In-situ determination method and device for stratum thermophysical parameters, terminal and storage medium

Abstract

The invention provides an in-situ measurement method and device for stratum thermophysical parameters, a terminal and a storage medium, and belongs to the technical field of full-well-section stratum thermal parameter measurement, and the measurement method comprises the following steps: starting a drilling machine lifting device, lowering a side wall coring instrument to a to-be-measured stratum depth, and drilling a to-be-measured rock core by using the side wall coring instrument; starting the thermal parameter measuring device, heating the resistance wire at constant power, and measuring the resistance change value of the resistance wire caused by the temperature change of the to-be-measured core; according to the basic physical parameters of the resistance wire, the relation between the temperature change and the resistance change and the mathematical relation between the thermophysical parameters, the thermophysical parameters of the rock core of each test point and the stratum temperature gradient of the whole well section are calculated. The in-situ measurement method and device for the stratum thermophysical parameters, the terminal and the storage medium have the technical effects that the stratum thermophysical parameters can be measured, the stratum temperature gradient of the whole well section can be calculated, the ground temperature gradient can be rapidly obtained, and the geothermal resource quantity can be accurately evaluated.

Description

Technical Field

[0001] This invention belongs to the field of formation thermal parameter measurement technology for the entire well section, and more specifically, it relates to an in-situ measurement method, device, terminal and storage medium for formation thermal physical parameters. Background Technology

[0002] Geothermal energy is an important clean and renewable energy source, and its development depends on the precise evaluation of underground thermal reservoir resources. Thermophysical parameters of underground rocks (such as thermal conductivity, thermal diffusivity, and specific heat capacity) are core fundamental parameters for geothermal resource evaluation. Currently, the traditional method for obtaining these parameters mainly relies on laboratory measurements of drill cores. However, this method has significant limitations: drilling cores is time-consuming and costly, and continuous sampling throughout the well cannot be achieved; furthermore, laboratory tests are usually conducted under normal temperature, pressure, and dry conditions, which differ significantly from the high temperature, high pressure, and fluid conditions underground. The parameters obtained from laboratory tests are difficult to represent the in-situ state of the rock, thus requiring complex simulation and correction processes to approximate the true values, but this also increases errors and uncertainties. In recent years, although some wellbore thermophysical property testing equipment has emerged, thermophysical property testing conducted at the wellbore is easily affected by drilling fluid, leading to problems such as large errors, insufficient stability, and low reliability in the test results. In summary, there is an urgent need to overcome the limitations of existing technologies and develop in-situ testing devices and methods for rapid, low-cost, and accurate full-well section thermophysical parameters to solve many problems in existing technologies, achieve rapid acquisition of geothermal gradients, and accurately evaluate geothermal resources. Summary of the Invention

[0003] The purpose of this invention is to provide an in-situ method, device, terminal, and storage medium for measuring formation thermal properties, aiming to solve the technical problem in the prior art of rapidly obtaining formation temperature gradients and accurately evaluating geothermal resources.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: to provide an in-situ method for determining formation thermal property parameters, comprising the following steps: Start the drilling rig hoisting device, lower the wellbore coring instrument to the depth of the formation to be measured, pop out the support device, so that the support device supports the wellbore coring instrument and makes it stably stay in the formation to be measured, and use the wellbore coring instrument to drill the rock core to be measured. The thermal parameter measuring device is activated, and the resistance wire is heated with constant power to measure the change in resistance of the resistance wire caused by the temperature change of the core sample. Based on the basic physical parameters of the resistance wire, the relationship between temperature change and resistance change, and the mathematical relationship between various thermophysical parameters, the core thermophysical parameters at each test point are calculated. The formation temperature gradient throughout the well section is calculated based on the core thermophysical parameters at each test point.

