CN112963144A

CN112963144A - Small-diameter micro-resistivity scanning imager

Info

Publication number: CN112963144A
Application number: CN202110142514.0A
Authority: CN
Inventors: 张宝辉; 李东生; 颜肖平; 张学林
Original assignee: CHINA OILFIELD TECHNOLOGY SERVICES
Current assignee: CHINA OILFIELD TECHNOLOGY SERVICES
Priority date: 2021-02-02
Filing date: 2021-02-02
Publication date: 2021-06-15

Abstract

The application relates to a small-diameter micro-resistivity scanning imager, which 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, an installation chamber is arranged in the main rod piece, a push-pull device is arranged in the installation chamber, and a part in the push-pull device extends out of the installation chamber to be connected with the main arm so as to drive 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 applies force to the auxiliary arm to rotate around the hinged position of the auxiliary arm and the sliding part in the direction far away from the main rod part; the acquisition module is positioned between the push-pull device and the sliding part; and the main rod piece is provided with a hydraulic balance device for balancing and installing the pressure of the indoor and outdoor liquid. The advantages are that: the logging device can be used for logging in the lowering process and the lifting process.

Description

Small-diameter micro-resistivity scanning imager

Technical Field

The application relates to the field of logging equipment, in particular to a small-diameter micro-resistivity scanning imager.

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 imager 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 imager is used for logging, the micro-resistivity scanning imager needs to be placed in a well, then the sidewall contact device is controlled to push the acquisition module against the well wall, then the micro-resistivity scanning imager is moved along the well wall, and the acquisition module acquires formation information.

In addition, the acquisition module in the micro-resistivity scanning imager 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 micro-resistivity scanning imager adopt a parallelogram push structure (for example, a twelve-arm double-push ram for the micro-resistivity scanning imager disclosed in the Chinese patent with the publication number of CN 201857954U), and the well wall is mostly uneven, so that when the micro-resistivity scanning imager is used for logging, logging can be performed only in the process of lifting up the micro-resistivity scanning imager, and logging cannot be performed in the process of putting down the micro-resistivity scanning imager (if logging is performed in the process of putting down the micro-resistivity scanning imager, the micro-resistivity scanning imager is stuck by the protruded part of the well wall, and an acquisition module can be damaged by collision in severe 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 imager, the temperature in the acquisition module rises to a certain extent, so that the service time of the micro-resistivity scanning imager for logging in the well is relatively short, and the logging efficiency is low.

Disclosure of Invention

In order to enable the small-diameter micro-resistivity scanning imager to be capable of logging in the process of lowering and lifting, the application provides the small-diameter micro-resistivity scanning imager.

The application provides a little resistivity scanning imager adopts following technical scheme:

a small-diameter micro-resistivity scanning imager 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, an installation chamber is arranged in the main rod piece, a push-pull device is arranged in the installation chamber, and a part in the push-pull device extends out of the installation chamber to be connected with the main arm so as to drive the main arm to rotate around the hinged position of the main arm and the main rod piece;

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

the acquisition module is positioned between the push-pull device and the sliding part;

and the main rod piece is provided with a hydraulic balance device for balancing and installing the pressure of the indoor and outdoor liquid.

Through adopting above-mentioned technical scheme, minor diameter microresistivity scanning imager is under the open mode, and main arm, collection module and fly jib are isosceles trapezoid structure for minor diameter microresistivity scanning imager both can carry out the well logging at the in-process of transferring, can carry out the well logging at the in-process of lifting again, make the well logging more convenient. And, directly carry out the logging in the in-process of transferring, the length of time of single logging is longer, and efficiency is higher.

When in use, the installation chamber is filled with hydraulic oil; when pressure difference exists between the internal pressure of the liquid storage chamber and the external environment pressure, the hydraulic balance device can balance the pressure of the liquid storage chamber and the external environment pressure, so that external liquid and impurities are not prone to stretch out of the installation chamber from the push-pull device and enter the installation chamber, the sealing performance of the installation chamber is effectively improved, and the small-diameter micro-resistivity scanning imager can be normally used under the condition of higher pressure.

Optionally, the stability maintaining device includes a spring plate, and two ends of the spring plate are respectively connected to the sliding member and the auxiliary arm.

Through adopting above-mentioned technical scheme, the spring leaf can directly be applied to the fly jib and rotate to the direction of keeping away from the main member piece around slider articulated department. And when the small-diameter micro-resistivity scanning imager moves to uneven positions underground, the spring piece can play a certain buffering and protecting role, so that rigid collision is not easy to occur between the acquisition module and the well wall.

Optionally, the push-pull device comprises a rotary driving member, a transmission assembly, a push-pull disc and a push-pull rod which are arranged in the installation chamber; the transmission assembly is connected between the rotary driving piece and the push-pull disc and is used for converting the rotary motion output by the rotary driving piece into the linear motion of the push-pull disc; one end of the push-pull rod is connected with the push-pull disc, and the other end of the push-pull rod extends out of the mounting chamber;

the main arm is hinged to one end, hinged to the main rod piece, of the main rod piece, and one end, far away from the main arm, of the connecting piece is hinged to one end, extending out of the mounting chamber, of the push-pull rod.

