A drilling tool water hole emergency pressure relief pipeline system

Abstract

The present invention discloses an emergency pressure relief pipeline system for a drilling tool water hole, comprising a system body, the system body including: a discharge manifold, the inlet of the discharge manifold being connected to the drilling tool water hole; a regulating valve group, the inlet of the regulating valve group being connected to the outlet of the discharge manifold; a liquid-gas separator, the inlet of the liquid-gas separator being connected to the outlet of the regulating valve group, the gas outlet of the liquid-gas separator being connected to an exhaust pipeline, the liquid outlet of the liquid-gas separator being discharged to a preset processing station through a slurry discharge pipe, and the gas outlet of the liquid-gas separator being transported to a gas ignition station through an exhaust pipeline; when pressure is released, the opening of the regulating valve group ensures that the discharge flow rate entering the liquid-gas separator is lower than the maximum limit of the liquid-gas separator's processing flow rate. The present invention achieves gas-liquid separation through the liquid-gas separator, thereby achieving separate discharge of liquid and gas, and igniting the separated gas for treatment, thereby avoiding fires, leaks of harmful gases, or environmental incidents at the drilling site.

Description

Technical Field

[0001] The invention relates to the technical field of oil drilling engineering, in particular to a drilling tool water hole emergency pressure relief pipeline system. Background Art

[0002] Zhongtong's drill pipe, weighted drill pipe, stabilizer, drill collar, internal blowout preventer, screw downhole power drill and drill bit constitute the oil drilling tool. The combination of all the internal chambers of the drilling tool is collectively referred to as the "drill tool water hole".

[0003] A high compression ratio is a significant characteristic of gas. Natural gas is both flammable and explosive, and its associated gases, such as hydrogen sulfide, are highly toxic. This dictates the importance of well control during high-pressure gas well drilling, particularly the high risk of overflows and blowouts. When overflowing high-pressure gas invades the drill bit's waterhole and the drill bit's waterhole becomes blocked, emergency surface pressure relief at the drill bit's waterhole is a highly dangerous well control operation.

[0004] When high-pressure gas intrudes into the drill bit's waterhole during gas drilling and the drill bit's waterhole becomes clogged, it's necessary to urgently relieve the pressure in the drill bit's waterhole, remove the drill bit from a certain position, and connect the drill bit's waterhole and annulus for circulating well pressure relief. The typical emergency pressure relief method for the drill bit's waterhole is to connect the drill bit to a drainage pipeline at the rig floor and drain the fluid to a mud tank, a drainage pit, or a dedicated drainage pool. However, due to difficulties in controlling the amount of discharge, this method of discharging fluid into the mud tank contaminates the drilling fluid and increases drilling costs. The mixed liquid and gas directed to the drainage pit or drainage pool are prone to high-speed, long-range splashing, causing environmental pollution. The discharge pipeline is also prone to rupture and puncture due to vibration from gas pressure relief, causing environmental pollution and compromising drilling safety. In recent years, there have been numerous incidents of wellsite fires, drilling fluid contamination, and environmental pollution caused by drilling fluid falling to the ground during drill bit waterhole pressure relief operations.

[0005] Therefore, how to avoid fire, harmful gas leakage or environmental incidents at the drilling site and provide strong protection for natural gas drilling is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a drilling tool water hole emergency pressure relief pipeline system, which avoids fire, harmful gas leakage or environmental incidents at the drilling site and provides strong protection for natural gas drilling.

[0007] In order to achieve the above object, the present invention provides the following solutions:

[0008] A drilling tool water hole emergency pressure relief pipeline system includes a system body, wherein the system body includes a discharge manifold, a regulating valve group and a liquid-gas separator;

[0009] The inlet of the discharge manifold is used to communicate with the drilling tool water hole, the inlet of the regulating valve group is connected to the outlet of the discharge manifold, and the opening of the regulating valve group is adjustable; the inlet of the liquid-gas separator is connected to the outlet of the regulating valve group, the gas outlet of the liquid-gas separator is connected to the exhaust pipeline, the liquid outlet of the liquid-gas separator is discharged to the preset processing station through the slurry discharge pipe, and the gas outlet of the liquid-gas separator is transported to the gas ignition station through the exhaust pipeline;

[0010] When the pressure is released, the opening degree of the regulating valve group makes the discharge flow entering the liquid-gas separator lower than the maximum limit value of the processing flow of the liquid-gas separator.

[0011] In a specific embodiment, the system body further comprises a drilling fluid processing system, the drilling fluid processing system is arranged at a preset processing station, and the inlet of the drilling fluid processing system is connected to the liquid outlet of the liquid-gas separator;

[0012] and / or

[0013] The system body further includes an ignition device, which is disposed at the gas ignition station and is used to ignite the gas exhausted at the outlet of the exhaust pipeline.

