CN114458215A - Pressure-resistant large-size tail pipe hanger and using method thereof - Google Patents
Pressure-resistant large-size tail pipe hanger and using method thereof Download PDFInfo
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- CN114458215A CN114458215A CN202011299617.XA CN202011299617A CN114458215A CN 114458215 A CN114458215 A CN 114458215A CN 202011299617 A CN202011299617 A CN 202011299617A CN 114458215 A CN114458215 A CN 114458215A
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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
- E21B33/04—Casing heads; Suspending casings or tubings in well heads
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The invention provides a pressure-resistant large-size tail pipe hanger and a using method thereof.A hanging short section adopts a hollow cylindrical structure, a body adopts a hollow cylindrical structure, the body is arranged on the inner surface of the hanging short section through an opening lock ring, a split bearing ring is arranged on the outer wall of the body above the opening lock ring and used for transmitting load, a limiting device is arranged on the outer wall of the body above the split bearing and used for limiting the movement between the body and the hanging short section, a driving ring is arranged on the outer wall of the body below the opening lock ring and connected with the outer wall of the body through a safety pin. The invention can be connected in series on a large-size casing pipe singly or even in multiple, is used for increasing the number of layers of one layer or even multiple layers of casing pipes, solves the problems of complex underground geological structure and narrow operation window during the operation of a high-temperature high-pressure well and an ultra-deep water well in the conventional well body structure, and can bear the operation environment of high pressure at the bottom of a well.
Description
Technical Field
The invention relates to the technical field of petroleum and natural gas drilling equipment, in particular to a pressure-resistant large-size tail pipe hanger and a using method thereof.
Background
At present, a conventional well body structure comprises 4 layers or 5 layers of casing pipes, and when a high-temperature high-pressure well and an ultra-deep well with complex geological conditions and few well facing data are encountered, a large-size tail pipe hanger is used, so that great freedom degree can be provided for development of oil and gas fields, and operation difficulty and operation risk are greatly reduced.
Disclosure of Invention
The invention overcomes the defects in the prior art, and provides a pressure-resistant large-size tail pipe hanger and a using method thereof.
The purpose of the invention is realized by the following technical scheme.
A pressure-resistant large-size tail pipe hanger comprises a hanging short section, a body, a split type bearing ring, an opening locking ring and a driving ring, wherein the hanging short section is of a hollow cylindrical structure, the body is installed on the inner surface of the hanging short section through the opening locking ring, the body is of a hollow cylindrical structure, the split type bearing ring is installed on the outer wall of the body above the opening locking ring and used for transmitting load, a limiting device is installed on the outer wall of the body above the split type bearing ring and used for limiting the movement between the body and the hanging short section, the driving ring is installed on the outer wall of the body below the opening locking ring and connected with the outer wall of the body through a safety pin, and after a service tool connected with the body is acted by a downward force, the driving ring moves downwards to contact with a driving pin arranged on the inner wall of the hanging short section, when the driving ring moves, the safety pin for connecting the driving ring and the body is out of work, the opening locking ring moves downwards along with the body, the opening locking ring is in contact with the guide circulating block arranged on the outer wall of the body, the opening locking ring is embedded into the opening locking ring groove formed in the inner wall of the hanging nipple after expansion and deformation of the opening locking ring, and meanwhile, the limiting device is also embedded into the body limiting groove formed in the inner wall of the hanging nipple so as to realize connection of the hanging nipple and the body.
Hang the inner wall upper portion of nipple joint and form a nipple joint sealing surface, the inclined plane of righting that is used for leading for the body is offered to the head end of nipple joint sealing surface offer and be used for carrying on spacing sealed assembly spacing groove to sealed assembly the tail end of nipple joint sealing surface offer be used for with stop device cooperation and carry out spacing body spacing groove to the body, at the sealed face below of nipple joint hang and offer on the inner wall of nipple joint be used for with the cooperation of open lock ring and can hang the open lock ring groove of body hang the inner wall lower part of nipple joint and be provided with the drive pin that is used for driving the drive ring.
