Well logging system and method based on while-drilling azimuth gamma imaging

Abstract

The invention discloses a logging system and method based on while-drilling azimuth gamma imaging, and the system comprises a data collection device which is used for collecting the motion parameters of a gamma sensor in real time in the while-drilling measurement process, and the gamma information, collected by the gamma sensor, in a stratum; the sector configuration device is used for dividing the well circumference into a plurality of sectors according to preset azimuth intervals; the tool face measuring device is used for collecting magnetic tool face information in real time in the measurement while drilling process and combining the magnetic tool face information with the motion parameters to obtain a dynamic gravity tool face so as to determine the actual distribution condition of gamma information in each sector; and the imaging device is used for generating a dynamic while-drilling azimuth gamma image according to the actual distribution condition of the gamma information in each sector. According to the method, accurate while-drilling azimuth gamma imaging is obtained, and dynamic while-drilling azimuth gamma imaging can be generated for the whole while-drilling measurement process.

Description

Technical Field

[0001] The invention belongs to the field of oil and gas development engineering, and in particular relates to a logging system and method based on while-drilling azimuthal gamma imaging. Background Art

[0002] With the development of the oil industry, the number of large-scale integrated oil and gas fields has been decreasing, and the exploration and development of the oil industry has shifted to concealed oil and gas reservoirs and offshore oil and gas reservoirs with increasing exploration difficulty. For the development of the aforementioned oil and gas reservoirs with exploration difficulties, traditional vertical wells can no longer improve the recovery rate and increase production. At the same time, in the drilling of horizontal wells, traditional logging methods can no longer meet the development needs. In order to solve the above problems, directional well development methods came into being, and logging while drilling technology suitable for horizontal well drilling quickly developed.

[0003] In the process of logging while drilling, the measurement of natural radioactivity of the formation is one of the necessary items, and the real-time measurement of natural gamma radioactivity in different azimuths of the formation is of great significance. At present, the natural gamma logging instrument only uses a single detector to measure the total count of natural gamma in the formation or the natural gamma spectrum. Although the existing technology can determine whether the drill bit is drilling in the reservoir, it cannot guarantee that the drilling trajectory of the drill bit is in the reservoir, and it cannot obtain azimuthal gamma imaging of the formation. The azimuthal gamma measurement equipment while drilling is a typical formation evaluation equipment, which has been widely used in oil drilling development. The azimuthal gamma measurement equipment while drilling can identify the formation gamma value of a certain azimuth of the drilling instrument. By uploading the azimuthal gamma parameters to the ground in real time, it can quickly and accurately determine whether the drilling instrument is drilling the target layer. In addition, the azimuthal gamma measurement equipment while drilling is used to measure the background gamma radiation of the formation, evaluate the gamma radiation level of the formation, and distinguish between reservoirs and rock formations.

[0004] Nowadays, the mainstream downhole azimuth gamma measurement equipment is the drill collar type azimuth gamma measurement equipment. The drill collar type azimuth gamma measurement equipment adopts a Geiger Mueller tube sensor, and the connection method is a threaded buckle type and a male and female slip ring. On the one hand, when installing the Geiger Mueller tube sensor, it is also necessary to open an opening on the outer wall of the drill collar to fix the Geiger Mueller tube sensor, which increases the complexity of installation; on the other hand, the drill collar type gamma structure is relatively complex, the production cost is high, and the transportation is inconvenient. In addition, the connection method of the male and female slip rings of the Geiger Mueller tube sensor also has the problem of virtual connection downhole, which greatly affects the accuracy of the measurement data. In the process of realizing the present invention, the inventor found that a probe tube type azimuth gamma probe tube and measurement method for a downhole inclinometer in the prior art can measure the gamma value of the downhole inclinometer in any azimuth, judge the position of the downhole inclinometer in the upper and lower bottom boundaries, and ensure the drilling of the downhole inclinometer in the storage layer. However, the installation size of the probe tube azimuth gamma probe is limited by the size of the logging instrument, so the gamma crystal used is small in size. At the same time, the probe tube is far away from the well wall, resulting in a low counting rate, which leads to poor azimuth characteristics of the final measurement data, and even the inability to image. In addition, the temperature index of conventional logging instruments can only reach 150℃. With the increase in existing high-temperature wells, the temperature resistance of 150℃ can no longer meet market demand. Summary of the invention

[0005] In order to solve the above problems, an embodiment of the present invention provides a logging system based on azimuthal gamma imaging while drilling, comprising: a data acquisition device, which is used to collect the motion parameters of the gamma sensor and the gamma information in the formation collected by the gamma sensor in real time during the measurement while drilling; a sector configuration device, which is used to divide the well circumference into multiple sectors according to preset azimuthal intervals; a tool face measurement device, which is used to collect magnetic tool face information in real time during the measurement while drilling, and combine the magnetic tool face information with the motion parameters to obtain a dynamic gravity tool face to determine the actual distribution of the gamma information in each sector; an imaging device, which is used to generate dynamic azimuthal gamma imaging while drilling according to the actual distribution of the gamma information in each sector.

