CN214196298U - Sidewall contact device capable of lowering well logging - Google Patents

Abstract

The application relates to a sidewall contact device capable of lowering a logging, which relates to the field of logging equipment and comprises a main rod piece and a plurality of acquisition modules arranged around the circumference of the main rod piece, wherein one end of each acquisition module is hinged with a main arm, and the other end of each acquisition module is hinged with an auxiliary arm; one end of the main arm, which is far away from the acquisition module, is hinged with the main rod piece, and the main rod piece is provided with a push-pull device which drives the main arm to rotate around the hinged position of the main arm and the main rod piece; one end of the auxiliary arm, which is far away from the acquisition module, is hinged with a sliding part, the sliding part is connected to the main rod part in a sliding manner along the length direction of the main rod part, and a stability maintaining device is connected to the sliding part and directly or intermittently applies force to the auxiliary arm to rotate around the hinged position of the sliding part in the direction far away from the main rod part; the acquisition module is always between the push-pull device and the slide. The application has the advantages that: the micro-resistivity scanning imaging logging instrument provided with the sidewall contact device can perform logging once in the lowering process and can perform logging once again in the lifting process, and the logging efficiency is effectively improved.

Description

Sidewall contact device capable of lowering well logging

Technical Field

The application relates to the field of logging equipment, in particular to a sidewall contact device capable of lowering a logging device.

Background

With the steady increase of the demand of various countries in the world for petroleum, in order to enhance the exploration capacity under complex conditions and improve the development benefit, the characteristics of various aspects of the oil and gas reservoir need to be known more accurately.

The micro-resistivity scanning imaging logging instrument has the main advantages of providing an image of the change of the resistivity of the stratum near the well wall along with the depth, and has unique advantages in the aspect of detecting complex lithology and fractured oil and gas reservoirs. When the micro-resistivity scanning imaging logging instrument is used for logging, the micro-resistivity scanning imaging logging instrument needs to be placed in a well, then the sidewall contact device is controlled to push the acquisition module against the wall of the well, and then the micro-resistivity scanning imaging logging instrument moves along the wall of the well and acquires formation information through the acquisition module.

In addition, the acquisition module in the microresistivity scanning imaging logging instrument has higher requirement on the temperature of the acquisition module, and when the internal temperature of the acquisition module exceeds a certain value, the error of logging data exceeds an acceptable range. The internal temperature of the acquisition module is influenced by two aspects, namely the influence of heat dissipation of an electronic element of the acquisition module in a working state on the one hand and the influence of external temperature on the other hand.

Most of the push rams on the existing microresistivity scanning imaging logging instrument adopt parallelogram push structures (such as twelve-arm double-push rams for microresistivity scanning imaging logging instruments disclosed in the Chinese patent with the publication number of CN 201857954U), and the well wall is mostly uneven, so that when the microresistivity scanning imaging logging instrument is used for logging, logging can be carried out only in the process of lifting the microresistivity scanning imaging logging instrument, and logging can not be carried out in the process of lowering the microresistivity scanning imaging logging instrument (if logging is carried out in the lowering process, the microresistivity scanning imaging logging instrument is stuck by the raised part of the well wall, and an acquisition module can be damaged in serious cases.

In the related art, the collection module of the micro-resistivity scanning imager contains various electronic elements, which have strict requirements on the temperature of the working environment, and when the working temperature is higher than a certain value, the working precision of the electronic elements is greatly influenced, so that the data detected by the micro-resistivity scanning imager has a large error. Therefore, the electronic components are all sealed inside the collection module, and the housing in the collection module is mostly made of heat insulation material to reduce the influence of the external temperature on the electronic components. However, since the electronic components also generate a certain amount of heat during the operation, the internal temperature of the acquisition module gradually rises, and the heat dissipation performance of the acquisition module is poor, so that the single operation time of the micro-resistivity scanning imager is limited. In the related art, when a microresistivity scanning imager is used for logging, the microresistivity scanning imager needs to be lowered to a preset position, lifted upwards and logged; and in the process of lowering the micro-resistivity scanning imaging logging instrument, the temperature in the acquisition module rises to a certain extent, so that the usable time of the micro-resistivity scanning imaging logging instrument for logging in the well is relatively short, and the logging efficiency is low.

