CN111022016A - Hydraulic fracturing and production wellhead device and using method thereof - Google Patents

Hydraulic fracturing and production wellhead device and using method thereof Download PDF

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Publication number
CN111022016A
CN111022016A CN201911158609.0A CN201911158609A CN111022016A CN 111022016 A CN111022016 A CN 111022016A CN 201911158609 A CN201911158609 A CN 201911158609A CN 111022016 A CN111022016 A CN 111022016A
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CN
China
Prior art keywords
valve
port
way
hydraulic
oil pipe
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911158609.0A
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Chinese (zh)
Inventor
庞德新
申玉壮
高亮
王海涛
周汉鹏
秦利军
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Xinjiang Petroleum Administration Co ltd
China National Petroleum Corp
Original Assignee
Xinjiang Petroleum Administration Co ltd
China National Petroleum Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by Xinjiang Petroleum Administration Co ltd, China National Petroleum Corp filed Critical Xinjiang Petroleum Administration Co ltd
Priority to CN201911158609.0A priority Critical patent/CN111022016A/en
Publication of CN111022016A publication Critical patent/CN111022016A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods for stimulating production by forming crevices or fractures
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/02Surface sealing or packing
    • E21B33/03Well heads; Setting-up thereof
    • E21B33/04Casing heads; Suspending casings or tubings in well heads
    • E21B33/047Casing heads; Suspending casings or tubings in well heads for plural tubing strings
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B34/00Valve arrangements for boreholes or wells
    • E21B34/02Valve arrangements for boreholes or wells in well heads

Abstract

The invention relates to the technical field of oil extraction well heads, in particular to a hydraulic fracturing and production well head device and a using method thereof. According to the invention, after the four-way pipe head and the master control gate valve are integrated, the requirement of fracturing operation can be realized, meanwhile, the pressure control can be carried out on the casing pipe channel, and the Christmas tree installation operation can be completed under the condition of controllable casing pressure by controlling the opening and closing of the valve plate arranged in the four-way pipe head during the subsequent inverted discharge and self-spraying production; the hydraulic fracturing and production wellhead device reduces the configuration quantity of gate valves on the vertical drift diameter above the wellhead and greatly reduces the overall height of the Christmas tree; and the disassembly and assembly flow in the operation process is simplified, and the operation of later-stage production is facilitated.

Description

Hydraulic fracturing and production wellhead device and using method thereof
Technical Field
The invention relates to the technical field of oil extraction wellhead devices, in particular to a hydraulic fracturing and production wellhead device and a using method thereof.
Background
In recent years, Xinjiang oil fields have achieved tremendous achievements in the fields of exploration and development, and billions of ton-level large oil and gas fields such as Mar lake oil fields, Gibbage and the like are discovered in succession, and meanwhile, curtains for oil production and fight are also opened.
Because the oil field block belongs to an unconventional oil and gas reservoir, a horizontal well volume fracturing technology is required to be adopted in a development process, and a fracturing wellhead device +2 large-drift-diameter gate valves (namely a main control gate valve) and a fracturing tree structure are adopted for fracturing in the current fracturing operation process. And after the fracturing drilling plug operation is completed, closing the large-drift-diameter gate valve, and installing a Christmas tree with the same specification as the fracturing wellhead to perform reverse discharge and production of fracturing fluid. Because the gate valve can not be disassembled under the condition of not controlling the pressure of a shaft, the gate valve with 1 or 2 large drift diameters always exists on the vertical drift diameter of a wellhead device and the Christmas tree, the integral height of the Christmas tree is increased, great trouble is brought to later-stage production operation, and huge waste of resources of the Christmas tree is also caused.
Disclosure of Invention
The invention provides a hydraulic fracturing and production wellhead device and a using method thereof, overcomes the defects of the prior art, and can effectively solve the problem that the existing Christmas tree is high in overall height.
One of the technical schemes of the invention is realized by the following measures: a hydraulic fracturing and production wellhead device comprises an oil pipe head reducing connector, a first gate valve, a small four-way joint and a pressure-control oil pipe head four-way joint, wherein the pressure-control oil pipe head four-way joint comprises an oil pipe head four-way joint and a main control gate valve;
the main control gate valve comprises a valve plate and a hydraulic driving mechanism capable of controlling the valve plate to open and close the main channel of the oil pipe head four-way, left and right symmetrical ports are arranged on the oil pipe head four-way between the upper part of the front port and the rear port of the oil pipe head four-way and the lower part of the upper port of the oil pipe head four-way, and the left port and the right port are communicated through the main channel of the oil pipe head four-way; the valve plate crosses the right port of the four-way oil pipe head from the left port of the four-way oil pipe head, and the hydraulic driving mechanism is fixedly connected with the left port of the four-way oil pipe head.