[0005] In one possible implementation, the drilling rig hoisting device is located at the upper end of the wellbore and has a movable end that moves inside the wellbore along the wellbore extension direction. The wellbore coring instrument is connected to the movable end and has a degree of freedom of rotation between the wellbore extension direction and perpendicular to the wellbore extension direction. When the wellbore coring instrument moves along the wellbore extension direction, it is parallel to the wellbore extension direction; when the wellbore coring instrument drills cores, it is perpendicular to the wellbore extension direction. The support device is connected to the movable end and is used to abut against the wellbore wall when the wellbore coring instrument drills cores, so as to stably support the wellbore coring instrument.

[0006] In one possible implementation, the wellbore coring device includes: The rotating device has one end connected to the moving end and the other end having a degree of freedom to rotate between the wellbore extension direction and perpendicular to the wellbore extension direction. A core sampler is connected to the other end of the rotating device. The core sampler has rotational freedom between the wellbore extension direction and the direction perpendicular to the wellbore extension direction by means of the rotating device. The core sampler is used to drill cores towards the well wall.

[0007] In one possible implementation, the support device includes: The pressure assembly, connected to the mobile end, has one end having a degree of freedom to extend and push along the wellbore extension direction; A spring, one end of which is connected to the telescopic end of the pressure assembly, has a degree of freedom to extend and retract along the wellbore extension direction; The push shaft is connected at one end to the other end of the spring, and the push shaft has a degree of freedom to move along the extension direction of the wellbore; The support arm has one end hinged to the moving end, and the other end of the push shaft is hinged to the middle of the support arm. The support arm has a degree of freedom to swing in the vertical plane by means of the push shaft. When the wellbore coring instrument drills rock cores, the other end of the support arm is used to abut against the wellbore wall to stably support the wellbore coring instrument.

[0008] In one possible implementation, the core-collecting tube includes: The outer shell is internally divided into a first accommodating cavity and a second accommodating cavity by a partition. The second accommodating cavity is located at the center of the inner wall of the outer shell. The first accommodating cavity is located between the inner wall of the outer shell and the second accommodating cavity, forming an enclosure around the second accommodating cavity. The second accommodating cavity is used to accommodate the drilled core. The thermal parameter measuring device is located inside the first accommodating cavity. An opening is provided on the partition near the thermal parameter measuring device. The thermal parameter measuring device is used to measure the temperature of the core located inside the second accommodating cavity through the opening and to measure the change in resistance of the resistance wire caused by the temperature change. The side of the outer shell has a mud outlet communicating with the second accommodating cavity. The mud outlet is used to discharge the mud and rock cuttings generated during core drilling. A drill bit is connected to the outer casing and located away from the rotating device. The drill bit is used to drill core samples toward the well wall. The drill bit has an internal cavity that communicates with the second accommodating cavity. The drilled core samples enter the second accommodating cavity through the cavity. A drive assembly is connected to the housing at one end near the rotating device and to the rotating device. The drive assembly is used to drive the housing to rotate circumferentially so that the drill bit can drill for core samples.

[0009] In one possible implementation, the thermal parameter measuring device includes: An insulating block is disposed within the first accommodating cavity and abuts against the inner wall of the outer shell; A thermophysical property measuring component is disposed inside the first accommodating cavity and attached to the insulating block. The thermophysical property measuring component includes a resistance wire for measuring the core temperature obtained by drilling through the opening and measuring the change in resistance of the resistance wire caused by temperature changes. The thermophysical property measuring component is electrically connected to a terminal located on the ground.

[0010] In one possible implementation, the thermophysical property measuring component further includes: The housing is disposed against the insulating block, and has an opening near the opening position; An insulator, connected to the interior of the housing; An insulating mandrel is located inside the housing and one end is connected to the insulator; The resistance wire is spirally wound around the outer wall of the insulating mandrel. The resistance wire is used to measure the core temperature obtained by drilling through the opening and the aperture and to measure the change in resistance of the resistance wire caused by the temperature change. The resistance wire is electrically connected to the conductor, which passes through the insulator, the shell and the outer shell in sequence and is electrically connected to the terminal.

