Suspended anchor channel device and efficient sealed suspended steam injection process string

Abstract

The present application discloses a suspension anchor channel device and a high-efficiency sealed suspension steam injection process string. The suspension anchor channel device is provided with a suspension anchor packer and an elastic packer. The suspension anchor packer is fixed on the inner wall of the casing; the suspension anchor packer is fixed on the inner wall of the casing; one end of the elastic packer is fixed on the suspension anchor packer, and the elastic packer is sleeved on the steam injection pipe; in the steam injection preparation stage, the suspension anchor packer is installed and fixed on the casing by a hand-drop operation, and then the steam injection pipe is lowered into the casing and passes through the elastic packer. Under the action of its own gravity, the steam injection pipe causes the first sealer to press down the elastic packer, so that the inner wall of the elastic packer is tightly fitted with the side of the steam injection pipe, and the elastic packer and the steam injection pipe are sealed; through the above arrangement, the steam injection pipe can be lifted out without obstacles without the need for the packer to release the card, thereby effectively reducing the operation difficulty and operation cost of the steam injection process string.

Description

Technical Field

[0001] The present application belongs to the technical field of heavy oil thermal recovery equipment, and in particular relates to a suspended anchor channel device and a high-efficiency sealed suspended steam injection process column. Background Art

[0002] In the field of thermal recovery of heavy oil in oil fields, for multi-layer heavy oil reservoirs, due to the heterogeneity of the formation, the production degree of each layer is uneven, and the stratified steam injection technology is often used. This technology is to divide the entire well section into several steam injection units, and take one or several groups of oil layers with similar reservoir physical properties as a steam injection unit. Each steam injection unit is separated by a packer set on the steam injection string, so that the steam injection string can be used to inject steam into different oil layers separately to adjust the steam absorption profile of the reservoir, improve the steam injection effect and the utilization rate of the reservoir in the vertical direction. The more mature stratified string structure used in steam drive is the concentric double-tube process string and the eccentric string structure. The concentric stratified steam injection technology has also begun to be developed and gradually applied. At present, China can basically meet the needs of steam drive thermal recovery of medium-deep heavy oil within 1600m.

[0003] The steam injection pipe is provided with a telescopic pipe and a thermal insulator. In the previous gas drive or huff and puff process, especially when intermittent steam injection is involved, during the operation of the steam injection pipe string entering the well, the telescopic pipe is in a fully stretched state under the suspended weight of the steam injection pipe. After the steam injection starts, the temperature gradually rises from top to bottom. After reaching a certain temperature, the thermal packer begins to fit with the inner wall of the casing for sealing; after the steam injection stops, the temperature of the steam injection pipe gradually decreases from top to bottom. According to the principle of thermal expansion and contraction, the part of the steam injection pipe located above the thermal insulator shrinks, and because the telescopic pipe is in a fully stretched state, it cannot continue to stretch to compensate for the shrinkage, so that before the thermal packer is unsealed, the contracted steam injection pipe will drive the unsealed thermal packer to pull the piston upward along the casing, causing the steam injection pipe to deform, the casing structure to be damaged, or the sealing surface of the thermal packer to be damaged and fail. Moreover, the existing steam injection process string requires the packer to release the jamming action before the steam injection pipe can be pulled out. At the same time, due to the high material cost and operation cost of the stratified steam injection string used for steam drive, and the fact that steam throughput wells need to be frequently pulled up and down (due to the need for the insulation pipe arrangement cycle), higher requirements are also put forward for the safety of the lowering and pulling out of the steam injection process string, the success rate of downhole operation measures, convenience, efficiency, low risk, and low cost requirements. Summary of the invention

[0004] The present application aims to at least to some extent solve the technical problems of high cost and low safety factor in the lowering and pulling out of the steam injection pipe in the injection and production operation of the existing process pipe string. To this end, the present application provides a suspension anchor channel device and a highly efficient sealed suspension steam injection process pipe string.

[0005] A hanging anchor channel device provided in an embodiment of the present application includes a hanging anchor sealing body and an elastic sealing member, wherein the hanging anchor sealing body is fixed on the inner wall of the casing; one end of the elastic sealing member is fixed on the hanging anchor sealing body, and the elastic sealing member is sleeved on the steam injection pipe. The elastic sealing member is sealed and fitted with the steam injection pipe as the steam injection pipe is pressed downward.

[0006] In some embodiments, the suspension anchoring channel device also includes an isolation sealing seat, which is slidably disposed on the suspension anchoring isolation body, and the other end of the elastic isolation member is fixed to the isolation sealing seat, and the isolation sealing seat compresses the elastic isolation member under the action of the steam injection pipe.

