CN114876448A - Method and device for positioning and detecting leakage point of shaft - Google Patents

Abstract

The invention discloses a method and a device for wellbore leak point location detection. The method includes performing leak point location detection through a location detection device in the wellbore, wherein the location detection device includes an axial ultrasonic detection mechanism and a circumferential ultrasonic detection mechanism The axial ultrasonic testing mechanism includes a first fixed rod, an axial ultrasonic generator and an axial ultrasonic receiver; the circumferential ultrasonic testing mechanism includes a second fixed rod, a circumferential ultrasonic generator and a circumferential ultrasonic receiver. The beneficial effects of the invention are as follows: the propagation time of the ultrasonic signal between the axial ultrasonic generator and the axial ultrasonic receiver is detected, and the distribution of the flow rate of the drilling fluid in the axial direction of the wellbore is obtained, so as to obtain the depth of lost circulation, and at the same time , to detect the propagation time of the ultrasonic signal between the circumferential ultrasonic generator and the circumferential ultrasonic receiver, the difference in the flow rate of the drilling fluid in all directions can be obtained, so as to obtain the circumferential azimuth of the lost circulation, so as to block the leakage point .

Description

A method and device for location detection of wellbore leak point

technical field

The invention relates to the technical field of well leakage detection, in particular to a method and device for location detection of wellbore leakage points.

Background technique

Drilling is an important part of oil and natural gas exploitation. In order to ensure efficient and safe drilling and prevent lost circulation and blowout, it is necessary to use mud with certain bonding properties as drilling fluid during the drilling process. Due to the complexity of the underground formation structure, fractures and porous formations are often encountered, resulting in mud leakage. After the occurrence of mud leakage, the most important thing is to find the location of the leakage as quickly and accurately as possible, so as to plug the leakage point.

In the prior art, by fixing the ultrasonic transmitter and the ultrasonic receiver on the drill pipe along the axial direction of the drill pipe, during the movement of the drill pipe, the ultrasonic transmitter and the ultrasonic receiver are used to continuously measure the ultrasonic wave between the two. The propagation time can be calculated to obtain the flow rate of the drilling fluid. The depth position where the flow rate suddenly increases is the depth position where the lost circulation occurs.

However, this method can only obtain the depth position where the lost circulation occurs, but cannot obtain the circumferential position where the lost circulation occurs (ie, the azimuth of the position where the lost circulation occurs), which is not conducive to the rapid treatment of lost circulation.

SUMMARY OF THE INVENTION

In view of this, it is necessary to provide a method and device for wellbore leak point location detection, in order to solve the problem that the existing wellbore leak point location detection method can only obtain the depth position of the wellbore leakage occurrence, but cannot obtain the circumference of the wellbore leakage occurrence. To the location, it is not conducive to the rapid treatment of lost circulation technical problems.

In order to achieve the above object, the present invention provides a method for wellbore leak point location detection, comprising: performing leak point location detection by a location detection device in the wellbore, wherein the location detection device includes an axial ultrasonic detection mechanism and a Circumferential ultrasonic testing institutions;

The axial ultrasonic detection mechanism includes a first fixed rod, an axial ultrasonic generator and an axial ultrasonic receiver, and the axial ultrasonic generator and the axial ultrasonic receiver are both fixed to the first fixed rod, The axial ultrasonic generator and the axial ultrasonic receiver are oppositely arranged, and the connecting line between the two is parallel to the first fixing rod;

The circumferential ultrasonic detection mechanism includes a second fixed rod, a circumferential ultrasonic generator and a circumferential ultrasonic receiver, the second fixed rod is coaxially and fixedly connected to the first fixed rod, and the circumferential ultrasonic generator is And the circumferential ultrasonic receiver is fixed on the second fixed rod, the circumferential ultrasonic generator and the circumferential ultrasonic receiver are oppositely arranged, and the connecting line of the two intersects with the second fixed rod .

In some embodiments, the axial ultrasonic detection mechanism further includes a first position adjusting member, the first position adjusting member is a first micro cylinder, and a cylinder body of the first micro cylinder is fixed to the first fixing member a rod, and the output shaft of the first micro cylinder is fixedly connected with the axial ultrasonic generator.

In some embodiments, the axial ultrasonic detection mechanism further includes a second position adjusting member, the second position adjusting member is a second micro cylinder, and the cylinder body of the second micro cylinder is fixed to the first fixing member A rod, the output shaft of the second micro cylinder is fixedly connected with the axial ultrasonic receiver.

