CN218716721U

CN218716721U - Underground horizontal stress measuring device

Info

Publication number: CN218716721U
Application number: CN202220358179.8U
Authority: CN
Inventors: 周拿云; 李华; 卢进
Original assignee: Sichuan Jinchen Testing Technology Co ltd
Current assignee: Sichuan Jinchen Testing Technology Co ltd
Priority date: 2022-02-22
Filing date: 2022-02-22
Publication date: 2023-03-24
Anticipated expiration: 2032-02-22

Abstract

The utility model discloses a ground stress test technical field's a horizontal ground stress measurement device in pit, include: a wellbore; a drill rod assembly disposed in an interior cavity of the wellbore; the righting mechanism is arranged on one side, close to the well bottom, of the drill rod assembly; a measuring device mounted on the centralizing mechanism on a side remote from the drill rod assembly, the measuring device comprising: a mounting plate mounted on a side of the centralizer distal from the gyroscope; the measuring mechanism is arranged on one side, far away from the centralizer, of the mounting plate; four nozzles, four the nozzle is the rectangle and installs keep away from on the mounting disc one side of centralizer, the utility model discloses directly utilize current well body structure, need not bore the aperture again and install any equipment in the aperture, construction process is simpler, and the operation risk is low, the degree of difficulty is little.

Description

Underground horizontal stress measuring device

Technical Field

The utility model relates to a ground stress test technical field specifically is a horizontal level stress measurement device in pit.

Background

Hydraulic fracturing is an important technical measure for increasing the production of oil and gas wells and increasing the injection of water injection wells. The magnitude and state of the ground stress currently determine the occurrence and propagation of hydraulic fractures, which are important parameters for fracture design. Overburden pressure is currently determined by density logging. The minimum level principal stress magnitude can be reliably measured through technologies such as pressure diagnosis, DFIT test and the like, and particularly, the minimum level principal stress value of a well needing fracturing can be easily obtained through pressure drop analysis after a pump is stopped. However, the maximum horizontal main stress can only be obtained by indirect calculation through methods such as well logging interpretation and core experiments, and the accuracy and reliability are difficult to verify.

The hydraulic fracturing method is based on the maximum tensile stress criterion, the ideal model and the actual stress state and the fracture behavior of underground rocks are different, the fracture pressure and the tensile strength parameters required in calculation are not easy to obtain accurately, the maximum horizontal ground stress is obtained by theoretical indirect calculation instead of direct measurement, and the accuracy is difficult to verify.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a horizontal ground stress measuring device in pit to solve the hydrofracturing method that proposes in the above-mentioned background art and all have the difference based on the biggest tensile stress rule, the actual stress state and the fracture action of idealized model and underground rock, required rupture pressure, the difficult accurate acquisition of tensile strength parameter when calculating, and the biggest horizontal ground stress is according to theoretical indirect calculation to try to get out rather than directly record, the problem that the accuracy is difficult to verify.

In order to achieve the above purpose, the utility model provides a following technical scheme: a downhole horizontal ground stress measurement device comprising:

a wellbore;

a drill rod assembly disposed in an interior cavity of the wellbore;

the righting mechanism is arranged on one side, close to the well bottom, of the drill rod assembly;

the measuring equipment is installed on one side, far away from the drill rod component, of the centering mechanism.

Preferably, the drill rod assembly comprises:

the drill rod is vertically arranged in the inner cavity of the shaft;

and the connecting block is arranged at one end of the drill rod close to the well bottom.

Preferably, the righting mechanism comprises:

the gyroscope is arranged at one end, far away from the drill rod, of the connecting block;

the centralizer is installed on one side, far away from the connecting block, of the gyroscope.

Preferably, the measuring apparatus includes:

the mounting disc is mounted on one side, far away from the gyroscope, of the centralizer;

the measuring mechanism is arranged on one side, far away from the centralizer, of the mounting plate;

the four nozzles are arranged on one side, far away from the centralizer, of the mounting disc in a rectangular shape;

the drilling mechanism is installed on one side, far away from the centralizer, of the mounting disc.

Preferably, the measuring mechanism includes:

the four cameras are installed on the edge of one side, far away from the centralizer, of the installation disc in a rectangular mode and are located on the outer side of the nozzle;

four lighting devices, four lighting devices are installed in a rectangular mode and are far away from the edge of one side of the centralizer on the mounting disc, and the four lighting devices and the four cameras are arranged in a staggered mode.