The number of the driving pins is 3, the 3 driving pins are non-uniformly distributed on the lower portion of the inner wall of the hanging short section, and gaps between the adjacent driving pins can allow blades of five-blade diamond drill bits and six-blade diamond drill bits to pass through.
The inner surface of the body forms a body sealing surface, the head end of the body sealing surface is uniformly provided with an anti-rotation pin slot which is used for matching with an anti-rotation pin of a service tool, a service tool locking ring groove used for being matched with a locking ring of a service tool is arranged on the sealing surface of the body below the anti-rotation pin groove, a sealing assembly sealing surface used for matching a sealing assembly is formed at the upper part of the outer wall of the body, a well cementation circulating groove used for well cementation circulation is arranged on the outer wall of the body below the sealing assembly sealing surface, a bearing inclined plane is formed on the lower surface of the well cementation circulating groove below the mounting hole of the limiting device, the bearing inclined plane is used for being matched with the split type bearing ring to achieve the purpose of load transmission, the guide circulating block is arranged on the outer wall of the body below the well cementation circulating groove, and a safety pin hole for installing a safety pin is formed in the outer wall of the body below the guide circulating block.
The upper surface of the split bearing ring forms an inclined plane matched with the bearing inclined plane, the upper part of the split bearing ring is provided with a circulation hole which runs through the side wall of the split bearing ring and is used for well cementation circulation, an internal circulation groove is formed in the inner wall of the split bearing ring below the circulation hole, and an external circulation groove is formed in the outer wall of the split bearing ring above the circulation hole.
The inner wall of the opening locking ring forms an expanding contact surface used for being contacted with the guide circulating block, and the outer wall of the opening locking ring forms a locking ring surface used for being matched with the opening locking ring groove.
Safety pin threaded holes for mounting safety pins are uniformly formed in the outer wall of the driving ring, and the safety pin threaded holes penetrate through the outer wall of the driving ring.
A use method of a pressure-resistant large-size tail pipe hanger comprises the following steps:
welding two ends of the hanging short section with an outer casing in a welding workshop, connecting the outer casing welded with the hanging short section with an outer casing string after the outer casing is transported to a drill floor to obtain the outer casing provided with the hanging short section and the outer casing string, and installing the outer casing on the seabed by using a piling method, a well drilling and cementing method or a jet drilling method;
step 2, installing the body and the inner casing string by the service tool:
in a welding workshop, welding a body on an inner sleeve horizontally placed, welding one end of the body and one end of the inner sleeve, installing a split type bearing ring, a limiting device and an opening locking ring on the outer wall of the body, transporting the inner sleeve welded with the body to a drill floor, connecting the inner sleeve welded with the body and an inner sleeve string with required length, sitting a slip on a rotary table surface, penetrating a service tool and an inner tube string into the body, rotating the service tool to lock the service tool with a service tool locking ring groove on the body, connecting a drill rod to the service tool, conveying the service tool, the body and the inner sleeve string to a hanging short section by using the drill rod, adjusting the height of the hanging short section, sitting the body on the hanging short section to release certain weight, moving a driving ring downwards to contact with a driving pin, and disabling a safety pin which is connected between the body and the driving ring and plays a temporary connection role, the opening locking ring is contacted with the guide circulating block, the opening locking ring expands and deforms and is embedded into the opening locking ring groove, the limiting device is embedded into the body limiting groove, the connection of the body and the hanging short section is confirmed by increasing a certain force, the service tool is separated from the body by rotating the service tool, circulation and well cementation operations are carried out as required, and then the drill rod, the service tool and the inner pipe string are recovered to the drill floor;
after the operation is accomplished, need cut the well head and retrieve, when hanging the nipple joint degree of depth and surpassing 4 meters below the mud face, only need retrieve the outer sleeve pipe that hangs more than the nipple joint, when the operation depth of water surpassed 800 meters, the sleeve pipe can not retrieve.
