CN111305785A - Wellhead sealing device, installation method and system - Google Patents
Wellhead sealing device, installation method and system Download PDFInfo
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- CN111305785A CN111305785A CN201811516430.3A CN201811516430A CN111305785A CN 111305785 A CN111305785 A CN 111305785A CN 201811516430 A CN201811516430 A CN 201811516430A CN 111305785 A CN111305785 A CN 111305785A
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- hole
- cable
- sealing
- assembly
- wellhead
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
Abstract
The application discloses a wellhead sealing device, an installation method and a system, and belongs to the field of oil exploitation. The device comprises: the sealing pipe column is provided with a first through hole, the first end of the sealing pipe column is used for being connected with a connecting pipe, the connecting pipe is provided with a second through hole, the first through hole and the second through hole are communicated with an annulus in a target well, and the first through hole is used for allowing a cable to pass through; the sealing pipe column is provided with a first area and a second area which are sequentially arranged along the direction far away from the first end, and the aperture of the first through hole in the first area is smaller than that of the first through hole in the second area; along the direction of keeping away from first end, elastic seal circle sets gradually in being located the first through-hole in the second region with the jam subassembly, and the jam subassembly has the third through-hole that is used for the cable to pass through. The relatively poor problem of leakproofness of oil well among the correlation technique has been solved to this application, and this application is used for sealing the well head.
Description
Technical Field
The application relates to the field of oil exploitation, in particular to a wellhead sealing device, an installation method and a system.
Background
In the oil exploitation process, electric equipment (such as an oil well pump, a pressure gauge and the like) in an oil well needs to be connected with a distribution box on the ground through a cable. Also, in order to prevent the cable from being worn, the cable is generally an armored cable. The armored cable is formed by arranging a conductor in a metal sleeve with an insulating material.
In the correlation technique, usually need be connected the one end of armor cable with the consumer earlier, then will connect the armor cable and the consumer after transfer to the oil well in, later with the other end of armor cable pass annular space (being the annular space) between oil pipe and the sleeve pipe in proper order, with the connecting pipe of annular space intercommunication and with the metal sealing lid that the connecting pipe is connected, and then be connected with the block terminal on ground. Also, during oil production, there is typically gas separated from the oil in the annulus. The gas may be, for example, natural gas or gas.
Because the metal sealing cover and the armored cable are both made of metal materials, a gap is easy to exist between the metal sealing cover and the armored cable, and the sealing performance of the oil well is poor. Therefore, the gas in the annular space is easy to leak into the air, which causes air pollution and energy waste.
Disclosure of Invention
The application provides a wellhead sealing device, an installation method and a system, which can solve the problem of poor sealing performance of an oil well in the related technology, and the technical scheme is as follows:
in one aspect, a wellhead sealing device is provided, comprising: a sealing pipe column, an elastic sealing ring and a blocking component,
the sealing pipe column is provided with a first through hole, the first end of the sealing pipe column is used for being connected with a connecting pipe, the connecting pipe is provided with a second through hole, the first through hole and the second through hole are communicated with an annulus in a target well, and the first through hole is used for allowing a cable to pass through;
along the direction far away from the first end, the sealing pipe column is provided with a first area and a second area which are sequentially arranged, and the aperture of a first through hole in the first area is smaller than that of a first through hole in the second area;
along keeping away from the direction of first end, the elasticity sealing washer with it sets gradually to block up the subassembly and is being located in the second region in the first through-hole, it has the confession to block up the subassembly the third through-hole that the cable passes through, block up the subassembly with sealed tubular column can dismantle the connection, just it is used for the extrusion to block up the subassembly the elasticity sealing washer, sealed tubular column, by extruded elasticity sealing washer with it is right to block up the subassembly the annular space seals.
Optionally, the wellhead sealing device further comprises: a first fall arrest assembly, the cable comprising: the cable comprises a cable core, a first protective sleeve wrapping the cable core and a second protective sleeve wrapping the first protective sleeve;
when the cable passes through the first through hole through the connecting pipe, the first anti-falling assembly is positioned in the first through hole, the first anti-falling assembly is positioned between the connecting pipe and the elastic sealing ring, and the first anti-falling assembly is arranged between the first protective sleeve and the second protective sleeve;
the first width of the first anti-falling assembly is larger than the aperture of the second through hole, and the direction of the first width is perpendicular to the extending direction of the first through hole.
Optionally, the sealing string further has a third area, the third area is located on one side of the first area close to the first end, and the aperture of the first through hole located in the third area is larger than the aperture of the first through hole located in the first area.
Optionally, the cable comprises: the cable core, the parcel the first protective sheath of cable core, and the parcel the second protective sheath of first protective sheath, well head sealing device still includes: the hollow pipe, the second anti-falling component and the third anti-falling component;
one end of the hollow pipe, which is far away from the first end, is positioned in the connecting pipe;
the hollow pipe is fixedly connected with the third anti-falling component, the third anti-falling component is positioned between the connecting pipe and the elastic sealing ring, the second width of the third anti-falling component is greater than the aperture of the second through hole, and the direction of the second width is perpendicular to the extending direction of the first through hole;
when the cable by the connecting pipe passes when first through-hole, the subassembly is prevented weighing down by the second is located inside the first through-hole, the subassembly setting is prevented weighing down by the second is in first protective sheath with between the second protective sheath, just the third width that the subassembly was prevented weighing down by the second is greater than the internal diameter of hollow tube, the direction perpendicular to at third width place the extending direction of first through-hole.
