Integrated logging tool and method for collecting logging data

Abstract

The application provides an integrated integrated logging instrument and a logging data acquisition method, and relates to the technical field of oil logging. The integrated integrated logging instrument comprises, in sequence, a motor eccentric, a common circuit section neutron source assembly, a pusher, a caliper assembly and a density sensor assembly, and the neutron source assembly, the pusher, the caliper assembly and the density sensor assembly are further electrically connected with the common circuit section; wherein the neutron signal processing unit of the neutron source assembly, the neutron receiving module of the neutron source assembly and the main processing unit composed of the coding unit of the neutron source assembly and the coding unit of the density sensor assembly are integrally arranged in the common circuit section. The integrated integrated logging instrument and the logging data acquisition method optimize the circuit layout of the logging instrument, shorten the length of the neutron source assembly and the density sensor assembly, and solve the problems of the overall length of the logging instrument being too long and poor reliability in the prior art.

Description

Technical Field

[0001] This invention relates to the field of oil well logging technology, specifically to an integrated well logging instrument and a well logging data acquisition method. Background Technology

[0002] Radioactive logging is a geophysical method used to study the geological profile of drilling, locate oil and gas reservoirs, and study oil and gas well engineering based on the nuclear physical properties of rocks and media. In recent years, the oil and gas field development market has combined different types of logging instruments to form integrated radioactive logging instruments. With increasingly stringent requirements for construction safety, logging instruments are developing towards lightweight, miniaturized, and integrated designs. To evaluate complex geological conditions, obtain more stratigraphic information in a single well run, and improve the utilization rate of logging instruments in terms of length, there is an urgent need to develop an integrated logging sensor structure capable of compensating for neutrons and measuring lithological density.

[0003] Currently, neutron logging sensors are used to measure formation porosity, while density logging sensors can obtain formation density information and thus determine formation porosity. Therefore, a combination of compensated neutron and lithological density instruments is typically used in well operations. However, the combined structure of the aforementioned neutron and density logging sensors simply involves rigidly connecting two independent instruments, often resulting in drawbacks such as complex field installation, excessively long connection lengths, low reliability, and compromised safety.

[0004] Therefore, there is an urgent need for a device to solve at least one of the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide an integrated logging tool and logging data acquisition method to solve the problems of excessive overall length and poor reliability of existing logging tools.

[0006] To achieve the above objectives, the present invention provides an integrated logging tool electrically connected to a surface host. The integrated logging tool includes: an electric eccentric, a neutron source component in a common circuit section, a pusher, a caliper component, and a density sensor component, which are mechanically connected in sequence. The neutron source component, pusher, caliper component, and density sensor component are also electrically connected to the common circuit section. The main processing unit, consisting of the neutron signal processing unit of the neutron source component, the neutron receiving module of the neutron source component, and the encoding unit of the neutron source component and the encoding unit of the density sensor component, is integrated in the common circuit section.

[0007] Specifically, the electric eccentric is used to provide balancing forces to the neutron source assembly and the density sensor assembly; The pusher is used to drive the density sensor assembly to fit against the well wall during logging; The borehole diameter assembly is used to detect the borehole diameter; The neutron source assembly includes a neutron emission source and a neutron receiving module. Fast neutrons emitted by the neutron emission source are elastically scattered with the atomic nuclei of the formation medium and decelerated into thermal neutrons. The thermal neutrons are received by the neutron receiving module and the corresponding neutron electrical signals are output to the neutron signal processing unit of the common circuit section. The density sensor assembly includes a density emission source, a density receiving module, and a digital processing module. The density emission source emits gamma rays into the formation, the density receiving module receives the gamma rays that undergo the Doppler effect in the formation, and the digital processing module converts and processes the gamma rays that undergo the Doppler effect to obtain a density pulse signal and outputs it to the main processing unit of the common circuit segment. The common circuit segment is electrically connected to the ground host. The neutron signal processing unit of the common circuit segment is used to filter, amplify, and compare the amplitude of the neutron electrical signal to obtain the neutron pulse signal. The main processing unit of the common circuit segment is used to encode the density pulse signal from the density sensor assembly and the neutron pulse signal from the neutron signal processing unit and then transmit them to the ground host.

[0008] Specifically, the common circuit segment includes: a pressure-bearing housing, a control unit, a circuit frame, and a power supply assembly; The pressure-bearing outer shell is a cylindrical structure, with one end connected to an electric eccentric and the other end connected to a neutron source assembly. A pressure-bearing mounting cavity is formed between the pressure-bearing outer shell, the electric eccentric, and the neutron source assembly. The circuit skeleton is set in the pressure-bearing mounting cavity, and the neutron signal processing unit and the main processing unit are both set on the circuit skeleton. The control unit, mounted on the circuit frame, is signal-connected to the caliper assembly, the electric eccentric, and the pusher. The control unit is used to send a balancing command to the electric eccentric based on the wellbore diameter received from the caliper assembly, causing the electric eccentric to provide a balancing force to the neutron source assembly and the density sensor assembly; and to send a pushing command to the pusher based on the wellbore diameter, causing the pusher to drive the density sensor assembly to conform to the logging wellbore wall. It is also used to control the start and stop of the neutron source assembly and the density sensor assembly. The power supply assembly is mounted on the circuit frame and is used to supply power to the electric eccentric, common circuit section, neutron source assembly, pusher, wellbore assembly and density sensor assembly.

[0009] Specifically, the common circuit segment further includes: a communication board; The communication board is mechanically connected to the circuit skeleton and electrically connected to the ground host, the neutron signal processing unit and the main processing unit, and is used to send the encoded neutron pulse signal and density pulse signal to the ground host.