[0007] In some embodiments, the suspension anchoring channel device further comprises a channel guide tube, the channel guide sleeve is arranged on the surface of the elastic sealing member and fixed on the suspension anchoring sealing body, and the side surface of the elastic sealing member is in contact with the inner wall of the channel guide tube.

[0008] In some embodiments, the suspension anchoring enclosure includes a suspension enclosure and a suspension anchor shoe, the suspension enclosure is fixed to the inner wall of the casing; the suspension anchor shoe is fixed to the suspension enclosure, and the lower end of the elastic enclosure is fixed to the suspension enclosure.

[0009] In some embodiments, the elastic sealing member is a metal bellows having a plurality of corrugations, and the metal bellows is made of a high nickel-based alloy material.

[0010] The embodiment of the present application has at least the following beneficial effects: the hanging anchor channel device is provided with a hanging anchor packer and an elastic packer, one end of the elastic packer is fixed on the hanging anchor packer, in the steam injection preparation stage, the hanging anchor packer of the hanging anchor channel device is installed and fixed at a predetermined position of the casing by a hand-dropping operation, and then the steam injection pipe is lowered into the casing and passes through the elastic packer, and after being lowered to a certain distance, it will abut against the end face of the elastic packer, and the elastic packer is pressed downward under the action of its own gravity, and the downward pressing elastic packer When the elastic sealing member is installed, the elastic sealing member expands radially outward, so that the inner diameter of the elastic sealing member is reduced, and when the elastic sealing member is pressed down a certain distance, the inner wall of the elastic sealing member will fit tightly with the side of the steam injection pipe, so as to seal the elastic sealing member and the steam injection pipe. Therefore, through the arrangement of the above structure, the hanging anchoring channel device only needs to be lowered into and fixed to the inner wall of the casing, and then the steam injection pipe is lowered into the casing, so that the steam injection pipe can be installed in the casing, thereby effectively improving the installation efficiency of the steam injection pipe.

[0011] At the same time, due to the elastic support of the suspension anchor channel device on the steam injection pipe, after the steam injection pipe is completely lowered into the casing, the telescopic tube of the steam injection pipe is not in a fully stretched state; when the steam injection pipe is pulled out, even when the temperature of the steam injection pipe is reduced, the part of the steam injection pipe located above the thermal insulator shrinks, because the telescopic tube still has some elongation margin, the shrinkage margin can be effectively compensated, thereby avoiding the thermal packer from pulling the piston upward along the casing. Therefore, after the temperature of the steam injection pipe is reduced to a certain level and the thermal packer completes the unsealing action, the steam injection pipe is passed through the steam injection pipe to inject hot water to pressurize the well, and then the steam injection pipe is lifted up, and the elastic packer restores its initial state under the action of its own elastic force, and the steam injection pipe can be pulled out without any obstacle without the packer unblocking action; thereby effectively reducing the cost of pulling out the steam injection pipe and ensuring the safety of the steam injection pipe when it is pulled out.

[0012] Therefore, through the above settings of the hanging anchor channel device, the difficulty of lowering and pulling out the steam injection pipe can be effectively reduced, and the lowering and pulling out operations of the steam injection pipe can be achieved with high safety, high convenience, low risk and low cost.

[0013] An embodiment of the present application provides a high-efficiency sealed suspended steam injection process column, comprising the suspended anchor channel device, and also comprising a casing and a steam injection pipe, wherein the steam injection pipe is provided with a first sealer, the elastic sealing member is sleeved on the steam injection pipe and abutted against the first sealer, and the elastic sealing member is sealed and fitted with the steam injection pipe under the compression of the first sealer.

[0014] In some embodiments, a sealing nipple is further provided on the surface of the steam injection pipe, and the sealing nipple is located inside the elastic sealing component. The surface of the sealing nipple is covered with 3-5 layers of Teflon silicone adhesive tape, and the inner wall of the elastic sealing component is sealed with the Teflon silicone adhesive tape.

[0015] In some embodiments, a second sealer is further provided on the steam injection pipe, and the number of the suspension anchoring channel device and the sealing short section are both two. The two suspension anchoring channel devices are fixed to the inner wall of the casing through the suspension anchoring sealing body, and the two sealing short sections are respectively located in the elastic sealing components of the two suspension anchoring channel devices. The first sealer and the second sealer respectively press down the elastic sealing components of the two suspension anchoring channel devices so that the inner wall of the elastic sealing component is sealed and fitted with the Teflon silicone adhesive tape.

