CN115628040A - Acoustic system structure of large-size borehole acoustic logging instrument and logging method - Google Patents
Acoustic system structure of large-size borehole acoustic logging instrument and logging method Download PDFInfo
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- CN115628040A CN115628040A CN202211179699.3A CN202211179699A CN115628040A CN 115628040 A CN115628040 A CN 115628040A CN 202211179699 A CN202211179699 A CN 202211179699A CN 115628040 A CN115628040 A CN 115628040A
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000000523 sample Substances 0.000 claims abstract description 160
- 238000009413 insulation Methods 0.000 claims description 71
- 230000000712 assembly Effects 0.000 claims description 16
- 238000000429 assembly Methods 0.000 claims description 16
- 230000001681 protective effect Effects 0.000 claims description 7
- 239000002775 capsule Substances 0.000 claims description 6
- 239000004568 cement Substances 0.000 abstract description 6
- 238000007789 sealing Methods 0.000 description 10
- 239000012212 insulator Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B47/14—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/40—Seismology; Seismic or acoustic prospecting or detecting specially adapted for well-logging
- G01V1/44—Seismology; Seismic or acoustic prospecting or detecting specially adapted for well-logging using generators and receivers in the same well
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Abstract
The invention discloses a large-size borehole acoustic logging instrument acoustic system structure and a logging method, which relate to the field of acoustic logging and comprise a slotted shell and an acoustic system core arranged in the slotted shell, wherein a transmitting probe, a first receiving probe, a second receiving probe, a third receiving probe, a fourth receiving probe, a fifth receiving probe and a sixth receiving probe are arranged in the acoustic system core from far to near; the transmitting probes are matched with the receiving probes to realize large-size cased well acoustic amplitude variable density logging or open hole acoustic velocity logging. The invention can not only carry out acoustic amplitude variable density well logging in a large-size cased well (13.625 inches-20 inches) and provide cement bond quality information, but also measure depth-lapse borehole compensation high resolution time difference and common interval acoustic time difference in open hole acoustic velocity well logging.
Description
Technical Field
The invention relates to the field of acoustic logging, in particular to a large-size borehole acoustic logging instrument acoustic system structure and a logging method.
Background
At present, in the geophysical and oil-gas exploration and development processes, acoustic logging is used as one of the main methods, and the geological profile of a drilled well and the cementing quality are researched by utilizing the difference of acoustic characteristics such as the propagation speed, amplitude, frequency change and the like of acoustic waves in different rocks. In addition, part of sound wave energy is converted into energy in other forms (mainly heat energy) due to friction, viscosity, heat conduction and the like in a medium, and the energy is also attenuated, wherein the absorption coefficients of the viscosity and the heat conduction are in direct proportion to the square of the frequency of the sound wave, so that the attenuation of a sound signal generated by a transmitting probe is increased rapidly along with the increase of the size of a borehole during logging, and the conventional sound wave logging instrument cannot meet the logging requirement of the borehole with a large size.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a large-size borehole acoustic logging instrument acoustic system structure and a logging method, which can perform acoustic amplitude variable density logging in a large-size cased well (13.625-20 inches) and provide cement bond quality information, and can also measure depth-lapse borehole compensation high-resolution time difference and common interval acoustic time difference in open hole acoustic logging.
The purpose of the invention is completed by the following technical scheme: the acoustic system structure of the large-size borehole acoustic logging instrument comprises a grooving shell and an acoustic system core arranged in the grooving shell, wherein a transmitting probe, and a first receiving probe, a second receiving probe, a third receiving probe, a fourth receiving probe, a fifth receiving probe and a sixth receiving probe which are sequentially arranged from far to near with the transmitting probe are arranged in the acoustic system core; the transmitting probe is selectively matched with each receiving probe, so that large-size cased hole acoustic amplitude variable density logging or open hole acoustic velocity logging is realized.
