Constant-setting-force thermosensitive long-rubber-cylinder steam injection tubular column

Abstract

The invention discloses a constant-setting-force thermosensitive long-rubber-barrel steam injection tubular column, and belongs to the technical field of oil extraction technologies, the constant-setting-force thermosensitive long-rubber-barrel steam injection tubular column comprises a sleeve, and a hydraulic release telescopic pipe assembly, a thermosensitive packer assembly, an anchoring packer assembly and a ball seat assembly which are arranged in the sleeve and are sequentially communicated through an oil pipe, a ball body is put into an oil pipe, the ball body is suitable for being matched with a ball seat assembly and sealing the oil pipe at the position of the ball seat assembly, high-pressure fluid is injected into the oil pipe, an anchoring packer assembly extends in the direction of a casing pipe and is anchored to the inner wall of the casing pipe, and a hydraulic release telescopic pipe assembly extends in the axial direction; therefore, the upper connector assembly and the lower connector assembly in the thermosensitive packer assembly can move relative to each other. Steam is injected into the oil pipe, and the thermosensitive packer assembly expands towards the inner wall of the casing pipe after being heated and seals and plugs the casing pipe. The steam injection tubular column has the advantage that the setting pressure of the thermosensitive packer assembly on the casing pipe is effectively reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of oil production technology, and in particular relates to a constant-sealing-force thermal-sensitive long rubber tube steam injection pipe column. Background Art

[0002] The sealing force of the packer in the existing steam injection string is uncontrollable. In order to ensure the steam injection sealing performance under the high temperature environment underground, the sealing force is often very large. Under the long-term high temperature environment underground, the casing at the sealing position of the packer is easily deformed due to the long-term influence of the radial pressure of the packer. The long-term force is easy to cause casing damage and failure of the steam injection string seal, causing irreversible damage to the casing. At the same time, it will greatly reduce the service life of the steam injection string. Summary of the invention

[0003] The present application aims to at least to some extent solve the technical problem that the casing at the sealing position of the packer is easily deformed or damaged due to the long-term influence of the radial pressure of the packer, thereby affecting the sealing of the steam injection pipe column. Therefore, the present application provides a constant sealing force thermistor long rubber tube steam injection pipe column.

[0004] In the first aspect, an embodiment of the present application provides a constant-sealing-force thermal-sensitive long rubber-tube steam-injection pipe string, comprising: a casing; and a hydraulic-release telescopic tube assembly, a thermal-sensitive packer assembly, an anchoring packer assembly, and a ball seat assembly, which are arranged in the casing and connected in sequence through an oil pipe, wherein a ball is dropped into the oil pipe, the ball is suitable for matching with the ball seat assembly and sealing the oil pipe at the ball seat assembly, and high-pressure fluid is injected into the oil pipe, so that the anchoring packer assembly extends toward the casing and is anchored on the inner wall of the casing, and the hydraulic-release telescopic tube assembly extends axially so that the upper joint assembly and the lower joint assembly in the thermal-sensitive packer assembly can achieve relative movement; steam is injected into the oil pipe, and the thermal-sensitive packer assembly will expand toward the inner wall of the casing after being heated and seal the casing.

[0005] Wherein, the thermal-sensitive packer assembly comprises the upper joint assembly and the lower joint assembly, wherein the upper joint assembly is detachably connected to the lower joint assembly.

[0006] The upper joint assembly comprises an outer central tube and a thermosensitive adhesive tube sleeved on the outer central tube, wherein a thermosensitive cavity is constructed on the thermosensitive adhesive tube, and a thermosensitive substance is contained in the thermosensitive cavity.

[0007] Wherein, the upper joint assembly also includes an upper connector and an upper joint, wherein one end of the upper joint is connected to the oil pipe, and the other end is connected to the first end of the upper connector, and the second end of the upper connector is detachably connected to the outer center pipe.

[0008] Wherein, the lower joint assembly comprises an inner central tube, and the outer central tube is sleeved on the inner central tube and connected as a whole through pins.

[0009] An annular cavity opening toward the inner central tube is formed on the outer central tube, wherein the annular cavity and the outer wall of the inner central tube together form a buffer chamber.