[0016] In some embodiments, the steam injection pipe includes a first thermal insulation compensating tube, a thermosensitive seal, a centralizer short section and a layered sealer arranged in sequence from top to bottom, the first thermal insulation compensating tube includes a first telescopic tube and a first thermal insulation tube fixed at both ends of the first telescopic tube, wherein the first thermal insulation tube is fixed on the thermosensitive seal, and a first telescopic compensator is arranged in the first telescopic tube; the thermosensitive seal is used to expand when the temperature rises and to seal with the inner wall of the casing; the centralizer short section is used to balance the insertion of the steam injection pipe, and the first sealer is fixed to the end of the centralizer short section; the layered sealer is fixed to the end of the first sealer, and the sealing short section is located on the layered sealer.

[0017] In some embodiments, the layered sealer includes a second thermal insulation compensation tube, a third thermal insulation tube, and a guide cone head, which are arranged in sequence from top to bottom. The second thermal insulation compensation tube includes a second telescopic tube and a second thermal insulation tube fixed at both ends of the second telescopic tube, wherein one of the second thermal insulation tubes is fixed to the first sealer, and the second sealer is fixed to the end of another second thermal insulation tube. A first steam injection valve is arranged on the second thermal insulation tube close to the first sealer, wherein one of the sealing short sections is located on the second thermal insulation tube close to the first sealer, and the third thermal insulation tube is fixed to the end of the second sealer. A second steam injection valve is arranged on the third thermal insulation tube, and another sealing short section is located on the third thermal insulation tube; the guide cone head is fixed to the end of the third thermal insulation tube.

[0018] The embodiment of the present application has at least the following beneficial effects: the process pipe string includes a suspension anchoring channel device, a casing and a steam injection pipe, and a first sealer is arranged on the steam injection pipe; in the steam injection preparation stage, the suspension anchoring seal body of the suspension anchoring channel device is installed and fixed at a predetermined position of the casing by a hand-dropping operation, and then the steam injection pipe is lowered into the casing and passes through the elastic seal, and after being lowered for a certain distance, it will abut against the end surface of the elastic seal, and the steam injection pipe presses down the elastic seal under the action of its own gravity. When the elastic seal is pressed down, the elastic seal expands radially, so that the inner diameter of the elastic seal is reduced, and when the elastic seal is pressed down for a certain distance, the inner wall of the elastic seal will fit closely with the side of the steam injection pipe, so as to seal the elastic seal and the steam injection pipe; through the arrangement of the above structure, the steam injection pipe can be installed in the casing only by lowering the suspension anchoring channel device and fixing it to the inner wall of the casing, and then lowering the steam injection pipe into the casing, which can effectively improve the installation efficiency of the steam injection pipe.

[0019] At the same time, due to the elastic support of the suspension anchor channel device on the steam injection pipe, after the steam injection pipe is completely lowered into the casing, the telescopic tube of the steam injection pipe is not in a fully stretched state; when the steam injection pipe is pulled out, even when the temperature of the steam injection pipe is reduced, the part of the steam injection pipe located above the thermal insulator shrinks, because the telescopic tube still has some elongation margin, the shrinkage margin can be effectively compensated, thereby avoiding the thermal packer from pulling the piston upward along the casing. Therefore, after the temperature of the steam injection pipe is reduced to a certain level and the thermal packer completes the unsealing action, hot water is injected into the steam injection pipe to pressurize the well, and then the steam injection pipe is lifted up. The elastic packer restores its initial state under the action of its own elastic force, and the steam injection pipe can be pulled out without obstacle; thereby effectively reducing the cost of pulling out the steam injection pipe and ensuring the safety of the steam injection pipe when it is pulled out.

[0020] The steam injection pipe column of this process can effectively reduce the difficulty of lowering and pulling out the steam injection pipe by setting up a hanging anchor channel device, and realize the lowering and pulling out operations of the steam injection pipe with high safety, high convenience, low risk and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A schematic diagram of the three-dimensional structure of the casing and the suspension anchor channel device in the embodiment of the present application is shown;

[0023] Figure 2 The schematic diagram of the structure of the highly efficient sealed suspended steam injection process column in the embodiment of the present application is shown;

[0024] Figure 3 Shows Figure 2 A partial enlarged view of the middle A;

[0025] Figure 4 Shows Figure 2 A partial enlarged view of point B in the middle;

[0026] Figure 5 A schematic structural diagram of a steam injection pipe of a highly efficient sealed suspended steam injection process column in an embodiment of the present application is shown.

