Logging equipment and control method thereof

Abstract

The invention provides logging equipment and a control method thereof, and the logging equipment comprises a logging instrument, an AC / DC power supply unit and a control unit. The input end of the alternating-current and direct-current power supply unit is connected with different types of currents, the types of the currents comprise direct current and alternating current, and the output end of the alternating-current and direct-current power supply unit is connected with the input end of the logging instrument; the control unit is used for determining the type of the access current of the AC / DC power supply unit, and controlling the AC / DC power supply unit to supply power to the logging instrument in a DC power supply mode when the type of the current is DC; when the type of the current is alternating current, the alternating-current and direct-current power supply unit is controlled to supply power to the logging instrument in an alternating-current power supply mode, the same logging device supports dual-mode power supply of the direct-current power supply mode and the alternating-current power supply mode, and therefore the same logging device can conduct cable mode logging and can also conduct storage type logging. Not only is the field construction efficiency improved, but also the acquisition cost of logging equipment is saved.

Description

Technical Field

[0001] The present disclosure relates to the field of well logging technology, and in particular to a well logging device and a control method thereof. Background Art

[0002] Well logging, also known as geophysical logging or oil logging, or logging for short, is a method of measuring geophysical parameters by using the geophysical properties of rock formations, such as electrochemical properties, conductive properties, acoustic properties, and radioactivity. It is one of the applied geophysical methods.

[0003] At present, the main logging equipment includes cable logging tools and storage logging tools. Among them, the storage logging tool is only powered by batteries, while the cable logging tool is only powered by AC. Therefore, the existing logging equipment can neither support AC power supply nor DC power supply. This brings great limitations to the application of logging equipment, not only affecting the construction efficiency, but also increasing the purchase cost of logging equipment. Summary of the invention

[0004] The following is a summary of the subject matter of the detailed description of the present disclosure. This summary is not intended to limit the scope of the claims.

[0005] The present disclosure provides a well logging device and a control method thereof.

[0006] A first aspect of the present disclosure provides a well logging device, the well logging device comprising: a well logging instrument, an AC / DC power supply unit and a control unit;

[0007] The input end of the AC / DC power supply unit is connected to different types of currents, including direct current and alternating current, and the output end of the AC / DC power supply unit is connected to the input end of the logging instrument;

[0008] The control unit is used to determine the type of current connected to the AC / DC power supply unit. When the type of the current is DC, the control unit controls the AC / DC power supply unit to use the DC power supply mode to supply power to the logging instrument; when the type of the current is AC, the control unit controls the AC / DC power supply unit to use the AC power supply mode to supply power to the logging instrument.

[0009] In some exemplary embodiments, the control unit is further configured to control the AC / DC power supply unit to provide DC power to the logging instrument using the AC power supply mode.

[0010] In some exemplary embodiments, the logging device further comprises a filtering unit, and the filtering unit is connected in parallel between the output end of the AC / DC power supply unit and the input end of the logging instrument;

[0011] The filtering unit is used to filter the direct current output by the AC / DC power supply unit to obtain stable direct current.

[0012] In some exemplary embodiments, the AC / DC power supply unit includes a DC power supply unit and an AC power supply unit;

[0013] The input end of the DC power supply unit is connected to DC power, the input end of the AC power supply unit is connected to AC power, and the output end of the DC power supply unit and the output end of the AC power supply unit are both connected to the input end of the filter unit;

[0014] The control unit is used to control the DC power supply unit to access the DC power or control the AC power supply unit to access the AC power.

[0015] In some exemplary embodiments, the AC power supply unit includes a voltage transformation processing unit and an AC / DC conversion unit;

[0016] The input end of the voltage transformation processing unit is connected to the alternating current, the output end of the voltage transformation processing unit is connected to the input end of the AC / DC conversion unit, and the output end of the AC / DC conversion unit is connected to the input end of the filtering unit;

[0017] The voltage transformation processing unit is used to adjust the direct current to a preset voltage range;

[0018] The AC / DC conversion unit is used to perform DC conversion processing on the adjusted AC power to obtain DC power input to the well logging instrument.

[0019] In some exemplary embodiments, the output terminal of the DC power supply unit is connected to the input terminal of the AC / DC conversion unit;

[0020] The control unit is further configured to control the polarity of the direct current output by the AC / DC conversion unit to remain consistent when the type of the current is direct current.

[0021] In some exemplary embodiments, the logging device further comprises an isolation unit, and the output end of the voltage transformation processing unit is connected in series with the isolation unit and then connected to the input end of the AC / DC conversion unit;

[0022] The isolation unit is used to isolate the direct current so that the direct current is transmitted to the logging instrument in a unidirectional manner.

