CN213980745U - Operation blowout prevention thermal recovery wellhead four-way joint - Google Patents

Abstract

The utility model relates to a well head cross is adopted in heat blowout prevention in operation. The cross joint comprises a cross joint main body, the cross joint main body comprises an upper flange, the upper flange is used for installing a blowout preventer before an oil outlet pipe is started, a transverse channel and a vertical channel are arranged in the cross joint main body, the vertical channel comprises a conical section with a large upper part and a small lower part, and the conical section is located above the transverse channel. The four-way joint also comprises a hanger which is adapted to be located on the conical section, the outer wall of the hanger is in sealing fit with the inner wall of the vertical channel, and a through channel which is communicated up and down is arranged in the hanger; the lower end of the hanger is provided with a lower thread structure which is used for connecting an oil pipe; the cross joint further comprises a hanger pressing cover, the hanger pressing cover is detachably and fixedly installed in the vertical channel and used for pressing the hanger downwards, and the hanger pressing cover is a ring body and communicated with a through channel of the hanger. The hanger is pressed by the hanger gland, so that the steam injection effect and safety of the heavy oil thermal recovery well are ensured, and the effective fixation of an oil pipe in a shaft is ensured.

Description

Operation blowout prevention thermal recovery wellhead four-way joint

Technical Field

The utility model relates to a well head cross is adopted in heat blowout prevention in operation.

Background

In the prior art, a hanger is placed in a four-way support during thermal recovery and gas injection, an oil pipe is connected below the hanger, a jackscrew penetrates through a thread on the side wall of the four-way support, the hanger is limited, and the hanger and the oil pipe are prevented from moving upwards under an upward acting force during steam injection. However, there are problems in that: the hot steam is easy to penetrate out of the jackscrew and is sprayed out of one side of the four-way valve, safety risk and poor overall sealing performance exist after the hot steam is sprayed out, and the jackscrew is easy to corrode during long-term use, so that the jackscrew cannot be normally used.

For solving this problem, satisfy the effect and the safety of viscous crude steam injection, present thermal recovery well head cross adopts no jackscrew, no hanger cross, installs the flange gland in the last flange department of thermal recovery well cross, and the oil pipe screw assembly in the pit is on the flange gland, but present structure has following problem: when the underground operation is required due to the underground fault, the oil pipe in the well must be lifted up firstly, and the flange gland is disassembled, and then the wellhead blowout preventer can be installed on the four-way flange, but the flow does not meet the well control safety requirement of 'installing the blowout preventer before the operation'. In addition, the characteristics of viscous crude thermal recovery well are shallow, thin, thick, the sand production is serious, and the tubular column sand buries the part often has the trap pressure in the well during conventional operation, when last oil pipe dismantles thermal recovery well head flange gland, often comes too late to install preventer, will take place the blowout phenomenon, and the characteristics of viscous crude thermal recovery well blowout are: the blowout is quick (several seconds), the temperature is high, the sand content is large, and as a result, the wellhead can not be controlled and is out of control, thereby causing personal injury, environmental pollution and property loss.

Moreover, the conventional well killing operation cannot meet the requirement of thick oil thermal recovery development, and with the obvious technical advantages of the operation under pressure, part of wells need to be completed under pressure, however, due to the pressure in the wells, the well head cannot be detached and the blowout preventer cannot be installed in front of the pipe column, so that the operation under pressure cannot be implemented.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a hot recovery well head cross is prevented spouting in operation to play out the technical problem that can't install the preventer before oil pipe among the solution prior art.

