A Memory-Type Logging High Temperature and High Pressure Battery Subsection and Its Control Method

Abstract

The invention discloses a novel storage-type logging high-temperature and high-pressure battery sub and its control method. The sub includes an upper cap, a snap ring, a retaining ring, a screw sleeve, an upper socket assembly, an upper steel cylinder, a battery assembly, a circuit skeleton assembly, a pressure sensor, a key, a first ring, a second ring, an intermediate screw sleeve, a lower steel cylinder, a pressure-bearing disc and a lower cap. The upper cap is connected to the upper steel cylinder by threads, and the lower cap is connected to the lower steel cylinder by threads. The upper socket assembly, the battery assembly and the circuit skeleton assembly are connected into a whole by screws to form a battery skeleton assembly, which is centered and placed inside the upper steel cylinder. The snap ring, the retaining ring and the screw sleeve are fixed on the upper joint of the upper steel cylinder. The pressure sensor is fixed on the upper steel cylinder by threads. The lower steel cylinder is connected to the upper steel cylinder through the key, the first ring, the second ring and the intermediate screw sleeve. The pressure-bearing disc is fixed inside the lower steel cylinder by a circlip. The battery sub disclosed by the invention realizes the production of high-temperature batteries, can work well in high-temperature and high-pressure ultra-deep wells at 200 °C and 200 MPa, and supplies power to measuring instruments.

Description

Technical Field

[0001] The present invention belongs to the field of oil well logging, and particularly relates to a high-temperature and high-pressure resistant battery sub-section for powering a high-temperature storage well logging instrument in this field and its control method. Background Art

[0002] For ultra-deep horizontal well logging, the highest temperature in the well reaches 200 °C and the highest pressure exceeds 200 MPa. High-temperature storage well logging instruments need to be used for logging, and the logging time is relatively long. Large-capacity and high-current lithium batteries are required to power the high-temperature instruments. This requires a large-capacity and high-current battery sub-section with a maximum operating temperature of 200 °C and a maximum operating pressure higher than 200 MPa to meet the power supply requirements of high-temperature storage well logging instruments.

[0003] The existing storage well logging battery sub-section can only withstand a temperature of 175 °C and a pressure of 140 MPa. Batteries with a temperature resistance of 200 °C at home and abroad are difficult to achieve high-current output and cannot meet the power supply requirements of high-temperature direct-push well logging instruments. Moreover, high-temperature batteries with a temperature resistance of 200 °C are difficult to activate at room temperature and cannot power the instrument. At the same time, problems such as overloading and over-discharging of high-temperature batteries need to be solved to avoid explosions caused by overloading and over-discharging of the batteries, resulting in accidents. For ultra-deep wells, the casing is relatively long and the measurement section is relatively short. It is necessary to effectively control the battery output and only supply power to the instrument in the measurement section to effectively utilize the battery power. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a high-temperature and high-pressure resistant battery sub-section for storage well logging in view of the deficiencies of the existing storage well logging battery sub-section, realizing the production of a battery component resistant to 200 °C high temperature, and designing an effective control method for this battery sub-section, which not only ensures the safe and reliable operation of the instrument, but also effectively utilizes the battery capacity.

[0005] The present invention adopts the following technical solutions:

[0006] A high-temperature and high-pressure resistant battery sub-section for storage well logging, the improvement lies in: including an upper cap, a snap ring, a retaining ring, a screw sleeve, an upper socket assembly, an upper steel cylinder, a battery assembly, a circuit skeleton assembly, a pressure sensor, a key, a first ring, a second ring, an intermediate screw sleeve, a lower steel cylinder, a pressure-bearing disc and a lower cap; wherein the upper cap is connected to the upper steel cylinder by threads, the lower cap is connected to the lower steel cylinder by threads, the upper socket assembly, the battery assembly and the circuit skeleton assembly are connected into an integral body by screws to form a battery skeleton assembly, the battery skeleton assembly is centered and placed inside the upper steel cylinder, the snap ring, the retaining ring and the screw sleeve are fixed on the upper joint of the upper steel cylinder, the pressure sensor is fixed on the upper steel cylinder by threads, the lower steel cylinder is connected to the upper steel cylinder through the key, the first ring, the second ring and the intermediate screw sleeve, and the pressure-bearing disc is fixed inside the lower steel cylinder by a circlip.