[0023] In some exemplary embodiments, the output end of the DC power supply unit is connected to the output end of the AC / DC conversion unit, a diode is connected in series in the DC power supply unit, and the DC power passes through the diode and is then input to the input end of the filter unit.

[0024] A second aspect of the present disclosure provides a control method for a well logging device, the control method being applied to the well logging device according to the first aspect, the control method comprising:

[0025] Determining the type of input current, wherein the type of current includes direct current and alternating current;

[0026] When the type of the current is direct current, the control adopts a direct current power supply mode to supply power to the logging instrument; when the type of the current is alternating current, the control adopts an alternating current power supply mode to supply power to the logging instrument.

[0027] In some exemplary embodiments, the control method includes: using the AC power supply mode to provide direct current to the logging instrument.

[0028] In some exemplary embodiments, the alternating current includes alternating current provided from the surface via a logging cable; and the direct current includes direct current provided by a battery.

[0029] In some exemplary embodiments, before supplying power to the logging instrument, the control method further includes:

[0030] The direct current is filtered to obtain stable direct current.

[0031] In some exemplary embodiments, controlling the use of the AC power supply mode to provide DC power to the logging tool includes:

[0032] Determining a voltage conversion coefficient based on the direct current and the alternating current, and adjusting the alternating current to a preset voltage range based on the voltage conversion coefficient;

[0033] The adjusted alternating current is subjected to direct current conversion processing to obtain direct current input to the well logging instrument.

[0034] In some exemplary embodiments, controlling the use of a DC power supply mode to supply power to the logging tool includes:

[0035] The direct current is controlled to be transmitted unidirectionally to the logging instrument.

[0036] In some exemplary embodiments, controlling the DC power supply mode to supply power to the well logging instrument includes:

[0037] When the polarity of the DC power input is opposite, the polarity of the DC power input to the logging instrument is controlled to remain consistent.

[0038] In an exemplary embodiment of the present disclosure, a logging device and a control method thereof are provided, in which the logging instrument can support multiple power supply modes, that is, the same logging device supports dual-mode power supply of DC power supply mode and AC power supply mode, thereby realizing that the same logging device can perform cable mode logging through AC power supply and storage mode logging through DC power supply, and can quickly switch between cable mode and storage mode, thereby reducing costs, improving construction efficiency, and saving the purchase cost of the logging equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings incorporated into the specification and constituting a part of the specification illustrate embodiments of the present disclosure and are used together with the description to explain the principles of the embodiments of the present disclosure. In these drawings, similar reference numerals are used to represent similar elements. The drawings described below are some embodiments of the present disclosure, rather than all embodiments. For those skilled in the art, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 is a schematic diagram of a well logging device according to an exemplary embodiment;

[0041] Figure 2 is a schematic diagram of a well logging device according to another exemplary embodiment;

[0042] Figure 3 is a schematic diagram of an AC / DC power supply unit in a well logging device according to an exemplary embodiment;

[0043] Figure 4 is a schematic diagram of an AC / DC power supply unit in a well logging device according to another exemplary embodiment;

[0044] Figure 5 is a flow chart showing a method for controlling a well logging device according to an exemplary embodiment;

[0045] Figure 6 The figure is a flow chart of a method for controlling a well logging device according to another exemplary embodiment. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions in the disclosed embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present disclosure. It should be noted that, in the absence of conflict, the embodiments in the present disclosure and the features in the embodiments can be arbitrarily combined with each other. The present disclosure is further described below in conjunction with the embodiments shown in the drawings.

[0047] A logging device is provided in an exemplary embodiment of the present disclosure. The logging device is capable of supporting multiple power supply modes, that is, the same logging device supports dual-mode power supply of a DC power supply mode and an AC power supply mode. The same logging device can further be used for both cable mode logging through AC power supply and storage mode logging through DC power supply, which not only improves on-site construction efficiency but also saves the purchase cost of the logging equipment.

[0048] In an exemplary embodiment of the present disclosure, a well logging device is provided. Figure 1 As shown, Figure 1 A schematic diagram of a well logging device provided according to an exemplary embodiment of the present disclosure is shown, the well logging device comprising: a well logging instrument, an AC / DC power supply unit and a control unit; the input end of the AC / DC power supply unit can be connected to different types of current, the types of current including direct current and alternating current, and the output end of the AC / DC power supply unit is connected to the input end of the well logging instrument; the control unit is used to determine the type of current connected to the AC / DC power supply unit, when the type of current is direct current, control the AC / DC power supply unit to use a DC power supply mode to supply power to the well logging instrument; when the type of current is alternating current, control the AC / DC power supply unit to use an AC power supply mode to supply power to the well logging instrument.