By adopting the technical scheme, when in use, the transmission assembly can convert the rotary motion output by the rotary driving piece into the linear motion of the push-pull disc; the push-pull rod can be matched with the connecting piece to convert the linear motion of the push-pull disc into the rotation of the main arm around the hinged position of the main arm and the main rod piece.

Optionally, the push-pull rod penetrates through the push-pull disc and is in sliding fit with the push-pull disc, an energy storage spring is sleeved on the push-pull rod, a shaft shoulder is machined on the push-pull rod, one end of the energy storage spring abuts against the shaft shoulder, and the other end of the energy storage spring abuts against one side, back to the rotary driving member, of the push-pull disc; and an anti-drop head is fixed at one end of the push-pull rod between the rotary driving piece and the push-pull disc.

By adopting the technical scheme, when the rotary driving piece drives the push-pull rod to continuously extend out of the main rod piece through the transmission assembly, the push-pull disc can push the push-pull rod outwards through the energy storage spring. The energy storage spring can play a certain role in buffering and protecting. When the rotary driving member drives the push-pull rod to continuously retract into the main rod member through the transmission assembly, the push-pull disc drags the push-pull rod back into the main rod member by pulling the anti-drop head.

Optionally, the transmission assembly includes a nut, a screw rod and a torque limiter, the torque limiter is connected between the output shaft of the rotary driving member and the screw rod, the nut is sleeved on the screw rod and is in threaded fit with the screw rod, and a transmission rod is connected between the nut and the push-pull disc; and a transmission rod is connected between the nut and the push-pull disc.

Through adopting above-mentioned technical scheme, the effect of moment of torsion limiter lies in when the nut moves extreme position, cuts off the transmission between rotary driving spare and the lead screw, protects rotary driving spare.

In the related art, a travel contact switch is generally adopted to protect the rotary driving part, namely, the travel contact switch is used for monitoring whether a nut moves to a limit position or not, and the travel contact switch outputs a feedback signal after the nut moves to the limit position, so that a controller controls the rotary driving part to stop rotating; however, the travel contact switch includes some electronic components, which results in low reliability in a high-temperature and high-pressure operating environment. The torque limiter is a purely mechanical component, and has higher reliability under high temperature conditions relative to the reliability of the travel contact switch.

Optionally, the hydraulic balance device comprises an oil storage chamber arranged on the main rod element, one end of the oil storage chamber is communicated with the installation chamber, the other end of the oil storage chamber is communicated with the outside, and a balance piston is arranged in the oil storage chamber in a sliding mode.

Through adopting above-mentioned technical scheme, can balance stock solution room internal pressure intensity and external environment pressure intensity.

Optionally, the collecting module comprises a collecting pole plate, a main arm connecting piece, a connecting sleeve and an auxiliary arm connecting piece;

the collecting polar plate comprises an installation body and a wire inlet pipe fixed at one end of the installation body;

the connecting sleeve is sleeved outside the wire inlet pipe and is in screw connection with the mounting body, one side of the connecting sleeve is provided with a first pin hole communicated with the inside of the connecting sleeve, a first pin rod in interference fit with the first pin hole is arranged in the first pin hole, and the outer side wall of the wire inlet pipe is provided with a pin groove matched with the first pin rod;

one end of the main arm connecting piece is rotatably connected with the connecting sleeve, and the other end of the main arm connecting piece is hinged with the main arm;

one end of the auxiliary arm connecting piece is rotatably connected with the collecting pole plate, and the other end of the auxiliary arm connecting piece is hinged with the auxiliary arm.

Through adopting above-mentioned technical scheme, use screw and first pin rod to connect collection polar plate and adapter sleeve, the reliability is high, can be with the stable and firm connection of adapter sleeve on the collection polar plate, reduces the accumulative error of collection module to can improve the logging precision of installing this collection module's little resistivity scanning imager.

Optionally, the connecting sleeve further comprises a second sleeve body integrally formed at one end of the first sleeve body, which is far away from the mounting body, and a limiting ring is integrally formed on the peripheral side wall of the second sleeve body;

the main arm connecting piece comprises a first fastener and a second fastener, the first fastener is buckled with the second fastener, the first fastener and the second fastener are in screw connection, an accommodating space is formed between the first fastener and the second fastener, and the second sleeve body and the limiting ring are rotatably connected in the accommodating space.

By adopting the technical scheme, the main arm connecting piece and the connecting sleeve can be assembled and disassembled conveniently.

Optionally, a first accommodating groove is formed in one side of the first fastener; the second fastener is arranged in the first accommodating groove, a second accommodating groove is formed in the second fastener, and the second accommodating groove faces the bottom of the first accommodating groove.

