Intelligent self-floating well leakage point detection device and well leakage point detection method

Abstract

The invention discloses an intelligent self-floating well leakage point detection device and a well leakage point detection method. The device comprises a detection short section and a self-floating short section, the detection short section and the self-floating short section are detachably connected up and down; the self-floating short section is hollow; the detection short section is provided with a temperature detection device, a pressure sensing device, a control circuit chip and a battery; the battery is used for supplying power to the temperature detection device, the pressure sensing device and the control circuit chip; the pressure sensing device is used for collecting pressure of each point in the shaft and transmitting the pressure to the control circuit chip for storage; and the temperature detection device is used for collecting corresponding temperature values and transmitting the temperature values to the control circuit chip for storage. According to the intelligent self-floating well leakage point detection device, the change of the well temperature near the leakage point is detected, then the position of the leakage point is detected, and the leakage point searching accuracy and the leakage stopping efficiency are greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical fields of geothermal energy and oil and gas drilling, and particularly relates to an intelligent self-floating well leakage point detection device and a method for detecting well leakage points. Background Art

[0002] With the continuous deepening of oilfield exploration and development, there are more and more deep wells and complex wells. During the drilling process, due to the mismatch between engineering parameters and formations, well leakage often occurs. In order to plug the leakage efficiently, determining the location of the leakage point is the key. At present, there are few methods for determining the leakage point, mainly including leak testing and electrical logging, etc. Leak testing has uncertainties, and electrical logging takes a long time and has low efficiency. Summary of the Invention

[0003] In view of the above problems, the present invention is proposed to provide an intelligent self-floating well leakage point detection device and a method for detecting well leakage points that overcome the above problems or at least partially solve the above problems.

[0004] In a first aspect, an embodiment of the present invention provides an intelligent self-floating well leakage point detection device, including:

[0005] A detection sub-section and a self-floating sub-section;

[0006] The detection sub-section and the self-floating sub-section are detachably connected up and down;

[0007] The self-floating sub-section is hollow;

[0008] The detection sub-section is provided with a temperature detection device, a pressure sensing device, a control circuit chip and a battery; the battery is used to supply power to the temperature detection device, the pressure sensing device and the control circuit chip;

[0009] The pressure sensing device is used to collect the pressures at each point experienced in the wellbore during the upward buoyancy rise process of the intelligent self-floating well leakage point detection device in the wellbore, and transmit them to the control circuit chip for storage;

[0010] The temperature detection device is used to collect the corresponding temperature values during the upward buoyancy rise process of the intelligent self-floating well leakage point detection device in the wellbore, and transmit them to the control circuit chip for storage. The temperature detection device is a thermistor resistance sensor;

[0011] The pressure sensing device is a piezoresistive resistance sensor.

[0012] In one embodiment, the detection sub-section is in the shape of a hexagonal cylinder with a cavity inside, and the battery and the control circuit chip are arranged in the cavity;

[0013] The thermistor resistance sensor and the piezoresistive resistance sensor are respectively arranged on the outer surface of the detection sub-section.

[0014] In one embodiment, the thermistor sensor and the piezoresistive sensor are sheet-shaped;

[0015] On two opposite faces of the detection sub-section, a thermistor mounting groove and a piezoresistive mounting groove are respectively formed;

[0016] The piezoresistive sensor is disposed in the piezoresistive mounting groove;

[0017] The thermistor sensor is disposed in the thermistor mounting groove.

[0018] In one embodiment, the thermistor sensor is welded in the thermistor mounting groove.

[0019] In one embodiment, the piezoresistive mounting groove has two levels of steps;

[0020] The piezoresistive sensor is fixed on a first-level step of the piezoresistive mounting groove by a pin for detecting the pressure in the wellbore;

[0021] In the second-level step of the piezoresistive mounting groove, a rubber isolation pad and a rubber isolation pad pressing plate are provided. The rubber isolation pad pressing plate presses on the rubber isolation pad, and the rubber isolation pad is fixed on the second-level step of the piezoresistive mounting groove by a rubber isolation pad pin for protecting the piezoresistive sensor and transmitting pressure to the piezoresistive sensor to cause it to strain, thereby changing its resistance value.