[0049] The control unit is electrically connected to the AC / DC power supply unit, and the AC / DC power supply unit supports connecting different types of power supplies to provide different types of currents for the logging instrument, so as to adopt the corresponding type of power supply mode for power supply.

[0050] Among them, the types of current include direct current and alternating current, so that the AC / DC power supply unit supports both the AC power supply mode and the DC power supply mode. Direct current can be provided by a direct current power supply that generates direct current, such as a direct current generator or a chemical energy battery pack, to power the logging instrument to realize storage logging, and to use the logging equipment as a storage instrument. Alternating current is provided by an alternating current power supply that can generate alternating current, such as a logging cable, and the cable core of the logging cable can be used to power the logging instrument to realize cable logging, and to use the logging equipment as a cable logging instrument, so that the logging equipment can be quickly switched between the cable mode and the storage mode, reducing costs and improving construction efficiency.

[0051] Among them, the cable logging instrument is a logging instrument that lowers the logging instrument into the wellbore through a cable, and logging can be performed during the process of lifting or lowering. The logging data is uploaded to the ground system in real time through the cable for recording and storage. The storage logging instrument is a logging instrument that transports the logging instrument to the wellbore through drilling tools, tubing, flexible pipes, etc. The logging instrument performs logging during the lowering, lifting or drilling process, and stores the logging data in real time in the storage unit of the logging instrument. After the logging instrument is pulled out of the wellbore, the logging data is read from the storage unit of the logging instrument.

[0052] Exemplarily, the well logging instrument may have devices that support AC power circuits and DC power circuits. When an AC / DC power supply unit that can realize AC power supply mode or DC power supply mode is applied to the well logging instrument, AC power or DC power can be connected according to actual usage conditions, and the well logging instrument can realize AC and DC dual-mode power supply. Exemplarily, when the AC / DC power supply unit is connected to DC power, the AC / DC power supply unit is controlled to use the DC power supply mode to provide DC power to the well logging instrument; when the AC / DC power supply unit is connected to AC power, the AC / DC power supply unit is controlled to use the AC power supply mode to provide AC power to the well logging instrument.

[0053] Exemplarily, the well logging instrument may also be other electrical equipment that requires direct current to work, wherein the control unit may control the AC / DC power supply unit to adopt a DC power supply mode or an AC power supply mode to provide direct current to the well logging instrument. In this embodiment, exemplarily, the well logging instrument is, for example, a downhole instrument. When the working current of the downhole instrument supports direct current, when an AC / DC power supply unit that can realize an AC power supply mode or a DC power supply mode is applied to the downhole instrument, the downhole instrument can realize AC and DC dual-mode power supply. Exemplarily, when the AC / DC power supply unit is connected to direct current, the AC / DC power supply unit is controlled to adopt a DC power supply mode to provide direct current to the well logging instrument; when the AC / DC power supply unit is connected to alternating current, the AC / DC power supply unit is controlled to adopt an AC power supply mode to provide direct current to the well logging instrument, thereby realizing two working modes on the same downhole instrument, namely, cable mode well logging through AC power supply and storage mode well logging through DC power supply, thereby improving the efficiency of on-site construction.

[0054] In an exemplary embodiment of the present disclosure, a well logging device is provided. Figure 2 As shown, Figure 2 A schematic diagram of a logging device provided according to an exemplary embodiment of the present disclosure is shown. Most of the contents of the logging device of this embodiment are the same as those of the above embodiments. The difference between this embodiment and the above embodiments is that the AC / DC power supply unit includes a DC power supply unit and an AC power supply unit. The control unit is used to control the AC / DC power supply unit to adopt a DC power supply mode or an AC power supply mode to provide DC power to the logging instrument. A filtering unit is provided between the AC / DC power supply unit and the logging instrument. The filtering unit is used to filter the DC power output by the AC / DC power supply unit to obtain stable DC power.

[0055] In this embodiment, a DC power supply unit for connecting DC power and an AC power supply unit for connecting AC power are provided in the AC / DC power supply unit to provide DC power or AC power to the AC / DC power supply unit, so that the AC / DC power supply unit is connected to DC power or the AC power supply unit is connected to AC power, and the control unit controls the use of the corresponding power supply mode to provide DC power to the logging instrument.