In some embodiments, a first temperature detector and a first pressure detector are also fixed on the first fixing rod.

In some embodiments, the circumferential ultrasonic detection mechanism further includes a third position adjusting member, the third position adjusting member is a third micro cylinder, and the cylinder body of the third micro cylinder is fixed to the second fixing member a rod, and the output shaft of the third micro cylinder is fixedly connected with the circumferential ultrasonic generator.

In some embodiments, the circumferential ultrasonic detection mechanism further includes a fourth position adjusting member, the fourth position adjusting member is a fourth micro cylinder, and the cylinder body of the fourth micro cylinder is fixed to the second fixing member a rod, and the output shaft of the fourth micro cylinder is fixedly connected with the circumferential ultrasonic receiver.

In some embodiments, a second temperature detector and a second pressure detector are also fixed on the second fixing rod.

In some embodiments, the second fixing rod is a hollow structure and has a flow-through cavity; the circumferential ultrasonic detection mechanism further includes a first centralizer and a second centralizer, one end of the first centralizer is connected to The first fixing rod is connected, the other end of the first centralizer is connected with one end of the second fixing rod, the first centralizer has an inflow chamber that communicates with the overflow chamber, the first centralizer is The side wall of a centralizer is provided with an inflow hole that communicates with the inflow cavity, one end of the second centralizer is connected to the other end of the second fixing rod, and the second centralizer has a connection with the inflow cavity. The outflow cavity communicated with the overflow cavity, the side wall of the second centralizer is provided with an outflow hole that communicates with the outflow cavity; the circumferential ultrasonic generator and the circumferential ultrasonic receiver are both. arranged in the overflow chamber.

In some embodiments, the positioning detection device further includes a length adjusting member, the length of the length adjusting member is adjustable, one end of the length adjusting member is fixedly connected with the first fixing rod, and the length adjusting member has an adjustable length. The other end is fixedly connected with the second fixing rod.

The invention also provides a device for wellbore leak point location detection, comprising an axial ultrasonic detection mechanism and a circumferential ultrasonic detection mechanism;

The axial ultrasonic detection mechanism includes a first fixed rod, an axial ultrasonic generator and an axial ultrasonic receiver, and the axial ultrasonic generator and the axial ultrasonic receiver are both fixed to the first fixed rod, The axial ultrasonic generator and the axial ultrasonic receiver are oppositely arranged, and the connecting line between the two is parallel to the first fixing rod;

The circumferential ultrasonic detection mechanism includes a second fixed rod, a circumferential ultrasonic generator and a circumferential ultrasonic receiver, the second fixed rod is coaxially and fixedly connected to the first fixed rod, and the circumferential ultrasonic generator is And the circumferential ultrasonic receiver is fixed on the second fixed rod, the circumferential ultrasonic generator and the circumferential ultrasonic receiver are oppositely arranged, and the connecting line of the two intersects with the second fixed rod .

Compared with the prior art, the beneficial effect of the technical solution proposed by the present invention is: when in use, the first fixing rod is coaxially fixed on the drill rod, and follows the drill rod into the wellbore. The ultrasonic signal is continuously sent to the ultrasonic generator and received by the axial ultrasonic receiver. The circumferential ultrasonic generator continuously sends out ultrasonic signals and received by the circumferential ultrasonic receiver. The ultrasonic signal is detected between the axial ultrasonic generator and the axial ultrasonic signal. The propagation time between the ultrasonic receivers can be used to obtain the distribution of the flow rate of the drilling fluid in the axial direction of the wellbore, so as to obtain the depth of lost circulation. The propagation time between the ultrasonic generator and the circumferential ultrasonic receiver can be used to obtain the difference of the flow rate of the drilling fluid in all directions, so that the flow direction of the drilling fluid in the horizontal direction can be judged, and the circumferential azimuth of the lost circulation can be obtained. , and combined with the depth of lost circulation, so that the specific depth and circumferential orientation of lost circulation can be obtained, so as to block the leakage point.

