CN111922387A - Under-pressure drilling device and method - Google Patents
Under-pressure drilling device and method Download PDFInfo
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- CN111922387A CN111922387A CN202010889791.3A CN202010889791A CN111922387A CN 111922387 A CN111922387 A CN 111922387A CN 202010889791 A CN202010889791 A CN 202010889791A CN 111922387 A CN111922387 A CN 111922387A
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- drill rod
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- rod
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B41/00—Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/10—Arrangements for cooling or lubricating tools or work
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
- B23Q5/22—Feeding members carrying tools or work
- B23Q5/26—Fluid-pressure drives
Abstract
The invention discloses a pressurized drilling device and a method, which comprises a blowout prevention flange, wherein a central drill rod is inserted in the center of the blowout prevention flange, the bottom of the central drill rod is connected to a drill bit through a centering sleeve, and the top of the central drill rod is connected with a drill rod extension rod; the upper part of the blowout prevention flange is connected with a lower centering beam, the middle part of the lower centering beam is inserted with a central drill rod, two ends of the lower centering beam are inserted with stand columns, the bottoms of the stand columns are fixed on a fixed seat of the valve to be drilled, the central drill rod is connected with a non-releasing beam, and the tops of the stand columns are connected with a stand column extension rod; the top of the upright post extension bar is connected with a motor cross beam, two ends of the motor cross beam are fixed with hydraulic cylinders, the middle part of the motor cross beam is connected with a motor support, a hydraulic motor is arranged on the motor support, the center of the motor support is provided with a connecting spline and a drill rod conversion shaft, an output shaft of the hydraulic motor is connected to the drill rod conversion shaft through the connecting spline, and the bottom of the drill rod conversion shaft is connected with the top of the drill rod extension bar; the hydraulic cylinder and the hydraulic motor are both controlled by a hydraulic control console.
Description
Technical Field
The invention belongs to the technical field of oil and gas exploitation, and particularly relates to a pressurized drilling device and method, which are mainly applied to maintenance of a gas tree main control valve, gathering and transportation pipelines and the like.
Background
Along with the continuation of oil, gas field exploitation time, gas production well head valve causes the valve serious corrosion, valve rod fracture and switch out of control because many-sided reason, wherein if the master control valve switch is motionless, master control valve lead screw fracture etc. lead to the unable operation of master control valve, seriously influence well head normal production, have certain potential safety hazard for follow-up well head operation security greatly reduced.
At present, the conventional method for replacing the main control valve with the fault in China is to replace the main control valve with a new one in a well killing operation or replace the fault main control valve with ice. Some special wellhead master control valves can not be opened and closed, and the problems in the prior art can not be solved due to the fact that no operation channel exists. The main control valve for repairing faults by adopting the well killing operation easily influences the output of an operation wellhead, the follow-up remaining problems are more, the stroke of the existing drilling device in the market is smaller, and the drilling operation range is easily restricted. The prior art is complex, needs a large amount of manpower and material resources to cooperate the operation, the cycle length is long, the expense is high.
Disclosure of Invention
The invention aims to provide a device and a method for drilling under pressure, so as to overcome the defects of the prior art, a new operation channel can be established, the operation is simple, the efficiency is high, the normal production of a wellhead is not influenced, the drilling stroke is large, the drilling requirement under complex well conditions can be met, the driving part of equipment is controlled by hydraulic pressure, and the device is more intelligent and has high operation precision by combining software and hardware.