[0056] refer to Figure 2 As shown, in this embodiment, a filtering unit is connected in parallel between the AC / DC power supply unit and the logging instrument, and the filtering unit is used to filter the DC power output by the AC / DC power supply unit, so as to obtain a stable DC power that is basically not affected by the outside world, and input it to the logging instrument for use by the logging instrument. The voltage fluctuation of the stable DC power is small, which can ensure the stability and reliability of the power supply, so as to meet the occasions with high requirements on power supply accuracy.

[0057] Figure 3 A well logging device is shown according to an exemplary embodiment. Figure 3 The logging equipment provided in this embodiment is Figure 2 Based on the schematic diagram shown in FIG. 1 , an optional implementation of the AC / DC power supply unit is mainly described. Figure 2 and Figure 3 As shown, the AC / DC power supply unit of this embodiment may include: a DC power supply unit and an AC power supply unit, the input end of the DC power supply unit is connected to DC power, the input end of the AC power supply unit is connected to AC power, the output end of the DC power supply unit and the output end of the AC power supply unit are both connected to the input end of the filter unit, and the output end of the filter unit is connected to the input end of the logging instrument; a control unit is used to control the AC / DC power supply unit to connect to DC power or to connect to AC power.

[0058] The DC power supply unit at least includes a DC power supply bus, which includes but is not limited to two wires, and one end of the DC power supply bus is used to connect a DC power source that provides DC power. Figure 3 When the AC / DC power supply unit is connected to DC power, the DC power is connected by connecting the positive pole of the DC power supply bus to VIN+ and the negative pole to VIN-, and the other end of the DC power supply bus is connected to the input end of the filter unit C2. The filter unit C2 is, for example, a filter capacitor. The filter unit filters the DC power and directly supplies it to other circuits in the logging instrument.

[0059] refer to Figure 3 As shown, the AC power supply unit includes a transformer processing unit T1 and an AC / DC conversion unit B1, the input end of the transformer processing unit T1 is connected to the AC power, the output end of the transformer processing unit T1 is connected to the input end of the AC / DC conversion unit B1, and the output end of the AC / DC conversion unit B1 is connected to the input end of the filter unit C2. The control unit is also used to determine the voltage conversion coefficient K of the transformer processing unit T1 based on the DC power and the AC power, and control the transformer processing unit T1 to adjust the AC power to a preset voltage based on the voltage conversion coefficient K; the AC / DC conversion unit B is used to perform DC conversion processing on the adjusted AC power to obtain DC power, and the DC power is processed by the filter unit C2 and then input to the well logging instrument for use.

[0060] Among them, the input end of the voltage transformation processing unit T1 includes but is not limited to two wires, which can be connected to the alternating current on the logging cable. The alternating current enters from AC1 and AC2, and is converted to a suitable preset voltage range by the voltage transformation processing unit T1, and then input into the AC-DC conversion unit B1. The AC-DC conversion unit B1 performs DC conversion processing on the adjusted AC power and enters the filtering unit C2. After the filtering unit C2 performs filtering processing on the DC power, a stable DC power is obtained and input into the logging instrument through the V+ terminal and the V- terminal.

[0061] Among them, the voltage transformation processing unit T1 is, for example, a transformer. In the process of the voltage transformation processing unit T1 adjusting the alternating current, the control unit can determine the voltage conversion coefficient based on the effective voltage of the direct current and the alternating current provided to the well logging instrument, and the voltage transformation processing unit adjusts the alternating current to a preset voltage range based on the voltage conversion coefficient. Among them, the voltage conversion coefficient is the ratio of the voltage of the primary coil and the secondary coil of the transformer. For example, the effective value voltage of the alternating current provided is Uw, and the voltage of the direct current is Ub. For example, the voltage conversion coefficient K=Ub / (a×Uw), and a is the adjustment coefficient. Exemplarily, a is 1.2. Thereby providing stable direct current for the well logging instrument. In this example, whether the DC power supply mode or the AC power supply mode is adopted, direct current with the same voltage value can be provided to the well logging instrument.

[0062] The number of primary coils and secondary coils of the transformer is not limited to one, and the windings can be increased or decreased according to specific application requirements.

[0063] refer to Figure 3 Exemplarily, the AC / DC conversion unit B1 is, for example, a rectifier bridge, which rectifies the AC power adjusted by the transformer processing unit T1 and outputs DC power.

[0064] For example, reference Figure 3 As shown, the output end of the transformer processing unit T1 is connected to the input end of the AC / DC conversion unit B1, the output end of the DC power supply unit is connected to the output end of the AC / DC conversion unit B1, a diode is connected in series in the DC power supply unit, and the DC power passes through the diode and is input to the input end of the filter unit.