Optionally, the interior of the hollow tube has a boss, the third width of the second fall arrest assembly is greater than the width of the gap defined by the boss, the third width of the second fall arrest assembly is less than the interior diameter of the hollow tube;
the wellhead sealing device further comprises: and the pressing cap is fixedly connected with the inner wall of the hollow pipe, the pressing cap is positioned on one side of the elastic sealing ring, which is close to the second anti-falling assembly, and the pressing cap is provided with a fifth through hole for the cable to pass through.
Optionally, the third width of the second fall arrest assembly is less than the outer diameter of the hollow tube;
the wellhead sealing device further comprises: and the pressing cap is fixedly connected with the outer wall of the hollow pipe, the pressing cap is positioned on one side of the elastic sealing ring, which is close to the second anti-falling assembly, and the pressing cap is provided with a fifth through hole for the cable to pass through.
Optionally, the wellhead sealing device further comprises: a support ring is arranged on the upper portion of the support ring,
the support ring is located in the second region, and is located the elastic sealing ring is close to one side of first end, the aperture of support ring is greater than or equal to the aperture of elastic sealing ring, the first side of support ring be used for with sealed tubular column contact, the second side of support ring be used for with the elastic sealing ring contact, the first side with the second side is relative.
Optionally, the wellhead sealing device further comprises: the protective cover, the protective cover cup joints the outside of the second end of sealed tubular column, the protective cover is gone up and is had the fourth through-hole that the power cable passed, the second end with first end is relative.
Optionally, one end of the plugging assembly is provided with an external thread, and the contact surface of the sealing string and the plugging assembly is provided with an internal thread meshed with the external thread.
Optionally, an end of the occluding component distal to the first end has a grip,
when the elastic sealing ring is in a squeezed state, the grip part is positioned outside the sealing pipe column;
or when the elastic sealing ring is in a pressed state, the grip part is positioned in the sealing pipe column, and a gap exists between the grip part and the inner wall of the sealing pipe column.
Optionally, the outer diameter of the sealing string in the second zone is smaller than the outer diameter of the sealing string in the first zone.
In another aspect, a wellhead sealing system is provided, the system comprising: a wellhead sealing device as claimed in any one of claims 1 to 11.
Optionally, the system further comprises: a wellhead device is arranged on the well head,
the wellhead assembly includes: the connecting pipe, the connecting pipe has the second through-hole, the second through-hole is used for the cable to pass through, well head sealing device with the connecting pipe is connected.
In yet another aspect, a method of installing a wellhead sealing device is provided, the method comprising:
the cable penetrating out of the connecting pipe penetrates through a first through hole of the sealing pipe column;
the cable passing through the first through hole passes through the elastic sealing ring;
disposing the elastomeric seal ring within a first through-hole located in the second region;
fixedly connecting the first end of the sealing pipe column with the connecting pipe;
passing the cable through a plugging assembly;
and fixedly connecting the plugging component with the sealing pipe column to enable the plugging component to extrude the elastic sealing ring, wherein the sealing pipe column, the extruded elastic sealing ring and the plugging component are used for sealing the annular space.
Optionally, the wellhead sealing device further comprises: hollow tube, second are prevented weighing down subassembly and third prevent weighing down the subassembly, the cable includes: the method comprises the following steps that a cable core, a first protective sleeve wrapping the cable core and a second protective sleeve wrapping the first protective sleeve are arranged, and before a cable which penetrates out of a connecting pipe sequentially passes through a first through hole of a sealing pipe column, the method further comprises the following steps:
the cable which is penetrated out from the connecting pipe passes through the hollow pipe;
clamping the second anti-falling assembly between the first protective sleeve and the second protective sleeve;
passing the cable through the third sinker assembly;
and fixedly connecting the third plummet assembly with the hollow pipe.
Optionally, the wellhead sealing device further comprises: a first fall arrest assembly, the cable comprising: the method comprises the following steps that a cable core, a first protective sleeve wrapping the cable core and a second protective sleeve wrapping the first protective sleeve are arranged, and before a cable which penetrates out of a connecting pipe sequentially passes through a first through hole of a sealing pipe column, the method further comprises the following steps:
and clamping the first anti-falling assembly between the first protective sleeve and the second protective sleeve.
