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CN-121994390-A - Multi-point ground stress monitoring device and method for well hole

CN121994390ACN 121994390 ACN121994390 ACN 121994390ACN-121994390-A

Abstract

The invention belongs to the technical field of ground stress monitoring devices, and particularly relates to a device and a method for monitoring the ground stress of multiple points of a well hole. The ground stress monitoring device comprises a supporting column, the supporting column comprises an upper section and a lower section, a plurality of limit columns are vertically and fixedly connected between the upper section and the lower section, a coaxial guide column is fixedly connected with the bottom end of the lower section, an installation groove is formed in the bottom of the guide column, and the axle center of the lower section and the guide column are rotationally inserted through the same driving shaft. Compared with the existing ground stress monitoring device, the device has the advantages that the plurality of groups of monitoring modules are arranged, and the plurality of pressure monitoring assemblies are arranged in each group of monitoring modules, so that the well stress at different depths and the well stress at different positions at the same depth can be monitored in real time, the continuity and the accuracy of the well stress monitoring are greatly improved, and comprehensive and objective data support is provided for subsequent safety evaluation.

Inventors

  • ZHANG ZHONGYUAN
  • Bu Mohua
  • HE MANCHAO

Assignees

  • 中国地质科学院地质力学研究所

Dates

Publication Date
20260508
Application Date
20260123

Claims (9)