The following is a further optimization or/and improvement of one of the above-mentioned technical solutions of the invention:
the left port, the front port, the right port and the rear port of the four-way pipe head are distributed in a staggered manner on the horizontal plane.
An installation ring groove is arranged in the four-way pipe head corresponding to the left port and the right port, and a valve seat is fixedly arranged in the installation ring groove; the inner diameter of the valve seat is the same as that of the oil pipe head cross joint at the joint of the valve seat, the left end of the valve seat is provided with a left through hole coaxially corresponding to the left port of the oil pipe head cross joint, the right end of the valve seat is provided with a right through hole coaxially corresponding to the right port of the oil pipe head cross joint, the valve plate transversely penetrates through the valve seat through the left through hole and the right through hole, and the valve plate is provided with a valve hole which enables the upper port of the oil pipe head cross joint to be communicated with the lower port of.
The left valve cover for covering the left port of the oil pipe head four-way joint is fixedly installed on the outer side of the left port of the oil pipe head four-way joint in a sealing mode, the right valve cover for covering the right port of the oil pipe head four-way joint is fixedly installed on the outer side of the right port of the oil pipe head four-way joint in a sealing mode, a left stepped hole which is narrow in left and wide in right is transversely arranged on the left valve cover and is axially and correspondingly communicated with the left through hole, a right stepped hole which is wide in left and narrow in right is transversely arranged on the right valve cover and is axially and correspondingly communicated with the right through hole, and the valve plate; the left end of the valve plate is fixedly connected with a piston rod of the hydraulic driving mechanism.
The hydraulic driving mechanism comprises a hydraulic cylinder, a piston and a piston rod, wherein the piston rod is arranged in a hydraulic cavity of the hydraulic cylinder in a mode of being coaxial with the valve plate, the piston is fixedly arranged on the outer side of the piston rod, an oil inlet is formed in the side wall of the hydraulic cylinder corresponding to the left end of the hydraulic cavity, an oil outlet is formed in the side wall of the hydraulic cylinder corresponding to the right end of the hydraulic cavity, the cross section of the left end of the piston is narrow at the left and wide at the right, the cross section of the right end of the piston is narrow at the right and wide at the right, a left boosting hydraulic cavity is formed between the outer part of the left end of; the left side of the hydraulic cylinder is fixedly connected with the left valve cover in a sealing mode, a left connecting hole which corresponds to the left port in the axial direction is formed in the left side of the hydraulic cylinder, and the left end of the valve plate is fixedly connected with the right end of the piston rod after penetrating through the left connecting hole.
The hydraulic cylinder comprises a hydraulic cylinder body and a cylinder cover, the cylinder cover and the left part of the hydraulic cylinder body are fixedly installed together in a sealing mode, a hydraulic cavity is formed between the cylinder cover and the hydraulic cylinder body, the left side of the hydraulic cylinder body is fixedly connected with a left valve cover in a sealing mode, a left connecting hole axially corresponding to a left port is formed in the left side of the hydraulic cylinder body, an oil inlet is formed in the side wall of the hydraulic cylinder body corresponding to the left end of the hydraulic cavity, and an oil outlet is formed in the side wall of the hydraulic cylinder; the cylinder cover is provided with a telescopic hole axially corresponding to the piston rod, the cylinder cover outside the telescopic hole is provided with a left valve cover surrounding the telescopic hole, a telescopic stroke enabling the piston rod to be telescopic left and right is formed between the telescopic hole and the left end of the left valve cover, and the left valve cover is provided with an observation port at the position of the piston rod.
The narrow diameter section of the left stepped hole is provided with a left sealing groove with an opening facing to the left, a sealing element is fixedly arranged in the left sealing groove, the sealing element adopts spring energy storage sealing filler or a spring energy storage sealing ring, and a sealing gland is fixedly arranged in the left sealing groove at the outer end of the sealing element; a right sealing groove with a rightward opening is formed in the narrow diameter section of the right stepped hole, a sealing element is fixedly mounted in the right sealing groove, a sealing gland is fixedly mounted in the right sealing groove at the outer end of the sealing element, and a right valve cover for covering the right end of the valve plate is fixedly mounted on the right valve cover outside the right sealing groove; at least one sealing ring is arranged between the outer sides of the valve seats above and below the valve plate and the inner side of the four-way pipe of the oil pipe head.
Radial locking holes are distributed at the upper port of the four-way joint of the tubing head along the circumference, a jackscrew locking mechanism capable of preventing the tubing hanger from moving upwards is fixedly arranged in the radial locking holes, and a sealing assembly capable of being lifted out of a well mouth together with the tubing hanger is fixedly arranged on the outer side of the tubing hanger below the jackscrew locking mechanism; and radial grease injection holes and radial pressure relief holes are circumferentially distributed at the lower end of the four-way joint of the oil pipe head.