SUMMERY OF THE UTILITY MODEL

In order to improve the logging efficiency, the application provides a sidewall contact device capable of lowering logging.

The sidewall contact device capable of lowering logging adopts the following technical scheme:

a sidewall contact device capable of lowering a well logging comprises a main rod piece and a plurality of acquisition modules arranged around the circumference of the main rod piece, wherein one end of each acquisition module is hinged with a main arm, and the other end of each acquisition module is hinged with an auxiliary arm;

one end of the main arm, which is far away from the acquisition module, is hinged with the main rod piece, and a push-pull device is arranged on the main rod piece and drives the main arm to rotate around the hinged position of the main arm and the main rod piece;

one end of the auxiliary arm, which is far away from the acquisition module, is hinged with a sliding part, the sliding part is connected to the main rod part in a sliding manner along the length direction of the main rod part, and a stability maintaining device is connected to the sliding part and directly or intermittently applies force to the auxiliary arm to rotate around the hinged position of the sliding part in the direction far away from the main rod part;

the acquisition module is always between the push-pull device and the slider.

By adopting the technical scheme, the micro-resistivity scanning imaging logging instrument provided with the sidewall contact device can perform logging once in the lowering process and can perform logging once again in the lifting process, so that the logging efficiency is effectively improved.

Under a normal state, the main arm, the auxiliary arm and the acquisition module are gathered on the main rod piece. When the micro-resistivity scanning imaging logging instrument is used, the main arm is driven to rotate around the hinged position of the main arm and the main rod piece in the direction far away from the main rod piece through the push-pull device, meanwhile, the auxiliary arm can also rotate around the sliding piece in the direction far away from the main rod piece under the action of the stabilizing device until the acquisition module is tightly attached to the well wall, so that a trapezoidal structure is formed among the main arm, the auxiliary arm, the acquisition module and the main rod piece, and therefore the micro-resistivity scanning imaging logging instrument provided with the sidewall contact device can be used for logging in the lowering process and can also be used for logging in the lifting process, and the logging efficiency is effectively improved; moreover, the logging is started in the lowering process, the usable time of the micro-resistivity scanning imaging logging instrument for logging in the well can be effectively prolonged, and the logging efficiency is effectively improved.

Optionally, the push-pull device includes a push-pull disc, a transmission mechanism connected between the push-pull disc and the main arm, and a driving mechanism connected to the main rod member, and the driving mechanism drives the push-pull disc to slide along the length direction of the main rod member.

By adopting the technical scheme, when the device is used, the pushing and pulling disc can be driven by the driving mechanism to slide in the main rod piece, and then the transmission mechanism transmits the motion of the pushing and pulling disc to the main arm and drives the main arm to rotate around the hinged position of the main arm and the main rod piece.

Optionally, a connecting groove is formed in one end of the main arm hinged to the main rod element; and a connecting pin is movably connected in the connecting groove and is fixed at one end of the transmission mechanism far away from the push-pull disc.

By adopting the technical scheme, the connecting structure is simple, and the linear motion of the transmission mechanism on the main rod piece can be converted into the rotation of the main arm around the hinged position of the main arm and the main rod piece.

Optionally, a first installation cavity is formed in the main rod piece, and the push-pull disc is connected in the main rod piece in a sliding manner along the length direction of the main rod piece;

the transmission mechanism comprises a first push-pull rod and a second push-pull rod, wherein the first push-pull rod penetrates through the push-pull disc along the length direction of the main rod piece and is in sliding fit with the push-pull disc;

one end of the first push-pull rod is connected with part of the main arm through the connecting pin, the other end of the first push-pull rod is connected with the anti-drop head, a first push spring is sleeved on the first push-pull rod, one end of the first push spring is connected with the push-pull disc, and the other end of the first push spring is connected with the first push-pull rod;

a second push spring is connected between the second push-pull rod and the push-pull disc, one end of the second push-pull rod is connected with the other part of the main arm through the connecting pin, and the other end of the second push-pull rod is connected with an anti-falling cylinder; the anti-falling cylinder is sleeved outside the push-pull disc in a sliding mode, one end of the anti-falling cylinder is fixedly connected with the second push-pull rod, and the other end of the anti-falling cylinder is connected with an anti-falling ring.

