A maze-type grooved structure sound insulation body device and construction method

Abstract

The present invention relates to a maze grooving structure sound insulation body device and a construction method, and relates to the technical field of acoustic logging. It includes a sound insulation body, and the sound insulation body specifically includes a grooving structure arranged on the non-local resonance type acoustic metamaterial surface of the drill collar body. A receiver is arranged on the outer surface above the drill collar body, and an annular monopole sound source is arranged on the outer surface below the drill collar body; the grooving structure is axially provided with no less than 5 grooving groups on the body, and each single grooving group is provided with no less than 10 circumferential grooves. The sound insulation body performs grooving operations through a mode matrix, and the size of the mode matrix is not less than 5×10. A simulation experiment is carried out by simulating the actual environment of acoustic logging while drilling. The maze grooving structure sound insulation body designed based on the acoustic metamaterial surface can effectively attenuate the drill collar wave at the wide and low-frequency center frequencies compared with the traditional periodic circumferential grooving form sound insulation body, and at the same time, the extraction of formation signals can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of acoustic logging, and in particular to a maze grooving structure sound insulation body device and a construction method thereof. Background Art

[0002] Acoustic logging is one of the important technical means for oil exploration and development. Compared with traditional wireline acoustic logging, logging-while-drilling acoustic logging has many advantages such as real-time drilling, guiding the drilling direction, and being used in highly deviated wells, horizontal wells, and offshore drilling platforms. However, during the monopole logging-while-drilling process, the drill collar wave signal will mask the formation compressional and shear wave signals and even interfere with the Stoneley wave signal. Therefore, effectively suppressing the drill collar wave is one of the key technical difficulties in improving the detection effect of logging-while-drilling acoustic logging.

[0003] Scholars have achieved effective suppression of the drill collar wave by adding a section of sound insulation body between the drill collar transmitter and the receiver, and have conducted a large number of studies on the periodic circumferential grooving type sound insulation body and continuously improved and optimized it. However, the applicable frequency range of this grooving form is relatively narrow and high, and it can attenuate the drill collar wave within a relatively narrow range of about 20 kHz of the source center frequency, and the influence of fluid and formation in the actual drilling environment is not considered when designing the sound insulation body.

[0004] Therefore, a maze grooving structure sound insulation body device and a construction method are provided to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a maze grooving structure sound insulation body device and a construction method, to solve the problems that the applicable attenuation frequency of the existing logging-while-drilling acoustic logging sound insulation body is too high, and the influence of fluid and formation in the actual logging-while-drilling acoustic logging environment is not considered when measuring the sound insulation performance of the sound insulation body, and to achieve effective attenuation of the drill collar wave at wide and low-frequency source center frequencies. After adding the maze grooving structure sound insulation body, the extraction of formation information can be realized.

[0006] To achieve the above purpose, the present invention provides a maze grooving structure sound insulation body device, including a sound insulation body, and the sound insulation body specifically includes a grooving structure provided on the non-local resonance type acoustic metamaterial surface of the drill collar body. A receiver is provided on the outer surface above the drill collar body, and a ring monopole sound source is provided on the outer surface below the drill collar body; the grooving structure has no less than 5 grooving groups arranged axially on the drill collar body, and each single grooving group has no less than 10 circumferential grooves.

[0007] A construction method of a maze grooving structure sound insulation body device includes the following steps:

[0008] Step S1: Determine the number m of axial grooving groups and the number n of circumferential grooves in each grooving group;

[0009] Step S2: Randomly generate a pattern matrix a of size m×n with elements being 0 or 1;

[0010] Step S3: Perform grooving operations on the outer wall of the drill collar body according to the pattern matrix a.

[0011] Preferably, in Step S3, it specifically includes the following steps:

[0012] S31: Divide the drill collar body into m segments along the axial direction;

[0013] S32: Sequentially select the grooving group planes of the 1st, 2nd, 3rd, ···, mth segments, and equally divide the current plane into n parts;

[0014] S33: If the corresponding element of the pattern matrix is 1, perform grooving operations; if the corresponding element of the pattern matrix is 0, do not perform grooving operations.