[0027] Reference numerals:

[0028] 10—Casing 20—Suspension anchoring channel device 21—Suspension anchoring packer

[0029] 22—elastic sealing member 23—sealing seal seat 24—channel conduit

[0030] 40—steam injection pipe 51—first thermal insulation compensation pipe 52—thermal sensitive packer

[0031] 53 - Centralizer short section 54 - First sealer 60 - Layered sealer

[0032] 61—sealing short section 62—second thermal insulation compensation tube 63—second sealer

[0033] 64—third insulation pipe 65—guide cone head 66—first steam injection valve

[0034] 67—Second steam injection valve 221—Insertion channel 231—Insertion port

[0035] 211—suspended packing body 212—suspended anchor tile 511—first telescopic tube

[0036] 512—first thermal insulation tube 621—second telescopic tube 622—second thermal insulation tube. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0038] In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides various specific examples of processes and materials, but those of ordinary skill in the art may recognize the application of other processes and / or the use of other materials.

[0039] The present application is described below with reference to the accompanying drawings and specific embodiments: In one embodiment of the present application, Figure 1-4 As shown, a hanging anchor channel device is provided, including a hanging anchor sealing body 21 and an elastic sealing member 22, wherein the hanging anchor sealing body 21 is fixed on the inner wall of the casing 10; one end of the elastic sealing member 22 is fixed on the hanging anchor sealing body 21, and the elastic sealing member 22 is sleeved on the steam injection pipe 40, and the elastic sealing member 22 is sealed and fitted with the steam injection pipe 40 as the steam injection pipe 40 is pressed downward.

[0040] Specifically, the hanging anchor channel device 20 is provided with a hanging anchor packer 21 and an elastic packer 22, one end of the elastic packer 22 is fixed on the hanging anchor packer 21. In the steam injection preparation stage, the hanging anchor packer 21 of the hanging anchor channel device 20 is installed and fixed at a predetermined position of the casing 10 by a hand-drop operation, and then the steam injection pipe 40 is lowered into the casing 10 and passes through the elastic packer 22. After being lowered to a certain distance, it will abut against the end surface of the elastic packer 22. The steam injection pipe 40 presses down the elastic packer 22 under the action of its own gravity. When it is lowered to a predetermined depth, the lowering speed is reduced, while slowly lowering While observing the hanging weight tension gauge on the operating machine, when the elastic sealing member 22 is pressed down, the elastic sealing member 22 radially expands, so that the inner diameter of the elastic sealing member 22 is reduced, and when the elastic sealing member 22 is pressed down a certain distance, the inner wall of the elastic sealing member 22 will fit tightly with the side of the steam injection pipe 40, so as to seal the elastic sealing member 22 and the steam injection pipe 40; through the arrangement of the above structure, it is only necessary to lower the hanging anchor channel device 20 into and fix it to the inner wall of the casing 10, and then lower the steam injection pipe 40 into the casing 10, so as to realize the installation of the steam injection pipe 40 in the casing 10, which can effectively improve the installation efficiency of the steam injection pipe 40.

[0041] At the same time, due to the elastic support of the suspension anchor channel device 20 on the steam injection pipe 40, after the steam injection pipe 40 is completely lowered into the casing 10, the telescopic tube of the steam injection pipe 40 is not in a fully stretched state; when the steam injection pipe 40 is pulled out, even if the temperature of the steam injection pipe 40 decreases and the portion of the steam injection pipe 40 located above the thermal insulator shrinks, the telescopic tube still has some extension margin, so the shrinkage of the steam injection pipe 40 can be effectively compensated. , thereby preventing the thermal packer from pulling the piston upward along the casing 10. Therefore, after the temperature of the steam injection pipe 40 drops to a certain level and the thermal packer completes the unsealing action, the steam injection pipe 40 is pressurized by injecting hot water into the steam injection pipe 40, and then the steam injection pipe 40 is lifted up. The elastic packer 22 restores its initial state under the action of its own elastic force, and the steam injection pipe 40 can be lifted out without any obstacles; thereby effectively reducing the lifting cost of the steam injection pipe 40 and ensuring the safety of the steam injection pipe 40 when it is lifted out.

[0042] Therefore, by setting up the hanging anchor channel device 20, the difficulty of lowering and removing the steam injection pipe 40 can be effectively reduced, and the lowering and removing operations of the steam injection pipe 40 can be achieved with high safety, high convenience, low risk and low cost.

[0043] In another embodiment of the suspension anchoring channel device of the present application, the suspension anchoring channel device 20 also includes a sealing seat 23, which is slidably arranged on the suspension anchoring sealing body 21, and the other end of the elastic sealing member 22 is fixed to the sealing seat 23. The sealing seat 23 compresses the elastic sealing member 22 under the action of the steam injection pipe 40.