  1. 1. A multipoint earth stress monitoring device for a well hole comprises a supporting column and is characterized in that the supporting column comprises an upper section (1) and a lower section (2), a plurality of limit posts (3) are vertically and fixedly connected between the upper section (1) and the lower section (2), a coaxial guide post (4) is fixedly connected to the bottom end of the lower section (2), a mounting groove is formed in the bottom of the guide post (4), the same driving shaft (5) is rotatably inserted in the positions of the axes of the lower section (2) and the guide post (4), the bottom ends of the driving shaft (5) are located in the mounting groove, a first motor (6) is connected to the bottom ends of the driving shaft (5) in a transmission mode, a reciprocating screw rod (8) is connected between the top end of the driving shaft (5) and the bottom end of the upper section (1) through a one-way coupling (7), threads identical with the reciprocating screw rod (8) are formed in the surface of the top of the lower section (2), fixing posts (9) are sleeved on the driving shaft (5) and the reciprocating screw rod (8), the two fixing posts (9) and the lower section (2) are rotatably inserted in the same driving shaft (5), the number of the same as the number of the fixing posts (10) is the number of the fixing assemblies, the fixing assemblies are fixedly sleeved on the monitoring module (10) and the monitoring module (10), and a plurality of pressure monitoring components are evenly distributed on the side face of the fixed ring (10), and the driving component is sleeved on the lower section (2) or the fixed column (9) and is used for pushing the plurality of pressure monitoring components to be attached to the inner wall of the deep well one by one, so that the pressure monitoring operation of the plurality of pressure monitoring components on the walls of the well at different positions of the same depth of the deep well is realized.
  2. 2. The device for monitoring the multi-point ground stress of a well hole according to claim 1, wherein the pressure monitoring assembly comprises a contact block (11), a first elastic piece (12), a pressure sensor (13), a second elastic piece (14) and a pressing block (15), the pressure sensor (13) is located between the contact block (11) and the pressing block (15), the contact block (11) is far away from the fixed ring (10) than the pressing block (15), the number of the first elastic piece (12) and the number of the second elastic piece (14) are two, the two first elastic pieces (12) are symmetrically connected between the contact block (11) and the pressing block (15) and used for clamping and fixing the pressure sensor (13) in cooperation with the contact block (11) and the pressing block (15), and the two second elastic pieces (14) are symmetrically and fixedly connected between the pressing block (15) and the fixed ring (10).
  3. 3. The device for monitoring the multi-point ground stress of the well hole according to claim 2, wherein the driving assembly comprises a mounting ring (16), a toothed ring (17), a mounting cover (18), a second motor (19), a rotating shaft (20), a gear (21) and a pressing mechanism, the mounting ring (16) is fixedly sleeved on the lower section (2) or the fixed column (9), an annular groove is formed in one side, far away from the fixed ring (10), of the mounting ring (16), the toothed ring (17) is fixedly sleeved on the lower section (2) or the fixed column (9), the toothed ring (17) is positioned on one side, far away from the fixed ring (10), of the mounting ring (16), teeth of the toothed ring (17) are uniformly distributed on the side surface of the toothed ring, the mounting cover (18) is rotatably sleeved on the lower section (2) or the fixed column (9), the mounting cover (18) is positioned on one side, far away from the mounting ring (16), the toothed ring (17) is surrounded by the mounting cover (18), the second motor (19) is fixedly sleeved on one side, far away from the fixed ring (16) is fixedly connected with the rotating shaft (20) along the vertical direction, and is vertically inserted and connected with the rotating shaft (20) along the rotating shaft, the gear (21) is fixedly sleeved at one end, far away from the second motor (19), of the rotating shaft (20), the gear (21) is meshed with the toothed ring (17), and the pressing mechanism is arranged between the annular groove and the mounting cover (18) and used for pressing the pressure sensors (13) one by one in the rotating process of the mounting cover (18).
  4. 4. The device for monitoring the multi-point ground stress of the well hole according to claim 3, wherein the pressing mechanism comprises a third motor (22), a screw rod (23), a pressing plate (24), pressing rods (25) and locking pieces, the third motor (22) is fixedly arranged on one side of the mounting cover (18) far away from the mounting ring (16), the screw rod (23) is vertically and rotationally inserted and connected on the mounting cover (18), one end of the screw rod (23) is in transmission connection with the third motor (22), the pressing plate (24) is in threaded connection with one end of the screw rod (23) far away from the third motor (22), the pressing plates (24) are positioned in the annular groove, the pressing rods (25) are in one-to-one correspondence with the pressing sensors (13), the pressing rods (25) vertically slide in the annular groove, the pressing rods (25) are vertically and slidingly connected with the inner groove wall and the outer groove wall of the annular groove, the part of the pressing rods (25) positioned in the annular groove is separately provided with a gap which is matched with the width of the annular groove, the gap (24) is matched with the width of the opening (gap) of the pressing plate, the gap (24) is matched with the gap (width of the top part is matched with the gap (gap) of the gap, the part of depression bar (25) outside being located the ring channel is protruding to the direction that is close to pressure sensor (13), and the part of depression bar (25) outside being located the ring channel is close to one side of pressure sensor (13) and is the inclined plane design, the part of depression bar (25) outside being located the ring channel slides and pegs graft between two second elastic component (14) that correspond, the one side that extrusion piece (15) just is right with depression bar (25) is the inclined plane design, and the width of depression bar (25) is narrowing gradually to the direction of keeping away from collar (16), the inclined plane of the part of depression bar (25) outside the ring channel is in the same place with the parallel laminating of inclined plane of extrusion piece (15), the locking piece is installed on depression bar (25) for the position after to depression bar (25) motion locks.
  5. 5. The device for monitoring the multipoint ground stress of the well hole according to claim 4, wherein the locking pieces are two metal elastic pieces (26), the two metal elastic pieces (26) are symmetrically and fixedly connected to the side surfaces of the pressing rod (25), vertical sliding grooves are formed in the positions, opposite to the two metal elastic pieces (26), of the inner groove wall and the outer groove wall of the annular groove, the two metal elastic pieces (26) can be always kept close to the side walls of the sliding grooves under the action of self elasticity, and the contact part of the metal elastic pieces (26) and the inner wall of the sliding grooves is vertical, so that friction force between the metal elastic pieces (26) and the side walls of the sliding grooves is increased.
  6. 6. The device for monitoring the multi-point ground stress of a well hole according to claim 5, wherein the diameter of the guide post (4) is larger than that of the circumference of the first elastic piece (12) where the plurality of contact blocks (11) are located in the initial state, and a sealing plate (27) is detachably arranged at the opening of the mounting groove at the bottom end of the guide post (4).
  7. 7. The multi-point ground stress monitoring device for a well bore according to claim 6, wherein the plurality of limit posts (3) are uniformly distributed between the upper section (1) and the lower section (2) in a ring shape, and the limit posts (3) are inserted between two ends of the fixed posts (9) in a sliding penetrating manner.
  8. 8. The device for monitoring the stress at multiple points of a well bore according to claim 7, wherein the two fixed columns (9) are respectively connected with the driving shaft (5) and the reciprocating screw rod (8) in a threaded manner, and the maximum distances of the two fixed columns (9) moving along the driving shaft (5) and the reciprocating screw rod (8) are the same.
  9. 9. A monitoring method using the multi-point earth stress monitoring device for a well bore of claim 8, comprising the steps of: Inserting a monitoring module installed on a support column and a fixed column (9) into a wellhead to be tested through the support column, and stopping extending downwards out of the support column after the monitoring module is inserted into a specified depth; Starting a first motor (6) to rotate forward, so that a driving shaft (5) and a one-way coupler (7) drive a reciprocating screw rod (8) to rotate, and further two fixing columns (9) can respectively drive a fixing ring (10) connected with the fixing columns to move along the vertical direction, so that the synchronous adjustment of the depth positions of pressure sensors (13) on the two fixing rings (10) is completed; In addition, the first motor (6) can be reversely rotated, and the unidirectional coupler (7) is in an idle state at the moment, so that the position of the monitoring module positioned on the bottom fixed column (9) in the vertical direction can be independently adjusted according to the measurement requirement; After the adjustment is finished, a third motor (22) is started, the pressing plate (24) is driven to move downwards through a screw (23), so that the pressing plate (24) presses the pressing rod (25), the pressing rod (25) can push the pressing block (15) through the inclined surface of the pressing rod and the pressure sensor (13) to be attached to the well wall, the pressure of the current position of the well wall is monitored, when the pressing plate (24) finishes the pressing operation of the pressing rod (25), a metal elastic sheet (26) can lock the pressing rod (25) through the friction force with a sliding groove, and then the third motor (22) reversely rotates and drives the pressing plate (24) to reset; Step five, after the pressing plate (24) is reset, the second motor (19) is started, so that the mounting cover (18), the third motor (22), the pressing plate (24) and the screw (23) are driven to rotate together through the cooperation of the gear (21) and the toothed ring (17), and after the pressing plate (24) rotates into a notch of an adjacent pressing rod (25), the third motor (22) can repeat the operation in the step four, so that the corresponding pressure sensor (13) can monitor the pressure at the corresponding position of the well wall; And step six, after all the pressure sensors (13) are tightly attached to the well wall through the contact blocks (11) according to the operation in the step five, the process in the step four and the step five can be repeated, and each pressure sensor (13) is readjusted until the pressure of all the pressure sensors (13) is kept the same, and then the monitoring operation of the well wall pressure can be realized by observing the numerical change of the pressure sensors (13).