[0022] In one embodiment, the self-floating sub-section is a hollow cylindrical shape, with threads machined at the top for connection with the detection sub-section, and sealed by a floating sub-section sealing cover at the bottom for providing buoyancy for the device to float upward.

[0023] In one embodiment, the control circuit chip includes an SD card for storing the pressure value collected by the piezoresistive sensor and the temperature value collected by the thermistor sensor.

[0024] In one embodiment, the piezoresistive sensor and the thermistor sensor are connected to a battery and a control circuit chip through wires.

[0025] In a second aspect, an embodiment of the present invention provides a method for detecting a well leakage point, including:

[0026] Using the intelligent self-floating well leakage point detection device as described above to collect the pressure value and the corresponding temperature value at each point in the wellbore; the pressure value corresponds to the well depth;

[0027] If an abnormal section of the temperature value is monitored, determine the pressure value range corresponding to the section;

[0028] Determine the depth where the section is located according to the pressure value range of the section.

[0029] The beneficial effects of the above technical solutions provided by the embodiments of the present invention at least include:

[0030] The intelligent self-floating well leakage point detection device and the well leakage point detection method provided by the embodiments of the present invention can detect the change of the well temperature near the leakage point through the intelligent self-floating well leakage point detection device, and then detect the position of the leakage point, greatly improving the accuracy of leakage point search and the plugging efficiency.

[0031] Other features and advantages of the present invention will be described in the subsequent description, and, in part, will be obvious from the description, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained by the structures specifically pointed out in the written description, claims, and drawings.

[0032] The technical solutions of the present invention will be further described in detail below through the drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings are used to provide a further understanding of the present invention, and constitute a part of the description. They are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the drawings:

[0034] Figure 1A-1B is the overall schematic diagram of the intelligent self-floating well leakage point detection device in the embodiment of the present invention;

[0035] Figure 2 is the sectional view in the A-A direction of the intelligent self-floating well leakage point detection device in the embodiment of the present invention;

[0036] Figures 3A-3C is the related structural schematic diagram of the thermistor sensor and the piezoresistive sensor in the embodiment of the present invention;

[0037] Figure 4 is the structural schematic diagram of the rubber isolation pad in the embodiment of the present invention;

[0038] Figure 5 is the structural schematic diagram of the pressing plate of the rubber isolation pad in the embodiment of the present invention;

[0039] Figures 6A-6C is the structural schematic diagram of the self-floating short joint in the embodiment of the present invention, where Figure 6C is the sectional view in the A-A direction of the self-floating short joint in the embodiment of the present invention;

[0040] Figure 7 is the structural schematic diagram of the floating short joint sealing cover in the embodiment of the present invention;

[0041] Figure 8 Schematic diagram of circuit components in a control circuit chip;

[0042] Figures 9A-9B Schematic diagrams of the structures of a battery and a control circuit chip respectively;

[0043] Figure 10 Schematic diagram of the structure of a piezoresistive resistor sensor in the shape of a sheet.

[0044] Explanation of reference numerals:

[0045] 1. Detection sub-section; 2. Self-floating sub-section; 11. Thermistor mounting groove; 12. Thermistor sensor; 13. Piezoresistive resistor mounting groove; 14. Pin; 15. Thread; 16. Rubber isolation pad; 17. Rubber isolation pad pressing plate; 18. Piezoresistive resistor sensor; 19. Battery; 110. Control circuit chip; 22. Self-floating sub-section sealing cover. Detailed implementation manners

[0046] Hereinafter, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be completely conveyed to those skilled in the art.

[0047] The inventors of the present application found that when well leakage occurs, the wellbore fluid enters the formation, causing a change in the formation temperature and an abnormality in the temperature of the relatively upper and lower non-leaking formations.

[0048] Therefore, in order to quickly determine the leakage point location for efficient plugging, it is necessary to develop an intelligent self-floating well leakage point detection device that can intelligently detect the temperature change in the wellbore, mark the well leakage point, and at the same time can intelligently detect the pressure change in the wellbore, combine with the actual drilling trajectory, and combine with the temperature detection to determine the temperature anomaly point, thereby inversely inferring to determine the location of the well leakage point and increasing the plugging efficiency.