Through adopting above-mentioned technical scheme for form the accommodation space who holds adapter sleeve and spacing ring between first fastener and the second fastener.

Optionally, a second pin hole communicated with the first accommodating groove is formed in the first fastener, a third pin hole is formed in the second fastener, a second pin rod is inserted into the second pin hole and the third pin hole, and the second pin rod is in interference fit with the second pin hole and the third pin hole.

Through adopting above-mentioned technical scheme for be connected more stable and firm between first fastener and the second fastener, the reliability is high.

Optionally, the mounting body includes a front housing and a rear cover, and the rear cover is connected to one side of the front housing; a first mounting groove and a second mounting groove are formed in one side, facing the rear cover body, of the front cover body, and the first mounting groove and the second mounting groove are sealed through the rear cover body; an annular groove is formed in one side, facing the rear cover body, of the front cover body, and the first mounting groove and the second mounting groove are located in an annular area formed by the annular groove; and a sealing ring is arranged in the annular groove.

By adopting the technical scheme, the rear cover is adopted to seal the first mounting groove and the second mounting groove, so that the collecting polar plate is more convenient for workers to assemble; moreover, the first mounting groove and the second mounting groove are sealed by the matching of the rear cover and the sealing ring, the liquid leakage risk is small, and the sealing effect is better.

Optionally, the collecting module is parallel to the main rod body.

By adopting the technical scheme, the acquisition module can be tightly attached to the well wall during well logging.

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

1. when the small-diameter micro-resistivity scanning imager is in an open state, the main arm, the acquisition module and the auxiliary arm are in an isosceles trapezoid structure, so that the small-diameter micro-resistivity scanning imager can be used for well logging in the lowering process and the lifting process, and the well logging efficiency is improved;

2. the hydraulic balancing device can balance the internal pressure intensity of the liquid storage chamber and the external environment pressure intensity, so that external liquid and impurities are not easy to extend out of the mounting chamber from the push-pull device and enter the mounting chamber, the sealing property of the mounting chamber is effectively improved, and the small-diameter micro-resistivity scanning imager can be normally used under the condition of higher pressure;

3. the acquisition polar plate and the connecting sleeve are connected by using the screw and the first pin rod, so that the reliability is high, the connecting sleeve can be stably and firmly connected to the acquisition polar plate, and the accumulated error of the acquisition module is reduced, so that the logging precision of a micro-resistivity scanning imager provided with the acquisition module can be improved;

4. the rear cover is adopted to seal the first mounting groove and the second mounting groove, so that the collecting polar plate is more convenient for workers to assemble; moreover, the first mounting groove and the second mounting groove are sealed by the matching of the rear cover and the sealing ring, the liquid leakage risk is small, and the sealing effect is better.

Drawings

Fig. 1 is a schematic view of the overall structure of a small-diameter microresistivity scanning imager.

Fig. 2 is a schematic view showing a connection structure between the secondary collection module and the main rod.

Fig. 3 is a schematic structural diagram of an acquisition module.

Figure 4 is an exploded view of a structure embodying the collector plate.

Fig. 5 is an exploded view showing a connecting structure of the main arm connecting member and the connecting sleeve.

Fig. 6 is a schematic view showing a connection structure of the sub-arm, the slider, and the spring plate.

Figure 7 is a schematic diagram of a structure embodying the push-pull device.

Fig. 8 is an enlarged schematic view at a in fig. 7.

Fig. 9 is a schematic view showing a connection structure of the nut and the stopper.

Fig. 10 is an enlarged schematic view at B in fig. 7.

Description of reference numerals: 1. a main bar member; 11. a first bar member; 111. an installation chamber; 12. a second bar member; 2. an acquisition module; 21. collecting a polar plate; 211. a front housing; 212. a rear cover body; 213. a wire inlet pipe; 214. a detection section; 215. an installation section; 216. a first mounting groove; 217. a second mounting groove; 218. an electrode member; 219. an electrode hole; 220. a support boss; 221. a support table; 222. a circuit board; 223. a seal ring; 23. connecting sleeves; 231. a first sleeve body; 232. a side connecting block; 233. a second sleeve body; 234. a first pin hole; 235. a pin slot; 236. a first pin rod; 237. a limiting ring; 24. a main arm connecting piece; 241. a first fastener; 242. a second fastener; 245. a second pin hole; 246. a third pin hole; 247. a second pin; 25. a secondary arm connecting member; 31. an auxiliary arm; 32. a slider; 33. an auxiliary accommodating groove; 34. a spring plate; 35. a limiting groove; 41. a main arm; 42. a main accommodating groove; 43. a mounting cavity; 44. connecting sheets; 5. a push-pull device; 51. a rotary drive member; 52. a push-pull disc; 53. a push-pull rod; 54. a nut; 541. a limiting block; 55. a screw; 56. a torque limiter; 57. a transmission rod; 571. a guide hole; 58. an energy storage spring; 59. the head is prevented from falling off; 6. a hydraulic balancing device; 61. an oil storage chamber; 62. a balance hole; 63. a balance piston; 64. and a liquid passing pipe.

