Ultrasonic sensor and logging-while-drilling instrument

Abstract

The ultrasonic sensor comprises a base body detachably connected with a drill collar of the logging-while-drilling instrument, the base body is provided with a closed pressure balance cavity and an ultrasonic probe installation cavity, and pressure oil used for balancing slurry pressure is injected into the pressure balance cavity; an ultrasonic probe is arranged in the ultrasonic probe mounting cavity in a limiting manner, and the pressure balance cavity is communicated with the ultrasonic probe mounting cavity through an oil path communication hole; the base body is provided with a pressure-bearing contact pin installation bin isolated from slurry, a pressure-bearing contact pin is arranged in the pressure-bearing contact pin installation bin in a limiting mode, the ultrasonic probe installation cavity is communicated with the pressure-bearing contact pin installation bin through a wire passing hole, and a wire connected with the ultrasonic probe and the pressure-bearing contact pin is arranged in the wire passing hole. According to the ultrasonic sensor, pressure balance in the ultrasonic sensor in a high-temperature and high-pressure environment is ensured, and the service life of the ultrasonic probe is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of logging while drilling, and in particular relates to an ultrasonic sensor and a logging while drilling instrument. Background Art

[0002] With the continuous depletion of oil resources, conventional oil production can no longer meet today's oil demand. Therefore, unconventional oil production has become increasingly important. Unconventional oil production is characterized by more complex working conditions, greater difficulty and greater cost. To cope with the complex working conditions of unconventional oil production, it is particularly important to develop an instrument that can generate real-time wellbore wall images. The ultrasonic imaging logging tool can obtain real-time wellbore wall images and geological information such as fractures in a drilling environment, which is of great significance to the development of oil and gas resources.

[0003] For ultrasonic imaging logging while drilling (LWD) tools, the ultrasonic probe, a key component, transmits and receives ultrasonic waves. The amplitude and timing of the resulting echo signal can be used to determine the roughness of the wellbore wall and the different acoustic impedances of rocks. The ultrasonic probe continuously scans the wellbore wall while drilling, continuously acquiring images of the wellbore wall. Therefore, developing an ultrasonic sensor for LWD is of great significance to unconventional oil production. Summary of the Invention

[0004] In order to solve all or part of the above problems, the present invention aims to provide an ultrasonic sensor and a logging while drilling instrument. The ultrasonic sensor of the present invention ensures the pressure balance inside the ultrasonic sensor under high temperature and high pressure environment, thereby improving the service life of the ultrasonic probe.

[0005] According to one aspect of the present invention, an ultrasonic sensor is provided, comprising a base body detachably connected to a drill collar of a logging-while-drilling instrument, the base body being provided with a closed pressure-balancing chamber and an ultrasonic probe mounting chamber, the pressure-balancing chamber being injected with pressure oil for balancing mud pressure, an ultrasonic probe being positionally disposed in the ultrasonic probe mounting chamber, and the pressure-balancing chamber and the ultrasonic probe mounting chamber being connected via an oil communication hole; the base body being provided with a pressure-bearing pin mounting compartment isolated from mud, the pressure-bearing pin being positionally disposed in the pressure-bearing pin mounting compartment, the ultrasonic probe mounting chamber and the pressure-bearing pin mounting compartment being connected via a wire hole, and a wire connecting the ultrasonic probe and the pressure-bearing pin being disposed in the wire hole. Furthermore, a first protrusion is provided on the base body near the drill collar side, the first protrusion is fixedly connected to a second cover plate, and a second cover plate sealing ring is provided between the second cover plate and the first protrusion; a pressure balance chamber is provided on the first protrusion and passes through the base body, and a first cover plate groove is provided on the base body away from the drill collar side, a rubber pad and a first cover plate are provided in the first cover plate groove, the first cover plate is fixedly connected to the base body by fasteners, the rubber pad is provided between the first cover plate and the base body, the pressure balance chamber is located in the first cover plate groove, and the pressure balance chamber is located in the second cover plate sealing ring; the pressure balance chamber is a cavity between the second cover plate, the pressure balance chamber and the rubber pad, and the first cover plate is provided with a mud through hole that enables mud to act on the rubber pad. Furthermore, an oil filling hole for injecting pressure oil into the pressure balance cavity is provided on the second cover plate corresponding to the pressure balance chamber, and the oil filling hole is connected to an oil seal.