In step 3, the recovery mode of the large-size tail pipe hanger is a one-time recovery large-size tail pipe hanger mode, a staged recovery large-size tail pipe hanger mode and a recovery outer casing pipe only mode:
mode one, a large-size tail pipe hanging mode is recovered in one-step mode:
connecting a large-size hydraulic cutting knife capable of cutting 2 or more than 2 layers of sleeves on a drill floor, performing function test on the hydraulic cutting knife, connecting a drill rod on the hydraulic cutting knife, lowering the hydraulic cutting knife to a preset cutting depth below a body, cutting the sleeves, recovering the drill rod and the hydraulic cutting knife to the drill floor after the outermost sleeve is cut off, then lowering a large-size sleeve fishing spear for fishing the outermost sleeve, connecting the drill rod, sending the large-size sleeve fishing spear to a specified operation depth, fishing the outermost sleeve, fishing the drill rod, the large-size sleeve fishing spear, the outermost sleeve welded with a hanging short section and the inner sleeve welded with the body to the drill floor;
and in the second mode, recovering a large-size tail pipe hanging mode in stages:
firstly, connecting a hydraulic cutter capable of cutting 1 layer of inner casing on a drill floor, performing function test on the hydraulic cutter, connecting a drill rod on the hydraulic cutter, sending the hydraulic cutter to a preset cutting depth below a body, cutting the inner casing, recovering the drill rod and the hydraulic cutter to the drill floor after the inner casing is cut off, then lowering a casing fishing spear for fishing the inner casing, connecting the drill rod, sending the casing fishing spear to a specified operation depth, fishing the inner casing, and recovering the drill rod, the casing fishing spear and the inner casing welded with the body to the drill floor;
then, connecting a hydraulic cutter capable of cutting 1 layer of outer casing on a drill floor, performing function test on the hydraulic cutter, connecting a drill rod on the hydraulic cutter, sending the hydraulic cutter to a preset cutting depth, cutting the outer casing, recovering the drill rod and the hydraulic cutter to the drill floor after the outer casing is cut off, then descending a large-size casing fishing spear for fishing the outer casing, connecting the drill rod, sending the large-size casing fishing spear to a specified operation depth, fishing the outer casing, and recovering the drill rod, the large-size casing fishing spear and the outer casing to the drill floor;
mode three, only the outer casing is recovered:
connect the water conservancy cutting knife that can cut 1 layer of outer sleeve pipe at the rig floor, carry out the functional test to the water conservancy cutting knife, connect the drilling rod on the water conservancy cutting knife, send the water conservancy cutting knife to predetermined depth of cut, cut outer sleeve pipe, cut off the back when outer sleeve pipe, retrieve the drilling rod, water conservancy cutting knife to the rig floor, the jumbo size sleeve pipe that is used for salvaging outer sleeve pipe is dragged for the lance again to the lower income, connect the drilling rod, send jumbo size sleeve pipe to drag for the lance to appointed operation degree of depth, salvage outer sleeve pipe, drag for the lance with the drilling rod, jumbo size sleeve pipe, outer sleeve pipe is retrieved to the rig floor.
The beneficial effects of the invention are as follows: the invention can be used for increasing the number of one-layer or even multi-layer casing, reducing the operation difficulty of high-temperature high-pressure wells and ultra-deep wells and increasing the adaptability of underwater wellheads; the hanging nipple is directly welded on the sleeve, and has flexible installation position and strong adaptability; the invention has simple structure and less parts; in the recovery process, the casing connected below the body is fished by using a common fishing tool, the limiting device is sheared by lifting, the recovery of the body and the casing is realized, the operation is simple, the operation tools and the flow are mature, and the reliability is high; the invention can bear the operation environment of high pressure at the bottom of the well.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of a suspended short joint in the invention;
FIG. 3 is a diagram showing the relative positions of the drive pin and the profile of a five-bladed drill according to the present invention;
FIG. 4 is a diagram of the relative positions of the drive pin and six-bladed bit profile of the present invention;
FIG. 5 is a superimposed view of the relative positions of the driving pin with respect to the contour lines of the five-blade bit and the six-blade bit according to the present invention;
FIG. 6 is a schematic structural view of the body of the present invention;
FIG. 7 is a schematic structural view of a split load ring of the present invention;
FIG. 8 is a schematic view of the open lock ring of the present invention;
FIG. 9 is a schematic view of the structure of the drive ring in the present invention;
in the figure: 1 is a hanging short section, 101 is a righting inclined plane, 102 is a sealing assembly limiting groove, 103 is a short section sealing surface, 104 is a body limiting groove, 105 is an open locking ring groove, 106 is a driving pin, 2 is a body, 207 is an anti-rotating pin groove, 208 is a body sealing surface, 209 is a service tool locking ring groove, 210 is a sealing assembly sealing surface, 211 is a limiting device mounting hole, 212 is a bearing inclined plane, 213 is a well cementation circulating groove, 214 is a guide circulating block, 215 is a safety pin hole, 3 is a limiting device, 4 is a split type bearing ring, 416 is an inclined plane, 417 is a circulating hole, 418 is an internal circulating groove, 419 is an external circulating groove, 5 is an open locking ring, 520 is an expansion contact surface, 521 is a locking ring surface, 6 is a driving ring, 622 is a safety pin threaded hole, and 7 is a safety pin.
