CN215860026U - Rotatable telescopic short section and acid fracturing well completion pipe string - Google Patents
Rotatable telescopic short section and acid fracturing well completion pipe string Download PDFInfo
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- CN215860026U CN215860026U CN202121550028.4U CN202121550028U CN215860026U CN 215860026 U CN215860026 U CN 215860026U CN 202121550028 U CN202121550028 U CN 202121550028U CN 215860026 U CN215860026 U CN 215860026U
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Abstract
The utility model discloses a rotatable telescopic short section which comprises a mandrel extending longitudinally, a body sleeved outside the mandrel in a sealing mode, and a connecting mechanism for connecting the mandrel and the body. The connecting mechanism comprises a connecting body fixedly connected with the body and a torque transmission piece fixedly connected with the connecting body. The torque transmitting member is configured to: in an initial state, the cutting pin is connected with the mandrel through a key groove assembly arranged along the longitudinal direction; the shear pin can move along the longitudinal direction in a first state after being sheared by the stress borne by the rotatable telescopic short section; and in a second state requiring rotation, rotational torque from the body can be transmitted to the spindle through the keyway assembly. The rotatable telescopic short section can be used for compensating the shrinkage of a well completion pipe column, can realize the function of rotating and transmitting torque, and meets the requirement of processing field abnormal conditions. The utility model also discloses an acid fracturing well completion pipe string.
Description
Technical Field
The utility model relates to the technical field of petroleum production, in particular to a rotatable telescopic short section and an acid fracturing well completion pipe string comprising the same.
Background
In the process of oil and gas exploitation, the acid fracturing operation is a very effective production increasing method, and the production increasing effect on carbonate reservoirs is more obvious. Typically, acid fracturing operations require setting a packer above the reservoir. In order to increase the production, a packer is usually used to allow acid to enter the producing zone smoothly before fracturing. However, when the acid solution at normal temperature is injected into the wellbore, the temperature difference between the well temperature and the acid solution temperature is formed, so that additional tension is generated on the packer. The tension can cause the shrinkage of the whole well completion string, so that the packer is disconnected or lost in advance, and the yield increasing effect under the acidizing pressure operation is influenced.
In the prior art, a common way is to install a telescopic short joint at the upper end of the packer. When additional tension is generated in the shaft due to temperature difference, the telescopic short joint compensates the shrinkage of the whole well completion pipe string in an automatic telescopic mode. In this case, the packer no longer bears additional tensile load, and the sealing performance of the packer is further ensured.
However, during the actual oil and gas production process, the telescopic short joint is not suitable for some packers needing to be rotationally disconnected and unsealed. Therefore, at present, the packer can be disconnected and unsealed in a telescopic mode, and the packer can be disconnected and unsealed in a rotary mode.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a rotatable telescopic short section which can be used for compensating the shrinkage of a well completion pipe string, can realize the function of rotating and transmitting torque and meet the requirement of processing field abnormal conditions. The utility model also aims to provide the acid fracturing well completion pipe string.
According to a first aspect of the present invention, there is provided a rotatable telescopic sub comprising: the connecting mechanism comprises a connecting body fixedly connected with the body and a torque transmission piece fixedly connected with the connecting body, wherein the torque transmission piece is configured to: in an initial state, the core shaft is connected with the core shaft through a shearing pin and a key groove assembly arranged along the longitudinal direction; the shear pin can move along the longitudinal direction in a first state after being sheared by the stress borne by the rotatable telescopic short section; and in a second state requiring rotation, rotational torque from the body can be transmitted to the spindle through the keyway assembly.
In one embodiment, the connecting body is configured as a hollow cylinder, a protruding portion is disposed on an outer surface of the hollow cylinder, a first connecting portion and a second connecting portion are disposed on two sides of the protruding portion, the first connecting portion is fixedly connected with the body, and the second connecting portion is fixedly connected with the torque transmission member.
In one embodiment, the mandrel is provided with a limiting step on the outer surface thereof, and the limiting step is used for abutting against the end surface of the connecting body in the first state so as to limit the longitudinal movement of the connecting body.