[0006] Preferably, the gamma sensor is fixed in a pressure-resistant cylinder of the well logging system.

[0007] Preferably, the tool face measuring device is further used to obtain the azimuth change information of the dynamic gravity tool face, and divide the gamma information into corresponding sectors according to the azimuth change information.

[0008] Preferably, the gamma sensor has a shielding layer with a specific shielding angle, and the shielding layer is used to enhance the azimuthal characteristic of the gamma information.

[0009] Preferably, the imaging device is further used for decoupling and storing the gamma values ​​before counting the gamma values ​​belonging to different sectors in the gamma information, and transmitting the finally stored gamma values ​​to the corresponding receiving device in real time.

[0010] Preferably, the logging system comprises a plurality of connectors for connecting different components in various devices in the logging system, and the connectors adopt mechanically fastened pin heads, wherein the connectors adopt ITT high temperature connectors.

[0011] Preferably, the logging system further comprises: a circuit failure detection device, which is used to perform failure detection on solder joints and circuit boards in various devices constituting the logging system to evaluate the quality of the solder joints and circuit boards, wherein solder joint detection includes but is not limited to appearance detection, X-ray detection and metallographic analysis, and circuit board detection includes but is not limited to appearance detection, dielectric withstand voltage detection, moisture resistance and insulation resistance detection and metallographic analysis.

[0012] Preferably, the data acquisition device is further used to analyze gamma information from different strata and convert the gamma information into corresponding API data to obtain the first mud content of the corresponding strata.

[0013] Preferably, the imaging device is also used to count the gamma values ​​belonging to different sectors in the gamma information in real time, and distribute the count values ​​to the corresponding sectors in real time to obtain a second mud content of the corresponding formation, and then use the second mud content to correct the first mud content to obtain the actual mud content of the corresponding formation.

[0014] In addition, the present invention also proposes a logging method based on azimuthal gamma imaging while drilling, the logging method comprising: a sector configuration device divides the well circumference into multiple sectors according to preset azimuthal intervals; during the measurement while drilling, a data acquisition device collects in real time the motion parameters of the gamma sensor and the gamma information in the formation collected by the gamma sensor, and a tool face measurement device collects in real time the magnetic tool face information; the tool face measurement device combines the magnetic tool face information with the motion parameters to obtain a dynamic gravity tool face to determine the actual distribution of the gamma information in each sector; an imaging device generates dynamic azimuthal gamma imaging while drilling according to the actual distribution of the gamma information in each sector.

[0015] Compared with the prior art, one or more embodiments of the above scheme may have the following advantages or beneficial effects:

[0016] The present invention proposes a logging system and method based on azimuthal gamma imaging while drilling, which counts the gamma values ​​of different sectors and distributes the counts to the sectors corresponding to the measured formations in real time to obtain the actual distribution of gamma information in each sector, thereby generating dynamic azimuthal gamma imaging while drilling for the entire measurement while drilling process according to the actual distribution of gamma information in each sector. The present invention obtains accurate azimuthal gamma imaging while drilling and can generate dynamic azimuthal gamma imaging while drilling for the entire measurement while drilling process.

[0017] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 Schematic diagram of the overall structure of a logging system based on azimuthal gamma imaging while drilling according to an embodiment of the present application.

[0020] Figure 2 A schematic diagram of the specific structure of a logging system based on azimuthal gamma imaging while drilling according to an embodiment of the present application.

[0021] Figure 3 Schematic diagram of sector distribution of a logging system based on azimuthal gamma imaging while drilling according to an embodiment of the present application.

[0022] Figure 4 A schematic diagram of a shielding layer of a logging system based on azimuthal gamma imaging while drilling according to an embodiment of the present application.

[0023] Figure 5 Schematic diagram of the circuit structure of a logging system based on azimuthal gamma imaging while drilling according to an embodiment of the present application.