[0006] Furthermore, the second cover plate is fixed to the first protrusion of the base through a fastener, a second cover plate sealing groove is provided on the first protrusion, and the second cover plate sealing ring is provided in the second cover plate sealing groove. Furthermore, an ultrasonic probe mounting compartment is provided on the first protrusion and passes through the base body. The ultrasonic probe mounting compartment is located in the second cover plate sealing ring. A shrinking ring is provided on the side of the ultrasonic probe mounting compartment away from the drill collar. The ultrasonic probe is limited between the shrinking ring and the second cover plate. An ultrasonic probe sealing ring is provided between the ultrasonic probe mounting compartment and the ultrasonic probe. The ultrasonic probe mounting cavity is a cavity between the ultrasonic probe mounting compartment, the ultrasonic probe sealing ring, the ultrasonic probe and the second cover plate.

[0007] Furthermore, the oil circuit connecting hole is provided on a side of the second cover plate close to the pressure balance chamber, and the oil circuit connecting hole is located inside the sealing ring of the second cover plate.

[0008] Furthermore, a second protrusion is provided on the base body near the drill collar side, the pressure-bearing pin mounting chamber is provided on the second protrusion and passes through the base body, a limiting step is provided on the side wall of the pressure-bearing pin mounting chamber, a retaining spring is connected to the pressure-bearing pin mounting chamber, and the pressure-bearing pin is limited between the limiting step and the retaining spring. Furthermore, a third cover plate groove is provided on the base body on the side away from the drill collar, a third cover plate is provided in the third cover plate groove, the third cover plate is fixedly connected to the base body by fasteners, a third cover plate sealing ring is provided between the third cover plate and the base body, a pressure-bearing pin sealing ring is provided between the base body and the drill collar, the pressure-bearing pin mounting compartment is located in the third cover plate sealing ring, the pressure-bearing pin mounting compartment is located in the pressure-bearing pin sealing ring, and the pressure-bearing pin is isolated from mud by the third cover plate sealing ring and the pressure-bearing pin sealing ring.

[0009] Furthermore, a first threaded hole is provided at both ends of the base, and the base is detachably connected to the drill collar through a first screw provided in the first threaded hole; a second threaded hole is also provided on the base, and a second screw is connected in the second threaded hole.

[0010] The present invention also provides a logging while drilling instrument, comprising a drill collar, on which the ultrasonic sensor described in any one of the above items is arranged.

[0011] As can be seen from the above technical solutions, the ultrasonic sensor and logging-while-drilling instrument provided by the present invention have the following beneficial effects: The present invention adopts a rubber balance form and pressure oil as a sealing medium, which ensures the pressure balance inside the ultrasonic sensor under high temperature and high pressure environment and prolongs the service life of the ultrasonic probe; Integrating the pressure-bearing pins of electrical components into the pressure-bearing pin installation compartment not only facilitates electrical connection but also saves installation space on the drill collar; The oil seal is convenient for oil filling and vacuuming; The base body is detachably connected to the drill collar, which facilitates the removal of the base body; and the first threaded hole provided on the surface allows for easy removal using a hammer. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic diagram of an ultrasonic sensor according to an embodiment of the present invention; Figure 2 For the Figure 1 Schematic diagram of the ultrasonic sensor from a different angle; Figure 3 is a cross-sectional view of an ultrasonic sensor according to an embodiment of the present invention; Figure 4 A top view of a substrate according to an embodiment of the present invention; Figure 5 A bottom view of a base body according to an embodiment of the present invention; Figure 6 is a cross-sectional view of a substrate according to an embodiment of the present invention; Figure 7 is a schematic diagram of a first cover plate according to an embodiment of the present invention; Figure 8 is a schematic diagram of a second cover plate according to an embodiment of the present invention; Figure 9 is a schematic diagram of a third cover plate according to an embodiment of the present invention; Figure 10 Schematic diagram of a logging while drilling instrument according to an embodiment of the present invention; Figure 11 4 is a cross-sectional view of a logging while drilling instrument according to an embodiment of the present invention. DETAILED DESCRIPTION

[0013] In order to better understand the purpose, structure and function of the present invention, an ultrasonic sensor of the present invention is further described in detail below with reference to the accompanying drawings.