[0049] Based on this idea, an intelligent self-floating well leakage point detection device is proposed and will be described in detail below with reference to the accompanying drawings.

[0050] The intelligent self-floating well leakage point detection device provided by the embodiment of the present invention, referring to Figure 1A , Figure 1B as shown, includes:

[0051] A detection sub-section 1 and a self-floating sub-section 2;

[0052] The detection sub-section 1 and the self-floating sub-section 2 are detachably connected up and down;

[0053] The self-floating nipple 2 is hollow;

[0054] Referring to Figure 2 as shown, the detection nipple 1 is provided with a temperature detection device, a pressure sensing device, a control circuit chip 110 and a battery 19; the battery 19 is used to supply power to the temperature detection device, the pressure sensing device and the control circuit chip 110;

[0055] The pressure sensing device is used to collect the pressure at each point experienced in the wellbore and transmit it to the control circuit chip for storage during the upward buoyancy rise of the intelligent self-floating well leakage point detection device in the wellbore;

[0056] The temperature detection device is used to collect the corresponding temperature value and transmit it to the control circuit chip for storage during the upward buoyancy rise of the intelligent self-floating well leakage point detection device in the wellbore.

[0057] Referring to Figure 2 、 Figure 9A and Figure 9B as shown, both the battery 19 and the control circuit chip 110 are cylindrical, which is convenient for being arranged in the cavity of the detection nipple 1.

[0058] In one embodiment, the above temperature detection device can be, for example, a thermistor sensor 12;

[0059] The thermistor sensor 12 is a conversion device that converts temperature into an electrical signal.

[0060] The above pressure sensing device can be, for example, a piezoresistive sensor 18;

[0061] The piezoresistive sensor 18 is a sensor that measures based on the principle that the resistance value changes with the applied pressure.

[0062] In one embodiment, referring to Figure 2 as shown, the detection nipple 1 is hexagonal prism-shaped with a cavity inside, and the battery 19 and the control circuit chip 110 are arranged in the cavity;

[0063] The thermistor sensor 12 and the piezoresistive sensor 18 are respectively arranged on the outer surface of the detection nipple 1.

[0064] In one embodiment, the thermistor sensor 12 and the piezoresistive sensor 18 are respectively arranged on two opposite faces of the hexagonal prism, which can avoid interference between the two sensors and is also convenient for wiring.

[0065] Referring to Figure 3A 、 Figure 3B and Figure 3C as shown, both the thermistor sensor 12 and the piezoresistive sensor 18 are sheet-shaped;

[0066] On two opposite faces of the detection sub-section 1, a thermal resistance mounting groove 11 and a piezoresistive resistance mounting groove 13 are respectively provided.

[0067] The piezoresistive resistance sensor 18 is arranged in the piezoresistive resistance mounting groove 13.

[0068] The thermal resistance sensor 12 is arranged in the thermal resistance mounting groove 11.

[0069] In one embodiment, the above-mentioned thermal resistance sensor 12 is welded in the thermal resistance mounting groove 11.

[0070] In one embodiment, two levels of steps are provided in the piezoresistive resistance mounting groove 13.

[0071] The piezoresistive resistance sensor 18 is fixed on the first-level step of the piezoresistive resistance mounting groove 13 through a pin 14 for detecting the pressure in the wellbore.

[0072] In the second-level step of the piezoresistive resistance mounting groove 13, a rubber isolation pad 16 and a rubber isolation pad pressing plate 17 are arranged. The rubber isolation pad pressing plate 17 presses on the rubber isolation pad 16, and the rubber isolation pad 16 is fixed on the second-level step of the piezoresistive resistance mounting groove 13 through a rubber isolation pad pin 14, which is used to protect the piezoresistive resistance sensor 18 and transmit pressure to the piezoresistive resistance sensor 18 to cause it to strain, thereby changing its resistance value.

[0073] Refer to Figure 10 As shown, the piezoresistive resistance sensor 18 is sheet-shaped and provided with pin holes.