[0024] Figure 6 This is a step diagram of a well logging method based on azimuthal gamma imaging while drilling according to an embodiment of the present application. DETAILED DESCRIPTION

[0025] The following will describe the implementation methods of the present invention in detail with reference to the accompanying drawings and embodiments, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly. It should be noted that as long as there is no conflict, the various embodiments of the present invention and the various features in the embodiments can be combined with each other, and the technical solutions formed are all within the protection scope of the present invention.

[0026] In addition, the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be performed in an order different from that shown here.

[0027] With the development of the oil industry, the number of large-scale integrated oil and gas fields has been decreasing, and the exploration and development of the oil industry has shifted to concealed oil and gas reservoirs and offshore oil and gas reservoirs with increasing exploration difficulty. For the development of the aforementioned oil and gas reservoirs with exploration difficulties, traditional vertical wells can no longer improve the recovery rate and increase production. At the same time, in the drilling of horizontal wells, traditional logging methods can no longer meet the development needs. In order to solve the above problems, directional well development methods came into being, and logging while drilling technology suitable for horizontal well drilling quickly developed.

[0028] In the process of logging while drilling, the measurement of natural radioactivity of the formation is one of the necessary items, and the real-time measurement of natural gamma radioactivity in different azimuths of the formation is of great significance. At present, the natural gamma logging instrument only uses a single detector to measure the total count of natural gamma in the formation or the natural gamma spectrum. Although the existing technology can determine whether the drill bit is drilling in the reservoir, it cannot guarantee that the drilling trajectory of the drill bit is in the reservoir, and it cannot obtain azimuthal gamma imaging of the formation. The azimuthal gamma measurement equipment while drilling is a typical formation evaluation equipment, which has been widely used in oil drilling development. The azimuthal gamma measurement equipment while drilling can identify the formation gamma value of a certain azimuth of the drilling instrument. By uploading the azimuthal gamma parameters to the ground in real time, it can quickly and accurately determine whether the drilling instrument is drilling the target layer. In addition, the azimuthal gamma measurement equipment while drilling is used to measure the background gamma radiation of the formation, evaluate the gamma radiation level of the formation, and distinguish between reservoirs and rock formations.

[0029] Nowadays, the mainstream downhole azimuth gamma measurement equipment is the drill collar type azimuth gamma measurement equipment. The drill collar type azimuth gamma measurement equipment adopts a Geiger Mueller tube sensor, and the connection method is a threaded buckle type and a male and female slip ring. On the one hand, when installing the Geiger Mueller tube sensor, it is also necessary to open an opening on the outer wall of the drill collar to fix the Geiger Mueller tube sensor, which increases the complexity of installation; on the other hand, the drill collar type gamma structure is relatively complex, the production cost is high, and the transportation is inconvenient. In addition, the connection method of the male and female slip rings of the Geiger Mueller tube sensor also has the problem of virtual connection downhole, which greatly affects the accuracy of the measurement data. In the process of realizing the present invention, the inventor found that a probe tube type azimuth gamma probe tube and measurement method for a downhole inclinometer in the prior art can measure the gamma value of the downhole inclinometer in any azimuth, judge the position of the downhole inclinometer in the upper and lower bottom boundaries, and ensure the drilling of the downhole inclinometer in the storage layer. However, the installation size of the probe tube azimuth gamma probe is limited by the size of the logging instrument, so the gamma crystal used is small in size. At the same time, the probe tube is far away from the well wall, resulting in a low counting rate, which leads to poor azimuth characteristics of the final measurement data, and even the inability to image. In addition, the temperature index of conventional logging instruments can only reach 150℃. With the increase in existing high-temperature wells, the temperature resistance of 150℃ can no longer meet market demand.

[0030] In order to solve the above problems, the present invention proposes a logging system and method based on azimuthal gamma imaging while drilling, which counts the gamma values ​​of different sectors and distributes these counts to the sectors corresponding to the measured formations in real time to obtain the actual distribution of gamma information in each sector, thereby generating dynamic azimuthal gamma imaging while drilling for the entire measurement while drilling process according to the actual distribution of gamma information in each sector. The present invention obtains accurate azimuthal gamma imaging while drilling and can generate dynamic azimuthal gamma imaging while drilling for the entire measurement while drilling process.

[0031] Embodiment 1

[0032] Figure 1 Schematic diagram of the overall structure of a logging system based on azimuthal gamma imaging while drilling according to an embodiment of the present application. Figure 2 The following is a schematic diagram of the specific structure of the logging system based on azimuthal gamma imaging while drilling according to the embodiment of the present application. Figure 1 and Figure 2 , the logging system based on azimuthal gamma imaging while drilling described in the present invention is described in detail.