In order to achieve the purpose, the invention adopts the following technical scheme:
a pressurized drilling device comprises a blowout prevention flange fixed on a standby control valve of a valve to be operated, wherein a central drill rod is inserted into the center of the blowout prevention flange, V-shaped seals used for sealing the central drill rod are arranged on the upper side and the lower side of the blowout prevention flange, the bottom of the central drill rod is connected to a drill bit through a centering sleeve, and the top of the central drill rod is connected with a drill rod extension rod;
the upper part of the blowout prevention flange is connected with a lower centering beam, the middle part of the lower centering beam is inserted with a central drill rod, two ends of the lower centering beam are inserted with stand columns, the bottom of each stand column is fixed on a fixing seat of the valve to be drilled, the central drill rod is connected with a non-releasing beam, the non-releasing beam is positioned on the upper side of the lower centering beam, the middle part of the non-releasing beam is inserted with the central drill rod, two ends of the non-releasing beam are inserted with the stand columns, and the tops of the stand columns are connected with;
the top of the upright post extension bar is connected with a motor cross beam, two ends of the motor cross beam are fixed with hydraulic cylinders, the middle part of the motor cross beam is connected with a motor support, a hydraulic motor is arranged on the motor support, the center of the motor support is provided with a connecting spline and a drill rod conversion shaft, an output shaft of the hydraulic motor is connected to the drill rod conversion shaft through the connecting spline, the lower part of the drill rod conversion shaft is inserted in the center of the motor cross beam, and the bottom of the drill rod conversion shaft is connected with the top of the drill rod;
the hydraulic cylinder and the hydraulic motor are controlled by a hydraulic control console.
Furthermore, two sealing grooves for installing V-shaped seals are arranged in the center of the blowout prevention flange, a V-shaped sealing ring assembly, a V-shaped compression nut and a sealing packing are sequentially arranged in the sealing groove on the upper side from bottom to top, and the V-shaped sealing ring assembly, the V-shaped compression nut and the sealing packing are sequentially arranged in the sealing groove on the lower side from top to bottom.
Furthermore, the blowout prevention flange is fixed on a standby control valve of the valve to be operated through 8 stud bolts and matched nuts, a connecting surface is sealed through an octagonal gasket, and a sensor for measuring medium pressure or temperature parameters and a vent valve for discharging the medium in the operation process are installed on the blowout prevention flange.
Furthermore, the lower centering beam is composed of a male beam and a female beam, the male beam and the female beam are connected through a stud, the lower centering beam is provided with 3 through holes, the size of the middle through hole is matched with that of a central drill rod and used for penetrating through the central drill rod, the left through hole and the right through hole are used for installing a left upright post and a right upright post, and the lower centering beam is used for centering the blowout-preventing flange and preventing the blowout-preventing flange from rotating.
Furthermore, the lower righting crossbeam and the non-releasing crossbeam are both connected with the upright post through upright post limit nuts; and a bearing is arranged between the motor cross beam and the drill rod conversion shaft, the motor support is in threaded connection with the motor cross beam, and the motor support is connected with the hydraulic motor through a bolt.
Furthermore, a cooling water injection port communicated with the drill rod extension rod and the center of the central drill rod is arranged on the motor cross beam.
Furthermore, the drill rod extension rod is connected to the drill rod conversion shaft through threads, the central drill rod is connected with the drill rod extension rod through threads, the centering sleeve is connected with the central drill rod through threads, and the drill bit is connected with the centering sleeve through threads.
Furthermore, a plurality of positioning grooves are formed in the central drill rod and the drill rod extension rod, one positioning groove is used for installing a non-releasing cross beam, and drill rod protection rings are installed on the other positioning grooves.
Furthermore, the top of the hydraulic cylinder is connected with a hydraulic cylinder beam.
A pressurized drilling method comprises the following steps:
the method comprises the following steps: performing a pressure test according to the test process requirements to ensure that the device has no leakage when stabilized at the rated pressure for more than 15 min;
step two: operating a hydraulic control console to control a hydraulic cylinder to drive a central drill rod to move downwards, installing a non-releasing cross beam when the hydraulic cylinder moves to the lower limit position of the hydraulic cylinder, fixing the central drill rod through the non-releasing cross beam, then loosening the connection between the central drill rod and a drill rod conversion shaft, operating the hydraulic control console to push the hydraulic cylinder upwards to enable the hydraulic cylinder to be in the upper limit position, additionally connecting a drill rod extension rod to the upper end of the central drill rod, and repeating the operation to enable a drill bit of the central drill rod to reach the position needing to work;
step three: the hydraulic control console is operated to control the hydraulic cylinder to move downwards, meanwhile, the hydraulic control console is operated to control the hydraulic motor to rotate at a low speed, after a drill bit of the central drill rod is lowered to a specified position, the drill bit is fed continuously, cooling water is turned on, the hydraulic control console is operated to control the hydraulic motor to drive the central drill rod to rotate axially, control pressure on the hydraulic control console is observed, the hydraulic control console is operated continuously to control the hydraulic cylinder to pressurize axially to drive the drill bit to feed, control pressure on the hydraulic control console is observed, the discharge condition of scrap iron is continuously checked in the drilling process, the drilling action is repeated, the drill bits are changed from small to large in sequence, and finally, the drill bits are changed according to requirements to;
step four: and taking out the central drill rod and the drill bit, closing the standby control valve, dismantling the drilling device and accessories, and cleaning the working site.