[0014] In another specific embodiment, the drilling fluid treatment system includes a vibrating screen, a desilter, a desander, and a degasser, wherein the inlet of the vibrating screen is connected to the liquid outlet of the liquid-gas separator through the slurry discharge pipe, the outlet of the vibrating screen is connected to the inlet of the desilter, the outlet of the desilter is connected to the inlet of the desander, and the outlet of the desander is connected to the inlet of the degasser;

[0015] and / or

[0016] The drainage manifold is arranged close to the drilling platform and the derrick.

[0017] In another specific embodiment, the system body further comprises a six-port pressure relief valve and a stopcock valve;

[0018] The drainage manifold includes a joint, a plunger valve, an elbow and a connecting pipe;

[0019] One end of the plug valve is connected to the drilling tool water hole, and the other end of the plug valve is connected to one end of the plunger valve through a joint;

[0020] The number of the elbow and the connecting pipe is at least one, and the other end of the plunger valve is connected to one end of the six-way pressure relief valve through the elbow and the connecting pipe;

[0021] The other end of the six-way pressure relief valve is communicated with the regulating valve group.

[0022] In another specific embodiment, the pressure relief six-way valve comprises a six-way body, a first side interface and a bottom flange.

[0023] A channel is formed in the six-way body, and the first side interface and the bottom flange are respectively connected to the two ends of the channel, and are used to connect the outlet of the drain manifold and the inlet of the regulating valve group respectively;

[0024] The elbow comprises an elbow body,

[0025] The elbow body is vertically connected to a first connecting pipe and a second connecting pipe, and the first end of the first connecting pipe is used for liquid inlet, and the first end of the second connecting pipe is used for liquid discharge.

[0026] A communicating hole communicating with the second end of the second communicating tube is provided on the side wall of the first communicating tube. The second end of the first communicating tube is closed, and a concave anti-flushing pad area is formed at the second end of the first communicating tube.

[0027] In another specific embodiment, the pressure relief six-way valve further includes a second side interface and a third side interface both provided on the six-way valve body, wherein the second side interface and the third side interface are both communicated with the duct;

[0028] The second side interface and the third side interface are respectively detachably connected to blind flanges for sealing the second side interface and the third side interface;

[0029] The flanges configured at the first side interface, the second side interface and the third side interface are interchangeable;

[0030] The main body is also provided with a pressure sensor connection hole connected to the hole for installing a pressure sensor;

[0031] and / or

[0032] The main body is also provided with a pressure gauge hole connected to the hole for installing a pressure gauge;

[0033] The inner wall of the first connecting pipe is provided with a mark, and the mark is an arrow along the direction of liquid flow;

[0034] and / or

[0035] The elbow further includes a male union and a female union, one of the male union and the female union is installed at the first end of the first connecting pipe, and the other is installed at the first end of the second connecting pipe.

[0036] In another embodiment, the system body further comprises slips;

[0037] The slips are fixed on the connecting pipe, and the slips are fixed on the anti-fall-off safety rope.

[0038] In another specific embodiment, the slips include a main slip body, a secondary slip body, a first locking member and a second locking member;

[0039] The main slip body and the auxiliary slip body are respectively clamped on both sides of the connecting pipe and fixed together by the first locking member;

[0040] The main slip body is provided with a rope groove for allowing the anti-falling safety rope to pass through, and the second locking member blocks the exit of the rope groove to confine the anti-falling safety rope in the rope groove.

[0041] In another specific embodiment, the regulating valve group includes a flat valve, a throttle manifold, a throttle valve and a blowdown line;

[0042] The inlet of the flat valve is communicated with the outlet of the drain manifold, the outlet of the flat valve is communicated with the inlet of the throttle valve through the throttle manifold, and the outlet of the throttle valve is communicated with the inlet of the liquid-gas separator through the blowdown line.

[0043] In another specific embodiment, the drilling tool water hole emergency pressure relief pipeline system further includes a transport skid;

[0044] The transport skid is provided with fixing brackets for fixing various components of the system body;

[0045] The transport skid is provided with a protective cover for protecting the system body;

[0046] The transport skid is provided with rope lifting lugs and / or is provided with forklift supporting holes.

[0047] The various embodiments according to the present invention can be arbitrarily combined as needed. The embodiments obtained after these combinations are also within the scope of the present invention and are part of the specific implementation methods of the present invention.