[0033] like Figure 1The logging system based on azimuthal gamma imaging while drilling at least includes: a data acquisition device 11, a sector configuration device 12, a tool face measurement device 13 and an imaging device 14. Specifically, the data acquisition device 11 is used to collect the motion parameters of the gamma sensor and the gamma information in the formation collected by the gamma sensor in real time during the measurement while drilling; the sector configuration device 12 is used to divide the well circumference into a plurality of sectors according to a preset azimuthal interval; the tool face measurement device 13 is used to collect the magnetic tool face information in real time during the measurement while drilling, and combine the magnetic tool face information with the motion parameters collected by the data acquisition device 11 to obtain a dynamic gravity tool face to determine the actual distribution of the gamma information in each sector; the imaging device 14 is used to generate dynamic azimuthal gamma imaging while drilling according to the actual distribution of the gamma information obtained by the tool face measurement device 13 in each sector.

[0034] The data acquisition device 11 collects the motion parameters of the gamma sensor and the gamma information in the formation collected by the gamma sensor in real time during the measurement while drilling process. Specifically, the gamma sensor is arranged on the downhole measurement drill and moves with the rotation of the drill during the measurement while drilling process. The data acquisition device 11 collects the motion parameters of the gamma sensor in real time to obtain the motion state of the gamma sensor. In the embodiment of the present application, the motion state of the gamma sensor is used to reflect the motion of the downhole measurement drill. In addition, during the measurement while drilling process, the data acquisition device 11 also collects the natural gamma information (gamma rays) from the corresponding formation collected by the gamma sensor in real time, so as to obtain the corresponding formation characteristics according to the gamma information. In the embodiment of the present application, the gamma sensor is a high-precision gamma sensor.

[0035] The logging system described in this embodiment is a measurement node located on a downhole measurement drill tool. Figure 2 Schematic diagram of the specific structure of the logging system based on azimuthal gamma imaging while drilling according to the embodiment of the present application. Figure 2 The logging system mainly includes a measuring circuit short section 1, a gamma sensor 2, a braided wire 3, a connector 4 and a centralizer 5. Specifically, the measuring circuit short section 1 is connected to an external power supply according to actual needs to power the electrical equipment related to collecting motion parameters and gamma information during the entire measurement while drilling process. The measuring circuit short section 1 is an integrated circuit, which is installed on a circuit skeleton matching the logging system and is sealed as a whole after installation. After that, the measuring circuit short section 1, which has been sealed as a whole, is installed together with the gamma sensor 2 in the pressure-resistant tube in the logging system.

[0036] In the embodiment of the present application, the gamma sensor is fixed in the pressure-resistant tube of the well logging system, wherein the pressure-resistant tube in the well logging system is a miniaturized, thick-walled beryllium copper pressure-resistant tube.

[0037] The gamma sensor of this embodiment is compact, durable and suitable for mud drilling fluid, underbalanced and air drilling environments. At the same time, the gamma sensor is not affected by pulse electrical noise, and the design of the sensor minimizes the vibration induced noise of the gamma sensor and maximizes the battery life. The gamma sensor is connected to the corresponding position using a standard connector, so that the gamma sensor can be easily replaced.

[0038] The logging system includes a plurality of connectors 4 for connecting different components in each device in the logging system, and the connector 4 adopts a mechanically fastened pin head. In an embodiment of the present application, the interface of each device in the logging system is hung to the corresponding position by combining a pigtail line 3 and a connector 4. Among them, the connector 4 adopts an ITT high-temperature connector. The present invention changes the original connection method of combining software and hardware, ensures the stability of the pin connection in a high-temperature environment, and improves the reliability and temperature resistance of each device. In a specific embodiment of the present application, the overall temperature resistance of each device in the logging system is 175°C, which meets the use requirements of high-temperature wells.

[0039] Furthermore, the logging system of the present invention is also equipped with a high-temperature measurement and control circuit, which controls the measurement circuit sub 1 to ensure that the power consumption and energy consumption of the electrical equipment related to the collection of motion parameters and gamma information during the entire measurement while drilling process remain in the best state. In addition, by setting a working status monitoring and operation data storage unit for each device in the logging system, the corresponding monitoring information is obtained, and then the dynamic performance of the corresponding downhole instrument in the logging system is obtained by real-time analysis.