For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific examples.
Example one
A pressure-resistant large-size tail pipe hanger comprises a hanging short section 1, a body 2, a split type bearing ring 4, an opening locking ring 5 and a driving ring 6, wherein the hanging short section 1 is of a hollow cylindrical structure, the body 2 is installed on the inner surface of the hanging short section 1 through the opening locking ring 5, the split type bearing ring 4 is installed on the outer wall of the body 2 above the opening locking ring 5, the split type bearing ring 4 is used for transmitting load, a limiting device 3 is installed on the outer wall of the body above the split type bearing ring 4, the limiting device 3 is used for limiting the movement between the body 2 and the hanging short section 1, the driving ring 6 is installed on the outer wall of the body 2 below the opening locking ring 5, the driving ring 6 is connected with the outer wall of the body 2 through a safety pin 7, after a service tool connected with the body 2 is acted by a downward force, the driving ring 6 moves downwards to contact with a driving pin 106 arranged on the inner wall of the hanging short section 1, when the driving ring 6 moves, the safety pin 7 for connecting the driving ring 6 and the body 2 fails, the opening locking ring 5 moves downwards along with the body 1, the opening locking ring 5 is in contact with the guide circulating block 214 arranged on the outer wall of the body 2, so that the opening locking ring 5 is embedded into the opening locking ring groove 105 arranged on the inner wall of the hanging short section 1 after being expanded and deformed, and meanwhile, the limiting device 3 is also embedded into the body limiting groove 104 arranged on the inner wall of the hanging short section 1, so that the connection between the hanging short section 1 and the body 2 is realized.
Example two
On the basis of embodiment one, form a nipple joint sealing surface 103 on the inner wall upper portion that hangs nipple joint 1, the inclined plane 101 of rightting that is used for leading for body 2 is offered to the head end of nipple joint sealing surface 103, offer at the middle part of nipple joint sealing surface 103 and be used for carrying on spacing sealed assembly spacing groove 102 to sealed assembly, offer at the tail end of nipple joint sealing surface 103 and be used for cooperating with stop device 3 and carrying on spacing body 104 to body 2, offer on the inner wall of hanging nipple joint 1 that hangs the nipple joint sealing surface 103 below and be used for cooperating with opening catch 5 and can hang body 2 opening catch groove 105, be provided with the drive pin 106 that is used for driving drive ring 6 in the inner wall lower part that hangs nipple joint 1.
The number of the driving pins 106 is 3, the 3 driving pins 106 are non-uniformly distributed on the lower portion of the inner wall of the hanging short section 1, and the gaps between the adjacent driving pins 106 can allow blades of five-blade diamond bits and six-blade diamond bits to pass through.
The inner surface of the body 2 forms a body sealing surface 208, the head end of the body sealing surface 208 is uniformly provided with an anti-rotation pin slot 207 for matching with an anti-rotation pin of a service tool, a service tool locking ring groove 209 used for being matched with a locking ring of a service tool is arranged on the sealing surface 208 of the body below the anti-rotation pin groove 207, a seal assembly sealing surface 210 for seal assembly engagement is formed at an upper portion of the outer wall of the body 2, a cementing circulation groove 213 for a cementing cycle is provided at an outer wall of the body 2 below the sealing surface 210 of the sealing assembly, a bearing inclined plane 212 is formed on the lower surface of the cementing circulation groove 213 below the limiting device mounting hole 211, the bearing inclined plane 212 is used for matching with the split type bearing ring 4 to realize the purpose of load transmission, the guide circulation block 214 is arranged on the outer wall of the body 2 below the cementing circulation groove 213, a safety pin hole 215 for installing the safety pin 7 is opened on the outer wall of the body 2 below the guide circulation block 214.