The beneficial effect that technical scheme that this application provided brought includes at least:
the application provides a well head sealing device, installation method and system, in the well head sealing device, the aperture that is located the first through-hole in the first region is less than the aperture that is located the first through-hole in the second region, and elastic seal circle and stopper subassembly set gradually in the first through-hole that is located the second region, so, after the cable passed elastic seal circle, can block up subassembly extrusion elastic seal circle through the control, make elastic seal circle take place elastic deformation, with the clearance between sealed cable and the well head sealing device, and then through sealed tubular column, by extruded elastic seal circle and then block up the subassembly and seal the annular space, compare in correlation technique, the leakproofness of oil well has been improved, gas leakage in the annular space has been prevented to the air.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of an application scenario involving a wellhead sealing device provided by an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a wellhead sealing device provided by an embodiment of the invention;
FIG. 3 is a schematic diagram of another wellhead sealing device according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of yet another wellhead sealing device provided by an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of yet another wellhead sealing device provided by an embodiment of the invention;
FIG. 6 is a schematic diagram of a structure of yet another wellhead sealing device provided by an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of yet another wellhead sealing device provided by an embodiment of the invention;
FIG. 8 is a schematic cross-sectional view of the wellhead sealing device of FIG. 7 at PP';
FIG. 9 is a flow chart of a method of installing a wellhead sealing device provided by an embodiment of the present invention;
FIG. 10 is a flow chart of another method of installing a wellhead sealing device according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
In order to facilitate understanding of the embodiments of the present invention, a brief description will now be given of an application scenario related to the wellhead sealing device provided by the present invention. For example, as shown in fig. 1, the application scenario may include: casing 02 in formation W, tubing 03, wireline 04, wellhead assembly at the wellhead, and wellhead seal assembly 01 provided by embodiments of the present invention. Wherein, wellhead assembly includes: connecting pipe 05, and connecting pipe 05 has the second through-hole, and this second through-hole can link up with the annular space, and well head sealing device 01 can communicate with connecting pipe 05.
In the related art, a gap is easily formed between the metal sealing cover and the armored cable, so that the sealing performance of the oil well is poor.
Therefore, the embodiment of the invention provides a wellhead sealing device which can improve the sealing performance of an oil well. Fig. 2 is a schematic structural diagram of a wellhead sealing device according to an embodiment of the invention. As shown in fig. 2, the wellhead sealing device 01 may include: a sealing string 011, an elastomeric seal 012, and a plugging assembly 013.
The sealing string 011 has a first through hole (not shown in fig. 2), and the first end a1 of the sealing string 011 is used to connect with a connecting tube shown in fig. 1, the connecting tube has a second through hole (not shown in fig. 2), the first through hole, the second through hole are communicated with an annulus in a target well (not shown in fig. 2), and the first through hole is used for passing a cable.
The sealing string 011 has a first region Q1 and a second region Q2 arranged in this order in the direction X away from the first end a1, and the aperture d1 of the first through hole located in the first region Q1 is smaller than the aperture d2 of the first through hole located in the second region Q2.
In a direction X away from the first end, a resilient sealing washer 012 and a blocking member 013 are in turn arranged in a first through hole in the second region Q2. The blocking member 013 has a third through hole (not labeled in fig. 2) for passing the cable therethrough, wherein the third through hole is in communication with the second through hole. A plugging assembly 013 is removably connected to the sealing string 011 and the plugging assembly 013 is used to squeeze the resilient sealing bead 012. A sealing string 011, a compressed elastomeric seal 012 and a plug assembly 013 are used to seal the annulus. Wherein the hole in the elastic sealing ring 012 is used for the cable C1 to pass through.
In summary, in the wellhead sealing device provided in the embodiment of the present invention, the aperture of the first through hole in the first area is smaller than the aperture of the first through hole in the second area, and the elastic sealing ring and the plugging component are sequentially disposed in the first through hole in the second area, so that after the cable passes through the elastic sealing ring, the elastic sealing ring is pressed by controlling the plugging component to elastically deform the elastic sealing ring, so as to seal a gap between the cable and the wellhead sealing device, and further seal the annulus through the sealing pipe column and the pressed elastic sealing ring.
Alternatively, the blocking assembly 013 can be removably connected to the sealing string 011 in the following manner: the plugging assembly is in threaded connection with the sealing pipe column. Further, one end of the plugging assembly may have external threads, and the contact surface of the sealing string 011 and the plugging assembly 013 may have internal threads for meshing with the external threads. Illustratively, the end of the plugging assembly 013 proximate the first end a1 of the sealing string 011 can be externally threaded, in which case, when it is desired to squeeze the elastomeric seal, the plugging assembly 013 can be rotated along the threads of the threads by rotating the plugging assembly 013, which in turn moves the plugging assembly 013 in a direction proximate the first end a1 of the sealing string to effect squeezing of the elastomeric seal.
Further, fig. 3 is a schematic structural diagram of another wellhead sealing device according to an embodiment of the present invention. As shown in fig. 3, an end of the plugging assembly 013 distal to the first end of the sealing string can have a grip.
Alternatively, the gripping portion may be located outside the sealing string when the elastomeric sealing ring is in a compressed state, as shown in fig. 3. Also, the maximum width M of the blocking member 013 is larger than the aperture d2 of the first through-hole located in the second region Q2. Wherein, the direction of the maximum width M of the blocking member 013 is perpendicular to the extending direction of the first through hole. At this point, the grip 013 on the plugging assembly can be manually rotated to control the movement of the plugging group in a direction toward or away from the first end a1 of the sealing string to install or remove the plugging assembly.