Detailed Description

The present application is described in further detail below with reference to figures 1-10.

The embodiment of the application discloses a small-diameter micro-resistivity scanning imager.

Referring to fig. 1 and 2, the small-diameter micro-resistivity scanning imager includes a main rod 1 and a plurality of acquisition modules 2. The main rod member 1 includes a first rod member 11 and a second rod member 12, the first rod member 11 is a cylinder, and the second rod member 12 extends into the first rod member 11 and is fixedly connected with the first rod member 11. 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, the acquisition modules 2 are staggered in the axial direction of the second rod 12, and each acquisition module 2 is parallel to the main rod 1.

Referring to fig. 3 and 4, the acquisition module 2 includes an acquisition pole plate 21, a main arm connector 24, a connection sleeve 23, and a sub arm connector 25. The collecting pole plate 21 comprises a mounting body and a wire inlet pipe 213 connected to one end of the mounting body. The mounting body includes a front housing 211 and a rear cover 212, the rear cover 212 is screw-coupled to one side of the front housing 211, and a wire inlet pipe 213 is integrally formed with the front housing 211. For convenience of description, the mounting body is divided into two sections, one section is a detection section 214, and the other section is a mounting section 215, wherein the width of the mounting section 215 is smaller than that of the detection section 214, so as to avoid the main arm connecting piece 24, so that the acquisition module 2 can be more compact when being folded onto the main rod piece 1, and the micro-resistivity scanning imager can have a smaller diameter.

It should be noted that, in the four collecting electrode plates 21, the inlet pipes 213 of two collecting electrode plates 21 are connected to the end of the detecting section 214 far away from the mounting section 215, and the inlet pipes 213 of the other two collecting electrode plates 21 are connected to the end of the mounting section 215 far away from the detecting section 214.

Referring to fig. 3 and 4, a first mounting groove 216 and a second mounting groove 217 which are communicated with each other are formed in one side of the front housing 211 facing the rear cover 212, the first mounting groove 216 and the second mounting groove 217 are respectively located in the detection section 214 and the mounting section 215, and the first mounting groove 216 and the second mounting groove 217 are both closed by the rear cover 212; it should be noted that the inlet pipe 213, the first installation groove 216, and the second installation groove 217 communicate with each other. An electrode member 218 is disposed in the first mounting groove 216, and a plurality of electrode holes 219 are opened on the front case 211 to expose the electrodes, in this embodiment, the electrode holes 219 are twenty-five, and are arranged in two rows.

Referring to fig. 4, a supporting protrusion 220 is disposed in the middle of the second mounting groove 217, the supporting protrusion 220 and the front housing 211 are integrally formed, and when the rear cover 212 is connected to the front housing 211, the supporting protrusion 220 abuts against the rear cover 212 to support the rear cover 212, so that the rear cover 212 is not easily deformed or damaged due to too large pressure. In addition, two support tables 221 are arranged in the second mounting groove 217; a circuit board 222 is further provided in the second mounting groove 217, and the circuit board 222 is screw-coupled to the support body.

An annular groove is formed in one side of the front housing 211 facing the rear cover 212, and a sealing ring 223 is installed in the annular groove, and it should be noted that the first installation groove 216 and the second installation groove 217 are both located in an annular region surrounded by the annular groove. Adopt a back lid 212 cooperation sealing washer 223 to seal first mounting groove 216 and second mounting groove 217 for liquid is difficult gets into first mounting groove 216 and second mounting groove 217 from between preceding casing 211 and the back lid 212, and is sealed effectual, and the weeping risk is little.

Referring to fig. 4, two side edges of the rear cover 212 facing away from the front cover 211 are each machined with a relief chamfer. The arrangement of the avoiding chamfer ensures that the space between two adjacent acquisition modules 2 can be more compact, and is beneficial to making the micro-resistivity scanning imager smaller in diameter; in the present embodiment, it is preferred that,

referring to fig. 4, the connection sleeve 23 includes a first sleeve 231 sleeved outside the inlet pipe 213, a side connection block 232 integrally formed at an end of the first sleeve 231 close to the mounting body, and a second sleeve 233 integrally formed at an end of the first sleeve 231 far from the mounting body.

Specifically, two side connection blocks 232 are provided, the two side connection blocks 232 are symmetrically provided on the circumferential side wall of the first housing 231, and the side connection blocks 232 are screw-coupled with the front housing 211. In addition, two first pin holes 234 communicated with the inside of the first sleeve 231 are formed in the first sleeve 231, two pin grooves 235 are symmetrically formed in the outer side wall of the wire inlet pipe 213, the two first pin holes 234 are aligned with the two pin grooves 235 one by one, and first pin rods 236 in interference fit with the first pin holes 234 and the pin grooves 235 are inserted into the corresponding first pin holes 234 and the corresponding pin grooves 235. The acquisition polar plate 21 and the connecting sleeve 23 are connected by using the screw and the first pin rod 236, so that the connecting sleeve 23 can be stably and firmly connected to the acquisition polar plate 21, and the accumulated error of the acquisition module 2 is effectively reduced.