Compared with the prior art, the invention has the following beneficial technical effects:
the center drill rod can be conveniently and reliably sealed by matching the blowout prevention flange with the V-shaped seal, the central drill rod is conveniently disassembled and assembled under pressure in the drilling process by adopting the non-releasing cross beam, so that the operation process is simple and safe, and the center drill rod is controlled to move up and down by adopting a double-hydraulic-cylinder structure, so that the center drill rod is more stable and reliable in the working process. The structure of the double hydraulic cylinders is beneficial to lengthening the central drill rod, so that the length of the central drill rod can be increased to a longer size.
Furthermore, the V-shaped sealing ring assembly is convenient to replace by using the sealing packing.
Further, the central drill rod and rod extension rod central bore hole may allow for cooling of the drill bit and lubrication during drilling.
Drawings
FIG. 1 is a schematic view of the apparatus of the present invention;
FIG. 2 is a simplified diagram of the drilling process of the present invention, wherein (a) is tool installation, (b) is a drill pipe lowering, the drill pipe is fixed by a cross beam, (c) is a drill pipe connecting, and (d) is a drill pipe lowering repeatedly;
fig. 3 is a detailed view of the drilling process of the present invention, wherein (a) is tool installation, (b) is a drill pipe lowering, (c) is a cross beam fixed drill pipe, (d) is a lifting hydraulic cylinder, (e) is a drill pipe connecting, (f) is a fixed cross beam removed, (g) drill pipe lowering, and (h) drill pipe lifting.
Wherein, 1, the upright post is fixed with a nut; 2. a column; 3. a drill bit; 4. a centralizing sleeve; 5. a reducer union; 6. a central drill rod; 7. a V-shaped compression nut; 8. a V-shaped seal ring assembly; 9. sealing the packing; 10. an upright post extension bar; 11. the cross beam is not released; 12. lengthening a drill rod; 13. a motor beam; 14. a motor bracket; 15. a hydraulic motor; 16. a hydraulic cylinder; 17. connecting a spline; 18. a drill rod conversion shaft; 19. a bearing; 20. protecting a drill rod ring; 21. a column limit nut; 22. a lower righting cross beam; 23. a blowout prevention flange; 24. a hydraulic cylinder beam; 25. a cooling water injection port.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific embodiments:
referring to fig. 1, a pressurized drilling apparatus includes a blowout preventing flange assembly, a non-releasing cross beam 11, a hydraulic motor section, a center drill pipe section, left and right column sections. The blowout prevention flange part is provided with a blowout prevention flange 23, the blowout prevention flange part is fixed on a standby control valve of a valve to be operated through 8 stud bolts and nuts, a connecting surface is sealed through an octagonal gasket, the lower part of the standby control valve is connected to the valve to be drilled through a reducing joint 5, a channel is arranged on the blowout prevention flange 23 and used for installing a sensor and a deflation valve, the sensor is mainly used for measuring medium pressure or temperature parameters, the deflation valve is mainly used for medium discharge in the operation process, the center of the blowout prevention flange 23 is provided with an upper sealing groove and a lower sealing groove for installing V-shaped seals, an internal thread and a positioning table for fixing a sealing packing 9 are arranged on the sealing groove, and the sealing packing 9 is used for compressing a V-. The upper end of the blowout prevention flange 23 is provided with a lower centering beam 22 and a stand column limit nut 21, and the lower centering beam 22 is connected with the blowout prevention flange 23 through threads. The lower centering beam 22 consists of two male and female beams which are connected through a stud, 3 through holes are formed in the lower centering beam 22, the size of a central drill rod is matched with that of a middle through hole and used for penetrating through the central drill rod, the left and right through holes are used for installing the left and right stand columns 2, and the lower centering beam 22 is used for centering the blowout-preventing flange 23 and preventing the blowout-preventing flange 23 from rotating.