By adopting the technical scheme, when the driving mechanism drives the push-pull disc to move towards the direction close to the acquisition module, the push-pull disc can respectively push the first push-pull rod and the second push-pull rod to move towards the direction of the acquisition module through the first push spring and the second push spring, so that the main arm rotates around the hinged position of the main arm and the main rod piece, and the push-pull device is gradually opened. And when the sidewall contact device moves to uneven positions in the underground, the first pushing spring and the second pushing spring play a certain role in buffering and protecting, so that rigid collision between the acquisition module and the well wall is not easy to occur.

When the driving mechanism drives the push-pull disc to move towards the direction far away from the acquisition module, the push-pull disc can respectively pull the first push-pull rod and the second push-pull rod to move towards the direction far away from the acquisition module through the anti-drop head and the anti-drop ring, so that the main arm rotates around the hinged position of the main rod piece of the main arm, and the push-pull device is gradually folded.

Optionally, the stabilizer comprises a resilient member connected between the secondary arm and the slider.

Through adopting above-mentioned technical scheme, the elastic component can directly be applyed the vice arm and rotate to keeping away from the main pole piece direction around slider articulated department power. Moreover, when the pusher moves to uneven positions in the underground, the elastic piece can play a certain role in buffering and protecting, so that rigid collision between the acquisition module and the well wall is not easy to occur.

Optionally, the elastic member is a spring plate.

Through adopting above-mentioned technical scheme, the spring leaf is as the elastic component, simple structure, and the low price is easily maintained and is maintained.

Optionally, a second mounting cavity is formed in the main rod;

the stability maintaining device comprises a fixed ring fixedly connected in the second mounting cavity, a first dimensional stability rod penetrating through the fixed ring along the length direction of the main rod piece and in sliding fit with the fixed ring, and a second dimensional stability rod sleeved on the first dimensional stability rod in a sliding manner;

one end of the first dimensional stabilizing rod is connected with part of the sliding part, the other end of the first dimensional stabilizing rod is connected with the anti-falling part, a first dimensional stabilizing spring is sleeved on the first dimensional stabilizing rod, one end of the first dimensional stabilizing spring is connected with the fixing ring, and the other end of the first dimensional stabilizing spring is connected with the first dimensional stabilizing rod;

the second dimension stabilizer bar with be connected with the second dimension steady spring between the solid fixed ring, the one end that solid fixed ring was kept away from to second dimension stabilizer bar one end is connected with another part slider.

By adopting the technical scheme, when the sidewall contact device is in a closed state, the first dimensionally stable spring and the second dimensionally stable spring are both in a compressed state. When the pusher is gradually opened, the first dimensionally stable spring and the second dimensionally stable spring push the corresponding sliding part to move towards the direction close to the acquisition module, so that the pusher can be smoothly opened, and the acquisition posture of the acquisition module is maintained. When the sidewall contact device moves to uneven positions in the underground, the first dimensionally stable spring and the second dimensionally stable spring can play a certain buffering and protecting role, and rigid collision between the acquisition module and the well wall is not easy to occur.

Optionally, a balance arm is further hinged between the acquisition module and the sliding part, and the balance arm is always parallel to the auxiliary arm.

By adopting the technical scheme, the rotation of the auxiliary arm is more stable and smooth.

Optionally, at least four acquisition modules are provided.

Optionally, after the push-arm device is opened, under the condition of no external force intervention, a sequential connection line of a hinge point of the main arm and the main rod, a hinge point of the main arm and the acquisition module, a hinge point of the acquisition module and the auxiliary arm, and a hinge point of the auxiliary arm and the sliding member forms an isosceles trapezoid.