[0007] Further, a PEEK retaining ring and an O-ring are provided between the upper cap and the snap ring.

[0008] Further, the pressure-bearing outer shell is composed of an upper steel cylinder and a lower steel cylinder, and the pressure-bearing outer shell is made of titanium alloy material.

[0009] Further, the battery skeleton assembly includes a positive 24-core socket, a 24-core socket housing, a coiled pin, a compression spring, a connecting sleeve, a 0-core connector, a first screw, an upper joint, an O-ring, a second screw, a battery assembly, a shock-absorbing ring, a third screw, a power module, a skeleton, a transfer control circuit, a battery measurement circuit, a countersunk screw, a positioning pin, a lower fixing shell of the 24-core socket, and a reverse 24-core socket;

[0010] Among them, the upper socket assembly is composed of a positive 24-core socket, a 24-core socket housing, a coiled pin, a compression spring, a connecting sleeve, a 0-core connector, a first screw, an upper joint, and an O-ring connected in sequence;

[0011] The circuit skeleton assembly is composed of a shock-absorbing ring, a third screw, a power module, a skeleton, a transfer control circuit, a battery measurement circuit, a countersunk screw, a positioning pin, a lower fixing shell of the 24-core socket, and a reverse 24-core socket connected in sequence;

[0012] The upper socket assembly, the circuit skeleton assembly, and the battery assembly are connected together by a second screw to form the battery skeleton assembly.

[0013] Further, the upper socket assembly and the circuit skeleton assembly are electrically connected to the instruments outside the battery stub through connectors. The upper socket assembly is connected to the upper joint of the battery assembly through a quick-lock high-temperature connector and a fixing screw. The lower joint of the battery assembly is connected to the circuit skeleton assembly through a fixing screw and a high-temperature connector.

[0014] Further, the transfer control circuit and the battery measurement circuit include a control circuit, a measurement circuit, and a processor. Among them, the battery assembly is electrically connected to the lower joint of the instrument through the control circuit. The processor is electrically connected to the control circuit and the measurement circuit respectively. The measurement circuit measures the voltage and current output by the battery assembly, the temperature inside the battery assembly, and the pressure outside the battery stub. The power module of the circuit skeleton assembly supplies power to the control circuit and the measurement circuit.

[0015] Further, the battery assembly is composed of a plurality of batteries and a battery housing. The batteries are made of high-porosity alloy lithium material. A one-way diode and an overcurrent fuse resistor are arranged between the batteries. The batteries are connected by high-strength springs to form a battery pack. After the battery pack is placed in the battery housing, high-temperature polyimide glue is poured in for fixation. The battery housing is made of high-temperature glass fiber material. In addition, a temperature sensor is also arranged inside the battery assembly.

[0016] A control method applicable to the above-mentioned battery short section, and the improvement lies in: including an overload and overcurrent control method and a battery capacity utilization control method;

[0017] Overload and overcurrent control method: When the output current of the battery assembly continuously exceeds the set threshold for 0.5 seconds, the processor automatically shuts off the output of the battery assembly through the control circuit; when the output voltage of the battery assembly continuously is less than the set threshold for 1 second, the processor automatically shuts off the output of the battery assembly through the control circuit; when the temperature inside the battery assembly continuously exceeds the set threshold for 5 seconds, the processor automatically shuts off the output of the battery assembly through the control circuit; all the above thresholds are set on the ground before logging;

[0018] Battery capacity utilization control method: Before the start of logging, set the delay power-on time, delay power-off time and power-off pressure threshold for the battery assembly. The delay power-on time is 1 hour before it is estimated that the instrument reaches the measurement section during the downhole drilling. The delay power-off time is 2 hours before it is estimated that the instrument reaches the end of the measurement section during the uphole drilling. The power-off pressure threshold is the wellbore annulus pressure value when the instrument reaches the end of the measurement section during the uphole drilling minus 3 MPa. The wellbore annulus pressure value is calculated by multiplying the well vertical depth by the wellbore mud specific gravity. The above instrument refers to the instrument powered by the battery short section.