[0010] Specifically, the neutron source assembly further includes: a neutron source shell; The neutron source shell is a cylindrical structure, with one end connected to the pressure-bearing shell and the other end connected to the pusher. A mounting cavity is provided on the outer shell wall of the neutron source shell. The neutron emission source is located inside the cavity and is used to emit fast neutrons into the formation. The neutron receiving module is installed in the pressure-bearing mounting cavity of the common circuit section and is used to receive thermal neutrons and output corresponding neutron electrical signals.

[0011] Specifically, the neutron source component further includes: a first shielding block; The neutron receiving module includes: a long-pitch helium-3 tube and a short-pitch helium-3 tube; The long-pitch helium-3 tube, the first shielding block, and the short-pitch helium-3 tube are all installed in the pressure-bearing installation cavity. The first shielding block is installed between the long-pitch helium-3 tube and the short-pitch helium-3 tube to reduce mutual interference between them. The short-pitch helium-3 tube is installed on the side of the pressure-bearing installation cavity closer to the neutron source shell. Both the long-spacing helium-3 tube and the short-spacing helium-3 tube are used to detect thermal neutron signals in the strata, and output corresponding neutron electrical signals based on the detected thermal neutron signals.

[0012] Specifically, the density sensor assembly further includes: a density source housing and a first skeleton; The density source housing has a first and second independent mounting cavity, and one end of the density source housing is connected to the wellbore assembly. The density emission source is disposed in the first mounting cavity and is used to emit gamma rays into the formation; The first frame is disposed within the second mounting cavity to support the density receiving module; The digital processing module is connected to the main processing unit of the common circuit segment and is located in the second mounting cavity. It is used to amplify and digitally process the density electrical signal to obtain a density pulse signal and transmit the density pulse signal to the main processing unit.

[0013] Specifically, the density sensor assembly further includes: a second shielding block; The density receiving module includes: a long-source-pitch gamma detector and a short-source-pitch gamma detector; The long-pitch gamma detector, the short-pitch gamma detector, and the second shielding block are all located in the second mounting cavity and connected to the first frame. The second shielding block is located between the long-pitch gamma detector and the short-pitch gamma detector to reduce mutual interference between the long-pitch gamma detector and the short-pitch gamma detector. The short-pitch gamma detector is located in the second mounting cavity on the side close to the first mounting cavity. Both the long-spacing gamma detector and the short-spacing gamma detector are used to receive gamma rays after the Doppler effect occurs in the strata, convert the received gamma rays after the Doppler effect occurs into corresponding density electrical signals and transmit them to the digital processing module.

[0014] Specifically, the density sensor assembly further includes: a vibration damping pad and a vibration damping spring disposed within the second mounting cavity between the tail end of the first skeleton and the bottom of the second mounting cavity; The vibration damping pad is fitted to the tail end of the first frame, and the vibration damping spring is located between the vibration damping pad and the bottom of the second mounting cavity.

[0015] Another aspect of the present invention provides a well logging data acquisition method, which is performed using any of the above-mentioned integrated well logging instruments, the well logging data acquisition method comprising: The wellbore diameter detection component detects the wellbore diameter and sends it to the control unit of the common circuit section. The control unit of the common circuit section issues balancing and pushing commands based on the wellbore diameter. The electric eccentric device maintains the balance of the neutron source assembly and density sensor assembly when they are off-center from the logging center, based on balance commands. The pusher drives the density sensor assembly to fit against the wellbore wall based on the pusher command; Fast neutrons are emitted into the formation through the neutron emission source of the neutron source assembly. The neutron receiving module of the neutron source assembly receives the fast neutrons and they are decelerated into thermal neutrons after elastic scattering with the atomic nuclei of the formation medium. The corresponding neutron electrical signal is output based on the thermal neutrons. The density sensor assembly emits gamma rays into the formation through its density emission source, receives the gamma rays after they undergo the Doppler effect in the formation through its receiving module, and converts and processes the gamma rays after the Doppler effect to obtain a density pulse signal. The neutron signal processing unit of the common circuit segment processes the neutron electrical signal to obtain the neutron pulse signal. The main processing unit of the common circuit segment encodes the neutron pulse signal and the density pulse signal respectively and then transmits them to the ground host.

[0016] Specifically, the conversion and processing of the gamma rays after the Doppler effect to obtain the density pulse signal includes: The received gamma rays after the Doppler effect is converted into density electrical signals by long-pitch gamma detectors and short-pitch gamma detectors. The density electrical signal is amplified and digitized by a digital processing module to obtain a density pulse signal.

[0017] Specifically, the process of processing the neutron electrical signal to obtain the neutron pulse signal includes: The neutron signal is filtered, amplified, and amplitude compared by the neutron signal processing unit to obtain the neutron pulse signal.

[0018] The integrated logging tool provided by this invention comprises an electric eccentric, a common circuit section, a neutron source assembly, a pusher, a caliper assembly, and a density sensor assembly that are mechanically connected in sequence. Furthermore, the electric eccentric, neutron source, pusher, caliper, and density sensor assembly are electrically connected to the common circuit section. The neutron signal processing unit, neutron receiving module, and main processing unit are integrated into the common circuit section, optimizing the logging tool's circuit layout, shortening the length of the neutron source and density sensor assemblies, and improving their measurement accuracy. This solves the problems of excessive overall length and poor reliability in existing logging tools.