Referring to fig. 5, a stopper ring 237 is integrally formed on the outer circumferential wall of the second housing 233. The main arm connecting member 24 is rotatably connected to the second casing 233 and includes a first fastening member 241 and a second fastening member 242. A first receiving groove is formed in one side of the first fastening element 241, and two hinge lugs are integrally formed at one end of the first fastening element, which is far away from the collecting pole plate 21. The second fastening member 242 is disposed in the first receiving groove, a second receiving groove is disposed on the second fastening member 242, a notch of the second receiving groove faces a bottom of the first receiving groove, and the first receiving groove and the second receiving groove are disposed between the first fastening member 241 and the second fastening member 242 to form a receiving space capable of just receiving the second sleeve 233 and the spacing ring 237, and the second sleeve 233 and the spacing ring 237 are rotatably connected in the receiving space.

Referring to fig. 5, a second pin hole 245 is formed in the first fastening member 241 along a direction perpendicular to the axis of the second sleeve 233, and the second pin hole 245 is communicated with the first receiving groove. A third pin hole 246 is formed in the second fastening member 242 along a direction perpendicular to the axis of the second sleeve 233. The second pin hole 245 is aligned with the third pin hole 246, and a second pin 247 is inserted into the second pin hole 245 and the third pin hole 246, the second pin 247 being an interference fit with the second pin hole 245 and the third pin hole 246. In addition, the first fastening member 241 is connected to the second fastening member 242 by screws. The first fastening member 241 and the second fastening member 242 are connected by a screw and the second pin 247, so that the first fastening member 241 and the second fastening member 242 can be stably and firmly connected together.

Referring to fig. 2 and 3, the sub-arm link 25 is rotatably connected to an end of the collecting plate 21 remote from the main arm link 24. The end of the sub-arm connecting piece 25 far away from the collecting pole plate 21 is hinged with a sub-arm 31, and the end of the sub-arm 31 far away from the collecting module 2 is hinged with a sliding piece 32 through a pin shaft. An auxiliary accommodating groove 33 for accommodating the auxiliary arm 31 is formed on the peripheral side wall of the second rod 12 away from the first rod 11, and the sliding member 32 is connected in the auxiliary accommodating groove 33 in a sliding manner along the length direction of the second rod 12.

Referring to fig. 2 and 6, a stabilizer is also connected between the secondary arm 31 and the slider 32, and in this embodiment, the stabilizer includes a spring plate 34. A limiting groove 35 is formed in one side of the auxiliary arm 31 facing the second rod 12, one end of the spring piece 34 is in screw connection with the sliding part 32, and the other end of the spring piece extends into the limiting groove 35 and is abutted against the bottom of the limiting groove 35.

Referring to fig. 2, a main arm 41 is hinged to one end of the main arm connecting piece 24 away from the collecting pole plate 21, a plurality of main accommodating grooves 42 for accommodating the main arm 41 are formed on the peripheral side wall of the second rod piece 12 close to the first rod piece 11, and one end of the main arm 41 away from the collecting module 2 extends into the corresponding accommodating groove and is hinged to the second rod piece 12 through a pivot. An avoidance space of the avoidance collection module 2 is formed in the middle of the second bar 12, and the avoidance space is communicated with each main accommodation groove 42 and each auxiliary accommodation groove 33. Referring to fig. 7, a mounting cavity 43 is formed at an end of the second pin 12 adjacent to the first pin 11, and the mounting cavity 43 communicates with each of the main receiving grooves 42.

Referring to fig. 7 and 8, the first rod 11 forms an installation chamber 111 therein, and the push-pull 5 is disposed in the installation chamber 111. The push-pull device 5 comprises a rotary driving member 51, a transmission assembly, a push-pull disc 52 and a push-pull rod 53 which are arranged in the mounting chamber 111, wherein the rotary driving member 51 is fixedly arranged in the mounting chamber 111, and the rotary driving member 51 adopts an oil-immersed high-temperature motor in the embodiment. The transmission assembly is arranged between the push-pull discs 52 and comprises a nut 54, a screw 55 and a torque limiter 56, wherein the screw is parallel to the output shaft of the rotary driving piece 51; a torque limiter 56 is fixedly connected between the screw and the output shaft of the rotary drive. A stepped hole penetrating through two ends of the nut 54 is formed in the nut 54, and threads are machined on the wall of the stepped hole; the lead screw extends into the stepped bore through the small diameter end of the stepped bore and is threadedly connected with the nut 54. In addition, referring to fig. 9, a limiting block 541 is connected to an outer side wall of the nut 54 by a bolt, a sliding groove (not shown) is formed in a wall of the installation chamber 111, and the limiting block 541 extends into the sliding groove and is in sliding fit with the sliding groove.