[0019] The beneficial effects of the present invention are:

[0020] The battery short section disclosed by the present invention realizes the production of high-temperature batteries and can work well in high-temperature and high-pressure ultra-deep wells of 200 °C and 200 MPa to supply power to the measuring instrument.

[0021] The control method disclosed by the present invention can effectively protect the battery assembly against under-voltage and over-current. By monitoring the temperature inside the battery assembly, it can avoid the overheating and explosion of the battery, playing a safety protection role. By setting parameters such as the delay power-on time, delay power-off time and wellbore annulus pressure, the usage time of the battery can be effectively controlled according to the length of the measurement well section, improving the battery usage efficiency. Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of the battery short section disclosed in Embodiment 1 of the present invention;

[0023] Figure 2 is a schematic structural diagram of the battery skeleton assembly in the battery short section disclosed in Embodiment 1 of the present invention;

[0024] Figure 3 is a connection block diagram of the control circuit and the measurement circuit in the battery short section disclosed in Embodiment 1 of the present invention.

[0025] Figure numerals: 1—upper cap, 2—PEEK retaining ring, 3—O-ring, 4—snapping ring, 5—retaining ring, 6—screw sleeve, 7—upper socket assembly, 8—upper steel cylinder, 9—battery assembly, 10—circuit skeleton assembly, 11—pressure sensor, 12—key, 13—first ring, 14—second ring, 15—middle screw sleeve, 16—lower steel cylinder, 17—pressure plate, 18—lower cap; 21—positive 24-core socket, 22—24-core socket housing, 23—coil Pin 23, 24—compression spring, 25—connecting sleeve, 26—0-core connector, 27—first screw, 28—upper joint, 29—O-ring, 210—second screw, 212—shock-absorbing ring, 213—third screw, 214—power module, 215—skeleton, 216—transfer control circuit, 217—battery measurement circuit, 218—countersunk screw, 219—locating pin, 220—24-core socket lower fixing shell, 221—reverse 24-core socket. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] Embodiment 1, as Figure 1 As shown, this embodiment discloses a storage-type logging high-temperature and high-pressure resistant battery short section, including an upper cap 1, a retaining ring 4, a retaining ring 5, a screw sleeve 6, an upper socket assembly 7, an upper steel cylinder 8, a battery assembly 9, a circuit skeleton assembly 10, a pressure sensor 11, a key 12, a first ring 13, a second ring 14, an intermediate screw sleeve 15, a lower steel cylinder 16, a pressure plate 17 (pressure-bearing connector) and a lower cap 18; wherein the upper cap is connected to the upper steel cylinder by a thread, the lower cap is connected to the lower steel cylinder by a thread, the upper socket assembly, the battery assembly and the circuit skeleton assembly are connected to form a battery skeleton assembly by screws, the battery skeleton assembly is centrally placed in the upper steel cylinder, the retaining ring, the retaining ring and the screw sleeve are fixed to the upper joint of the upper steel cylinder, the pressure sensor is fixed to the upper steel cylinder by a thread, the pressure sensor is used to measure the wellbore annulus pressure, and the wellbore annulus pressure can be used for instrument power-off control. The lower steel cylinder is connected with the upper steel cylinder through a key, a first ring, a second ring and a middle screw sleeve. The pressure plate is fixed in the lower steel cylinder through a retaining ring. The pressure plate enables the battery short section to have an anti-flooding function.