EXAMPLE III
On the basis of the second embodiment, an inclined plane 416 matched with the bearing inclined plane 212 is formed on the upper surface of the split bearing ring 4, a circulation hole 417 for well cementing circulation is formed on the upper portion of the split bearing ring 4 and penetrates through the side wall of the split bearing ring 4, an internal circulation groove 418 is formed on the inner wall of the split bearing ring 4 below the circulation hole 417, and an external circulation groove 419 is formed on the outer wall of the split bearing ring 4 above the circulation hole 417.
The inner wall of the split locking ring 5 forms an expanding contact surface 520 for contact with the guide circulation block 214, and the outer wall of the split locking ring 5 forms a locking ring surface 521 for mating with the split locking ring groove 105.
Safety pin threaded holes 622 for mounting safety pins 7 are uniformly formed in the outer wall of the driving ring 6, and the safety pin threaded holes 622 penetrate through the outer wall of the driving ring 6.
Example four
A use method of a pressure-resistant large-size tail pipe hanger comprises the following steps:
welding two ends of the hanging short section with an outer casing in a welding workshop, connecting the outer casing welded with the hanging short section with an outer casing string after the outer casing is transported to a drill floor to obtain the outer casing provided with the hanging short section and the outer casing string, and installing the outer casing on the seabed by using a piling method, a well drilling and cementing method or a jet drilling method;
step 2, installing the body and the inner-layer sleeve string by the service tool:
in a welding workshop, welding a body on an inner sleeve horizontally placed, welding one end of the body and one end of the inner sleeve, installing a split type bearing ring, a limiting device and an opening locking ring on the outer wall of the body, transporting the inner sleeve welded with the body to a drill floor, connecting the inner sleeve welded with the body and an inner sleeve string with required length, sitting a slip on a rotary table surface, penetrating a service tool and an inner tube string into the body, rotating the service tool to lock the service tool with a service tool locking ring groove on the body, connecting a drill rod to the service tool, conveying the service tool, the body and the inner sleeve string to a hanging short section by using the drill rod, adjusting the height of the hanging short section, sitting the body on the hanging short section to release certain weight, moving a driving ring downwards to contact with a driving pin, and disabling a safety pin which is connected between the body and the driving ring and plays a temporary connection role, the opening locking ring is contacted with the guide circulating block, the opening locking ring expands and deforms and is embedded into the opening locking ring groove, the limiting device is embedded into the body limiting groove, the connection of the body and the hanging short section is confirmed by increasing a certain force, the service tool is separated from the body by rotating the service tool, circulation and well cementation operations are carried out as required, and then the drill rod, the service tool and the inner pipe string are recovered to the drill floor;
after the operation is accomplished, need cut the well head and retrieve, when hanging the nipple joint degree of depth and surpassing 4 meters below the mud face, only need retrieve the outer sleeve pipe that hangs more than the nipple joint, when the operation depth of water surpassed 800 meters, the sleeve pipe can not retrieve.