Preferably, the drilling mechanism comprises:

the drill bit is arranged at the center of one side, far away from the centralizer, of the mounting disc and is arranged on the inner sides of the four nozzles;

the hollow drill bit is installed on the edge, far away from one side of the centralizer, of the mounting disc, the hollow drill bits are arranged on the outer sides of the four cameras, and the hollow drill bits and the drill bits are coaxially arranged.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses directly utilize current well body structure, need not bore the aperture again and install any equipment in the aperture, the work procedure is simpler, the operation risk is low, the degree of difficulty is little, it deepens the shaft bottom to drive measuring equipment through the drilling rod, shoot the shaft bottom through four cameras, and through in communication equipment transmits the image of shooing to ground control center, synthesize a picture into a shaft bottom high definition image through image registration technique, save for shaft bottom plane image, reuse hollow drill bit and drill out slot and hole at the shaft bottom, relieve the ground stress of acting on horizontal direction on the trench inner pillar, the circular of shaft bottom hole and slot is concentric, shoot once more through four cameras to the shaft bottom after the stress is relieved once more and obtain shaft bottom plane image and upload to ground control center, through digital image correlation method, utilize shaft bottom plane image to combine the gyroscope to try to get out the strain force of shaft bottom at radial, obtain the accurate value of ground stress, directly utilize current well body structure, need not to bore the aperture again and install any equipment in the aperture, the construction process is simpler, the operation risk is low, the degree of difficulty is little.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is the structure schematic diagram of the measuring device of the present invention.

In the figure: 100 wellbores, 200 drill rod assemblies, 210 drill rods, 220 connection blocks, 300 centralizing mechanisms, 310 gyroscopes, 320 centralizers, 400 measuring equipment, 410 mounting plates, 420 measuring mechanisms, 421 cameras, 422 illuminators, 430 nozzles, 440 drilling mechanisms, 441 drill bits, 442 hollow drill bits.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model provides a downhole horizontal stress measuring device directly utilizes current well bore structure, need not bore the aperture again and install any equipment in the aperture, and construction process is simpler, and the operation risk is low, the degree of difficulty is little, please refer to and draw together figure 1, include: a wellbore 100, a drill rod assembly 200, a centralizing mechanism 300, and a measuring device 400;

referring again to fig. 1, the wellbore 100 is an existing wellbore in a mine;

referring again to fig. 1, a drill rod assembly 200 is disposed in the interior of the wellbore 100, the drill rod assembly 200 comprising:

the drill pipe 210 is vertically arranged in the inner cavity of the well 100;

the connecting block 220 is arranged at one end of the drill rod 210 close to the bottom of the well, the connecting block 220 and the drill rod 210 are integrally processed, and the connecting block 220 is used for connecting the measuring mechanism 400, the drill rod 210 and a cable;

referring again to fig. 1, a centralizer 300 is mounted to the drill rod assembly 200 adjacent to the side of the bottom of the well, the centralizer 300 including:

the gyroscope 310 is detachably arranged at one end, far away from the drill rod 210, of the connecting block 220 through a bolt;

the centralizer 320 is detachably mounted on the gyroscope 310 through a bolt at one side far away from the connecting block 220, the measuring mechanism 400 is placed at the center of the plane of the shaft 100 and fixed by the centralizer 320, a hole is reserved between supports of the centralizer 320, and fluid in the drill rod 210 is sprayed out from the drill bit 441 and can carry rock debris to pass through;

referring to fig. 1-2, a measuring device 400 is mounted on the centralizer 300 on a side thereof remote from the drill rod assembly 200, the measuring device 400 including:

the mounting plate 410 is detachably mounted on the side of the centralizer 320 far away from the gyroscope 310 through bolts;

a measuring mechanism 420 is mounted on the mounting plate 410 on a side remote from the centralizer 320, the measuring mechanism 420 comprising:

the four cameras 421 are installed on the edge of one side of the installation disc 410 far away from the centralizer 320 in a rectangular shape, the cameras 421 are arranged outside the nozzle 430, and the cameras 421 shoot bottom hole images and transmit the bottom hole images to a ground computer terminal through cables so as to store and analyze the images;

the four illuminating devices 422 are installed on the edge of one side, far away from the centralizer 320, of the mounting plate 410 in a rectangular shape, and the four illuminating devices 422 and the four cameras 421 are arranged in a staggered mode;

the four nozzles 430 are arranged on the mounting plate 410 in a rectangular shape and are far away from one side of the centralizer 320, and the clean water well drill rod 210 pumped from the ground, the connecting block 220 and the centralizer 320 are ejected out of the nozzles 430, so that the effects of cooling the drill bit, flushing the well bottom and carrying rock debris to leave the well bottom are achieved;

the drilling mechanism 440 is installed on the side of the mounting plate 410 away from the centralizer 320, the drilling mechanism 440 drills a hole at the bottom of the well, the power source of the drilling mechanism 440 may be the energy of the liquid in the drill pipe, which is converted into power by a turbine and a screw, or the power source may be the electric energy provided by a cable, the drilling mechanism 440 includes:

the drill bit 441 is arranged at the central position of one side of the mounting plate 410, which is far away from the centralizer 320, the drill bit 441 is arranged at the inner sides of the four nozzles 430, a water outlet hole is formed in the drill bit 441, and the clean water well drill rod 210 pumped from the ground, the connecting block 220 and the centralizer 320 are ejected out of the water outlet hole and the nozzles on the drill bit 441 to play roles of cooling the drill bit, washing the well bottom and carrying rock debris to leave the well bottom;

the hollow drill bit 441 is installed at the edge of one side of the installation disc 410, which is far away from the centralizer 320, the hollow drill bit 441 is arranged outside the four cameras 421, and the hollow drill bit 441 and the drill bit 441 are coaxially arranged.