[0048] Without being limited to any theory, it can be seen from the above disclosure that the drill water hole emergency pressure relief pipeline system provided by the present invention, when in use, connects the inlet of the discharge manifold to the drill water hole; then, slightly opens the regulating valve group for low-flow pressure relief; then, adjusts the opening of the regulating valve group so that the discharge flow entering the liquid-gas separator is lower than the maximum limit value of the liquid-gas separator's processing flow to perform pressure relief operations, achieves gas-liquid separation through the liquid-gas separator, and then realizes the separate discharge of liquid and gas, and ignites the separated gas for treatment, thereby avoiding fire, harmful gas leakage or environmental incidents at the drilling site, and providing strong protection for natural gas drilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0050] Figure 1 This is a structural diagram of the drilling tool water hole emergency pressure relief pipeline system provided by the present invention;

[0051] Figure 2 A schematic diagram of the process structure of the drilling tool water hole emergency pressure relief pipeline system provided by the present invention;

[0052] Figure 3 A schematic cross-sectional view of the elbow provided by the present invention;

[0053] Figure 4 This is a schematic diagram of the main structure of the elbow provided by the present invention;

[0054] Figure 5 A schematic structural diagram of the six-way pressure relief valve provided by the present invention;

[0055] Figure 6 A schematic cross-sectional view of the six-way pressure relief valve provided by the present invention;

[0056] Figure 7 This is a schematic diagram of the main structure of the slip provided by the present invention;

[0057] Figure 8 This is a schematic structural diagram of the transport skid provided by the present invention.

[0058] in, Figures 1-8 middle:

[0059] Plug valve 1, joint 2, plunger valve 3, elbow 4, connecting pipe 5, six-way pressure relief 6, flat valve 7, throttle manifold 8, throttle valve 9, blowdown line 10, liquid-gas separator 11, exhaust line 12, ignition port 13, slurry discharge pipe 14, slip 15, main slip body 1501, auxiliary slip body 1502, second locking member 1503, rope groove 1504, gasket 1505, elbow body 401, first connecting pipe 40 2. Second connecting pipe 403, male union 404, female union 405, liquid-proof pad area 406, mark 407, six-way body 601, pressure sensor connection hole 602, pressure gauge hole 603, first side interface 604, second side interface 605, third side interface 606, channel 607, bottom flange 608, transport skid 16, lifting lug 1601, forklift support hole 1602, fixing bracket 1603. DETAILED DESCRIPTION

[0060] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention, in conjunction with the accompanying drawings. The present invention can be implemented in a variety of different forms and is not limited to the implementation methods described in this embodiment. The purpose of providing the following specific implementation methods is to facilitate a clearer and more thorough understanding of the disclosure of the present invention. The words "below" and "below" indicating directions refer only to the position of the structure shown in the corresponding drawings.

[0061] It will be understood that the terms used herein are intended only to describe specific embodiments and are not intended to limit the present invention. When used herein, the singular forms "a" and "an" are intended to include the plural forms, unless the context clearly indicates otherwise. Furthermore, when used in this specification, the terms "include" and / or "comprise" indicate the presence of features, wholes, steps, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, elements, components and / or combinations thereof. The subsequent description of the specification is for the purpose of implementing the preferred embodiment of the present invention, but the description is for the purpose of illustrating the general principles of the present invention and is not intended to limit the scope of the present invention. The scope of protection of the present invention shall be as defined in the appended claims.

[0062] like Figure 1 As shown, the present invention discloses a drilling tool water hole emergency pressure relief pipeline system, which avoids fire, harmful gas leakage or environmental incidents at the drilling site, and provides strong protection for natural gas drilling.

[0063] The drilling tool water hole emergency pressure relief pipeline system includes a system body, specifically, the system body includes a discharge manifold, a regulating valve group and a liquid-gas separator 11.

[0064] The inlet of the discharge manifold is used to communicate with the water hole of the drilling tool, the inlet of the regulating valve group is connected with the outlet of the discharge manifold, and the opening of the regulating valve group is adjustable.

[0065] The inlet of the gas-liquid separator 11 is connected to the outlet of the regulating valve assembly, and the gas outlet of the gas-liquid separator 11 is connected to the exhaust line 12. The liquid outlet of the gas-liquid separator 11 is discharged through the slurry discharge pipe 14 to a predetermined processing station for slurry treatment. The gas outlet of the gas-liquid separator 11 is transported through the exhaust line 12 to the gas ignition station for combustion treatment, preventing direct gas discharge into the atmosphere and polluting the environment. The gas-liquid separator 11 ensures that the gas at the gas outlet is pure and liquid-free, and can be fully burned.

[0066] When the pressure is released, the opening of the regulating valve group is adjusted so that the discharge flow entering the liquid-gas separator 11 is lower than the maximum limit of the processing flow of the liquid-gas separator 11 to prevent explosion.