[0040] Figure 3 Schematic diagram of sector distribution of a logging system based on azimuth gamma imaging while drilling in an embodiment of the present application. The sector configuration device 12 divides the well circumference into a plurality of sectors according to a preset azimuth interval. In the embodiment of the present application, the well circumference is divided according to the same azimuth interval, wherein the number of sectors is generally configured as 2 sectors, 4 sectors, 8 sectors (refer to Figure 3 ) or 16 sectors.

[0041] Normally, in the process of drilling directional wells and horizontal wells, it is necessary to obtain the relative position of the downhole drill tool relative to a certain reference point in real time, that is, to measure a certain deviation angle of the drill tool, which is called the tool face or tool face angle in engineering. The tool face angle in a vertical well usually uses magnetic north as the reference point. In engineering, this tool face with magnetic north as the reference point is called the magnetic tool face MTF (Magnetic Tool Face). When the well inclination of a directional well or horizontal well is greater than a certain angle, the tool face usually uses the gravity direction as the reference point. In engineering, this tool face with the gravity direction as the reference point is called the gravity tool face GTF (Gravity Tool Face).

[0042] The gravity tool face is based on the local gravity field of the measured object. For example, the gravity field can be perpendicular to the axis of the drill bit. In practical applications, gravity accelerometers are usually used to measure the gravity field. As the LWD process progresses, the rotation of the drill bit downhole will cause stick-slip, centrifugal acceleration and downhole vibration of the drill bit, and the measurement results of the gravity accelerometer installed inside the drill bit will no longer be accurate. Since the strong vibration of the drill bit downhole during continuous rotary drilling is usually much greater than 1G, it is almost impossible to collect and calculate the gravity tool face instantaneously. In other words, the traditional real-time gravity tool face measured by gravity accelerometer based on the movement of the drill bit is no longer applicable.

[0043] Based on the above analysis, it can be seen that the vibration and rotation of the drill tool seriously affect the acquisition of the gravity tool face based on the gravity field. However, the vibration and rotation of the drill tool have almost no effect on the measurement results of the magnetometer. Therefore, by calculating the magnetic tool face downhole and using the magnetic tool face to correct the original gravity tool face affected by the vibration and rotation of the drill tool, the dynamic gravity tool face at any time required by the current project can be obtained.

[0044] Furthermore, the tool face measurement device 13 collects magnetic tool face information in real time during the measurement while drilling process, and combines the magnetic tool face information with the motion parameters to obtain a dynamic gravity tool face to determine the actual distribution of the gamma information in each sector. Figure 5 Schematic diagram of the circuit structure of the logging system based on azimuthal gamma imaging while drilling according to the embodiment of the present application. Figure 5 , the tool face measurement device 13 uses an azimuth module to realize its corresponding functions. Specifically, the tool face measurement device 13 receives the motion parameters and gamma information collected by the data acquisition device 11, and analyzes and performs data fusion processing on the motion parameters to obtain information such as the inclination angle, dynamic well deviation, and total weight of the drill tool of the gamma sensor, and converts the gamma information into corresponding digital quantities for further analysis. The tool face measurement device 13 collects magnetic tool face information in real time during the measurement while drilling process, and obtains the original gravity tool face through information such as dynamic well deviation and total weight of the drill tool, so as to use the magnetic tool face information to correct the original gravity tool face to realize accurate measurement of the dynamic gravity tool face, so as to determine the actual distribution of the gamma information in each sector. Finally, the tool face measurement device 13 also outputs the processed dynamic well deviation, drill tool rotation, azimuth gamma information during orientation, and total weight of the drill tool to the corresponding receiving device through the 485 interface.

[0045] Furthermore, the tool face measurement device 13 also obtains the azimuth change information of the dynamic gravity tool face, and divides the gamma information into corresponding sectors according to the azimuth change information. After obtaining the dynamic gravity tool face, the tool face measurement device 13 determines the azimuth change information of the dynamic gravity tool face, and then generates a position feedback signal for indicating the azimuth change information of the dynamic gravity tool face in real time according to the change of the dynamic gravity tool face. Then, a sector timing control signal is generated according to the position feedback signal to distribute the gamma information measured by the gamma sensor to the corresponding sectors that have been divided, thereby determining the actual distribution of the gamma information in each sector.