As a further technical scheme, the front end of the acoustic system core is provided with an upper joint, the rear end of the acoustic system core is provided with a transmitting probe and a lower joint, the front end of the transmitting probe is provided with a transmitting upper joint, and the upper joint and the transmitting upper joint are connected and sealed through a capsule; and the rear end of the emission probe is provided with an emission lower joint for connecting the lower joint.
As a further technical scheme, a front socket assembly is arranged in the upper connector, the front socket assembly is connected with a sound insulation assembly through the upper connector, five groups of receiving transducer assemblies are sequentially connected behind the upper sound insulation assembly, and adjacent receiving transducer assemblies are connected through the sound insulation assembly; the rear parts of the five groups of receiving transducer components are connected with one group of receiving transducer components through one group of long sound insulation rubber components, the rear parts of the single groups of receiving transducer components are connected with the lower sound insulation component through a plurality of groups of short sound insulation rubber components, and the lower sound insulation component is connected to the upper transmitting joint through the lower connecting joint.
As a further technical scheme, the front socket assembly comprises a 31-core adapter sleeve, a 37-core pressure-bearing disc and a 37-core socket, the 37-core pressure-bearing disc is fixed in the upper joint by a retainer ring, the front end of the 37-core pressure-bearing disc is connected with the 31-core adapter sleeve, the rear end of the 37-core pressure-bearing disc is connected with the 37-core socket, the 37-core socket is fixed on the upper joint by screws, and the upper sound-insulating assembly is fixed on the upper joint by screws; the long sound insulation rubber component comprises a long connecting shaft and a long sound insulation rubber rod sleeved on the long connecting shaft, and sound insulation components are arranged at two ends of the long sound insulation rubber component; the short sound-proof rubber components comprise short connecting shafts and short sound-proof rubber rods sleeved on the short connecting shafts, the short sound-proof rubber components are three groups in total, and adjacent short sound-proof rubber components are connected in sequence through sound-proof components.
As a further technical scheme, the rear end of the upper transmitting joint is fixed on the lower transmitting joint through a screw, a sound insulation sheet is arranged at the joint of the upper transmitting joint and the lower transmitting joint, a middle insulation seat is sleeved in the middle of the upper transmitting joint, two sides of the middle insulation seat are respectively provided with one transmitting transducer, and the outer side of each transmitting transducer is hermetically arranged on one insulation seat through a sealing ring A and a sealing ring B.
As a further technical scheme, an insulating seat close to the upper launching connector is pressed on the inner wall of the upper launching connector through a sound insulation rubber sheet A, and an insulating seat close to the lower launching connector is axially locked on the upper launching connector through a sound insulation rubber sheet B and a locking nut; a sound-transmitting cover is installed between the outer wall of the upper transmitting joint and the outer wall of the lower transmitting joint, a transformer assembly is fixed on the lower transmitting joint through threads, a transformer assembly shell is arranged on the transformer assembly shell, and the transformer shell is connected between the lower transmitting joint and the lower joint.
As a further technical scheme, the lower joint is fixed at the rear end of the grooved shell through a positioning screw B and a threaded ring A, one end of the lower pipe shell is fixed on the lower joint through the threaded ring B, and the other end of the lower pipe shell is provided with a protective plug; the rear end of the lower joint is provided with a 32-core socket through a bushing, and the 32-core socket is used for connecting a 32-core pressure bearing disc fixed in the lower pipe shell; the lower emission joint is fixed and positioned on the grooved shell through a fixing screw.
As a further technical scheme, the upper joint is fixed and positioned at the front end of the grooved shell through a positioning screw A, a protective cap is sleeved at the front end of the upper joint and is fixed on the outer wall of the upper joint through an open ring gasket, an open ring and a threaded ring C, and the threaded ring C is tightly pressed at the front end opening part of the grooved shell through an end fixing ring and a left end ring and a right end ring.
