CN218759769U - Automatic elasticity formula calliper and tube drawing device - Google Patents

Abstract

The application provides an automatic elastic caliper and a tube drawing device, which comprises a caliper body, wherein two rotating pins are arranged in the caliper body, the two rotating pins are respectively connected with a clamping seat through rotating support arms, and the clamping seat is used for being configured on a tool to be drawn; the rotating support arm can rotate relative to the rotating pins, so that a self-locking angle is formed between a contact surface of the clamping seat and the tool to be pulled and a plane formed by central axes of the two rotating pins, and the tool to be pulled is clamped. The caliper can automatically and quickly lock and loosen the casing in the well without manual knocking and smashing, effectively shortens the pulling time, reduces the labor intensity and improves the drilling efficiency.

Description

Automatic elasticity formula calliper and tube drawing device

Technical Field

The application relates to the technical field of oil and seismic drilling, in particular to an automatic elastic caliper and a pipe drawing device.

Background

The pipe-following drilling is a special drilling method, that is, a method of pressing or rotating a casing while drilling, or pressing or rotating a casing in advance, and then drilling with a drilling tool. The method can prevent the collapse of the hole wall or the filling of the flowing sand in the drilling process, and is mainly used for broken stratums which are difficult to form the hole, such as gravel layers, flowing sand layers, covering layers, slope layers and other stratums; the sleeve can also be recycled after drilling is finished, and the sleeve can be reused. The drilling mode is widely applied to multiple fields such as geological exploration, pipeline construction, petroleum geophysical prospecting and drilling by virtue of the advantages of high drilling speed, low cost, high efficiency and the like.

In the fields of geological drilling, resource exploitation and the like, the pipe-following drilling system is used more and more frequently for a recovered pipe-following pipe extractor after casing drilling. In practical use, however, the casing extractor has a great disadvantage when using the casing extractor. The pipe following pipe extractor usually adopts two semi-conical wedge type casing calipers, the two casing calipers are firstly wedged into a wedge seat of the pipe extractor by a hammer in the pipe extracting process, so that the inner diameter of the wedge seat is tightly combined with the outer wall of a casing, and when the casing is lifted, on one hand, the wedge seat and the casing slip to cause the failure of pipe extraction; on the other hand, after a section of casing is pulled out, the wedge seat and the casing cannot be automatically separated, the casing can be lifted to a certain height along with the casing when the pipe drawer is recovered, and the wedge seat of the pipe drawer needs to be knocked and smashed again by the hammer, so that the casing calipers and the casing can be separated. Therefore, the traditional casing following tube extractor is adopted to recover the casing, so that the labor intensity of workers is high, the working time is long, the casing recovery efficiency is low, and certain operation risks exist.

Disclosure of Invention

In view of the above problems, the first aspect of the present invention provides an automatic elastic caliper, which can automatically and rapidly lock and loosen a casing pipe in a well without manual knocking, effectively shorten the pulling time, reduce the labor intensity, and improve the drilling efficiency.

The technical scheme of the invention is as follows: an automatic elastic caliper comprises a caliper body, wherein two rotating pins are arranged in the caliper body, the two rotating pins are respectively connected with a clamping seat through rotating support arms, and the clamping seat is used for being configured on a tool to be pulled; wherein the content of the first and second substances,

the rotating support arm can rotate relative to the rotating pins, so that a self-locking angle is formed between a contact surface of the clamping seat and the tool to be pulled and a plane formed by central axes of the two rotating pins, and the tool to be pulled is clamped.

As one preferable scheme, a clamping ring is detachably connected to the inner side of the clamping seat, and the clamping ring extends out of the inner side surface of the clamping seat to be in contact with the tool to be pulled.

As one preferable scheme, an adjusting pad is arranged on one surface of the clamping ring, which is in contact with the clamping seat.

As one preferable scheme, the caliper further comprises at least one adjusting and fixing screw, and each adjusting and fixing screw penetrates through the clamping seat and is connected with the clamping ring.

As a preferable scheme, an opening is formed at one end part of the rotating arm connected with the cassette, and the opening is used for exposing the part of the adjusting and fixing screw located at the outer side of the cassette.