[0028] In this embodiment, a PEEK retaining ring 2 and an O-ring 3 are arranged between the upper cover cap 1 and the clamping ring 4 .

[0029] The pressure-bearing outer shell is composed of an upper steel cylinder and a lower steel cylinder. The battery assembly and the circuit skeleton assembly are placed inside the pressure-bearing outer shell. The pressure-bearing outer shell is made of high-strength titanium alloy material with excellent yield strength, ensuring reliable pressure-bearing at high temperature and high pressure conditions of 200°C and 200 MPa, without being crushed or leaking.

[0030] As Figure 2 shown, the battery skeleton assembly includes a positive 24-core socket 21, a 24-core socket housing 22, a coiled pin 23 (3x10), a compression spring 24, a connecting sleeve 25, a 0-core connector 26, a first screw 27 (M4x6), an upper joint 28, an O-ring 29, a second screw 210 (M4x10), a battery assembly 9, a shock-absorbing ring 212, a third screw 213 (M2x8), a power module 214, a skeleton 215, a transfer control circuit 216, a battery measurement circuit 217, a countersunk head screw 218, a positioning pin 219, a 24-core socket lower fixing shell 220, and a reverse 24-core socket 221;

[0031] Among them, the upper socket assembly 7 is composed of the positive 24-core socket 21, the 24-core socket housing 22, the coiled pin 23, the compression spring 24, the connecting sleeve 25, the 0-core connector 26, the first screw 27, the upper joint 28, and the O-ring 29 connected together in sequence;

[0032] The circuit skeleton assembly 10 is composed of the shock-absorbing ring 212, the third screw 213, the power module 214, the skeleton 215, the transfer control circuit 216, the battery measurement circuit 217, the countersunk head screw 218, the positioning pin 219, the 24-core socket lower fixing shell 220, and the reverse 24-core socket 221 connected together in sequence;

[0033] The upper socket assembly 7, the circuit skeleton assembly 10, and the battery assembly 9 are connected together by the second screw 210 to form the battery skeleton assembly.

[0034] The upper socket assembly and the circuit skeleton assembly are electrically connected to other instruments outside the battery stub through connectors. The upper socket assembly is connected to the upper joint of the battery assembly through a quick-lock high-temperature connector and a fixing screw. The lower joint of the battery assembly is connected to the circuit skeleton assembly through a fixing screw and a high-temperature connector.

[0035] As Figure 3 shown, the transfer control circuit and the battery measurement circuit include a control circuit, a measurement circuit, and a processor. Among them, the battery assembly is electrically connected to the lower joint of the instrument through the control circuit. The processor is electrically connected to the control circuit and the measurement circuit respectively. The measurement circuit measures the voltage and current output by the battery assembly, the temperature inside the battery assembly, and the pressure outside the battery stub. The power module of the circuit skeleton assembly supplies power to the control circuit and the measurement circuit.

[0036] The processor MCU uses dsPIC33FJ256GP710 and can work reliably in an environment of 200 °C. It mainly completes data acquisition and performs undervoltage, overload, and overtemperature protection control according to the temperature, battery voltage, and current status within the battery module. The battery output is shut off by setting the delay time and the wellbore annulus pressure.

[0037] Specifically, the processor records and stores the battery capacity and working duration according to the voltage and current output by the battery module for viewing the battery usage status; monitors the voltage and current output by the battery module for overload and overcurrent protection; monitors the temperature within the battery module to avoid accidents caused by too high a temperature of the battery module. The processor sets the battery power-on delay time and controls the battery power-on and power-off according to the power-on delay time and the external pressure of the instrument.

[0038] The measurement circuit consists of a high-temperature amplifier circuit OPA2333 with a maximum working temperature of 210 °C, which mainly completes the amplification and signal processing of the wellbore annulus pressure, the temperature within the battery module, the battery voltage, and the current.

[0039] The control circuit consists of a COMS device IXTK60N50L2 and can be reliably controlled according to the output level of the MCU.