[0074] Among the above two levels of steps, the second-level step is outside the first-level step.

[0075] Figure 4 Shown is the rubber isolation pad 16. Figure 5 Shown is the structural schematic diagram of the rubber isolation pad pressing plate 17.

[0076] Pin holes are provided in the rubber isolation pad 16 and the rubber isolation pad pressing plate 17, and the two are fixed on the outer surface of the detection sub-section 1 through a pin 14.

[0077] In one embodiment, refer to Figures 6A-6C 、 Figure 7 As shown, a thread 15 is provided at the bottom of the detection sub-section 1. The self-floating sub-section 2 is a hollow cylindrical shape, with a thread 15 turned on the top for threaded connection with the detection sub-section 1, and the bottom is sealed by a self-floating sub-section sealing cover 22, which is used to provide the buoyancy for the intelligent self-floating well leakage point detection device to float.

[0078] Further, the control circuit chip includes an SD card for storing the pressure values collected by the piezoresistive sensor and the temperature values collected by the thermistor sensor 12.

[0079] In one embodiment, the piezoresistive sensor 18 and the thermistor sensor 12 are connected to the battery 19 and the control circuit chip 110 through wires.

[0080] During the use of the intelligent self-floating well leakage point detection device, since the self-floating sub-section 2 is a sealed cylindrical shape with a hollow interior, it can provide good buoyancy. In the wellbore, it rises by its own buoyancy. During the rising process, it experiences temperature and pressure changes. The control circuit chip can collect a series of temperature-pressure value data. When the intelligent self-floating well leakage point detection device is salvaged, the position of the data with abnormal temperature fluctuations (where well leakage may occur) can be monitored based on the stored temperature and pressure data, and its pressure range can be determined. Combining with the actual drilling trajectory, the actual position where the well leakage occurs can be inferred.

[0081] An example of a control circuit chip can be referred to Figure 8 as shown. In this example, 80C51 is a single-chip microcomputer, and SD1 is a single-chip microcomputer. In this circuit diagram, it also includes a thermistor sensor, a piezoresistive sensor, and a corresponding analog-to-digital conversion device (ADC8032). These components are all connected to the corresponding pins of the single-chip microcomputer.

[0082] The installation steps of the above intelligent self-floating well leakage point detection device can be, for example, the following process:

[0083] 1. Weld the thermistor sensor to the thermistor installation groove 12;

[0084] 2. Fix the piezoresistive sensor to the first-level step of the piezoresistive resistance installation groove 13 through a pin 14;

[0085] 3. Fix the rubber isolation pad 16 to the second-level step of the piezoresistive resistance installation groove 13 through the rubber isolation pad pressing plate 17 with a pin 14;

[0086] 4. Write a program on the single-chip microcomputer. This program is used to collect the pressure signal collected by the piezoresistive sensor 18 and the temperature signal collected by the thermistor sensor 12, convert them into data signals, and write them into the SD card of the control circuit chip for storage;

[0087] 5. Place the battery and the control circuit chip in the detection sub-section 1;

[0088] 6. Connect the self-floating sub-section 2 to the detection sub-section 1 through a thread 15.

[0089] Based on the same inventive concept, an embodiment of the present invention further provides a method for detecting the leakage point of well leakage, including the following steps:

[0090] Use the intelligent self-floating well leakage point detection device as described above to collect the pressure values and corresponding temperature values at each point in the wellbore; the pressure values correspond to the well depth;

[0091] If an abnormal section of temperature value is monitored, determine the range of pressure values corresponding to the section;

[0092] According to the range of pressure values of the section, determine the depth where the section is located.

[0093] The implementation of this device can refer to the implementation of the foregoing method, and the repeated parts will not be described again.

[0094] The intelligent self-floating well leakage point detection device and the method for detecting the well leakage point provided by the embodiment of the present invention can detect the change of the well temperature near the leakage point through the intelligent self-floating well leakage point detection device, and then detect the position of the leakage point, greatly improving the accuracy of leakage point search and the efficiency of plugging leakage.

[0095] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) containing computer-usable program code.