Alternatively, fig. 4 is a schematic structural diagram of another wellhead sealing device according to an embodiment of the present invention. As shown in fig. 4, when the elastic sealing ring is in a compressed state, the grip portion may be located inside the sealing stem, and a gap may exist between the grip portion and the inner wall of the sealing stem 011. At this time, the gripping portion can be gripped by a tool to rotate the plugging assembly, thereby controlling the plugging assembly to move in a direction close to or away from the first end a1 of the sealing string 011.
Optionally, referring to fig. 3 or fig. 4, the wellhead sealing device 01 may further include: support ring 014.
The support ring 014 is located in the second area Q2 and on the side of the elastic sealing ring 012 close to the first end a1 of the sealing post 011. The support ring 014 has a bore diameter greater than or equal to that of the elastic sealing ring 012, a first side of the support ring 014 being adapted to contact the sealing post 011 and a second side of the support ring 014 being adapted to contact the elastic sealing ring 012, the first side being opposite to the second side. For example, as shown in fig. 3 or fig. 4, the side of the support ring 014 near the first end a1 of the seal string 011 can be a first side of the support ring 014, and the side of the support ring 014 away from the first end a1 of the seal string 011 can be a second side of the support ring 014.
Alternatively, when the elastic packing 012 is pressed by the plug member 013, the elastic packing 012 contacts the second side of the backup ring 014, so the backup ring 014 can ensure that the elastic packing 012 can be deformed in a predetermined deformation manner after being pressed, thereby improving the sealing effect of the elastic packing. For example, the elastic sealing ring 012 may be deformed in a predetermined manner: the length of the elastic sealing ring is reduced, and the thickness between the inner diameter and the outer diameter of the elastic sealing ring is increased. The length direction is parallel to the extending direction of the first through hole, and the thickness direction is perpendicular to the extending direction of the first through hole. In this way, the clearance between the elastic sealing ring and the cable and between the elastic sealing ring and the support ring 014 is small.
Alternatively, as shown in fig. 3, the shape of the support ring 014 may be a sheet structure with the same thickness at the ring periphery and the ring center, or, as shown in fig. 4, the shape of the support ring 014 may also be a sheet structure with the ring periphery thicker than the ring center, which is not limited by the embodiment of the invention. When the circumference of the support ring 014 is thicker than the center of the ring, the elastic sealing ring is more easily deformed toward the center of the ring after being pressed, thereby further improving the sealing effect of the elastic sealing ring.
Alternatively, the material of the support ring 014 may be a metal material, such as copper and iron, which is not limited by the embodiment of the invention. When the material of the support ring is copper, the support ring can also be called a copper pad.
Optionally, with continued reference to fig. 3 or 4, the wellhead sealing device 01 may further include: a protective cover 015. The protecting cover 015 is sleeved outside the second end A2 of the sealing string 011, a fourth through hole for a cable to pass through is formed in the protecting cover 015, and the second end A2 of the sealing string 011 is opposite to the first end A1 of the sealing string 011.
The inner wall of the shield cap 015 may have an internal thread and the outer wall of the second end of the sealing string 011 may have an external thread for engaging the internal thread. In this way, the protective cover can be screwed with the second end a2 of the sealing string, facilitating the installation and removal of the protective cover. The protective cover can be used for preventing dust or rainwater from entering the sealing pipe column, and further prevents blockage between the blocking assembly and the sealing pipe column due to sundries or rusting, and further prevents the occurrence of the condition that the blocking assembly cannot be disassembled.
Optionally, with continued reference to fig. 3 or 4, the outer diameter of the sealing string 011 located in the second zone Q2 can be smaller than the outer diameter of the sealing string located in the first zone Q1. That is, the outer surface of the sealing device can be in a step shape, so that raw materials required in the sealing pipe column can be reduced, the manufacturing cost of the sealing pipe column is reduced, and the manufacturing cost of the wellhead sealing device is further reduced.
Optionally, with continued reference to fig. 3 or 4, the sealing string 011 can also have a third region Q3. The third area Q3 is located at a side of the first area Q1 close to the first end a1 of the sealing string, and the aperture of the first through hole located at the third area Q3 may be larger than that of the first through hole located at the first area Q1.
Optionally, the wellhead sealing device may also have the function of preventing the wireline from falling. The implementation manner of the function can be various, and the following implementation manners are taken as examples to illustrate the embodiment of the invention:
in a first implementation, the wellhead sealing device may further include: a first fall arrest assembly. FIG. 5 is a schematic view of the wellhead sealing device 01 shown in FIG. 3 further including a first fall arrest assembly 016. As shown in fig. 5, cable C1 may include: a cable core C2, a first protective sheath (not shown in fig. 5) surrounding the cable core, and a second protective sheath C3 surrounding the first protective sheath. Alternatively, the protective sleeve may be made of an insulating material having good ductility, such as rubber and polyethylene materials. Alternatively, the cable may be an armoured cable, in which case the first protective sheath may be the inner armour of the cable and the second protective sheath may be the outer armour of the cable.
When cable C1 passes through first through-hole by the connecting pipe, first subassembly 016 of preventing weighing down can be located inside first through-hole, and first subassembly 016 of preventing weighing down can be located between connecting pipe and elastic sealing ring 012, and first subassembly 016 of preventing weighing down can set up between first protective sheath and second protective sheath C3.