[0067] The drill bit water hole emergency pressure relief pipeline system provided by the present invention, when in use, connects the inlet of the discharge manifold to the drill bit water hole; then, slightly opens the regulating valve group for low flow pressure relief; then, adjusts the opening of the regulating valve group so that the discharge flow entering the liquid-gas separator 11 is lower than the maximum limit value of the processing flow of the liquid-gas separator 11 to perform pressure relief operation, and realizes gas-liquid separation through the liquid-gas separator 11, thereby realizing the separate discharge of liquid and gas, and igniting the separated gas for treatment, thereby avoiding fire, leakage of harmful gas or environmental incidents at the drilling site, and providing strong protection for natural gas drilling.

[0068] In some embodiments, the system body also includes a drilling fluid treatment system, which is arranged at a preset treatment station, and the inlet of the drilling fluid treatment system is connected to the liquid outlet of the liquid-gas separator 11. After the drilling fluid is purified by the drilling fluid treatment system, it can be recycled again.

[0069] Furthermore, the present invention specifically discloses a drilling fluid treatment system including a vibrating screen, a desilter, a desander and a degasser.

[0070] The inlet of the vibrating screen is connected to the liquid outlet of the liquid-gas separator 11 through a slurry discharge pipe 14, which is used to separate the muddy water and impurities in the slurry to a certain extent.

[0071] The outlet of the vibrating screen is connected to the inlet of the desilter, that is, the mud and water separated by the vibrating screen enter the desilter for separation of mud and water.

[0072] The outlet of the desilter is connected to the inlet of the desander, that is, the water separated by the desilter enters the desander for desandering.

[0073] The outlet of the desander is connected to the inlet of the degasser, that is, the water treated by the desander is degassed in the degasser, and finally, the obtained water is recycled as drilling fluid.

[0074] In some embodiments, the present invention discloses that the system body further includes an ignition device, which is disposed at a gas ignition station and is used to ignite the gas exhausted from the outlet of the exhaust line 12 .

[0075] Specifically, the ignition device is a torch.

[0076] In some embodiments, the drainage manifold is arranged close to the drilling platform and the derrick, with the shortest stroke, quick installation and easy fixation.

[0077] Furthermore, the present invention discloses that the system body also includes a six-way pressure relief valve 6 and a plug valve 1, and the discharge manifold includes a joint 2, a plunger valve 3, an elbow 4 and a connecting pipe 5.

[0078] One end of the plug valve 1 is connected to the water hole of the drilling tool, and the other end of the plug valve 1 is connected to one end of the plunger valve 3 through the joint 2.

[0079] The number of the elbow 4 and the connecting pipe 5 is at least one, and the other end of the plunger valve 3 is connected to one end of the six-way pressure relief valve 6 through the elbow 4 and the connecting pipe 5 .

[0080] The other end of the pressure relief six-way valve 6 is communicated with the regulating valve group.

[0081] Furthermore, the present invention discloses that connector 2 is a composite connector, having a male union at one end and a drill pipe male connector at the other for connecting drill pipe. The composite connector is configured with multiple integral connectors, all of which have a male union at one end for connecting to a plunger-type swing valve; the other end features different drill pipe male connectors manufactured in accordance with GBT22512.2, "Rotary Drilling Equipment for the Petroleum and Natural Gas Industry - Part 2: Machining and Measurement of Spiral Shouldered Threaded Connections." These connectors are available in sizes and shapes, including NC50, NC46, NC38, and 5-1 / 2" FH, to accommodate various drill tool configurations required at well sites.

[0082] Furthermore, the present invention discloses that the composite joint is also configured with a union joint and a union blank joint. When the drilling tool buckle shape that is not in the GBT22512.2 standard is used at the drilling site, the applicable blank joint can be processed according to the on-site drilling tool buckle shape and used.

[0083] In some embodiments, the plunger valve 3 is a plunger-type swing valve, and both ends of the plunger-type swing valve are unions.

[0084] Furthermore, the present invention discloses a plunger-type swing valve which is a special valve for ground manifolds for fracturing and cementing, and is used as an on-off valve in emergency pressure relief operations of drilling tools and water holes. Compared with the drill tool plug valve configured with a drilling tool assembly in the prior art, since the drill tool plug valve works under the condition of entering the wellbore and rotating with the drill string, its outer diameter, inner diameter, and sealing mechanism setting are all restricted, and the sealing area of ​​the valve core and valve seat is also restricted, resulting in low reliability in use. The plunger-type swing valve used in the present invention is not restricted by the outer diameter, and the valve core and valve seat have large volumes, a large sealing contact area, and a reasonable sealing mechanism setting. Its sealing effect and service life are much higher than those of the drill tool plug valve.

