CN112664149A - Flexible short section with axial elastic long rod bearing force - Google Patents
Flexible short section with axial elastic long rod bearing force Download PDFInfo
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- CN112664149A CN112664149A CN202110165138.7A CN202110165138A CN112664149A CN 112664149 A CN112664149 A CN 112664149A CN 202110165138 A CN202110165138 A CN 202110165138A CN 112664149 A CN112664149 A CN 112664149A
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Abstract
A flexible short section bearing force by an axial elastic long rod body comprises an upper joint, a lower joint, a connecting shaft, a supporting sleeve and an elastic bearing rod, wherein the upper joint and the lower joint are hinged and connected by the connecting shaft, the supporting sleeve is fixedly sleeved on the connecting shaft, an arc-shaped guide groove is formed in the outer circumferential surface of the supporting sleeve, the elastic bearing rod is an elastic structure rod body, two ends of the elastic bearing rod are respectively limited and fixed on the upper joint and the lower joint, the middle part of the flexible short section presents a two-dimensional curve turning shape and penetrates through the guide groove, the flexible short section takes the long rod-shaped elastic bearing rod as the elastic structure rod body, the upper joint is driven to deflect relative to the lower joint by the stress bending of the elastic bearing rod, the flexible short section is suitable for an inclined bending structure of an oil well, and has strong dynamic automatic resetting capability in the drilling or logging process, the adaptability of the elastic bearing rod and the bending curvature of the well, the device has the advantages of high functional stability, good working reliability and good power guidance.
Description
Technical Field
The invention relates to a flexible short section, in particular to a flexible short section with an axial elastic long rod body for bearing force.
Background
The flexible short section is a matched downhole tool for drilling or logging operation of a large inclined well and a horizontal well in an oil field, and is used for adjusting the downhole posture of a downhole drilling tool or a logging instrument to adapt to the change of the curvature of a borehole, so that operation accidents caused by blockage of the downhole drilling tool or the logging instrument are prevented; at present, the flexible nipple joint that uses in the production mainly has two kinds of structural style of ball shell type and multisection chain, wherein: the ball head sleeve type flexible short section is characterized in that an upper joint and a lower joint are connected by utilizing a matching structure of a ball head ball sleeve, the upper joint and the lower joint are deflected under the action of a side wall of a well hole, a flexible cylinder body is formed by combining multi-stage ring sheets, the flexible cylinder body is bent under the constraint of the shape of the well hole, the problems of response delay and low efficiency existing in the aspects of dynamic adaptability and coordination change capability of the bending curvature of the well hole of the oil well are obviously reflected because the flexible short sections in two structural forms passively depend on the control constraint of the well hole structure of the oil well and can only return elastic deformation under the action of self gravity, in the actual production, the tendency of blocking is increased even because the friction force between the flexible short section and the well wall is increased, and the requirements of drilling or logging operation of a large inclined well and a horizontal well are difficult to be met, especially, in recent years, the development of a drill bit logging technology is fast, the characteristics of small rod diameter and high precision of a cross-drill-bit logging instrument string provide higher requirements for the performance of a matched flexible short section, and the functional efficiency needs to be improved urgently, so that the structure of the flexible short section of the oil field needs to be further improved and perfected, and the requirements of the matched production technology of a large inclined well and a horizontal well of the oil field are met.
Disclosure of Invention
The invention aims to provide a flexible short section with an axial elastic long rod body for bearing force, which improves the working efficiency of drilling and logging of an oil field horizontal well.
A flexible short section stressed by an axial elastic long rod body comprises: the upper end of the upper joint and the lower end of the lower joint are respectively provided with a threaded connection structure for being connected with a drilling rod of a drilling tool or a logging instrument, the lower end of the upper joint and the upper end of the lower joint are hinged with each other by the connecting shaft, the supporting sleeve is fixedly sleeved on the connecting shaft, the connecting structure among the connecting shaft, the upper joint and the lower joint is limited and positioned, the outer circumference of the supporting sleeve is provided with an arc-shaped guide groove, the elastic bearing rod is an elastic structure rod body, two ends of the elastic bearing rod are respectively limited and fixed on the upper joint and the lower joint, the middle part of the elastic bearing rod is in a two-dimensional curve rotary shape on the section vertical to the connecting shaft, the elastic modulus of the elastic bearing rod is increased, and the elastic bearing rod penetrates through the guide groove formed in the outer circumferential surface of the support sleeve.
Further, preferably said flexible short section of axial elasticity stock body bearing force still includes: wire plug and wire socket, simultaneously, elasticity bearing rod is for seting up the elastic construction body of rod of central hole, the wire plug is installed in the top connection, the wire socket is installed in the lower clutch, the wire plug with connecting wire between the wire socket is followed pass in the central hole of elasticity bearing rod, realize the wire plug with switch on of electric power between the wire socket.
Still further, preferably the two-dimensional curve gyration shape in the middle part of the elastic bearing rod is a circular arc gyration shape, and the arc top of each circular arc is respectively propped against the upper joint and the inner side wall of the lower joint so as to improve the stability of the whole structure when the upper joint and the lower joint rotate relatively.