The non-releasing beam 11 comprises an upright post limiting nut, a stud bolt and a nut, the non-releasing beam is fixedly connected through the stud bolt and the nut, and a limiting hole is formed in the middle of the non-releasing beam and used for fixing the central drill rod and the non-releasing beam together. The stand limit nuts 21 are installed at the upper end and the lower end of the non-releasing cross beam 11, the non-releasing cross beam can be adjusted and fixed up and down, and the stand limit nuts 21 are connected with the stand column 2 through T-shaped threads.
The hydraulic motor assembly comprises a hydraulic motor 15, a motor cross beam 13, a motor support 14, a drill rod conversion shaft 18 and a connecting spline 17, wherein the motor cross beam 13 is provided with a cooling water injection port 25 (an annular gap is formed between the motor cross beam 13 and the drill rod conversion shaft 18 and is communicated with a drill rod extension rod and a central drill rod in a hollow mode), the motor support 14 is arranged on the motor cross beam 13 and used for fixing the hydraulic motor 15, a bearing 19 is arranged between the motor cross beam 13 and the drill rod conversion shaft 18, the motor support 14 is in threaded connection with the motor cross beam 13, and the motor support 14 is connected with the hydraulic motor 15 through a bolt. The center of the motor support 14 is provided with a drill rod conversion shaft 18 and a connecting spline 17 for connecting a hydraulic motor transmission shaft and a center drill rod, the center drill rod is connected with the drill rod conversion shaft through threads, and the connecting spline 17 is connected with the hydraulic motor transmission shaft and the drill rod conversion shaft 18.
The center drill rod subassembly includes center drill rod 6, drilling rod extension bar 12, drill bit 3, right set 4, drilling rod retaining ring 20, drilling rod extension bar 12 passes through threaded connection on drilling rod change-over spindle 18, center drill rod 6 passes through threaded connection with drilling rod extension bar 12, right set 4 and center drill rod 6 and pass through threaded connection, drill bit 3 and right set 4 and pass through threaded connection, be provided with the constant head tank on center drill rod 6 and the drilling rod extension bar 12, be used for connecting and not giving up crossbeam 11, install drilling rod retaining ring 20 on all the other constant head tanks, above-mentioned part center all is foraminiferous.
Control the stand subassembly and include stand fixation nut 1, stand 2, stand extension bar 10, pneumatic cylinder 16, pneumatic cylinder crossbeam 24, stand fixation nut 1 installs on treating the drilling valve, stand 2 is installed on stand fixation nut 1 through the screw thread, be equipped with T type screw thread on stand 2, stand extension bar 10 passes through the screw thread and installs on stand 2, pneumatic cylinder 16 passes through the bolt and installs on stand extension bar 10, pneumatic cylinder crossbeam 24 comprises two crossbeams of public mother, public mother's crossbeam passes through stud connection, there are 2 through-holes on the pneumatic cylinder crossbeam 24, control both ends through-hole and be used for the installation fixed hydraulic cylinder 16 about.
The hydraulic control console comprises an oil pump, an oil cylinder, a hydraulic motor, a manual pump, an electromagnetic valve, a display and the like. The hydraulic control system comprises a manual control system and an electric control system.
Referring to fig. 2-3, a method for implementing a pressurized drilling apparatus includes the following steps:
1) assembling the device: the left and right stand column assemblies are installed firstly, the stand column fixing nuts are installed on the valve fixing seats to be drilled, and the stand columns, the stand column extension rods, the hydraulic cylinders and the hydraulic cylinder cross beams are installed in sequence. And then installing a blowout prevention flange assembly, a hydraulic motor assembly, a central drill rod assembly and a hydraulic control console, and performing test operation.
2) Connecting the drill rod to the oil cylinder cross beam, and adjusting the drilling depth of the drill rod to ensure the centrality of drilling; all bolts are tightly taken, and a valve to be opened and closed is opened and closed according to the specification, so that the preparation work before drilling is completed;
3) testing the pressure of the device: the device carries out pressure test according to the test process requirements, and guarantees that the device has no leakage after being stabilized for 15min under rated pressure.