In order to achieve the purpose, the utility model discloses the technical scheme of operation prevent spouting hot recovery well head cross is: a wellhead cross-piece for thermal recovery against blowout in operations, comprising:

the four-way main body comprises an upper flange, the upper flange is used for installing a blowout preventer before an oil outlet pipe is lifted, a transverse channel and a vertical channel are arranged in the four-way main body, the vertical channel comprises a conical section with a large upper part and a small lower part, and the conical section is positioned above the transverse channel;

the hanger is adapted to be located on the conical section, the outer wall of the hanger is in sealing fit with the inner wall of the vertical channel, and a through channel which is communicated up and down is arranged in the hanger;

the lower end of the hanger is provided with a lower thread structure which is used for connecting an oil pipe;

the cross joint further comprises a hanger pressing cover, the hanger pressing cover is detachably and fixedly installed in the vertical channel and used for pressing the hanger downwards, and the hanger pressing cover is a ring body and communicated with a through channel of the hanger.

The utility model has the advantages that: the hanger is fixed in the four-way main body through the cooperation of hanger gland and conic section, and the hanger seals the cooperation with conic section, prevents that steam from revealing, even reveal also can only flow along the four-way main body upwards, seals through the structures such as valve of four-way main body top. The utility model discloses in compress tightly the hanger with the hanger gland, not only ensured viscous crude thermal recovery well steam injection effect and safety, ensured oil pipe's in the pit shaft effective fixed moreover. Because the hanger gland is installed inside the cross main body, can the direct mount preventer on last flange, make the hanger gland keep compressing tightly the state of hanger simultaneously, after treating the installation preventer, because the hanger gland can be dismantled with the cross main body and link to each other, can take off the hanger gland to the oil pipe of hanger and hanger below is played out in proper order, the difficult technical problem that can't install the preventer before moving oil pipe among the prior art has been solved.

As a further optimized solution, the top surface of the hanger gland is flush with the top surface of the upper flange, or the top surface of the hanger gland is located below the top surface of the upper flange.

The effect of this scheme lies in, hanger gland top surface and last flange top surface parallel and level or be located its below, make things convenient for the preventer to install on last flange.

As a further optimized scheme, an internal thread is arranged above the conical section in the vertical channel, so that the hanger gland is in threaded fit in the vertical channel.

The effect of this scheme lies in, and removable ground fixed mounting of hanger gland adoption screw assembly's mode is in vertical passageway, and it is all convenient to tear open the ann.

As a further optimized scheme, a square hole is formed in the hanger gland, so that the hanger gland is a ring body, and the square hole is used for allowing a square body of a disassembling tool to penetrate in a matching mode so as to screw the hanger gland.

As a further optimized scheme, the lower threaded structure is an oil pipe connecting threaded hole which is used for connecting an oil pipe.

As a further optimized scheme, the upper part of the inner wall of the through channel of the hanger is provided with a lifting short section thread, and the lifting short section thread is used for connecting a lifting short section.

As a further preferred solution, the hanger comprises an annular boss at the top.

The effect of this scheme lies in, and the annular boss makes things convenient for instrument chucking hanger such as breakout tongs with rotatory hanger.

As a further optimized scheme, a sealing groove is formed in the outer wall of the hanger and used for installing a sealing ring to be in sealing fit with the inner wall of the four-way main body.

Drawings

FIG. 1 is a schematic view of the four-way wellhead embodiment 1 of the anti-blowout thermal recovery system of the present invention;

FIG. 2 is a schematic view of the cross-piece body of FIG. 1;

FIG. 3 is a schematic view of the hanger of FIG. 1;

FIG. 4 is a top view of the hanger gland of FIG. 1

FIG. 5 is a schematic half-sectional view of a side view of the hanger gland of FIG. 1;

FIG. 6 is a schematic view of the gland removal tool for removing the hanger gland in the four-way embodiment 1 of the blowout preventing thermal recovery wellhead of the present invention;

FIG. 7 is a schematic view of section A-A of FIG. 6;

description of reference numerals:

in the attached figure 1: a 100-four-way body; 200-a hanger; 300-hanger gland;

in the attached fig. 2: a 100-four-way body; 101-a vertical channel; 102-a transverse channel; 103-conical seat; 104-internal thread; 105-an upper flange; 106-lower flange;

in FIG. 3: 200-a hanger; 201-sealing groove; 202-oil pipe connecting thread; 203-lifting short section thread; 204-boss;

in fig. 4: 300-hanger gland; 301-hexagonal holes; 302-external threads;

in fig. 5: 300-hanger gland; 302-external threads;

in fig. 6: 401-hexagonal; 402-rotating the nipple;

in FIG. 7: 400-a gland removal tool; 401-hexagonal; 402-rotating the nipple.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the described embodiments are only some, but not all embodiments of the invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The features and properties of the present invention are described in further detail below with reference to examples.