[0014] like Figure 1 、 Figure 2 and Figure 3 As shown, an ultrasonic sensor according to an embodiment of the present invention is shown, comprising a base body 1 detachably connected to a drill collar of a logging while drilling instrument, the base body 1 being provided with a closed pressure balance chamber and an ultrasonic probe mounting chamber, the pressure balance chamber being injected with pressure oil for balancing mud pressure, an ultrasonic probe 10 being limitedly provided in the ultrasonic probe mounting chamber, and the pressure balance chamber and the ultrasonic probe mounting chamber being connected via an oil passage connecting hole 703; a pressure-bearing pin mounting compartment isolated from mud being provided on the base body 1, a pressure-bearing pin 16 being limitedly provided in the pressure-bearing pin mounting compartment, the ultrasonic probe mounting chamber and the pressure-bearing pin mounting compartment being connected via a wire hole 109, a wire connecting the ultrasonic probe 10 and the pressure-bearing pin 16 being provided in the wire hole 109, and the pressure oil in the pressure balance chamber can enter the pressure-bearing pin mounting compartment through the ultrasonic probe mounting chamber and the wire hole 109.

[0015] The ultrasonic sensor of the embodiment of the present invention includes a base 1, which is detachably connected to the drill collar of the logging while drilling instrument, thereby facilitating the removal of the ultrasonic sensor; pressure oil for balancing mud pressure is injected into the pressure balance chamber on the base 1, and the pressure balance chamber and the ultrasonic probe installation chamber are connected through the oil circuit connecting hole 703, thereby ensuring the pressure balance of the internal system of the ultrasonic sensor under high temperature and high pressure environment and improving the service life of the ultrasonic probe 10; the pressure-bearing pin 16 is integrated into the base 1, thereby facilitating the electrical connection between the pressure-bearing pin and the ultrasonic probe 10 and saving installation space on the drill collar.

[0016] Regarding the base body 1 and the drill collar, both ends of the base body 1 are provided with first threaded holes 101. The base body 1 is detachably connected to the drill collar via first screws 2 disposed within the first threaded holes 101. The base body 1 also has a second threaded hole 115, into which a second screw 18 is connected. The provision of the second screw 18 not only increases the preload force of the first screw 2 but also facilitates the removal of the base body 1 from the drill collar of the logging while drilling instrument.

[0017] Among them, such as Figure 3 、 Figure 6 As shown, a first protrusion is provided on the base body 1 near the drill collar side, and the first protrusion is fixedly connected to the second cover plate 7, and a second cover plate sealing ring 9 is provided between the second cover plate 7 and the first protrusion; a pressure balance chamber 104 is provided on the first protrusion and passes through the base body 1, and a first cover plate groove 102 is provided on the base body 1 away from the drill collar side, the pressure balance chamber 104 is located in the first cover plate groove 102, and the pressure balance chamber 104 is located in the second cover plate sealing ring 9; a rubber pad 5 and a first cover plate 3 are provided in the first cover plate groove 102, the first cover plate 3 is fixedly connected to the base body 1 by fasteners, and the rubber pad 5 is provided between the first cover plate 3 and the base body 1; the pressure balance chamber is a cavity between the second cover plate 7, the pressure balance chamber 104 and the rubber pad 5, and the first cover plate 3 is provided with a mud through hole 302 that enables mud to act on the rubber pad 5.

[0018] The first cover plate serves to fix the rubber pad 5 , which is fixed between the first cover plate 3 and the base body 1 to serve as pressure compensation.