As one of the preferable schemes, the clamping seat is composed of two symmetrical clamping seat bodies, and the two clamping seat bodies are respectively connected with the corresponding rotating pins through the rotating support arms;

and the two clamping seat bodies are provided with clamping rings.

As one of the preferable schemes, two ends of the two clamping seat bodies are detachably connected through a limiting mechanism respectively.

As one of preferable schemes, the limiting mechanism includes a limiting piece and a limiting pin, the limiting piece is provided with a limiting groove, one end of the limiting piece is fixed on one of the chuck bodies, the other end extends towards the other chuck body, and the limiting pin passes through the limiting groove and is fixed on the other chuck body.

As a preferable scheme, two rotating arms are provided with arm handles.

The invention also provides a tube drawing device which comprises a tube drawing device base and a hydraulic cylinder arranged on the tube drawing device base, wherein the output end of the hydraulic cylinder is connected with the automatic elastic calipers.

Compared with the prior art, the method has the following advantages:

the invention provides an automatic elastic caliper, which comprises a caliper body, wherein two rotating pins are arranged in the caliper body, the two rotating pins are respectively connected with a clamping seat through rotating support arms, and the clamping seat is used for being configured on a tool to be pulled; the rotating support arm can rotate relative to the rotating pins, so that a self-locking angle is formed between the contact surface of the clamping seat and the tool to be pulled and a plane formed by the central axes of the two rotating pins, and the tool to be pulled is clamped.

By adopting the technical scheme, the tool to be pulled is clamped in the clamping seat, on one hand, when the tool to be pulled is lifted when the caliper body is moved, the rotating support arm on the caliper body rotates towards the direction opposite to the lifting direction relative to the central axes of the two rotating pins to drive the clamping seat to move relative to the tool to be pulled, and when the caliper body is moved to a specific position, resistance is formed between the clamping seat and the tool to be pulled to stop rotating the rotating support arm, so that the three parts of the tool to be pulled, the rotating support arm and the caliper body are relatively static to form interlocking, and at the moment, a self-locking angle is formed between the contact surface of the clamping seat and the tool to be pulled and a plane formed by the central axes of the two rotating pins, so that the tool to be pulled is firmly clamped, the tool to be pulled and the caliper are not slipped, and the pulling efficiency is improved; on the other hand, when the tool to be pulled is lifted to a certain height and the caliper body is separated, the caliper body is only required to move towards the direction opposite to the lifting direction, the rotating support arm on the caliper body can rotate towards the same direction of the lifting direction relative to the central axis of the two rotating pins, and once the self-locking angle is changed, the self-locking force between the clamping seat and the tool to be pulled disappears, so that the tool to be pulled is loosened.

Therefore, when the tool to be pulled out is pulled out, the caliper automatically and quickly clamps and separates with the tool to be pulled out. The tool to be pulled out is applicable to various types of tools, such as a sleeve after drilling, a drill rod in a stratum, common tools in life and the like, has wide application scenes, and can effectively reduce the pulling difficulty.

Especially to the recovery of the big instrument of quality such as sleeve pipe in the oil geology probing, solved current sleeve pipe calliper chucking or need use the hammer to strike vigorously when unclamping the sleeve pipe and pound and can with sleeve pipe chucking or separation, the problem that wastes time and energy has reduced staff's intensity of labour and has shortened the working time, has improved tube drawing efficiency to the safety risk that the hammer was pounded and is brought has been avoided pounding.

Drawings

In order to more clearly illustrate the technical solutions of the present application, the drawings needed to be used in the description of the present application will be briefly introduced below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.

FIG. 1 is a schematic view of the overall structure of an automatic tightening caliper according to an embodiment of the present application;

FIG. 2 is a top view of an automatic slack caliper according to an embodiment of the present application;

FIG. 3 is an assembly view of a tube drawing device and a tool to be drawn according to yet another embodiment of the present application.