By adopting the technical scheme, the sidewall contact device can be suitable for well bodies with different diameters. And after the sidewall contact device is opened, the acquisition module is always in the optimal acquisition posture, so that the formation information acquired by the acquisition module is more accurate.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the micro-resistivity scanning imaging logging instrument provided with the sidewall contact device can perform logging once in the lowering process and can perform logging once again in the lifting process, so that the logging efficiency is effectively improved; moreover, logging is started in the lowering process, so that the service life of the micro-resistivity scanning imaging logging instrument for logging in the well can be effectively prolonged, and the logging efficiency is effectively improved;

2. the push-pull device and the stability maintaining device have certain buffering and protecting functions, so that rigid collision between the acquisition module and the well wall is not easy to occur;

3. the sidewall contact device can be suitable for well bodies with different diameters; after the sidewall contact device is opened, the acquisition module can be tightly attached to the well wall and is in a good acquisition posture, and the stratum information acquired by the acquisition module is more accurate.

Drawings

Fig. 1 is a schematic overall structure diagram of a sidewall contact device in the first embodiment of the present application.

Fig. 2 is a schematic view of a connection structure of the sub-arm, the sliding member and the elastic member according to an embodiment of the present application.

Fig. 3 is a partial cross-sectional view of a sidewall contact device according to a first embodiment of the present application to embody the structure of a push-pull device.

Fig. 4 is an enlarged view at a in fig. 3.

Fig. 5 is an enlarged view at B in fig. 3.

Fig. 6 is a schematic overall structure diagram of the sidewall contact device in the second embodiment of the present application.

Fig. 7 is a partial cross-sectional view of a sidewall contact device in the second embodiment of the present application to embody the structure of the stabilizer.

Fig. 8 is an enlarged view at C in fig. 7.

Description of reference numerals: 1. a main bar member; 11. a first bar member; 12. a second bar member; 13. a third bar member; 14. a main accommodating groove; 15. an auxiliary accommodating groove; 16. a first mounting cavity; 17. a second mounting cavity; 18. a third mounting cavity; 19. a fourth mounting cavity; 2. an acquisition module; 3. a main arm; 31. connecting grooves; 4. an auxiliary arm; 41. a slider; 42. a limiting groove; 51. an elastic member; 52. a fixing ring; 53. a first dimension stabilizer bar; 531. a first connector; 54. a second dimension stabilizer bar; 541. a second connector; 55. a balance arm; 56. a drop-off prevention member; 57. a first dimensionally stable spring; 58. a second backing ring; 59. a third backing ring; 50. a second dimensionally stable spring; 61. a push-pull disc; 62. a transmission mechanism; 621. a first push-pull rod; 622. a second push-pull rod; 623. connecting sheets; 624. a connecting pin; 625. a first push spring; 626. a first backing ring; 627. the head is prevented from falling off; 628. a second push spring; 629. an anti-drop cylinder; 620. the anti-drop ring; 63. a drive mechanism; 631. a motor; 632. a screw rod; 633. a nut; 634. a connecting member.

Detailed Description

The present application is described in further detail below with reference to figures 1-8.

The embodiment of the application discloses a sidewall contact device capable of conducting down-hole logging.

The first embodiment is as follows:

with reference to fig. 1, the sidewall contact device comprises a main rod 1 and several acquisition modules 2. The main rod 1 comprises a first rod 11 and a second rod 12, the first rod 11 and the second rod 12 are coaxial and are connected by a screw sleeve. The number of the acquisition modules 2 is four in the present embodiment, the four acquisition modules 2 are circumferentially arranged around the second rod 12, and the acquisition modules 2 are staggered in the axial direction of the second rod 12.

The end of each acquisition module 2 far away from the first rod piece 11 is hinged with a secondary arm 4, and the end of the secondary arm 4 far away from the acquisition module 2 is hinged with a sliding piece 41 through a pin shaft. A plurality of auxiliary accommodating grooves 15 for accommodating the auxiliary arms 4 are formed on the peripheral side wall of the second rod 12 away from the first rod 11, and the sliding member 41 is connected in the auxiliary accommodating grooves 15 in a sliding manner along the length direction of the second rod 12.

Referring to fig. 1 and 2, the pusher further comprises a stabilizer comprising an elastic member 51 connected between the sub-arm 4 and the slider 41, in this embodiment the elastic member 51 is an arc-shaped spring plate. A limiting groove 42 is formed in one side of the auxiliary arm 4 facing the second rod 12, one end of the spring piece is fixedly connected with the sliding piece 41, and the other end of the spring piece extends into the limiting groove 42 and is abutted against the bottom of the limiting groove 42.