[0046] The gamma sensor has a shielding layer with a specific shielding angle, which is used to enhance the azimuthal characteristics of the gamma information. Figure 4 This is a schematic diagram of the shielding layer of the logging system based on azimuthal gamma imaging while drilling according to an embodiment of the present application. Figure 4 In order to ensure that the gamma sensor has high sensitivity and can overcome the harsh working environment of high temperature, high pressure, high impact and vibration underground, this embodiment adds a shielding layer with a specific angle around the gamma sensor. The existence of the shielding layer makes the gamma information in each sector obtained at a certain measurement time have azimuthal characteristics. If the gravity tool face does not rotate, it is easy to obtain the corresponding relationship between the gamma information measurement result and the average gamma value of each sector; if the gravity tool face rotates, the gamma values ​​belonging to different sectors change with the change of formation type, and it is necessary to obtain the average gamma value of each sector based on the corresponding relationship between the real-time gamma value and the sector.

[0047] Specifically, the measurement areas (sectors) around the gamma sensor are defined as I, II, III, and IV, and the measurement values ​​generated by the gravity tool face in each measurement area are defined as MI, MII, MIII, and MIV, respectively, and the measurement values ​​generated by the gravity tool face in all measurement areas around the gamma sensor are recorded as vector M. In a specific embodiment of the present application, the measurement areas around the gamma sensor are recorded as i, ii, iii, and iv. During the measurement process, affected by factors such as the shielding layer, the contribution of the corresponding types of stratum partitions of the gravity tool face in areas i, ii, iii, and iv to the measurement results is Bi, Bii, Biii, and Biv, and the total contribution of the stratum partitions corresponding to the gravity tool face in areas i, ii, iii, and iv to the measurement results is recorded as contribution vector B.

[0048] Next, in a specific embodiment of the present application, the peripheral measurement area of ​​the gamma sensor is sectors A, B, C, and D.

[0049] When the gravity tool face does not rotate, it is easy to obtain the corresponding relationship between the gamma information measurement results and the average gamma value of each sector. For example: the gravity tool face is facing the center line of sector A. As long as the measurement time is long enough, the measurement result can be obtained as the average gamma vector G multiplied by B of sectors A, B, C, and D, that is:

[0050] M=B*G (1)

[0051] Among them, G represents the average gamma vector of each sector, B represents the contribution vector, and M represents the real-time gamma value of each sector.

[0052] When the gravity tool face rotates, first, the dynamic change relationship between the measurement area (sector) around the gamma sensor and the corresponding type of stratigraphic division is obtained, and then the average gamma value of each sector is obtained by using the gamma information measurement results and combining the aforementioned dynamic change relationship, so as to calculate the corresponding real-time gamma information measurement results using the current average gamma value of each sector.

[0053] Further, the imaging device 14 generates dynamic while-drilling azimuthal gamma imaging according to the actual distribution of the gamma information in each sector. After the tool face measurement device 13 distributes the gamma information measured by the gamma sensor to the corresponding sectors, the imaging device 14 generates dynamic while-drilling azimuthal gamma imaging according to the gamma information belonging to each sector during the while-drilling measurement process.

[0054] The imaging device 14 also decouples and stores the gamma values ​​before counting the gamma values ​​belonging to different sectors in the gamma information, and transmits the finally stored gamma values ​​to the corresponding receiving device in real time. In the embodiment of the present application, the imaging device 14 needs to count the gamma values ​​from different sectors in real time, and decouple the gamma values ​​of each sector in the processing circuit. Then, the decoupled data is transmitted to the processor, and the processor sends the decoupled data to the storage module for storage, and based on the real-time communication function of the processor itself, the finally stored gamma value is transmitted to the corresponding receiving device in real time through the bus module.

[0055] Continue to refer to Figure 5 The power module is used to supply power to all electrical equipment in the logging system, and the temperature measurement module is used to measure the downhole temperature in real time (i.e., the temperature of the working environment of the logging system).

[0056] The data acquisition device 11 is also used to analyze the gamma information from different strata and convert the gamma information into corresponding API data to obtain the first mud content of the corresponding strata. Specifically, the data acquisition device 11 uses physical scale and correction technology to convert the gamma information from different strata into internationally accepted API data to obtain the first mud content that characterizes the mud content of the corresponding strata.

[0057] Furthermore, the imaging device 14 also counts the gamma values ​​belonging to different sectors in the gamma information in real time, and distributes the count values ​​to the corresponding sectors in real time to obtain the second mud content of the corresponding formation, and then uses the second mud content to correct the first mud content to obtain the actual mud content of the corresponding formation. Specifically, the imaging device 14 counts the gamma values ​​belonging to different sectors in the gamma information, and distributes these counts to the corresponding sectors in real time to achieve gamma imaging, and obtain the second mud content of the corresponding formation, and then corrects the first mud content by comparing and analyzing the first mud content and the second mud content, so as to obtain the actual mud content of the corresponding formation.