As a further technical solution, the distance between the first receiving probe and the transmitting probe is 7 feet, the distance between the second receiving probe and the transmitting probe is 6.5 feet, the distance between the third receiving probe and the transmitting probe is 6 feet, the distance between the fourth receiving probe and the transmitting probe is 5.5 feet, the distance between the fifth receiving probe and the transmitting probe is 5 feet, and the distance between the sixth receiving probe and the transmitting probe is 3 feet.
The logging method adopting the acoustic system structure of the large-size borehole acoustic logging instrument comprises the following steps:
1) selecting a logging mode according to the type of a borehole to be tested, carrying out step 2) by adopting sonic logging for an open hole well, and carrying out step 3) by adopting acoustic amplitude variable density logging for a large-size cased well;
2) Selecting a transmitting probe, a first receiving probe, a second receiving probe, a third receiving probe, a fourth receiving probe and a fifth receiving probe to form a single-transmitting five-receiving mode, measuring depth-lapse borehole compensation high-resolution longitudinal wave time difference and common interval acoustic longitudinal wave time difference, and inverting the porosity of the stratum through the longitudinal wave time difference;
3) Judging the borehole size of a large-size cased well, and executing the step 4) when the borehole size is between 13.625 inches and 16 inches, executing the step 5) when the borehole size is between 16 inches and 18 inches, and executing the step 6) when the borehole size is between 18 inches and 20 inches;
4) A transmitting probe, a sixth receiving probe and a fifth receiving probe are adopted to form a single-transmitting and double-receiving mode, and acoustic amplitude CBL and variable density VDL signals of corresponding boreholes are respectively detected;
5) A transmitting probe, a sixth receiving probe and a third receiving probe are adopted to form a single-transmitting and double-receiving mode, and acoustic amplitude CBL and variable density VDL signals of corresponding boreholes are respectively detected;
6) And a single-transmitting and double-receiving mode is formed by the transmitting probe, the sixth receiving probe and the first receiving probe, and the sound amplitude CBL and the variable density VDL signals of the corresponding well bore are respectively detected.
The beneficial effects of the invention are as follows:
1. five groups of long source distance receiving probes, one group of short source distance receiving probes and transmitting probes which are arranged at equal intervals form a single-transmitting and six-receiving mode, through the combination of different receiving probes and different transmitting probes, acoustic amplitude variable density logging can be carried out in the range of 13.625-20 inches of well bores, acoustic velocity logging can be carried out at the same time, depth-lapse well bore compensation high resolution time difference and common interval acoustic time difference are measured in a naked eye well, and the defect that the conventional instrument cannot carry out logging in large-size well bores is overcome;
2. the acoustic system core is sealed and installed by adopting the capsule, the sealing and pressure resistance performance is good, the maximum outer diameter of the acoustic system is phi 118mm, and the acoustic system core can work in the environment of 150 ℃ high temperature and 110MPa underground.
Drawings
FIG. 1 is a schematic view of the present invention.
Fig. 2 is a structural sectional view of the present invention.
Fig. 3 is a partially enlarged view of the area a in fig. 2.
Fig. 4 is a partially enlarged view of the region B in fig. 2.
Fig. 5 is a schematic structural view of the acoustic system core of the present invention.
FIG. 6 is an enlarged partial schematic view of the upper joint part of FIG. 5.
FIG. 7 is an enlarged partial schematic view of the five-group receive transducer assembly of FIG. 5.
FIG. 8 is an enlarged partial schematic view of the long acoustic rubber assembly of FIG. 5 with a single set of receiving transducer assemblies.
Fig. 9 is a partially enlarged schematic view of the short acoustic rubber member of fig. 5.
Fig. 10 is a partially enlarged view of the lower joint portion in fig. 5.