Referring to fig. 1, a main arm 3 is hinged to one end of each acquisition module 2 close to a first rod 11, a plurality of main accommodating grooves 14 for accommodating the main arm 3 are formed in the peripheral side wall of a second rod 12 close to the first rod 11, and one end of the main arm 3, which is far away from the acquisition module 2, extends into the corresponding main accommodating groove 14 and is hinged to the second rod 12 through a pivot. An avoidance space of the avoidance collection module 2 is formed in the middle of the second rod 12, and the avoidance space is communicated with each main accommodation groove 14 and each auxiliary accommodation groove 15. Referring to fig. 3, a third installation cavity 18 is formed at an end of the second pin 12 adjacent to the first pin 11, and the third installation cavity 18 communicates with each of the main receiving grooves 14.

Referring to fig. 3, the first rod 11 is a cylinder, and a first installation cavity 16 is formed inside the first rod, and a push-pull device for driving the main arm 3 to rotate around the pivot is arranged in the first installation cavity 16. The push-pull device comprises a push-pull disc 61, a transmission mechanism 62 connected between the push-pull disc 61 and the main arm 3, and a driving mechanism 63 for driving the push-pull disc 61 to reciprocate along the length direction of the first rod piece 11.

Referring to fig. 3, the driving mechanism 63 includes a motor 631 disposed in the first mounting chamber 16, a screw 632 disposed along the length direction of the first rod 11, and a nut 633 screwed on the screw 632, wherein one end of the screw 632 is fixedly connected to the output shaft of the motor 631, and the nut 633 is slidably connected to the first rod 11 and cannot rotate on the first rod 11. A connecting member 634 is connected between the nut 633 and the push-pull plate 61.

When the motor 631 rotates forward, the motor 631 drives the screw rod 632 to rotate, the screw rod 632 drives the nut 633 to move in the first rod 11 toward the main arm 3, and meanwhile, the nut 633 pushes the push-pull plate 61 to move toward the main arm 3 through the connecting element 634. When the motor 631 rotates reversely, the motor 631 drives the lead screw to rotate, the lead screw 632 drives the nut 633 to move in the first rod 11 in a direction away from the main arm 3, and meanwhile, the nut 633 pulls the push-pull plate 61 through the connecting piece 634 to move in a direction away from the main arm 3.

Referring to fig. 3 and 4, the transmission mechanism 62 includes a first push-pull rod 621 penetrating through the push-pull disc 61 along the length direction of the first rod 11 and slidably engaged with the push-pull disc 61, and a second push-pull rod 622 slidably sleeved outside the first push-pull rod 621, wherein the first push-pull rod 621 and the second push-pull rod 622 both extend into the third installation cavity 18 and are respectively fixed with a connecting piece 623. A connecting groove 31 is arranged at one end of the main arm 3 hinged with the second rod 12, and the connecting groove 31 is positioned between the pivot and the axis of the second rod 12; a connecting pin 624 is movably provided in each connecting groove 31, and the connecting pin 624 is fixed to the corresponding connecting piece 623. When the connecting piece 623 is moved along the length direction of the main rod 1 by the first push-pull rod 621 or the second push-pull rod 622, the connecting pin 624 pushes the main arm 3 to pivot.

Referring to fig. 3 and 5, a first push spring 625 and a first backing ring 626 are sleeved in the middle of the first push-pull rod 621, a shaft shoulder is further processed in the middle of the first push-pull rod, one side of the first backing ring 626 abuts against the shaft shoulder, and the other side abuts against the first push spring 625; one end of the first push spring 625, which is far away from the first backing ring 626, abuts against the push-pull disc 61; an anti-disengaging head 627 is fixedly connected to an end of the first push-pull rod 621 away from the main arm 3, and the anti-disengaging head 627 and the first push spring 625 are respectively located on two sides of the push-pull disc 61.