[0085] In some embodiments, the connecting pipe 5 is a high-pressure composite steel pipe of different lengths with unions at both ends. The present invention preferably uses standard ground high-pressure composite steel pipes for petroleum fracturing and cementing operations for connection, which not only enables rapid on-site assembly and disassembly, but also avoids defects such as the hose's inability to withstand erosion and easy shaking and damage due to pressure fluctuations. Specifically, the present invention is equipped with six different lengths of high-pressure composite steel pipes of 0.25m, 0.5m, 1m, 2m, 3m, and 4m, and there are multiple of each. When there are different spacings and height differences between the water holes of the drilling tools and the pressure relief valves 6 in different well sites, the requirements for adjusting the length and turning position of the drainage pipeline can be met by changing the combination of high-pressure composite steel pipes of different lengths, thereby achieving the design purpose of being able to quickly and smoothly connect the drilling tools and the pressure relief valves 6, and abandoning the previous practice of using flexible elbows with low reliability to adjust the turning position.

[0086] In some embodiments, the elbow 4 is a right-angle compound elbow with unions at both ends. Further, the elbow 4 is a target-type right-angle compound elbow.

[0087] Furthermore, if Figure 3 and Figure 4 As shown, the present invention specifically discloses that the elbow 4 includes an elbow body 401, a first connecting pipe 402 and a second connecting pipe 403 vertically connected to the elbow body 401, and the first end of the first connecting pipe 402 is used for liquid intake, and the first end of the second connecting pipe 403 is used for liquid discharge.

[0088] A communication hole is defined on the side wall of the first communication tube 402 , communicating with the second end of the second communication tube 403 . The second end of the first communication tube 402 is sealed, and a recessed anti-flushing pad area 406 is formed at the second end of the first communication tube 402 .

[0089] Specifically, the first connecting pipe 402 and the second connecting pipe 403 are arranged vertically, that is, the elbow body 401 is similar to a three-way inner channel 607 with a straight-through end face blocked. When in use, some flowing medium is accumulated in the anti-flushing pad area 406, which can greatly improve the anti-erosion performance of the elbow 4 and ensure the reliability of the pipeline.

[0090] Furthermore, a mark 407 is provided on the inner wall of the first connecting pipe 402 to facilitate the connection of the inlet and outlet of the elbow 4 with other components.

[0091] In some embodiments, mark 407 is an arrow along the direction of liquid flow. Specifically, mark 407 is a liquid flow direction arrow milled on the inner wall of the first connecting tube 402 and painted in a warning yellow color that is different from the elbow 4 to avoid incorrect connection of the inlet and outlet end faces, which causes the elbow 4 to lose the liquid cushion anti-erosion function. The milling process and yellow color ensure that mark 407 is both eye-catching and not easy to be damaged or lost.

[0092] It should be noted that the mark 407 is not limited to being an arrow, but may also be other marks such as text.

[0093] The union on the elbow 4 includes a male union 404 and a female union 405 , one of the male union 404 and the female union 405 is installed at the first end of the first connecting pipe 402 , and the other is installed at the first end of the second connecting pipe 403 .

[0094] Furthermore, the unions of the composite joint, plunger-type swing valve, high-pressure composite steel pipe and composite elbow 4 disclosed in the present invention are all integrated with the body or pipe body, and there is no connecting thread between the union and the body or pipe body, which is not only strong but also resistant to vibration and loosening.

[0095] In some embodiments, the present invention discloses that the system body further includes slips 15 , which are fixed on the connecting pipe 5 , and the slips 15 are fixed on the anti-fall-off safety rope.

[0096] Furthermore, if Figure 7 As shown, the present invention discloses that the slip 15 includes a main slip body 1501 , an auxiliary slip body 1502 , a first locking member and a second locking member 1503 .

[0097] The main slip body 1501 and the auxiliary slip body 1502 are respectively clamped on either side of the connecting pipe 5 and fixed together by a first locking member. The main slip body 1501 is provided with a rope groove 1504 for allowing the safety rope to escape. The second locking member 1503 blocks the exit of the rope groove 1504, thereby confining the safety rope to the rope groove 1504.

[0098] The provision of the slips 15 improves the connection strength of the connecting pipe 5, fixes the drain manifold, and prevents the free joint of the drain manifold from loosening and from being damaged by vibration or pulsation.

[0099] Specifically, the main slip body 1501 and the auxiliary slip body 1502 are both semicircular and fixed together by bolts.

[0100] In order to reduce the weight of the slips 15, the present invention discloses that both the main slip body 1501 and the auxiliary slip body 1502 are provided with weight-reducing grooves.

[0101] In order to further reduce weight, the present invention discloses that grooves and / or corrugations are provided on the main slip body 1501 and the auxiliary slip body 1502 to facilitate on-site workers to take, place or carry when disassembling or assembling.