Description of reference numerals: the sound insulation device comprises a first receiving probe R0, a second receiving probe R1, a third receiving probe R2, a fourth receiving probe R3, a fifth receiving probe R4, a sixth receiving probe R5, a transmitting probe T, an upper joint 1, a 31-core adapter sleeve 2, a 37-core bearing disc 3, a 37-core socket 4, an upper joint 5, an upper sound insulation component 6, a screw 7, a receiving transducer component 8, a sound insulation component 9, a capsule 10, a long sound insulation rubber rod 11, a long connecting shaft 12, a short sound insulation rubber 13, a short connecting shaft 14, a lower sound insulation component 15, a transmitting upper joint 16, a rubber sheet A17, an insulation seat 18, a sealing ring A19, a sealing ring B20, a transmitting transducer 21, a middle insulation seat 22, a rubber sheet B23, a locking nut 24, a sound insulation sheet 25, a transmitting lower joint 26, a transformer case 27, a transformer case 28, a lower joint 29, a threaded ring A30, a threaded ring B31, a bushing 32, a 32-core socket 33, a sound-transmitting cover 34, a cap 35, a sound insulation pad 36, an open ring 37, a threaded ring C38, a left-closed ring 38, a right-threaded ring 38, a fixed ring 40, a fixed shell, a fixed screw shell 39, a fixed end ring 40, a fixed screw, a lower end ring 45, a fixed screw, a fixed ring 45, a fixed ring 46, a positioning plug, a positioning screw, a 46, a lower positioning plug 46, a positioning plug, a lower positioning plug 48, a and a positioning plug 46.
Detailed Description
The invention will be described in detail below with reference to the following drawings:
example (b): as shown in fig. 1 to 10, the acoustic system structure of the large-sized borehole acoustic logging instrument includes a first receiving probe R0, a second receiving probe R1, a third receiving probe R2, a fourth receiving probe R3, a fifth receiving probe R4, a sixth receiving probe R5, a transmitting probe T, an upper joint 1, a 31-core adapter sleeve 2, a 37-core bearing plate 3, a 37-core socket 4, an upper adapter 5, an upper sound insulation assembly 6, a screw 7, a receiving transducer assembly 8, a sound insulation assembly 9, a capsule 10, a long sound insulation rubber rod 11, a long connecting shaft 12, a short sound insulation rubber 13, a short connecting shaft 14, a lower sound insulation assembly 15, a transmitting upper joint 16, a sound insulation rubber sheet a17, an insulation seat 18, a sealing ring a19, a sealing ring B20, a transmitting transducer 21, a middle insulation seat 22, a sound insulation rubber sheet B23, a locking nut 24, a sound insulation sheet 25, a transmitting lower joint 26, a transformer assembly 27, a transformer assembly 28, a lower joint 29, a threaded ring a bushing 30, a threaded ring B31, a core socket 32, a core socket 33, a bearing ring B34, an open-ring cover 34, an open-loop cover 34, a positioning screw, a positioning cap, a positioning screw 44, a positioning cap, a positioning plug 45, a positioning cap 48, a positioning plug 45, a positioning plug 40, a positioning plug 48, a positioning plug, a positioning cap and a positioning plug 40.
Referring to fig. 2, 3 and 4, the acoustic system core 42 is disposed in the housing 43, and the transmitting probe T, and the first receiving probe R0, the second receiving probe R1, the third receiving probe R2, the fourth receiving probe R3, the fifth receiving probe R4 and the sixth receiving probe R5 are disposed in the acoustic system core 42 in sequence from far to near. Preferably, the distance between the first receiving probe R0 and the transmitting probe T is 7 feet, the distance between the second receiving probe R1 and the transmitting probe T is 6.5 feet, the distance between the third receiving probe R2 and the transmitting probe T is 6 feet, the distance between the fourth receiving probe R3 and the transmitting probe T is 5.5 feet, the distance between the fifth receiving probe R4 and the transmitting probe T is 5 feet, and the distance between the sixth receiving probe R5 and the transmitting probe T is 3 feet.
Furthermore, an upper joint 1 is arranged at the front end of the acoustic system core 42, a transmitting probe T and a lower joint 29 are arranged at the rear end of the acoustic system core 42, a transmitting upper joint 16 is arranged at the front end of the transmitting probe T, and the upper joint 1 and the transmitting upper joint 16 are connected and sealed through a capsule 10, so that the sealing and pressure-resistant performance is ensured. The rear end of the emission probe T is provided with an emission lower connector 26, and the emission lower connector 26 is connected with a lower connector 29 through a transformer tube shell 27.