[0015] Preferably, the grooving operation is a random operation based on the randomly generated pattern matrix, and any circumferential grooving structure combination relationship is included within the scope of the random grooving operation.

[0016] Preferably, the width of the axial grooving group is determined by dividing the length of the sound insulation body by the number of grooving groups, and the width of the circumferential grooving is determined by dividing the outer circumference of the body by the number of circumferential grooves. When the length of the sound insulation body is 1 meter, when the number of axial grooving groups is m, the width of the axial grooving group is 1 / m meter; when the number of circumferential grooves is n, its outer and inner widths are respectively the outer and inner circumferences of the body divided by n, and the grooving depth is 10 - 30 mm.

[0017] Therefore, the present invention adopts the above-mentioned maze-type grooving structure sound insulation body device and construction method, conducts simulation experiments by simulating the actual environment of logging-while-drilling acoustic logging. Compared with the traditional periodic circumferential grooving form sound insulation body, it can effectively attenuate the drill collar wave at wide and low-frequency center frequencies and extract formation signals.

[0018] The technical solution of the present invention will be further described in detail below through the drawings and embodiments. Description of the Drawings

[0019] Figure 1 is a three-dimensional model diagram of a maze-type grooving structure sound insulation body with a ten-segment grooving group in an embodiment of the present invention;

[0020] Figure 2 is a two-dimensional plan view of the grooving plane when constructing a single grooving group of a maze-type grooving structure sound insulation body device of the present invention;

[0021] Figure 3 is a three-dimensional finite element model diagram of the acoustic attenuation curve of a maze-type grooving structure sound insulation body device during logging-while-drilling in an embodiment of the present invention;

[0022] Figure 4Frequency-domain sound attenuation curve graph of the construction method of a labyrinth grooving structure sound insulation body device in Embodiment 1 of the present invention;

[0023] Figure 5 Time-domain waveform comparison graph of Embodiment 1 of the present invention and a smooth drill collar for acoustic logging while drilling from 0 to 4 ms;

[0024] Figure 6 Full-wave array time-slowness correlation extraction graph of acoustic logging while drilling in Embodiment 1 of the present invention;

[0025] Figure 7 Sound attenuation curve comparison graph of different circumferential grooving numbers of the same number of grooving groups in Embodiment of the present invention;

[0026] Figure 8 Sound attenuation curve comparison graph of the same circumferential grooving number of different numbers of grooving groups in Embodiment of the present invention;

[0027] Figure 9 Time-domain waveform comparison graph of Embodiment 3 of the present invention and a smooth drill collar for acoustic logging while drilling from 0 to 4 ms;

[0028] Reference numerals

[0029] 1. Receiver; 2. Sound insulation body; 3. Monopole sound source; 4. Drill collar body. Detailed implementation manners

[0030] The technical solutions of the present invention will be further described below with reference to the drawings and embodiments.

[0031] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the ordinary meanings understood by those of ordinary skill in the field to which the present invention belongs.

[0032] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the gist or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention, and any reference numerals in the claims should not be regarded as limiting the claims involved.

[0033] All terms used in this disclosure (including technical or scientific terms) have the same meaning as understood by those of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary should be construed to have a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense, unless specifically defined as such herein.

[0034] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the specification.

[0035] Embodiment

[0036] The present invention provides a maze-grooved structure sound insulation body device, including a sound insulation body 2. Specifically, the sound insulation body 2 includes a grooved structure provided on the non-local resonance type acoustic metamaterial surface of the drill collar body 4. A receiver 1 is provided on the outer surface above the drill collar body 4, and an annular monopole sound source 3 is provided on the outer surface below the drill collar body 4. The grooved structure is axially provided with no less than 5 grooved groups on the drill collar body 4, and each single grooved group is provided with no less than 10 circumferential grooves.