[0102] Furthermore, the present invention discloses that the slips 15 also include liners 1505 , which are respectively fixed on the clamping surfaces of the main slip body 1501 and the auxiliary slip body 1502 for clamping the connecting pipe 5 .

[0103] In some embodiments, one of the liner 1505 and the clamping surface is provided with a slot, and the other is provided with a protrusion that engages with the slot, so as to facilitate the connection between the liner 1505 and the clamping surface.

[0104] In order to improve the versatility of the liner 1505, the present invention discloses that the liner 1505 on the main slip body 1501 and the liner 1505 on the auxiliary slip body 1502 can be interchanged.

[0105] The liner 1505 is made of polyurethane and is easy to replace after being worn. It should be noted that the liner 1505 is made of polyurethane in only one embodiment of the present invention. In actual application, the liner 1505 can also be made of other wear-resistant materials.

[0106] Specifically, the present invention discloses that the first locking member is a fastening bolt, and the second locking member 1503 is a locking pin.

[0107] In some embodiments, as Figure 5 and Figure 6 As shown, the pressure relief six-way valve 6 includes a six-way body 601, a first side interface 604 and a bottom flange 608. A channel 607 is opened in the six-way body 601. The first side interface 604 and the bottom flange 608 are respectively connected to the two ends of the channel 607, and are respectively used to connect the outlet of the discharge manifold and the inlet of the regulating valve group.

[0108] Specifically, there are five six-way pressure relief valves 6, each differing only in the bottom flange 608. These replace the original instrument flanges of different specifications for throttle manifolds configured at various locations. The flanges at the bottom of each of the five six-way pressure relief valves 6, where they assemble with the throttle manifold 8, are manufactured in accordance with GB / T22513. The flanges are modeled as F52-35, F52-70, F52-105, and F65-70, F65-105, respectively. The remaining pressure rating is 105 MPa, and the technical dimensions are identical.

[0109] It can be understood that setting the number of the six pressure relief ports 6 to five is only a specific embodiment of the present invention. In actual applications, the number of the six pressure relief ports 6 can also be increased or decreased as needed.

[0110] Furthermore, the present invention discloses a pressure sensor connection hole 602 formed on the main body and connected to the channel 607 for mounting a pressure sensor. Specifically, the pressure sensor through-hole is located on the top surface of the pressure relief valve 6 and is identical to the interface of a conventional instrument flange pneumatic pressure sensor, enabling quick assembly and disassembly of the pressure sensor.

[0111] The main body is also provided with a pressure gauge hole 603 connected to the channel 607 for installing a pressure gauge. Specifically, the pressure gauge hole 603 is a pressure gauge interface opened on the top surface of the pressure relief six-way 6 to achieve rapid disassembly and assembly of the pressure gauge.

[0112] Furthermore, the present invention discloses that the pressure relief valve 6 also includes a second side interface 605 and a third side interface 606 both provided on the valve body 601 , and both the second side interface 605 and the third side interface 606 are connected to the channel 607 in the pressure relief valve 6 .

[0113] Blind flanges are detachably connected to the second side interface 605 and the third side interface 606 , respectively, for sealing the second side interface 605 and the third side interface 606 .

[0114] Specifically, the first side interface 604 is configured as a composite flange composed of a female union and a flange, which is forged in one piece and used to connect the connecting pipe 5. It has high strength when in use and is resistant to vibration and loosening.

[0115] Second-side interface 605 is configured as a blind flange with a needle shutoff valve, used for pre-commissioning pressure testing of the installed drain manifold and dedicated instrument flange. This blind flange with a needle shutoff valve can also be used to relieve pressure within the pressure relief manifold assembly or drain fluid from the six-port pressure relief valve when the manifold is out of service or in standby mode.

[0116] The third access port is configured with a blind flange, which is routinely used to block the pipeline. When pressure relief operations are suspended in winter, the blind flange can be removed to quickly drain the fluid accumulated from the drill floor to the choke manifold 8, preventing it from freezing. After the drill waterhole emergency pressure relief system is activated, the blind flange can also be removed to clean the drain channel 607 when it is temporarily suspended or put into standby mode.

[0117] Furthermore, the present invention discloses that the flanges configured at the first side interface 604, the second side interface 605 and the third side interface 606 are interchangeable, thereby improving the versatility of the pressure relief six-way valve 6. In addition, the direction in which the discharge manifold is connected to the throttling manifold 8 can be adjusted according to on-site needs, and the orientation of the pressure gauge can be adjusted.