When the device is used specifically, the measuring device 400 is driven to go deep into the well bottom through the drill rod 210, the well bottom is shot through the four cameras 421, the shot images are transmitted to the ground control center through the communication device, 4 pictures are synthesized into 1 well bottom high-definition image through the image registration technology and stored as a well bottom plane image 1, then a hollow drill 442 and a drill 441 are used for drilling a groove and an inner hole in the well bottom, the horizontal ground stress acting on a rock pillar in the groove is relieved, the inner hole and the groove are concentric in a circle shape, the well bottom after the stress is relieved is shot again through the four cameras 421 to obtain a well bottom plane image 2 and the well bottom plane image 2 is uploaded to the ground control center, the well bottom plane image 2 is used for obtaining the radial strain force of the well bottom through a digital image correlation method, the accurate value of the ground stress is obtained, the existing well body structure is directly used, no small hole needs to be drilled and any device is installed in the small hole, the construction process is simpler, the operation risk is low, and the difficulty is small.

While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, as long as there is no structural conflict, the various features of the disclosed embodiments of the present invention can be used in any combination with each other, and the description of such combinations is not exhaustive in the present specification only for the sake of brevity and resource conservation. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. The utility model provides a downhole horizontal stress measuring device which characterized in that: the method comprises the following steps:

a wellbore (100);

a drill rod assembly (200), the drill rod assembly (200) disposed within an interior cavity of the wellbore (100);

a centralizing mechanism (300), the centralizing mechanism (300) being mounted on the drill rod assembly (200) on a side adjacent to the bottom of the well;

a measurement device (400), the measurement device (400) being mounted on the centralizing mechanism (300) on a side remote from the drill rod assembly (200).

2. A downhole horizontal stress measuring apparatus according to claim 1, wherein: the drill rod assembly (200) includes:

a drill pipe (210), wherein the drill pipe (210) is vertically arranged in the inner cavity of the well bore (100);

a connection block (220), the connection block (220) being disposed on an end of the drill pipe (210) adjacent to a bottom hole.

3. A downhole horizontal stress measuring device according to claim 2, wherein: the righting mechanism (300) comprises:

a gyroscope (310), wherein the gyroscope (310) is arranged at one end of the connecting block (220) far away from the drill rod (210);

a centralizer (320), the centralizer (320) being mounted on the gyroscope (310) on a side remote from the connection block (220).

4. A downhole horizontal stress measuring device according to claim 3, wherein: the measuring device (400) comprises:

a mounting plate (410), the mounting plate (410) being mounted on the centralizer (320) on a side remote from the gyroscope (310);

a measuring mechanism (420), the measuring mechanism (420) being mounted on the mounting plate (410) on a side remote from the centralizer (320);

four nozzles (430), wherein the four nozzles (430) are installed on one side, far away from the centralizer (320), of the mounting plate (410) in a rectangular shape;

a drilling mechanism (440), the drilling mechanism (440) being mounted on a side of the mounting plate (410) remote from the centralizer (320).

5. A downhole horizontal stress measuring device according to claim 4, wherein: the measuring mechanism (420) comprises:

the four cameras (421), the four cameras (421) are installed on the edge of one side, far away from the centralizer (320), of the mounting disc (410) in a rectangular shape, and the cameras (421) are arranged on the outer side of the nozzle (430);

four lighting devices (422), four lighting devices (422) are installed for the rectangle the edge of keeping away from centralizer (320) one side on mounting disc (410), four lighting devices (422) and four camera (421) crisscross the setting.

6. A downhole horizontal stress measuring device according to claim 5, wherein: the drilling mechanism (440) comprises:

a drill bit (441), the drill bit (441) being mounted on the mounting plate (410) at a central location on a side thereof remote from the centralizer (320), the drill bit (441) being inboard of the four nozzles (430);

the hollow drill bit (441), the hollow drill bit (441) is installed on the edge of one side, far away from the centralizer (320), of the mounting disc (410), the hollow drill bit (441) is arranged on the outer sides of the four cameras (421), and the hollow drill bit (441) and the drill bit (441) are coaxially arranged.