Description of reference numerals:

1. a caliper body; 2. a rotation pin; 3. rotating the support arm; 4. a snap ring; 5. a card holder; 51. a first chuck body; 52. a second chuck body; 6. adjusting the fixing screw; 7. a limiting sheet; 8. a limit pin; 9. a tube extractor base; 10. a hydraulic cylinder; 11. a pipe puller top seat; 12. an auxiliary sleeve; 13. a well casing.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In view of the problems in the background art, the present invention aims to provide a novel drill-pull caliper to replace the original casing caliper, so as to solve the disadvantages of the casing caliper in the clamping and loosening processes, and meet the requirements of practical drilling use. In addition, the novel drilling and pulling caliper realizes the automatic tightness function, can be matched with various tools to be pulled, and expands the application scene to serve the needs of daily life. The tool to be pulled out can be understood as a tool which needs to be placed on a corresponding carrier according to a specified position in the using process and needs to be recycled after use, or a tool which deviates from the specified position and needs to be reset when the tool is placed in the using process.

To illustrate the present invention more clearly, the following is an example of a casing for casing drilling with a tool to be pulled out.

Referring to fig. 1 and 2, fig. 1 is a schematic view showing an overall structure of an automatic tightening caliper according to the present invention; fig. 2 is a top view of the automatic slack caliper shown in the present invention.

The invention mainly aims to solve the problems that the prior casing caliper needs manpower to repeatedly knock and smash in the process of clamping and separating the casing 13 in a well, and the pulling efficiency of the casing 13 in the well is low, as shown in figures 1-2, the invention provides an automatic elastic caliper, which comprises a caliper body 1, wherein two rotating pins 2 are arranged in the caliper body 1, the two rotating pins 2 are respectively connected with a clamping seat 5 through rotating support arms 3, and the clamping seat 5 is used for being configured on a tool to be pulled; the rotating arm 3 can rotate relative to the rotating pins 2, so that a self-locking angle is formed between the contact surfaces of the clamping seat 5 and the tool to be pulled and a plane formed by the central axes of the two rotating pins 2, and the tool to be pulled is clamped.

Specifically, the caliper body 1 is a square frame made of square steel with the side facing the human body as the front, and the opening penetrates the upper and lower sides, and for example, the square steel with the length of 580mm, the width of 210mm, and the national standard of 50 × 100 is used. Two pin holes are respectively formed in the front side and the rear side of the square frame, the two pin holes in the two opposite sides are opposite, and the two rotating pins 2 are inserted into the two pin holes in the front side and the rear side one by one to form a fixed mode which is mutually parallel and symmetrical in the frame, for example, the shaft diameter of the rotating pins 2 is 30mm, and the center distance is 500mm. Wherein one end of the rotary support arm 3 is hinged with the rotating pin 2, the other end is welded on the clamping seat 5, specifically, the rotary support arm is made of square steel with the length of 200mm and the national standard of 50 x 100, and the width of the rotary support arm 3 is less than the length of the rotating pin 2. Wherein cassette 5 has the through-hole, can inlay in the well interior sleeve pipe 13 in the through-hole or with auxiliary sleeve 12, auxiliary sleeve 12 is used for connecting well interior sleeve pipe 13 and makes well interior sleeve pipe 13 and cassette 5 cooperation, in this embodiment, cassette 5 and the size of the shape looks adaptation of treating to pull out the instrument to the joint treats to pull out the instrument, when treating to pull out the instrument for well interior sleeve pipe 13, cassette 5 is the inside hollow cylindrical cassette 5 of upper and lower opening.

In this embodiment, two rotation pins 2 are installed in the base, two rotation arms 3 and the clamping seat 5 are matched with each other, and the tightness of the caliper on the well casing 13 and the auxiliary casing 12 can be realized through the rotation of the two rotation arms 3. The working principle of the embodiment is as follows:

the well casing 13 is embedded in the clamping seat 5 through the auxiliary casing 12, and the clamping seat 5 is mutually contacted with the outer wall of the auxiliary casing 12 under the action of self weight; when the sleeve 13 in the well is pulled out from the well, the base moves upwards along the axial direction of the sleeve under the action of driving force, the rotary support arm 3 on the base rotates downwards along the plane of the base by taking the rotary shaft as the center, and at the moment, the inner wall of the clamping seat 5 and the outer wall of the sleeve form resistance mutually to prevent the rotary support arm 3 from further rotating, so that the sleeve 13 in the well, the rotary support arm 3 and the base are relatively static to form interlocking; at this moment, the included angle formed between the contact surface of the inner wall of the clamping seat 5 and the outer wall of the sleeve and the plane formed by the central lines of the two rotating pins 2 is a self-locking angle, the angle can form interlocking at certain time, the sleeve can be firmly clamped, the clamping seat 5 and the sleeve cannot slip, the base continues to move upwards under the action of driving force, the sleeve is driven to move upwards, and the sleeve is pulled out of the well through the calipers, so that the purpose of lifting the sleeve is achieved. Wherein the locking force is larger when the self-locking angle is stressed.

