Underground data acquisition system

Abstract

The utility model relates to the technical field of underground data acquisition, in particular to an underground data acquisition system, which comprises a data acquisition ball and a ball receiver, a pressure sensor and a temperature sensor are arranged in the data acquisition ball, and the pressure sensor and the temperature sensor can respectively acquire data in a well in the data acquisition ball and store the data; and the ball receiver can be lowered into the well through the cable to recycle the data acquisition balls. After the data acquisition ball acquires data in the well, the data acquisition ball is lowered into the well through the ball receiver to be recycled and can be taken out of the well, so that wireless transmission in the well is not needed, the influence of a complex well liquid environment on data transmission is avoided, and the applicability is higher. Through the flow of bridge plug perforation combination and fracturing construction, the data collection ball with the built-in temperature and pressure sensor collects underground temperature and pressure data in the whole process, recovery is completed, higher feasibility and lower technical requirements and working condition requirements are achieved, and underground data can be collected and collected more efficiently with lower cost.

Description

Technical Field

[0001] The utility model relates to the technical field of underground data acquisition, in particular to an underground data acquisition system. Background Art

[0002] At present, oil companies usually only invest in downhole data detection and collection tools during the exploration stage and key areas, such as permanent downhole optical fiber. The optical fiber needs to be put into the well together with the casing and may be damaged during subsequent perforating operations. This means and tools for detecting and collecting downhole data have the disadvantages of complex construction, high cost and low economic benefits, and it is difficult to meet the requirements of fracturing data detection at different fracturing points in the well.

[0003] The Chinese utility model patent with the publication number CN217462140U discloses a system for collecting downhole fracturing data, including a fracturing ball and a tool string. The fracturing ball is used to seal the downhole bridge plug that has been set, and the tool string can set the bridge plug to be set and perforate. The fracturing ball is provided with a pressure sensor and a temperature sensor, and the pressure sensor and the temperature sensor can respectively collect downhole data and store data in the fracturing ball. The front end of the tool string is provided with a data receiver, which can pass from one end of the internal channel of the bridge plug to be set to the other end. The data receiver is used to receive the data stored in the fracturing ball at the previous set bridge plug. The cable connected to the rear end of the tool string can be lifted up and down to bring the data receiver to the outside of the well. It can use the normal bridge plug perforation staged fracturing operation process to complete the downhole fracturing data collection without adding extra construction time and cost to the fracturing operation, and provide relevant operation information and research data for oil companies. The above-mentioned system for collecting downhole fracturing data involves wireless transmission of data stored in downhole fracturing balls and data receivers. However, the well fluid environment is complex, so that wireless transmission may be affected, affecting the applicability of the system. Utility Model Content

[0004] The purpose of the utility model is to provide a downhole data acquisition system to address the problem that the prior art system for collecting downhole fracturing data involves wireless transmission of data stored in a downhole fracturing ball and a data receiver, while the well fluid environment is complex, so that the wireless transmission may be affected, affecting the applicability of the system.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A downhole data acquisition system, comprising a data acquisition ball and a ball receiver, wherein a pressure sensor and a temperature sensor are arranged in the data acquisition ball, and the pressure sensor and the temperature sensor can respectively collect data in the well and store the data in the data acquisition ball;

[0007] The ball receiver can be lowered into the well via a cable to retrieve the data acquisition ball.

[0008] In the downhole data acquisition system described in this scheme, after the data acquisition ball collects data in the well, it is lowered into the well through a ball receiver to be recovered and taken out of the well. Therefore, there is no need for wireless transmission in the well, avoiding the influence of the complex well fluid environment on data transmission, making it more applicable.

[0009] Preferably, the ball receiver comprises an outer tube and a sleeve catch, wherein the sleeve catch is mounted on the front end of the outer tube, and the sleeve catch can be opened and closed.

[0010] By opening the sleeve catch, the data collection ball after data collection can be recovered into the outer tube. After closing the sleeve catch, the data collection ball will not fall out of the outer tube, and can be taken out of the well through the ball receiver.

[0011] Preferably, the radial area of ​​the internal flow channel of the outer cylinder is larger than the radial area between the outer cylinder and the oil pipe.

[0012] This makes the internal flow channel of the outer tube larger and the resistance smaller. During flowback, the well fluid will preferentially pass through the internal flow channel of the outer tube, thereby being able to drive the data acquisition ball to enter the outer tube more accurately.