As shown in fig. 5 and 6, a front socket assembly is arranged in the upper joint 1, the front socket assembly comprises a 31-core adapter sleeve 2, a 37-core bearing disc 3 and a 37-core socket 4, the 37-core bearing disc 3 is fixed in the upper joint 1 by a retainer ring, the 31-core adapter sleeve 2 is connected at the front end of the 37-core bearing disc 3, the 37-core socket 4 is connected at the rear end of the 37-core bearing disc 3, the 37-core socket 4 is in threaded connection at the front end of the upper joint 5, and the rear end of the upper joint 5 is provided with a sound insulation assembly 6 through a screw 7.
Referring to fig. 7, five groups of receiving transducer assemblies 8 are arranged at the rear end of the upper sound insulation assembly 6 at equal intervals, and respectively correspond to the first receiving probe R0, the second receiving probe R1, the third receiving probe R2, the fourth receiving probe R3 and the fifth receiving probe R4, and the adjacent receiving transducer assemblies 8 are spaced by 0.5 feet and are connected with each other through a sound insulation assembly 9. As shown in fig. 8, after the rear ends of five groups of receiving transducer assemblies 8 are insulated by a group of long sound insulation rubber assemblies, a group of receiving transducer assemblies 8 (corresponding to a sixth receiving probe R5) are connected by a sound insulation assembly 9, referring to fig. 9, a lower sound insulation assembly 15 is connected behind the single group of receiving transducer assemblies 8 (sixth receiving probe R5) by three groups of short sound insulation rubber assemblies, and the lower sound insulation assembly 15 is connected to a transmitting upper joint 16 by a lower joint 49. Further, as shown in fig. 8 and 9, the long soundproof rubber component comprises a long connecting shaft 12 and a long soundproof rubber rod 11 sleeved on the long connecting shaft 12, and both ends of the long soundproof rubber component are provided with soundproof components 9; the short sound insulation rubber components comprise three groups of short sound insulation rubber rods 13 sleeved on the short connecting shafts 14, and adjacent short sound insulation rubber components are connected in sequence through sound insulation components 9.
Referring to fig. 10, the rear end of the upper transmitting joint 16 is fixed to a lower transmitting joint 26 by screws, a sound insulation sheet 25 is arranged at the joint of the upper transmitting joint and the lower transmitting joint, a middle insulation seat 22 is sleeved on the middle of the upper transmitting joint 16, two transmitting transducers 21 are respectively installed on two sides of the middle insulation seat 22, and the outer side of each transmitting transducer 21 is hermetically installed on one insulation seat 18 through a sealing ring a19 and a sealing ring B20 to form a transmitting probe T. Further, the insulator 18 (i.e., the left insulator 18 in fig. 10) adjacent to the launching upper connector 16 is pressed against the inner wall of the launching upper connector 16 by the soundproof rubber pieces a17, and the insulator 18 (i.e., the right insulator 18 in fig. 10) adjacent to the launching lower connector 26 is axially locked to the launching upper connector 16 by the soundproof rubber pieces B23 and the lock nut 24. A sound-transmitting cover 34 is arranged between the outer wall of the launching upper joint 16 and the outer wall of the launching lower joint 26, a transformer assembly 28 is fixedly arranged on the launching lower joint 26 through threads, a transformer tube shell 27 is arranged on the outer cover of the transformer assembly 28, and the transformer tube shell 27 is connected between the launching lower joint 26 and the lower joint 29 to seal and protect the transformer assembly 28.