The utility model discloses a specific embodiment 1 of well head cross is adopted in heat blowout prevention in operation:

as shown in fig. 1 to 7, the working blowout prevention thermal recovery wellhead four-way (hereinafter referred to as the four-way) is a part of a thermal recovery wellhead device and is used for suspending a tubing and preventing blowout when a blowout preventer is installed.

As shown in fig. 1, the four-way joint comprises a four-way body 100, and a hanger 200 and a hanger gland 300 which are installed in the four-way body 100, the four-way body 100 is structured as shown in fig. 2, a cross-shaped vertical flow passage 101 and a cross-shaped transverse passage 102 are arranged in the four-way body 100, and the hanger 200 and the hanger gland 300 are installed in the vertical flow passage 101 and are located on the cross-shaped transverse passage 102. The four-way body 100 comprises an upper flange 105 and a lower flange 106, wherein the lower flange 106 is connected with the upper flange of the wellhead casing head when in use, and a blowout preventer is arranged on the upper flange 105 when the blowout preventer needs to be arranged.

A conical section is arranged above the transverse channel 102 in the vertical flow channel 101, the inner diameter of the conical section is large at the top and small at the bottom, so that a conical seat 103 is formed above the transverse channel 102, and the hanger 200 is located on the conical seat 103. An internal thread 104 is further formed on the inner wall of the vertical flow passage 101, and the internal thread 104 is located above the conical seat 103. The internal thread 104 is a rectangular thread, and the thread shape of the internal thread in other embodiments can be changed as needed.

The hanger 200 has a structure as shown in fig. 3, the hanger 200 is integrally penetrated up and down to allow other fluids such as steam to pass through, three seal grooves 201 are arranged on the outer wall surface of the hanger 200 along the up-down direction, the seal grooves 201 are used for mounting high temperature (320 ℃) resistant seal rings, and as can be seen from fig. 3, the positions of the seal grooves 201 opened in the hanger 200 are in a tapered shape with a large top and a small bottom, and are adapted to the shape of the tapered seat 103. The lower end of the hanger 200 is provided with an oil pipe connecting thread 202 for connecting with an oil pipe below, and the upper end of the hanger 200 is provided with a lifting short section thread 203 for connecting with a lifting short section. Hanger 200 also includes a boss 204 at the top where boss 204 is primarily used to facilitate the clamping of pipe tongs and the like. To facilitate media passage, boss 204 is here an annular boss.

The structure of the hanger pressing cover 300 is as shown in fig. 4 and 5, the hanger pressing cover 300 is a ring body, a through square hole is formed inside the hanger pressing cover 300, the square hole is a hexagonal hole 301, an external thread 302 is formed on the outer wall of the hanger pressing cover 300, and the external thread 302 is used for being installed in a matching mode with the internal thread 104.

For carrying out the dismouting to hanger gland 300, need use gland extracting tool 400, gland extracting tool 400's structure is as shown in fig. 6 and 7, gland extracting tool 400 is including the square body that is located the bottom, and the square body here is hexagonal body 401, the shape of hexagonal body 401 and the shape adaptation of hexagonal hole 301, and the adaptation here indicates that hexagonal body 401 stretches into after the hexagonal hole 301, can drive hanger gland 300 and rotate to do not mean that both's size is identical completely. A rotating short section 402 is welded and fixed above the hexagonal body 401, and the rotating short section 402 is matched with the rotary mechanism when in use, so as to drive the gland dismounting tool 400 to rotate.