4) The process of connecting the central drill rod comprises the following steps: generally when connecing central drilling rod, the pneumatic cylinder is when the upper limit position, operation hydraulic control platform control pneumatic cylinder drives central drilling rod downstream, when treating the pneumatic cylinder lower limit position, the crossbeam is not abandoned in the installation, through not abandoning the crossbeam fixed center drilling rod, loosen the connection of drilling rod and drilling rod switching-over shaft, operation hydraulic control platform pushes up the pneumatic cylinder and makes the pneumatic cylinder be in the upper limit position, connect a demand length size's drilling rod extension bar again in the drilling rod upper end, accomplish the process that once only connects well core rod, so repeated messenger well core rod's drill bit reaches the position that needs work, otherwise, can dismantle drilling rod extension bar. Drilling operation can be carried out in the next step;
5) drilling: and a centering sleeve is arranged on the central drill rod, the hydraulic control console is operated to control the hydraulic cylinder to lower the drill rod, and meanwhile, the hydraulic control console is operated to control the hydraulic motor to rotate at a low speed until a drill bit of the central drill rod is lowered to a specified position. And continuously feeding and drilling, opening cooling water, operating the hydraulic control console, controlling the hydraulic motor to drive the central drill rod to axially rotate, observing the control pressure on the hydraulic control console, continuously operating the hydraulic control console to control the hydraulic cylinder to axially pressurize and drive the drill bit to feed, observing the control pressure on the hydraulic control console, and continuously checking the discharge condition of the iron filings in the filter in the drilling process. And repeating the drilling action, so that the drill bit is sequentially changed from small to large, and the drill bit is replaced according to requirements to complete final reaming.
6) Dismounting device: and (4) pulling out the central drill rod and the drill bit, closing the standby control valve, dismantling the drilling device and accessories and cleaning the working site.
The present invention will be described in further detail with reference to specific examples below:
taking the drilling of the gate valve flashboard of the double-barrelled Christmas tree No. 1 produced by the second petroleum machinery plant in the sea above as an example, the screw rod of the master control valve No. 1 at the well mouth is broken, the flat gate valve cannot be opened, the hole needs to be drilled under pressure, a new operation channel is established, and the oil pressure of the well mouth is 10 Mpa.
Firstly, preparation of construction
1. After a construction operation team is on site, a safety warning area is arranged according to requirements, and fire-fighting emergency equipment, a safety warning board, a wind vane and an escape route board are placed and fixed according to requirements. Personnel irrelevant to construction, site construction supervision and monitoring cannot enter a safety alert area. The staff handset must not be brought into the wellhead area. The drilling device is placed in order, and tools and equipment are checked.
2. The PPE is worn by field workers, and safety belts are needed to be equipped during high-altitude operation;
3. wellhead pressure was recorded and recorded.
4. And (4) carrying out field measurement to determine the length of a drill rod of the drilling tool and the depth position of a fault valve plate, and recording.
5. And the construction safety education is carried out on constructors.
Second, the operation process
1. Preparation work
And putting the drilling device with pressure and the matched equipment in order, and checking tools and equipment. Taking out the drilling device and the matched equipment, cleaning the drilling device and the matched equipment, wiring the hydraulic control cabinet, putting the drilling device and the matched equipment in order, and filling oil into the hydraulic control cabinet; and (4) completely closing the No. 4 gate valve and checking under the condition of no leakage, operating the gas production wellhead according to the gas production process flow, dismantling the upper part of the No. 4 gate valve of the gas production wellhead and placing the gate valve at a specified position.
2. Operating procedure of drilling
2.1 removing 2 pairs of bolts of the flange on the big four-way of the original well mouth, installing the fixed seat on the big four-way, then installing a pair of upright posts on the fixed seat, installing 31/2' EUE conversion flange on the upper end of the Christmas tree, installing the manual control valve on the conversion flange, connecting the blowout preventer with the control valve, connecting the upright posts and the blowout preventer together by using a lower centering beam, installing an oil cylinder cross beam, fixing double hydraulic cylinders on the two upright posts by the oil cylinder upper cross beam respectively, installing accessories such as a drill bit, a centering sleeve, a drill rod extension rod, a drill rod and the like, tightening all the bolts, and switching the valve to be switched according to the specification to complete the preparation work before drilling (the thickness of a drilling valve plate is 50 mm).
