CN114991684B - Flexible nipple for rotary steering drilling and mounting method thereof - Google Patents
Flexible nipple for rotary steering drilling and mounting method thereof Download PDFInfo
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- CN114991684B CN114991684B CN202210847409.1A CN202210847409A CN114991684B CN 114991684 B CN114991684 B CN 114991684B CN 202210847409 A CN202210847409 A CN 202210847409A CN 114991684 B CN114991684 B CN 114991684B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/05—Swivel joints
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B44/00—Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions
Abstract
The invention relates to the technical field of drilling equipment, in particular to a flexible short section for rotary steering drilling and an installation method thereof. Including first assembly body and second assembly body, the lower extreme of first assembly body is equipped with first assembly portion, and the upper end of second assembly body is equipped with second assembly portion, and first assembly portion can cooperate with second assembly portion and form flexible chamber, is provided with flexible festival in the flexible chamber, and the through-hole has been seted up at the center of flexible festival, is provided with the plasticity pipe in the through-hole, the plasticity pipe run through the through-hole extend to along both ends with first assembly body, the cooperation of second assembly body. Through the matching effect of the flexible joint in the flexible cavity, particularly the flexible cavity wraps and covers the flexible joint, the degree of freedom of the flexible joint in the rotating direction is reduced, so that the dynamic stress on the flexible short joint is reduced, and the problem of vibration frequency increase of a drill string caused by the increase of the dynamic stress is effectively solved; effectively reduce the operation parameter adjustment number of times that causes because of the vibration problem, effectively improved the quality in well.
Description
Technical Field
The invention relates to the technical field of drilling equipment, in particular to a flexible short section for rotary steering drilling and an installation method thereof.
Background
The rotary steering system overcomes the defects of easy pressure supporting, difficult track control, slow drilling speed, difficult horizontal section extension and the like of sliding steering drilling, is a core tool for economically and effectively developing long-horizontal-section unconventional and ultra-deep oil and gas reservoirs, and has urgent requirements on rotary steering tools for the exploration and development of unconventional oil and gas reservoirs such as conglomerate oil reservoirs, shale gas and the like in China.
However, the research and development of the domestic rotary guide system have the problems of low technical indexes, unstable performance, short service life and the like. The rotary steering drilling tool assembly used in certain oil field in China has deviation in the deflecting and steering process and causes serious influence on the track control of drilling along with the continuous vibration of a drill column.
In view of the above, a flexible short joint capable of preventing the drill string from increasing the dynamic stress vibration frequency of the drill string due to the use of the flexible short joint is needed.
Disclosure of Invention
The invention aims to provide a flexible short section for rotary steering drilling, which is used for solving the problem that the dynamic stress vibration frequency of a drill column is increased due to the conventional flexible short section; the installation method of the flexible short section for the rotary steering drilling is used for carrying out dynamic safety optimization on a rotary steering structure, namely accurately and reasonably installing the position of the flexible short section.
The invention is realized by the following technical scheme:
a flexible short section for rotary steering drilling comprises a first assembly body and a second assembly body, wherein the first assembly body is hollow inside, a first assembly portion is arranged at the lower end of the first assembly body, a second assembly portion is arranged at the upper end of the second assembly body, the first assembly portion and the second assembly portion can be matched to form a flexible cavity, a flexible joint is arranged in the flexible cavity, a through hole is formed in the center of the flexible joint, a plastic pipe is arranged in the through hole, the plastic pipe penetrates through the through hole and extends to be matched with the first assembly body and the second assembly body along two ends, a sealing sleeve is sleeved on the periphery of the flexible cavity, a first centering sleeve is sleeved on the periphery of the first assembly body, and a second centering sleeve is sleeved on the periphery of the second assembly body. It should be noted that, based on the above structure, a flexible cavity is formed by matching the first assembling portion and the second assembling portion, and then the first assembling body and the second assembling body are connected by a flexible joint arranged in the flexible cavity, wherein the first assembling body is located above, namely, on the side far away from the drill bit, and the second assembling body is located below, namely, on the side close to the drill bit. It should also be noted that the flexible joint and the flexible cavity are movably fixed, i.e., the first assembly body can rotate relative to the second assembly body via the flexible joint. It is further described that the flexible short section in the prior art is generally connected by means of a hinge and the like, and has a high degree of freedom in the rotation direction, and in the process of driving the drill bit, the drill string is subjected to a large dynamic stress under the influence of the rotation of the drill bit, that is, the dynamic stress on the flexible short section on the drill string is most obvious, and the drill string has a large vibration frequency in the most intuitive manner. In this regard, the first assembly body and the second assembly body wrap and cover the flexible joint through mutual occlusion of the flexible cavity, the degree of freedom of the first assembly body and the second assembly body in the rotation direction is obviously lower than that of the prior art, the structure is subjected to lower dynamic stress, and the problem that the vibration frequency of a drill string is increased due to the influence of the dynamic stress is effectively solved.