In step 3, the recovery mode of the large-size tail pipe hanger is a one-time recovery large-size tail pipe hanger mode, a staged recovery large-size tail pipe hanger mode and a recovery outer casing pipe only mode:
mode one, a large-size tail pipe hanging mode is recovered in one-step mode:
connecting a large-size hydraulic cutter capable of cutting 2 or more than 2 layers of sleeves on a drill floor, performing function test on the hydraulic cutter, connecting a drill rod on the hydraulic cutter, lowering the hydraulic cutter to a preset cutting depth below a body, cutting the sleeves, recovering the drill rod and the hydraulic cutter to the drill floor after the outermost sleeve is cut off, then lowering a large-size sleeve spear for fishing the outermost sleeve, connecting the drill rod, sending the large-size sleeve spear to a specified operation depth, fishing the outermost sleeve, recovering the drill rod, the large-size sleeve spear, the outermost sleeve welded with a hanging short joint and the inner sleeve welded with the body to the drill floor;
and in the second mode, recovering a large-size tail pipe hanging mode in stages:
firstly, connecting a hydraulic cutter capable of cutting 1 layer of inner casing on a drill floor, performing function test on the hydraulic cutter, connecting a drill rod on the hydraulic cutter, sending the hydraulic cutter to a preset cutting depth below a body, cutting the inner casing, recovering the drill rod and the hydraulic cutter to the drill floor after the inner casing is cut off, then lowering a casing fishing spear for fishing the inner casing, connecting the drill rod, sending the casing fishing spear to a specified operation depth, fishing the inner casing, and recovering the drill rod, the casing fishing spear and the inner casing welded with the body to the drill floor;
then, connecting a hydraulic cutter capable of cutting 1 layer of outer casing on a drill floor, performing function test on the hydraulic cutter, connecting a drill rod on the hydraulic cutter, sending the hydraulic cutter to a preset cutting depth, cutting the outer casing, recovering the drill rod and the hydraulic cutter to the drill floor after the outer casing is cut off, then descending a large-size casing fishing spear for fishing the outer casing, connecting the drill rod, sending the large-size casing fishing spear to a specified operation depth, fishing the outer casing, and recovering the drill rod, the large-size casing fishing spear and the outer casing to the drill floor;
mode three, only the outer casing is recovered:
connect the water conservancy cutting knife that can cut 1 layer of outer sleeve pipe at the rig floor, carry out the functional test to the water conservancy cutting knife, connect the drilling rod on the water conservancy cutting knife, send the water conservancy cutting knife to predetermined depth of cut, cut outer sleeve pipe, cut off the back when outer sleeve pipe, retrieve the drilling rod, water conservancy cutting knife to the rig floor, the jumbo size sleeve pipe that is used for salvaging outer sleeve pipe is dragged for the lance again to the lower income, connect the drilling rod, send jumbo size sleeve pipe to drag for the lance to appointed operation degree of depth, salvage outer sleeve pipe, drag for the lance with the drilling rod, jumbo size sleeve pipe, outer sleeve pipe is retrieved to the rig floor.
Spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used in the embodiments for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.
The present invention has been described in detail, but the above description is only a preferred embodiment of the present invention, and is not to be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (10)
1. The utility model provides a withstand voltage type jumbo size tailpiece hanger which characterized in that: the hanging short section is of a hollow cylindrical structure, the body is arranged on the inner surface of the hanging short section through the opening locking ring, the body is of a hollow cylindrical structure, the split type bearing ring is arranged on the outer wall of the body above the opening locking ring and used for transmitting load, a limiting device is arranged on the outer wall of the body above the split type bearing ring and used for limiting the movement between the body and the hanging short section, a driving ring is arranged on the outer wall of the body below the opening locking ring and connected with the outer wall of the body through a safety pin, and after a service tool connected with the body is acted by a downward force, the driving ring moves downwards to contact with a driving pin arranged on the inner wall of the hanging short section, when the driving ring moves, the safety pin for connecting the driving ring and the body is out of work, the opening locking ring moves downwards along with the body, the opening locking ring is in contact with the guide circulating block arranged on the outer wall of the body, the opening locking ring is embedded into the opening locking ring groove formed in the inner wall of the hanging nipple after expansion and deformation of the opening locking ring, and meanwhile, the limiting device is also embedded into the body limiting groove formed in the inner wall of the hanging nipple so as to realize connection of the hanging nipple and the body.
2. The pressure-resistant large-size tail pipe hanger according to claim 1, wherein: hang the inner wall upper portion of nipple joint and form a nipple joint sealing surface, the inclined plane of righting that is used for leading for the body is offered to the head end of nipple joint sealing surface offer and be used for carrying on spacing sealed assembly spacing groove to sealed assembly the tail end of nipple joint sealing surface offer be used for with stop device cooperation and carry out spacing body spacing groove to the body, at the sealed face below of nipple joint hang and offer on the inner wall of nipple joint be used for with the cooperation of open lock ring and can hang the open lock ring groove of body hang the inner wall lower part of nipple joint and be provided with the drive pin that is used for driving the drive ring.