Referring to fig. 8, a driving rod 57 is fixedly connected to a side of the push-pull disc 52 facing the nut 54, and an end of the driving rod 57 away from the push-pull disc 52 extends into the stepped hole through a large diameter end of the stepped hole and is in threaded connection with the nut 54. It should be noted that, in order to improve the rotation stability of the screw rod, a guide hole 571 is formed on an end surface of the transmission rod 57 extending into the stepped hole, and the screw rod extends into the guide hole 571 and is in sliding fit with the transmission rod 57.

When the rotary driving member 51 drives the screw rod to rotate forward through the torque limiter 56, the screw rod drives the nut 54 to move along the sliding slot in a direction away from the rotary driving member 51, and the nut 54 drives the push-pull disc 52 to move in a direction away from the rotary driving member 51 through the transmission rod 57. When the rotary driving member 51 drives the screw rod to rotate reversely through the torque limiter 56, the screw rod drives the nut 54 to move along the sliding slot in a direction approaching the rotary driving member 51, and the nut 54 drives the push-pull plate 52 to move in a direction approaching the rotary driving member 51 through the transmission rod 57.

The main function of the torque limiter 56 is to protect the rotary drive 51; when the nut 54 moves to the limit position, if the rotary drive member 51 is still under the control of early sitting, the torque limiter 56 will cut off the transmission between the rotary drive member 51 and the lead screw, so that the output shaft of the rotary drive member 51 can rotate without being locked, thereby protecting the rotary drive member 51. The torque limiter 56 is a purely mechanical component with greater reliability at high temperatures relative to the trip contact switch, thereby enabling the small diameter microresistivity scanner to operate stably at higher temperatures.

Referring to fig. 7 and 8, at least one (four in this embodiment) push-pull rod 53 is provided, and a through hole through which the push-pull rod 53 passes is formed in the second rod 12, and the through hole communicates the installation cavity 43 and the installation chamber 111. In addition, a first through hole is formed in the push-pull disc 52, one end of the push-pull rod 53 penetrates through the push-pull disc 52 through the first through hole, and the other end penetrates through the installation cavity 43 through the through hole. An energy storage spring 58 is sleeved on the push-pull rod 53, and a shaft shoulder is processed in the middle of the push-pull rod 53 for fixing the energy storage spring 58; one end of the energy storage spring 58 abuts against the shaft shoulder, and the other end abuts against the side of the push-pull plate 52 facing away from the nut 54. An anti-slip head 59 is fixed to one end of the push-pull rod 53 between the nut 54 and the push-pull disc 52.

Referring to fig. 8, a connecting piece 44 is hinged to the end of the main arm 41 hinged to the second rod 12, and the end of the connecting piece 44 away from the main arm 41 is hinged to the end of the push-pull rod 53 extending out of the mounting chamber 111.

When the rotary driving member 51 drives the push-pull rod 53 to continuously extend out of the main rod member 1 through the transmission assembly, the push-pull disc 52 pushes the push-pull rod 53 outwards through the energy storage spring 58, the push-pull rod 53 pushes the main arm 41 to rotate through the connecting sheet 44, meanwhile, the sliding member 32 slides in the auxiliary accommodating groove 33 in the direction close to the acquisition module 2, and the auxiliary arm 31 rotates around the pin shaft under the action of the elastic member, so that the small-diameter micro-resistivity scanning imager is gradually opened.

In the opening process of the small-diameter micro-resistivity scanning imager, the acquisition module 2 is always positioned between the push-pull device 5 and the sliding part 32; under the condition of no external force intervention, the sequential connecting lines of the hinge point of the main arm 41 and the main rod element 1, the hinge point of the main arm 41 and the acquisition module 2, the hinge point of the acquisition module 2 and the auxiliary arm 31 and the hinge point of the auxiliary arm 31 and the sliding element 32 form an isosceles trapezoid; therefore, the small-diameter micro-resistivity scanning imager can be used for well logging in the lowering process and the lifting process, and the well logging efficiency is effectively improved.

When the rotary driving member 51 drives the push-pull rod 53 to continuously retract into the main rod member 1 through the transmission assembly, the push-pull disc 52 pulls the push-pull rod 53 back into the main rod member 1 by pulling the anti-drop head 59, the push-pull rod 53 drives the main arm 41 to rotate through the connecting piece 44, meanwhile, the sliding member 32 slides in the auxiliary accommodating groove 33 in the direction away from the acquisition module 2, and the auxiliary arm 31 rotates around the pin shaft and compresses the spring piece 34, so that the small-diameter micro-resistivity scanning imager is gradually folded.

Referring to fig. 7 and 10, a hydraulic pressure balancing device 6 for balancing the pressure of the fluid inside and outside the installation chamber 111 is provided on the main lever member 1.