[0010] Wherein, a through hole is constructed on the outer wall of the inner central tube, and the through hole is communicated with the buffer chamber.

[0011] Wherein, the lower joint assembly also includes a lower connecting head, and the lower connecting head is detachably connected to the inner center tube.

[0012] Wherein, the lower joint assembly also includes a lower joint that is partially sleeved on the lower connecting head and detachably connected to the lower connecting head.

[0013] Among them, the lower joint assembly also includes an outer ring and an unsealing needle seat mounted on the lower connector, wherein one end of the outer ring is sealingly connected to the thermal adhesive tube, and the other end of the outer ring is connected to the unsealing needle seat as a whole through an unsealing pin.

[0014] Wherein, the lower joint assembly further comprises a desealing needle which is arranged on the desealing needle seat and extends toward the side end surface of one end of the thermal glue cylinder.

[0015] The anchor packer assembly includes an anchor packer body connected to the oil pipe and an anchor claw arranged on the anchor packer body and extending toward the inner wall of the casing.

[0016] Among them, the constant-sealing-force thermal-sensitive long rubber tube steam injection pipe column also includes a ball basket and a steam injection valve, wherein the ball basket is arranged below the ball seat assembly and is suitable for catching the ball dropped into the oil pipe, and the steam injection valve is arranged on the oil pipe connecting the ball basket and the ball seat assembly.

[0017] Compared with the prior art, the constant sealing force thermal sensitive long rubber tube steam injection pipe string of the present application has the following advantages:

[0018] After the constant sealing force thermal-sensitive long rubber tube steam injection pipe column of the present application is lowered, a ball is dropped into the oil pipe, and the ball is stuck in the opening of the ball seat assembly. At this time, the ball seat assembly is in a sealed state. By injecting high-pressure fluid into the oil pipe, the pressure in the constant sealing force thermal-sensitive long rubber tube steam injection pipe column begins to build up. When the pressure in the constant sealing force thermal-sensitive long rubber tube steam injection pipe column reaches a certain level, the anchoring packer assembly extends toward the direction of the casing and anchors to the inner wall of the casing. The hydraulic release telescopic tube assembly extends axially to enable the upper joint assembly and the lower joint assembly in the thermal packer assembly to achieve relative movement. Steam is injected into the oil pipe. After being heated, the thermal packer assembly will expand toward the inner wall of the casing and seal the casing. It can be seen that the present application The sealing force of the thermal packer assembly is balanced by the deadweight of the tubing between the thermal packer assembly and the hydraulic release telescopic tube assembly, so that the thermal packer assembly will not be affected by the steam injection temperature and can always maintain a constant sealing force during operation. At the same time, the thermal rubber tube in the thermal packer assembly of the present application adopts a long rubber tube design, which greatly increases the contact area between the thermal rubber tube and the casing in the thermal packer assembly, effectively reduces the sealing pressure of the thermal packer assembly on the casing, and further reduces the damage of the thermal packer assembly to the casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] Figure 1 The overall structural schematic diagram of the constant sealing force thermal sensitive long rubber tube steam injection pipe string of the embodiment of the present application is shown;

[0021] Figure 2 for Figure 1 Schematic diagram of the overall structure of the thermal packer assembly.

[0022] Figure markings: 1: casing; 2: oil pipe; 3: hydraulic release telescopic tube assembly; 4: thermal packer assembly; 41: upper joint assembly; 411: outer center tube; 412: thermal rubber tube; 413: upper connector; 414: upper joint; 421a: thermal chamber; 42: lower joint assembly; 421: inner center tube; 421a: through hole; 422: pin; 423: lower connector; 424: lower joint; 425: outer ring; 426: unsealing needle seat; 427: unsealing needle; 428: buffer chamber; 429: unsealing needle; 5: anchoring packer assembly; 51: anchoring packer body; 52: anchoring claw; 6: ball seat assembly; 7: ball. DETAILED DESCRIPTION

[0023] 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 creative work are within the scope of protection of this application.

[0024] 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.

[0025] 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.

[0026] In addition, in this application, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. 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.