In one embodiment, the keyway assembly comprises a plurality of circumferentially spaced keyways and a key disposed in each keyway, wherein each keyway comprises a first portion disposed longitudinally on an outer surface of the spindle and a corresponding second portion disposed longitudinally on an inner surface of the torque transmitter.
In one embodiment, the rotatable telescoping sub further comprises an end ring disposed on an opposite side of the mandrel from the coupling mechanism and fixedly coupled to the mandrel.
In one embodiment, the rotatable telescoping sub comprises a composite seal ring disposed between the mandrel and the end ring.
In one embodiment, the composite seal ring includes at least two of a V-ring, a rectangular ring, and an O-ring.
In one embodiment, the rotatable telescopic short section further comprises a mud scraping ring, and the mud scraping ring is mounted on the outer surface of the mandrel and is in contact with the inner surface of the body.
According to a second aspect of the present invention there is provided an acid fracturing completion string comprising a bidirectional anchoring packer, and a rotatable expansion sub as described above disposed upstream of the bidirectional anchoring packer.
Drawings
The utility model will be described in detail below with reference to the attached drawing figures, in which:
FIG. 1 is a longitudinal half-sectional view of a rotatable telescoping sub according to the present invention before it is run into a well;
FIG. 2 is an enlarged schematic view at A in FIG. 1;
FIG. 3 is an enlarged schematic view at B of FIG. 1;
FIG. 4 is a partial cross-sectional view of a rotatable telescoping sub according to the present invention, showing a keyway assembly connecting the torque-transmitting member to the mandrel;
FIG. 5 is a schematic diagram of a rotatable telescopic sub according to the present invention in a maximum tension state;
in the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.
Detailed Description
The utility model will be further explained with reference to the drawings. For ease of understanding, in the present specification, the directional terms "longitudinal" or "axial" refer to a direction along the length of the rotatable telescopic sub, i.e., a vertical direction in fig. 1, the directional terms "lateral" or "radial" refer to a direction perpendicular to the longitudinal direction or the axial direction, i.e., a horizontal direction in fig. 1, the directional terms "upstream" or "above" or the like refer to a direction close to the wellhead, i.e., a top end direction in fig. 1, and the directional terms "downstream" or "below" or the like refer to a direction away from the wellhead, i.e., a bottom end direction in fig. 1.
Figure 1 is a longitudinal half-section view of a rotatable telescoping sub 100 according to the present invention before running into a well. As shown in fig. 1, the rotatable telescopic sub 100 according to the present invention mainly includes a longitudinally extending mandrel 80, a body 20 sealingly sleeved outside the mandrel 80, and a connecting mechanism connecting the mandrel 80 and the body 20 to each other.
The mandrel 80 includes, in order from upstream to downstream, a first end 81 and a second end 82. The first end 81 of the mandrel 80 is provided with connecting threads on its outer surface for connection with corresponding threads on the outer end ring 72 for protecting the mandrel 80 from damage during longitudinal movement. The second end 82 of the mandrel 80 is also provided with connecting threads on its outer surface for connection with corresponding threads on the lower joint 11.
Fig. 2 shows an enlarged view of the upstream side portion of the rotatable telescopic sub 100 according to the present invention. As shown in fig. 2, the body 20 is sleeved outside the mandrel 80, and a combined sealing ring 70 installed on the mandrel 80 and contacting with the body 20 enables a bidirectional sealing effect between the mandrel 80 and the body 20. Meanwhile, the outer surface of the upstream side of the body 20 is provided with a coupling thread for coupling with a corresponding thread on the upper joint 10.
In a preferred embodiment according to the present invention, the combination seal ring 70 includes, but is not limited to, a V-ring, a rectangular ring, and an O-ring, and is formed by combining two or more of the above-mentioned seal rings.
Fig. 3 shows an enlarged view of the downstream side portion of the rotatable telescopic sub 100 according to the present invention. As shown in fig. 3, the connection mechanism includes a connection body 40 fixedly connected with the body 20, and a torque transmission member 30 fixedly connected with the connection body 40. Therefore, the connecting body 40 serves as a bridge to indirectly fixedly connect the body 20 and the torque transmission member 30 together.