As shown in fig. 2, 4 and 10, the lower joint 29 is fixed at the rear end of the grooved outer shell 43 through a positioning screw B45 and a threaded ring a30, the left end of the lower casing 46 is fixed on the lower joint 29 through a threaded ring B31, and the right end of the lower casing 46 is provided with a protection plug 48 to seal and protect the whole logging instrument. The lower shell 46 is fixedly provided with a 32-core bearing disc 47, the rear end of the lower connector 29 is provided with a 32-core socket 33 through a bush 32, and the 32-core socket 33 is used for connecting the 32-core bearing disc 47. The firing sub 26 is fixed and positioned on the chamfered housing 43 by a set screw 44.
Referring to fig. 3, the upper joint 1 is fixed and positioned at the front end of the grooved outer shell 43 by a positioning screw a41, a protective cap 35 is sleeved at the front end of the upper joint 1, the protective cap 35 is fixed on the outer wall of the upper joint 1 by an open ring pad 36, an open ring 37 and a threaded ring C38, and the threaded ring C38 is pressed on the front end opening of the grooved outer shell 43 by a fixed ring 39 and left and right end rings 40.
The logging method adopting the acoustic system structure of the large-size borehole acoustic logging instrument comprises the following steps:
1) selecting a logging mode according to the type of a borehole to be tested, carrying out step 2) for open hole logging by adopting sound velocity, carrying out step 3) for large-size cased hole logging by adopting sound amplitude variable density;
2) Selecting a transmitting probe T, a first receiving probe R0, a second receiving probe R1, a third receiving probe R2, a fourth receiving probe R3 and a fifth receiving probe R4 to form a single-transmitting five-receiving mode, measuring depth-lapse borehole compensation high-resolution longitudinal wave time difference and common-spacing sound wave longitudinal wave time difference, and inverting the porosity of the stratum through the longitudinal wave time difference;
3) Judging the borehole size of a large-size cased well, and executing the step 4) when the borehole size is between 13.625 inches and 16 inches, executing the step 5) when the borehole size is between 16 inches and 18 inches, and executing the step 6) when the borehole size is between 18 inches and 20 inches;
4) Adopting a transmitting probe T, a sixth receiving probe R5 and a fifth receiving probe R4 to form a single-transmitting and double-receiving mode, and respectively detecting acoustic amplitude CBL and variable density VDL signals of a corresponding well hole (CBL is a curve reflecting the change of head wave amplitude of a first interface casing along with depth, and after calibrating the head wave amplitude in a free casing, calculating the attenuation rate of the head wave amplitude actually measured in the cement cementation casing according to the curve to obtain the cementation index of the first interface; VDL is the intensity curve of stoneley wave, which can be qualitatively analyzed to reflect the quality of the second interface bond);
5) A transmitting probe T, a sixth receiving probe R5 and a third receiving probe R2 are adopted to form a single-transmitting and double-receiving mode, and acoustic amplitude CBL and variable density VDL signals of corresponding boreholes are respectively detected;
6) The transmitting probe T, the sixth receiving probe R5 and the first receiving probe R0 are adopted to form a single-transmitting and double-receiving mode, and acoustic amplitude CBL and variable density VDL signals of corresponding boreholes are respectively detected.
The working principle of the invention is as follows:
the acoustic logging instrument is used for checking the cementing condition of cement and a casing after well cementation, the conventional acoustic logging instrument generally adopts a single-transmitting and double-receiving working mode, short-source distance acoustic receiving signals are used for acoustic amplitude measurement, and the cement cementing quality of a first interface is quantitatively analyzed; and the long-source-distance sound wave receiving signal is used for measuring the variable density, and the cement bond quality of the second interface is quantitatively analyzed. However, the conventional acoustic logging tool has only two receiving probes, and the size of the borehole to which the conventional acoustic logging tool is adapted is small. The invention adopts the combination of the single-transmitting six-receiving probe, and can adapt to the 13.625-20 inch well by adjusting the combination of the receiving probes and changing the source distance. Meanwhile, a single-transmitting five-receiving array can be formed by adopting receiving probes and transmitting probes which are 5 feet, 5.5 feet, 6 feet, 6.5 feet and 7 feet away from the transmitting probe, the depth-lapse borehole compensated high-resolution time difference and the common interval acoustic time difference are measured, and the porosity of the stratum is inverted through longitudinal wave time difference. And the acoustic velocity logging of the open hole well is realized.