[0011] The beneficial effects of the in-situ determination method for formation thermal properties provided by this invention are as follows: Compared with the prior art, this invention lowers the wellbore coring instrument to the depth of the formation to be measured, pops out the support device, and uses the support device to support the wellbore coring instrument and keep it stably stationary in the formation to be measured. The wellbore coring instrument is then used to drill the core sample. The thermal parameter measuring device is activated to measure the change in resistance of the resistance wire caused by the temperature change of the core sample. Based on the basic physical parameters of the resistance wire, the relationship between temperature change and resistance change, and the mathematical relationships between various thermal properties, the core thermal properties at each test point are calculated. Based on the core thermal properties at each test point, the formation temperature gradient of the entire well section is calculated. This invention has the technical effect of being able to measure formation thermal properties, calculate the formation temperature gradient of the entire well section, achieve rapid acquisition of geothermal gradient, and accurately evaluate geothermal resources.

[0012] The present invention also provides an in-situ measurement device for formation thermal properties parameters, comprising: The acquisition module is used to start the drilling rig lifting device, lower the wellbore coring instrument to the depth of the formation to be measured, pop out the support device to support the wellbore coring instrument and make it stably stay in the formation to be measured, and use the wellbore coring instrument to drill the rock core to be measured. The measurement module is used to start the thermal parameter measurement device, heat the resistance wire with constant power, and measure the change in resistance of the resistance wire caused by the temperature change of the core sample. The calculation module is used to calculate the core thermophysical parameters at each test point based on the basic physical parameters of the resistance wire, the relationship between temperature change and resistance change, and the mathematical relationship between various thermophysical parameters. The determination module is used to calculate the formation temperature gradient throughout the well section based on the core thermophysical parameters of each test point.

[0013] The beneficial effects of the in-situ determination device for formation thermal properties provided by this invention are as follows: Compared with the prior art, this invention uses an acquisition module to reach the depth of the formation to be tested and drills a core sample. The measurement module measures the change in resistance of the resistance wire caused by the temperature change of the core sample. The calculation module calculates the core thermal properties at each test point based on the basic physical parameters of the resistance wire, the relationship between temperature and resistance changes, and the mathematical relationships between various thermal properties. The determination module calculates the formation temperature gradient across the entire well section based on the core thermal properties at each test point. This allows for the determination of formation thermal properties and the calculation of the formation temperature gradient across the entire well section, enabling rapid acquisition of the geothermal gradient and accurate evaluation of geothermal resources.

[0014] The present invention also provides a terminal, comprising: Memory, used to store one or more computer programs; A processor, on which the computer program can run; Wherein, when one or more computer programs are executed by the processor, the one or more processors implement the in-situ determination method for formation thermal property parameters as described above.

[0015] The beneficial effects of the terminal provided by this invention are as follows: Compared with the prior art, the terminal can use the in-situ measurement method of formation thermal property parameters to measure formation thermal property parameters, calculate the formation temperature gradient of the entire well section, realize the rapid acquisition of geothermal gradient, and accurately evaluate the amount of geothermal resources.

[0016] The present invention also provides a storage medium containing computer-executable instructions, which, when executed by a computer processor, are used to perform the in-situ measurement method of formation thermophysical parameters as described above.

[0017] The beneficial effects of the storage medium provided by the present invention are as follows: compared with the prior art, the storage medium can perform in-situ measurement methods of formation thermal property parameters, measure formation thermal property parameters, calculate the formation temperature gradient of the whole well section, realize rapid acquisition of geothermal gradient, and accurately evaluate geothermal resources. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A flowchart illustrating the in-situ measurement method for formation thermal properties parameters provided in this embodiment of the invention; Figure 2 A schematic diagram of the structure of the in-situ measurement device for formation thermal properties provided in an embodiment of the present invention; Figure 3 A schematic diagram of the acquisition module and the measurement module of the in-situ measurement device for formation thermophysical parameters provided in an embodiment of the present invention; Figure 4 for Figure 3 Enlarged view of the central structure; Figure 5 for Figure 3 and Figure 4 A first-view structural diagram of the core extraction tube in the image; Figure 6 for Figure 3 and Figure 4 A schematic diagram of the core-taking tube from a second-view perspective; Figure 7 This is a schematic diagram of the terminal structure provided in an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures: 10. Drilling rig hoisting device; 11. Moving end; 20. Borehole coring device; 21. Rotating device; 211. Pressing assembly; 212. First rotating arm; 213. Second rotating arm; 214. Casing; 22. Coring tube; 221. Housing; 222. Drill bit; 223. Drive assembly; 224. First accommodating cavity; 225. Second accommodating cavity; 226. Mud discharge outlet; 30. Support device; 31. Pressure assembly; 32. Spring; 33. Push shaft; 34. Support arm; 40. Thermal parameter measuring device; 41. Resistance wire; 42. Insulating block; 43. Thermophysical property measuring assembly; 431. Housing; 432. Insulator; 433. Insulating mandrel; 434. Wire; 50. Acquisition module; 60. Measurement module; 70. Calculation module; 80. Determination module; 90. Memory; 91. Computer program; 100. Processor. Detailed Implementation