[0044] Specifically, when the steam injection pipe 40 contacts the isolation sealing seat, the weight of the steam injection pipe 40 acts on the isolation sealing seat 23 to form a conical seal, which together with the sealing structure between the side of the steam injection pipe 40 and the elastic isolation member 22, forms a multi-channel metal elastic sealing structure, which further improves the sealing performance of the process pipe column and reduces the steam cost of the process pipe column.

[0045] In this embodiment, further, Figure 1 As shown, the elastic sealing member 22 is provided with an insertion channel 221 inside, and the sealing seat 23 is provided with an insertion port 231 communicating with the insertion channel 221. The elastic sealing member 22 compresses the first sealer 54 so that the inner diameter of the insertion channel 221 is smaller than the inner diameter of the insertion port 231. With this structure, the elastic sealing member 22 can be fitted with the surface of the steam injection pipe 40 while the steam injection pipe 40 is inserted from the insertion port 231.

[0046] In another embodiment of the present application, Figure 1-4 As shown, the hanging anchor packer 21 includes a hanging packer 211 and a hanging anchor shoe 212. The hanging packer 211 is fixed to the inner wall of the casing 10, the hanging anchor shoe 212 is fixed to the hanging packer 211, and the lower end of the elastic packer 22 is fixed to the hanging packer 211. Specifically, the hanging packer 211 can seal the process string, further improve the steam injection efficiency of the steam injection process string, and reduce the use cost of the steam injection process string.

[0047] In another embodiment of the present application, Figure 1-4 As shown, the suspension anchor channel device 20 further includes a channel conduit 24, the channel conduit 24 sleeve is arranged on the surface of the elastic sealing member 22 and fixed on the suspension anchor shoe 212, and the side surface of the elastic sealing member 22 is in contact with the inner wall of the channel conduit 24. Specifically, the channel conduit 24 can limit the elastic sealing member 22, so that the elastic sealing member 22 is compressed inwardly when compressed, and the gap between the elastic sealing member 22 and the steam injection pipe 40 can be well sealed.

[0048] In this example, further, the elastic sealing member 22 is a corrugated metal bellows, which is made of high-nickel-based alloy material. The high-nickel-based alloy material has excellent compression resistance, chemical resistance, tensile resistance and aging resistance. In addition, the metal bellows has a good effect on reducing pipe column creep and vibration. The peak of the metal bellows is 8-15. The metal bellows within this peak range can provide better sealing performance while being easy to compress.

[0049] In one embodiment of the present application, Figure 2-3 As shown in Figure 5, a high-efficiency sealed suspended steam injection process column is provided, including the suspended anchor channel device 20, and also including a casing 10 and a steam injection pipe 40, wherein a first sealer 54 is provided on the steam injection pipe 40, and the elastic sealing member 22 is sleeved on the steam injection pipe 40 and abutted against the first sealer 54, and the elastic sealing member 22 is sealed and fitted with the steam injection pipe 40 under the compression of the first sealer 54.

[0050] Specifically, the process string includes a suspension anchor channel device 20, a casing 10 and a steam injection pipe 40, and a first sealer 54 is provided on the steam injection pipe 40; in the steam injection preparation stage, the suspension anchor packer 21 of the suspension anchor channel device 20 is installed and fixed at a predetermined position of the casing 10 by a hand-drop operation, and then the steam injection pipe 40 is lowered into the casing 10 and passes through the elastic packing 22. After being lowered to a certain distance, it will abut against the end surface of the elastic packing 22. The steam injection pipe 40 presses down the elastic packing 22 under its own gravity. When it is lowered to a predetermined depth, the lowering speed is reduced, and the operation is observed while it is lowered slowly. When the suspended weight tension gauge on the machine presses down the elastic sealing member 22, the elastic sealing member 22 expands radially, so that the inner diameter of the elastic sealing member 22 is reduced, and when the elastic sealing member 22 is pressed down a certain distance, the inner wall of the elastic sealing member 22 will fit tightly with the side of the steam injection pipe 40, thereby sealing the elastic sealing member 22 and the steam injection pipe 40. Therefore, through the arrangement of the above structure, it is only necessary to lower the hanging anchor channel device 20 into and fix it to the inner wall of the casing 10, and then lower the steam injection pipe 40 into the casing 10, so as to realize the installation of the steam injection pipe 40 in the casing 10, which can effectively improve the installation efficiency of the steam injection pipe 40.