A second push spring 628 is disposed between the second push-pull rod 622 and the push-pull disc 61, the second push spring 628 is sleeved outside the first push spring 625, and one end of the second push spring 628 abuts against the second push-pull rod 622 and the other end abuts against the push-pull disc 61. An anti-falling cylinder 629 is further sleeved outside the second push spring 628, one end of the anti-falling cylinder 629 is fixedly connected with the second push-pull rod 622, an anti-falling ring 620 is integrally formed at the other end of the anti-falling cylinder 629, the push-pull disc 61 is positioned in the anti-falling cylinder 629, and the anti-falling ring 620 and the second push spring 628 are respectively positioned at two sides of the push-pull disc 61.

The implementation principle of the embodiment is as follows:

when the pushing device needs to be opened, the driving mechanism 63 drives the pushing and pulling disc 61 to move towards the direction close to the collection module 2, the pushing and pulling disc 61 pushes the first pushing and pulling rod 621 and the second pushing and pulling rod 622 to move towards the direction of the collection module 2 through the first pushing spring 625 and the second pushing spring 628, so that the connecting pin 624 pushes the main arm 3 to rotate anticlockwise around the pivot, meanwhile, the sliding member 41 slides towards the direction close to the collection module 2 in the auxiliary accommodating groove 15, and the auxiliary arm 4 rotates anticlockwise around the pin under the action of the elastic member 51, so that the pushing device is gradually opened.

During the opening process of the pusher, the acquisition module 2 is always positioned between the push-pull device and the slider 41; under the condition of no external force intervention, the sequential connecting lines of the hinge point of the main arm 3 and the main rod element 1, the hinge point of the main arm 3 and the acquisition module 2, the hinge point of the acquisition module 2 and the auxiliary arm 4 and the hinge point of the auxiliary arm 4 and the sliding element 41 form an isosceles trapezoid; therefore, the micro-resistivity scanning imaging logging instrument provided with the push ram can be used for logging in the lowering process and the lifting process, and the logging efficiency is effectively improved. Moreover, the logging is started in the lowering process, the usable time of the micro-resistivity scanning imaging logging instrument for logging in the well can be effectively prolonged, and the logging efficiency is effectively improved.

When the sidewall contact device moves in a well body in an opening state, if the sidewall contact device moves to an uneven position, the main arm 3 and/or the auxiliary arm 4 can swing under the action of external force, so that the acquisition posture of the acquisition module 2 is adjusted, and the acquisition module 2 is not easy to rigidly collide with the well wall; the micro-resistivity scanning imaging logging instrument provided with the push rod device can be used for logging in the lowering process and the lifting process, and the push rod device is not easy to block in the logging process.

When the push-pull device needs to be closed, the driving mechanism 63 drives the push-pull disc 61 to move in a direction away from the acquisition module 2, the push-pull disc 61 pulls the first push-pull rod 621 and the second push-pull rod 622 to move in a direction away from the acquisition module 2 through the anti-drop head 627 and the anti-drop barrel 629 respectively, so that the connecting pin 624 pushes the main arm 3 to rotate clockwise around the pivot, meanwhile, the sliding member 41 slides in a direction away from the acquisition module 2 in the auxiliary accommodating groove 15, the auxiliary arm 4 rotates clockwise around the pin shaft and compresses the elastic member 51, and the push-pull device is gradually closed.

Example two:

referring to fig. 6 and 7, one of the differences between the present embodiment and the first embodiment is that: the main rod member 1 further comprises a third rod member 13, the third rod member 13 is detachably fixed at one end of the second rod member 12 far away from the first rod member 11 and is coaxial with the second rod member 12, and a second mounting cavity 17 is formed inside the third rod member 13. A fourth mounting cavity 19 is formed at one end of the second rod member 12 connected with the third rod member 13, and the fourth mounting cavity 19 is communicated with each of the sub receiving grooves 15.

