein the rear end of the first cylinder is provided with an external thread, the front end of the second cylinder is provided with an internal thread matched with the external thread, and the axial length of the external thread is not less than 1 meter.
3. The liner pipe feeding device with the pressure for the horizontal drilling according to claim 2, wherein the first liner pipe holder comprises an annular shell, the annular shell is provided with a holder shaft hole which axially penetrates through, hydraulic cylinders are symmetrically arranged on two radial sides of the annular shell, the hydraulic cylinders are double-acting single-piston rod type hydraulic cylinders, a non-tooth slip is arranged at the end part of a piston rod of the hydraulic cylinder, the non-tooth slip faces the holder shaft hole, a radial passage suitable for the piston rod and the non-tooth slip to reciprocate is arranged on the shell, an oil port communicated with an oil cavity of the hydraulic cylinder is arranged on the annular shell, and the second liner pipe holder is identical to the first liner pipe holder in structure.
4. The liner running apparatus with pressure horizontal bore hole of claim 3, wherein the blowout preventer is a semi-ram blowout preventer.
5. The liner pipe feeding device with the function of horizontal drilling under pressure as claimed in claim 4, wherein the annular sealer comprises a cylindrical shell, a cylindrical rubber core and a cylindrical piston, the inner diameters of the three are the same, one end of the cylindrical piston is provided with a flange part which is outward in the radial direction, a step-shaped groove which is outward in the radial direction is arranged on the inner wall of the cylindrical shell, the inner diameter of a first step groove of the groove is larger than that of a second step groove, the cylindrical rubber core and the flange part are coaxially arranged in the first step groove, an equal-diameter part of the cylindrical piston is slidably and hermetically arranged in the second step groove, the front end of the flange part is abutted against the cylindrical rubber core, a gap is reserved between the rear end of the flange part and the side wall of the first step groove, and a hydraulic passage which penetrates the inside and outside and is communicated with the gap is arranged on the cylindrical shell.
6. A horizontally bored liner string according to claim 1, 2, 3, 4 or 5 wherein the liner has a plurality of apertures uniformly distributed therethrough.
7. The liner pipe feeding device with the pressure for the horizontal drilling according to claim 6, wherein a drill bit is arranged at the front end of one of the plurality of liner pipes, a check valve short section is connected to the front end of one of the plurality of drill pipes, an insertion head short section is connected to the front end of the check valve short section, an insertion head short section shaft hole is formed in the insertion head short section and penetrates through the insertion head short section from front to back, the insertion head short section comprises an insertion part and a connection part, the insertion part is located at the front end, and a fixing groove is formed in the rear end of the drill bit and is suitable for the insertion part to be inserted and radially fixed.
8. A method of running a liner using the horizontal pressurised drilling liner running apparatus as claimed in claims 1 to 7, characterised by the steps of:
(1) coaxially connecting the front end of the orifice pressurizer with a hole sealing pipe of the horizontal drill hole, and closing the gate valve;
(2) inserting a first liner with a drill bit into the liner passage from a rear end of the orifice pressurizer and pushing the first liner forward to a position just past the annular sealer, closing the annular sealer, opening the gate valve;
(3) continuing to push the first liner forward to a position just past the blowout preventer, closing the first liner holder to grip the first liner, closing the blowout preventer;
(4) opening the pressure relief valve, relieving pressure in a liner passage between the blowout preventer and the annular sealer, and opening the annular sealer;
(5) inserting a second liner into the liner passage from a rear end of the orifice pressurizer and pushing the second liner forward to a position just past the annular sealer, closing the second liner holder to hold the second liner, closing the annular sealer, opening the blowout preventer;
(6) rotating the second cylinder to screw the rear end of the first cylinder into the front end of the second cylinder, wherein the second cylinder drives the second liner tube to rotate forwards, so that the front end of the second liner tube is gradually close to and screwed with the rear end of the first liner tube, the first liner tube holder and the second liner tube holder are opened, and the second cylinder is rotated reversely to reset the second cylinder;
(7) advancing the second liner to a position just past the blowout preventer, closing the first liner holder to grip the second liner, closing the blowout preventer;
(8) repeating the steps (4) to (7), continuously inserting the liner into the liner channel until the first liner is pushed to a gas production layer, pushing the last liner forward to a position just passing through the gate valve, and closing the gate valve;
(9) removing a member behind the gate valve on the orifice dwell.