[0051] At the same time, due to the elastic support of the suspension anchor channel device 20 on the steam injection pipe 40, after the steam injection pipe 40 is completely lowered into the casing 10, the telescopic tube of the steam injection pipe 40 is not in a fully stretched state; when the steam injection pipe 40 is pulled out, even if the temperature of the steam injection pipe 40 decreases and the portion of the steam injection pipe 40 located above the thermal insulator shrinks, the telescopic tube still has a partial extension margin, so the shrinkage margin of the steam injection pipe 40 can be effectively compensated, thereby In order to prevent the thermal seal from pulling the piston upward along the casing 10, after the temperature of the steam injection pipe 40 drops to a certain level and the thermal seal completes the unsealing action, the steam injection pipe 40 is pressurized by injecting hot water into the steam injection pipe 40, and then the steam injection pipe 40 is lifted up. The elastic seal 22 returns to its initial state under the action of its own elastic force, and the steam injection pipe 40 can be lifted out smoothly without the need for unsealing action, which effectively reduces the lifting cost of the steam injection pipe 40 and ensures the safety of the steam injection pipe 40 when it is lifted out.

[0052] The steam injection pipe column of this process can effectively reduce the difficulty of lowering and pulling out the steam injection pipe 40 by setting up the suspension anchor channel device 20, and realize the lowering and pulling out operation of the steam injection pipe 40 with high safety, high convenience, low risk and low cost.

[0053] In another embodiment of the present application, Figure 2-5 As shown, the surface of the steam injection pipe 40 is also provided with a sealing nipple 61, and the sealing nipple 61 is located in the elastic sealing member 22. The surface of the sealing nipple 61 is covered with 3-5 layers of Teflon silicone adhesive tape, and the inner wall of the elastic sealing member 22 is sealed and fitted with the Teflon silicone adhesive tape.

[0054] Specifically, the sealing nipple 61 and the multi-layer high temperature resistant Teflon silicone adhesive tape wrapped thereon cooperate to form multiple continuous elastic compression seals, which have very good pressure resistance and sealing performance. At the same time, before the next construction, only the high temperature resistant Teflon silicone adhesive tape needs to be replaced, which effectively reduces the use cost of the process pipe column.

[0055] In another embodiment of the present application, Figure 2 and 4 -5, a second sealer 63 is also provided on the steam injection pipe 40, the number of the hanging anchor channel device 20 and the sealing short section 61 are both two, the two hanging anchor channel devices 20 are fixed to the inner wall of the casing 10 through the hanging anchor sealing body 21, the two sealing short sections 61 are respectively located in the elastic sealing members 22 of the two hanging anchor channel devices 20, the first sealer 54 and the second sealer 63 respectively press down the elastic sealing members 22 of the two hanging anchor channel devices 20, so that the inner wall of the elastic sealing member 22 is sealed and fitted with the Teflon silicone adhesive tape.

[0056] Specifically, the two hanging anchor channel devices 20 are installed and fixed at the predetermined positions of the casing 10 by successively dropping the hands, and then the steam injection pipe 40 is lowered through the elastic sealing members 22 of the two hanging anchor channel devices 20 in sequence. When it reaches the predetermined depth, the lowering speed is reduced, and the hanging weight tension gauge on the operating machine is observed while slowly lowering. When the two hanging anchor channel devices 20 are both provided with sealing seats 23, the second sealer 63 contacts the sealing seats 23 of the hanging anchor channel device 20 located below to form a conical seal, and compresses the elastic sealing member 22 of the hanging anchor channel device 20 located below downward, so that the elastic sealing member 22 is sealed and fitted with the sealing short section 61, and the elastic sealing member 22 forms another seal with the sealing seat 23, thereby completing the seal between the hanging anchor channel device 20 located below and the casing 10.

[0057] Continue to release the steam injection pipe 40 downward, the first sealer 54 begins to contact the isolation sealing seat 23 of the suspended anchor channel device 20 located above, forming a conical seal, and the weight of the steam injection pipe 40 acts on the isolation sealing seat 23 of the suspended anchor channel device 20 located above to compress the elastic sealing member 22, so that the elastic sealing member 22 is sealed and fitted with the sealing short section 61, forming a multi-channel metal elastic sealing structure with the isolation sealing seat 23 of the suspended anchor channel device 20 located above.

[0058] The process pipe string finally forms a layered structure of the pipe string under the sealing of the two suspension anchor channel devices 20, realizes layered steam injection of the pipe string, and improves the steam injection efficiency of layered steam injection of the pipe string. When only one suspension anchor channel device 20 is installed in the casing 10 during the steam injection preparation stage, general steam injection of the pipe string can be realized.