[0118] In some embodiments, the regulating valve group includes a flat valve 7, a throttle manifold 8, a throttle valve 9 and a blowdown line 10. The inlet of the flat valve 7 is connected to the outlet of the discharge manifold, the outlet of the flat valve 7 is connected to the inlet of the throttle valve 9 through the throttle manifold 8, and the outlet of the throttle valve 9 is connected to the inlet of the liquid-gas separator 11 through the blowdown line 10.

[0119] Specifically, the present invention discloses that there are at least two throttle valves 9, which serve as emergency backup valves for each other.

[0120] When the drill water hole emergency pressure relief pipeline system provided by the present invention is pressure tested to verify whether the connection is reliable, it is necessary to close the plug valve 1 on the top of the drill assembly and the flat valve 7 below the six-way pressure relief valve 6.

[0121] In some embodiments, the drilling tool water hole emergency pressure relief pipeline system also includes a transport skid 16, on which are respectively provided fixing brackets 1603 for fixing various components of the system body, so that the system body is not easily damaged by collision due to loosening of various components during transportation.

[0122] Furthermore, the present invention discloses that a protective cover is provided on the transport skid 16 to form a box body with the transport skid 16 for protecting the system body.

[0123] Furthermore, if Figure 8 As shown, the present invention discloses that the transport skid 16 is provided with a rope lifting lug 1601 and / or a forklift support hole 1602, which makes transportation and loading and unloading more convenient. When the muddy road on site is inconvenient for construction machinery to operate, it can be towed to a position convenient for lifting operations.

[0124] The drill water hole emergency pressure relief pipeline system provided by the present invention, when in use, guides the high-pressure gas or gas-liquid mixed fluid invading the drill water hole through the discharge manifold and the pressure relief six-way 6 to the conventional well control throttle manifold 8 configured on site, so that the gas or gas-liquid mixed fluid is pressure-relieved and sprayed according to the process of: drill water hole → plug valve 1 → discharge manifold → pressure relief six-way 6 → throttle manifold 8 → blowout pipeline 10 → liquid-gas separator 11, and the separated gas is discharged and ignited and burned according to the process of: liquid-gas separator 11 → exhaust pipeline 12 → ignition port 13; the solid-liquid mixed fluid of the separated gas is purified according to the purification process of: liquid-gas separator 11 → slurry discharge pipe 14 line → vibrating screen → drilling fluid tank → desander → degasser, and then recycled for use. Figure 2 As shown. When the present invention is applied at an unspecified drilling site, only the drain manifold and pressure relief valve 6 designed and matched according to the present invention need to be configured. All other equipment utilizes conventional well control devices that have been installed and debugged to a satisfactory level. Before depressurizing the drill hole, the throttle manifold 8's original three-way instrument flange is replaced with the pressure relief valve 6. From the drill floor's flat tool joint 2, close to the drill floor and derrick, connect the drain manifold to the newly replaced dedicated pressure relief valve 6 and securely secure it with slips 15 and ropes.

[0125] After the pipeline is installed and tightened, close the plug valve 1 on the top of the drill tool assembly; close the flat valve 7 below the dedicated pressure relief valve 6, and connect the needle stop valve equipped with the flange on the second side interface 605 of the self-relief valve 6 to the pressure test pipeline. Test the pressure to the rated pressure of the well control devices such as the choke manifold 8 originally configured on site. According to the pressure test requirements of the well control device in the "Drilling Engineering Design", if the pressure stabilization time and pressure drop meet the standards, the installation is considered qualified and the pressure relief operation can be carried out.

[0126] During pressure relief, first slightly open the throttle valve 9 to release pressure at a low flow rate. Then, adjust the opening of the throttle valve 9 so that the discharge flow rate is lower than the gas processing capacity of the liquid-gas separator 11, and then perform the pressure relief operation to ensure that the gas at the outlet is pure and liquid-free and can be fully burned. During pressure relief, observe the solid content of the fluid discharged from the separator in the pool in front of the vibrating screen in the drilling fluid circulation system. If necessary, activate the vibrating screen, desilter, desander, and degasser to ensure that the drilling fluid discharged after pressure relief can be recycled.

[0127] When unconventional reverse circulation well killing operations are required on site, the present invention can be used as a reverse circulation well killing manifold without configuring any other components.

[0128] It should be noted that relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0129] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to the embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is to be construed in the widest manner consistent with the principles and inventive features disclosed herein.