3. The pressure-resistant large-size tail pipe hanger according to claim 2, wherein: the number of the driving pins is 3, the 3 driving pins are non-uniformly distributed on the lower portion of the inner wall of the hanging short section, and gaps between the adjacent driving pins can allow blades of five-blade diamond drill bits and six-blade diamond drill bits to pass through.
4. The pressure-resistant large-size tail pipe hanger according to claim 2, wherein: the inner surface of the body forms a body sealing surface, the head end of the body sealing surface is uniformly provided with an anti-rotation pin slot which is used for matching with an anti-rotation pin of a service tool, a service tool locking ring groove used for being matched with a locking ring of a service tool is arranged on the sealing surface of the body below the anti-rotation pin groove, a sealing assembly sealing surface used for matching a sealing assembly is formed at the upper part of the outer wall of the body, a well cementation circulating groove used for well cementation circulation is arranged on the outer wall of the body below the sealing assembly sealing surface, a bearing inclined plane is formed on the lower surface of the well cementation circulating groove below the mounting hole of the limiting device, the bearing inclined plane is used for being matched with the split type bearing ring to achieve the purpose of load transmission, the guide circulating block is arranged on the outer wall of the body below the well cementation circulating groove, and a safety pin hole for installing a safety pin is formed in the outer wall of the body below the guide circulating block.
5. The pressure-resistant large-size tail pipe hanger according to claim 4, wherein: the upper surface of the split bearing ring forms an inclined plane matched with the bearing inclined plane, the upper part of the split bearing ring is provided with a circulation hole which runs through the side wall of the split bearing ring and is used for well cementation circulation, an internal circulation groove is formed in the inner wall of the split bearing ring below the circulation hole, and an external circulation groove is formed in the outer wall of the split bearing ring above the circulation hole.
6. The pressure-resistant large-size tail pipe hanger according to claim 5, wherein: the inner wall of the opening locking ring forms an expanding contact surface used for being contacted with the guide circulating block, and the outer wall of the opening locking ring forms a locking ring surface used for being matched with the opening locking ring groove.
7. The pressure-resistant large-size tail pipe hanger according to claim 6, wherein: safety pin threaded holes for mounting safety pins are uniformly formed in the outer wall of the driving ring, and the safety pin threaded holes penetrate through the outer wall of the driving ring.
8. A use method of a pressure-resistant large-size tail pipe hanger is characterized by comprising the following steps: the method comprises the following steps:
step 1, pre-installing a hanging nipple and an outer layer sleeve string:
welding two ends of the hanging short section with an outer casing in a welding workshop, connecting the outer casing welded with the hanging short section with an outer casing string after the outer casing is transported to a drill floor to obtain the outer casing provided with the hanging short section and the outer casing string, and installing the outer casing on the seabed by using a piling method, a well drilling and cementing method or a jet drilling method;
step 2, installing the body and the inner-layer sleeve string by the service tool:
in a welding workshop, welding a body on an inner sleeve horizontally placed, welding one end of the body and one end of the inner sleeve, installing a split type bearing ring, a limiting device and an opening locking ring on the outer wall of the body, transporting the inner sleeve welded with the body to a drill floor, connecting the inner sleeve welded with the body and an inner sleeve string with required length, sitting a slip on a rotary table surface, penetrating a service tool and an inner tube string into the body, rotating the service tool to lock the service tool with a service tool locking ring groove on the body, connecting a drill rod to the service tool, conveying the service tool, the body and the inner sleeve string to a hanging short section by using the drill rod, adjusting the height of the hanging short section, sitting the body on the hanging short section to release certain weight, moving a driving ring downwards to contact with a driving pin, and disabling a safety pin which is connected between the body and the driving ring and plays a temporary connection role, the opening locking ring is contacted with the guide circulating block, the opening locking ring expands and deforms and is embedded into the opening locking ring groove, the limiting device is embedded into the body limiting groove, the connection of the body and the hanging short section is confirmed by increasing a certain force, the service tool is separated from the body by rotating the service tool, circulation and well cementation operations are carried out as required, and then the drill rod, the service tool and the inner pipe string are recovered to the drill floor;
step 3, recovering the large-size tail pipe hanger:
after the operation is accomplished, need cut the well head and retrieve, when hanging the nipple joint degree of depth and surpassing 4 meters below the mud face, only need retrieve the outer sleeve pipe that hangs more than the nipple joint, when the operation depth of water surpassed 800 meters, the sleeve pipe can not retrieve.