[0019] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the integrated logging tool provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the common circuit section and the electric eccentric device connected side in the integrated logging tool provided in this embodiment of the invention; Figure 3 This is a schematic diagram of the structure of the common circuit section and the neutron source component connected in the integrated logging tool provided in this embodiment of the invention; Figure 4 This is a schematic diagram of the neutron source component in the integrated logging tool provided in this embodiment of the invention; Figure 5 yes Figure 4 Sectional view along axis AA; Figure 6 This is a schematic diagram of the density sensor assembly in the integrated logging tool provided in this embodiment of the invention; Figure 7 This is a cross-sectional view of the density sensor assembly in the integrated logging tool provided in this embodiment of the invention; Figure 8 This is a circuit diagram of the integrated logging tool provided in an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached figures 1-Electric eccentric; 2-Common circuit section; 3-Neutron source assembly; 4-Pusher; 5-Wellbore assembly; 6-Density sensor assembly; 21-Pressure-bearing housing; 22-Circuit frame; 23-Pressure-bearing mounting cavity; 201-Upper connector; 207-Power conversion unit; 208-Communication board; 210-Power assembly; 212-Main processing unit; 213-Neutron signal processing unit; 214-Long-pitch helium triode; 215-First shielding block; 216-Short-pitch helium triode; 301-Neutron source housing; 302-Neutron emission source; 601-Connector; 602-Density source housing; 603-Beryllium window cover; 604-Sealing plug; 605-Density source assembly; 606-Hinge; 607-Pressure-bearing sealing connector; 608-Digital processing module; 610-First frame; 611-Beryllium hole; 612-Long-pitch gamma detector; 613-Second shielding block; 614-Short-pitch gamma detector; 616-Vibration damping pad; 617-Vibration damping spring; 618-Density emission source; 620-Connecting pin. Detailed Implementation The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0022] Figure 1 This is a schematic diagram of the structure of an integrated logging tool; Figure 2 This is a schematic diagram of the structure of the common circuit section and the electric eccentric device connected in the integrated logging tool. Figure 3 This is a schematic diagram of the structure of the common circuit section and the neutron source component in the integrated logging tool. Figure 4 This is a schematic diagram of the neutron source component in an integrated logging tool; Figure 5 yes Figure 4 Sectional view along axis AA; Figure 6 This is a schematic diagram of the density sensor assembly in an integrated logging tool. Figure 7 This is a cross-sectional view of the density sensor assembly in an integrated logging tool; Figure 8 This is the circuit diagram of an integrated logging tool.

[0023] like Figures 1-4As shown, the present invention provides an integrated logging tool, which includes: an electric eccentric 1, a common circuit section 2, a neutron source component 3, a pusher 4, a caliper component 5, and a density sensor component 6, which are mechanically connected in sequence. The neutron source component 3, the pusher 4, the caliper component 5, and the density sensor component 6 are also electrically connected to the common circuit section 2. The main processing unit 212, which consists of the neutron signal processing unit 213 of the neutron source component 3, the neutron receiving module of the neutron source component 3, and the encoding unit of the neutron source component 3 and the encoding unit of the density sensor component 6, is integrated in the common circuit section 2.

[0024] The integrated logging tool provided by this invention comprises an electric eccentric 1, a common circuit section 2, a neutron source assembly 3, a pusher 4, a caliper assembly 5, and a density sensor assembly 6, which are mechanically connected in sequence. The electric eccentric 1, neutron source assembly 3, pusher 4, caliper assembly 5, and density sensor assembly 6 are also electrically connected to the common circuit section 2. The neutron signal processing unit 213, the neutron receiving module, and the main processing unit 212 are all integrated into the common circuit section 2. The neutron receiving module is used to receive thermal neutrons and output corresponding neutron electrical signals. The neutron signal processing unit 213 is used to filter, amplify, and compare the amplitude of the neutron electrical signals from the central receiving module to obtain neutron pulse signals. The main processing unit 212 is used to encode the density pulse signals and neutron pulse signals respectively and then transmit them to the ground host. The integrated logging tool provided by this invention integrates the neutron signal processing unit 213, the neutron receiving module and the main processing unit 212 into a common circuit segment, which optimizes the circuit layout of the logging tool, shortens the length of the neutron source component 3 and the density sensor component 6, improves the measurement accuracy of the neutron source component 3 and the density sensor component 6, and solves the problems of excessive overall length and poor reliability of the logging tool in the prior art.

[0025] In one embodiment, such as Figure 1 As shown, the electric eccentric 1 is used to provide balancing force to the neutron source assembly 3 and the density sensor assembly 6; The pusher 4 is used to drive the density sensor assembly 6 to fit against the well wall of the logging operation; Wellbore component 5 is used to detect the wellbore diameter; The neutron source component 3 includes a neutron emission source 302 and a neutron receiving module. Fast neutrons emitted by the neutron emission source 302 are elastically scattered with the atomic nuclei of the formation medium and decelerated into thermal neutrons. The neutron receiving module receives the thermal neutrons and outputs the corresponding neutron electrical signals to the neutron signal processing unit 213 of the common circuit segment 2. The density sensor assembly 6 includes a density emission source 618, a density receiving module, and a digital processing module 608. The density emission source 618 emits gamma rays into the formation, the density receiving module receives the gamma rays that undergo the Doppler effect in the formation, and the digital processing module 608 converts and processes the gamma rays that undergo the Doppler effect to obtain a density pulse signal and outputs it to the main processing unit 212 of the common circuit segment 2. Common circuit segment 2 is electrically connected to the ground host; the neutron signal processing unit 213 of common circuit segment 2 filters, amplifies and compares the neutron electrical signal to obtain the neutron pulse signal; the main processing unit 212 of common circuit segment 2 encodes the density pulse signal from density sensor component 6 and the neutron pulse signal from neutron signal processing unit 213 and transmits them to the ground host.