The first width K1 of the first anti-fall component 016 can be larger than the hole diameter d3 of the second through hole of the connecting tube. The first width K1 is in a direction perpendicular to the extending direction of the first via. Because the first width of the first anti-falling assembly is larger than the second through hole of the connecting pipe, the first anti-falling assembly can be clamped at the port of the connecting pipe. And when the first anti-falling assembly is arranged between the first protective sleeve and the second protective sleeve, the cable positioned at the position provided with the first anti-falling assembly can be clamped at the port of the connecting pipe, so that the cable section positioned outside the connecting pipe is prevented from falling into the connecting pipe due to the action of gravity.
Optionally, in a case that the cable includes a cable core, a first protective sheath and a second protective sheath, when the cable needs to pass through the first through hole of the sealing pipe column, the entire cable may pass through the first through hole, or the cable core after the first protective sheath and the second protective sheath are peeled off may also pass through the first through hole, which is not limited in the embodiment of the present invention.
When the first protective sleeve and the second protective sleeve of the cable need to be stripped and the cable is an armored cable, the second protective sleeve can be stripped and cut off, and then the first protective sleeve is reserved for 1 cm more than the second protective sleeve (the length can be adjusted according to actual needs), and then the first protective sleeve is also stripped and cut off. And then reversely bending the first protective sleeve with the reserved length of 1 cm to cover the fracture position of the second protective sleeve, and binding the first protective sleeve by using a thin iron wire to prevent the fracture of the first protective sleeve and the second protective sleeve from damaging the cable core.
In a second implementation, the wellhead sealing devices may each further include: hollow tube, second prevent weighing down subassembly and third prevent weighing down the subassembly. And the cable can be fixed by the hollow tube under at least two conditions:
in the first case, the cable may be secured using a port of the hollow tube distal to the first end a 1.
FIG. 6 is a schematic structural diagram of the wellhead sealing device 01 shown in FIG. 3 further including a hollow tube 017, a second fall prevention assembly 018, and a third fall prevention assembly 019. As shown in fig. 6, the cable may include: a cable core C2, a first protective sheath (not shown in fig. 6) surrounding the cable core, and a second protective sheath C3 surrounding the first protective sheath.
Wherein, the one end that the first end A1 of sealing tubular column 011 was kept away from to hollow tube 017 can be located the inside of connecting pipe, and hollow tube 017 can weigh down subassembly 019 fixed connection with the third. The third anti-dropping component 019 is located between the connecting pipe and the elastic sealing ring 012, and the second width K2 of the third anti-dropping component 019 is greater than the aperture d4 of the second through hole, and the direction of the second width K2 is perpendicular to the extending direction of the first through hole. Because the second width that the third prevents weighing down the subassembly is greater than the aperture of the second through-hole of connecting pipe, consequently, the third prevents weighing down the subassembly and can block outside the port that the connecting pipe is close to elastic seal circle. When the third anti-dropping component is fixedly connected with the hollow pipe, the hollow pipe can be clamped at the port of the connecting pipe, and the hollow pipe is prevented from dropping into the connecting pipe due to the action of gravity.
Optionally, the inner wall of the third weight prevention assembly may have an internal thread, the outer wall of the hollow tube may have an external thread for engaging with the internal thread, and the third weight prevention assembly and the hollow tube may be threadedly connected through the internal thread and the external thread.
When a cable passes through the first through hole of the sealing pipe column 011 through a connecting pipe, the second anti-falling assembly 018 can be positioned inside the first through hole, the second anti-falling assembly 018 can be arranged between the first protective sleeve and the second protective sleeve C3, the third width of the second anti-falling assembly 018 is larger than the inner diameter of the hollow pipe, and the direction of the third width is perpendicular to the extending direction of the first through hole. For example, referring to FIG. 6, the third width K3 of the second fall arrest assembly 018 can be less than the outer diameter d5 of the hollow tube 017 and greater than the inner diameter of the hollow tube 017. And when the second anti-falling assembly 018 is arranged between the first protective sleeve and the second protective sleeve C3, the cable at the position where the second anti-falling assembly 018 is arranged can be clamped at the port of the hollow tube 017, and the cable section outside the hollow tube 017 is prevented from falling into the hollow tube 017 due to the action of gravity.
As shown in fig. 6, the wellhead sealing device 01 may further include: and pressing a cap Y, wherein the cap Y is fixedly connected with the outer wall of the hollow tube 017. The pressure cap Y is located on one side of the second anti-falling assembly 018 close to the elastic sealing ring 012, and has a fifth through hole for the cable to pass through. The pressure cap can be used for preventing the cable section in the well from being pulled out so as to ensure the normal operation of electric equipment in the well.
Alternatively, the inner wall of the press cap may have an internal thread, and the outer wall of the hollow tube may have an external thread for engaging with the internal thread, and the press cap and the hollow tube may be screw-coupled through the internal thread and the external thread.
In the second case, a boss may be provided inside the hollow tube, with which the cable is fixed.