[0065] In this embodiment, the DC current in the DC power supply unit is input to the well logging instrument after passing through the diode connected in series on the circuit. Since the diode has the characteristic of unidirectional conduction, after a suitable forward voltage is applied to both ends of the diode, the diode is turned on; and if a reverse voltage is applied, the diode is cut off, so that the DC power can only be input to the well logging instrument in one direction through the diode. At the same time, this characteristic of the diode can be used to prevent the DC power supply from being connected in reverse, realize the anti-reverse connection function of the DC power supply, and avoid the catastrophic consequences caused by the reverse polarity of the DC electrode. In addition, the diode also plays a role in preventing the backflow of DC power.

[0066] Among them, reference Figure 3 The AC / DC conversion unit B1 is located before the output end of the DC power supply unit, so that the AC / DC conversion unit B1 has the function of preventing the DC power output by the DC power supply unit from entering the voltage transformation unit T1, thereby preventing the DC power from the battery from forming a loop through the AC / DC conversion unit B1 and the voltage transformation unit T1 to discharge the battery, thereby preventing additional battery power loss.

[0067] Figure 4A well logging device is shown according to an exemplary embodiment. Figure 4 The logging equipment provided in this embodiment is Figure 2 Based on the schematic diagram shown in FIG. 2 , another optional implementation of the AC / DC power supply unit is mainly described. Figure 4 As shown, the AC power supply unit includes a transformer processing unit and an AC / DC conversion unit; the input end of the transformer processing unit is connected to AC power, the output end of the transformer processing unit is connected in series with the isolation unit C1 and then connected to the input end of the AC / DC conversion unit B1, the output end of the DC power supply unit is connected to the input end of the AC / DC conversion unit, the output end of the AC / DC conversion unit is connected to the input end of the filter unit, and the output end of the filter unit is connected to the input end of the logging instrument; the control unit is also used to control the polarity of the DC power output by the AC / DC conversion unit to remain consistent when the type of current is DC power; the isolation unit is used to isolate the DC power so that the DC power is transmitted to the logging instrument in one direction.

[0068] In this embodiment, a well logging cable provides AC power from the ground to the well logging instrument, and a battery provides DC power to the well logging instrument as an example for explanation. The voltage transformation processing unit T1 is, for example, a transformer, the AC / DC conversion unit B1 is, for example, a rectifier bridge, the isolation unit C1 is, for example, a capacitor, and the filter unit C2 is, for example, a filter capacitor.

[0069] refer to Figure 4 When the logging instrument is powered by the logging cable, the AC power from the logging cable enters through AC1 and AC2. After the voltage is converted by the transformer processing unit T1, the AC power output by the secondary coil of the transformer processing unit T1 passes through the isolation unit C1 to the AC / DC conversion unit B1 for rectification, and then outputs DC power after filtering by the filter unit C2. The positive pole of the DC power is output from the V+ terminal, and the negative pole is output from the V- terminal to the logging instrument.

[0070] refer to Figure 4 When the logging instrument is powered by a battery, the positive electrode of the battery is connected to VIN+ and the negative electrode is connected to VIN- to directly supply the input end of the AC / DC conversion unit B1, and then output to the V+ terminal and V- terminal after passing through the AC / DC conversion unit B1 to supply the logging instrument. In this process, the isolation unit C1 isolates the DC power, so that the DC power can be transmitted to the logging instrument in one direction, avoiding the DC power from the battery to directly form a loop through the secondary winding of the transformer processing unit T1, and preventing additional battery power loss.

[0071] Among them, reference Figure 4The output end of the DC power supply unit and the output end of the transformer processing unit T1 are connected to the input end of the AC / DC conversion unit. The DC power output by the DC power supply unit is also used as the input signal of the AC / DC conversion unit. When the well logging instrument is powered by a battery, the AC / DC conversion unit plays a role in preventing reverse connection when the battery is reversed, so that the polarity of the DC power input to the well logging instrument remains consistent, avoiding the catastrophic consequences caused by the reverse polarity of the DC electrode from the battery. In this embodiment, the use of the AC / DC conversion unit can keep the polarity of the DC power provided to the well logging instrument by the DC power supply unit the same.

[0072] In an exemplary embodiment of the present disclosure, a control method for a well logging device is provided. Figure 5 As shown, Figure 5 A flow chart of a control method of a well logging device provided according to an exemplary embodiment of the present disclosure is shown:

[0073] Step S110: Determine the type of the input current, where the current types include direct current and alternating current.