[0040] All circuit components are selected as high-temperature-resistant devices and are screened through high-temperature tests to ensure that the circuit can work reliably under high-temperature conditions of 200 °C.

[0041] The battery module consists of several batteries and a battery housing. The batteries are made of high-porosity alloy lithium materials, which can ensure large-capacity and large-current output in a high-temperature environment. One-way diodes and overcurrent fuse resistors are set between the batteries for overload and overcurrent protection to avoid accidents caused by battery short circuits. The batteries are connected by high-strength springs to form a battery pack, which can ensure full and tight cooperation between the battery electrodes and the carbon electrodes, reducing the internal resistance of the battery pack. After the battery pack is placed in the battery housing, high-temperature polyimide glue is poured in for fixation, which plays a role in resisting impact and vibration, ensuring stable battery load voltage and small fluctuations during high discharge, making the entire battery module expand less under high-temperature conditions, and avoiding safety accidents caused by battery extrusion due to the expansion of the battery module, meeting the power supply requirements of the logging instrument. The battery housing uses high-temperature fiberglass materials with a small coefficient of thermal expansion. In addition, a temperature sensor is set within the battery module to monitor the temperature within the battery module. When the temperature is higher than 210 °C, the battery output is shut off in a timely manner to avoid explosion accidents caused by battery overheating.

[0042] This embodiment also discloses a control method, which is applicable to the above-mentioned battery short section and includes an overload and overcurrent control method and an effective utilization of battery capacity control method;

[0043] Overload and overcurrent control method: When the output current of the battery assembly is continuously greater than the set threshold for 0.5 seconds, the processor automatically shuts off the output of the battery assembly through the control circuit; when the output voltage of the battery assembly is continuously less than the set threshold for 1 second, the processor automatically shuts off the output of the battery assembly through the control circuit; when the temperature inside the battery assembly is continuously greater than the set threshold for 5 seconds, the processor automatically shuts off the output of the battery assembly through the control circuit; thereby achieving the purpose of protecting the battery. All of the above thresholds are set on the ground before logging;

[0044] Effective utilization of battery capacity control method: Before the start of logging, set the delay power-on time, delay power-off time, and power-off pressure threshold for the battery assembly. The delay power-on time is 1 hour before the well team estimates that the instrument reaches the measurement section during the downhole drilling. The delay power-off time is 2 hours before the well team estimates that the instrument reaches the end of the measurement section during the uphole drilling. The power-off pressure threshold is the wellbore annulus pressure value when the instrument reaches the end of the measurement section during the uphole drilling minus 3 MPa. The wellbore annulus pressure value is calculated by multiplying the well vertical depth by the wellbore mud specific gravity. The above instrument refers to the instrument powered by the battery sub.

Claims

1. A storage type logging high temperature and high pressure battery sub, characterized in that: It includes an upper cap, a snap ring, a retaining ring, a screw sleeve, an upper socket assembly, an upper steel cylinder, a battery assembly, a circuit skeleton assembly, a pressure sensor, a key, a first ring, a second ring, an intermediate screw sleeve, a lower steel cylinder, a pressure-bearing disc and a lower cap; wherein the upper cap is connected to the upper steel cylinder by threads, the lower cap is connected to the lower steel cylinder by threads, the upper socket assembly, the battery assembly and the circuit skeleton assembly are connected into an integrated battery skeleton assembly by screws, the battery skeleton assembly is centered and placed inside the upper steel cylinder, the snap ring, the retaining ring and the screw sleeve are fixed on the upper joint of the upper steel cylinder, the pressure sensor is fixed on the upper steel cylinder by threads, the lower steel cylinder is connected to the upper steel cylinder through the key, the first ring, the second ring and the intermediate screw sleeve, and the pressure-bearing disc is fixed inside the lower steel cylinder by a circlip; a PEEK retaining ring and an O-ring are arranged between the upper cap and the snap ring; the battery skeleton assembly includes a positive 24-core socket, a 24-core socket housing, a coiled pin, a compression spring, a connecting sleeve, a 0-core connector, a first screw, an upper joint, an O-ring, a second screw, a battery assembly, a shock-absorbing ring, a third screw, a power module, a skeleton, a transfer control circuit, a battery measurement circuit, a countersunk screw, a positioning pin, a lower fixed housing of the 24-core socket and a negative 24-core socket; Wherein the upper socket assembly is composed of the positive 24-core socket, the 24-core socket housing, the coiled pin, the compression spring, the connecting sleeve, the 0-core connector, the first screw, the upper joint and the O-ring connected in sequence; The circuit skeleton assembly is composed of the shock-absorbing ring, the third screw, the power module, the skeleton, the transfer control circuit, the battery measurement circuit, the countersunk screw, the positioning pin, the lower fixed housing of the 24-core socket and the negative 24-core socket connected in sequence; The upper socket assembly, the circuit skeleton assembly and the battery assembly are connected together by a second screw to form a battery skeleton assembly.