The second technical scheme of the invention is realized by the following measures: the use method of the hydraulic fracturing and wellhead production device comprises the following steps: before fracturing, fixedly connecting a pressure control oil pipe head four of a hydraulic fracturing and production wellhead device with a wellhead casing flange, mounting a fracturing tree with the same specification as the pressure control oil pipe head four-way at the upper port of the pressure control oil pipe head four-way, and driving a valve plate to move by a hydraulic driving mechanism so as to communicate a valve hole in the valve plate with a main channel of the oil pipe head four-way, namely opening a main control gate valve to perform fracturing operation;
after fracturing is finished, the hydraulic driving mechanism drives the valve plate to move leftwards, so that a valve hole in the valve plate and a main channel of the four-way pipe head are completely staggered, namely a main control gate valve is closed, then a fracturing tree is disassembled, a well is closed, a Christmas tree which is adaptive to the pressure level in the well is directly installed at the upper port of the four-way pipe head, when reverse drainage and production operation are needed, the main control gate valve arranged in the four-way pipe head is opened through the hydraulic driving mechanism, and reverse drainage and self-spraying production of fracturing fluid are carried out; and when the rotary pumping is needed in the later period, closing a main control gate valve arranged in the four-way of the tubing head, dismantling the Christmas tree, completely opening the main control gate valve arranged in the four-way of the tubing head, lowering an oil well pump and an oil pipe, connecting the tubing hanger and sealing the tubing hanger in the four-way of the tubing head when the last oil pipe is lowered, installing the reducing joint and the parts of the tubing head, and transferring to mechanical production.
According to the invention, after the four-way pipe head and the master control gate valve are integrated, the requirement of fracturing operation can be realized, meanwhile, the pressure control can be carried out on the casing pipe channel, and the Christmas tree installation operation can be completed under the condition of controllable casing pressure by controlling the opening and closing of the valve plate arranged in the four-way pipe head during the subsequent inverted discharge and self-spraying production; the hydraulic fracturing and production wellhead device reduces the configuration quantity of gate valves on the vertical drift diameter above the wellhead and greatly reduces the overall height of the Christmas tree; and the disassembly and assembly flow in the operation process is simplified, and the operation of later-stage production is facilitated.
Drawings
FIG. 1 is a left side view partially cross-sectional structural schematic diagram of the present invention.
FIG. 2 is a schematic sectional view of a cross-section of a pressure control tubing head.
Fig. 3 is an enlarged schematic view of a portion a of fig. 2.
The codes in the figures are respectively: 1 is a pressure control tubing head four-way joint, 2 is a tubing head reducing joint, 3 is a first gate valve, 4 is a small four-way joint, 5 is a production gate valve, 6 is a test gate valve, 7 is a casing gate valve, 8 is a tubing hanger, 9 is a hydraulic driving mechanism, 10 is a tubing head four-way joint, 11 is a valve plate, 12 is a front port, 13 is an upper port, 14 is a left port, 15 is a right port, 16 is a tubing head four-way main channel, 17 is a valve seat, 18 is a valve hole, 19 is a left valve cover, 20 is a right valve cover, 21 is a left stepped hole, 22 is a right stepped hole, 23 is a piston, 24 is a piston rod, 25 is a hydraulic cavity, 26 is an oil inlet, 27 is a left boosting hydraulic cavity, 28 is a right boosting hydraulic cavity, 29 is a left connecting hole, 30 is a hydraulic cylinder body, 31 is a cylinder cover, 32 is a telescopic hole, 33 is a left valve cover, 34 is a sealing element, 35 is a sealing cover, 36 is a right valve cover, 37 is a sealing ring, 39 is a radial grease injection hole, 40 is a radial pressure relief hole, 41 is an oil outlet, 42 is an observation port, 43 is a BT sealing ring, and 44 is a jackscrew locking mechanism.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention.
In the present invention, for convenience of description, the description of the relative positional relationship of the components is described according to the layout pattern of fig. 2 in the specification, such as: the positional relationship of front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of fig. 2 of the specification.