[0074] Step S120: When the type of current is direct current, control the use of a direct current power supply mode to supply power to the logging instrument.

[0075] Step S130: When the type of current is alternating current, control the use of an alternating current power supply mode to supply power to the logging instrument.

[0076] refer to Figure 1 As shown, the AC / DC power supply unit supports connecting different types of power supplies to provide different types of currents for the logging instrument, so as to adopt corresponding types of power supply modes for power supply, that is, the AC / DC power supply unit supports both AC power supply mode and DC power supply mode.

[0077] The well logging instrument may also be an electrical device that supports both AC and DC. When an AC / DC power supply unit that can realize AC power supply mode or DC power supply mode is applied to the well logging instrument, the well logging instrument can realize AC and DC dual-mode power supply. When the AC / DC power supply unit is connected to DC power, the AC / DC power supply unit is controlled to use the DC power supply mode to provide current to the well logging instrument; when the AC / DC power supply unit is connected to AC power, the AC / DC power supply unit is controlled to use the AC power supply mode to provide current to the well logging instrument. The current provided to the well logging instrument by controlling the AC / DC power supply unit to use the AC power supply mode can be either DC or AC.

[0078] Wherein, direct current can be provided by a direct current power source that generates direct current, such as a direct current generator or a chemical energy battery pack, to supply power to the logging instrument to realize storage logging, and to use the logging equipment as a storage instrument. Alternating current is provided by an alternating current power source that can generate alternating current, such as a logging cable, and the cable core of the logging cable can be used to supply power to the logging instrument to realize cable logging, and to use the logging equipment as a cable logging instrument, so that the logging equipment can be quickly switched between the cable mode and the storage mode, reducing costs and improving construction efficiency.

[0079] A control method for logging equipment is provided in an exemplary embodiment of the present disclosure, which can realize dual-mode power supply of the same logging equipment supporting a DC power supply mode and an AC power supply mode, thereby realizing that the same logging equipment can perform cable mode logging through AC power supply and storage mode logging through DC power supply, which not only improves the on-site construction efficiency, but also saves the purchase cost of the logging equipment.

[0080] In an exemplary embodiment of the present disclosure, a control method for a well logging device is provided. Figure 6 As shown, Figure 6 A flow chart of a control method of a well logging device provided according to an exemplary embodiment of the present disclosure is shown:

[0081] Step S210: Determine the type of the input current, where the current types include direct current and alternating current.

[0082] Step S220: when the type of current is direct current, controlling the use of a direct current power supply mode to provide direct current to the logging instrument;

[0083] Step S230: when the type of current is alternating current, controlling the use of an alternating current power supply mode to provide direct current to the logging instrument;

[0084] For example, the well logging instrument may be other electrical equipment that requires direct current to work, and the AC / DC power supply unit may convert the connected direct current or alternating current into direct current that can be used by the well logging instrument, so as to provide direct current to the well logging instrument in a direct current power supply mode or an alternating current power supply mode. For example, alternating current is provided from the ground through a well logging cable to provide direct current power to the well logging instrument, or direct current is provided through a battery to provide direct current power to the well logging instrument.

[0085] Exemplarily, before controlling the use of a DC power supply mode or an AC power supply mode to provide DC power to the logging instrument, the control method further includes: filtering the DC power to obtain stable DC power.

[0086] In this embodiment, reference Figure 2A filter unit is connected in parallel between the AC / DC power supply unit and the logging instrument. The filter unit is, for example, a filter capacitor. By using the filter unit to filter the DC power supply unit and the DC power output by the AC power supply unit, a stable DC power that is basically not affected by the outside world can be obtained and input into the logging instrument for use by the logging instrument. The voltage fluctuation of the stable DC power is small, which can ensure the stability and reliability of the power supply, so as to meet the occasions with high requirements on power supply accuracy.

[0087] Exemplarily, controlling the use of an AC power supply mode to provide DC power to the logging instrument includes: determining a voltage conversion coefficient based on DC power and AC power, adjusting the AC power to a preset voltage range based on the voltage conversion coefficient; and performing DC conversion processing on the adjusted AC power to obtain DC power input to the logging instrument.