[0027] In the related art, there is a technical problem that the sealing force of the packer in the existing steam injection string is uncontrollable. In order to ensure the sealing of the steam injection in the high-temperature environment underground, the sealing force is often very large. In the long-term high-temperature environment underground, the casing at the sealing position of the packer is easily deformed due to the long-term influence of the radial pressure of the packer, and the long-term force is easy to cause the casing damage and the failure of the steam injection string seal, causing irreversible damage to the casing. At the same time, it will greatly reduce the service life of the steam injection string. The embodiment of the present application provides a constant sealing force thermistor long rubber tube steam injection string, which can at least solve the technical problem that the casing at the sealing position of the packer is easily deformed due to the long-term influence of the radial pressure of the packer, and the long-term force is easy to cause the casing damage and the failure of the steam injection string seal, causing irreversible damage to the casing. At the same time, it will greatly reduce the service life of the steam injection string.

[0028] The following is combined with Figure 1 to Figure 2 The present application is shown and described with reference to specific embodiments:

[0029] An embodiment of the present application provides a constant-sealing-force thermal-sensitive long rubber tube steam injection string, which includes a casing 1, an oil pipe 2, a hydraulic release telescopic tube assembly 3, a thermal-sensitive packer assembly 4, an anchor packer assembly 5, a ball seat assembly 6, a ball 7, a ball basket 8 and a steam injection valve 9.

[0030] In an embodiment of the present application, the hydraulic release telescopic tube assembly 3, the thermal seal assembly 4, the anchoring seal assembly 5 and the ball seat assembly 6 are all arranged in the casing 1 and are connected in sequence through the oil pipe 2, wherein a ball 7 is dropped into the oil pipe 2, the ball 7 is suitable for matching with the ball seat assembly 6 and sealing the oil pipe 2 at the ball seat assembly 6, and by injecting high-pressure fluid into the oil pipe 2, the anchoring seal assembly 5 is extended toward the direction of the casing 1 and anchored on the inner wall of the casing 1, and the hydraulic release telescopic tube assembly 3 is extended axially so that the upper joint assembly 41 and the lower joint assembly 42 in the thermal seal assembly 4 can achieve relative movement; steam is injected into the oil pipe 2, and the thermal seal assembly 4 will expand toward the inner wall of the casing 1 after being heated and seal the casing 1. Specifically, after the sealing is performed, the constant sealing force thermal sensitive long rubber cylinder steam injection pipe column of the present application is lowered (at this time, the ball seat assembly 6 is in an open state, and there is no ball at the ball seat assembly 6), the ball 7 is dropped into the oil pipe 2, and the ball 7 will be stuck at the opening of the ball seat assembly 6. At this time, the ball seat assembly 6 is in a sealed state. By injecting high-pressure fluid into the oil pipe 2 (for example, injecting clean water into the oil pipe 2 of the constant-sealing-force thermal-sensitive long rubber tube steam injection string), the constant-sealing-force thermal-sensitive long rubber tube steam injection string begins to be pressurized. When the pressure in the constant-sealing-force thermal-sensitive long rubber tube steam injection string reaches a certain level, the anchoring packer assembly 5 extends toward the direction of the casing 1 and anchors on the inner wall of the casing 1. The hydraulic release telescopic tube assembly 3 extends axially to enable the upper joint assembly 41 and the lower joint assembly 42 in the thermal-sensitive packer assembly 4 to achieve relative movement, and steam is injected into the oil pipe 2. After being heated, the thermal-sensitive packer assembly 4 will expand toward the inner wall of the casing 1 and press the casing 1. It can be seen that the present application balances the sealing force of the thermal packer assembly 4 through the deadweight of the tubing between the thermal packer assembly 4 and the hydraulic release telescopic tube assembly 3, so that the thermal packer assembly 4 is not affected by the steam injection temperature and can always maintain a constant sealing force during the operation. At the same time, the thermal rubber tube 42 in the thermal packer assembly 4 of the present application adopts a long rubber tube design, thereby greatly increasing the contact area between the thermal rubber tube 412 in the thermal packer assembly 4 and the casing 1, effectively reducing the sealing pressure of the thermal packer assembly 4 on the casing 1, and further reducing the damage of the thermal packer assembly 4 to the casing 1.