In the embodiment shown in fig. 3, the connecting body 40 is configured as a hollow cylinder, and the outer surface thereof is provided with a boss 41, and step surfaces 44 on both sides of the boss 41 are in contact with the end surfaces of the body 20 and the torque transmitting member 30, respectively. A first connection portion 42 and a second connection portion 43 are respectively provided on both sides of the protrusion portion 41 on the outer surface of the connection body 40.
Wherein, the outer surface of the first connecting portion 42 is fixedly connected with the inner surface of the body 20 through a screw thread. Thus, the two ends of the body 20 are respectively fixed with the upper joint 10 and the first connecting portion 42 through threaded connection, so that the phenomenon that the body 20 is bounced to the outside in the extending process of the rotatable telescopic short piece 100 is avoided.
Furthermore, the outer surface of the second connecting portion 43 is fixedly connected to the inner surface of the torque transmission member 30 by a screw. As described above, the torque transmitting member 30 is indirectly fixed to the body 20 via the connecting body 40.
In the embodiment shown in FIG. 3, the torque transfer member 30 includes an inner step surface 31, thereby dividing the torque transfer member 30 into an upper section 33 and a lower section 34. As described above, the upper stage 33 of the torque transmission member 30 is screwed with the second connecting portion 43 of the connecting body 40, and the inner step surface 31 of the torque transmission member 30 abuts against the end surface of the second connecting portion 43 of the connecting body 40, so that the upper joint 10, the body 20, the torque transmission member 30, and the connecting body 40 constitute a common longitudinally movable unit. The lower section 34 of the torque transmitter 30 is connected to the spindle 80 by a keyway assembly 50 and a shear pin 60 as described below.
Fig. 4 is a partial cross-sectional view of a rotatable telescopic sub according to the present invention, showing a keyway assembly connecting torque-transmitting member 30 to mandrel 80, and as shown in fig. 4, keyway assembly 50 comprises a plurality of circumferentially spaced keyways, and a key 51 disposed in each keyway. Wherein each keyway comprises a first portion 83 arranged longitudinally on the outer surface of the spindle 80 and a corresponding second portion 32 arranged longitudinally on the inner surface of the torque transmitter 30.
During installation of the rotatable telescopic sub 100, the key 51 is first placed into the first portion 83 of the keyway disposed on the outer surface of the mandrel 80. Next, the spindle 80 is fixedly connected to the torque transmitting member 30 by aligning and inserting the second portion 32 of the keyway disposed on the inner surface of the torque transmitting member 30 with the position of the key 51.
As shown in fig. 4, a shear pin groove 61 is disposed between each adjacent two of the key grooves. As described above, the complete shear pin slot 61 is formed after the first portion 83 on the outer surface of the mandrel 80 merges with the second portion 32 on the inner surface of the torque transmitter 30. At this time, the shear pin 60 is inserted into the shear pin groove 61, and the spindle 80 is fixed to the torque transmission member 30. Wherein the entirety of the shear pin 60 passes through the torque transmitter 30 and the head 62 of the shear pin 60 is embedded in the mandrel 80.
In a preferred embodiment according to the utility model, the rotatable expansion sub 100 is provided as part of an acid-fracturing completion string and is connected to the tubing upstream thereof and provided with a bi-directional anchoring packer downstream thereof. Therefore, acid liquor can smoothly enter the producing zone before fracturing, and the production capacity is effectively improved.
In the rotatable telescopic short joint 100 according to the present invention, the initial state, the first state and the second state are included in sequence from the beginning to the end of the acidizing and fracturing process according to the different forms of the rotatable telescopic short joint 100 in different stages of the acidizing and fracturing operation.
In the initial state, the rotatable telescopic sub 100 is in a stable state due to the fixing effect of the shear pin 60 and the keyway assembly 50. At this time, the acid fracturing completion pipe is conveyed to a preset position in the well according to the design requirement of the rotatable telescopic short joint 100. And then, replacing the wellbore liquid with a completion fluid, testing the sealing capability of the bidirectional anchoring packer through annulus testing, and simultaneously carrying out various preparation works in the acidizing and fracturing operation, such as well head replacement, acid preparation and the like.