When the base moves upwards to the upper stop point, the driving force acts downwards, the base moves downwards, the rotating support arm 3 rotates upwards along the plane of the base by taking the rotating shaft as the center, the self-locking force between the inner wall of the clamping seat 5 and the outer wall of the sleeve disappears due to movement, the inner wall of the clamping seat 5 is separated from the outer wall of the sleeve, and the clamping seat 5 can descend together with the base under the driving of the rotating support arm 3 and reset to the initial position;

when the driving force acts upwards again, the clamping seat 5 and the sleeve form a self-locking lifting sleeve, and a working cycle of sleeve lifting is established.

So, solved current sleeve pipe calliper chucking or when loosening the sleeve pipe need use the hammer to strike vigorously and pound could with sleeve pipe chucking or separation, problem that wastes time and energy has reduced staff's intensity of labour and has shortened the working time, improved tube drawing efficiency to avoided the hammer to strike the safety risk of pounding and bringing.

Referring to fig. 3, fig. 3 is an assembly view of the tube drawing device and the tool to be drawn according to the present invention. As a specific explanation of this embodiment, a driving device is usually provided as fig. 3, because the power required to pull out the cannula against the downward pressure of the cannula and the force of gravity is large. The driving device transmits the driving force to the caliper body 1 to drive the caliper body 1 to reciprocate up and down. Specifically, drive arrangement includes tube drawing ware base 9, has run through the through-hole on tube drawing ware base 9, and the through-hole coincides mutually with the axis of the centre bore of the cassette 5 of calliper, and tube drawing ware base 9 is fixed at the well head, makes the well interior sleeve pipe 13 expose the through-hole that 20CM left and right sides part passed tube drawing ware base 9, is provided with two symmetrical pneumatic cylinders 10 on tube drawing ware base 9, and the telescopic link of pneumatic cylinder 10 is connected on calliper body 1 to transmit drive power for calliper body 1.

In the embodiment, the driving device is driven by the hydraulic cylinder 10, the hydraulic cylinder 10 can convert hydraulic energy into mechanical energy, and the hydraulic system has large power output and stable and reliable performance. Wherein, can drive the clamp body up-and-down motion when the telescopic link contracts from top to bottom. Alternatively, other power transmission means may be used to pull other lighter weight tools. For example, an electric telescopic rod is adopted to drive the hoop body to move, or the hoop body is directly and manually moved.

It will be appreciated that since the length of the portion of the bottom exposed surface of the well casing 13 is generally less than the length of the hydraulic cylinder 10, the well casing 13 cannot pass through the caliper housing 5, and an auxiliary casing 12 is provided to pass through the housing 5 to engage with the ground exposed well casing 13 at the lower end of the housing 5.

As a further explanation of this embodiment, the existing tube drawing device can be directly used, the caliper of this application is placed on the tube drawing device top seat 10, and the sleeve sequentially passes through the through hole of the caliper clamping seat 5, the through hole of the tube drawing device top seat 10 and the through hole of the tube drawing device base 9, so that the sleeve can be directly transported to the field for assembling with the tube drawing device, and the flexibility is high.

In a further improved scheme of this embodiment, a clamping ring 4 is detachably connected to the inner side of the clamping seat 5, and the clamping ring 4 extends out of the inner side surface of the clamping seat 5 to contact with the tool to be pulled. In this scheme designer is at actual oil drilling use, and the discovery is when extracting well casing 13, and the cassette 5 easy wearing and tearing with the contact of sleeve pipe outer wall, and when cassette 5 wearing and tearing back, the error can appear in the auto-lock angle that forms, leads to the auto-lock power to descend. Through set up snap ring 4 in cassette 5, wherein snap ring 4 encircles the setting along the global of cassette 5. The snap ring 4 is brought into contact with the well casing 13 instead of the cartridge 5.