[0088] refer to Figure 3 When the type of current connected is AC, the AC needs to be reduced to obtain the required AC voltage. Therefore, the voltage conversion processing unit T1 is used to reduce the voltage of the AC. Before this, the voltage conversion coefficient K can be determined based on the effective voltage of the DC and AC provided to the logging instrument. The voltage conversion processing unit T1 adjusts the AC to a preset voltage range based on the voltage conversion coefficient K. The reduced AC voltage is then rectified by the AC / DC conversion unit B1 to become unidirectional DC, but its amplitude varies greatly (i.e., the pulsation is large). Therefore, the DC with large pulsation must pass through the filtering unit C2, so that a stable DC that is basically not affected by the outside world can be obtained and output to the logging instrument, thereby providing the logging instrument with corresponding DC.

[0089] The voltage conversion coefficient is the ratio of the voltage of the primary coil and the secondary coil of the transformer. For example, the effective value voltage of the AC power provided is Uw, and the voltage of the DC power is Ub. For example, the voltage conversion coefficient K=Ub / (a×Uw), and a is the adjustment coefficient. For example, a is 1.2. In this example, whether the DC power supply mode or the AC power supply mode is adopted, the DC power of the same voltage value can be provided to the logging instrument.

[0090] Exemplarily, controlling the use of a DC power supply mode to supply power to the well logging instrument includes: controlling the unidirectional transmission of DC power to the well logging instrument.

[0091] refer to Figure 3 As shown, in order to make DC power conduct in one direction, a diode is connected in series in the DC power supply unit on the circuit through which DC power flows, and the output end of the DC power supply unit and the output end of the AC / DC conversion unit are connected, so that DC power can only be input to the well logging instrument in one direction through the diode. The diode also prevents the DC power input to the well logging instrument from flowing back.

[0092] In addition, refer to Figure 3As shown, the AC-DC conversion unit is located before the output end of the DC power supply unit. The AC-DC conversion unit has the function of preventing the DC power output by the DC power supply unit from entering the voltage transformation processing unit T1. Therefore, the use of the AC-DC conversion unit also realizes the effect of unidirectional transmission of DC power to the logging instrument, thereby preventing the DC power from the battery from forming a loop through the AC-DC conversion unit B1 and the voltage transformation processing unit T1 to discharge the battery, thereby preventing additional battery power loss.

[0093] For example, reference Figure 4 As shown, in order to allow direct current to be unidirectionally conducted, an isolation unit is provided in the AC / DC power supply unit. When the logging instrument is powered by a battery, the isolation unit C1 isolates the direct current, thereby allowing the direct current to be unidirectionally transmitted to the logging instrument, thereby preventing the direct current from the battery from directly forming a loop through the secondary winding of the transformer processing unit T1, thereby preventing additional battery power loss.

[0094] For example, reference Figure 3 The input end of the AC power supply unit is connected to the input end of the AC / DC conversion unit, the output end of the DC power supply unit is connected to the output end of the AC / DC conversion unit, and a diode is connected in series in the DC power supply unit. Since the diode has the characteristic of unidirectional conduction, after a suitable forward voltage is applied to both ends of the diode, the diode conducts; and if a reverse voltage is applied, the diode is cut off. Therefore, this characteristic of the diode can be used to prevent the DC power supply from being connected in reverse, realize the anti-reverse connection function of the DC power supply, and avoid the catastrophic consequences caused by the reverse polarity of the DC electrode.

[0095] To further prevent this, illustratively, controlling the use of a DC power supply mode to supply power to the well logging instrument includes: when the polarity of the DC power input is opposite, controlling the polarity of the DC power input to the well logging instrument to remain consistent.

[0096] For example, reference Figure 4 After the output end of the DC power supply unit is connected in parallel with the output end of the AC power supply unit, it is connected to the input end of the AC / DC conversion unit. The DC power output by the DC power supply unit also serves as the input signal of the AC / DC conversion unit. When the logging instrument is powered by a battery, the AC / DC conversion unit plays an anti-reverse connection role when the battery is reversed, so that the polarity of the DC power input to the logging instrument remains consistent, avoiding catastrophic consequences caused by the reverse polarity of the DC electrode from the battery.

[0097] In the present disclosure, the terms "comprises", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that an article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such article or device. In the absence of more restrictions, the elements defined by the sentence "comprising..." do not exclude the presence of other identical elements in the article or device comprising the elements.

[0098] The various embodiments in the present disclosure are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0099] The protection scope of the present disclosure is not limited to the above-mentioned embodiments. Obviously, those skilled in the art can make various changes and modifications to the present disclosure without departing from the scope and spirit of the present disclosure. If these changes and modifications fall within the scope of the claims of the present disclosure and their equivalents, the intention of the present disclosure also includes these changes and modifications.