The invention is further described with reference to the following examples and figures:
as shown in the attached drawings 1 to 3, the hydraulic fracturing and production wellhead device comprises an oil pipe head reducing joint 2, a first gate valve 3, a small four-way joint 4 and a pressure control oil pipe head four-way joint 1, wherein the pressure control oil pipe head four-way joint 1 comprises an oil pipe head four-way joint 10 and a main control gate valve, the pressure control oil pipe head four-way joint 1, the oil pipe head reducing joint 2, the first gate valve 3 and the small four-way joint 4 are fixedly connected from bottom to top in sequence, production gate valves 5 are fixedly connected to ports on the front side and the rear side of the small four-way joint 4 respectively, a test gate valve 6 is fixedly communicated with an upper port 13 of the small four-way joint 4, casing gate valves 7 are fixedly connected to ports on the front side and the rear side of the oil pipe head four-way joint 10 above a valve plate 11 respectively, an oil pipe hanger 6;
the main control gate valve comprises a valve plate 11 and a hydraulic driving mechanism 9 capable of controlling the valve plate 11 to open and close an oil pipe head four-way main channel 16, a left port 14 and a right port 15 which are bilaterally symmetrical are arranged on the oil pipe head four-way 10 between the upper part of a front port 12 and a rear port of the oil pipe head four-way 10 and the lower part of an upper port 13 of the oil pipe head four-way 10, and the left port 14 and the right port 15 are communicated through the oil pipe head four-way main channel 16; the valve plate 11 crosses the right port 15 of the four-way pipe head 10 from the left port 14 of the four-way pipe head 10, and the hydraulic driving mechanism 9 is fixedly connected with the left port 14 of the four-way pipe head 10.
The oil collecting head four-way valve integrates an oil pipe head four-way valve 10 and a main control gate valve (a flat gate valve), a valve plate 11 of the main control gate valve is arranged in the oil pipe head four-way valve 10 by penetrating through a left port 14 and a right port 15, the overall height is greatly reduced, the oil collecting head four-way valve 10 and the main control gate valve are integrated, and the communication state of a main channel 16 of the oil pipe head four-way valve is controlled through a hydraulic driving mechanism 9, so that the pressure of a shaft can be controlled.
The oil pipe head four-way main channel 16 is a vertical channel of the oil pipe head four-way 10, the oil pipe head four-way main channel 16 below the valve plate 11 is a sleeve channel, and the sleeve channel is arranged below the valve plate 11 to reserve a sleeve emergency channel.
The valve plate 11 is designed at the position between the casing passage of the four-way pipe head 10 and the oil pipe hanger 6, the oil pipe hanger 6 is not installed in the fracturing operation, the reverse discharge and the self-injection production stages, and the oil pipe hanger 6 is installed through a pressure operation device in the later stage production process.
The hydraulic driving mechanism 9 is arranged, so that the problems that a manual large flat gate valve connected above the existing Christmas tree tubing head four-way joint 10 is large in opening and closing torque and difficult to open and close are solved; because the opening and closing end (valve plate 11) of the main control gate valve is arranged in the oil pipe head four-way joint 10, potential safety hazards caused by ascending operation of personnel are reduced.
Therefore, the device can meet the requirement of fracturing operation, can control the pressure of the casing pipe channel, and can complete the installation operation of the Christmas tree under the condition of controllable casing pressure by controlling the opening and closing of the built-in valve plate 11 of the oil pipe head four-way joint 10 during the subsequent inverted discharge and self-spraying production; the device's use has reduced the configuration quantity of gate valve on the perpendicular latus rectum in well head top, has reduced the whole height of production tree by a wide margin, the operation of the later stage production of being convenient for.
The hydraulic fracturing and production wellhead device can be further optimized or/and improved according to actual needs:
as shown in fig. 2, in order to facilitate the disassembly and assembly of the casing gate valve 7 and the hydraulic drive mechanism 9, effectively utilize the space, and further reduce the overall height of the device, the left port 14, the front port 12, the right port 15 and the rear port of the tubing head cross 10 are distributed in a staggered manner on the horizontal plane.
When the left port 14, the front port 12, the right port 15 and the rear port of the tubing head four-way joint 10 are distributed at intervals of 90 degrees along the horizontal plane, the operation is most convenient, and the overall height reaches the lowest value.
As shown in the attached drawings, an installation ring groove is arranged in the oil pipe head four-way joint 10 corresponding to the left and right ports 15, and a valve seat 17 is fixedly installed in the installation ring groove; the inner diameter of the valve seat 17 is the same as that of the oil pipe head cross joint 10 at the joint of the valve seat 17, the left end of the valve seat 17 is provided with a left through hole coaxially corresponding to the left port 14 of the oil pipe head cross joint 10, the right end of the valve seat 17 is provided with a right through hole coaxially corresponding to the right port 15 of the oil pipe head cross joint 10, the valve plate 11 traverses the valve seat 17 through the left through hole and the right through hole, and the valve plate 11 is provided with a valve hole 18 which can enable the upper port 13 of the oil pipe head cross joint 10 to be communicated with the lower port thereof and has.
The valve seat 17 may be of a two-lobe configuration to facilitate disassembly and assembly.