Furthermore, the periphery of the sealing sleeve is provided with two limiting rings for limiting a rotation angle, and the two limiting rings are respectively fixed on the first righting sleeve and the second righting sleeve. Based on above-mentioned structure, the rotation angle that the retainer ring can assemble first assembly body and second is restricted, avoids excessive rotation to cause irreversible influence to the drilling string.
Furthermore, the first assembly portion comprises a first assembly arm, one end of the first assembly arm is a first engagement portion, the other end of the first assembly arm is a connecting portion, the connecting portion is detachably connected with the first assembly body, a second engagement portion symmetrical to the first engagement portion is arranged on the first assembly portion, and the first assembly portion and the second assembly portion are identical in structure and are engaged with each other. Based on above-mentioned structure, first assembly portion and second assembly portion interlock each other to can rotate through the flexible festival of cooperation, compare in prior art, above-mentioned structure is lower in the ascending degree of freedom of direction of rotation, and the drilling string receives the dynamic stress influence of drill bit littleer.
Furthermore, matching holes are formed in the first assembling portion and the first meshing portion and the second meshing portion of the second assembling portion, four matching columns are arranged on the periphery of the flexible joint, the four matching columns are distributed in a circumferential array mode with the axis of the flexible joint, and the matching columns are matched with the matching holes. Based on above-mentioned structure, flexible festival realizes being connected through mutually supporting of cooperation post and mating holes, when the drill bit need make a deviation and rotate, will make the second assembly body have the tendency of taking place the pivoted, and this moment under the effect of cooperation post and mating holes, the rotation can take place for the second assembly body.
Still further, still include the vibration detecting element, the vibration detecting element includes: control head, battery nipple joint and be used for the survey flexible festival vibration frequency's the nipple joint of testing vibration, flexible festival is close to the steady flow chamber has still been seted up to the one end of second assembly body, the control head sets up the inlet in steady flow chamber, just the control head can control opening and shutting of steady flow chamber, the one end of the nipple joint of testing vibration with the control head is connected, the other end with the battery nipple joint is connected. Because the deflecting state of the drill string is directly influenced by the vibration frequency of the drilling tool assembly, in order to avoid the deviation of the drilling track caused by the overlarge vibration frequency, the vibration frequency of the drill string is detected in real time by arranging a vibration detection unit in the flexible short section, and meanwhile, the monitoring and the alarming are carried out through a preset frequency threshold value.
Further, the vibration measuring nipple comprises: vibration detection subassembly, rotational speed detection subassembly and power supply module, the power supply module with rotational speed detection subassembly is connected, the rotational speed detection subassembly includes: MCU, tacho sensor, clock chip, high temperature storage module and USB communication module, vibration detection subassembly with MCU signal connection, tacho sensor, clock chip, high temperature storage module and USB communication module all with MCU signal connection, USB communication module still with ground control system signal connection. To the nipple joint that shakes of surveying, adopt flexible wire to connect between each module, and preferentially adopt and visit the design of pipe formula, be convenient for make and maintain. A vibration reduction assembly is also disposed within the power assembly, and the vibration detection assembly is preferably a three-axis accelerometer.