[0019] When implementing it specifically, Figure 4 As shown, a third threaded hole 103 is provided on the first protrusion; Figure 7 As shown, the first cover plate is provided with a first cover plate countersunk hole 301; the third threaded hole 103 and the first cover plate countersunk hole 301 are connected by a third screw 4. Figure 8 As shown, the second cover plate 7 is provided with a second cover plate countersunk hole 702; Figure 5 As shown, a fourth threaded hole 106 is provided on the base 1 , and the second cover plate countersunk hole 702 and the fourth threaded hole 106 are connected by a fourth screw 8 .

[0020] like Figure 6 As shown, a second cover plate sealing groove 105 is provided on the side of the first protrusion close to the drill collar, and a second cover plate sealing ring 9 for sealing the base 1 and the second cover plate 7 is provided in the second cover plate sealing groove 105; the provision of the rubber pad 5 between the first cover plate and the base 1, on the one hand, serves the purpose of sealing the first cover plate and the base 1, and on the other hand, the pressure of the external mud can act on the rubber pad 5 through the mud through hole 302; the aforementioned closed pressure balance chamber is the cavity formed by the rubber pad, the side wall of the pressure balance chamber 104 and the second cover plate 7.

[0021] like Figure 8 As shown, an oil injection hole 701 for injecting pressurized oil into the pressure balance chamber is provided on the second cover plate 7 corresponding to the pressure balance chamber 104. The oil injection hole 701 is connected to the oil seal 6. The provision of the oil injection hole 701 and the oil seal 6 facilitates oil injection and vacuuming of the closed pressure balance chamber.

[0022] After the oil filling is completed, the oil seal 6 is screwed into the oil filling hole 701 to seal the pressure balance chamber 104 .

[0023] Again, as Figure 6 As shown, an ultrasonic probe mounting chamber 107 is provided on the first protrusion and passes through the base 1. The ultrasonic probe mounting chamber 107 is located in the second cover plate sealing ring 9. A shrinking ring is provided on the side of the ultrasonic probe mounting chamber 107 away from the drill collar. The ultrasonic probe 10 is limited between the shrinking ring and the second cover plate 7. An ultrasonic probe sealing ring 11 is provided between the ultrasonic probe mounting chamber 107 and the ultrasonic probe 10. The ultrasonic probe mounting cavity is the cavity between the ultrasonic probe mounting chamber 107, the ultrasonic probe sealing ring, the ultrasonic probe 10 and the second cover plate 7.

[0024] During specific implementation, an ultrasonic probe sealing groove 108 is provided in the ultrasonic probe installation chamber 107 , and the ultrasonic probe sealing ring 11 between the ultrasonic probe installation chamber 107 and the ultrasonic probe 10 is provided in the ultrasonic probe sealing groove 108 .

[0025] The ultrasonic probe mounting compartment 107 is located within the second cover plate sealing ring 9, and the pressure balance compartment 104 is also located within the second cover plate sealing ring 9. Therefore, the second cover plate sealing ring 9 simultaneously seals one end of the ultrasonic probe mounting compartment 107 and one end of the pressure balance compartment 104. The enclosed ultrasonic probe mounting cavity is the cavity between the ultrasonic probe mounting compartment 107, the ultrasonic probe sealing ring, the ultrasonic probe, and the second cover plate 7. The ultrasonic probe is placed within the ultrasonic probe mounting compartment 107 and is restrained in place by a shrinking ring and the second cover plate 7.

[0026] Among them, such as Figure 8 As shown, the oil circuit communication hole 703 is provided on one side of the second cover plate 7 close to the pressure balance chamber 104 , and the oil circuit communication hole 703 is located inside the second cover plate sealing ring 9 .

[0027] Among them, a second protrusion is provided on the base body 1 near the drill collar side, and the pressure pin installation chamber 113 is provided on the second protrusion and passes through the base body 1, as shown in FIG. Figure 6 As shown, a limiting step is provided on the side wall of the pressure-bearing pin installation chamber 113, a retaining spring 15 is connected inside the pressure-bearing pin installation chamber, and the pressure-bearing pin 16 is limited between the limiting step and the retaining spring.