Further, in order to enhance the deformation adaptability of the elastic pressure-bearing rod and reduce the deformation internal friction resistance, a gap distance Δ r is preferably preset between the elastic pressure-bearing rod and the guide groove formed on the outer circumferential surface of the support sleeve.
The invention has the advantages that the flexible short section which is stressed by the axial elastic long rod body takes the long rod-shaped elastic bearing rod as the elastic structure rod body, the upper joint is driven to deflect relative to the lower joint by the stress bending of the elastic bearing rod to adapt to the inclined bending structure of an oil well, the elastic modulus of the elastic bearing rod is improved by adopting a two-dimensional curve rotary shape, the larger the elastic deformation of the elastic bearing rod is, the larger the elastic restoring force is, the stronger the dynamic automatic resetting capability is generated along with the larger the elastic restoring force is in the process of drilling or logging, the stronger the automatic resetting capability can improve the adaptability of the elastic bearing rod and the bending curvature of the well hole, the coordination capability of the elastic bearing rod and the bending direction of the well hole can be enhanced, the functional stability is high, the working reliability is good, meanwhile, the dynamic guidance performance is good, and the friction resistance between the flexible short section and the wall of the oil well can be reduced, the working efficiency of the horizontal well drilling or logging of the oil field is improved.
Drawings
FIG. 1 is a sectional view of an assembly structure of a flexible short section bearing force by an axial elastic long rod body.
Fig. 2 is a cross-sectional view taken along line a-a of fig. 1.
Fig. 3 is a schematic diagram of the overall deflection state of the flexible short section bearing force by the axial elastic long rod body.
Fig. 4 is a partial schematic view of the left side deflection state of the elastic pressure-bearing rod.
FIG. 5 is a partial view of the right side of the resilient support rod in a deflected state.
Detailed Description
The technical solution claimed by the present invention is further described below with reference to the specific embodiments and the accompanying fig. 1 to 5.
A flexible short section suitable for logging through a drill bit and comprising an axial elastic long rod body bearing force is composed of an upper joint 1, a lower joint 2, a connecting shaft 3, a supporting sleeve 4, an elastic bearing rod 5, a lead plug 6 and a lead socket 7, wherein the upper end of the upper joint 1 is matched with a split screw sleeve 8 to form an external thread connecting structure, the lower end of the lower joint 2 is provided with an internal thread, the lower end of the upper joint 1 and the upper end of the lower joint 2 are hinged and connected with each other by the connecting shaft 3, the supporting sleeve 4 is sleeved on the connecting shaft 3 and is fixedly connected with the connecting shaft 3 in a limiting way through a jackscrew 10, the outer circumferential surface of the supporting sleeve 4 is provided with an arc-shaped guiding groove and a process blind hole 9 for assisting in adjusting the supporting sleeve 4 in the assembling process, so that the supporting sleeve 4 and the connecting shaft 3 are respectively used for connecting and installing the axle holes of the jackscrew 10 to be aligned with each other, the elastic bearing rod 5 is an elastic structure rod body provided with a central inner hole, two ends of the elastic bearing rod are respectively limited and fixed on the upper joint 1 and the lower joint 2, the middle part of the elastic bearing rod is in an arc rotary shape on a section vertical to the connecting shaft 3, one side of the elastic bearing rod is provided with 1 central arc, the central arc penetrates through the guide groove arranged on the outer circumferential surface of the support sleeve 4, arcs are propped against the inner side wall of the upper joint 1, the preset gap distance Deltar between the elastic bearing rod 5 and the guide groove is 0.5-1.5 mm, the other side of the elastic bearing rod is provided with 2 rotary arcs, the rotary arcs are symmetrically arranged on two sides of the central arc, the arcs are respectively propped against the inner side walls of the upper joint 1 and the lower joint 2 on the corresponding other sides, the lead plug 6 is arranged in the upper joint 1, and the lead socket 7 is arranged in the lower joint 2, and a connecting wire between the wire plug 6 and the wire socket 7 passes through the central inner hole of the elastic bearing rod 5, so that the connecting wire is effectively protected.
The flexible short section with the force bearing function by the axial elastic long rod body is used in the operation process of the storage type over-drill logging (TBL) of the horizontal well, the flexible short section with the force bearing function by the axial elastic long rod body is connected to a logging instrument string, is delivered underground while drilling, and is controlled to release the logging instrument string connected with the flexible short section with the force bearing function by the axial elastic long rod body after reaching a logging station, so that the logging instrument string penetrates through a TBL drill bit and enters a bare hole oil well; in the releasing and delivering or lifting well logging process of the well logging instrument string, when a bending section of an oil well is met, the elastic pressure bearing rod 5 is stressed to bend to drive the upper joint 1 to generate a deflection angle a relative to the lower joint 2, the elastic pressure bearing rod 5 is a structural rod body with a larger elastic modulus, the larger the elastic deformation is, the larger the elastic restoring force is, and the stronger the dynamic automatic resetting capability accompanying the generation is, the automatic resetting capability not only comprises the adaptability of the elastic deformation of the elastic pressure bearing rod 5 and the bending curvature of the well hole, but also comprises the coordination capability of the connecting shaft 3 in the radial self-rotation adjustment of the well hole to enable the variability direction of the elastic pressure bearing rod 5 and the bending direction of the well hole, and meanwhile, the elastic pressure bearing rod 5 is long and is provided with outstanding power guidance, so that the acting force between the flexible short section stressed by the axial elastic long rod body and the wall of the oil well is reduced, reducing the frictional resistance between the two.