9. A method of running a liner according to claim 8, wherein each liner in steps (2), (3) and (7) is advanced using a drill pipe or a number of drill pipes connected in series inserted into the bore of the liner, and the liner in step (5) is guided as it is inserted into the liner passage using the drill pipe or a number of drill pipes connected in series.
10. The method of running a liner according to claim 9, wherein in step (2), after inserting the first liner into the liner passage, a first drill pipe with the check valve sub and the stinger sub is inserted into the pipe bore of the first liner from the rear end thereof, the stinger is inserted into the retaining slot, the first liner is pushed forward by pushing the first drill pipe forward, and the ring sealer is closed, the cylindrical rubber core grips the first drill pipe and seals an annular space between a ring sealer shaft bore wall and the first drill pipe;
in the step (3), a second drill pipe is connected to the rear end of the first drill pipe, the first liner pipe is pushed forwards continuously by pushing the second drill pipe forwards, and after the blowout preventer is closed, the semi-sealed core clamps the first drill pipe and seals an annular space between the wall of the shaft hole of the blowout preventer and the first drill pipe;
in the step (5), the second liner pipe is sleeved on the second drill pipe and then inserted into the liner pipe channel, and after the annular sealer is closed, the cylindrical rubber core clamps the second drill pipe and seals an annular space between the shaft hole wall of the annular sealer and the second drill pipe;
in the step (7), a third drill pipe is connected to the rear end of the second drill pipe, the second liner pipe is pushed forwards continuously by pushing the third drill pipe forwards, and after the blowout preventer is closed, the semi-sealed core clamps the second drill pipe and seals an annular space between the shaft hole wall of the blowout preventer and the second drill pipe;
and (8) connecting one or more drill rods at the rear end of the last drill rod, pushing the reconnected drill rod forwards to push the last liner pipe forwards, and withdrawing all drill rods backwards from the liner pipe channel before closing the gate valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010263312.7A CN111206877A (en) | 2020-03-29 | 2020-03-29 | Liner pipe feeding device and liner pipe feeding method for horizontal drilling under pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010263312.7A CN111206877A (en) | 2020-03-29 | 2020-03-29 | Liner pipe feeding device and liner pipe feeding method for horizontal drilling under pressure |
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| CN111206877A true CN111206877A (en) | 2020-05-29 |
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| CN202010263312.7A Pending CN111206877A (en) | 2020-03-29 | 2020-03-29 | Liner pipe feeding device and liner pipe feeding method for horizontal drilling under pressure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112227940A (en) * | 2020-11-18 | 2021-01-15 | 中国石油天然气集团有限公司 | Oil gas well wellhead area is pressed drilling equipment |
| CN112482985A (en) * | 2020-12-15 | 2021-03-12 | 中国石油天然气集团有限公司 | Drilling equipment is pressed in area of oil gas well head |
| CN116201479A (en) * | 2023-01-05 | 2023-06-02 | 中海石油(中国)有限公司海南分公司 | Method for closing and running casing |
-
2020
- 2020-03-29 CN CN202010263312.7A patent/CN111206877A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112227940A (en) * | 2020-11-18 | 2021-01-15 | 中国石油天然气集团有限公司 | Oil gas well wellhead area is pressed drilling equipment |
| CN112227940B (en) * | 2020-11-18 | 2022-11-29 | 中国石油天然气集团有限公司 | Oil gas well wellhead area is pressed drilling equipment |
| CN112482985A (en) * | 2020-12-15 | 2021-03-12 | 中国石油天然气集团有限公司 | Drilling equipment is pressed in area of oil gas well head |
| CN112482985B (en) * | 2020-12-15 | 2022-06-07 | 中国石油天然气集团有限公司 | Drilling equipment is pressed in area of oil gas well head |
| CN116201479A (en) * | 2023-01-05 | 2023-06-02 | 中海石油(中国)有限公司海南分公司 | Method for closing and running casing |
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