[0026] The common circuit segment 2 includes: a pressure-bearing housing 21, a control unit, a circuit frame 22, and a power supply assembly 210; The pressure-bearing outer shell 21 is a cylindrical structure with one end connected to the electric eccentric 1 and the other end connected to the neutron source assembly 3. A pressure-bearing mounting cavity 23 is formed between the pressure-bearing outer shell 21, the electric eccentric 1 and the neutron source assembly 3. The circuit frame 22 is disposed in the pressure-bearing mounting cavity 23, and the neutron signal processing unit 213 and the main processing unit 212 are both disposed on the circuit frame 22. The control unit is mounted on the circuit frame 22 and is signal-connected to the caliper assembly 5, the electric eccentric device 1, and the pusher 4. The control unit is used to send a balancing command to the electric eccentric device 1 according to the wellbore diameter received from the caliper assembly 5 so that the electric eccentric device 1 provides a balancing force to the neutron source assembly 3 and the density sensor assembly 6, and to send a pushing command to the pusher 4 according to the wellbore diameter so that the pusher 4 drives the density sensor assembly 6 to fit against the logging well wall; it is also used to control the start and stop of the neutron source assembly 3 and the density sensor assembly 6. The power supply assembly 210 is mounted on the circuit frame 22 and is used to supply power to the electric eccentric 1, the common circuit section 2, the neutron source assembly 3, the pusher 4, the wellbore assembly 5, and the density sensor assembly 6.

[0027] The common circuit segment 2 also includes: a communication board 208; The communication board 208 is mechanically connected to the circuit frame 22, and electrically connected to the ground host, neutron signal processing unit 213 and main processing unit 212, for transmitting the encoded neutron pulse signal and density pulse signal to the ground host.

[0028] The caliper assembly 5 detects the wellbore diameter and sends it to the control unit of the common circuit section 2. The caliper assembly 5 is a caliper instrument with a pull rod potentiometer. The pull rod potentiometer determines the wellbore diameter. The control unit of the common circuit section 2 sends a balancing command to the electric eccentric unit 1 and a pushing command to the pusher 4 based on the wellbore diameter. The pusher 4 drives the density sensor assembly 6 to conform to the wellbore wall according to the pushing command. The density sensor assembly 6, neutron source assembly 3, caliper assembly 5, and common circuit section 2 are mechanically connected. Therefore, when the density sensor assembly 6 conforms to the wellbore wall, the integrated logging instrument as a whole... The integrated logging tool is positioned against the wellbore wall, at which point it is in an eccentric state, deviating from the logging center. To ensure accurate data acquisition by the density sensor assembly 6 and the neutron source assembly 3, the electric eccentric unit 1 provides a balancing force to the neutron source assembly 3 and the density sensor assembly 6 according to a balancing command, ensuring they are balanced even when deviating from the logging center. The neutron source assembly 3 starts according to the start / stop command sent by the control unit of the common circuit segment 2. After starting, the neutron source assembly 3 emits fast neutrons into the formation. These fast neutrons undergo elastic scattering with the atomic nuclei of the formation medium and decelerate into thermal neutrons. The neutron receiving module receives thermal neutrons from the formation and outputs the corresponding neutron electrical signal to the neutron signal processing unit 213 in the common circuit segment 2. The neutron signal processing unit 213 filters, amplifies, and compares the neutron electrical signal to obtain a neutron pulse signal, which is then sent to the main processing unit 212. After the density sensor assembly 6 starts according to the start / stop command, it emits gamma rays into the formation. The gamma rays undergo the Doppler effect in the formation. The density receiving module of the density sensor assembly 6 receives the gamma rays after the Doppler effect and converts and processes them through the digital processing module 6. The gamma rays are converted into density pulse signals and sent to the main processing unit 212 of the common circuit segment 2. The electromechanical interface connecting the common circuit segment 2 to the ground host is integrated on the common circuit segment 2. The communication interface of the communication board 208 integrated in the common circuit segment 2 is electrically connected to the main processing unit 212 and the electromechanical interface. The main processing unit 212 encodes the neutron pulse signal and the density pulse signal respectively and then transmits them to the ground host through the communication board 208, thereby completing data acquisition. Afterwards, the ground host obtains the porosity and density information of the formation based on the acquired data. The integrated logging tool provided by this invention integrates the processing circuits of the neutron source component 3 and the density sensor component 6 in the common circuit segment 2, optimizes the circuit layout of the logging tool, shortens the length of the neutron source component 3 and the density sensor component 6, and improves the measurement accuracy of the neutron source component and the density sensor component.

[0029] When collecting logging information, the electric eccentric 1 provides a balancing force to the neutron source assembly 3 and the density sensor assembly 6 according to the balancing command, so that the neutron source assembly 3 and the density sensor assembly 6 can maintain balance even when they are off the logging center. The pusher 4 drives the density sensor assembly 6 to fit against the logging well wall according to the pusher command, so that the neutron source assembly 3 can emit fast neutrons into the formation and the density sensor assembly 6 can emit gamma rays into the formation.