[0013] Preferably, the sleeve gripper comprises a support ring and a plurality of elastic sheets, the support ring is coaxially arranged with the outer tube, the support ring is installed at the front end of the outer tube, all the elastic sheets are arranged at intervals on the inner side of the support ring, and all the elastic sheets are arranged obliquely to the axial direction of the outer tube and toward the inside of the outer tube;

[0014] When not squeezed, the space between the tail ends of all the elastic sheets is smaller than the data acquisition ball.

[0015] When the well fluid flows back, the well fluid will push the data collection ball to squeeze the elastic sheet, thereby expanding the elastic sheet and allowing the data collection ball to enter the outer tube. After the data collection ball enters the outer tube, the elastic sheet will rebound and return to its original position, preventing the data collection ball from falling out of the outer tube.

[0016] Preferably, all the elastic sheets are obliquely intersected with the axial direction of the outer cylinder by 30°-60°, so as to facilitate the deformation and rebound of the elastic sheets.

[0017] Preferably, the sleeve gripper further comprises a plurality of connecting plates, all of which are arranged at intervals along the circumferential direction on the outer side of the support ring, and all of which are arranged radially;

[0018] The front end of the outer cylinder is provided with a mounting groove corresponding to the connecting piece, and the connecting piece is connected to the corresponding mounting groove by screws.

[0019] The connecting piece and the mounting groove are arranged so that the sleeve grab can be stably connected to the front end of the outer tube.

[0020] Preferably, the elastic sheet is an aluminum sheet.

[0021] Preferably, it also includes a fracturing ball, which is used to seal a bridge plug that has been set downhole, and the mass of the fracturing ball is greater than the mass of the data acquisition ball.

[0022] The fracturing ball reaches the set bridge plug before the data collection ball to seal it, and the ball receiver can collect fracturing data.

[0023] Preferably, the ball receiver is arranged at the front end of the tool string used for fracturing, and can be lowered into the well together with the tool string for setting the bridge plug during the next stage of fracturing, thereby avoiding adding operation procedures other than fracturing.

[0024] Preferably, the outer diameter of the data acquisition ball is smaller than the minimum size of the inner channel of the sealed bridge plug, and can be discharged from the sealed bridge plug in the next stage, avoiding the need for the ball receiver to pass through the sealed bridge plug, thereby increasing the internal flow channel of the ball receiver and facilitating the reception of the data acquisition ball.

[0025] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0026] 1. In the downhole data acquisition system of the utility model, after the data acquisition ball collects data in the well, it is lowered into the well through the ball receiver to be recovered and taken out of the well. Therefore, there is no need to perform wireless transmission in the well, thus avoiding the influence of the complex well fluid environment on data transmission, making it more applicable.

[0027] 2. In the downhole data acquisition system of the utility model, the ball receiver includes an outer tube and a sleeve grip. The inner flow channel of the outer tube is large and the resistance is small. During backflow, the well fluid will preferentially pass through the inner flow channel of the outer tube, thereby driving the data acquisition ball to more accurately squeeze the elastic sheet of the sleeve grip and enter the outer tube. After the data acquisition ball enters the outer tube, the elastic sheet will rebound and return to its original position, thereby preventing the data acquisition ball from falling out of the outer tube.

[0028] 3. The downhole data acquisition system of the utility model also includes a fracturing ball. The fracturing ball reaches the sealed bridge plug of the first stage before the data acquisition ball to seal it. The data acquisition ball can collect the fracturing data of the first stage. The ball receiver is arranged at the front end of the tool string used for fracturing in the second stage, and can be lowered into the well together with the tool string for sealing the bridge plug during the fracturing in the second stage. The outer diameter of the data acquisition ball is smaller than the minimum size of the inner channel of the sealed bridge plug in the second stage, and can be discharged from the sealed bridge plug in the second stage, avoiding the need for the ball receiver to pass through the sealed bridge plug, thereby increasing the internal flow channel of the ball receiver and facilitating the reception of the data acquisition ball. The temperature and pressure data of the first stage fracturing collected by the data acquisition ball in the first stage are recovered through the fracturing operation in the second stage, avoiding the addition of operation procedures other than fracturing, avoiding the increase of construction period, and saving operation costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram showing that the fracturing ball and the data acquisition ball are successively lowered into the well;

[0030] Figure 2 It is a schematic diagram of the data collection ball collecting data when the fracturing ball seals the set bridge plug;

[0031] Figure 3 It is a schematic diagram of lowering the tool string and the ball receiver and returning the flow in the well so that the data acquisition ball enters the ball receiver;