Preferably, the flow stabilizing cavity comprises a plurality of flow stabilizing channels, and the flow stabilizing channels are formed by lofting and cutting closed graphs arranged on the upper end face and the lower end face of the flexible joint at intervals. It should be noted that, for the flow stabilizing cavity, a plurality of flow stabilizing channels are included, and the preferred number of the flow stabilizing channels is 4, and the flow stabilizing channels are distributed in a circumferential array by taking the axis of the flexible joint as a reference. It should also be noted that it is preferable for the cross-sectional shape of the ballast channel to be a sector or circle, and the channel is formed in the flexible joint by loft cutting.
A mounting method for a flexible short joint for rotary steering drilling specifically comprises the following steps: step 1, mounting a flexible short section, namely mounting all the components of the flexible short section according to a matching relationship; step 2, debugging the vibration detection unit, and debugging the vibration detection unit at an initial position; and 3, assembling and installing the drilling tool, namely assembling and installing the drill bit, the rotary steering tool, the flexible short section and the stabilizer, wherein the distance between the flexible short section and the drill bit is 6-8m. It should be noted that, in combination with the above explanation, the downhole vibration detection assembly is used to control the drilling tool assembly with the rotary guiding tool, so that the number of times of adjusting the operation parameters caused by the vibration problem can be effectively reduced, more specifically, for the flexible short section, the flexible short section is also related to the specific position where the flexible short section is installed on the drill string, and through an actual test, the reasonable installation position of the flexible short section is set to be 6m to 8m away from the drill bit.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. according to the invention, through the matching effect of the flexible joint in the flexible cavity, particularly the flexible cavity wraps and covers the flexible joint, the degree of freedom of the flexible joint in the rotation direction is reduced, so that the dynamic stress on the flexible short joint is reduced, and the problem of vibration frequency increase of a drill string caused by the increase of the dynamic stress is effectively avoided;
2. the invention utilizes the underground vibration detection component to control the drilling tool assembly with the rotary guiding tool, thereby effectively reducing the adjustment times of the operation parameters caused by the vibration problem and effectively improving the quality of the well;
3. according to the invention, the mounting position of the flexible short section is reasonably adjusted, so that the dynamic stress on the flexible short section is reduced, the drill string is not easy to generate fatigue damage, and the service life of the drilling tool assembly is greatly prolonged.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic structural view of a first assembly body and a second assembly body in a matched state;
FIG. 2 is a top view of a first assembly and a second assembly in a mated state;
FIG. 3 is a schematic structural view of a flexible joint;
FIG. 4 is a schematic view of the fitting state structure of the sealing sleeve;
FIG. 5 is a schematic structural view of example 1 of the present invention;
FIG. 6 is a sectional view of example 1 of the present invention;
FIG. 7 is a partial structural sectional view of embodiment 2 of the present invention;
FIG. 8 is a schematic view of a flexible joint structure according to embodiment 2 of the present invention;
fig. 9 is a schematic block diagram of an electrical structure of the vibration detection unit.
Reference numbers and corresponding part names in the drawings:
1-a first assembly body, 11-a first assembly part, 111-a first mounting arm, 112-a first engagement part, 113-a connecting part, 114-a second engagement part, 115-a matching hole, 12-a first righting sleeve, 13-a second righting sleeve, 2-a second assembly body, 21-a second assembly part, 3-a flexible cavity, 4-a flexible joint, 41-a through hole, 42-a plastic pipe, 43-a matching column, 44-a flow stabilizing cavity, 45-a flow stabilizing channel, 5-a sealing sleeve, 6-a limiting ring, 7-a control head, 8-a battery short section and 9-a vibration measuring short section.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention. It should be noted that the present invention is in practical development and use stage.