It should be understood that equivalent substitutions and changes to the technical solution and the inventive concept of the present invention should be made by those skilled in the art to the protection scope of the appended claims.
Claims (10)
1. A jumbo size borehole acoustic logger acoustic system structure which characterized in that: the acoustic system comprises a groove shell (43) and an acoustic system core (42) installed in the groove shell (43), wherein a transmitting probe (T) and a first receiving probe (R0), a second receiving probe (R1), a third receiving probe (R2), a fourth receiving probe (R3), a fifth receiving probe (R4) and a sixth receiving probe (R5) which are sequentially arranged from far to near with the transmitting probe (T) are arranged in the acoustic system core (42); the transmitting probe (T) is selectively matched with each receiving probe to realize large-size cased well acoustic amplitude variable density logging or open hole acoustic velocity logging.
2. The large-scale borehole acoustic tool acoustic structure of claim 1, wherein: the front end of the acoustic system core (42) is provided with an upper joint (1), the rear end of the acoustic system core (42) is provided with a transmitting probe (T) and a lower joint (29), the front end of the transmitting probe (T) is provided with a transmitting upper joint (16), and the upper joint (1) and the transmitting upper joint (16) are connected and sealed through a capsule (10); the rear end of the emission probe (T) is provided with an emission lower joint (26) which is used for connecting a lower joint (29).
3. The large-scale borehole acoustic tool acoustic structure of claim 2, wherein: a front socket assembly is arranged in the upper connector (1), the front socket assembly is connected with an upper sound insulation assembly (6) through an upper connector (5), five groups of receiving transducer assemblies (8) are sequentially connected behind the upper sound insulation assembly (6), and adjacent receiving transducer assemblies (8) are connected through a sound insulation assembly (9); the rear parts of the five groups of receiving transducer assemblies (8) are connected with one group of receiving transducer assemblies (8) through one group of long sound insulation rubber assembly, the rear parts of the single group of receiving transducer assemblies (8) are connected with the lower sound insulation assembly (15) through a plurality of groups of short sound insulation rubber assemblies, and the lower sound insulation assembly (15) is connected to the upper transmitting joint (16) through the lower connecting joint (49).
4. The large-scale acoustic tool architecture of claim 3, wherein: the front socket assembly comprises a 31-core adapter sleeve (2), a 37-core bearing disc (3) and a 37-core socket (4), the 37-core bearing disc (3) is fixed in the upper connector (1) through a check ring, the front end of the 37-core bearing disc (3) is connected with the 31-core adapter sleeve (2), the rear end of the 37-core bearing disc (3) is connected with the 37-core socket (4), the 37-core socket (4) is fixed on the upper connector (5), and the upper sound insulation assembly (6) is fixed on the upper connector (5); the long sound insulation rubber component comprises a long connecting shaft (12) and a long sound insulation rubber rod (11) sleeved on the long connecting shaft (12), and sound insulation components (9) are arranged at two ends of the long sound insulation rubber component; the short sound-proof rubber components comprise three groups of short connecting shafts (14) and short sound-proof rubber rods (13) sleeved on the short connecting shafts (14), and adjacent short sound-proof rubber components are sequentially connected through sound-proof components (9).
5. The large-scale borehole acoustic tool acoustic structure of claim 4, wherein: the rear end of the transmitting upper joint (16) is fixed on the transmitting lower joint (26), a sound insulation sheet (25) is arranged at the joint of the transmitting upper joint and the transmitting lower joint, a middle insulation seat (22) is sleeved at the middle part of the transmitting upper joint (16), two transmitting transducers (21) are respectively arranged on two sides of the middle insulation seat (22), and the outer side of each transmitting transducer (21) is hermetically arranged on one insulation seat (18).