[0028] Specifically, such as Figure 6As shown, a retaining spring groove 112 is provided on the side wall of the pressure-bearing pin installation chamber 113, and a retaining spring 15 is disposed in the retaining spring groove; the pressure-bearing pin 16 is restrained between the limiting step and the retaining spring 15. The retaining spring 15 is used to limit the position of the pressure-bearing pin 16, thereby ensuring the reliability of the electrical connection.

[0029] Among them, such as Figure 3 As shown, a third cover plate groove 110 is provided on the base body 1 on the side away from the drill collar, and a third cover plate 12 is provided in the third cover plate groove. The third cover plate 12 is fixedly connected to the base body 1 by fasteners. A third cover plate sealing ring 14 is provided between the third cover plate 12 and the base body 1, and a pressure-bearing pin sealing ring 17 is provided between the base body 1 and the drill collar. The pressure-bearing pin mounting chamber 113 is located in the third cover plate sealing ring 14, and the pressure-bearing pin mounting chamber 113 is located in the pressure-bearing pin sealing ring 17. The pressure-bearing pin 16 is isolated from the mud by the third cover plate sealing ring 14 and the pressure-bearing pin sealing ring 17.

[0030] Specifically, such as Figure 9 As shown, a third cover plate sealing groove 1202 is provided on the third cover plate 12, and a third cover plate sealing ring 14 between the third cover plate 12 and the base body 1 is provided in the third cover plate sealing groove 1202; Figure 9 As shown, the third cover plate 12 is provided with a third cover plate threaded hole 1201, and the base body 1 is provided with a fifth threaded hole 111. The third cover plate threaded hole 1201 and the fifth threaded hole 111 are connected by a fifth screw 13. The second protrusion is provided with a pressure-bearing pin sealing groove 114. The base body 1 and the drill collar are sealed by a pressure-bearing pin sealing ring 17 disposed in the pressure-bearing pin sealing groove 114.

[0031] The embodiment of the present invention adopts a rubber balance form and pressure oil as a sealing medium, which ensures the pressure balance inside the ultrasonic sensor under high temperature and high pressure environment and improves the service life of the ultrasonic probe; the pressure-bearing pins of the electrical components are integrated into the pressure-bearing pin installation compartment, which can facilitate electrical connection and save installation space on the drill collar; the oil seal provided can facilitate oil filling and vacuuming; the threaded holes provided on the surface of the ultrasonic probe base 1 can be easily disassembled using a hammer.

[0032] The embodiment of the present invention also provides a logging while drilling instrument, such as Figure 10 、 Figure 11 As shown, it includes a drill collar 01, and the drill collar 01 is provided with an ultrasonic sensor 02 according to any one of the above embodiments.

[0033] When the logging while drilling instrument of this embodiment is used, ultrasonic probes are used to transmit and receive ultrasonic waves in a drilling environment, and then a wellbore wall image is formed according to the arrival time and amplitude of the echo of the received ultrasonic waves.

[0034] It should be noted that, unless otherwise specified, the technical or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0035] In addition, the terms "one", "two", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the present invention, the meaning of "multiple" is more than two, unless otherwise clearly and specifically limited.