The hydraulic balance device 6 comprises an oil storage chamber 61, the oil storage chamber 61 is fixedly connected to one end, far away from the first rod piece 11, of the second rod piece 12, and a cavity is arranged in the oil storage chamber 61. A balance hole 62 communicating the inside with the outside is opened in a side wall of the oil chamber 61 near the second pin 12. A balance piston 63 is slidably provided in the oil reservoir 61, and a second through hole is opened in the balance piston 63. A liquid passing pipe 64 is provided between the oil storage chamber 61 and the mounting chamber 111, the liquid passing pipe 64 is inserted into the second rod 12, and one end thereof is located in the mounting chamber 111, and the other end thereof passes through the balance piston 63 via the second through hole, so that the oil storage chamber 61 and the mounting chamber 111 are communicated with each other. In use, the oil reservoir chamber 61 and the mounting chamber 111 are filled with hydraulic oil.

When the push-pull rod 53 is driven by the rotary driving member 51 to continuously extend out of the mounting chamber 111, the liquid volume of the mounting chamber 111 increases, so that the liquid pressure in the mounting chamber 111 is lower than the external pressure, and at this time, the external liquid pushes the balance piston 63 to move away from the mounting chamber 111 until the liquid pressure in the mounting chamber 111 and the external pressure are in a balanced state again. When the push-pull rod 53 is driven by the rotary driving member 51 to retract into the mounting chamber 111, the volume of the liquid in the mounting chamber 111 decreases, so that the pressure of the liquid in the mounting chamber 111 is higher than the external pressure, and at this time, the balance piston 63 moves towards the mounting chamber 111 under the pushing of the hydraulic oil until the pressure of the liquid in the mounting chamber 111 and the external pressure are in a balanced state again.

The balance piston 63 can make the liquid pressure in the installation chamber 111 and the external pressure in a relatively balanced state, so that the external liquid and impurities are not easy to enter the installation chamber 111 from the sealing connection position of the push-pull rod 53 and the main rod member 1, the sealing property is effectively improved, and the small-diameter micro-resistivity scanning imager can be normally used under the condition of higher pressure.

In the embodiment, the structure of the collecting polar plate 21 is improved, so that the maximum outer diameter of the small-diameter micro-resistivity scanning imager can be 92mm, and the small-diameter micro-resistivity scanning imager is suitable for logging a small borehole. Through tests, due to the arrangement of the hydraulic balance device 6, the small-diameter micro-resistivity scanning imager can stably work under the working condition of 180 MPa of pressure; the small diameter microresistivity scanner can operate stably downhole at 200 c due to the use of torque limiter 56 instead of forming contact switches.

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

1. A small-diameter micro-resistivity scanning imager is characterized in that: including main rod piece (1) and a plurality of collection module (2) that set up around main rod piece (1) circumference, characterized by: one end of the acquisition module (2) is hinged with a main arm (41), and the other end is hinged with an auxiliary arm (31);

one end, far away from the acquisition module (2), of the main arm (41) is hinged to the main rod piece (1), an installation chamber (111) is arranged in the main rod piece (1), a push-pull device (5) is arranged in the installation chamber (111), and a part in the push-pull device (5) extends out of the installation chamber (111) to be connected with the main arm (41) so as to drive the main arm (41) to rotate around the hinged position of the main arm (41) and the main rod piece (1);

one end, far away from the acquisition module (2), of the auxiliary arm (31) is hinged with a sliding part (32), the sliding part (32) 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 (32) is connected with a stability maintaining device, and the stability maintaining device applies force to the auxiliary arm (31) to rotate towards the direction far away from the main rod piece (1) around the hinged position of the auxiliary arm and the sliding part (32);

the acquisition module (2) is located between the push-pull device (5) and the sliding part (32);

the main rod piece (1) is provided with a hydraulic balancing device (6) for balancing the pressure of the liquid inside and outside the mounting chamber (111).

2. A small diameter microresistivity scanning imager as claimed in claim 1 wherein: the stability maintaining device comprises a spring piece (34), and two ends of the spring piece (34) are respectively connected to the sliding piece (32) and the auxiliary arm (31).

3. A small diameter microresistivity scanning imager as claimed in claim 1 wherein: the push-pull device (5) comprises a rotary driving piece (51) arranged in the mounting chamber (111), a transmission assembly, a push-pull disc (52) and a push-pull rod (53); the transmission assembly is connected between the rotary driving piece (51) and the push-pull disc (52) and is used for converting the rotary motion output by the rotary driving piece (51) into the linear motion of the push-pull disc (52); one end of the push-pull rod (53) is connected with the push-pull disc (52), and the other end of the push-pull rod extends out of the mounting chamber (111);

the main arm (41) is hinged to one end of the main rod piece (1) through a connecting piece (44), and one end, far away from the main arm (41), of the connecting piece (44) is hinged to one end, extending out of the mounting chamber (111), of the push-pull rod (53).

