Sound insulator short section applied to dipole sound waves

Abstract

A sound insulator short section applied to dipole sound waves comprises more than two sound insulation pipes, a plurality of notch grooves penetrating through the interiors and the exteriors of the sound insulation pipes are formed in the outer walls of the sound insulation pipes, a connecting pipe is arranged between every two adjacent sound insulation pipes, and the two ends of each connecting pipe are embedded into the inner walls of the sound insulation pipes on the two sides of the connecting pipe respectively. The sound insulation pipe and the connecting pipe are connected together through more than three spraying clamping blocks arranged in the circumferential direction of the sound insulation pipe. According to the sound insulator pup joint disclosed by the invention, through the special grooving form of the sound insulation pipe, in combination with the PEEK spraying technology and selection of non-metallic materials, the sound wave propagation path is prolonged, and meanwhile, different media are alternately used to achieve the effect of attenuating the amplitude of a direct wave signal, so that the sound insulation effect is achieved.

Description

Technical Field

[0001] The invention belongs to the field of petroleum logging, and particularly relates to a sound insulation short section used in dipole array acoustic logging in the field, which can be used between array acoustic wave emission and reception to delay the arrival time of acoustic waves in a wide frequency range and eliminate direct waves. Background Art

[0002] Orthogonal dipole array acoustic logging has become the mainstream instrument for acoustic logging. When the dipole acoustic wave is working, the sound source excites a sound wave that propagates along the instrument casing. If no sound insulation treatment is performed, it will dominate the measurement signal, thereby interfering with the measurement of formation wave velocity.

[0003] Existing sound insulation short section forms such as Figure 1 , 2, the connecting ring 21 and the center block 22 are mostly connected by a cylindrical pin 23, and a rubber tube or a bellows is used inside. The center block is divided into cylindrical and square.

[0004] At present, most of the wells are horizontal, and most of them are constructed by direct push of drilling tools. When logging in the horizontal section, the sound insulation of this form is relatively soft, which poses risks during construction. At the same time, when the axial force is too large, the cylindrical pin will be sheared and damaged, and there is a risk of sound insulation fracture. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a sound insulation short section which is applied to dipole acoustic wave logging and can effectively insulate sound while ensuring the overall rigidity of the instrument.

[0006] The present invention adopts the following technical solution: A sound insulation body short section used for dipole sound waves, the improvement of which is as follows: it comprises more than two sound insulation pipes, a plurality of grooves penetrating inside and outside the sound insulation pipes are arranged on the outer walls of the sound insulation pipes, a connecting pipe is arranged between adjacent sound insulation pipes, two ends of the connecting pipe are respectively embedded in the inner walls of the sound insulation pipes on both sides thereof, the sound insulation pipes and the connecting pipes are connected together by more than three spraying clamps arranged along the circumference of the sound insulation pipes, PEEK material is sprayed on the contact surfaces of the spraying clamps and the connecting pipes respectively, so that the two form an integral part, a metal bellows is arranged inside the sound insulation pipes and the connecting pipes, a PEEK pad and a polyimide pad are arranged between the ends of adjacent sound insulation pipes, and a nylon ring is arranged between the sound insulation pipe and its adjacent connecting pipe.

[0007] Furthermore, the groove is a cutting line that runs through the inside and outside of the sound insulation tube.

[0008] Furthermore, an empty pipe is arranged between two adjacent sound insulation pipes in the middle of the short section, two left and right sliding rings are sleeved on the empty pipe, and more than three leaf springs are arranged between the two sliding rings.

[0009] Furthermore, the interior of the metal bellows is filled with silicone oil.

[0010] Furthermore, a balancing cylinder is arranged at one end of the short section, and a plunger is arranged on the balancing cylinder.

[0011] Furthermore, the balancing cylinder is connected to the protective cap through an upper joint.

[0012] Furthermore, the sound insulation pipe at the other end of the short section is connected to the plug through a lower joint.

[0013] The beneficial effects of the present invention are: The sound insulation short section disclosed in the present invention, through the special groove form of the sound insulation pipe, combined with PEEK spraying technology and the selection of non-metallic materials, can extend the sound wave propagation path while alternately using different media to achieve the effect of attenuating the amplitude of the direct wave signal, thereby achieving a sound insulation effect. The wave shape on the surface of the bellows also has a significant effect on delaying the direct wave. The self-centering function is achieved by the cooperation of the sliding ring and the leaf spring. When used in an instrument string, signal interference caused by eccentricity of the transmitting window and the receiving window can be avoided. Compared with traditional sound insulation short sections, it has good overall rigidity, does not bend, is convenient for drilling tools to transport instruments, and is more suitable for direct-push construction technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of an existing sound insulation short section; Figure 2 It is a schematic diagram of the connection form of the existing sound insulation short section; Figure 3 It is a structural schematic diagram of the short section of the sound insulation body disclosed in the present invention; Figure 4 It is a schematic diagram of the main structure of the sound insulation tube in the sound insulation short section disclosed in the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the sound insulation tube in the sound insulation short section disclosed in the present invention; Figure 6 It is a schematic diagram of the connection form of the short section of the sound insulation body disclosed in the present invention.