2.2 connecting the drill rod on the lower centralizing beam, and adjusting the drill rod to ensure the centering of the drill hole;
2.3 pressure test of the drilling device:
the drilling device carries out hydrostatic test according to the requirement, and ensures that the pressure of a wellhead is stabilized for 15min without leakage when the pressure of the wellhead is 21 MPa.
2.4 open the hydraulic control console, check the panel display data, check the hydraulic cylinder system and hydraulic motor system.
2.5 after drilling, opening a cooling system, driving a hydraulic motor to axially rotate by using a first booster pump, driving a hydraulic cylinder to control feeding by using a second booster pump, and continuously checking the discharge condition of chips in a filter in the drilling process, wherein the drilling is performed by using a phi 45mm drill bit with the depth of 45 +/-1 mm;
2.6 after the design depth is drilled, the drill rod is lifted out, the drill bit is changed to be phi 60mm, and the step 2.5 is repeated;
2.7, lifting the drill rod, and replacing the positioning drill bit with a drill bit special for drilling;
2.8 pressurizing in the axial direction, drilling through the gate plate, and ensuring that the total stroke of the drilling tool is enough to drill through the gate plate;
and 2.9, pulling out the reaming bit, closing the control valve, and removing the drilling tool to complete the drilling and reaming processes.
3. Wellsite recovery
The working site is cleaned, and special articles are treated according to relevant regulations, so that the environment pollution caused by wastes is prevented. And making a work record.
Claims (10)
1. The under-pressure drilling device is characterized by comprising a blowout prevention flange (23) fixed on a standby control valve of a valve to be operated, wherein a central drill rod (6) is inserted into the center of the blowout prevention flange (23), V-shaped seals for sealing the central drill rod (6) are arranged on the upper side and the lower side of the blowout prevention flange (23), the bottom of the central drill rod (6) is connected to a drill bit (3) through a centering sleeve (4), and the top of the central drill rod (6) is connected with a drill rod extension rod (12);
the upper part of the blowout prevention flange (23) is connected with a lower centering beam (22), the middle part of the lower centering beam (22) is inserted into a central drill rod (6), two ends of the lower centering beam are inserted with vertical columns (2), the bottom of each vertical column (2) is fixed on a fixing seat of a valve to be drilled, the central drill rod (6) is connected with a non-releasing beam (11), the non-releasing beam (11) is positioned on the upper side of the lower centering beam (22), the middle part of the non-releasing beam (11) is inserted into the central drill rod (6), two ends of the non-releasing beam are inserted into the vertical columns (2), and the top of each vertical column (2) is connected with;
the top of the upright post extension bar (10) is connected with a motor cross beam (13), two ends of the motor cross beam (13) are fixed with hydraulic cylinders (16), the middle of the motor cross beam is connected with a motor support (14), a hydraulic motor (15) is arranged on the motor support (14), the center of the motor support (14) is provided with a connecting spline (17) and a drill rod conversion shaft (18), an output shaft of the hydraulic motor (15) is connected to the drill rod conversion shaft (18) through the connecting spline (17), the lower part of the drill rod conversion shaft (18) penetrates through the center of the motor cross beam (13), and the bottom of the drill rod conversion shaft (18) is connected with the top of the drill rod extension bar (12);
the hydraulic cylinder (16) and the hydraulic motor (15) are controlled by a hydraulic control console.
2. The drilling device with pressure as claimed in claim 1, wherein the center of the blowout prevention flange (23) is provided with two sealing grooves for mounting the V-shaped seal, the sealing groove at the upper side is provided with the V-shaped sealing ring assembly (8), the V-shaped compression nut (7) and the sealing packing (9) from bottom to top in sequence, and the sealing groove at the lower side is provided with the V-shaped sealing ring assembly (8), the V-shaped compression nut (7) and the sealing packing (9) from top to bottom in sequence.
3. A pressurized drilling device according to claim 1, characterized in that the blowout prevention flange (23) is fixed on a standby control valve of a valve to be operated through 8 stud bolts and matched nuts, the connecting surface is sealed through an octagonal gasket, and a sensor for measuring medium pressure or temperature parameters and a deflation valve for discharging the medium in the operation process are installed on the blowout prevention flange (23).