Example 1:
referring to fig. 1 to 6 together, a flexible short joint for rotary steerable drilling includes a first assembly body 1 with a hollow interior and a second assembly body 2 with a hollow interior, a first assembly portion 11 is disposed at a lower end of the first assembly body 1, a second assembly portion 21 is disposed at an upper end of the second assembly body 2, the first assembly portion 11 and the second assembly portion 21 can cooperate to form a flexible cavity 3, a flexible joint 4 is disposed in the flexible cavity 3, a through hole 41 is disposed at a center of the flexible joint 4, a plastic pipe 42 is disposed in the through hole 41, the plastic pipe 42 penetrates through the through hole 41 and extends to cooperate with the first assembly body 1 and the second assembly body 2 along two ends, a sealing sleeve 5 is sleeved on an outer periphery of the flexible cavity 3, a first centering sleeve 12 is sleeved on an outer periphery of the first assembly body 1, and a second centering sleeve 13 is sleeved on an outer periphery of the second assembly body 2.
It should be noted that, the structure of the flexible short section in the prior art can receive a large dynamic stress when deflecting, so that the flexible short section has a high vibration frequency, which often causes fatigue stress damage to the flexible short section, and finally affects the drilling process, or even causes more serious consequences. In view of the above circumstances, a flexible short joint for rotary steerable drilling is proposed, based on the above specific structure, a flexible cavity 3 is formed by matching a first assembling portion 11 and a second assembling portion 21, and then a first assembly body 1 and a second assembly body 2 are connected by a flexible joint 4 arranged in the flexible cavity 3, wherein the first assembly body 1 is located above, i.e., on the side away from a drill bit, and the second assembly body 2 is located below, i.e., on the side close to the drill bit. It should be further noted that the flexible joint 4 and the flexible cavity 3 are movably fixed, that is, the first assembly body 1 can rotate relative to the second assembly body 2 through the flexible joint 4. It should be further noted that the flexible short section in the prior art is generally connected by a hinge or the like, and has a high degree of freedom in the rotation direction, and in the process of driving the drill bit, the drill string is subjected to a large dynamic stress under the influence of the rotation of the drill bit, that is, the dynamic stress on the flexible short section on the drill string is most obvious, and the drill string has a large vibration frequency in the most intuitive manner. In this regard, the first assembly body 1 and the second assembly body 2 wrap and cover the flexible joint 4 through mutual engagement of the flexible cavities 3, the degree of freedom of the first assembly body in the rotation direction is obviously lower than that of the prior art, the structure is subjected to smaller dynamic stress, and the problem that the vibration frequency of the drill string is increased due to the influence of the dynamic stress is effectively solved.
It should be noted that two limiting rings 6 for limiting a rotation angle are arranged on the outer periphery of the sealing sleeve 5, and the two limiting rings 6 are respectively fixed on the first centering sleeve 12 and the second centering sleeve 13. Based on above-mentioned structure, the turned angle that the retainer ring 6 can assemble first assembly body 1 and second with limits, avoids excessively rotating to cause irreversible influence to the drilling string. Under the action of the limiting ring 6, the rotating angle range of the flexible short section is controlled to be 0-55 degrees. It should be noted that, the side of the matching column 43 away from the through hole 41 is a curved surface and is recessed toward the direction of the through hole 41, and when the matching column 43 is a concave surface, the rotation angle of the flexible short joint can be greatly increased compared with the prior art. More specifically, the rotation range of the flexible joint 4 in the flexible cavity 3 is limited by the fit clearance between the fit column 43 and the fit hole 115, for example, when the flexible short joint which is initially vertical is rotated to the left, the fit column 43 on the left side is concave, the fit column 43 on the right side is convex, and when the outer side surface of the fit column 43 is concave, the limitation on the first engagement portion 112 or the second engagement portion 114 is smaller, i.e. the limitation on the rotation angle is larger.