[0130] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A drilling tool water hole emergency pressure relief pipeline system, characterized in that: The system comprises a main body, wherein the main body comprises a discharge manifold, a regulating valve group and a liquid-gas separator; The inlet of the discharge manifold is used to communicate with the drilling tool water hole, the inlet of the regulating valve group is connected to the outlet of the discharge manifold, and the opening of the regulating valve group is adjustable; the inlet of the liquid-gas separator is connected to the outlet of the regulating valve group, the gas outlet of the liquid-gas separator is connected to the exhaust pipeline, the liquid outlet of the liquid-gas separator is discharged to the preset processing station through the slurry discharge pipe, and the gas outlet of the liquid-gas separator is transported to the gas ignition station through the exhaust pipeline; When the pressure is released, the opening of the regulating valve group makes the discharge flow entering the liquid-gas separator lower than the maximum limit value of the processing flow of the liquid-gas separator; The system body also includes a drilling fluid treatment system, which is arranged at a preset treatment station, and the inlet of the drilling fluid treatment system is connected to the liquid outlet of the liquid-gas separator; the system body also includes an ignition device, which is arranged at the gas ignition station and is used to ignite the gas discharged from the outlet of the exhaust pipeline; The system body also includes a six-way pressure relief valve and a plug valve; The drain manifold includes a joint, a plunger valve, an elbow and a connecting pipe; one end of the plug valve is connected to the water hole of the drilling tool, and the other end of the plug valve is connected to one end of the plunger valve through a joint; the number of the elbow and the connecting pipe is at least one, and the other end of the plunger valve is connected to one end of the six-way pressure relief valve through the elbow and the connecting pipe; the other end of the six-way pressure relief valve is connected to the regulating valve group; The pressure relief six-way valve comprises a six-way body, a first side interface and a bottom flange. A channel is formed in the six-way body. The first side interface and the bottom flange are respectively connected to the two ends of the channel and are respectively used to connect the outlet of the discharge manifold and the inlet of the regulating valve group; The elbow includes an elbow body, a first communicating tube and a second communicating tube vertically connected to each other, wherein a first end of the first communicating tube is used for liquid inlet, and a first end of the second communicating tube is used for liquid discharge, a communicating hole is defined on a side wall of the first communicating tube and communicates with a second end of the second communicating tube, the second end of the first communicating tube is closed, and a recessed anti-flushing pad area is formed at the second end of the first communicating tube; The pressure relief six-way valve further includes a second side interface and a third side interface, both of which are provided on the six-way valve body, and the second side interface and the third side interface are both in communication with the channel; the second side interface and the third side interface are respectively detachably connected to blind flanges for sealing the second side interface and the third side interface; the flanges configured at the first side interface, the second side interface and the third side interface are interchangeable; The main body is also provided with a pressure sensor connection hole connected to the hole for installing a pressure sensor; The main body is also provided with a pressure gauge hole connected to the hole for installing a pressure gauge; The inner wall of the first connecting pipe is provided with a mark, and the mark is an arrow along the direction of liquid flow; The elbow further includes a male union and a female union, one of the male union and the female union is installed at the first end of the first connecting pipe, and the other is installed at the first end of the second connecting pipe.

2. The drilling tool water hole emergency pressure relief pipeline system according to claim 1, characterized in that: The drilling fluid processing system includes a vibrating screen, a desilter, a desander, and a degasser. The inlet of the vibrating screen is connected to the liquid outlet of the liquid-gas separator through the slurry discharge pipe. The outlet of the vibrating screen is connected to the inlet of the desilter. The outlet of the desilter is connected to the inlet of the desander. The outlet of the desander is connected to the inlet of the degasser. and / or The drainage manifold is arranged close to the drilling platform and the derrick.

3. The drilling tool water hole emergency pressure relief pipeline system according to claim 1, characterized in that: The system body also includes slips; The slips are fixed on the connecting pipe, and the slips are fixed on the anti-fall-off safety rope.

4. The drilling tool water hole emergency pressure relief pipeline system according to claim 3, characterized in that: The slips include a main slip body, an auxiliary slip body, a first locking member and a second locking member; The main slip body and the auxiliary slip body are respectively clamped on both sides of the connecting pipe and fixed together by the first locking member; The main slip body is provided with a rope groove for allowing the anti-falling safety rope to pass through, and the second locking member blocks the exit of the rope groove to confine the anti-falling safety rope in the rope groove.

5. The drilling tool water hole emergency pressure relief pipeline system according to claim 1, characterized in that: The regulating valve group includes a flat valve, a throttle manifold, a throttle valve and a blowdown pipe line; The inlet of the flat valve is communicated with the outlet of the drain manifold, the outlet of the flat valve is communicated with the inlet of the throttle valve through the throttle manifold, and the outlet of the throttle valve is communicated with the inlet of the liquid-gas separator through the blowdown line.

6. The drilling tool water hole emergency pressure relief pipeline system according to any one of claims 1 to 5, characterized in that: Also includes transport skid; The transport skid is provided with fixing brackets for fixing various components of the system body; The transport skid is provided with a protective cover for protecting the system body; The transport skid is provided with rope lifting lugs and / or is provided with forklift supporting holes.

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