[0031] like Figure 2 As shown, in some embodiments, the thermal packer assembly 4 includes the upper joint assembly 41 and the lower joint assembly 42, wherein the upper joint assembly 41 is detachably connected to the lower joint assembly 42. Specifically, in the working state, the thermal packer assembly 4 is located underground, the upper joint assembly 41 is arranged above the lower joint assembly 42, and the upper joint assembly 41 and the lower joint assembly 42 can be connected as a whole by means of snaps, bolts or threaded connections.

[0032] like Figure 2 As shown, in some embodiments of the present application, the upper joint assembly 41 includes an outer central tube 411 and a thermally sensitive rubber tube 412 sleeved on the outer central tube 411, wherein a thermally sensitive cavity 412a is constructed on the thermally sensitive rubber tube 412, and a thermally sensitive substance is contained in the thermally sensitive rubber tube 412a. Specifically, by sleeved on the outer central tube 411 with the thermally sensitive rubber tube 412, and containing a thermally sensitive substance in the thermally sensitive rubber tube 412, when steam is injected into the oil pipe 1, the thermally sensitive substance in the thermally sensitive rubber tube 412 will expand due to the heat, causing the thermally sensitive rubber tube 412 to move toward the inner wall of the casing 1, thereby sealing the upper and lower spaces in the casing 1 and achieving the setting of the casing 1. At this time, the thermal glue cylinder 412 is subjected to the pressure of the lower end pipe column of the upper joint assembly 41 and the hydraulic release telescopic tube assembly 3. When the pressure of the thermal glue cylinder 412 is too large, the thermal glue cylinder 412 can push up the upper joint assembly 41 and the hydraulic release telescopic tube assembly 3 to ensure that the pressure of the thermal glue cylinder 412 is balanced with the self-weight of the upper joint assembly 41 and the hydraulic release telescopic tube assembly 3. At this time, the axial direction of the thermal glue cylinder 412 is extended, but the sealing force of the thermal glue cylinder 412 remains constant.

[0033] like Figure 2 As shown, in some embodiments of the present application, the upper joint assembly 41 further includes an upper connector 413 and an upper joint 414, wherein one end of the upper joint 414 is connected to the oil pipe 2, the other end is connected to the first end of the upper connector 413, and the second end of the upper connector 413 is detachably connected to the outer center pipe 411. Specifically, one end of the upper joint 414 is detachably connected to the oil pipe 2 (threaded connection, bolted connection or snap connection), the other end is detachably connected to the upper connector 413 (threaded connection, bolted connection or snap connection), and the second end of the upper connector 413 is detachably connected to the outer center pipe 411, thereby facilitating the rapid installation and removal of the upper joint 414, the upper connector 413 and the outer center pipe 411.

[0034] like Figure 2 As shown, in some embodiments of the present application, the lower joint assembly 42 includes an inner central tube 421, and the outer central tube 411 is sleeved on the inner central tube 421 and connected as a whole through a pin 422. Specifically, the outer central tube 411 is sleeved on the inner central tube 421 and connected as a whole through the pin 422, so that a firm connection between the outer central tube 411 and the inner central tube 421 can be achieved. Specifically, the pin 422 passes through the outer wall of the outer central tube 411 and the outer wall of the inner central tube 421 in sequence, and by tightening the pin 422, a fixed connection between the outer central tube 411 and the inner central tube 421 can be achieved.

[0035] like Figure 2 As shown, in some embodiments of the present application, an annular cavity opening toward the inner central tube 411 is configured on the outer central tube 411, wherein the annular cavity and the outer wall of the inner central tube 421 together form a buffer chamber 428. It should be noted that the buffer chamber 428 is suitable for a portion of the high-pressure fluid to flow into.