The valve seat 17 supports the valve plate 11, and when the main control gate valve is fully opened, the valve hole 18 of the main control gate valve is consistent with the drift diameter of the oil pipe head cross 10 (at the main channel 16 of the oil pipe head cross connected with the valve seat 17) so as not to influence the conventional operation.
The hydraulic driving mechanism 9 achieves the purpose of pressure control by controlling the communication state of the valve hole 18 of the valve plate 11 and the oil pipe head four-way main channel 16, and meanwhile, when the valve hole 18 on the valve plate 11 is communicated with the oil pipe head four-way main channel 16, the valve hole 18 on the valve plate 11 can be used as a liquid channel, namely, the valve plate 11 integrates a liquid channel and pressure control.
As shown in fig. 2, a left valve cover 19 covering the left port 14 of the tubing head four-way 10 is fixedly and hermetically mounted on the outer side of the left port 14 of the tubing head four-way 10, a right valve cover 20 covering the right port 15 of the tubing head four-way 10 is fixedly and hermetically mounted on the outer side of the right port 15 of the tubing head four-way 10, a left stepped hole 21 which is narrow at the left and wide at the right and is axially and correspondingly communicated with the left through hole is transversely arranged on the left valve cover 19, a right stepped hole 22 which is wide at the left and narrow at the right and is axially and correspondingly communicated with the right through hole is transversely arranged on the right valve cover 20, and the valve plate 11 sequentially passes through the left stepped hole 21; the left end of the valve plate 11 is fixedly connected with a piston rod 24 of the hydraulic driving mechanism 9.
The left valve cover 19 and the right valve cover 20 support the valve plate 11, and the wide-diameter sections of the left stepped hole 21 and the right stepped hole 22 form annular cavities, so that the valve plate 11 can move left and right, and pressure build-up is prevented.
As shown in fig. 2 and 3, the hydraulic driving mechanism 9 includes a hydraulic cylinder, a piston 23 and a piston rod 24, the piston rod 24 is disposed in a hydraulic chamber 25 of the hydraulic cylinder in a manner coaxial with the valve plate 11, the piston 23 is fixedly mounted on the outer side of the piston rod 24, an oil inlet 26 is disposed on a side wall of the hydraulic cylinder corresponding to the left end of the hydraulic chamber 25, an oil outlet 41 is disposed on a side wall of the hydraulic cylinder corresponding to the right end of the hydraulic chamber 25, the cross section of the left end of the piston 23 is narrow on the left and wide on the right, the cross section of the right end of the piston 23 is narrow on the right and wide on the right, a left boosting hydraulic chamber 27 is formed between the outer left end of the piston 23 and the inner wall; the left side of the hydraulic cylinder is fixedly connected with the left valve cover 19 in a sealing mode, the left side of the hydraulic cylinder is provided with a left connecting hole 29 axially corresponding to the left port 14, and the left end of the valve plate 11 penetrates through the left connecting hole 29 and then is fixedly connected with the right end of the piston rod 24.
As shown in fig. 2 and 3, the hydraulic cylinder includes a hydraulic cylinder body 30 and a cylinder cover 31, the cylinder cover 31 is fixedly and hermetically mounted with the left portion of the hydraulic cylinder body 30, a hydraulic cavity 25 is formed between the cylinder cover 31 and the hydraulic cylinder body 30, the left side of the hydraulic cylinder body 30 is fixedly and hermetically connected with a left valve cover 19, the left side of the hydraulic cylinder body 30 is provided with a left connecting hole 29 axially corresponding to the left port 14, the side wall of the hydraulic cylinder body 30 corresponding to the left end of the hydraulic cavity 25 is provided with an oil inlet 26, and the side wall of the hydraulic cylinder body 30 corresponding to the right end of the hydraulic cavity 25; a telescopic hole 32 corresponding to the axial direction of the piston rod 24 is provided in the cylinder head 31, a left valve cover 33 surrounding the telescopic hole 32 is provided in the cylinder head 31 outside the telescopic hole 32, a telescopic stroke enabling the piston rod 24 to be telescopic in the left-right direction is formed between the telescopic hole 32 and the left end of the left valve cover 33, and an observation port 42 for observing the position of the piston rod 24 is provided in the left valve cover 33.
Fig. 2 shows the oil pipe head four-way main passage 16 in a communicating state (i.e., an open state), i.e., the oil pipe head four-way main passage 16 communicates with the valve hole 18 of the valve plate 11. The communication state in fig. 2 is explained as the initial state.