4. A small diameter microresistivity scanning imager as claimed in claim 3, wherein:

the push-pull rod (53) penetrates through the push-pull disc (52) and is in sliding fit with the push-pull disc (52), an energy storage spring (58) is sleeved on the push-pull rod (53), a shaft shoulder is machined on the push-pull rod (53), one end of the energy storage spring (58) is abutted against the shaft shoulder, and the other end of the energy storage spring is abutted against one side, back to the rotary driving piece (51), of the push-pull disc (52); an anti-falling head (59) is fixed at one end of the push-pull rod (53) between the rotary driving piece (51) and the push-pull disc (52).

5. A small diameter microresistivity scanning imager as claimed in claim 3, wherein: the transmission assembly comprises a nut (54), a screw rod (55) and a torque limiter (56), the torque limiter (56) is connected between an output shaft of the rotary driving piece (51) and the screw rod (55), the nut (54) is sleeved on the screw rod (55) and is in threaded fit with the screw rod (55), the nut (54) is connected with the main rod piece (1) in a sliding mode, and a part in the main rod piece (1) can limit the nut (54) from rotating in the main rod piece (1); a transmission rod (57) is connected between the nut (54) and the push-pull disc (52).

6. A small diameter microresistivity scanning imager as claimed in claim 1 wherein: the hydraulic balance device (6) comprises an oil storage chamber (61) arranged on the main rod piece (1), one end of the oil storage chamber (61) is communicated with the installation chamber (111), the other end of the oil storage chamber is communicated with the outside, and a balance piston (63) is arranged in the oil storage chamber (61) in a sliding mode.

7. A small diameter microresistivity scanning imager as claimed in claim 1 wherein: the collecting module (2) comprises a collecting pole plate (21), a main arm connecting piece (24), a connecting sleeve (23) and an auxiliary arm connecting piece (25);

the collecting polar plate (21) comprises an installation body and a wire inlet pipe (213) fixed at one end of the installation body;

the connecting sleeve (23) is sleeved outside the inlet pipe (213), the connecting sleeve (23) is in screw connection with the mounting body, one side of the connecting sleeve (23) is provided with a first pin hole (234) communicated with the inside of the connecting sleeve, a first pin rod (236) in interference fit with the first pin hole (234) is arranged in the first pin hole, and the outer side wall of the inlet pipe (213) is provided with a pin groove (235) matched with the first pin rod (236);

one end of the main arm connecting piece (24) is rotatably connected with the connecting sleeve (23), and the other end of the main arm connecting piece is hinged with the main arm (41);

one end of the auxiliary arm connecting piece (25) is rotatably connected with the collecting pole plate (21), and the other end of the auxiliary arm connecting piece is hinged with the auxiliary arm (31).

8. A small diameter microresistivity scanning imager in accordance with claim 7, wherein: the connecting sleeve (23) also comprises a second sleeve body (233) which is integrally formed at one end of the first sleeve body (231) far away from the mounting body, and a limiting ring (237) is integrally formed on the peripheral side wall of the second sleeve body (233);

the main arm connecting piece (24) comprises a first fastener (241) and a second fastener (242), the first fastener (241) is buckled with the second fastener (242) and is in screw connection with the second fastener (242), an accommodating space is formed between the first fastener (241) and the second fastener (242), and the second sleeve body (233) and the limiting ring (237) are rotatably connected in the accommodating space.

9. A small diameter microresistivity scanning imager in accordance with claim 8, wherein: a first accommodating groove is formed in one side of the first fastener (241); the second fastener (242) is arranged in the first accommodating groove, a second accommodating groove is formed in the second fastener (242), and the second accommodating groove faces the bottom of the first accommodating groove.

10. A small diameter microresistivity scanning imager in accordance with claim 9, wherein: the first fastener (241) is provided with a second pin hole (245) communicated with the first accommodating groove, the second fastener (242) is provided with a third pin hole (246), the second pin hole (245) and the third pin hole (246) are connected with a second pin rod (247) in an inserting mode, and the second pin rod (247) is in interference fit with the second pin hole (245) and the third pin hole (246).

11. A small diameter microresistivity scanning imager in accordance with claim 7, wherein: the mounting body includes a front case (211) and a rear cover (212), the rear cover (212) being coupled to one side of the front case (211); a first mounting groove (216) and a second mounting groove (217) are formed in one side, facing the rear cover body (212), of the front cover body (211), and the first mounting groove (216) and the second mounting groove (217) are sealed through the rear cover body (212); an annular groove is formed in one side, facing the rear cover body (212), of the front cover body (211), and the first installation groove (216) and the second installation groove (217) are located in an annular area formed by the annular groove; a sealing ring (223) is arranged in the annular groove.

12. A small diameter microresistivity scanning imager as claimed in any one of claims 1 to 12, wherein: the acquisition module (2) is parallel to the main rod body (1).