Description of drawings

1 is a schematic structural diagram of an embodiment of a positioning detection device provided by the present invention;

Fig. 2 is an exploded view of the positioning detection device in Fig. 1;

Fig. 3 is the structural representation of the axial ultrasonic testing mechanism in Fig. 1;

Fig. 4 is a partial enlarged view of area A in Fig. 3;

Fig. 5 is a partial enlarged view of region B in Fig. 3;

6 is a schematic structural diagram of the circumferential ultrasonic detection mechanism in FIG. 1;

Fig. 7 is a partial enlarged view of region C in Fig. 6;

Fig. 8 is a partial enlarged view of region D in Fig. 6;

Fig. 9 is the structural representation of the length adjusting member in Fig. 1;

Fig. 10 is a partial enlarged view of region E in Fig. 9;

In the figure: 1-axial ultrasonic testing mechanism, 2-circumferential ultrasonic testing mechanism, 3-length adjusting member, 11-first fixing rod, 111-first temperature detector, 112-first pressure detector, 12- Axial ultrasonic generator, 13-axial ultrasonic receiver, 14-first position adjustment piece, 15-second position adjustment piece, 21-second fixing rod, 211-second temperature detector, 212-second pressure Detector, 213-flow chamber, 22-circumferential ultrasonic generator, 23-circumferential ultrasonic receiver, 24-third position adjusting piece, 25-fourth position adjusting piece, 26-first centralizer, 261- Inflow hole, 27-second centralizer, 271-outflow hole, 28-protection joint, 31-hydraulic cylinder, 32-first sealing ring, 33-second sealing ring.

Detailed ways

The preferred embodiments of the present invention are specifically described below with reference to the accompanying drawings, wherein the accompanying drawings constitute a part of the present application, and together with the embodiments of the present invention, are used to explain the principles of the present invention, but are not used to limit the scope of the present invention.

Referring to FIGS. 1 and 2 , the present invention provides a method for wellbore leak point location detection, including: performing leak point location detection by a location detection device in the wellbore, wherein the location detection device includes an axial ultrasonic wave Detection mechanism 1 and circumferential ultrasonic detection mechanism 2 .

3-5, the axial ultrasonic detection mechanism 1 includes a first fixed rod 11, an axial ultrasonic generator 12 and an axial ultrasonic receiver 13. The axial ultrasonic generator 12 and the axial ultrasonic generator 12 The ultrasonic receivers 13 are all fixed on the first fixing rod 11 , the axial ultrasonic generator 12 and the axial ultrasonic receiver 13 are arranged opposite to each other, and the connecting line between the two is parallel to the first fixing rod 11 . . Through the propagation time of the ultrasonic signal between the axial ultrasonic generator 12 and the axial ultrasonic receiver 13, the flow rate of the drilling fluid in the axial direction of the wellbore can be obtained.

Please refer to FIG. 3 , FIG. 6 , FIG. 7 and FIG. 8 , the circumferential ultrasonic detection mechanism 2 includes a second fixing rod 21 , a circumferential ultrasonic generator 22 and a circumferential ultrasonic receiver 23 . The second fixing rod 21 Coaxially and fixedly connected with the first fixing rod 11, the circumferential ultrasonic generator 22 and the circumferential ultrasonic receiver 23 are both fixed on the second fixing rod 21, and the circumferential ultrasonic generator 22 and The circumferential ultrasonic receivers 23 are disposed opposite to each other, and the connecting line between them intersects with the second fixing rod 21 . In this embodiment, the included angle between the line connecting the circumferential ultrasonic generator 22 and the circumferential ultrasonic receiver 23 and the second fixing rod 21 is 30°, so that the ultrasonic signal is transmitted between the circumferential ultrasonic generator 22 and the circumferential ultrasonic receiver 21 . The propagation time between 23 can not only reflect the flow rate of drilling fluid in the axial direction of the wellbore, but also reflect the flow rate of drilling fluid in the circumferential direction of the wellbore, so that it can be detected with the axial ultrasonic generator 12 and the axial ultrasonic receiver 13. The obtained flow rates in the axial direction are corrected for each other.

When in use, the first fixing rod 11 is coaxially fixed on the drill rod, and follows the drill rod into the wellbore. During this process, the axial ultrasonic generator 12 continuously sends out ultrasonic signals and is received by the axial ultrasonic receiver 13 Receiving, the circumferential ultrasonic generator 22 continuously sends out ultrasonic signals and is received by the circumferential ultrasonic receiver 23, wherein, by detecting the propagation time of the ultrasonic signal between the axial ultrasonic generator 12 and the axial ultrasonic receiver 13, it can be obtained The distribution of the drilling fluid flow rate in the axial direction of the wellbore can be used to obtain the depth of lost circulation. At the same time, due to the continuous rotation of the drill pipe, ultrasonic signals are detected in all directions in the circumferential ultrasonic generator 22 and the circumferential ultrasonic receiver. The propagation time between 23 can be used to obtain the difference in the flow rate of the drilling fluid in all directions, so that the flow direction of the drilling fluid in the horizontal direction can be judged, and the circumferential azimuth of the lost circulation can be obtained, which is combined with the depth of the lost circulation. , so that the specific depth and circumferential orientation of the lost circulation can be obtained, so as to block the leakage point.