[0032] Figure 4 It is a diagram of pulling out the tool string and ball catcher;

[0033] Figure 5 It is a schematic diagram of lowering a new fracturing ball and a data acquisition ball into the well one after another;

[0034] Figure 6 is a schematic diagram of the data collection ball collecting data when a new fracturing ball seals a new set bridge plug;

[0035] Figure 7 It is a schematic diagram of the structure of the ball receiver;

[0036] Figure 8 yes Figure 7 Right view of;

[0037] Fig. 9 yes Figure 7 Left view of

[0038] Fig.10 It is a schematic diagram of the structure of the catching;

[0039] Fig.11 yes Fig.10 Right view of;

[0040] Fig.12 yes Fig.10 Front view of

[0041] Fig.13 It is a schematic diagram of the structure of the collection ball;

[0042] Icons: 1-data acquisition ball; 11-cover; 12-housing; 13-detection channel; 14-pressure sensor; 15-data storage device; 16-temperature sensor; 17-first sealing O-ring; 18-second sealing O-ring; 2-bridge plug; 21-inner channel; 3-fracturing ball; 4-oil pipe; 5-tool string; 6-ball receiver; 61-outer cylinder; 611-installation groove; 62-catch; 621-support ring; 622-connecting plate; 623-elastic plate; 624-screw hole; 7-cable. DETAILED DESCRIPTION

[0043] The utility model is described in detail below in conjunction with the accompanying drawings.

[0044] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0045] Example 1

[0046] This embodiment provides a downhole data acquisition system. Figure 1 and Figure 2 , comprising a data acquisition ball 1 and a ball receiver 6, wherein a pressure sensor 14 and a temperature sensor 16 are arranged in the data acquisition ball 1, and the pressure sensor 14 and the temperature sensor 16 can respectively collect data in the well and store the data in the data acquisition ball 1;

[0047] The ball receiver 6 can be lowered into the well via a cable 7 to retrieve the data acquisition ball 1 .

[0048] The method of setting the pressure sensor 14 and the temperature sensor 16 in the data acquisition ball 1 is a prior art, which can detect and store the pressure and temperature in the well. Fig.13As shown, the data acquisition ball 1 is provided with a detection channel 13 extending from its outer side only to the pressure sensor 14. The data acquisition ball 1 includes a shell 12 and a cover 11, the cover 11 is sealed and connected to the opening of the shell 12 to form a cavity, and the pressure sensor 14 and the temperature sensor 16 are both arranged in the cavity; the detection channel 13 is provided on the cover 11, and the pressure sensor 14 is arranged close to the cover 11 and blocks the detection channel 13; the cover 11 and the shell 12 are threadedly connected, and a first sealing O-ring 17 is provided at the threaded connection between the cover 11 and the shell 12; the pressure sensor 14 is partially embedded in the cover 11, and a second sealing O-ring 18 is provided at the contact between the pressure sensor 14 and the cover 11; the shell 12 and the cover 11 are both It is an aluminum component; the cover 11 and the shell 12 are both coaxially arranged rotating bodies, the pressure sensor 14 and the temperature sensor 16 are both distributed along the central axis of the cover 11, and the pressure sensor 14 and the temperature sensor 16 are respectively symmetrically arranged about the central axis of the cover 11; a data storage device 15 is also provided in the cavity, the data storage device 15 is distributed along the central axis of the cover 11, and the data storage device 15 is symmetrically arranged about the central axis of the cover 11, the pressure sensor 14 and the temperature sensor 16 are respectively communicatively connected to the data storage device 15; the data storage device 15 is located between the pressure sensor 14 and the temperature sensor 16.

[0049] With the downhole data acquisition system described in this scheme, after the data acquisition ball 1 collects data in the well, it is lowered into the well through the ball receiver 6 to be recovered and taken out of the well. Therefore, there is no need for wireless transmission in the well, avoiding the influence of the complex well fluid environment on data transmission, making it more applicable.

[0050] In this embodiment, the temperature and pressure data of the well fracturing may be collected. Figure 1-Figure 6 As shown, the downhole data acquisition system further includes a fracturing ball 3, which is used to plug the downhole bridge plug 2. The method of plugging the downhole bridge plug 2 with the fracturing ball 3 is the prior art. The mass of the fracturing ball 3 is greater than the mass of the data acquisition ball 1, so that the fracturing ball 3 reaches the set bridge plug 2 before the data acquisition ball 1 to plug it. Figure 1 and Figure 2 As shown, the ball receiver 6 is capable of collecting fracturing data.