It should be noted that the first assembling portion 11 includes a first mounting arm 111, one end of the first mounting arm 111 is a first engaging portion 112, the other end is a connecting portion 113, the connecting portion 113 is detachably connected to the first assembly 1, a second engaging portion 114 symmetrical to the first engaging portion 112 is disposed on the first assembling portion 11, and the first assembling portion 11 and the second assembling portion 21 have the same structure and are engaged with each other. Based on the above structure, the first assembling portion 11 and the second assembling portion 21 are engaged with each other and can rotate by matching the flexible joint 4, compared with the prior art, the above structure has lower freedom in the rotation direction, and the drill string is less affected by the dynamic stress of the drill bit. The connecting portion 113 and the first assembling portion 11/the second assembling portion 21 are configured to be detachably connected, so that the engagement degree of the flexible cavity 3 to the flexible joint 4 can be indirectly adjusted by adjusting the fixing degree of the connecting portion 113. And the inner walls of the first and second engagement portions 112 and 114 are rounded.
The first engaging portion 112 and the second engaging portion 114 of the first assembling portion 11 and the second assembling portion 21 are both provided with engaging holes 115, four engaging columns 43 are arranged on the outer periphery of the flexible joint 4, the four engaging columns 43 are distributed in a circumferential array around the axis of the flexible joint 4, and the engaging columns 43 are engaged with the engaging holes 115. Based on above-mentioned structure, flexible festival 4 realizes being connected through the mutually supporting of cooperation post 43 with mating holes 115, when the drill bit need make the syncline and rotate, will make second assembly body 2 have the trend of taking place the pivoted, and this moment under the effect of cooperation post 43 with mating holes 115, second assembly body 2 can take place to rotate. Based on the above structure, when the first fitting part 11 and the second fitting part 21 are engaged with each other, the flexible joint 4 is disposed in the flexible chamber 3 through the fitting post 43 and the fitting hole 115.
Example 2:
this example describes only the portions different from example 1, specifically:
as shown in fig. 7 to 9, the apparatus further includes a vibration detection unit, and the vibration detection unit includes: control head 7, battery nipple joint 8 and be used for the survey 4 vibration frequency's of flexible festival short section 9 that shakes, flexible festival 4 is close to steady flow chamber 44 has still been seted up to the one end of second assembly body 2, control head 7 sets up the inlet in steady flow chamber 44, just control head 7 can control opening and shutting of steady flow chamber 44, the one end of short section 9 that shakes with control head 7 is connected, the other end with battery nipple joint 8 is connected. Because the deflecting state of the drill string is directly influenced by the vibration frequency of the drilling tool assembly, in order to avoid the deviation of the drilling track caused by the overlarge vibration frequency, the vibration frequency of the drill string is detected in real time by arranging a vibration detection unit in the flexible short section, and meanwhile, the monitoring and the alarming are carried out through a preset frequency threshold value. It should be noted that the oil or drilling fluid at the bottom of the well will be conveyed outwards through the through hole 41 inside the flexible sub, and the plastic pipe 42 is preferably a titanium alloy hose, and it is well known to those skilled in the art that when fluid flows in the pipeline, the pipeline will also vibrate, i.e. the flexible sub will also vibrate under the action of the internal fluid, and in the case of the flexible sub, the flexible sub will also have an adverse effect on the drilling trajectory. In view of this situation, by arranging the surge chamber 44 in the flexible joint 4, when the vibration frequency detected by the vibration detection unit exceeds the threshold set by the ground control system, the MCU controls the control head 7 to make the surge chamber 44 in an open state, where it should be noted that the control head 7 may be an electromagnetic valve, and when the surge chamber 44 is in the open state, a part of the fluid will pass through the surge chamber 44. The flow stabilizing cavity 44 includes a plurality of flow stabilizing channels 45, each flow stabilizing channel 45 is a channel cut by lofting a closed figure with a gap between the upper end and the lower end, and in this embodiment, the cross section of each flow stabilizing channel 45 is a sector, that is, when a fluid passes through the flow stabilizing channel 45, the impact force in the direction other than the conveying direction is reduced, and the fluid rotates in the desired conveying direction to convey the fluid, so that the vibration impact on the flexible joint 4 during the fluid conveying process is reduced.