When the valve needs to be closed (the oil pipe head four-way main channel 16 is blocked), hydraulic oil is pumped through the oil outlet 41, the piston 23 moves leftwards under the action of the hydraulic oil, and the piston 23 drives the piston rod 24 to move leftwards, so that the valve plate 11 is driven to move leftwards until the valve hole 18 in the valve plate 11 is completely staggered with the oil pipe head four-way main channel 16, and the oil pipe head four-way main channel 16 is blocked; at the same time as the piston 23 moves leftward, the hydraulic oil in the left hydraulic chamber 25 of the piston 23 is discharged through the oil inlet port 26, thereby completing the valve-closing operation.
When the valve needs to be opened, hydraulic oil is pumped in through the oil inlet 26, the valve plate 11 moves rightwards until the valve hole 18 in the valve plate 11 is vertically and correspondingly communicated with the oil pipe head four-way main channel 16, and therefore the valve opening operation is completed.
The left boosting hydraulic cavity 27 is arranged to facilitate hydraulic oil to push the piston 23 which is moved to the left end of the hydraulic cavity 25 to the right; the provision of right boost hydraulic chamber 28 facilitates hydraulic oil to push piston 23 to the right of hydraulic chamber 25 to the left.
The opening and closing state of the built-in master control gate valve can be known by observing the position of the piston rod 24 through the observation port 42.
As shown in fig. 2, a left sealing groove with an opening facing left is arranged at the narrow diameter section of the left stepped hole 21, a sealing element 34 is fixedly installed in the left sealing groove, the sealing element 34 adopts spring energy storage sealing packing or a spring energy storage sealing ring 37, and a sealing gland 35 is fixedly installed in the left sealing groove at the outer end of the sealing element 34; a right sealing groove with a rightward opening is formed in the narrow diameter section of the right stepped hole 22, a sealing element 34 is fixedly installed in the right sealing groove, a sealing gland 35 is fixedly installed in the right sealing groove at the outer end of the sealing element 34, and a right valve cover 36 for covering the right end of the valve plate 11 is fixedly installed on the right valve cover 20 on the outer side of the right sealing groove; at least one sealing ring 37 is arranged between the outer sides of the valve seats 17 above and below the valve plate 11 and the inner side of the oil pipe head four-way joint 10.
The valve rod seal adopts a spring energy storage seal structure (spring energy storage seal packing or a spring energy storage seal ring 37), and the seal reliability of the built-in master control gate valve is greatly improved.
As shown in fig. 1 and 2, radial locking holes 38 are circumferentially distributed at the upper port 13 of the tubing head four-way joint 10, a jackscrew locking mechanism 44 capable of preventing the tubing hanger 6 from moving upwards is fixedly installed in the radial locking holes 38, and a sealing assembly capable of being lifted out of a wellhead together with the tubing hanger 6 is fixedly installed at the outer side of the tubing hanger 6 below the jackscrew locking mechanism 44; and a radial grease injection hole 39 and a radial pressure relief hole 40 are circumferentially distributed at the lower port of the tubing head four-way joint 10.
BT sealing rings 43 are respectively and fixedly arranged at the inner ends of the radial grease injection holes 39 and the radial pressure relief holes 40, and communication channels for communicating the oil pipe head four-way main channel 16 with the radial grease injection holes 39 and the radial pressure relief holes 40 are arranged on the corresponding BT sealing rings 43.
The BT seal ring 43 can realize the functions of grease injection and sealing of the sleeve.
The spring energy storage sealing filler, the spring energy storage sealing ring 37 and the BT sealing ring 43 are all sealing parts which are well known and used in the prior art.
The jack screw locking mechanism 44 may be a left jack screw sealing mechanism or a right jack screw sealing mechanism as described in chinese patent publication No. 204851201U (patent name: wellhead connection device, steam injection device, and production device), or may be a jack screw locking mechanism 44 of other prior art. The seal assembly mounted at the tubing hanger 6 employs other conventionally known common seals 34 such as a conventionally known common metal seal ring 37.
The above technical features constitute a preferred embodiment of the present invention, which has strong adaptability and implementation effect, and unnecessary technical features can be increased or decreased according to actual needs to meet the requirements of different situations.
The use process of the invention is as follows:
before fracturing, a pressure control tubing head four 1 of the device is fixedly connected with a wellhead casing flange, a fracturing tree with the same specification is installed at an upper port 13 of the pressure control tubing head four-way 1, a hydraulic driving mechanism 9 drives a valve plate 11 to move to the position shown in figure 2, so that a valve hole 18 in the valve plate 11 is communicated with a tubing head four-way main channel 16 (namely, a main control gate valve is opened), and fracturing operation is carried out.