In order to improve the accuracy of the detection results of the axial ultrasonic testing mechanism 1, please refer to FIG. 3 to FIG. 5. In a preferred embodiment, the axial ultrasonic testing mechanism 1 further includes a first position adjusting member 14. A position adjusting member 14 is a first micro cylinder, the cylinder body of the first micro cylinder is fixed to the first fixing rod 11 , and the output shaft of the first micro cylinder is fixedly connected to the axial ultrasonic generator 12 , during use, the position of the axial ultrasonic generator 12 can be adjusted by the first position adjustment member 14, thereby changing the distance between the axial ultrasonic generator 12 and the axial ultrasonic receiver 13, through the conditions of multiple sets of distances Then, the propagation time of the ultrasonic signal between the axial ultrasonic generator 12 and the axial ultrasonic receiver 13 is repeatedly detected, and finally the accuracy of the flow rate of the drilling fluid in the axial direction will be higher.

In order to improve the accuracy of the detection results of the axial ultrasonic testing mechanism 1, please refer to FIG. 3 to FIG. 5. In a preferred embodiment, the axial ultrasonic testing mechanism 1 further includes a second position adjusting member 15. The two-position adjusting member 15 is a second micro cylinder, the cylinder body of the second micro cylinder is fixed to the first fixing rod 11 , and the output shaft of the second micro cylinder is fixedly connected to the axial ultrasonic receiver 13 , during use, the position of the axial ultrasonic receiver 13 can be adjusted through the second position adjustment member 15, thereby changing the distance between the axial ultrasonic generator 12 and the axial ultrasonic receiver 13, through the condition of multiple sets of distances Then, the propagation time of the ultrasonic signal between the axial ultrasonic generator 12 and the axial ultrasonic receiver 13 is repeatedly detected, and finally the accuracy of the flow rate of the drilling fluid in the axial direction will be higher.

In order to improve the accuracy of the lost circulation position judgment, please refer to FIGS. 3-5 . In a preferred embodiment, the first fixing rod 11 is also fixed with a first temperature detector 111 and a first pressure detector 112 , the temperature value and pressure value detected by the first temperature detector 111 and the first pressure detector 112 respectively can assist in judging the depth of lost circulation. A sudden change will occur. According to the sudden change of the temperature value and the pressure value, it can assist in judging the depth of the lost circulation.

In order to improve the accuracy of the detection results of the circumferential ultrasonic testing mechanism 2, please refer to FIGS. 6-8. In a preferred embodiment, the circumferential ultrasonic testing mechanism 2 further includes a third position adjusting member 24. The three-position adjusting member 24 is a third micro cylinder, the cylinder body of the third micro cylinder is fixed to the second fixing rod 21 , and the output shaft of the third micro cylinder is fixedly connected to the circumferential ultrasonic generator 22 . During use, the position of the circumferential ultrasonic generator 22 can be adjusted through the third position adjusting member 24, thereby changing the distance between the circumferential ultrasonic generator 22 and the circumferential ultrasonic receiver 23. , the propagation time of the ultrasonic signal between the circumferential ultrasonic generator 22 and the circumferential ultrasonic receiver 23 is repeatedly detected, and finally the accuracy of the flow rate of the drilling fluid in the circumferential direction will be higher.

In order to improve the accuracy of the detection results of the circumferential ultrasonic testing mechanism 2, please refer to FIGS. 6 to 8. In a preferred embodiment, the circumferential ultrasonic testing mechanism 2 further includes a fourth position adjusting member 25. The four-position adjusting member 25 is a fourth micro cylinder, the cylinder body of the fourth micro cylinder is fixed to the second fixing rod 21 , and the output shaft of the fourth micro cylinder is fixedly connected to the circumferential ultrasonic receiver 23 . During use, the position of the circumferential ultrasonic receiver 23 can be adjusted through the fourth position adjusting member 25, thereby changing the distance between the circumferential ultrasonic generator 22 and the circumferential ultrasonic receiver 23. , the propagation time of the ultrasonic signal between the circumferential ultrasonic generator 22 and the circumferential ultrasonic receiver 23 is repeatedly detected, and finally the accuracy of the flow rate of the drilling fluid in the circumferential direction will be higher.