[0037] A construction method of a maze-grooved structure sound insulation body device includes the following steps:

[0038] Step S1: Determine the number m of axial grooved groups and the number n of circumferential grooves in each grooved group;

[0039] Step S2: Randomly generate a pattern matrix a of size m×n with elements being 0 or 1;

[0040] Step S3: Perform grooving operations on the outer wall of the drill collar body according to the pattern matrix a.

[0041] In step S3, it specifically includes the following steps:

[0042] S31: Divide the drill collar body into m segments along the axial direction;

[0043] S32: Select the grooved group planes of the 1st, 2nd, 3rd, ···, mth segments one by one, and equally divide the current plane into n parts;

[0044] S33: If the corresponding element of the pattern matrix is 1, perform grooving operations; if the corresponding element of the pattern matrix is 0, do not perform grooving operations. The grooving operation is a random operation based on the randomly generated pattern matrix, and any circumferential grooved structure combination relationship is included within the range of the random grooving operation.

[0045] The inner diameter of the drill collar body is set to 30 mm, and the outer diameter is set to 88 mm. There are at least 5 grooved groups arranged outside the drill collar body; each grooved group is formed by stretching a randomly generated grooved plane, with the circumferential number of grooves being 10 - 40, and the groove depth being 10 - 30 mm.

[0046] Since the actual logging - while - drilling acoustic logging is carried out in a fluid - filled wellbore, the influence of the fluid inside the well, the fluid outside the well, and the formation environment outside the well on the acoustic measurement results cannot be ignored. Therefore, the finite - element model should consider the influence of the fluid and the formation. In this solution, a three - dimensional finite - element model is used to restore the actual measurement environment of the logging - while - drilling acoustic logging, and a ring - shaped sound source and an array of receivers are set to maximize the true characterization of the sound insulation effect of the sound - insulating body.

[0047] Example 1

[0048] The three - dimensional model of a sound - insulating body with a labyrinth - type grooved structure composed of 10 grooved groups is as Figure 1 shown. Each grooved group is 100 mm, and the total length of the sound - insulating body is 1000 mm. When constructing each grooved group, first select the grooved plane of this section, as Figure 2 shown. The inner circle in the plane is equally divided into 40 parts, and the corresponding angle of each part is 9°. Each part is represented by an element, that is, represented by 0 and 1. Among them, 0 indicates that grooving operation is performed on this part, which is air; 1 indicates that grooving operation is not performed on this part, which is steel.

[0049] Therefore, the entire grooved structure can be represented as a pattern matrix a of size 10×40. Each pattern matrix corresponds to a labyrinth - type grooved configuration. And since each pattern matrix has 400 elements, and each element has two cases of 0 and 1, there are a total of 2 400 types of grooved structures. Arbitrarily select one of the pattern matrices a (1) as the specific implementation data of this example.

[0050] The attenuation coefficient is calculated to measure the performance of the sound - insulating body. The attenuation coefficient represents the sound attenuation amount before and after passing through the sound - insulating body. Among them, u out is the radial displacement at the far receiving point, and u in is the radial displacement at the near receiving point. The calculation of the attenuation coefficient considers the influence of the fluid and the formation, and a Figure 3 finite - element calculation model is used, with the transmitter and the receiver spaced 4 m apart. The results are as Figure 4 shown.

[0051] The performance of the sound - insulating body can also be measured by calculating the radial stress waveform in the time domain. The radial stress waveform of the logging - while - drilling acoustic logging from 0 to 4 ms after adding Example 1 is calculated using a monopole sound source with a central frequency of 10 kHz and compared with the radial stress waveform under a smooth drill collar. The results are as Figure 5As shown. The time-slowness correlation calculation is a key evaluation method for distinguishing whether the longitudinal and transverse wave velocities of the formation can be effectively extracted after adding the sound insulation body. The slowness-correlation extraction diagram of the full-wave array of the logging-while-drilling acoustic logging after adding the sound insulation body in Example 1 is as Figure 6 shown.