When the telescopic rod of the hydraulic cylinder 10 extends, the clamping ring 4 replaces the clamping seat 5 to form resistance with the outer wall of the casing 13 in the well, the rotating support arm 3 is prevented from rotating, and the casing, the clamping ring 4, the rotating support arm 3 and the base are relatively static to form interlocking; in the embodiment, an included angle formed between the contact surface of the inner wall of the clamping ring 4 and the outer wall of the sleeve and the plane formed by the central lines of the two pin shafts of the base forms a self-locking angle, so that the sleeve 13 in the well is clamped tightly; when the telescopic rod of hydraulic cylinder 10 contracts, drive calliper body 1 and descend, rotatory support arm 3 upwards rotates, and at this moment the inner wall of snap ring 4 disappears with sheathed tube outer wall self-locking power because of removing, and the inner wall of snap ring 4 separates with sheathed tube outer wall.

So, through setting up snap ring 4, after using a period, snap ring 4 after the removable wearing and tearing guarantees calliper from the locking power, improves calliper life. For example, the clamping seat 5 may be processed into a pipe sleeve with an inner diameter of 118mm, an outer diameter of 180mm and a height of 100mm, the clamping ring 4 may be processed into an iron ring with an inner diameter of 108mm, an outer diameter of 150mm and a height of 25mm, a clamping ring groove with a diameter of 150mm and a height of 25mm may be axially processed at a position 20mm at the lower end of the clamping seat 5, and the clamping ring 4 may be clamped in the clamping ring groove, so as to achieve assembly of the clamping ring 4 and the clamping seat 5.

In a further realizable solution, an adjusting pad is arranged on the surface of the clamping ring 4, which is in contact with the clamping seat 5. The back of the clamping ring 4 is additionally provided with the adjusting pad, the distance and the self-locking angle of the clamping ring 4 can be adjusted according to the diameter of the sleeve 13 in the well, and when the clamping ring 4 is self-locked, the upper end face and the lower end face of the opening of the clamping seat 5 are basically equal, so that the self-locking effect is ensured.

In another realizable solution, the caliper further comprises at least one adjusting fixing screw 6, and each adjusting fixing screw 6 penetrates through the clamping seat 5 to be connected with the clamping ring 4. The clamping ring 4 can be fixed on the clamping seat 5 by adjusting the fixing screw 6, so that the clamping ring 4 is prevented from being separated. In the scheme of arranging the adjusting pad, the adjusting fixing screw 6 penetrates through the clamping seat 5 and the adjusting pad to be fixed on the clamping ring 4. Preferably, two adjusting fixing screws 6 are respectively disposed at the central positions of the left and right sides of the card holder 5.

When the clamping ring 4 needs to be replaced, the clamping ring 4 can be taken down from the clamping seat 5 by detaching the adjusting fixing screw 6.

In order to further facilitate the replacement of the snap ring 4 by the worker, an end portion of the rotary arm 3 connected to the clamp seat 5 is opened, and the opening is used for exposing a portion of the adjusting and fixing screw 6 located outside the clamp seat 5. In this embodiment, the end of the rotary arm 3 welded to the clamping seat 5 is arc-shaped, the arc-shaped end is recessed towards the clamping seat 5 to form an opening, the head of the adjusting fixing screw 6 is exposed, and the adjusting fixing screw 6 can be directly detached through the opening by a worker to fix the snap ring 4 or detach the snap ring 4.

In another embodiment, in order to more conveniently replace the snap ring 4, the adjusting pad or the auxiliary sleeve 12, the clamping seat 5 of the caliper of the present application is composed of two symmetrical clamping seat bodies, and the two clamping seat bodies are respectively connected with the corresponding rotating pins 2 through the rotating arms 3; and the two clamping seat bodies are provided with clamping rings 4.

Specifically, the cartridge 5 is composed of two cartridge bodies, which form a space into which the auxiliary sleeve 12 is inserted, dividing the caliper into two parts symmetrical to each other, and specifically, the two cartridge bodies are combined at a distance of 10mm. For example, the pipe sleeve is axially cut, the pipe sleeve is symmetrically cut by 10mm respectively, the pipe sleeve is cut into two semicircular clamping seat bodies, the two semicircular clamping ring grooves are cut similarly, correspondingly, the clamping rings 4 are symmetrically cut at two ends of the center of the circle, the clamping rings are cut by 10mm respectively, the two semicircular clamping rings 4 are cut, and the semicircular clamping rings 4 are embedded in the semicircular clamping seat bodies through the semicircular clamping ring 4 grooves. When 4 intervals of snap ring are adjusted to the quantity that need change snap ring 4 or increase and decrease adjustment pad, can directly open two block seats, it is right to realize the utility model discloses a performance optimization.