[0036] like Figure 2 As shown, in some embodiments of the present application, a through hole 421 a is constructed on the outer wall of the inner central tube 421 , and the through hole 421 a is connected to the buffer chamber 428 . Specifically, before sealing, high-pressure fluid is injected into the oil pipe 2, and the high-pressure fluid will flow through the oil pipe 2 through the inner center tube 421, and flow into the buffer chamber 428 through the through hole 421a on the inner center tube 421. As the amount of high-pressure fluid flowing into the buffer chamber 428 gradually increases, the pressure in the buffer chamber 428 will gradually increase, thereby promoting the inner center tube 421 and the outer center tube 411 to move relative to each other. That is, under normal circumstances, since the inner center tube 421 and the outer center tube 411 are fixedly connected as a whole by the pin 422, it is ensured that there is no relative movement between the inner center tube 421 and the outer center tube 411. However, when the shear force between the inner center tube 421 and the outer center tube 411 reaches a certain level, the pin 422 will be sheared off, thereby realizing the relative movement between the inner center tube 421 and the outer center tube 411.

[0037] like Figure 2 As shown, in some embodiments of the present application, the lower joint assembly 42 further includes a lower connector 423, and the lower connector 423 is detachably connected to the inner center tube 421. Specifically, the lower connector 423 and the inner center tube 421 can be connected as one by threaded connection or snap connection.

[0038] like Figure 2 As shown, in some embodiments of the present application, the lower joint assembly 42 further includes a lower joint 424 partially sleeved on the lower connecting head 423 and detachably connected to the lower connecting head 423. Specifically, the lower joint 424 can be connected to the lower connecting head 423 as a whole by a connection method such as a threaded connection, a bolt connection, or a snap connection.

[0039] like Figure 2As shown, in some embodiments of the present application, the lower joint assembly 42 further includes an outer sleeve 425 and an unsealing needle seat 426 sleeved on the lower connector 423, wherein one end of the outer sleeve 425 is sealed and connected to the thermal glue cylinder 412, and the other end of the outer sleeve 425 is connected to the unsealing needle seat 426 as a whole through an unsealing pin 427. Specifically, the unsealing needle seat 426 is sleeved on the lower connector 423, one end of the outer sleeve 425 is sealed and connected to the thermal glue cylinder 412, and the other end is connected to the unsealing needle seat 426 as a whole through an unsealing pin 427. Specifically, when unsealing, the oil pipe 2 is lowered. At this time, the lower joint assembly 42 in the thermal packer assembly 4 is fixed by the anchor packer assembly 5 at the lower end. When the steam injection string of the present application is lowered, the upper joint assembly 41 in the thermal packer assembly 4 pushes the thermal glue cylinder 412 downward. When the pressure reaches a certain level, the thermal glue cylinder 412 acts on the downward ( Figure 2 When the force (horizontally to the right in the direction shown) is greater than the shear force of the unsealing pin 427, the unsealing pin 427 is sheared off, and at the same time, the unsealing needle seat 426 is knocked off, and the unsealing needle 429 shown below contacts and punctures the thermosensitive glue tube 412, thereby achieving unsealing. After the thermosensitive packer assembly 4 is unsealed, the steam injection string of this application is lifted up. When the lifting force reaches a certain level, the unsealing pin (not shown in the figure) in the anchoring packer assembly 5 is sheared off, and the anchoring claw in the anchoring packer assembly 5 shrinks toward the center in the direction away from the inner wall of the casing 1. At this time, the steam injection string of this application is no longer anchored with the casing 1, and the steam injection string of this application can be lifted up from top to bottom to remove the tool.

[0040] like Figure 2 As shown, in some embodiments of the present application, the lower joint assembly 42 also includes an unsealing needle 429 disposed on the unsealing needle seat 426 and extending toward the side end surface of one end of the thermal glue cylinder 412. Specifically, the unsealing needle 429 is configured to puncture the thermal glue cylinder 412, thereby achieving unsealing.

[0041] It should be noted that the tip of the desealing needle 412 is always facing the side end surface of one end of the thermal adhesive tube 412, and the desealing needle 412 can be arranged horizontally or inclined relative to the horizontal.

[0042] like Figure 1As shown, in some embodiments of the present application, the anchor packer assembly 5 includes an anchor packer body 51 connected to the oil pipe 2 and an anchor claw 52 arranged on the anchor packer body 51 and extending toward the inner wall of the casing 1. Specifically, when high-pressure fluid is injected into the oil pipe 2, the anchor packer assembly 5, under the action of the high-pressure fluid, causes the anchor claw 52 to extend toward the inner wall of the casing 1, thereby causing the entirety of the anchor packer assembly 5 to be fixed in the casing 1, ensuring that the entirety of the steam injection string of the present application can be fixed in the casing 1 to avoid falling.