In order to improve the accuracy of the lost circulation position determination, please refer to FIGS. 6-8 . In a preferred embodiment, a second temperature detector 211 and a second pressure detector 212 are also fixed on the second fixing rod 21 . , the temperature value and pressure value detected by the second temperature detector 211 and the second pressure detector 212 respectively can assist in judging the depth of lost circulation. A sudden change will occur. According to the sudden change of the temperature value and the pressure value, it can assist in judging the depth of the lost circulation.

In order to improve the accuracy of the detection result of the circumferential ultrasonic detection mechanism 2 , please refer to FIGS. 6 to 8 . In a preferred embodiment, the second fixing rod 21 is a hollow structure and has a flow-through cavity 213 . The circumferential ultrasonic detection mechanism 2 further includes a first centralizer 26 and a second centralizer 27. One end of the first centralizer 26 is connected to the first fixing rod 11, and the other end of the first centralizer 26 is connected. One end is connected to one end of the second fixing rod 21 , the first centralizer 26 has an inflow chamber that communicates with the overflow chamber 213 , and a side wall of the first centralizer 26 is provided with a connection with the The inflow hole 261 communicated with the inflow chamber, one end of the second centralizer 27 is connected with the other end of the second fixed rod 21 , and the second centralizer 27 has an outlet that communicates with the overflow chamber 213 . A flow cavity, the side wall of the second centralizer 27 is provided with an outflow hole 271 that communicates with the outflow cavity. The circumferential ultrasonic generator 22 and the circumferential ultrasonic receiver 23 are both disposed in the flow-through cavity 213. When in use, when the second fixed rod 21 rotates with the drill rod, the direction of the inflow hole 261 It will change, when the inflow hole 261 is facing the direction of water flow, the water flow from the inflow hole 261 into the overflow cavity 213 is the largest, and when the inflow hole 261 is facing away from the water flow direction, the water flow from the inflow hole 261 into the overflow cavity 213 is the largest. Therefore, the flow direction of the drilling fluid can be judged according to the change of the flow velocity measured by the circumferential ultrasonic generator 22 and the circumferential ultrasonic receiver 23, so as to facilitate the judgment of the circumferential orientation of the lost circulation.

Please continue to refer to FIG. 6-FIG. 8, the lower end of the second centralizer 27 is connected with a protection joint 28. The function of the protection joint 28 is to prevent damage to the internal parts of the device when the device hits other objects at the bottom during the detection process, thereby causing damage to the internal parts of the device. function as a protective device.

In order to facilitate adjustment of the distance between the axial ultrasonic detection mechanism 1 and the circumferential ultrasonic detection mechanism 2, please refer to FIG. 1, FIG. 2, FIG. 9 and FIG. 10. In a preferred embodiment, the positioning detection device further includes The length adjusting member 3, the length of the length adjusting member 3 is adjustable, one end of the length adjusting member 3 is fixedly connected with the first fixing rod 11, and the other end of the length adjusting member 3 is fixed with the second fixing rod 11. The rod 21 is fixedly connected. In use, the distance between the axial ultrasonic testing mechanism 1 and the circumferential ultrasonic testing mechanism 2 can be adjusted to adapt to different testing situations.

In order to specifically realize the function of the length adjusting member 3 , please refer to FIG. 1 , FIG. 2 , FIG. 9 and FIG. 10 . In a preferred embodiment, the length adjusting member 3 is a hydraulic cylinder 31 . The body is fixedly connected with the first fixing rod 11 , and the output shaft of the hydraulic cylinder 31 is fixedly connected with the second fixing rod 21 . In order to improve the waterproof effect of the hydraulic cylinder 31 , a first sealing ring 32 is provided inside the hydraulic cylinder 31 , and a second sealing ring 33 is provided outside the hydraulic cylinder 31 . Therefore, during the use of the hydraulic cylinder 31, the external impurities can be initially intercepted by the second sealing ring 33, effectively preventing the impurities from entering the interior of the hydraulic cylinder 31, and the first sealing ring 32 can be used to prevent accidents. The dust and impurities entering the hydraulic cylinder 31 through the second sealing ring 33 are further intercepted, thereby further improving the sealing effect of the hydraulic cylinder 31 and prolonging the service life of the hydraulic cylinder 31 .