It should be noted that the vibration measuring nipple 9 includes: vibration detection subassembly, rotational speed detection subassembly and power supply module, power supply module with rotational speed detection subassembly is connected, rotational speed detection subassembly includes: MCU, speed sensor, clock chip, high temperature storage module and USB communication module, vibration detection subassembly with MCU signal connection, speed sensor, clock chip, high temperature storage module and USB communication module all with MCU signal connection, USB communication module still with ground control system signal connection. To the nipple joint 9 that shakes, adopt flexible wire to connect between each module, and the preferential pipe formula design of adopting of exploring, be convenient for make and maintain. A vibration reduction assembly is also disposed within the power assembly, and the vibration detection assembly is preferably a three-axis accelerometer. It should also be noted that the above-mentioned modular components are conventional choices in the prior art.
In this embodiment, it is preferable that the flow stabilizing cavity 44 includes a plurality of flow stabilizing channels 45, and the flow stabilizing channels 45 are formed by lofting and cutting closed patterns on the upper and lower end surfaces of the flexible joint 4 at intervals. It should be noted that, for the flow stabilizing cavity 44, a plurality of flow stabilizing channels 45 are included, and the number of the flow stabilizing channels 45 is preferably 4, and the flow stabilizing channels are distributed in a circumferential array by taking the axis of the flexible joint 4 as a reference. It should also be noted that it is preferable for the cross-sectional shape of the ballast channel 45 to be a sector or a circle, and the channel is formed in the flexible joint 4 by loft cutting.
A mounting method for a flexible short joint for rotary steering drilling specifically comprises the following steps: step 1, mounting a flexible short section, namely mounting all the components of the flexible short section according to a matching relationship; step 2, debugging the vibration detection unit, and debugging the vibration detection unit at an initial position; and 3, assembling and installing the drilling tool, namely assembling and installing the drill bit, the rotary guiding tool, the flexible short section and the stabilizer, wherein the distance between the flexible short section and the drill bit is 6-8m. It should be noted that, in combination with the above explanation, the downhole vibration detection assembly is used to control the drilling tool assembly with the rotary guiding tool, so that the number of times of adjusting the operation parameters caused by the vibration problem can be effectively reduced, more specifically, for the flexible short section, the flexible short section is also related to the specific position where the flexible short section is installed on the drill string, and through an actual test, the reasonable installation position of the flexible short section is set to be 6m to 8m away from the drill bit.
In order to explore the reasonable position of the flexible short section during installation, a drilling tool assembly is subjected to dynamic finite element model analysis, wherein the drilling tool is regarded as a three-dimensional elastic beam, the deformation of a drilling string is small deformation, the influence of a drilling string joint is ignored, the cross section of a well hole is circular, a dynamic balance equation of a general dynamic system is adopted, the equation is dispersed in space and time, a finite element method is used for solving the equation, a node iteration method is used for spatial dispersion, and a Newmark method is adopted for time dispersion.
Based on the method, the distances from the flexible short section to the drill bit are respectively set to be 6m, 7m, 8m, 9m and 10m, and the reasonable installation distance of the flexible short section is 6m to 8m by measuring the dynamic stress of the flexible short section at different distances. Within this distance range, dynamic safety optimization of the structure of the drilling tool assembly can be performed.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A flexible short joint for rotary steering drilling is characterized in that: the assembly structure comprises a first assembly body (1) and a second assembly body (2) which are hollow inside, wherein a first assembly portion (11) is arranged at the lower end of the first assembly body (1), a second assembly portion (21) is arranged at the upper end of the second assembly body (2), the first assembly portion (11) and the second assembly portion (21) can be matched to form a flexible cavity (3), a flexible joint (4) is arranged in the flexible cavity (3), a through hole (41) is formed in the center of the flexible joint (4), a plastic pipe (42) is arranged in the through hole (41), the plastic pipe (42) penetrates through the through hole (41) and extends to be matched with the first assembly body (1) and the second assembly body (2) along two ends, a sealing sleeve (5) is sleeved on the periphery of the flexible cavity (3), a first centering sleeve (12) is sleeved on the periphery of the first assembly body (1), and a second centering sleeve (13) is sleeved on the periphery of the second assembly body (2).