[0030] To connect the electric eccentric device 1, an upper connector 201 is provided at one end of the pressure-bearing housing 21. The pressure-bearing housing 21 is connected to the electric eccentric device 1 through the upper connector 201. The pressure-bearing housing 21 can withstand the external mud pressure, thereby protecting the instruments or circuits installed in the pressure-bearing mounting cavity 23. The circuit frame 22 is fixed in the pressure-bearing mounting cavity 23 of the pressure-bearing housing 21. The neutron signal processing unit 213, the main processing unit 212 and the power supply assembly 210 are all fixed on the circuit frame 22. The power supply assembly 210 supplies power to the electric eccentric device 1, the common circuit section 2, the neutron source assembly 3, the pusher 4, the wellbore assembly 5 and the density sensor assembly 6.The power supply assembly 210 includes a power conversion unit 207 and an internal power supply. The power conversion unit 207 is a power transformer. The power conversion unit 207 is connected to an external power supply through an electromechanical interface in the common circuit section 2. The electrical energy provided by the external power supply is converted by the power conversion unit and stored in the internal power supply. Then, the internal power supply supplies power to the electrical components of the integrated logging tool. Specifically, the internal power supply supplies power to the electric eccentric 1, common circuit section 2, neutron source assembly 3, pusher 4, caliper assembly 5, and density sensor assembly 6. The power conversion unit can also convert the external power supply into the electrical power required by the electrical components of the integrated logging tool. The system can directly supply power to the electrical components. The control unit is located on the circuit frame 22. The common circuit segment 2 receives the wellbore diameter detected by the caliper assembly 5 through the control unit and sends balance and push commands to the electric eccentric 1 and the pusher 4 according to the wellbore diameter. After receiving the balance command, the electric eccentric 1 can provide a balancing force to the neutron source assembly 3 and the density sensor assembly 6 to keep them balanced when they are off-center from the logging center. After receiving the push command, the pusher 4 can drive the density sensor assembly 6 to fit against the logging well wall. When the density sensor assembly 6 fits against the logging well wall, the integrated logging tool is in an off-center position. The integrated logging tool is kept in balance by an electric eccentric device 1 to maintain its position away from the logging center. When the neutron source assembly 3 and density sensor assembly 6 are started, the power supply assembly 210 supplies power to them. After being powered on, the neutron source assembly 3 emits fast neutrons into the formation. These fast neutrons undergo elastic scattering with the atomic nuclei of the formation medium and decelerate into thermal neutrons. The neutron source assembly 3 receives these thermal neutrons and outputs corresponding neutron electrical signals to the neutron signal processing unit 213. The neutron signal processing unit 213 filters, amplifies, and compares the amplitude of the neutron electrical signals to obtain the neutron source assembly 3's neutron electrical signal. The neutron pulse signal is sent to the main processing unit 212, and the density pulse signal is sent to the main processing unit 212. The main processing unit 212 encodes the neutron pulse signal and the density pulse signal. The encoded neutron pulse signal and the density pulse signal are then transmitted to the ground host via the communication board 208. Typically, before the density pulse signal is sent to the main processing unit 212, it is calibrated by the signal processing unit. Afterward, the calibrated density pulse signal is transmitted to the main processing unit 212 to ensure the accuracy and reliability of the density pulse signal received by the main processing unit 212.

[0031] like Figures 4-5 As shown, the neutron source component 3 includes: a neutron source housing 301; The neutron source housing 301 has a cylindrical structure, with one end connected to the pressure-bearing housing 21 and the other end connected to the pusher 4. A mounting cavity is provided on the outer shell wall of the neutron source housing 301. The neutron emission source 302 is disposed inside the cavity and is used to emit fast neutrons into the formation; The neutron receiving module is installed in the pressure-bearing mounting cavity 23 of the common circuit section 2, and is used to receive thermal neutrons and output corresponding neutron electrical signals; The neutron source component 3 further includes: a first shielding block 215; The neutron receiving module includes: a long-pitch helium tritube 214 and a short-pitch helium tritube 216; The long-pitch helium triode 214, the first shielding block 215, and the short-pitch helium triode 216 are all disposed in the pressure-bearing installation cavity 23. The first shielding block 215 is disposed between the long-pitch helium triode 214 and the short-pitch helium triode 216 to reduce mutual interference between the long-pitch helium triode 214 and the short-pitch helium triode 216. The short-pitch helium triode 216 is disposed in the pressure-bearing installation cavity on the side close to the neutron source shell 301. Both the long-spacing helium-3 tube 214 and the short-spacing helium-3 tube 216 are used to detect thermal neutron signals in the strata, and output corresponding neutron electrical signals to the neutron signal processing unit 213 based on the detected thermal neutron signals.

[0032] To obtain formation porosity, neutron source assembly 3 collects data corresponding to formation porosity. One end of the neutron source shell 301 of neutron source assembly 3 is connected to the pressure-bearing shell 21, and the other end is connected to the pusher 4. A mounting cavity is formed on the outer shell wall of the neutron source shell 301. The neutron emission source 302 is fixed in the mounting cavity by positioning pins, shaft pins, locking screws, etc. The neutron emission source 302 is used to emit block neutrons into the formation. Fast neutrons are decelerated into thermal neutrons after elastic scattering with the atomic nuclei of the formation medium in the formation. The long-spacing helium-3 tube 214 and the short-spacing helium-3 tube 216 set in the pressure-bearing mounting cavity 23 are used to detect thermal neutrons in the formation. The helium-3 tube 216 is installed inside the pressure-bearing installation cavity 23 and close to the neutron emission source 302. The long-pitch helium-3 tube 214 is installed outside the pressure-bearing installation cavity 23 and away from the neutron emission source 302. The first shielding block 215 installed between the long-pitch helium-3 tube 214 and the short-pitch helium-3 tube 216 can prevent interference between the long-pitch helium-3 tube 214 and the short-pitch helium-3 tube 216 when receiving thermal neutrons. The long-pitch helium-3 tube 214 and the short-pitch helium-3 tube 216 convert the detected thermal neutrons into corresponding neutron electrical signals and send them to the neutron signal processing unit 213. The neutron signal processing unit 213 filters, amplifies and compares the received neutron electrical signals to obtain neutron pulse signals.