Another difference between the present embodiment and the first embodiment is that: the structure of the stabilizer is different. The stabilizing device in this embodiment includes a fixing ring 52 fixedly connected in the second mounting cavity 17, a first dimension stabilizing rod 53 passing through the fixing ring 52 along the length direction of the third rod 13 and slidably engaged with the fixing ring 52, a second dimension stabilizing rod 54 slidably sleeved on the first dimension stabilizing rod 53, and a balance arm 55 hinged between the acquisition module 2 and the sliding member 41, wherein the balance arm 55 is as long as and parallel to the sub-arm 4 connected to the same sliding member 41. One end of the second dimension stable rod 54 extends into the fourth installation cavity 19 and is fixedly connected with a second connector 541, and the second connector 541 is hinged with the other two sliding parts 41. One end of the first stabilizer bar 53 extends into the fourth installation cavity 19 and is fixedly connected with a first connecting head 531, and the first connecting head 531 is hinged with the two sliding pieces 41.

Referring to fig. 7 and 8, one end of the first dimension stabilizing rod 53, which is far away from the secondary arm 4, is fixedly connected with an anti-drop piece 56, a first dimension stabilizing spring 57 and a second backing ring 58 are sleeved in the middle of the first dimension stabilizing rod 53, and the second backing ring 58 is fixedly connected with the first dimension stabilizing rod 53; the first stabilizer spring 57 has one end abutting against the fixed ring 52 and the other end abutting against the second backing ring 58. The one end fixedly connected with third backing ring 59 that keeps away from fly jib 4 at second dimension steady pole 54 still overlaps outside first dimension steady spring 57 to be equipped with second dimension steady spring 50, and second dimension steady spring 50 one end and solid fixed ring 52 butt, the other end and third backing ring 59 butt.

The implementation principle of the embodiment is as follows:

when the pusher is in the closed state, both the first stabilizing spring 57 and the second stabilizing spring 50 are in a compressed state. When the sidewall contact device needs to be opened, the driving mechanism 63 drives the push-pull disc 61 to move towards the direction close to the acquisition module 2, the push-pull disc 61 pushes the first push-pull rod 621 and the second push-pull rod 622 to move towards the direction of the acquisition module 2 through the first push spring 625 and the second push spring 628, respectively, so that the connecting pin 624 pushes the main arm 3 to rotate anticlockwise around the pivot, and meanwhile, the first stabilizing spring 57 and the second stabilizing spring 50 push the corresponding sliding member 41 to slide towards the direction close to the acquisition module 2 in the auxiliary accommodating groove 15 through the first stabilizing rod 53 and the second stabilizing rod 54, respectively, so that the auxiliary arm 4 rotates anticlockwise around the pin, and the sidewall contact device is gradually opened.

When the push-pull device needs to be folded, the driving mechanism 63 drives the push-pull disc 61 to move in a direction away from the acquisition module 2, the push-pull disc 61 pulls the first push-pull rod 621 and the second push-pull rod 622 to move in a direction away from the acquisition module 2 through the anti-drop head 627 and the anti-drop barrel 629 respectively, so that the connecting pin 624 pushes the main arm 3 to rotate clockwise around the pivot, meanwhile, the sliding piece 41 slides in the auxiliary accommodating groove 15 in a direction away from the acquisition module 2, the auxiliary arm 4 rotates clockwise around the pin, and the push-pull device is gradually folded.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (10)

1. The utility model provides a sidewall contact device of well logging can descend, includes main member (1) and a plurality of collection module (2) that set up around main member (1) circumference, characterized by: one end of the acquisition module (2) is hinged with a main arm (3), and the other end is hinged with an auxiliary arm (4);

one end, far away from the acquisition module (2), of the main arm (3) is hinged to the main rod piece (1), a push-pull device is arranged on the main rod piece (1), and the push-pull device drives the main arm (3) to rotate around the hinged position of the main arm and the main rod piece (1);

one end, far away from the acquisition module (2), of the auxiliary arm (4) is hinged with a sliding part (41), the sliding part (41) is connected to the main rod piece (1) in a sliding mode along the length direction of the main rod piece (1), the sliding part (41) is connected with a stability maintaining device, and the stability maintaining device directly or intermittently applies force to the auxiliary arm (4) to rotate towards the direction far away from the main rod piece (1) around the hinged position of the sliding part (41);

the acquisition module (2) is always between the push-pull and the slide (41).