During assembly, the lower flange 106 of the four-way main body 100 is connected with the upper flange of a wellhead casing head, the hanger 200 is connected with an underground oil pipe, and is located on the conical seat 103 of the four-way main body 100 from top to bottom to bear the weight of the oil pipe, and the high-temperature-resistant sealing ring on the hanger 200 is sealed with the inner wall of the four-way main body 100. The gland removing tool 400 is used for screwing the hanger gland 300 on the internal thread 104 of the four-way main body 100, the pipe wrench is used for rotating the rotating short section 402 of the gland removing tool 400 to screw the thread in place, the hanger 200 is compressed, the hanger 200 is fixed, and the hanger 200 and an oil pipe are prevented from moving upwards. When assembled, the top surface of hanger gland 300 is flush with the top surface of upper flange 105. And finally, connecting the lifting short section threads 203 on the upper part of the hanger 200 with a wellhead short section, connecting the upper part of the wellhead short section with a four-way flange gland, and sequentially installing other parts of the wellhead to complete the installation of the whole wellhead.

During operation, oil pipes need to be lifted out, the parts above the wellhead four-way flange gland are firstly dismounted, the wellhead four-way flange gland and the short sections on the hanger 200 are dismounted according to the reverse sequence, then the blowout preventer is mounted on the upper flange 105, after the blowout preventer is qualified in site pressure test, the gland dismounting tool 400 is used for dismounting the hanger gland 300, the hanger 200 is released from fixation, the lifting short sections are connected with the internal threads 104 on the upper part of the conical hanger 200, and the oil pipes are lifted out in sequence to carry out construction operation.

In this embodiment, tubing connector threads 202 are coupled to tubing during use and travel through tubing connector threaded holes provided in hanger 200 to form the hanger's lower thread configuration.

The utility model discloses operation is prevented spouting specific embodiment 2 of hot well head cross:

in embodiment 1, the outer wall of the hanger is provided with a sealing groove for installing a sealing ring to realize sealing fit with the inner wall of the four-way main body. In this embodiment, set up the seal groove on the inner wall of cross main part and install the sealing washer, improve the smoothness degree of hanger outer wall to seal with the sealing washer cooperation.

The utility model discloses operation is prevented spouting specific embodiment 3 of hot well head cross:

in example 1, the hanger includes an annular boss at the top. In this embodiment, the annular boss may be eliminated.

The utility model discloses operation is prevented spouting specific embodiment 4 of hot well head cross:

in embodiment 1, the upper part of the hanger is provided with a lifting short section thread. In this embodiment, can set up annular boss at the top of hanger, set up the external screw thread on the outer wall of annular boss, be connected with the interior screw-thread fit that promotes the nipple joint.

The utility model discloses operation is prevented spouting specific embodiment 5 of hot well head cross:

in embodiment 1, the lower thread structure is an oil pipe connection thread hole. In this embodiment, lower helicitic texture is the screw thread boss of setting in the hanger lower extreme, and the screw thread boss has the external screw thread, is used for cooperating the installation with the internal thread of oil pipe.

The utility model discloses operation is prevented spouting specific embodiment 6 of hot well head cross:

in embodiment 1, the hanger gland is provided with a square hole, and the square hole is a hexagonal hole. In this embodiment, the square hole may be a square hole, a pentagonal hole, or other shapes. Or, the hole on the hanger gland can be a round hole, and when the hanger gland needs to be disassembled and assembled, the hanger gland needs to be propped tightly for rotation and disassembly and assembly. In other embodiments, the top of the hanger gland can be provided with a screwing protrusion for screwing rotation of a disassembling tool.