[0033] In order to obtain the formation density, the density sensor assembly 6 collects the data corresponding to the formation density. The density sensor assembly 6 also includes: a density source housing 602 and a first skeleton 610. The density source housing 602 has a first mounting cavity and a second mounting cavity that are independent of each other, and one end of the density source housing 602 is connected to the wellbore assembly 5. The density emission source 618 is disposed in the first mounting cavity and is used to emit gamma rays into the formation. The first frame 610 is disposed in the second mounting cavity for supporting the density receiving module; The digital processing module 608 is signal-connected to the main processing unit 212 of the common circuit segment 2 and is located in the second mounting cavity. It is used to amplify and digitally process the density electrical signal to obtain a density pulse signal and transmit the density pulse signal to the main processing unit 212.

[0034] Specifically, the density sensor assembly 6 further includes: a second shielding block 613; The density receiving module includes: a long-pitch gamma detector 612 and a short-pitch gamma detector 614; The long-pitch gamma detector 612, the short-pitch gamma detector 614, and the second shielding block 613 are all located in the second mounting cavity and connected to the first frame 610. The second shielding block 613 is located between the long-pitch gamma detector 612 and the short-pitch gamma detector 614 to reduce mutual interference between the long-pitch gamma detector 612 and the short-pitch gamma detector 614. The short-pitch gamma detector 614 is located in the second mounting cavity on the side close to the first mounting cavity. Both the long-pitch gamma detector 612 and the short-pitch gamma detector 614 are used to receive gamma rays after the Doppler effect occurs in the strata, and convert the received gamma rays after the Doppler effect occurs into corresponding density electrical signals and transmit them to the digital processing module 608. The density sensor assembly 6 further includes: a vibration damping pad 616 and a vibration damping spring 617 disposed in the second mounting cavity between the tail end of the first frame 610 and the bottom of the second mounting cavity; The vibration damping pad 616 is fitted to the tail end of the first frame 610, and the vibration damping spring 617 is located between the vibration damping pad 616 and the bottom of the second mounting cavity.

[0035] like Figures 6-7As shown, a connector 601 is formed at one end of the density source housing 602 of the density sensor assembly 6, which is connected to the wellbore assembly 5 via the connector 601. The wellbore assembly 5 is a logging tool. A first mounting cavity and a second mounting cavity are provided on the density source housing 602. The first mounting cavity and the second mounting cavity are not connected. The density emission source 618 is set in the first mounting cavity. Gamma rays are emitted into the formation through the density emission source 618. The gamma rays undergo the Doppler effect in the formation. The Doppler effect is received by the long-spacing gamma detector 612 and the short-spacing gamma detector 614. The gamma ray detectors, long-pitch gamma detector 612 and short-pitch gamma detector 614, are both mounted on the first frame 610 within the second mounting cavity. An internal connector 609 is located at the front end of the first frame 610. A vibration damping pad 616 and a vibration damping spring 617 are positioned between the rear end of the first frame 610 and the bottom of the second mounting cavity. The bottom of the second mounting cavity is defined as the cavity wall on the side of the second mounting cavity closest to the first mounting cavity. The vibration damping pad 616 and the vibration damping spring 617 are used to dampen the vibration of the core components mounted on the first frame 610. A digital processing module 608 and... The long-pitch gamma detector 612 and the short-pitch gamma detector 614 are connected by an internal connector 609. A second shielding block 613 is placed between the long-pitch gamma detector 612 and the short-pitch gamma detector 614 to prevent mutual interference when they receive gamma rays after the Doppler effect. The short-pitch gamma detector 614 is located in the second mounting cavity and is closer to the density emission source 618 than the long-pitch gamma detector 612. 14 After receiving the gamma rays after the Doppler effect, the gamma rays after the Doppler effect are converted into corresponding density electrical signals. After receiving the density electrical signals, the digital processing module 608 amplifies and digitally processes the density electrical signals to obtain density pulse signals. Then, the density pulse signals are transmitted to the main processing unit 212. The main processing unit 212 encodes the density pulse signals and transmits them to the ground host via the communication board 208. After receiving the encoded pulse signals, the ground host processes them to obtain the density information of the strata.

[0036] For example, 6- Figure 7As shown, one end of connector 601 is connected to the wellbore assembly 5, and the other end is connected to one end of density source housing 602. A pressure-bearing sealing connector 607 is provided at the connection point between connector 601 and density source housing 602 within the second mounting cavity for electrical connection between density sensor assembly 6 and common circuit segment 2. Density source housing 602 provides protection for components installed in the second mounting cavity. Density source assembly 605 is located within the first mounting cavity and includes a density emission source 618. A beryllium hole 611 communicating with the second mounting cavity is formed on density source housing 602. The beryllium hole 611 is located near the long-pitch gamma detector 612 within density source housing 602. A beryllium window cover plate 603 is provided at the opening of the beryllium hole 611 to cover the opening of the beryllium hole. A blind hole is also provided on the density source housing 602. The blind hole is provided on the density source housing 602 near the short-pitch gamma detector 614. A sealing plug 604 is embedded in the blind hole. The beryllium window cover plate 603 and the sealing plug 604 reduce the shielding of the density source housing 602 on the long-pitch gamma detector 612 and the short-pitch gamma detector 614 in the second mounting cavity after receiving the gamma rays after the Doppler effect, thereby increasing the initial detection signal. A hinge 606 is provided at the tail end of the density source housing 602. The hinge 606 is connected to the density source housing 602 through a connecting pin 620.