As a specific explanation of the embodiment, the welding between the cartridge 5 and the rotary arm 3 is performed by using a plane formed by the center lines of the two rotation pins 2 of the base as a reference, ensuring that the lower end surface of the clamp ring 4 is 1mm higher than the plane on the premise that the inner diameter of the clamp ring 4 is 108mm, aligning the center of the end surface of the rotary arm 3 with the center of the back surface of the semicircular clamp ring 4, and welding the cartridge 5 and the rotary arm 3. The included angle formed between any point of the central line segment of the inner wall of the semicircular snap ring 4 and the plane formed by the central lines of the two rotating shafts of the base is not larger than the self-locking angle of the steel inclined plane by taking the central line of the rotating pin 2 as the vertex.

Optionally, arm handles are provided on both of the rotary arms 3. When two block bases can be dismantled, through setting up the support arm handle, make things convenient for the staff to pull the block base and carry out the change of spare part to suitable position.

Further, under the condition that two clamping seat bodies can be detachably connected, when the sleeve 13 is arranged in the lifting well, the two clamping seat bodies can move synchronously and are not dislocated, and the two ends of the clamping seat bodies are detachably connected through the limiting mechanisms respectively. Furthermore, the limiting mechanism comprises a limiting sheet 7 and a limiting pin 8, the limiting sheet 7 is provided with a limiting groove, one end of the limiting sheet 7 is fixed on one of the clamping seat bodies, the other end of the limiting sheet extends towards the other clamping seat body, and the limiting pin 8 penetrates through the limiting groove and is fixed on the other clamping seat body.

Specifically, the two card holders are described by taking the first card holder body 51 and the second card holder body 52 as an example. Spacing groove is seted up to spacing piece 7, both sides around the opening of spacing groove orientation, the body one end welding of spacing piece 7 is in the extreme position department of left first card pedestal 51, the other end transversely extends to the second card pedestal 52 top on right side, and the orthographic projection of spacing groove covers the partial or whole orthographic projection of second card pedestal 52, extreme position department on second card pedestal 52 sets up puts spacer pin 8, make spacer pin 8 pass the spacing groove, and can slide in the spacing inslot.

In specific implementation, when the sleeve is lifted, the snap rings 4 in the first snap seat body 51 and the second snap seat body 52 are interlocked with the sleeve at the same time, when the hydraulic cylinder 10 is retracted, the self-locking force disappears, and the positions of the first snap seat body 51 and the second snap seat body 52 are dislocated with each other along with the downward movement process of the caliper body 1. Through spacing piece 7 and spacer pin 8 of mutually supporting for the staggered distance between first cassette body 51 and the second cassette body 52 is in the length range of spacing groove, in order to ensure both synchronous motion, when first cassette body 51 and second cassette body 52 descend pneumatic cylinder 10 initial position, first cassette body 51 and second cassette body 52 enclose and close and form cylindrical cassette 5, spacing piece 7 and spacer pin 8 all are on same water flat line this moment, in order to prepare next promotion.

Preferably, the stopper piece 7 and the stopper pin 8 are disposed at two end positions of the first and second chuck bodies 51 and 52. The limiting piece 7 is a slotted iron sheet with the thickness of 8mm, the limiting pin 8 is provided with a screw thread, the limiting pins 8 at two ends of the clamping seat body are disassembled, the first clamping seat body 51, the second clamping seat body 52 and the two rotary support arms 3 can be separated in a rotating mode along the center of the rotating pin 2, and after separation, the clamping rings 4 can be replaced or the number of adjusting pads can be increased or decreased to adjust the distance between the clamping rings 4.

Another aspect of the present invention is to provide a tube drawing device, which includes a tube drawing device base 9 and a hydraulic cylinder 10 disposed on the tube drawing device base 9, wherein an output end of the hydraulic cylinder 10 is connected to the automatic elastic clamp as described above.

The working principle of the tube drawing device in the embodiment of the invention can be realized by referring to the section of the embodiment of the caliper.