Description

Multi-point ground stress monitoring device and method for well hole Technical Field The invention belongs to the technical field of ground stress monitoring devices, and particularly relates to a device and a method for monitoring the ground stress of multiple points of a well hole. Background In deep underground engineering (such as mine exploitation, tunnel excavation, underground gas storage construction and the like) and fault activity scientific observation, the understanding of the in-situ stress state change of the deep hole is important to the safety and stability of the engineering. At present, the ground stress monitoring devices are mainly pressure sensors, and the monitoring operation of the wall pressure is realized through the pressure change of the pressure sensors. However, when the existing ground stress monitoring device monitors the pressure of the well wall, the existing ground stress monitoring device can only monitor one point of the well wall, so that the existing ground stress monitoring device has the condition of inaccurate monitoring. Accordingly, there is a need for a multi-point earth stress monitoring device and method for a wellbore that addresses the above-described issues. Disclosure of Invention In view of the foregoing, the present invention provides a device and a method for multi-point earth stress monitoring of a borehole, so as to solve the foregoing problems in the prior art. In order to achieve the above purpose, the present invention provides the following technical solutions: The utility model provides a be used for wellbore multiposition ground stress monitoring devices, includes the support column, the support column includes upper segment and hypomere, perpendicular fixedly connected with a plurality of spacing posts between upper segment and the hypomere, the coaxial guide post of bottom fixedly connected with of hypomere, and the mounting groove has been seted up to the bottom of guide post, the axle center department rotation of hypomere and guide post runs through and peg graft there is same drive shaft, the bottom of drive shaft is located the mounting groove, and the bottom transmission of drive shaft is connected with first motor, be connected with reciprocating screw rod through one-way shaft coupling between the top of drive shaft and the bottom of upper segment, the table that the drive shaft is located the hypomere top has seted up with reciprocating screw rod the screw thread the same, all cup jointed the fixed column on drive shaft and the reciprocating screw rod, two install monitoring module on fixed column and the hypomere; The monitoring module comprises a fixed ring, pressure monitoring components and a driving component, wherein the fixed ring is fixedly sleeved on the lower section or the fixed column, the pressure monitoring components are multiple in number and uniformly distributed on the side face of the fixed ring in an annular mode, and the driving component is sleeved on the lower section or the fixed column and used for pushing the pressure monitoring components to be attached to the inner wall of a deep well one by one so as to realize pressure monitoring operation of the pressure monitoring components on the walls of the deep well at different positions of the same depth. Further, the pressure monitoring assembly comprises a contact block, a first elastic piece, a pressure sensor, a second elastic piece and an extrusion block; The pressure sensor is located the contact block with between the extrusion piece, and the contact block is more kept away from solid fixed ring than the extrusion piece, the quantity of first elastic component and second elastic component is two, and two first elastic component symmetrical connection is between contact block and extrusion piece, is used for the cooperation the contact block with the extrusion piece will pressure sensor presss from both sides tightly fixedly, two second elastic component symmetrical fixed connection is between extrusion piece and solid fixed ring. Further, the driving assembly comprises a mounting ring, a toothed ring, a mounting cover, a second motor, a rotating shaft, a gear and a pressing mechanism; The installation ring is fixedly sleeved on the lower section or the fixed column, an annular groove is formed in one side, far away from the fixed ring, of the installation ring, the toothed ring is fixedly sleeved on the lower section or the fixed column, the toothed ring is located on one side, far away from the fixed ring, of the installation ring, teeth of the toothed ring are evenly distributed on the side face of the toothed ring in an annular mode, the installation cover is rotatably sleeved on the lower section or the fixed column, the installation cover is located on one side, far away from the installation ring, of the toothed ring, the toothed ring is surrounded by the installation cover, the second motor is fixedly installed on one side, far away from the installat