[0052] Carry out horizontal experimental comparisons of seven embodiments to comprehensively consider the sound insulation effect and mechanical properties, and optimize the number of axial and circumferential grooves.

[0053] Example 2: The inner diameter of the sound insulation body is 30 mm, the outer diameter is 88 mm, 10 groove groups are used, the grooving plane of each groove group is equally divided into 30 parts, and the corresponding angle of each part is 12°. A pattern matrix of size 10×30 is randomly generated, and grooving operations are carried out according to the pattern matrix, and the grooving depth is 15 mm.

[0054] Example 3: The inner diameter of the sound insulation body is 30 mm, the outer diameter is 88 mm, 10 groove groups are used, the grooving plane of each groove group is equally divided into 20 parts, and the corresponding angle of each part is 18°. A pattern matrix of size 10×20 is randomly generated, and grooving operations are carried out according to the pattern matrix, and the grooving depth is 15 mm.

[0055] Example 4: The inner diameter of the sound insulation body is 30 mm, the outer diameter is 88 mm, 10 groove groups are used, the grooving plane of each groove group is equally divided into 10 parts, and the corresponding angle of each part is 36°. A pattern matrix of size 10×10 is randomly generated, and grooving operations are carried out according to the pattern matrix, and the grooving depth is 15 mm.

[0056] Example 5: The inner diameter of the sound insulation body is 30 mm, the outer diameter is 88 mm, 5 groove groups are used, the grooving plane of each groove group is equally divided into 20 parts, and the corresponding angle of each part is 18°. A pattern matrix of size 5×20 is randomly generated, and grooving operations are carried out according to the pattern matrix, and the grooving depth is 15 mm.

[0057] Example 6: The inner diameter of the sound insulation body is 30 mm, the outer diameter is 88 mm, 15 groove groups are used, the grooving plane of each groove group is equally divided into 20 parts, and the corresponding angle of each part is 18°. A pattern matrix of size 15×20 is randomly generated, and grooving operations are carried out according to the pattern matrix, and the grooving depth is 15 mm.

[0058] Example 7: The inner diameter of the sound insulation body is 30 mm, the outer diameter is 88 mm, 20 groove groups are used, the grooving plane of each groove group is equally divided into 20 parts, and the corresponding angle of each part is 18°. A pattern matrix of size 20×20 is randomly generated, and grooving operations are carried out according to the pattern matrix, and the grooving depth is 15 mm.

[0059] Simulate the acoustic attenuation coefficient curves of the logging-while-drilling acoustic logging for Examples 1 to 4, and the frequency-domain comparison results are as Figure 6As shown in the figure. The simulated acoustic attenuation coefficient curves of Example 1, Example 5 to Example 7 during logging while drilling are compared in the frequency domain, and the results are as Figure 7 shown.

[0060] According to Figure 7 , Figure 8 the comparison results of the attenuation curves, comprehensively considering the attenuation coefficient and mechanical properties of the sound insulation body, the number of grooved groups can be preferably 10, and the number of circumferential grooves is 20 as the sound insulation body parameters, that is, Example 3. The time-domain waveforms from 0 to 2 ms are calculated at a center frequency of 10 kHz for the case of adding Example 3 and a smooth drill collar respectively as Figure 9 shown.