The present invention also provides a device for wellbore leak point location detection, comprising an axial ultrasonic detection mechanism 1 and a circumferential ultrasonic detection mechanism 2 . The axial ultrasonic detection mechanism 1 includes a first fixing rod 11, an axial ultrasonic generator 12 and an axial ultrasonic receiver 13, and the axial ultrasonic generator 12 and the axial ultrasonic receiver 13 are both fixed to the The first fixing rod 11 , the axial ultrasonic generator 12 and the axial ultrasonic receiver 13 are disposed opposite to each other, and the connecting line between the two is parallel to the first fixing rod 11 . Through the propagation time of the ultrasonic signal between the axial ultrasonic generator 12 and the axial ultrasonic receiver 13, the flow rate of the drilling fluid in the axial direction of the wellbore can be obtained. The circumferential ultrasonic detection mechanism 2 includes a second fixed rod 21, a circumferential ultrasonic generator 22 and a circumferential ultrasonic receiver 23. The second fixed rod 21 is coaxially and fixedly connected to the first fixed rod 11, so The circumferential ultrasonic generator 22 and the circumferential ultrasonic receiver 23 are both fixed to the second fixing rod 21, and the circumferential ultrasonic generator 22 and the circumferential ultrasonic receiver 23 are oppositely arranged, and the two The connecting line intersects the second fixing rod 21 .

In order to better understand the present invention, the technical solution provided by the present invention will be described in detail below with reference to FIGS. 1 to 10 : when in use, the first fixing rod 11 is coaxially fixed on the drill rod, and follows the drill rod to go down In the wellbore, during this process, the axial ultrasonic generator 12 continuously sends out ultrasonic signals and is received by the axial ultrasonic receiver 13, and the circumferential ultrasonic generator 22 continuously sends out ultrasonic signals and is received by the circumferential ultrasonic receiver 23, wherein, By detecting the propagation time of the ultrasonic signal between the axial ultrasonic generator 12 and the axial ultrasonic receiver 13, the distribution of the drilling fluid flow rate in the axial direction of the wellbore can be obtained, thereby obtaining the depth of lost circulation. The second position adjusting member 15 and/or the third position adjusting member 15 change the distance between the axial ultrasonic generator 12 and the axial ultrasonic receiver 13, so as to repeatedly detect the ultrasonic signal in the axial direction under the condition of multiple sets of distances The propagation time between the ultrasonic generator 12 and the axial ultrasonic receiver 13 will ultimately result in a higher accuracy of the flow rate of the drilling fluid in the axial direction; at the same time, since the drill pipe is constantly rotating, ultrasonic signals are detected in all directions The propagation time between the circumferential ultrasonic generator 22 and the circumferential ultrasonic receiver 23 is changed by the third position adjusting member 24 and/or the fourth position adjusting member 25 to change the circumferential ultrasonic generator 22 and the circumferential ultrasonic receiver 23, so that under the condition of multiple sets of distances, the propagation time of the ultrasonic signal between the circumferential ultrasonic generator 22 and the circumferential ultrasonic receiver 23 is repeatedly detected, and finally the accurate flow rate of the drilling fluid in the circumferential direction is obtained. The difference in the flow rate of drilling fluid in all directions can be obtained, so that the flow direction of the drilling fluid in the horizontal direction can be judged, so as to obtain the circumferential azimuth of the lost circulation, and combined with the depth of the lost circulation, thus The specific depth and circumferential orientation of the lost circulation can be obtained, so as to plug the lost circulation.

The above is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention. , all should be covered within the protection scope of the present invention.

Claims (10)

1. A method for wellbore leak site location detection, comprising: carrying out leakage point positioning detection in a shaft by a positioning detection device, wherein the positioning detection device comprises an axial ultrasonic detection mechanism and a circumferential ultrasonic detection mechanism;

the axial ultrasonic detection mechanism comprises a first fixing rod, an axial ultrasonic generator and an axial ultrasonic receiver, wherein the axial ultrasonic generator and the axial ultrasonic receiver are fixed on the first fixing rod, the axial ultrasonic generator and the axial ultrasonic receiver are oppositely arranged, and a connecting line of the axial ultrasonic generator and the axial ultrasonic receiver is parallel to the first fixing rod;

the circumference ultrasonic detection mechanism comprises a second fixed rod, a circumference ultrasonic generator and a circumference ultrasonic receiver, the second fixed rod is coaxially and fixedly connected with the first fixed rod, the circumference ultrasonic generator reaches the circumference ultrasonic receiver is fixed on the second fixed rod, the circumference ultrasonic generator reaches the circumference ultrasonic receiver is oppositely arranged, and the connecting line of the circumference ultrasonic generator and the circumference ultrasonic receiver is intersected with the second fixed rod.