[0059] In another embodiment of the present application, Figure 2 and 5 As shown, the steam injection pipe 40 includes a first thermal insulation compensating tube 51, a thermosensitive seal 52, a straightener short section 53 and a layered sealer 60 which are arranged in sequence from top to bottom, the first thermal insulation compensating tube 51 includes a first telescopic tube 511 and a first thermal insulation tube 512 fixed at both ends of the first telescopic tube 511, wherein the first thermal insulation tube 512 is fixed on the thermosensitive seal 52, and a first telescopic compensator is arranged in the first telescopic tube 511; the thermosensitive seal 52 is used to expand when the temperature rises and to seal with the inner wall of the casing 10; the straightener short section 53 is used to balance the insertion of the steam injection pipe 40, and the first sealer 54 is fixed to the end of the straightener short section 53; the layered sealer 60 is fixed to the end of the first sealer 54, and the sealing short section 61 is located on the layered sealer 60.

[0060] Specifically, after steam injection begins in the tubing string, the temperature inside the tubing string gradually increases from top to bottom, and after reaching a certain temperature (generally around 200°C), the thermal seal 52 begins to seal; the straightener pup joint 53 can provide balance for the steam injection pipe 40 to be inserted into the casing 10. Combined with the weight design and calculation of the tubing string below the first thermal insulation compensation pipe 51, if the pressure applied by the pipe weight is sufficient to achieve complete compression sealing of the elastic seal 22, a sleeve-type telescopic compensator can be used. If the pressure is insufficient, a multi-layer metal corrugated telescopic compensator can be used.

[0061] In another embodiment of the present application, Figure 2 and 5 As shown, the layered sealer 60 includes a second thermal insulation compensation tube 62, a third thermal insulation tube 64, and a guide cone head 65 which are arranged in sequence from top to bottom. The second thermal insulation compensation tube 62 includes a second telescopic tube 621 and a second thermal insulation tube 622 fixed at both ends of the second telescopic tube 621, wherein one of the second thermal insulation tubes 622 is fixed on the first sealer 54, and the second sealer 63 is fixed to the end of the other second thermal insulation tube 622. A first steam injection valve 66 is arranged on the second thermal insulation tube 622 near the first sealer 54, wherein one of the sealing short sections 61 is located on the second thermal insulation tube 622 near the first sealer 54, and the third thermal insulation tube 64 is fixed to the end of the second sealer 63. A second steam injection valve 67 is arranged on the third thermal insulation tube 64, and another of the sealing short sections 61 is located on the third thermal insulation tube 64. The guide cone head 65 is fixed to the end of the third thermal insulation tube 64.

[0062] Specifically, in this example, the casing 10 has a layered structure. In the steam injection preparation stage, after the steam injection pipe 40 is fully installed, the sealing pipe will realize effective layered isolation in the casing 10. The first steam injection valve 66 and the second steam injection valve 67 can be used to inject steam into the two steam injection layers respectively. If the oil well that needs to perform steam injection operation needs to perform casing 10 protection operation, nitrogen is injected into the oil casing annulus, and the pressure inside the oil casing annulus is increased to 10Mpa and the pressure drop rate is observed to test whether the suspension anchor channel device 20 located above is effectively isolated. If it is stable, it proves that the seal is good. At the same time, the high-pressure nitrogen injected into the annulus can, on the one hand, insulate and protect the casing 10, and can apply an inward compression force on the outer layer of the elastic isolation member 22 of the suspension anchor channel device 20 located above.

[0063] Generally speaking, if the steam injection pressure is not high (≤7MPa), the thermal-sensitive packer 52 can be omitted from the process pipe column structure of the present application. If the steam throughput well is shallow or if the injection pressure is designed to be high (≥13MPa), the layered steam injection pipe 40 column of the present application can also add another suspension anchoring channel device near the thermal-sensitive packer 52 to improve the safety of the steam injection operation.

[0064] In this example, further, the guide cone head 65 is made of carbon fiber material; the guide cone head 65 is high in strength and resistant to high temperatures, and the conical dome design can assist in inserting the casing 10 while avoiding damage to the two suspension anchoring channel devices 20 during the insertion of the steam injection pipe 40.

[0065] In another embodiment of the present application, the isolation seal seat 23, the first sealer 54 and the second sealer 63 are all made of high-hardness corrosion-resistant alloy. The isolation seal seat 23 and the sealing ball head are made of high-hardness corrosion-resistant alloy (such as TiC), which can achieve sealing effectiveness and durability during intubation.