[0015] Reference numerals: 1-protective cap; 2-plug; 3-upper joint; 4-balance cylinder; 5-plunger; 6-spraying block; 7-sound insulation tube; 8-sliding ring; 9-leaf spring; 10-lower joint; 11-bellows; 12-connecting pipe, 13-PEEK pad; 14-polyimide pad; 15-nylon ring. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0017] Embodiment 1, this embodiment discloses a short section of a sound insulator applied to dipole sound waves, such as Figure 3 As shown, it includes four sound insulation pipes 7, which are made by wire cutting of integral steel pipes. Figure 4 As shown in FIG5 , a plurality of grooves are provided on the outer wall of the soundproof tube, which penetrate the inside and outside of the soundproof tube. The grooves are cutting lines which penetrate the inside and outside of the soundproof tube through the center of the circle. This unique groove form not only ensures the overall rigidity of the instrument, but also prolongs the path of the acoustic signal propagating along the metal shell. After the oil-water mixture enters the groove, the alternating change of the medium has a more obvious attenuation effect on the acoustic signal on the outer surface of the instrument.

[0018] like Figure 6 As shown, a connecting pipe 12 is arranged between adjacent soundproof pipes, and the two ends of the connecting pipe are respectively embedded in the inner wall of the soundproof pipe on both sides thereof, and the soundproof pipe and the connecting pipe are connected together by four spraying blocks 6 arranged along the circumference of the soundproof pipe, and PEEK material is sprayed on the contact surface of the spraying block and the connecting pipe, so that the PEEK material forms an integral part with the spraying block and the connecting pipe. Specifically, under high temperature, PEEK material is sprayed on the bottom surface and four side surfaces where the spraying block contacts the connecting pipe, as well as on the outer wall of the connecting pipe, and a metal bellows 11 for routing and protecting the internal wiring harness is arranged inside the soundproof pipe and the connecting pipe, and the metal bellows is filled with silicone oil, and the wave shape on the surface of the bellows also has a significant effect on delaying direct waves. A PEEK pad 13 and a polyimide pad 14 are arranged between the ends of adjacent sound insulation tubes, and a nylon ring 15 is arranged between the sound insulation tube and its adjacent connecting tube. By utilizing the different propagation speeds of sound waves in different media, the effect of attenuating the signal amplitude is achieved by alternately using different media.

[0019] A section of empty pipe is arranged between two adjacent soundproof pipes in the middle of the short section, and two left and right sliding rings 8 are mounted on the empty pipe. The sliding rings can slide in both directions along the empty pipe. Six leaf springs 9 are arranged between the two sliding rings, and the two sliding rings can be easily disassembled and replaced. The leaf springs play a supporting and straightening role underground, and can be used to center the instrument in the wellbore, avoid signal difference caused by eccentricity between the transmitting probe and the receiving probe, and ensure the logging quality.

[0020] A balance cylinder 4 is provided at one end of the short section, and a plunger 5 for balancing the internal and external pressures is provided on the balance cylinder. The balance cylinder is connected to the protective cap 1 through the upper joint 3. The soundproof pipe at the other end of the short section is connected to the plug 2 through the lower joint 10.

Claims

1. A sound insulation short section used for dipole sound waves, characterized by: The invention comprises two or more soundproofing tubes, wherein a plurality of grooves penetrating inside and outside the soundproofing tubes are arranged on the outer walls of the soundproofing tubes, a connecting tube is arranged between adjacent soundproofing tubes, and the two ends of the connecting tube are respectively embedded in the inner walls of the soundproofing tubes on both sides thereof, the soundproofing tubes and the connecting tubes are connected together by three or more spraying blocks arranged along the circumference of the soundproofing tubes, and PEEK material is sprayed on the contact surfaces of the spraying blocks and the connecting tubes respectively, a metal corrugated tube is arranged inside the soundproofing tubes and the connecting tubes, a PEEK pad and a polyimide pad are arranged between the ends of adjacent soundproofing tubes, and a nylon ring is arranged between the soundproofing tube and its adjacent connecting tubes.

2. The sound insulator short section for dipole sound waves according to claim 1, characterized in that: The groove is a cutting line that runs through the inside and outside of the sound insulation tube.

3. The sound insulator short section for dipole sound waves according to claim 1, characterized in that: A section of empty pipe is arranged between two adjacent sound insulation pipes in the middle of the short section, two left and right sliding rings are sleeved on the empty pipe, and more than three leaf springs are arranged between the two sliding rings.

4. The sound insulator short section for dipole sound waves according to claim 1, characterized in that: The inside of the metal bellows is filled with silicone oil.

5. The sound insulator short section for dipole sound waves according to claim 1, characterized in that: A balancing cylinder is arranged at one end of the short section, and a plunger is arranged on the balancing cylinder.

6. The sound insulator short section for dipole sound waves according to claim 5, characterized in that: The balance cylinder is connected with the protective cap through an upper joint.

7. The sound insulator short section for dipole sound waves according to claim 5, characterized in that: The sound insulation pipe at the other end of the short section is connected to the plug through the lower joint.

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