4. The under-pressure drilling device according to claim 1, wherein the lower centering beam (22) consists of a male beam and a female beam, the male beam and the female beam are connected through a stud, the lower centering beam (22) is provided with 3 through holes, the size of the middle through hole is matched with that of the central drill rod (6) and used for penetrating through the central drill rod (6), the through holes at the left end and the right end are used for installing the left upright post and the right upright post (2), and the lower centering beam (22) is used for centering the blowout-preventing flange (23) and preventing the blowout-preventing flange (23) from rotating.
5. A live drilling device according to claim 1, wherein the lower centralizing beam (22) and the non-releasing beam (11) are both connected to the mast (2) by a mast stop nut (21); a bearing (19) is arranged between the motor cross beam (13) and the drill rod conversion shaft (18), the motor support (14) is in threaded connection with the motor cross beam (13), and the motor support (14) is connected with the hydraulic motor (15) through a bolt.
6. A pressurized drilling device according to claim 1, characterized in that the motor cross beam (13) is provided with a cooling water inlet (25) communicating with the drill rod extension rod (12) and the center of the central drill rod (6).
7. A drill under pressure device according to claim 1, wherein the drill rod extension rod (12) is threadedly connected to the drill rod change-over spindle (18), the central drill rod (6) is threadedly connected to the drill rod extension rod (12), the centering sleeve (4) is threadedly connected to the central drill rod (6), and the drill bit (3) is threadedly connected to the centering sleeve (4).
8. A drill press according to claim 1, wherein the central drill rod (6) and the drill rod extension rod (12) are each provided with a plurality of positioning slots, one of which is adapted to receive the non-releasing cross member (11) and the remaining of which is provided with a drill rod retaining ring (20).
9. A live drilling device according to claim 1, wherein a cylinder cross-member (24) is attached to the top of the cylinder (16).
10. A method for drilling under pressure by using the drilling device under pressure of claim 1, which is characterized by comprising the following steps:
the method comprises the following steps: performing a pressure test according to the test process requirements to ensure that the device has no leakage when stabilized at the rated pressure for more than 15 min;
step two: operating a hydraulic control console to control a hydraulic cylinder (16) to drive a central drill rod (6) to move downwards, installing a non-releasing cross beam (11) when the central drill rod (6) moves to the lower limit position of the hydraulic cylinder (16), fixing the central drill rod (6) through the non-releasing cross beam (11), then loosening the connection between the central drill rod (6) and a drill rod conversion shaft (18), operating the hydraulic control console to push the hydraulic cylinder (16) upwards to enable the hydraulic cylinder (16) to be located at the upper limit position, additionally connecting a drill rod extension rod (12) to the upper end of the central drill rod (6), and repeating the operation to enable a drill bit (3) of the central drill rod (6) to reach the position needing to work;
step three: the hydraulic control table is operated to control the hydraulic cylinder (16) to move downwards, meanwhile, the hydraulic control table is operated to control the hydraulic motor (15) to rotate at a low speed, after the drill bit (3) of the central drill rod (6) is lowered to a specified position, the drilling is continued to be fed, cooling water is turned on, the hydraulic control table is operated to control the hydraulic motor (15) to drive the central drill rod (6) to rotate axially, control pressure on the hydraulic control table is observed, the hydraulic control table is continuously operated to control the hydraulic cylinder (16) to pressurize axially to drive the drill bit to feed, control pressure on the hydraulic control table is observed, the discharge condition of scrap iron is continuously checked in the drilling process, the drilling action is repeated, the drill bit (3) is changed to become small and large in turn, and finally, the drill bit is changed according to;
step four: and taking out the central drill rod (6) and the drill bit (3), closing the standby control valve, dismantling the drilling device and accessories, and cleaning the working site.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010889791.3A CN111922387A (en) | 2020-08-28 | 2020-08-28 | Under-pressure drilling device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010889791.3A CN111922387A (en) | 2020-08-28 | 2020-08-28 | Under-pressure drilling device and method |
Publications (1)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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Cited By (2)
| 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 |
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