The utility model discloses operation is prevented spouting specific embodiment 7 of hot well head cross:

in embodiment 1, the hanger gland is screw-fitted to the four-way body. In this embodiment, the hanger can adopt other modes to install on the cross main part, specifically, sets up the annular in the top of cross main part taper section, sets up the spout that extends from top to bottom above the annular, and the spout has two or more, spout and annular intercommunication. The hanger is provided with a bulge in a radial protruding mode, and the bulge can be matched with the sliding groove. During assembly, the hanger is downwards arranged in the four-way main body, the protrusion is inserted into the sliding groove, when the position of the ring groove is reached, the hanger is rotated, the protrusion of the hanger is rotated into the ring groove and stopped with the groove wall of the ring groove up and down, and fixation is achieved.

The utility model discloses operation is prevented spouting specific embodiment 8 of hot well head cross:

in example 1, the top surface of the hanger gland was flush with the top surface of the upper flange. In this embodiment, after the hanger gland is installed in place, the top surface of the hanger gland may be located below the top surface of the upper flange. In other embodiments, even if the top surface of the hanger gland is above the top surface of the upper flange, the operational requirements can be met as long as the subsequent installation of the blowout preventer is not affected.

The above description is only for the preferred embodiment of the present invention, and the present invention is not limited thereto, the protection scope of the present invention is defined by the claims, and all structural changes equivalent to the contents of the description and drawings of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. The utility model provides an operation is prevented spouting hot well head cross which characterized in that: the method comprises the following steps:

the four-way main body (100) comprises an upper flange (105), the upper flange (105) is used for installing a blowout preventer before an oil outlet pipe is started, a transverse channel (102) and a vertical channel (101) are arranged in the four-way main body (100), the vertical channel (101) comprises a conical section with a large upper part and a small lower part, and the conical section is positioned above the transverse channel (102);

the hanger (200) is located on the conical section in a matched mode, the outer wall of the hanger (200) is in sealing fit with the inner wall of the vertical channel (101), and a through channel which is communicated up and down is arranged in the hanger (200);

the lower end of the hanger (200) is provided with a lower thread structure which is used for connecting an oil pipe;

the four-way joint further comprises a hanger pressing cover (300), the hanger pressing cover (300) is detachably and fixedly installed in the vertical channel (101) and used for pressing the hanger (200) downwards, and the hanger pressing cover (300) is a ring body and communicated with a through channel of the hanger (200).

2. The operational blowout prevention thermal recovery wellhead cross according to claim 1, wherein: the top surface of the hanger gland (300) is flush with the top surface of the upper flange (105), or the top surface of the hanger gland (300) is positioned below the top surface of the upper flange (105).

3. The operational blowout prevention thermal recovery wellhead spool according to claim 1 or 2 wherein: an internal thread is arranged above the conical section in the vertical channel (101) so that the hanger gland (300) is in threaded fit in the vertical channel (101).

4. The operational blowout prevention thermal recovery wellhead spool according to claim 3, wherein: the hanger gland (300) is provided with a square hole, so that the hanger gland (300) is a ring body, and the square hole is used for the square body of a disassembling tool to be matched and penetrated so as to screw the hanger gland (300).

5. The operational blowout prevention thermal recovery wellhead spool according to claim 1 or 2 wherein: the lower threaded structure is an oil pipe connecting threaded hole which is used for connecting an oil pipe.

6. The operational blowout prevention thermal recovery wellhead spool according to claim 1 or 2 wherein: and a lifting short section thread (203) is arranged on the upper part of the inner wall of the through channel of the hanger (200), and the lifting short section thread (203) is used for connecting a lifting short section.

7. The operational blowout prevention thermal recovery wellhead spool according to claim 1 or 2 wherein: the hanger (200) includes an annular boss at the top.

8. The operational blowout prevention thermal recovery wellhead spool according to claim 1 or 2 wherein: the outer wall of the hanger (200) is provided with a sealing groove (201), and the sealing groove (201) is used for installing a sealing ring to be in sealing fit with the inner wall of the four-way main body (100).

Images