Referring to fig. 7, the hollow tube 017 may have bosses therein. The third width K3 of the second fall arrest assembly 018 is greater than the width d6 of the gap defined by the boss, and the third width K3 of the second fall arrest assembly 018 is less than the inner diameter of the hollow tube. Because the third width of the second fall arrest assembly is greater than the width of the gap defined by the boss, the second fall arrest assembly can be clipped onto the boss. When the second anti-falling component is arranged between the first protective sleeve and the second protective sleeve, the cable positioned at the position where the second anti-falling component is arranged can be clamped on the boss, and the cable positioned at one side of the boss close to the elastic sealing ring is prevented from falling to one side of the annular boss far away from the elastic sealing ring due to the action of gravity.
Alternatively, fig. 8 is a schematic cross-sectional view of the wellhead sealing device of fig. 7 at PP', and as shown in fig. 8, the boss inside the hollow tube 017 may be composed of a plurality of raised structures (the boss is exemplified by being composed of two raised structures in fig. 7). Alternatively, the boss may be an annular boss, which is not limited in the embodiment of the present invention.
Optionally, when the boss is an annular boss, the annular boss and the hollow tube may be an integral structure, or the annular boss and the hollow tube may not be an integral structure, which is not limited in the embodiment of the present invention. When the annular boss and the hollow pipe are not of an integrated structure, the annular boss can be fixed in the hollow pipe in a clamping or threaded connection mode.
Optionally, the wellhead sealing device 01 may further include: and pressing a cap Y. Wherein, press cap Y can with the inner wall fixed connection of hollow tube, press cap Y to be located the second and prevent weighing down one side that subassembly 018 is close to elastic seal 012, and press cap Y to have the fifth through-hole that is used for the cable to pass. When the second was prevented weighing down the subassembly and is set up between first protective sheath and second protective sheath, the pressure cap can be used for preventing to be located the cable section in the well and is dragged out to guarantee the consumer normal operating in the well.
Alternatively, the inner wall of the press cap may have an internal thread, and the outer wall of the hollow tube may have an external thread for engaging with the internal thread, and the press cap and the hollow tube may be screw-coupled through the internal thread and the external thread.
In summary, in the wellhead sealing device provided in the embodiment of the present invention, the aperture of the first through hole in the first area is smaller than the aperture of the first through hole in the second area, and the elastic sealing ring and the plugging component are sequentially disposed in the first through hole in the second area, so that after the cable passes through the elastic sealing ring, the elastic sealing ring is pressed by controlling the plugging component to elastically deform the elastic sealing ring, so as to seal a gap between the cable and the wellhead sealing device, and further seal the annulus through the sealing pipe column and the pressed elastic sealing ring.
The embodiment of the invention also provides a wellhead sealing system. The wellhead sealing system may include: a wellhead sealing device as shown in any of figures 2 to 7.
Optionally, the wellhead sealing system may further comprise: a wellhead assembly. Wherein the wellhead assembly may include: the connecting pipe, the connecting pipe can have the second through-hole, and the second through-hole can be used for the cable to pass through, and well head sealing device can be connected with the connecting pipe. Illustratively, the wellhead assembly may be a wellhead spool, and the connection pipe may be a wellhead bypass in the wellhead spool for routing the cable.
In summary, the wellhead sealing system provided by the embodiment of the invention includes the wellhead sealing device, and in the wellhead sealing device, the aperture of the first through hole in the first area is smaller than the aperture of the first through hole in the second area, and the elastic sealing ring and the plugging component are sequentially arranged in the first through hole in the second area, so that after the cable passes through the elastic sealing ring, the elastic sealing ring can be squeezed by controlling the plugging component to elastically deform the elastic sealing ring so as to seal a gap between the cable and the wellhead sealing device, and further the annular space is sealed by the sealing pipe column and the squeezed elastic sealing ring and the plugging component.
FIG. 9 is a flow chart of a method of installing a wellhead seal that may be used to install the wellhead seal described in any of FIGS. 2-7 in accordance with an embodiment of the present invention. As shown in fig. 9, the installation method of the wellhead sealing device may include:
And step 702, the cable passing through the first through hole passes through the elastic sealing ring.
And 703, arranging the elastic sealing ring in the first through hole in the second area.
And 704, fixedly connecting the first end of the sealing pipe column with a connecting pipe.
And 706, fixedly connecting the plugging component with the sealing pipe column to enable the plugging component to extrude the elastic sealing ring, wherein the sealing pipe column, the extruded elastic sealing ring and the plugging component are used for sealing the annular space.
In summary, in the installation method of the wellhead sealing device provided by the embodiment of the invention, the cable transmitted from the connecting pipe sequentially passes through the first through hole and the elastic sealing ring of the sealing pipe column; then set up the elastic sealing ring in being located the first through-hole in the second region, pass merit again and block up the subassembly with the cable to block up subassembly and sealed tubular column fixed connection, make and block up subassembly extrusion elastic sealing ring, and then make sealed tubular column, by extruded elastic sealing ring and block up the subassembly and seal the annular space, compare in correlation technique, improved the sealed of oil well, prevented in the annular space gas leakage to the air.