[0043] like Figure 1 As shown, in some embodiments of the present application, the constant-seating sealing force thermal-sensitive long rubber tube steam injection string further includes a ball basket 8 and a steam injection valve 9, wherein the ball basket 8 is arranged below the ball seat assembly 6 and is suitable for receiving the ball 7 dropped into the oil pipe 2, and the steam injection valve 9 is arranged on the oil pipe 2 connecting the ball basket 8 and the ball seat assembly 6. Specifically, during steam injection, steam is injected into the oil pipe 2, at which time, the thermal-sensitive rubber tube 412 expands due to heat, thereby sealing the upper and lower spaces in the casing 1 where the thermal-sensitive packer assembly 4 is located. At this time, the thermal glue cylinder 412 is subjected to the pressure of the pipe column at the lower end of the upper joint assembly 41 and the hydraulic release telescopic tube assembly 3. When the pressure of the thermal glue cylinder 412 is too large, the thermal glue cylinder 412 can push up the upper joint assembly 41 and the hydraulic release telescopic tube assembly 3 to ensure that the pressure of the thermal glue cylinder 412 is balanced with the self-weight of the upper joint assembly 41 and the hydraulic release telescopic tube assembly 3. At this time, the axial direction of the thermal glue cylinder 412 is extended, but the sealing force of the thermal glue cylinder 412 remains constant.

[0044] It should be noted that the ball seat assembly 6 is a conventional ball seat. Dropping a ball 7 into the steam injection pipe column of the present application can seal the space in the steam injection pipe column above the ball seat assembly 6. At this time, liquid is injected into the pipe column to hold the pressure and increase the liquid pressure in the steam injection pipe column. In conjunction with other hydraulic switches (such as the steam injection valve 9), when the pressure exceeds the set threshold, the shear pin (not shown in the figure) in the ball seat assembly 6 will be broken, and the ball seat assembly 6 will fall into the ball basket 8. At this time, the upper steam injection pipe column on the ball seat assembly 6 is connected to the lower steam injection pipe column.

[0045] To sum up, after the sealing is performed and the constant sealing force thermal sensitive long rubber tube steam injection pipe column of the present application is lowered (at this time, the ball seat assembly 6 is in an open state and there is no ball at the ball seat assembly 6), the ball 7 is dropped into the oil pipe 2, and the ball 7 will be stuck at the opening of the ball seat assembly 6. At this time, the ball seat assembly 6 is in a sealed state. By injecting high-pressure fluid into the oil pipe 2 (for example, injecting clean water into the oil pipe 2 of the constant-sealing-force thermal-sensitive long rubber tube steam injection string), the constant-sealing-force thermal-sensitive long rubber tube steam injection string begins to be pressurized. When the pressure in the constant-sealing-force thermal-sensitive long rubber tube steam injection string reaches a certain level, the anchoring packer assembly 5 extends toward the direction of the casing 1 and anchors on the inner wall of the casing 1. The hydraulic release telescopic tube assembly 3 extends axially to enable the upper joint assembly 41 and the lower joint assembly 42 in the thermal-sensitive packer assembly 4 to achieve relative movement, and steam is injected into the oil pipe 2. After being heated, the thermal-sensitive packer assembly 4 will expand toward the inner wall of the casing 1 and press the casing 1. It can be seen that the present application balances the sealing force of the thermal packer assembly 4 through the deadweight of the tubing between the thermal packer assembly 4 and the hydraulic release telescopic tube assembly 3, so that the thermal packer assembly 4 is not affected by the steam injection temperature and can always maintain a constant sealing force during the operation. At the same time, the thermal rubber tube 42 in the thermal packer assembly 4 of the present application adopts a long rubber tube design, thereby greatly increasing the contact area between the thermal rubber tube 412 in the thermal packer assembly 4 and the casing 1, effectively reducing the sealing pressure of the thermal packer assembly 4 on the casing 1, and further reducing the damage of the thermal packer assembly 4 to the casing 1.

[0046] 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.

[0047] 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.