[0036] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An ultrasonic sensor, characterized in that: The utility model comprises a base body detachably connected to a drill collar of a logging while drilling instrument, wherein the base body is provided with a closed pressure balance chamber and an ultrasonic probe mounting chamber, wherein pressure oil for balancing mud pressure is injected into the pressure balance chamber, an ultrasonic probe is limitedly provided in the ultrasonic probe mounting chamber, and the pressure balance chamber and the ultrasonic probe mounting chamber are connected via an oil passage communication hole; a pressure-bearing pin mounting chamber isolated from mud is provided on the base body, a pressure-bearing pin is limitedly provided in the pressure-bearing pin mounting chamber, the ultrasonic probe mounting chamber and the pressure-bearing pin mounting chamber are connected via a wire hole, a wire connecting the ultrasonic probe and the pressure-bearing pin is provided in the wire hole, and the pressure oil in the pressure balance chamber can enter the pressure-bearing pin mounting chamber via the ultrasonic probe mounting chamber and the wire hole; A first protrusion is provided on the base body near the drill collar side, and the first protrusion is fixedly connected to a second cover plate, and a second cover plate sealing ring is provided between the second cover plate and the first protrusion; a pressure balance chamber is provided on the first protrusion and penetrates the base body, and a first cover plate groove is provided on the base body away from the drill collar side, a rubber pad and a first cover plate are provided in the first cover plate groove, the first cover plate is fixedly connected to the base body by fasteners, the rubber pad is provided between the first cover plate and the base body, the pressure balance chamber is located in the first cover plate groove, and the pressure balance chamber is located in the second cover plate sealing ring; the pressure balance chamber is a cavity between the second cover plate, the pressure balance chamber and the rubber pad, and the first cover plate is provided with a mud through hole that enables mud to act on the rubber pad.

2. The ultrasonic sensor according to claim 1, wherein: An oil filling hole for injecting pressure oil into the pressure balance cavity is provided on the second cover plate at a position corresponding to the pressure balance chamber, and the oil filling hole is connected to an oil seal.

3. The ultrasonic sensor according to claim 1, wherein The second cover plate is fixed to the first protrusion of the base through a fastener. A second cover plate sealing groove is provided on the first protrusion, and the second cover plate sealing ring is provided in the second cover plate sealing groove.

4. The ultrasonic sensor according to claim 1, wherein An ultrasonic probe mounting compartment is provided on the first protrusion and passes through the base body. The ultrasonic probe mounting compartment is located in the sealing ring of the second cover plate. A shrinking ring is provided on the side of the ultrasonic probe mounting compartment away from the drill collar. The ultrasonic probe is limited between the shrinking ring and the second cover plate. An ultrasonic probe sealing ring is provided between the ultrasonic probe mounting compartment and the ultrasonic probe. The ultrasonic probe mounting cavity is a cavity between the ultrasonic probe mounting compartment, the ultrasonic probe sealing ring, the ultrasonic probe and the second cover plate.

5. The ultrasonic sensor according to claim 4, characterized in that The oil circuit communication hole is provided on a side of the second cover plate close to the pressure balance chamber, and the oil circuit communication hole is located inside the sealing ring of the second cover plate.

6. The ultrasonic sensor according to any one of claims 1, characterized in that A second protrusion is provided on the base body near the side of the drill collar, the pressure-bearing pin mounting chamber is provided on the second protrusion and passes through the base body, a limiting step is provided on the side wall of the pressure-bearing pin mounting chamber, a retaining spring is connected in the pressure-bearing pin mounting chamber, and the pressure-bearing pin is limited between the limiting step and the retaining spring.

7. The ultrasonic sensor according to claim 1, wherein A third cover plate groove is provided on the base body on the side away from the drill collar, a third cover plate is provided in the third cover plate groove, the third cover plate is fixedly connected to the base body by fasteners, a third cover plate sealing ring is provided between the third cover plate and the base body, a pressure-bearing pin sealing ring is provided between the base body and the drill collar, the pressure-bearing pin mounting compartment is located in the third cover plate sealing ring, the pressure-bearing pin mounting compartment is located in the pressure-bearing pin sealing ring, and the pressure-bearing pin is isolated from mud by the third cover plate sealing ring and the pressure-bearing pin sealing ring.

8. The ultrasonic sensor according to claim 1, wherein Both ends of the base are provided with a first threaded hole, and the base is detachably connected to the drill collar through a first screw provided in the first threaded hole; the base is also provided with a second threaded hole, and a second screw is connected in the second threaded hole.

9. A logging while drilling instrument, characterized in that: It comprises a drill collar, on which the ultrasonic sensor according to any one of claims 1 to 8 is arranged.

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