[0061] Therefore, by adopting the above-mentioned maze-type grooved structure sound insulation body device and construction method, the present invention can consider the influence of fluids and formations in actual acoustic logging, can effectively attenuate the drill collar wave at wide and low-frequency sound source center frequencies, and successfully extract formation signals.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A labyrinth-type grooved structure sound insulation device, characterized in that: The invention comprises a sound insulator, which specifically comprises a groove structure arranged on the non-local resonance acoustic metasurface of the drill collar body, a receiver is arranged on the outer surface above the drill collar body, the interval between the receiver and the transmitter is set to 4m, and an annular monopole sound source is arranged on the outer surface below the drill collar body; the groove structure is arranged with no less than 5 groove groups along the axial direction on the drill collar body, and no less than 10 circumferential grooves are arranged on a single groove group; The inner diameter of the sound insulator is 30mm, the outer diameter is 88mm, and a 10-segment groove group is used. The groove plane of the groove group is divided into 20 equal parts, and the corresponding angle of each part is 18°. A pattern matrix of 10×20 is randomly generated, and the groove operation is performed according to the pattern matrix. The groove depth is 15mm; The method for constructing the labyrinth-type groove structure sound insulation device comprises the following steps: Step S1: determining the number m of groove groups along the axial direction and the number n of grooves in each groove group along the circumferential direction; Step S2: randomly generate a pattern matrix a of size m×n, with elements being 0 or 1; Step S3: performing a groove operation on the outer wall of the drill collar body according to the pattern matrix a; S31: dividing the drill collar body into m segments along the axial direction; S32: Select the 1st, 2nd, 3rd, ..., mth segment groove group planes at a time, and divide the current plane into n equal parts; S33: If the element corresponding to the pattern matrix is ​​1, a notching operation is performed; if the element corresponding to the pattern matrix is ​​0, no notching operation is performed; The performance of the sound insulator is measured by calculating the attenuation coefficient and the time-domain radial stress waveform.

2. A method for constructing a labyrinth-type grooved structure sound insulation device, characterized in that: The following steps are involved: Step S1: determining the number m of groove groups along the axial direction and the number n of grooves in each groove group along the circumferential direction; Step S2: randomly generate a pattern matrix a of size m×n, with elements being 0 or 1; Step S3: performing a groove operation on the outer wall of the drill collar body according to the pattern matrix a; S31: dividing the drill collar body into m segments along the axial direction; S32: Select the 1st, 2nd, 3rd, ..., mth segment groove group planes at a time, and divide the current plane into n equal parts; S33: If the element corresponding to the pattern matrix is ​​1, a notching operation is performed; if the element corresponding to the pattern matrix is ​​0, no notching operation is performed; The performance of the sound insulator is measured by calculating the attenuation coefficient and the radial stress waveform in the time domain; Attenuation coefficient Represents the sound attenuation before and after passing through the sound insulator; in, is the radial displacement at the far receiving point, is the radial displacement near the receiving point; the attenuation coefficient is calculated by taking into account the influence of fluid and formation at the same time; The 0-4ms radial stress waveform of the LWD acoustic logging with a monopole sound source at a center frequency of 10kHz is compared with the radial stress waveform under the smooth drill collar. The time-slowness correlation calculation is used to determine whether the formation P- and S-wave velocities can be extracted after adding the sound insulator.

3. The method for constructing a labyrinth-type groove structure sound insulator device according to claim 2, characterized in that: The notching operation is a random operation based on a randomly generated pattern matrix, and any combination relationship of circumferential notching structures is included in the range of the random notching operation.

4. The method for constructing a labyrinth-type groove structure sound insulator device according to claim 2, characterized in that: The width of the axial groove group is determined by dividing the length of the sound insulator by the number of groove groups, and the width of the circumferential groove is determined by dividing the outer circumference of the body by the number of circumferential grooves. If the length of the sound insulator is 1 meter, then when the number of axial groove groups is m, the width of the axial groove group is 1 / m meters; when the number of circumferential grooves is n, the outer and inner widths are respectively the outer and inner circumferences of the body divided by n, and the groove depth is 10~30mm; The inner diameter of the sound insulator body is 30mm, and the outer diameter is 88mm. A 10-segment groove group is used, and the groove plane of the groove group is divided into 20 equal parts. The corresponding angle of each part is 18°. A pattern matrix of 10×20 is randomly generated, and the groove operation is performed according to the pattern matrix. The groove depth is 15mm.

Images