Optionally, the wellhead sealing device may further comprise: the assembly for preventing the cable from falling can be arranged in various ways, and the embodiment of the invention is described by taking the following implementation modes as examples:
in a first implementable manner, a wellhead sealing device may comprise: hollow tube, second prevent weighing down subassembly and third prevent weighing down the subassembly. The cable may include: the cable core, the first protective sheath of parcel cable core, and the second protective sheath of parcel first protective sheath. FIG. 10 is a flow chart of another method of installing a wellhead sealing device according to an embodiment of the present invention. As shown in fig. 10, prior to step 701, the installation method of the wellhead sealing device may further include:
And step 802, clamping a second anti-falling assembly between the first protective sleeve and the second protective sleeve.
And step 804, fixedly connecting the third plummet assembly with the hollow pipe.
Optionally, in a case that the cable includes a cable core, a first protective sheath and a second protective sheath, when the cable needs to pass through the first through hole of the sealing pipe column, the entire cable may pass through the first through hole, or the cable core after the first protective sheath and the second protective sheath are peeled off may also pass through the first through hole, which is not limited in the embodiment of the present invention.
In the first case of the second achievable way of preventing the cable from falling, the wellhead sealing device may further comprise, when the cable is fixed by the hollow tube: and (6) pressing the cap. At this time, before the cable passes through the first through hole of the sealing pipe column, the cable can firstly pass through the pressing cap, and then the pressing cap through which the cable passes is arranged in the hollow pipe, so that the installation of the wellhead sealing device is realized.
In a first achievable way of preventing the cable from falling, the wellhead sealing device may comprise: the first fall arrest assembly, the cable may include: the cable core, the first protective sheath of parcel cable core, and the second protective sheath of parcel first protective sheath. At this moment, before the cable passes through the first through hole of the sealing pipe column, the first anti-falling assembly can be clamped between the first protective sleeve and the second protective sleeve.
In the second instance of the second achievable way of preventing the cable from falling, the wellhead sealing device may further comprise a pressure cap when the cable is secured by the boss. At this moment, with first prevent weighing down the subassembly joint with the second protective sheath between first protective sheath, can pass the pressure cap earlier with the cable, then will press the outer wall fixed connection of cap and hollow tube to realize well head sealing device's installation.
In summary, in the installation method of the wellhead sealing device provided by the embodiment of the invention, the cable transmitted from the connecting pipe sequentially passes through the first through hole and the elastic sealing ring of the sealing pipe column; then set up the elastic sealing ring in being located the first through-hole in the second region, pass merit again and block up the subassembly with the cable to block up subassembly and sealed tubular column fixed connection, make and block up subassembly extrusion elastic sealing ring, and then make sealed tubular column, by extruded elastic sealing ring and block up the subassembly and seal the annular space, compare in correlation technique, improved the sealed of oil well, prevented in the annular space gas leakage to the air.
The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (16)
1. A wellhead sealing device, characterized in that it comprises: a sealing pipe column, an elastic sealing ring and a blocking component,
the sealing pipe column is provided with a first through hole, the first end of the sealing pipe column is used for being connected with a connecting pipe, the connecting pipe is provided with a second through hole, the first through hole and the second through hole are communicated with an annulus in a target well, and the first through hole is used for allowing a cable to pass through;
along the direction far away from the first end, the sealing pipe column is provided with a first area and a second area which are sequentially arranged, and the aperture of a first through hole in the first area is smaller than that of a first through hole in the second area;
along keeping away from the direction of first end, the elasticity sealing washer with it sets gradually to block up the subassembly and is being located in the second region in the first through-hole, it has the confession to block up the subassembly the third through-hole that the cable passes through, block up the subassembly with sealed tubular column can dismantle the connection, just it is used for the extrusion to block up the subassembly the elasticity sealing washer, sealed tubular column, by extruded elasticity sealing washer with it is right to block up the subassembly the annular space seals.
2. The apparatus of claim 1, wherein the wellhead sealing device further comprises: a first fall arrest assembly, the cable comprising: the cable comprises a cable core, a first protective sleeve wrapping the cable core and a second protective sleeve wrapping the first protective sleeve;
when the cable passes through the first through hole through the connecting pipe, the first anti-falling assembly is positioned in the first through hole, the first anti-falling assembly is positioned between the connecting pipe and the elastic sealing ring, and the first anti-falling assembly is arranged between the first protective sleeve and the second protective sleeve;
the first width of the first anti-falling assembly is larger than the aperture of the second through hole, and the direction of the first width is perpendicular to the extending direction of the first through hole.
3. The apparatus of claim 2, wherein the sealing string further has a third region located on a side of the first region near the first end, and wherein the first through hole located in the third region has a larger aperture than the first through hole located in the first region.
4. The apparatus of claim 1, wherein the cable comprises: the cable core, the parcel the first protective sheath of cable core, and the parcel the second protective sheath of first protective sheath, well head sealing device still includes: the hollow pipe, the second anti-falling component and the third anti-falling component;
one end of the hollow pipe, which is far away from the first end, is positioned in the connecting pipe;
the hollow pipe is fixedly connected with the third anti-falling component, the third anti-falling component is positioned between the connecting pipe and the elastic sealing ring, the second width of the third anti-falling component is greater than the aperture of the second through hole, and the direction of the second width is perpendicular to the extending direction of the first through hole;
when the cable by the connecting pipe passes when first through-hole, the subassembly is prevented weighing down by the second is located inside the first through-hole, the subassembly setting is prevented weighing down by the second is in first protective sheath with between the second protective sheath, just the third width that the subassembly was prevented weighing down by the second is greater than the internal diameter of hollow tube, the direction perpendicular to at third width place the extending direction of first through-hole.