2. The method for wellbore leak site location detection as recited in claim 1, wherein the axial ultrasonic detection mechanism further comprises a first position adjusting member, the first position adjusting member is a first micro cylinder, a cylinder body of the first micro cylinder is fixed to the first fixing rod, and an output shaft of the first micro cylinder is fixedly connected to the axial ultrasonic generator.

3. The method for wellbore leak site location detection as recited in claim 1, wherein the axial ultrasonic detection mechanism further comprises a second position adjustment member, the second position adjustment member is a second micro-cylinder, a cylinder body of the second micro-cylinder is fixed to the first fixing rod, and an output shaft of the second micro-cylinder is fixedly connected to the axial ultrasonic receiver.

4. The method for wellbore leak site location detection of claim 1, wherein the first stationary rod further has a first temperature detector and a first pressure detector secured thereto.

5. The method for wellbore leak site location detection according to claim 1, wherein the circumferential ultrasonic detection mechanism further comprises a third position adjusting member, the third position adjusting member is a third micro cylinder, a cylinder body of the third micro cylinder is fixed to the second fixing rod, and an output shaft of the third micro cylinder is fixedly connected to the circumferential ultrasonic generator.

6. The method for wellbore leak site location detection as recited in claim 1, wherein the circumferential ultrasonic detection mechanism further comprises a fourth position adjusting member, the fourth position adjusting member is a fourth micro cylinder, a cylinder body of the fourth micro cylinder is fixed to the second fixing rod, and an output shaft of the fourth micro cylinder is fixedly connected to the circumferential ultrasonic receiver.

7. The method for wellbore leak site location detection of claim 1, wherein a second temperature detector and a second pressure detector are further secured to the second securing rod.

8. The method for wellbore leak site location detection as recited in claim 1, wherein the second stationary rod is a hollow structure and has an overflow lumen;

the circumferential ultrasonic detection mechanism further comprises a first centralizer and a second centralizer, one end of the first centralizer is connected with the first fixing rod, the other end of the first centralizer is connected with one end of the second fixing rod, the first centralizer is provided with a flow inlet cavity communicated with the flow passing cavity, the side wall of the first centralizer is provided with a flow inlet hole communicated with the flow inlet cavity, one end of the second centralizer is connected with the other end of the second fixing rod, the second centralizer is provided with a flow outlet cavity communicated with the flow passing cavity, and the side wall of the second centralizer is provided with a flow outlet hole communicated with the flow outlet cavity;

the circumferential ultrasonic generator and the circumferential ultrasonic receiver are arranged in the overflowing cavity.

9. The method for wellbore leak site location detection of claim 1, wherein the location detection device further comprises a length adjustment member, the length adjustment member having an adjustable length, one end of the length adjustment member being fixedly connected to the first fixed rod and the other end of the length adjustment member being fixedly connected to the second fixed rod.

10. A device for positioning and detecting leakage points of a shaft is characterized by comprising an axial ultrasonic detection mechanism and a circumferential ultrasonic detection mechanism;

the axial ultrasonic detection mechanism comprises a first fixing rod, an axial ultrasonic generator and an axial ultrasonic receiver, wherein the axial ultrasonic generator and the axial ultrasonic receiver are fixed on the first fixing rod, the axial ultrasonic generator and the axial ultrasonic receiver are oppositely arranged, and a connecting line of the axial ultrasonic generator and the axial ultrasonic receiver is parallel to the first fixing rod;

the circumference ultrasonic detection mechanism comprises a second fixed rod, a circumference ultrasonic generator and a circumference ultrasonic receiver, the second fixed rod is coaxially and fixedly connected with the first fixed rod, the circumference ultrasonic generator reaches the circumference ultrasonic receiver is fixed on the second fixed rod, the circumference ultrasonic generator reaches the circumference ultrasonic receiver is oppositely arranged, and the connecting line of the circumference ultrasonic generator and the circumference ultrasonic receiver is intersected with the second fixed rod.

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