2. The storage type logging high temperature and high pressure battery sub-section according to claim 1, characterized in that: The pressure-bearing outer shell is composed of the upper steel cylinder and the lower steel cylinder, and the pressure-bearing outer shell is made of titanium alloy material.

3. The storage type logging high temperature and high pressure battery sub-section according to claim 1, wherein: The upper socket assembly and the circuit skeleton assembly are electrically connected to the instrument outside the battery stub through connectors. The upper socket assembly is connected to the upper joint of the battery assembly through a quick-lock high-temperature connector and a fixing screw, and the lower joint of the battery assembly is connected to the circuit skeleton assembly through a fixing screw and a high-temperature connector.

4. The storage type logging high temperature and high pressure battery sub-section according to claim 1, wherein: The transfer control circuit and the battery measurement circuit include a control circuit, a measurement circuit and a processor. Wherein the battery assembly is electrically connected to the lower joint of the instrument through the control circuit, the processor is electrically connected to the control circuit and the measurement circuit respectively, the measurement circuit measures the voltage and current output by the battery assembly, the temperature inside the battery assembly and the pressure outside the battery stub, and the power module of the circuit skeleton assembly supplies power to the control circuit and the measurement circuit.

5. The storage type logging high temperature and high pressure battery sub-section according to claim 1, wherein: The battery assembly is composed of a plurality of batteries and a battery housing. The batteries are made of high-porosity alloy lithium material. One-way diodes and overcurrent fusing resistors are arranged between the batteries. The batteries are connected by high-strength springs to form a battery pack. After the battery pack is placed in the battery housing, high-temperature polyimide glue is poured in for fixation. The battery housing is made of high-temperature fiberglass material. In addition, a temperature sensor is also arranged inside the battery assembly.

6. A control method, applicable to the battery short section described in claim 4, characterized in that: It includes an overload and overcurrent control method and a method for controlling using battery capacity; Overload and overcurrent control method: When the output current of the battery module is continuously greater than the set threshold for 0.5 seconds, the processor automatically shuts off the output of the battery module through the control circuit; when the output voltage of the battery module is continuously less than the set threshold for 1 second, the processor automatically shuts off the output of the battery module through the control circuit; when the temperature inside the battery module is continuously greater than the set threshold for 5 seconds, the processor automatically shuts off the output of the battery module through the control circuit; all of the above thresholds are set on the ground before logging. Battery capacity control method: Before the start of logging, set the delay power-on time, delay power-off time, and power-off pressure threshold for the battery module. The delay power-on time is 1 hour before the estimated instrument reaches the measurement section during downhole drilling. The delay power-off time is 2 hours before the estimated instrument reaches the end of the measurement section during tripping out. The power-off pressure threshold is the wellbore annulus pressure value when the instrument reaches the end of the measurement section during tripping out minus 3 MPa. The wellbore annulus pressure value is calculated by multiplying the well vertical depth by the wellbore mud specific gravity. The above instrument refers to the instrument powered by the battery sub.

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