[0051] In this embodiment, the ball receiver 6 can be arranged at the front end of the tool string 5 used for fracturing, and can be lowered into the well together with the tool string 5 for setting the bridge plug 2 in the next stage of fracturing. Figure 3 As shown, the operation steps other than fracturing are avoided, and the lowering and pulling back of the tool string 5 are both existing technologies.

[0052] In this embodiment, Figure 7-Figure 9 As shown, the ball receiver 6 includes an outer cylinder 61 and a sleeve catch 62. The sleeve catch 62 is installed at the front end of the outer cylinder 61 and can be opened and closed. By opening the sleeve catch 62, the data acquisition ball 1 after data acquisition can be recovered into the outer cylinder 61. After the sleeve catch 62 is closed, the data acquisition ball 1 will not fall out of the outer cylinder 61, and can be taken out of the well through the ball receiver 6. Figure 4 shown.

[0053] This embodiment provides a better form of the casing 62, which can be opened and closed by using the well fluid backflow. Figure 10-12 As shown, the sleeve grab 62 includes a support ring 621 and a plurality of elastic sheets 623. The support ring 621 is coaxially arranged with the outer tube 61, and the support ring 621 is installed at the front end of the outer tube 61. All the elastic sheets 623 are arranged at intervals on the inner side of the support ring 621. All the elastic sheets 623 are arranged obliquely to the axial direction of the outer tube 61 and are arranged inside the outer tube 61. The number of the elastic sheets 623 can be selected according to actual needs. Figure 8 Six elastic sheets 623 are arranged in the middle, but all the elastic sheets 623 are evenly arranged in the circumferential direction, and are more evenly squeezed by the data acquisition ball 1. The elastic sheets 623 can be made of materials with certain recovery ability such as aluminum, and can work in the well fluid. When the sleeve catch 62 is closed, the elastic sheets 623 are not completely closed, and there are flow channels provided for the well fluid to return, which can achieve drainage.

[0054] When not squeezed, the space between the tail ends of all the elastic sheets 623 is smaller than the data acquisition ball 1. When the well fluid is flowing back, Figure 3 As shown, the well fluid will push the data acquisition ball 1 to squeeze the elastic sheet 623, and then stretch the elastic sheet 623, so that the data acquisition ball 1 enters the outer cylinder 61. After the data acquisition ball 1 enters the outer cylinder 61, the elastic sheet 623 will rebound and return to its original position. Since the space between the tail ends of all the elastic sheets 623 is smaller than the data acquisition ball 1, the data acquisition ball 1 will not fall out of the outer cylinder 61. As a preferred option, all the elastic sheets 623 are obliquely intersected with the axial direction of the outer cylinder 61 by 30°-60°, which is convenient for the deformation and rebound of the elastic sheet 623 and the setting of the size of the elastic sheet 623.

[0055] like Figure 7-Figure 12As shown, the sleeve grip 62 further includes a plurality of connecting pieces 622, all of which are arranged at intervals along the circumferential direction on the outside of the support ring 621, and all of which are arranged radially; the front end of the outer cylinder 61 is provided with a mounting groove 611 corresponding to the connecting piece 622, and the connecting piece 622 and the mounting groove 611 have corresponding screw holes 624, and the connecting piece 622 is connected to the corresponding mounting groove 611 by screws. The number of connecting pieces 622 and mounting grooves 611 is selected according to actual needs, and the connecting pieces 622 and mounting grooves 611 are provided so that the sleeve grip 62 can be stably connected to the front end of the outer cylinder 61.

[0056] In this embodiment, the data acquisition ball 1 uses a lighter material and mass, making the data acquisition ball 1 easier to reflux, but it is also necessary to consider its ability to work normally in the well fluid to ensure that the temperature sensor 16 and the pressure sensor 14 can be tested normally. At the same time, its wall thickness needs to be considered and needs to meet the corresponding strength.