[0066] In some embodiments, the end faces of the first sealer 54 and the second sealer 63 are conical or arcuate. Specifically, the end faces of the first sealer 54 and the second sealer 63 are adapted to the surface of the isolation seal seat 23 to form a conical seal or a curved seal, thereby improving the sealing effect between the first sealer 54 and the second sealer 63 and the isolation seal seat 23.

[0067] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0068] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0069] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0070] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0071] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0072] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0073] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0074] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A highly efficient sealed suspended steam injection process column, characterized in that: include: A suspension anchoring channel device, the suspension anchoring channel device comprising: A hanging anchor packer is fixed on the inner wall of the casing. An elastic packing, one end of which is fixed to the suspension anchor packing body, the elastic packing is sleeved on the steam injection pipe, and the elastic packing is sealed and fitted with the steam injection pipe as the steam injection pipe is pressed downward; casing; A steam injection pipe, wherein a first sealer is arranged on the steam injection pipe, the elastic sealing member is sleeved on the steam injection pipe and abuts against the first sealer, and the elastic sealing member is sealed and fitted with the steam injection pipe under the compression of the first sealer; The surface of the steam injection pipe is also provided with a sealing nipple, the sealing nipple is located in the elastic sealing member, the surface of the sealing nipple is covered with 3-5 layers of Teflon silicone adhesive tape, and the inner wall of the elastic sealing member is sealed and fitted with the Teflon silicone adhesive tape; The steam injection pipe includes the following components arranged in sequence from top to bottom: A first thermal insulation compensating tube; the first thermal insulation compensating tube comprises a first telescopic tube and first thermal insulation tubes fixed at both ends of the first telescopic tube, wherein the first thermal insulation tube is fixed on the thermal packer, and a first telescopic compensator is arranged in the first telescopic tube; A thermal packer, which is used to expand when the temperature rises and to seal against the inner wall of the casing; a centralizer nipple, the centralizer nipple being used to balance the insertion of the steam injection pipe, the first sealer being fixed to an end of the centralizer nipple; A delamination sealer is fixed to the end of the first sealer, and the sealing nipple is located on the delamination sealer.

2. The high-efficiency sealed suspended steam injection process column according to claim 1, characterized in that: The suspension anchor channel device also includes an isolation sealing seat, which is slidably arranged on the suspension anchor packer. The other end of the elastic packing is fixed to the isolation sealing seat, and the isolation sealing seat compresses the elastic packing under the action of the steam injection pipe.

3. The high-efficiency sealed suspended steam injection process column according to claim 1, characterized in that: The suspension anchoring channel device also includes a channel conduit, which is sleeved on the surface of the elastic sealing member and fixed on the suspension anchoring sealing body, and the side surface of the elastic sealing member is in contact with the inner wall of the channel conduit.

4. The high-efficiency sealed suspended steam injection process column according to claim 1, characterized in that: The hanging anchor packer comprises: A hanging packer, wherein the hanging packer is fixed on the inner wall of the casing; A hanging anchor shoe is fixed on the hanging packer, and the lower end of the elastic packer is fixed on the hanging packer.

5. The high-efficiency sealed suspended steam injection process column according to any one of claims 1 to 4, characterized in that: The elastic sealing member is a metal bellows with a plurality of corrugations, and the metal bellows is made of a high nickel-based alloy material.

6. The high-efficiency sealed suspended steam injection process column according to claim 1, characterized in that: A second sealer is also provided on the steam injection pipe. The number of the suspension anchoring channel devices and the sealing short sections are both two. The two suspension anchoring channel devices are fixed to the inner wall of the casing through the suspension anchoring sealing body. The two sealing short sections are respectively located in the elastic sealing parts of the two suspension anchoring channel devices. The first sealer and the second sealer respectively press down the elastic sealing parts of the two suspension anchoring channel devices so that the elastic sealing parts are sealed and fitted with the Teflon silicone adhesive tape.

7. The high-efficiency sealed suspended steam injection process column according to claim 6, characterized in that: The layered sealer includes: A second thermal insulation compensating tube, the second thermal insulation compensating tube comprising a second telescopic tube and second thermal insulation tubes fixed at both ends of the second telescopic tube, wherein one of the second thermal insulation tubes is fixed to the first sealer, the second sealer is fixed to the end of the other second thermal insulation tube, a first steam injection valve is arranged on the second thermal insulation tube near the first sealer, wherein one of the sealing nipples is located on the second thermal insulation tube near the first sealer; A third thermal insulation tube, the third thermal insulation tube is fixed to the end of the second sealer, the third thermal insulation tube is provided with a second steam injection valve, and the other sealing nipple is located on the third thermal insulation tube; A guide cone head is fixed to the end of the third thermal insulation tube.

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