2. The sidewall contact device for downhole logging of claim 1, wherein: the push-pull device comprises a push-pull disc (61), a transmission mechanism (62) connected between the push-pull disc (61) and the main arm (3) and a driving mechanism (63) connected to the main rod piece (1), wherein the driving mechanism (63) drives the push-pull disc (61) to slide along the length direction of the main rod piece (1).

3. The sidewall contact ram for a downhole logging tool of claim 2, wherein: one end of the main arm (3) hinged with the main rod piece (1) is provided with a connecting groove (31); a connecting pin (624) is movably connected in the connecting groove (31), and the connecting pin (624) is fixed at one end, far away from the push-pull disc (61), of the transmission mechanism (62).

4. The sidewall contact device of claim 3, wherein: a first mounting cavity (16) is formed in the main rod piece (1), and the push-pull disc (61) is connected in the main rod piece (1) in a sliding manner along the length direction of the main rod piece (1);

the transmission mechanism (62) comprises a first push-pull rod (621) penetrating through the push-pull disc (61) along the length direction of the main rod piece (1) and in sliding fit with the push-pull disc (61), and a second push-pull rod (622) sleeved outside the first push-pull rod (621) in a sliding manner;

one end of the first push-pull rod (621) is connected with part of the main arm (3) through the connecting pin (624), the other end of the first push-pull rod is connected with the anti-drop head (627), a first push spring (625) is sleeved on the first push-pull rod (621), one end of the first push spring (625) is connected with the push-pull disc (61), and the other end of the first push spring (625) is connected with the first push-pull rod (621);

a second push spring (628) is connected between the second push-pull rod (622) and the push-pull disc (61), one end of the second push-pull rod (622) is connected with the other part of the main arms (3) through the connecting pin (624), and the other end of the second push-pull rod (622) is connected with an anti-falling barrel (629); the anti-falling cylinder (629) is sleeved outside the push-pull disc (61) in a sliding manner, one end of the anti-falling cylinder is fixedly connected with the second push-pull rod (622), and the other end of the anti-falling cylinder is connected with an anti-falling ring (620).

5. The sidewall contact device for downhole logging of claim 1, wherein: the stabilizer comprises an elastic member (51) connected between the secondary arm (4) and the sliding member (41).

6. The sidewall contact device of claim 5, wherein: the elastic piece (51) is a spring piece.

7. The sidewall contact device for downhole logging of claim 1, wherein: a second mounting cavity (17) is formed in the main rod piece (1);

the stability maintaining device comprises a fixing ring (52) fixedly connected in the second mounting cavity (17), a first dimensional stability rod (53) penetrating through the fixing ring (52) along the length direction of the main rod piece (1) and in sliding fit with the fixing ring (52), and a second dimensional stability rod (54) sleeved on the first dimensional stability rod (53) in a sliding manner;

one end of the first dimension stabilizing rod (53) is connected with a part of the sliding part (41), the other end of the first dimension stabilizing rod (53) is connected with an anti-falling part (56), a first dimension stabilizing spring (57) is sleeved on the first dimension stabilizing rod (53), one end of the first dimension stabilizing spring (57) is connected with the fixed ring (52), and the other end of the first dimension stabilizing spring (57) is connected with the first dimension stabilizing rod (53);

and a second dimension stabilizing spring (50) is connected between the second dimension stabilizing rod (54) and the fixing ring (52), and one end, far away from the fixing ring (52), of one end of the second dimension stabilizing rod (54) is connected with the other part of the sliding part (41).

8. The sidewall contact ram for a downhole logging tool of claim 7, wherein: a balance arm (55) is further hinged between the acquisition module (2) and the sliding piece (41), and the balance arm (55) is always parallel to the auxiliary arm (4).

9. The sidewall contact device for downhole logging of claim 1, wherein: the number of the acquisition modules (2) is at least four.

10. The sidewall contact device for downhole logging of any of claims 1-9, wherein: after the push device is opened, under the condition of no external force intervention, the sequential connecting lines of the hinge point of the main arm (3) and the main rod piece (1), the hinge point of the main arm (3) and the acquisition module (2), the hinge point of the acquisition module (2) and the auxiliary arm (4) and the hinge point of the auxiliary arm (4) and the sliding piece (41) form an isosceles trapezoid.

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