6. The large-scale borehole acoustic tool acoustic structure of claim 4, wherein: an insulating seat (18) close to the launching upper joint (16) is pressed on the inner wall of the launching upper joint (16) through a sound insulation rubber sheet A (17), and the insulating seat (18) close to the launching lower joint (26) is axially locked on the launching upper joint (16) through a sound insulation rubber sheet B (23) and a locking nut (24); a sound-transmitting cover (34) is installed between the outer wall of the launching upper connector (16) and the outer wall of the launching lower connector (26), a transformer assembly (28) is fixed on the launching lower connector (26), a transformer tube shell (27) is arranged outside the transformer assembly (28), and the transformer tube shell (27) is connected between the launching lower connector (26) and the lower connector (29).
7. The large-scale acoustic tool architecture of claim 6, wherein: the lower joint (29) is fixed at the rear end of the engraved outer shell (43), one end of the lower pipe shell (46) is fixed on the lower joint (29), and the other end of the lower pipe shell (46) is provided with a protective plug (48); the rear end of the lower joint (29) is provided with a 32-core socket (33) through a bushing (32), and the 32-core socket (33) is used for connecting a 32-core pressure bearing disc (47) fixed in the lower pipe shell (46); the lower emission joint (26) is fixed and positioned on the engraved shell (43).
8. The large-scale borehole acoustic tool acoustic structure of claim 7, wherein: the upper joint (1) is fixed and positioned at the front end of the grooved shell (43), the front end of the upper joint (1) is sleeved with a protective cap (35), and the protective cap (35) is fixed on the outer wall of the upper joint (1).
9. The large-scale borehole acoustic tool acoustic structure of claim 8, wherein: the distance between the first receiving probe (R0) and the transmitting probe (T) is 7 feet, the distance between the second receiving probe (R1) and the transmitting probe (T) is 6.5 feet, the distance between the third receiving probe (R2) and the transmitting probe (T) is 6 feet, the distance between the fourth receiving probe (R3) and the transmitting probe (T) is 5.5 feet, the distance between the fifth receiving probe (R4) and the transmitting probe (T) is 5 feet, and the distance between the sixth receiving probe (R5) and the transmitting probe (T) is 3 feet.
10. A logging method using the acoustic system structure of the large-size borehole acoustic tool according to any of claims 1 to 9, characterized in that: the method comprises the following steps:
1) selecting a logging mode according to the type of a borehole to be tested, carrying out step 2) for open hole logging by adopting sound velocity, carrying out step 3) for large-size cased hole logging by adopting sound amplitude variable density;
2) Selecting a transmitting probe (T), a first receiving probe (R0), a second receiving probe (R1), a third receiving probe (R2), a fourth receiving probe (R3) and a fifth receiving probe (R4) to form a single-transmitting five-receiving mode, measuring depth-lapse borehole compensation high-resolution longitudinal wave time difference and common interval acoustic wave longitudinal wave time difference, and inverting the porosity of the stratum through the longitudinal wave time difference;
3) Judging the borehole size of a large-size cased well, and executing the step 4) when the borehole size is between 13.625 inches and 16 inches, executing the step 5) when the borehole size is between 16 inches and 18 inches, and executing the step 6) when the borehole size is between 18 inches and 20 inches;
4) A transmitting probe (T), a sixth receiving probe (R5) and a fifth receiving probe (R4) are adopted to form a single-transmitting and double-receiving mode, and acoustic amplitude CBL and variable density VDL signals of corresponding boreholes are respectively detected;
5) A transmitting probe (T), a sixth receiving probe (R5) and a third receiving probe (R2) are adopted to form a single-transmitting and double-receiving mode, and acoustic amplitude CBL and variable density VDL signals of corresponding boreholes are respectively detected;
6) A single-transmitting double-receiving mode is formed by the transmitting probe (T), the sixth receiving probe (R5) and the first receiving probe (R0), and the sound amplitude CBL and the variable density VDL signals of the corresponding well bores are detected respectively.
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