[0058] Next, the logging system also includes a circuit failure detection device, which is used to perform failure detection on the solder joints and circuit boards in the various devices that constitute the logging system to evaluate the quality of the solder joints and circuit boards. Specifically, the circuit failure detection device mainly analyzes circuit failures caused by high temperature environments. From the perspective of specific failure analysis objects, the circuit failure detection device mainly analyzes the failure states of solder joints and circuit boards to perform failure detection on the solder joints and circuit boards in the various devices that constitute the logging system, thereby evaluating the quality of the solder joints and circuit boards. Among them, solder joint detection includes but is not limited to appearance detection, X-ray detection and metallographic analysis, and circuit board detection includes but is not limited to appearance detection, dielectric withstand voltage detection, moisture resistance and insulation resistance detection and metallographic analysis.

[0059] In an embodiment of the present application, the logging system will also periodically upload the remaining power of the batteries of the electrical equipment related to the collection of motion parameters and gamma information, so that the remaining power information can be monitored intuitively.

[0060] In practical applications, reducing the power supply voltage of the integrated circuit is the most direct and effective way to reduce the power consumption of the logging system, but the voltage reduction will increase the output delay of the gate circuit. Reducing the power consumption of the logging system can also be achieved by selectively implementing frequency reduction measures or reducing the load capacitance. Therefore, in the selection of components for hardware design, this embodiment selects integrated chips with high-temperature energy-saving functions to ensure high-temperature operation and reduce power consumption; on the premise of ensuring circuit performance, measures are taken to reduce the working voltage of the power supply to improve the conversion efficiency of the power supply; the circuit is simplified by reducing the number of components; for intelligent components, the CPU is used to realize the calculation and processing functions, making the hardware software. In software design, software is used to replace hardware to achieve the purpose of reducing power consumption and reducing costs, improve the reliability of work, and facilitate maintenance and upgrading; the power management function of the microprocessor itself is used to reduce the power consumption of the logging system; interrupt control and other operations are used to reduce power consumption; software means are used to adjust the corresponding instrument operating parameters to reduce energy consumption.

[0061] Embodiment 2

[0062] On the other hand, based on the above-mentioned logging system based on azimuthal gamma imaging while drilling, an embodiment of the present invention also proposes a logging method based on azimuthal gamma imaging while drilling. The method utilizes the above-mentioned logging system based on azimuthal gamma imaging while drilling to effectively realize the generation of dynamic azimuthal gamma imaging while drilling. Figure 6 FIG. 1 is a step diagram of a logging method based on azimuthal gamma imaging while drilling according to an embodiment of the present application. Figure 6 As shown, the logging method based on azimuthal gamma imaging while drilling described in the present invention includes the following steps: step S610, the sector configuration device divides the well circumference into multiple sectors according to preset azimuthal intervals; step S620, during the measurement while drilling, the motion parameters of the gamma sensor and the gamma information in the formation collected by the gamma sensor are collected in real time by the data acquisition device, and the magnetic tool face information is collected in real time by the tool face measurement device; step S630, the tool face measurement device combines the magnetic tool face information with the motion parameters to obtain a dynamic gravity tool face to determine the actual distribution of the gamma information in each sector; step S640, the imaging device generates dynamic azimuthal gamma imaging while drilling according to the actual distribution of the gamma information in each sector.

[0063] The present invention proposes a logging system and method based on azimuthal gamma imaging while drilling. The system counts the gamma values ​​of different sectors and distributes these counts to the sectors corresponding to the measured formations in real time to obtain the actual distribution of gamma information in each sector, thereby generating dynamic azimuthal gamma imaging while drilling for the entire measurement while drilling process based on the actual distribution of gamma information in each sector. The present invention generates a dynamic magnetic tool face based on magnetic measurement during the measurement while drilling process to obtain an accurate dynamic gravity tool face, obtains accurate azimuthal gamma imaging while drilling, and can generate dynamic azimuthal gamma imaging while drilling for the entire measurement while drilling process. At the same time, the present invention has a shorter length, higher connection tightness, can better adapt to the harsh working environment of high temperature and high pressure, and greatly improves the comprehensive performance of the logging system.