In the process of acid fracturing operation, due to the difference of the acid liquor temperature and the temperature in the well, additional tension is caused to the well completion pipe string. When the pulling force exceeds the preset shearing value of the shearing pin 60 in the telescopic short section, the shearing pin 60 is sheared off. Thus, under the action of tensile force, the whole of the upper joint 10, the body 20, the torque transmission member 30 and the connecting body 40 moves in the upstream direction relative to the mandrel 80, and the whole telescopic short joint 100 is elongated, so that the completion string is compensated. At this time, the key 51 slides longitudinally within the key groove. Fig. 5 is a schematic diagram of a rotatable telescopic sub 100 according to the present invention in a maximum tensile state, and as shown in fig. 5, this process of extending the telescopic sub due to an additional tensile force generated by a temperature difference is referred to as a first state.
Fig. 5 shows a state of the rotatable telescopic sub 100 according to the present invention after being extended, which is the most extreme position at which the rotatable telescopic sub 100 is allowed to be stretched. At this time, the mandrel 6 is in contact with the connecting body 7 to realize the transmission of the axial load.
Specifically, a limit step 84 is provided on the outer surface of the mandrel 80. As described above, in the first state, the entire body including the upper joint 10, the body 20, the torque transmission member 30, and the connecting body 40 moves upstream relative to the mandrel 80 until the end surface of the first connecting portion 41 of the connecting body 40 abuts against the stopper step 84. At this time, the entire telescopic short section 100 cannot be extended continuously. In this way, the longitudinal movement of the connecting body 40 is limited, thereby limiting the maximum compensation length of the entire telescopic sub 100.
When special conditions require acid fracturing to rotate the completion string, the rotational torque from body 20 is transmitted to mandrel 80 due to keyway assembly 50, so as to rotate the entire rotary telescoping sub 100. This process of transmitting rotational torque through the keyway assembly 50 in a rotational state is referred to as a second state.
Specifically, the rotational torque is first transmitted to the connecting body 40 and the torque transmitter 30 through the upper joint 10 and the body 20. Next, as shown in fig. 4, the torque transmission member 30 transmits the rotational torque to the mandrel 12 through the key 51, and further transmits the rotational torque to the lower joint 11 through the mandrel 12, thereby completing the rotation of the rotatable telescopic sub 100 as a whole.
In a preferred embodiment according to the present invention, the rotatable telescopic sub 100 is provided with a wiper ring 71, and the wiper ring 71 is mounted on the outer surface of the mandrel 80 and contacts the inner surface of the body 20 to keep the clearance between the body 20 and the mandrel 80 during longitudinal movement and prevent mud from intruding therein.
According to a second aspect of the utility model, there is also provided an acid fracturing completion string. The acid fracturing well completion pipe string sequentially comprises an oil pipe, a telescopic short joint, a hydraulic anchor and a bidirectional anchor from upstream to downstream. Wherein, the telescopic short section is the rotatable telescopic short section 100.
According to the utility model, there is also provided a method of sour-fracturing completion, wherein a combined string of sour-fracturing completion according to the utility model is placed in a well, and the effect of elongation of the string of sour-fracturing completion is used to compensate for the additional pulling force generated in the well due to the temperature difference between the acid temperature and the temperature in the well.
Specifically, when the additional pulling force applied to the completion string exceeds a predetermined threshold, the shear pin 60 is sheared, so that the length of the rotatable telescopic sub 100 can be longitudinally changed, thereby realizing the compensation of the completion string.
In addition, when the completion string for acid fracturing needs to be rotated in an abnormal situation, a rotation torque is transmitted to the mandrel 80 through the upper joint 10, the body 20, the connecting body 40 and the torque transmission member 30 of the rotatable telescopic nipple 100, so that the complete rotation of the completion string for acid fracturing is realized.