Claims

1. A well logging device, characterized in that: The logging equipment comprises: a logging instrument, an AC / DC power supply unit and a control unit; The input end of the AC / DC power supply unit is connected to different types of currents, including direct current and alternating current, and the output end of the AC / DC power supply unit is connected to the input end of the logging instrument; The control unit is used to determine the type of current connected to the AC / DC power supply unit. When the type of the current is DC, the control unit controls the AC / DC power supply unit to use the DC power supply mode to supply power to the logging instrument; when the type of the current is AC, the control unit controls the AC / DC power supply unit to use the AC power supply mode to supply power to the logging instrument.

2. The logging device according to claim 1, characterized in that: The control unit is further used to control the AC / DC power supply unit to provide DC power to the logging instrument using the AC power supply mode.

3. The logging device according to claim 1 or 2, characterized in that: The logging device further comprises a filtering unit, and the filtering unit is connected in parallel between the output end of the AC / DC power supply unit and the input end of the logging instrument; The filtering unit is used to filter the direct current output by the AC / DC power supply unit to obtain stable direct current.

4. The logging device according to claim 3, characterized in that: The AC / DC power supply unit includes a DC power supply unit and an AC power supply unit; The input end of the DC power supply unit is connected to DC power, the input end of the AC power supply unit is connected to AC power, and the output end of the DC power supply unit and the output end of the AC power supply unit are both connected to the input end of the filter unit; The control unit is used to control the DC power supply unit to access the DC power or control the AC power supply unit to access the AC power.

5. The logging device according to claim 4, characterized in that: The AC power supply unit includes a voltage transformation processing unit and an AC / DC conversion unit; The input end of the voltage transformation processing unit is connected to the alternating current, the output end of the voltage transformation processing unit is connected to the input end of the AC / DC conversion unit, and the output end of the AC / DC conversion unit is connected to the input end of the filtering unit; The voltage transformation processing unit is used to adjust the direct current to a preset voltage range; The AC / DC conversion unit is used to perform DC conversion processing on the adjusted AC power to obtain DC power input to the well logging instrument.

6. The logging device according to claim 5, characterized in that: The output end of the DC power supply unit is connected to the input end of the AC / DC conversion unit; The control unit is further configured to control the polarity of the direct current output by the AC / DC conversion unit to remain consistent when the type of the current is direct current.

7. The logging device according to claim 6, characterized in that: The logging device further comprises: an isolation unit, wherein the output end of the voltage transformation processing unit is connected in series with the isolation unit and then connected to the input end of the AC / DC conversion unit; The isolation unit is used to isolate the direct current so that the direct current is transmitted to the logging instrument in a unidirectional manner.

8. The well logging device according to claim 5, characterized in that: The output end of the DC power supply unit is connected to the output end of the AC / DC conversion unit. A diode is connected in series in the DC power supply unit. The DC power passes through the diode and is input to the input end of the filter unit.

9. A control method for a well logging device, the control method being applied to the well logging device according to any one of claims 1 to 8, characterized in that: The control method comprises: Determining the type of input current, wherein the type of current includes direct current and alternating current; When the type of the current is direct current, the control adopts a direct current power supply mode to supply power to the logging instrument; when the type of the current is alternating current, the control adopts an alternating current power supply mode to supply power to the logging instrument.

10. The control method of the well logging equipment according to claim 9, characterized in that: The control method comprises: adopting the AC power supply mode to provide direct current to the logging instrument.

11. The control method of the well logging equipment according to claim 10, characterized in that: The alternating current includes alternating current provided from the ground through a logging cable; and the direct current includes direct current provided by a battery.

12. The control method of the well logging equipment according to claim 10, characterized in that: Before supplying power to the logging instrument, the control method further includes: The direct current is filtered to obtain stable direct current.

13. The control method of the well logging equipment according to claim 12, characterized in that: Controlling the use of the AC power supply mode to provide DC power to the logging instrument includes: Determining a voltage conversion coefficient based on the direct current and the alternating current, and adjusting the alternating current to a preset voltage range based on the voltage conversion coefficient; The adjusted alternating current is subjected to direct current conversion processing to obtain direct current input to the well logging instrument.

14. The control method of the well logging equipment according to claim 9, characterized in that: Controlling the use of a DC power supply mode to supply power to the logging instrument includes: The direct current is controlled to be transmitted unidirectionally to the logging instrument.

15. The control method of the well logging equipment according to claim 9, characterized in that: Controlling the use of the DC power supply mode to supply power to the logging instrument includes: When the polarity of the DC power input is opposite, the polarity of the DC power input to the logging instrument is controlled to remain consistent.

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