[0096] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram can be implemented by computer program instructions, and the combination of the processes and / or blocks in the flowchart and / or block diagram can also be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for realizing the functions specified in one or more processes in the flowchart and / or one or more blocks in the block diagram.

[0097] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured product including an instruction device, and the instruction device realizes the functions specified in one or more processes in the flowchart and / or one or more blocks in the block diagram.

[0098] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus, so that a series of operation steps are executed on the computer or other programmable apparatus to produce a computer-implemented process, thereby the instructions executed on the computer or other programmable apparatus provide steps for implementing the functions specified in one process or more processes of the flowchart and / or one block or more blocks of the block diagram.

[0099] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. An intelligent self-floating well leakage point detection device, characterized in that, Comprising: A detection sub-section and a self-floating sub-section; The detection sub-section and the self-floating sub-section are detachably connected up and down; The self-floating sub-section is hollow; The detection sub-section is provided with a temperature detection device, a pressure sensing device, a control circuit chip and a battery; the battery is used to supply power to the temperature detection device, the pressure sensing device and the control circuit chip; The pressure sensing device is used to collect the pressures at each point experienced in the wellbore during the upward floating process of the intelligent self-floating well leakage point detection device in the wellbore, and transmit them to the control circuit chip for storage; The temperature detection device is used to collect the corresponding temperature values during the upward floating process of the intelligent self-floating well leakage point detection device in the wellbore, and transmit them to the control circuit chip for storage.

2. The device according to claim 1, characterized in that, The temperature detection device is a thermistor sensor; The pressure sensing device is a piezoresistive resistor sensor.

3. The device according to claim 1, characterized in that The detection sub-section is in the shape of a hexagonal cylinder with a cavity inside, and the battery and the control circuit chip are arranged in the cavity; The thermistor sensor and the piezoresistive resistor sensor are respectively arranged on the outer surface of the detection sub-section.

4. The device according to claim 3, characterized in that The thermistor sensor and the piezoresistive resistor sensor are in sheet shape; On two opposite surfaces of the detection sub-section, a thermistor installation groove and a piezoresistive resistor installation groove are respectively opened; The piezoresistive resistor sensor is arranged in the piezoresistive resistor installation groove; The thermistor sensor is arranged in the thermistor installation groove.

5. The device according to claim 4, characterized in that, The thermistor sensor is welded in the thermistor installation groove.

6. The device according to claim 4, characterized in that, The piezoresistive resistor installation groove has two levels of steps; The piezoresistive resistor sensor is fixed on the first-level step of the piezoresistive resistor installation groove by a pin for detecting the pressure in the wellbore; In the second-level step of the piezoresistive resistor installation groove, a rubber isolation pad and a rubber isolation pad pressing plate are arranged. The rubber isolation pad pressing plate presses on the rubber isolation pad, and the rubber isolation pad is fixed on the second-level step of the piezoresistive resistor installation groove by a rubber isolation pad pin for protecting the piezoresistive resistor sensor and transmitting pressure to the piezoresistive resistor sensor to cause it to strain and thus change its resistance value.

7. The device according to any one of claims 1-6, characterized in that, The self-floating sub-section is in the shape of a hollow cylinder, with threads turned on the top to be connected to the detection sub-section, and the bottom is sealed by a floating sub-section sealing cover with threads for providing buoyancy for the device to float upward.

8. The device according to any one of claims 2-6, characterized in that, The control circuit chip contains an SD card for storing the pressure values collected by the piezoresistive resistor sensor and the temperature values collected by the thermistor sensor.

9. The device according to any one of claims 2-6, characterized in that The piezoresistive resistor sensor and the thermistor are connected to the battery and the control circuit chip through wires.

10. A method for detecting the leakage point of well leakage, characterized in that, Comprising: Using the intelligent self-floating well leakage point detection device according to any one of claims 1-8 to collect the pressure values and the corresponding temperature values at each point in the wellbore; The pressure values correspond to the well depth; If an abnormal section of temperature values is monitored, determine the pressure value range corresponding to the section; According to the pressure value range of the section, determine the depth where the section is located.

Images