[0057] Using the downhole data acquisition system of the utility model, if Figure 1-Figure 2 As shown, the fracturing ball 3 reaches the first stage of the set bridge plug 2 before the data acquisition ball 1 to seal it, and the data acquisition ball 1 can collect the fracturing data of the first stage; Figure 3 As shown, the ball receiver 6 is arranged at the front end of the tool string 5 used in the second stage of fracturing, and can be lowered into the well together with the tool string 5 for sealing the bridge plug 2 during the second stage of fracturing. The tool string 5 realizes the sealing of the bridge plug 2 in the second stage and starts to return the well fluid. The outer diameter of the data acquisition ball 1 is smaller than the minimum size of the inner channel 21 of the bridge plug 2 that has been sealed in the second stage, and can be returned from the sealed bridge plug 2 in the second stage, avoiding the need for the ball receiver 6 to pass through the sealed bridge plug 2, thereby increasing the internal flow channel of the ball receiver 6, and facilitating the reception of the data acquisition ball 1. The radial area of ​​the internal flow channel of the outer tube 61 of the ball receiver 6 is larger than the radial area between the outer tube 61 and the oil pipe 4, so that the internal flow channel of the outer tube 61 is large and the resistance is small. When returning, the well fluid will preferentially pass through the internal flow channel of the outer tube 61, thereby driving the data acquisition ball 1 to enter the outer tube 61 more accurately; the tool string 5 returns to the outside of the well with the ball receiver 6 that has recovered the data acquisition ball 1, as shown in FIG. Figure 4 As shown, the temperature and pressure data of the first stage fracturing collected by the data collection ball 1 in the first stage are recovered through the second stage fracturing operation, thereby avoiding adding operation procedures other than fracturing, avoiding increasing the construction period, and saving operation costs. Figure 5 As shown, if the second stage of fracturing data needs to be detected, a new fracturing ball 3 and a data acquisition ball 1 are put in order to form Figure 5-Figure 6 Cycle detection job in .

[0058] Through the bridge plug 2 perforation and fracturing process, the data acquisition ball with built-in temperature and pressure sensors collects the downhole temperature and pressure data throughout the process and completes the recovery. This method has higher feasibility and lower technical requirements and working conditions, and can collect and collect downhole data at a lower cost and more efficiently.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A downhole data acquisition system, characterized in that: It comprises a data acquisition ball (1) and a ball receiver (6), wherein a pressure sensor (14) and a temperature sensor (16) are arranged inside the data acquisition ball (1), and the pressure sensor (14) and the temperature sensor (16) can respectively acquire data in the well inside the data acquisition ball (1) and store the data; The ball receiver (6) can be lowered into the well via a cable (7) to retrieve the data acquisition ball (1).

2. The downhole data acquisition system according to claim 1, characterized in that: The ball receiver (6) comprises an outer tube (61) and a sleeve grip (62). The sleeve grip (62) is installed at the front end of the outer tube (61), and the sleeve grip (62) can be opened and closed.

3. The downhole data acquisition system according to claim 2, characterized in that: The radial area of ​​the internal flow channel of the outer cylinder (61) is larger than the radial area between the outer cylinder (61) and the oil pipe (4).

4. The downhole data acquisition system according to claim 2, characterized in that: The sleeve grab (62) comprises a support ring (621) and a plurality of elastic sheets (623); the support ring (621) is coaxially arranged with the outer tube (61); the support ring (621) is installed at the front end of the outer tube (61); all the elastic sheets (623) are arranged at intervals on the inner side of the support ring (621); and all the elastic sheets (623) are arranged obliquely to the axial direction of the outer tube (61) and are arranged inside the outer tube (61); When not squeezed, the space between the tail ends of all the elastic sheets (623) is smaller than that of the data acquisition ball (1).

5. The downhole data acquisition system according to claim 4, characterized in that: All of the elastic sheets (623) are obliquely intersected with the axial direction of the outer cylinder (61) by 30°-60°.

6. The downhole data acquisition system according to claim 4, characterized in that: The sleeve gripper (62) further comprises a plurality of connecting pieces (622), all of the connecting pieces (622) are arranged at intervals along the circumferential direction on the outer side of the supporting ring (621), and all of the connecting pieces (622) are arranged radially; The front end of the outer cylinder (61) is provided with a mounting groove (611) corresponding to the connecting piece (622), and the connecting piece (622) is connected to the corresponding mounting groove (611) by means of screws.

7. The downhole data acquisition system according to claim 4, characterized in that: The elastic sheet (623) is an aluminum sheet.

8. The downhole data acquisition system according to any one of claims 1 to 7, characterized in that: It also comprises a fracturing ball (3), which is used to seal a bridge plug (2) that has been set downhole, and the mass of the fracturing ball (3) is greater than the mass of the data acquisition ball (1).

9. The downhole data acquisition system according to claim 8, characterized in that: The ball receiver (6) is arranged at the front end of the tool string (5) used for fracturing.

10. The downhole data acquisition system according to claim 8, characterized in that: The outer diameter of the data acquisition ball (1) is smaller than the minimum size of the inner channel (21) of the set bridge plug (2).

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