2. A flexible sub for use in rotary steerable drilling according to claim 1, wherein: two limiting rings (6) used for limiting a rotation angle are arranged on the periphery of the sealing sleeve (5), and the two limiting rings (6) are respectively fixed on the first righting sleeve (12) and the second righting sleeve (13).
3. A flexible sub for use in rotary steerable drilling according to claim 2, wherein: first assembly portion (11) are including first installation arm (111), the one end of first installation arm (111) is first interlock portion (112), and the other end is connecting portion (113), connecting portion (113) with first assembly body (1) can be dismantled and be connected, be provided with on first assembly portion (11) with second interlock portion (114) of first interlock portion (112) symmetry, first assembly portion (11) with the structure of second assembly portion (21) is the same and interlock each other.
4. A flexible sub for use in rotary steerable drilling according to claim 3, wherein: the first assembling portion (11) and the first meshing portion (112) and the second meshing portion (114) of the second assembling portion (21) are provided with matching holes (115), four matching columns (43) are arranged on the periphery of the flexible joint (4), the four matching columns (43) are distributed in a circumferential array mode with the axis of the flexible joint (4), and the matching columns (43) are matched with the matching holes (115).
5. A flexible sub for use in rotary steerable drilling according to claim 1, wherein: still include the vibration detecting element, the vibration detecting element includes: control head (7), battery nipple joint (8) and be used for the survey flexible festival (4) vibration frequency's survey nipple joint (9), flexible festival (4) are close to steady flow chamber (44) have still been seted up to the one end of second assembly body (2), control head (7) set up the inlet of steady flow chamber (44), just control head (7) can be controlled the opening and shutting of steady flow chamber (44), the one end of survey nipple joint (9) with control head (7) are connected, the other end with battery nipple joint (8) are connected.
6. A flexible sub for use in rotary steerable drilling according to claim 5, wherein: the vibration measuring nipple (9) comprises: vibration detection subassembly, rotational speed detection subassembly and power supply module, the power supply module with rotational speed detection subassembly is connected, the rotational speed detection subassembly includes: MCU, tacho sensor, clock chip, high temperature storage module and USB communication module, vibration detection subassembly with MCU signal connection, tacho sensor, clock chip, high temperature storage module and USB communication module all with MCU signal connection, USB communication module still with ground control system signal connection.
7. A flexible sub for use in rotary steerable drilling according to claim 6, wherein: the flow stabilizing cavity (44) comprises a plurality of flow stabilizing channels (45), and the flow stabilizing channels (45) are formed by lofting and cutting closed graphs which are arranged on the upper end face and the lower end face of the flexible joint (4) at intervals.
8. A mounting method for a flexible short joint for rotary steering drilling is characterized by comprising the following steps: a flexible short joint for rotary steerable drilling based on claim 4 or claim 7, comprising the following steps:
step 1, mounting a flexible short section, namely mounting all the components of the flexible short section according to a matching relationship;
step 2, debugging the vibration detection unit, and debugging the vibration detection unit at an initial position;
and 3, assembling and installing the drilling tool, namely assembling and installing the drill bit, the rotary guiding tool, the flexible short section and the stabilizer, wherein the distance between the flexible short section and the drill bit is 6-8m.
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| CN202210847409.1A CN114991684B (en) | 2022-07-19 | 2022-07-19 | Flexible nipple for rotary steering drilling and mounting method thereof |
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| CN202210847409.1A CN114991684B (en) | 2022-07-19 | 2022-07-19 | Flexible nipple for rotary steering drilling and mounting method thereof |
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| CN114991684B true CN114991684B (en) | 2022-10-25 |
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