[0064] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any person familiar with the technology within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

[0065] It should be understood that the embodiments disclosed in the present invention are not limited to the specific structures, processing steps or materials disclosed herein, but should be extended to equivalent substitutions of these features understood by ordinary technicians in the relevant field. It should also be understood that the terms used herein are only used for the purpose of describing specific embodiments and are not meant to be limiting.

[0066] The "one embodiment" or "embodiment" mentioned in the specification means that the specific features, structures or characteristics described in conjunction with the embodiment are included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment" or "embodiment" appearing in various places throughout the specification do not necessarily refer to the same embodiment.

[0067] Although the embodiments disclosed in the present invention are as above, the contents described are only embodiments adopted for facilitating the understanding of the present invention and are not intended to limit the present invention. Any technician in the technical field to which the present invention belongs can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in the present invention, but the patent protection scope of the present invention shall still be subject to the scope defined in the attached claims.

Claims

1. A logging system based on azimuthal gamma imaging while drilling, characterized in that: include: A data acquisition device, which is used to collect the motion parameters of the gamma sensor and the gamma information in the formation collected by the gamma sensor in real time during the measurement while drilling process; A sector configuration device, which is used to divide the well circumference into a plurality of sectors according to preset azimuth intervals; A tool face measurement device, which is used to collect magnetic tool face information in real time during the measurement while drilling process, and combine the magnetic tool face information with the motion parameters to obtain a dynamic gravity tool face to determine the actual distribution of the gamma information in each sector; An imaging device is used to generate dynamic while-drilling azimuthal gamma imaging according to the actual distribution of the gamma information in each sector.

2. The logging system according to claim 1, characterized in that: The gamma sensor is fixed in the pressure-resistant cylinder of the well logging system.

3. The logging system according to claim 1 or 2, characterized in that: The tool face measuring device is further used to obtain the azimuth change information of the dynamic gravity tool face, and divide the gamma information into corresponding sectors according to the azimuth change information.

4. The logging system according to any one of claims 1 to 3, characterized in that: The gamma sensor has a shielding layer with a specific shielding angle, and the shielding layer is used to enhance the azimuth characteristic of the gamma information.

5. The logging system according to claim 4, characterized in that: The imaging device is further used for decoupling and storing the gamma values ​​before counting the gamma values ​​belonging to different sectors in the gamma information, and transmitting the finally stored gamma values ​​to the corresponding receiving device in real time.

6. The well logging system according to any one of claims 1 to 5, characterized in that: The logging system comprises a plurality of connectors for connecting different components in various devices in the logging system, wherein the connectors adopt mechanically fastened pin heads, wherein the connectors adopt ITT high temperature connectors.

7. The well logging system according to any one of claims 1 to 6, characterized in that: The logging system further comprises: A circuit failure detection device is used to perform failure detection on solder joints and circuit boards in various devices constituting the well logging system to evaluate the quality of the solder joints and circuit boards, wherein: Solder joint inspection includes but is not limited to appearance inspection, X-ray inspection and metallographic analysis. Circuit board inspection includes but is not limited to appearance inspection, dielectric withstand voltage inspection, moisture resistance and insulation resistance inspection and metallographic analysis.

8. The well logging system according to any one of claims 1 to 7, characterized in that: The data acquisition device is also used to analyze the gamma information from different strata and convert the gamma information into corresponding API data to obtain the first mud content of the corresponding strata.

9. The well logging system according to claim 8, characterized in that: The imaging device is also used to count the gamma values ​​belonging to different sectors in the gamma information in real time, and distribute the count values ​​to the corresponding sectors in real time to obtain a second mud content of the corresponding formation, and then use the second mud content to correct the first mud content to obtain the actual mud content of the corresponding formation.

10. A logging method based on azimuthal gamma imaging while drilling, characterized in that: The well logging method is implemented using the well logging system according to any one of claims 1 to 9, wherein the well logging method comprises: The sector configuration device divides the well circumference into a plurality of sectors according to preset azimuth intervals; During the measurement while drilling, the motion parameters of the gamma sensor and the gamma information in the formation collected by the gamma sensor are collected in real time by the data acquisition device, and the magnetic tool face information is collected in real time by the tool face measurement device; The tool face measurement device combines the magnetic tool face information with the motion parameters to obtain a dynamic gravity tool face to determine the actual distribution of the gamma information in each sector; The imaging device generates dynamic while-drilling azimuthal gamma imaging according to the actual distribution of the gamma information in each sector.

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