[0037] Another aspect of the present invention provides a well logging data acquisition method, which is performed using any of the above-mentioned integrated well logging instruments, the well logging data acquisition method comprising: The wellbore diameter detection component detects the wellbore diameter and sends it to the control unit of the common circuit section. The control unit of the common circuit section issues balancing and pushing commands based on the wellbore diameter. The electric eccentric device maintains the balance of the neutron source assembly and density sensor assembly when they are off-center from the logging center, based on balance commands. The pusher drives the density sensor assembly to fit against the wellbore wall based on the pusher command; Fast neutrons are emitted into the formation through the neutron emission source of the neutron source assembly. The neutron receiving module of the neutron source assembly receives the fast neutrons and they are decelerated into thermal neutrons after elastic scattering with the atomic nuclei of the formation medium. The corresponding neutron electrical signal is output based on the thermal neutrons. The density sensor assembly emits gamma rays into the formation through its density emission source, receives the gamma rays after they undergo the Doppler effect in the formation through its receiving module, and converts and processes the gamma rays after the Doppler effect to obtain a density pulse signal. The neutron signal processing unit of the common circuit segment processes the neutron electrical signal to obtain the neutron pulse signal. The main processing unit of the common circuit segment encodes the neutron pulse signal and the density pulse signal respectively and then transmits them to the ground host.

[0038] The conversion and processing of gamma rays after the Doppler effect to obtain density pulse signals includes: The received gamma rays after the Doppler effect is converted into density electrical signals by long-pitch gamma detectors and short-pitch gamma detectors. The density electrical signal is amplified and digitized by a digital processing module to obtain a density pulse signal.

[0039] The process of processing neutron electrical signals to obtain neutron pulse signals includes: The neutron signal is filtered, amplified, and amplitude compared by the neutron signal processing unit to obtain the neutron pulse signal.

[0040] The integrated logging tool provided by this invention comprises an electric eccentric, a common circuit section, a neutron source assembly, a pusher, a caliper assembly, and a density sensor assembly that are mechanically connected in sequence. Furthermore, the electric eccentric, neutron source, pusher, caliper, and density sensor assembly are electrically connected to the common circuit section. The neutron signal processing unit, neutron receiving module, and main processing unit are integrated into the common circuit section, optimizing the logging tool's circuit layout, shortening the length of the neutron source and density sensor assemblies, and improving their measurement accuracy. This solves the problems of excessive overall length and poor reliability in existing logging tools.

[0041] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention.

[0042] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not describe the various possible combinations separately.

[0043] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. This program is stored in a storage medium and includes several instructions to cause a microcontroller, chip, or processor to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0044] Furthermore, various different implementations of the present invention can be combined arbitrarily, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed in the present invention.

Claims

1. An integrated logging tool, electrically connected to a surface host, characterized in that, The integrated logging tool includes: an electric eccentric (1), a common circuit section (2), a neutron source assembly (3), a pusher (4), a caliper assembly (5), and a density sensor assembly (6) connected in sequence by mechanical connection. The neutron source assembly (3), the pusher (4), the caliper assembly (5), and the density sensor assembly (6) are also electrically connected to the common circuit section (2). The neutron signal processing unit (213) of the neutron source assembly (3), the neutron receiving module of the neutron source assembly (3), and the main processing unit (212) composed of the encoding unit of the neutron source assembly (3) and the encoding unit of the density sensor assembly (6) are integrated in the common circuit section (2).

2. The integrated logging tool according to claim 1, characterized in that, The electric eccentric (1) is used to provide balancing forces to the neutron source assembly (3) and the density sensor assembly (6); The pusher (4) is used to drive the density sensor assembly (6) to fit against the well wall; The wellbore assembly (5) is used to detect the wellbore diameter; The neutron source component (3) includes a neutron emission source (302) and a neutron receiving module. Fast neutrons emitted by the neutron emission source are elastically scattered with the atomic nuclei of the formation medium and decelerated into thermal neutrons. The neutron receiving module receives and outputs the corresponding neutron electrical signal to the neutron signal processing unit (213) of the common circuit segment (2). The density sensor assembly (6) includes a density emission source (618), a density receiving module, and a digital processing module (608). The density emission source (618) emits gamma rays into the formation, the density receiving module receives the gamma rays that have a Doppler effect in the formation, and the digital processing module (608) converts and processes the gamma rays that have a Doppler effect to obtain a density pulse signal and outputs it to the main processing unit (212) of the common circuit segment (2). The common circuit segment (2) is electrically connected to the ground host. The neutron signal processing unit (213) of the common circuit segment (2) filters, amplifies and compares the neutron electrical signal to obtain the neutron pulse signal. The main processing unit (212) of the common circuit segment (2) encodes the density pulse signal from the density sensor assembly (6) and the neutron pulse signal from the neutron signal processing unit (213) and transmits them to the ground host.

3. The integrated logging tool according to claim 2, characterized in that, The common circuit segment (2) also includes: a pressure-bearing housing (21), a control unit, a circuit frame (22), and a power supply assembly (210). The pressure-bearing shell (21) is a cylindrical structure with one end connected to the electric eccentric (1) and the other end connected to the neutron source assembly (3). A pressure-bearing mounting cavity (23) is formed between the pressure-bearing shell (21), the electric eccentric (1) and the neutron source assembly (3). The circuit frame (22) is disposed in the pressure-bearing mounting cavity (23), and the neutron signal processing unit (213) and the main processing unit (212) are both disposed on the circuit frame (22); The control unit is mounted on the circuit frame (22) and is signal-connected to the caliper assembly (5), the electric eccentric (1), and the pusher (4). The control unit is used to send a balancing command to the electric eccentric (1) according to the wellbore diameter received from the caliper assembly (5) so that the electric eccentric (1) provides a balancing force to the neutron source assembly (3) and the density sensor assembly (6), and to send a pushing command to the pusher (4) according to the wellbore diameter so that the pusher (4) drives the density sensor assembly (6) to fit against the logging well wall. It is also used to control the start and stop of the neutron source assembly (3) and the density sensor assembly (6). The power supply assembly (210) is mounted on the circuit frame (22) and is used to supply power to the electric eccentric (1), the common circuit segment (2), the neutron source assembly (3), the pusher (4), the caliper assembly (5) and the density sensor assembly (6).