After fracturing, the hydraulic driving mechanism 9 drives the valve plate 11 to move leftwards, so that the valve hole 18 on the valve plate 11 and the main channel 16 of the tubing head four-way are completely staggered (namely, the main control gate valve is closed), the pressure of a shaft is controlled, after a fracturing tree is disassembled, the well is plugged, a Christmas tree which is suitable for the pressure level in the well is directly installed at the upper port 13 of the pressure control tubing head four-way 1, when reverse drainage and production operation are required, the main control gate valve arranged in the tubing head four-way 10 is opened through the hydraulic driving mechanism 9, and reverse drainage and self-spraying production of fracturing fluid are carried out; and when the rotary pumping is needed in the later period, closing a main control gate valve arranged in the tubing head four-way joint 10, dismantling the Christmas tree, completely opening the main control gate valve arranged in the tubing head four-way joint 10 under the cooperation of the existing under-pressure operation device, putting in an oil well pump and an oil pipe, connecting the tubing hanger 6 and sealing the tubing hanger in the tubing head four-way joint 10 when the last oil pipe is put down, installing the tubing head reducing joint 2 and the parts above, and turning to mechanical production.

Claims (10)

1. A hydraulic fracturing and production wellhead device is characterized by comprising an oil pipe head reducing connector, a first gate valve, a small cross joint and a pressure control oil pipe head cross joint, wherein the pressure control oil pipe head cross joint comprises an oil pipe head cross joint and a main control gate valve;
the main control gate valve comprises a valve plate and a hydraulic driving mechanism capable of controlling the valve plate to open and close the main channel of the oil pipe head four-way, left and right symmetrical ports are arranged on the oil pipe head four-way between the upper part of the front port and the rear port of the oil pipe head four-way and the lower part of the upper port of the oil pipe head four-way, and the left port and the right port are communicated through the main channel of the oil pipe head four-way; the valve plate crosses the right port of the four-way oil pipe head from the left port of the four-way oil pipe head, and the hydraulic driving mechanism is fixedly connected with the left port of the four-way oil pipe head.
2. The hydraulic fracturing and production wellhead assembly of claim 1, wherein the left, front, right and rear tubing head cross-piece ports are staggered in the horizontal plane.
3. The hydraulic fracturing and production wellhead assembly of claim 1 or 2, wherein the tubing head cross corresponding to the left and right ports is provided with a mounting ring groove, and a valve seat is fixedly mounted in the mounting ring groove; the inner diameter of the valve seat is the same as that of the oil pipe head cross joint at the joint of the valve seat, the left end of the valve seat is provided with a left through hole coaxially corresponding to the left port of the oil pipe head cross joint, the right end of the valve seat is provided with a right through hole coaxially corresponding to the right port of the oil pipe head cross joint, the valve plate transversely penetrates through the valve seat through the left through hole and the right through hole, and the valve plate is provided with a valve hole which enables the upper port of the oil pipe head cross joint to be communicated with the lower port of.
4. The hydraulic fracturing and production wellhead device according to claim 3, wherein a left valve cover for covering the left port of the tubing head cross-way is fixedly mounted on the outer side of the left port of the tubing head cross-way in a sealing manner, a right valve cover for covering the right port of the tubing head cross-way is fixedly mounted on the outer side of the right port of the tubing head cross-way in a sealing manner, a left stepped hole which is narrow at the left and wide at the right is transversely arranged on the left valve cover and is axially and correspondingly communicated with the left through hole, a right stepped hole which is wide at the left and narrow at the right is transversely arranged on the right valve cover and is axially and correspondingly communicated with the right through hole, and the valve plate sequentially penetrates through the left stepped hole; the left end of the valve plate is fixedly connected with a piston rod of the hydraulic driving mechanism.
5. The hydraulic fracturing and production wellhead device according to claim 4, wherein the hydraulic driving mechanism comprises a hydraulic cylinder, a piston and a piston rod, the piston rod is arranged in a hydraulic cavity of the hydraulic cylinder in a manner coaxial with the valve plate, the piston is fixedly arranged on the outer side of the piston rod, an oil inlet is arranged on the side wall of the hydraulic cylinder corresponding to the left end of the hydraulic cavity, an oil outlet is arranged on the side wall of the hydraulic cylinder corresponding to the right end of the hydraulic cavity, the cross section of the left end of the piston is narrow on the left and wide on the right, the cross section of the right end of the piston is narrow on the right and wide on the right, a left boosting hydraulic cavity is formed between the outer part of the left end of the piston and the inner wall; the left side of the hydraulic cylinder is fixedly connected with the left valve cover in a sealing mode, a left connecting hole which corresponds to the left port in the axial direction is formed in the left side of the hydraulic cylinder, and the left end of the valve plate is fixedly connected with the right end of the piston rod after penetrating through the left connecting hole.