5. The apparatus of claim 4, wherein the interior of the hollow tube has a boss, the second fall arrest assembly has a third width that is greater than a width of a gap defined by the boss, the third width of the second fall arrest assembly is less than an inner diameter of the hollow tube;
the wellhead sealing device further comprises: and the pressing cap is fixedly connected with the inner wall of the hollow pipe, the pressing cap is positioned on one side of the elastic sealing ring, which is close to the second anti-falling assembly, and the pressing cap is provided with a fifth through hole for the cable to pass through.
6. The apparatus of claim 4, wherein the third width of the second fall arrest assembly is less than the outer diameter of the hollow tube;
the wellhead sealing device further comprises: and the pressing cap is fixedly connected with the outer wall of the hollow pipe, the pressing cap is positioned on one side of the elastic sealing ring, which is close to the second anti-falling assembly, and the pressing cap is provided with a fifth through hole for the cable to pass through.
7. The apparatus of any of claims 1 to 6, wherein the wellhead sealing device further comprises: a support ring is arranged on the upper portion of the support ring,
the support ring is located in the second region, and is located the elastic sealing ring is close to one side of first end, the aperture of support ring is greater than or equal to the aperture of elastic sealing ring, the first side of support ring be used for with sealed tubular column contact, the second side of support ring be used for with the elastic sealing ring contact, the first side with the second side is relative.
8. The apparatus of any of claims 1 to 6, wherein the wellhead sealing device further comprises: the protective cover, the protective cover cup joints the outside of the second end of sealed tubular column, the protective cover is gone up and is had the fourth through-hole that the power cable passed, the second end with first end is relative.
9. The apparatus of any one of claims 1 to 6, wherein one end of the obturating assembly is externally threaded and the interface of the sealing string with the obturating assembly is internally threaded for engagement with the external thread.
10. The device of claim 9, wherein an end of the occluding assembly distal to the first end has a grip,
when the elastic sealing ring is in a squeezed state, the grip part is positioned outside the sealing pipe column;
or when the elastic sealing ring is in a pressed state, the grip part is positioned in the sealing pipe column, and a gap exists between the grip part and the inner wall of the sealing pipe column.
11. The apparatus of any one of claims 1 to 6, wherein the outer diameter of the sealing string in the second zone is smaller than the outer diameter of the sealing string in the first zone.
12. A wellhead sealing system, characterized in that the system comprises: a wellhead sealing device as claimed in any one of claims 1 to 11.
13. The system of claim 12, further comprising: a wellhead device is arranged on the well head,
the wellhead assembly includes: the connecting pipe, the connecting pipe has the second through-hole, the second through-hole is used for the cable to pass through, well head sealing device with the connecting pipe is connected.
14. A method of installing a wellhead seal, the method comprising:
the cable penetrating out of the connecting pipe penetrates through a first through hole of the sealing pipe column;
the cable passing through the first through hole passes through the elastic sealing ring;
disposing the elastomeric seal ring within a first through-hole located in the second region;
fixedly connecting the first end of the sealing pipe column with the connecting pipe;
passing the cable through a plugging assembly;
and fixedly connecting the plugging component with the sealing pipe column to enable the plugging component to extrude the elastic sealing ring, wherein the sealing pipe column, the extruded elastic sealing ring and the plugging component are used for sealing the annular space.
15. The method of claim 14, wherein the wellhead sealing device further comprises: hollow tube, second are prevented weighing down subassembly and third prevent weighing down the subassembly, the cable includes: the method comprises the following steps that a cable core, a first protective sleeve wrapping the cable core and a second protective sleeve wrapping the first protective sleeve are arranged, and before a cable which penetrates out of a connecting pipe sequentially passes through a first through hole of a sealing pipe column, the method further comprises the following steps:
the cable which is penetrated out from the connecting pipe passes through the hollow pipe;
clamping the second anti-falling assembly between the first protective sleeve and the second protective sleeve;
passing the cable through the third sinker assembly;
and fixedly connecting the third plummet assembly with the hollow pipe.
16. The method of claim 14, wherein the wellhead sealing device further comprises: a first fall arrest assembly, the cable comprising: the method comprises the following steps that a cable core, a first protective sleeve wrapping the cable core and a second protective sleeve wrapping the first protective sleeve are arranged, and before a cable which penetrates out of a connecting pipe sequentially passes through a first through hole of a sealing pipe column, the method further comprises the following steps:
and clamping the first anti-falling assembly between the first protective sleeve and the second protective sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811516430.3A CN111305785B (en) | 2018-12-12 | 2018-12-12 | Wellhead sealing device, installation method and system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811516430.3A CN111305785B (en) | 2018-12-12 | 2018-12-12 | Wellhead sealing device, installation method and system |
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| CN111305785A true CN111305785A (en) | 2020-06-19 |
| CN111305785B CN111305785B (en) | 2022-05-10 |
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