4. The integrated logging tool according to claim 3, characterized in that, The common circuit segment (2) also includes: a communication board (208); The communication board (208) is mechanically connected to the circuit frame (22) and electrically connected to the ground host, the neutron signal processing unit (213) and the main processing unit (212), and is used to send the encoded neutron pulse signal and density pulse signal to the ground host.

5. The integrated logging tool according to claim 4, characterized in that, The neutron source component (3) further includes: a neutron source shell (301); The neutron source shell (301) is a cylindrical structure, with one end connected to the pressure-bearing shell (21) and the other end connected to the pusher (4). A mounting cavity is provided on the outer shell wall of the neutron source shell (301). The neutron emission source (302) is installed inside the cavity and is used to emit fast neutrons into the formation; The neutron receiving module is installed in the pressure-bearing mounting cavity (23) of the common circuit section (2) and is used to receive thermal neutrons and output corresponding neutron electrical signals.

6. The integrated logging tool according to claim 5, characterized in that, The neutron source component (3) further includes: a first shielding block (215); The neutron receiving module includes: a long-pitch helium tritube (214) and a short-pitch helium tritube (216). The long-pitch helium triode (214), the first shielding block (215), and the short-pitch helium triode (216) are all located in the pressure-bearing installation cavity (23). The first shielding block (215) is located between the long-pitch helium triode (214) and the short-pitch helium triode (216) to reduce mutual interference between them. The short-pitch helium triode (216) is located in the pressure-bearing installation cavity (23) on the side close to the neutron source shell (301). Both the long-spacing helium tritube (214) and the short-spacing helium tritube (216) are used to detect thermal neutron signals in the strata, and output corresponding neutron electrical signals to the neutron signal processing unit (213) based on the detected thermal neutron signals.

7. The integrated logging tool according to claim 2, characterized in that, The density sensor assembly (6) further includes: a density source housing (602) and a first skeleton (610). The density source housing (602) has a first mounting cavity and a second mounting cavity that are independent of each other, and one end of the density source housing (602) is connected to the wellbore assembly (5); The density emission source (618) is disposed in the first mounting cavity and is used to emit gamma rays into the formation; The first frame (610) is disposed in the second mounting cavity for supporting the density receiving module; The digital processing module (608) is connected to the main processing unit (212) of the common circuit segment (2) and is located in the second mounting cavity. It is used to amplify and digitally process the density electrical signal to obtain a density pulse signal and transmit the density pulse signal to the main processing unit (212).

8. The integrated logging tool according to claim 7, characterized in that, The density sensor assembly (6) further includes: a second shielding block (613); The density receiving module includes: a long-pitch gamma detector (612) and a short-pitch gamma detector (614). The long-pitch gamma detector (612), the short-pitch gamma detector (614), and the second shielding block (613) are all located in the second mounting cavity and connected to the first frame (610). The second shielding block (613) is located between the long-pitch gamma detector (612) and the short-pitch gamma detector (614) to reduce mutual interference between the long-pitch gamma detector (612) and the short-pitch gamma detector (614). The short-pitch gamma detector (614) is located in the second mounting cavity on the side close to the first mounting cavity. Both the long-spacing gamma detector (612) and the short-spacing gamma detector (614) are used to receive gamma rays after the Doppler effect occurs in the strata, convert the received gamma rays after the Doppler effect occurs into corresponding density electrical signals and transmit them to the digital processing module (608).

9. The integrated logging tool according to claim 8, characterized in that, The density sensor assembly (6) further includes: a damping pad (616) and a damping spring (617) disposed in the second mounting cavity between the tail end of the first frame (610) and the bottom of the second mounting cavity. The damping pad (616) is fitted to the tail end of the first frame (610), and the damping spring (617) is located between the damping pad (616) and the bottom of the second mounting cavity.

10. A well logging data acquisition method, wherein the data acquisition method is performed using the integrated well logging instrument as described in any one of claims 1-9, characterized in that, include: The wellbore diameter detection component detects the wellbore diameter and sends it to the control unit of the common circuit section. The control unit of the common circuit section issues balancing and pushing commands based on the wellbore diameter. The electric eccentric device maintains the balance of the neutron source assembly and density sensor assembly when they are off-center from the logging center, based on balance commands. The pusher drives the density sensor assembly to fit against the wellbore wall based on the pusher command; Fast neutrons are emitted into the formation through the neutron emission source of the neutron source assembly. The neutron receiving module of the neutron source assembly receives the fast neutrons and they are decelerated into thermal neutrons after elastic scattering with the atomic nuclei of the formation medium. The corresponding neutron electrical signal is output based on the thermal neutrons. The density sensor assembly emits gamma rays into the formation through its density emission source, receives the gamma rays after they undergo the Doppler effect in the formation through its receiving module, and converts and processes the gamma rays after the Doppler effect to obtain a density pulse signal. The neutron signal processing unit of the common circuit segment processes the neutron electrical signal to obtain the neutron pulse signal. The main processing unit of the common circuit segment encodes the neutron pulse signal and the density pulse signal respectively and then transmits them to the ground host.

11. The well logging data acquisition method according to claim 10, characterized in that, The conversion and processing of gamma rays after the Doppler effect to obtain density pulse signals includes: The received gamma rays after the Doppler effect is converted into density electrical signals by long-pitch gamma detectors and short-pitch gamma detectors. The density electrical signal is amplified and digitized by a digital processing module to obtain a density pulse signal.

12. The well logging data acquisition method according to claim 10, characterized in that, The process of processing neutron electrical signals to obtain neutron pulse signals includes: The neutron signal is filtered, amplified, and amplitude compared by the neutron signal processing unit to obtain the neutron pulse signal.

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