Meanwhile, the elastic pressure-bearing rod 5 is guided by the support sleeve 4, the deflection angle a is respectively rotated along the left direction and the right direction on the cross section vertical to the connecting shaft 3, the maximum amplitude of the deflection angle a is 5 degrees, the structural state of the elastic pressure-bearing rod 5 which is bent and deformed along the left direction and the right direction is respectively taken as an example of the structural direction shown in fig. 4 and 5, when the elastic pressure-bearing rod is bent towards the right side, the inner side of the arc top of the central arc B at the right side is attached to the support sleeve 4, the outer sides of the arc tops of the rotary arc C at the left side and the rotary arc D at the left side are respectively abutted against the inner side walls of the upper joint 1 and the lower joint 1, when the elastic pressure-bearing rod is bent towards the left side, the outer side of the arc top of the central arc B at the right side is abutted against the inner side wall of the upper joint 1, and the outer side of the arc tops of the rotary arc C, therefore, no matter which direction the elastic bearing rod 5 deflects to the left or the right, stable 3-point support can be obtained, equivalent elastic deformation and automatic recovery can be realized in the left direction and the right direction, and the elastic bearing rod has reliable working stability.
Claims (4)
1. The utility model provides a flexible nipple joint by axial elasticity stock body load, its characterized in that includes: the upper joint (1), the lower joint (2), the connecting shaft (3), the supporting sleeve (4) and the elastic bearing rod (5), the upper end of the upper joint (1) and the lower end of the lower joint (2) are respectively provided with a threaded connection structure, the lower end of the upper joint (1) and the upper end of the lower joint (2) are used for mutually hinging and connecting the connecting shaft (3), the supporting sleeve (4) is fixedly sleeved on the connecting shaft (3) to limit and position the connecting structure between the connecting shaft (3) and the upper joint (1) and the lower joint (2), the outer circumferential surface of the supporting sleeve (4) is provided with an arc-shaped guide groove, the elastic bearing rod (5) is an elastic structure rod body, the two ends of the elastic bearing rod are respectively limited and fixed on the upper joint (1) and the lower joint (2), the middle part of the elastic bearing rod is in a two-dimensional curve rotary shape on the cross section vertical to the connecting shaft (3), and penetrates through the guide groove arranged on the outer circumferential surface of the support sleeve (4).
2. The flexible sub of claim 1, further comprising: wire plug (6) and wire socket (7), simultaneously, the elastic structure body of rod of elastic bearing pole (5) for seting up central hole, install wire plug (6) in top connection (1), install wire socket (7) in lower clutch (2), wire plug (6) with connecting wire between wire socket (7) is followed pass in the central hole of elastic bearing pole (5).
3. The flexible short section bearing force by the axial elastic long rod body as claimed in claim 2, characterized in that: the two-dimensional curve revolution shape in the middle of the elastic bearing rod (5) is an arc revolution shape, and the arc top of each arc abuts against the inner side wall of the upper joint (1) and the inner side wall of the lower joint (2) respectively.
4. A flexible short section bearing force by an axially elastic long rod body as claimed in any one of claims 1 to 3, wherein: a gap distance delta r is preset between the elastic bearing rod (5) and the guide groove arranged on the outer circumferential surface of the support sleeve (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110165138.7A CN112664149A (en) | 2021-02-07 | 2021-02-07 | Flexible short section with axial elastic long rod bearing force |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110165138.7A CN112664149A (en) | 2021-02-07 | 2021-02-07 | Flexible short section with axial elastic long rod bearing force |
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| Publication Number | Publication Date |
|---|---|
| CN112664149A true CN112664149A (en) | 2021-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110165138.7A Pending CN112664149A (en) | 2021-02-07 | 2021-02-07 | Flexible short section with axial elastic long rod bearing force |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114991684A (en) * | 2022-07-19 | 2022-09-02 | 四川中安嘉盛石油科技有限公司 | Flexible nipple for rotary steering drilling and mounting method thereof |
-
2021
- 2021-02-07 CN CN202110165138.7A patent/CN112664149A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114991684A (en) * | 2022-07-19 | 2022-09-02 | 四川中安嘉盛石油科技有限公司 | Flexible nipple for rotary steering drilling and mounting method thereof |
| CN114991684B (en) * | 2022-07-19 | 2022-10-25 | 四川中安嘉盛石油科技有限公司 | Flexible nipple for rotary steering drilling and mounting method thereof |
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