[0048] 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 constant sealing force thermal sensitive long rubber tube steam injection string, characterized in that: include: Casing; and A hydraulic release telescopic tube assembly, a thermal seal assembly, an anchoring seal assembly and a ball seat assembly are arranged in the casing and connected in sequence through the oil pipe, wherein a ball is dropped into the oil pipe, the ball is suitable for matching with the ball seat assembly and sealing the oil pipe at the ball seat assembly, and by injecting high-pressure fluid into the oil pipe, the anchoring seal assembly extends toward the casing and anchors on the inner wall of the casing, and the hydraulic release telescopic tube assembly extends axially to enable the upper joint assembly and the lower joint assembly in the thermal seal assembly to achieve relative movement; steam is injected into the oil pipe, and the thermal seal assembly will expand toward the inner wall of the casing after being heated and seal the casing.

2. The constant sealing force thermal sensitive long rubber tube steam injection string according to claim 1 is characterized in that: The thermal packer assembly includes the upper joint assembly and the lower joint assembly, wherein the upper joint assembly is detachably connected to the lower joint assembly.

3. The constant sealing force thermal sensitive long rubber tube steam injection string according to claim 2 is characterized in that: The upper joint assembly comprises an outer central tube and a thermally sensitive adhesive tube sleeved on the outer central tube, wherein a thermally sensitive cavity is constructed on the thermally sensitive adhesive tube, and a thermally sensitive substance is contained in the thermally sensitive cavity.

4. The constant sealing force thermal sensitive long rubber tube steam injection string according to claim 3 is characterized in that: The upper joint assembly also includes an upper connector and an upper joint, wherein one end of the upper joint is connected to the oil pipe, the other end is connected to the first end of the upper connector, and the second end of the upper connector is detachably connected to the outer center pipe.

5. The constant sealing force thermal sensitive long rubber tube steam injection string according to claim 4 is characterized in that: The lower joint assembly comprises an inner center tube, and the outer center tube is sleeved on the inner center tube and connected as a whole through pins.

6. The constant sealing force thermal sensitive long rubber tube steam injection string according to claim 5 is characterized in that: An annular cavity opening toward the inner central tube is configured on the outer central tube, wherein the annular cavity and the outer wall of the inner central tube together form a buffer chamber.

7. The constant sealing force thermal sensitive long rubber tube steam injection string according to claim 6 is characterized in that: A through hole is configured on the outer wall of the inner central tube, and the through hole is communicated with the buffer chamber.

8. The constant sealing force thermal sensitive long rubber tube steam injection string according to claim 5 is characterized in that: The lower joint assembly also includes a lower connecting head, and the lower connecting head is detachably connected to the inner center pipe.

9. The constant sealing force thermal sensitive long rubber tube steam injection string according to claim 8, characterized in that: The lower joint assembly also includes a lower joint that is partially sleeved on the lower connecting head and detachably connected to the lower connecting head.

10. The constant sealing force thermal sensitive long rubber tube steam injection string according to claim 9, characterized in that: The lower joint assembly also includes an outer sleeve ring and an unsealing needle seat sleeved on the lower connector, wherein one end of the outer sleeve ring is sealingly connected to the thermal adhesive tube, and the other end of the outer sleeve ring is connected to the unsealing needle seat as a whole through an unsealing pin.

11. The constant sealing force thermal sensitive long rubber tube steam injection string according to claim 10, characterized in that: The lower joint assembly also includes a desealing needle which is arranged on the desealing needle seat and extends toward the side end surface of one end of the thermal glue cylinder.

12. The constant sealing force thermal sensitive long rubber tube steam injection string according to claim 1, characterized in that: The anchor packer assembly comprises an anchor packer body communicated with the oil pipe and an anchor claw arranged on the anchor packer body and extending toward the inner wall direction of the casing.

13. The constant sealing force thermal sensitive long rubber tube steam injection string according to claim 1, characterized in that: The constant-sealing-force thermistor-sensitive long rubber tube steam injection pipe column also includes a ball basket and a steam injection valve, wherein the ball basket is arranged below the ball seat assembly and is suitable for catching the ball dropped into the oil pipe, and the steam injection valve is arranged on the oil pipe connecting the ball basket and the ball seat assembly.

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