6. The hydraulic fracturing and production wellhead device according to claim 5, wherein the hydraulic cylinder comprises a hydraulic cylinder body and a cylinder cover, the cylinder cover and the left part of the hydraulic cylinder body are fixedly and hermetically installed together, a hydraulic cavity is formed between the cylinder cover and the hydraulic cylinder body, the left side of the hydraulic cylinder body is fixedly and hermetically connected with a left valve cover, the left side of the hydraulic cylinder body is provided with a left connecting hole axially corresponding to a left port, the side wall of the hydraulic cylinder body corresponding to the left end of the hydraulic cavity is provided with an oil inlet, and the side wall of the hydraulic cylinder body corresponding to the right end of the hydraulic cavity is provided with; the cylinder cover is provided with a telescopic hole axially corresponding to the piston rod, the cylinder cover outside the telescopic hole is provided with a left valve cover surrounding the telescopic hole, a telescopic stroke enabling the piston rod to be telescopic left and right is formed between the telescopic hole and the left end of the left valve cover, and the left valve cover is provided with an observation port at the position of the piston rod.
7. The hydraulic fracturing and production wellhead assembly according to claim 4, 5 or 6, wherein the narrow diameter section of the left stepped bore is provided with a left seal groove with an opening facing to the left, a seal is fixedly installed in the left seal groove, the seal is spring energy storage seal packing or a spring energy storage seal ring, and a seal gland is fixedly installed in the left seal groove at the outer end of the seal; or/and a right sealing groove with a rightward opening is arranged at the narrow diameter section of the right stepped hole, a sealing element is fixedly arranged in the right sealing groove, a sealing gland is fixedly arranged in the right sealing groove at the outer end of the sealing element, and a right valve cover for covering the right end of the valve plate is fixedly arranged on the right valve cover at the outer side of the right sealing groove; or/and at least one sealing ring is arranged between the outer sides of the valve seats above and below the valve plate and the inner side of the four-way pipe head.
8. The hydraulic fracturing and production wellhead assembly according to claim 1, 2, 4, 5 or 6, wherein radial locking holes are circumferentially distributed at the upper port of the four-way joint of the tubing head, a jackscrew locking mechanism capable of preventing the tubing hanger from moving upwards is fixedly installed in the radial locking holes, and a sealing assembly capable of being lifted out of the wellhead together with the tubing hanger is fixedly installed on the outer side of the tubing hanger below the jackscrew locking mechanism; or/and radial grease injection holes and radial pressure relief holes are distributed at the lower port of the four-way joint of the tubing head along the circumference.
9. The hydraulic fracturing and production wellhead assembly according to claim 3 or 7, wherein radial locking holes are circumferentially distributed at the upper port of the four-way joint of the tubing head, a jackscrew locking mechanism capable of preventing the tubing hanger from moving upwards is fixedly installed in the radial locking holes, and a sealing assembly capable of being lifted out of a wellhead together with the tubing hanger is fixedly installed on the outer side of the tubing hanger below the jackscrew locking mechanism; or/and radial grease injection holes and radial pressure relief holes are distributed at the lower port of the four-way joint of the tubing head along the circumference.
10. A method of using a hydraulic fracturing and production wellhead according to any one of claims 1 to 9, characterised in that it is carried out as follows: before fracturing, fixedly connecting a pressure control oil pipe head four of a hydraulic fracturing and production wellhead device with a wellhead casing flange, mounting a fracturing tree with the same specification as the pressure control oil pipe head four-way at the upper port of the pressure control oil pipe head four-way, and driving a valve plate to move by a hydraulic driving mechanism so as to communicate a valve hole in the valve plate with a main channel of the oil pipe head four-way, namely opening a main control gate valve to perform fracturing operation; after fracturing is finished, the hydraulic driving mechanism drives the valve plate to move leftwards, so that a valve hole in the valve plate and a main channel of the four-way pipe head are completely staggered, namely a main control gate valve is closed, then a fracturing tree is disassembled, a well is closed, a Christmas tree which is adaptive to the pressure level in the well is directly installed at the upper port of the four-way pipe head, when reverse drainage and production operation are needed, the main control gate valve arranged in the four-way pipe head is opened through the hydraulic driving mechanism, and reverse drainage and self-spraying production of fracturing fluid are carried out; and when the rotary pumping is needed in the later period, closing a main control gate valve arranged in the four-way of the tubing head, dismantling the Christmas tree, completely opening the main control gate valve arranged in the four-way of the tubing head, lowering an oil well pump and an oil pipe, connecting the tubing hanger and sealing the tubing hanger in the four-way of the tubing head when the last oil pipe is lowered, installing the reducing joint and the parts of the tubing head, and transferring to mechanical production.
CN201911158609.0A 2019-11-22 2019-11-22 Hydraulic fracturing and production wellhead device and using method thereof Pending CN111022016A (en)

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