To sum up, this application can realize following the pipe well drilling and bore a drilling to the specified well depth after, propose all drilling rods, place the well head with the tube puller earlier, put the upper end of tube puller footstock 10 with automatic elasticity formula calliper again, the lifting arm handle is opened cassette 5, an auxiliary casing 12 and well head bushing of packing into, release the handle, snap ring 4 and well head bushing contact, start-up rig utilizes rig hydraulic system control tube puller pneumatic cylinder 10 to rise, calliper just can automatic locking sleeve pipe extraction well casing 13, hydraulic cylinder 10 when the tube puller rises to the top dead center, derrick hydraulic system control tube puller pneumatic cylinder 10 descends, calliper will loosen the sleeve pipe automatically and fall until pneumatic cylinder 10 gets back to the bottom dead center along with pneumatic cylinder 10, sleeve pipe calliper has just accomplished a duty cycle.

The pipe extractor provided by the invention can automatically extract the casing without manual knocking and smashing, effectively shortens the extraction time, reduces the labor intensity of staff and improves the drilling efficiency. The effect is obvious in the actual operation process, the tube drawing efficiency is improved by 3-5 times compared with that of the original clamp, and powerful technical support is provided for efficient field collection.

It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.

It should also be noted that, in this document, the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Moreover, relational terms such as "first" and "second" are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions or should not be construed as indicating or implying relative importance. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal.

The present application provides an automatic tightening caliper and tube drawing device, which is described in detail above, and the principles and embodiments of the present application are explained herein using specific examples, and the descriptions of the above examples are only used to help understanding the present application, and the content of the present description should not be construed as limiting the present application. While various modifications of the illustrative embodiments and applications will be apparent to those skilled in the art based upon this disclosure, it is not necessary or necessary to exhaustively enumerate all embodiments, and all obvious variations and modifications can be resorted to, falling within the scope of the disclosure.

Claims (10)

1. The automatic elastic caliper is characterized by comprising a caliper body, wherein two rotating pins are arranged in the caliper body, the two rotating pins are respectively connected with a clamping seat through rotating support arms, and the clamping seat is used for being configured on a tool to be pulled; wherein, the first and the second end of the pipe are connected with each other,

the rotating support arm can rotate relative to the rotating pins, so that a self-locking angle is formed between a contact surface of the clamping seat and the tool to be pulled and a plane formed by central axes of the two rotating pins, and the tool to be pulled is clamped.

2. The automatic tightening caliper according to claim 1, wherein a snap ring is detachably connected to the inner side of the clamping seat, and the snap ring extends out of the inner side surface of the clamping seat to contact with the tool to be pulled.

3. The automatic take-up caliper of claim 2, wherein the surface of the snap ring that contacts the clamp seat is provided with an adjustment pad.

4. The automatic tightening caliper according to claim 2 or 3, wherein the caliper further comprises at least one adjusting and fixing screw, and each adjusting and fixing screw penetrates through the clamping seat and is connected with the clamping ring.

5. The automatic take-up caliper of claim 4, wherein an end portion of the rotary arm connected to the cartridge is open to expose a portion of the adjustment set screw located outside the cartridge.

6. An automatic tightening caliper according to any one of claims 1-3, wherein the clamping seat is composed of two symmetrical clamping seat bodies, and the two clamping seat bodies are respectively connected with the corresponding rotating pins through the rotating arms;

and the two clamping seat bodies are respectively provided with a clamping ring.

7. The automatic tightening caliper according to claim 6, wherein the two ends of the two clamping bodies are detachably connected by a limiting mechanism.

8. The automatic tightening clamp according to claim 7, wherein the limiting mechanism comprises a limiting plate and a limiting pin, the limiting plate is provided with a limiting groove, one end of the limiting plate is fixed on one of the clamping bodies, the other end of the limiting plate extends towards the other clamping body, and the limiting pin passes through the limiting groove and is fixed on the other clamping body.

9. The automatic take-up caliper of claim 6, wherein arm handles are provided on both of said rotary arms.

10. A pipe extractor comprising a pipe extractor base and a hydraulic cylinder arranged on said pipe extractor base, wherein the output of said hydraulic cylinder is connected to an automatic slack-and-tightness calliper according to any of claims 1-9.

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