9. The use method of the pressure-resistant large-size tail pipe hanger according to claim 8, wherein the method comprises the following steps: in step 3, the recovery mode of the large-size tail pipe hanger is a one-step recovery large-size tail pipe hanger mode, a staged recovery large-size tail pipe hanger mode and an outer casing pipe only recovery mode.
10. The use method of the pressure-resistant large-size tail pipe hanger according to claim 9, wherein the method comprises the following steps:
mode one, a large-size tail pipe hanging mode is recovered in one-step mode:
connecting a large-size hydraulic cutting knife capable of cutting 2 or more than 2 layers of sleeves on a drill floor, performing function test on the hydraulic cutting knife, connecting a drill rod on the hydraulic cutting knife, lowering the hydraulic cutting knife to a preset cutting depth below a body, cutting the sleeves, recovering the drill rod and the hydraulic cutting knife to the drill floor after the outermost sleeve is cut off, then lowering a large-size sleeve fishing spear for fishing the outermost sleeve, connecting the drill rod, sending the large-size sleeve fishing spear to a specified operation depth, fishing the outermost sleeve, fishing the drill rod, the large-size sleeve fishing spear, the outermost sleeve welded with a hanging short section and the inner sleeve welded with the body to the drill floor;
and in the second mode, recovering a large-size tail pipe hanging mode in stages:
firstly, connecting a hydraulic cutter capable of cutting 1 layer of inner casing on a drill floor, performing function test on the hydraulic cutter, connecting a drill rod on the hydraulic cutter, sending the hydraulic cutter to a preset cutting depth below a body, cutting the inner casing, recovering the drill rod and the hydraulic cutter to the drill floor after the inner casing is cut off, then lowering a casing fishing spear for fishing the inner casing, connecting the drill rod, sending the casing fishing spear to a specified operation depth, fishing the inner casing, and recovering the drill rod, the casing fishing spear and the inner casing welded with the body to the drill floor;
then, connecting a hydraulic cutter capable of cutting 1 layer of outer casing on a drill floor, performing function test on the hydraulic cutter, connecting a drill rod on the hydraulic cutter, sending the hydraulic cutter to a preset cutting depth, cutting the outer casing, recovering the drill rod and the hydraulic cutter to the drill floor after the outer casing is cut off, then descending a large-size casing fishing spear for fishing the outer casing, connecting the drill rod, sending the large-size casing fishing spear to a specified operation depth, fishing the outer casing, and recovering the drill rod, the large-size casing fishing spear and the outer casing to the drill floor;
mode three, only the outer casing is recovered:
connect the water conservancy cutting knife that can cut 1 layer of outer sleeve pipe at the rig floor, carry out the functional test to the water conservancy cutting knife, connect the drilling rod on the water conservancy cutting knife, send the water conservancy cutting knife to predetermined depth of cut, cut outer sleeve pipe, cut off the back when outer sleeve pipe, retrieve the drilling rod, water conservancy cutting knife to the rig floor, the jumbo size sleeve pipe that is used for salvaging outer sleeve pipe is dragged for the lance again to the lower income, connect the drilling rod, send jumbo size sleeve pipe to drag for the lance to appointed operation degree of depth, salvage outer sleeve pipe, drag for the lance with the drilling rod, jumbo size sleeve pipe, outer sleeve pipe is retrieved to the rig floor.
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| CN202011299617.XA CN114458215B (en) | 2020-11-18 | 2020-11-18 | Pressure-resistant large-size tail pipe hanger and use method thereof |
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| CN114458215B (en) | 2023-09-01 |
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