The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto. Those skilled in the art can easily make changes or variations within the scope of the present disclosure, and such changes or variations are intended to be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A rotatable telescopic sub (100) comprising a longitudinally extending mandrel (80), a body (20) sealingly sleeved on the outside of the mandrel (80), and a connecting mechanism connecting the mandrel (80) and the body (20) to each other,
wherein the connecting mechanism comprises a connecting body (40) fixedly connected with the body (20) and a torque transmission piece (30) fixedly connected with the connecting body (40),
wherein the torque transfer member (30) is configured to: in an initial state, connecting with the mandrel (80) through a shear pin (60) and a key groove assembly (50) arranged along the longitudinal direction; the shear pin (60) can move along the longitudinal direction in a first state after being sheared by the stress borne by the rotatable telescopic short joint (100); and in a second state requiring rotation, rotational torque from the body (20) can be transmitted to the spindle (80) through the keyway assembly (50).
2. The rotatable telescopic sub according to claim 1, characterized in that the connecting body (40) is configured as a hollow cylinder, the outer surface of which is provided with a protruding portion (41), the two sides of which are respectively provided with a first connecting portion (42) and a second connecting portion (43), the first connecting portion (41) being fixedly connected with the body (20), and the second connecting portion (43) being fixedly connected with the torque transmission member (30).
3. The rotatable telescopic sub of claim 1, characterized in that the mandrel (80) is provided on its outer surface with a stop step (84) for abutment with an end face of the connecting body (40) in the first state to limit longitudinal movement of the connecting body (40).
4. The rotatable telescopic sub of claim 1, characterized in that the keyway assembly (50) comprises a plurality of circumferentially spaced keyways, and a key (51) disposed in each keyway, wherein each keyway comprises a first portion (83) longitudinally disposed on the outer surface of the mandrel (80), and a corresponding second portion (32) longitudinally disposed on the inner surface of the torque-transmitting member (30).
5. A rotatable telescopic sub according to any of claims 1-4, characterized in that the rotatable telescopic sub (100) further comprises an end ring (72), the end ring (72) being arranged on the opposite side of the mandrel (80) from the connection means and being fixedly connected to the mandrel (80).
6. The rotatable telescoping sub of claim 5, characterized in that the rotatable telescoping sub (100) comprises a composite seal ring (70), the composite seal ring (70) being disposed between the mandrel (80) and the end ring (72).
7. The rotatable telescopic sub of claim 6, characterized in that the combined sealing ring (70) comprises at least two of a V-ring, a rectangle-ring and an O-ring.
8. The rotatable telescopic sub according to any of claims 1-4, characterized in that the rotatable telescopic sub (100) further comprises a wiper ring (71), the wiper ring (71) being mounted on the outer surface of the mandrel (80) and in contact with the inner surface of the body (20).
9. An acid fracturing completion string comprising a bidirectional anchoring packer, and a rotatable telescoping sub (100) according to any of claims 1 to 8 disposed upstream of the bidirectional anchoring packer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121550028.4U CN215860026U (en) | 2021-07-08 | 2021-07-08 | Rotatable telescopic short section and acid fracturing well completion pipe string |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121550028.4U CN215860026U (en) | 2021-07-08 | 2021-07-08 | Rotatable telescopic short section and acid fracturing well completion pipe string |
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| Publication Number | Publication Date |
|---|---|
| CN215860026U true CN215860026U (en) | 2022-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121550028.4U Active CN215860026U (en) | 2021-07-08 | 2021-07-08 | Rotatable telescopic short section and acid fracturing well completion pipe string |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117905395A (en) * | 2024-03-19 | 2024-04-19 | 中石化西南石油工程有限公司 | Multistage adjustable compensation expansion joint for test and use method thereof |
-
2021
- 2021-07-08 CN CN202121550028.4U patent/CN215860026U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117905395A (en) * | 2024-03-19 | 2024-04-19 | 中石化西南石油工程有限公司 | Multistage adjustable compensation expansion joint for test and use method thereof |
| CN117905395B (en) * | 2024-03-19 | 2024-06-04 | 中石化西南石油工程有限公司 | Multistage adjustable compensation expansion joint for test and use method thereof |
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