[0021] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0022] The existing wellbore thermal property testing equipment will encounter the following problems in the actual geothermal exploration thermal property parameter measurement process: (1) Most formation thermal property parameter measurements are carried out in the laboratory after drilling core samples, which changes the original environment of formation temperature, pressure and fluid, and cannot achieve in-situ measurement, which affects the reliability of parameters and is time-consuming; (2) Existing in-situ measurement of thermal property parameters cannot avoid the interference of drilling fluid, mud, mud cake, etc., resulting in poor measurement repeatability and low accuracy; (3) It is not possible to continuously measure the thermal property parameters of formations at different depths throughout the well section, and it is not possible to obtain the geothermal gradient of the entire well section; (4) It is not possible to quickly measure the formation thermal property parameters while obtaining formation cores; (5) Existing technology is costly and economically inefficient when measuring in the laboratory or in the field.

[0023] Therefore, in order to address the problems of traditional formation thermal property parameter determination methods, such as the inability to quickly, cost-effectively, and accurately measure formation thermal parameters at different depths and obtain geothermal gradients throughout the well section, the present invention provides an in-situ determination method, device, terminal, and storage medium for formation thermal property parameters. This invention can solve the above problems, meet the requirements of rapid and accurate formation temperature measurement, and continuously obtain multiple thermal parameters such as thermal conductivity, specific heat capacity, and thermal diffusivity throughout the well section. The instrument is inexpensive, providing convenient assistance and application for the accurate evaluation of geothermal resources.

[0024] Please see Figure 1-6The in-situ measurement method for formation thermal properties provided by this invention includes the following steps: S110: Start the drilling rig hoisting device 10, lower the wellbore coring instrument 20 to the depth of the formation to be measured, pop out the support device 30, so that the support device 30 supports the wellbore coring instrument 20 and keeps it stably in the formation to be measured, and use the wellbore coring instrument 20 to drill the rock core to be measured. S120: Start the thermal parameter measuring device 40, heat the resistance wire 41 with constant power, and measure the resistance change value of the resistance wire 41 caused by the temperature change of the core to be tested. S130: Based on the basic physical parameters of resistance wire 41, the relationship between temperature change and resistance change, and the mathematical relationship between various thermophysical parameters, calculate the core thermophysical parameters at each test point; S140: Calculate the formation temperature gradient throughout the well section based on the core thermophysical parameters of each test point.

[0025] The in-situ determination method for formation thermal properties provided by this invention, compared with the prior art, uses the drilling rig lifting device 10 to place the core sampler 20 at different depths within the well section, achieving continuous sampling throughout the entire well section. The thermal parameter determination device 40 is then activated to measure the extracted core samples. By using the basic physical parameters of the resistance wire 41, the relationship between temperature change and resistance change, and the mathematical relationships between various thermal properties, the thermal properties of the core samples at each test point are calculated. Finally, based on the thermal properties of the core samples at each test point, the formation temperature gradient of the entire well section is calculated. This solves the technical problem in the prior art of making it difficult to quickly obtain the formation temperature gradient and accurately evaluate the amount of geothermal resources. It has the technical effect of being able to calculate the formation temperature gradient of the entire well section, achieve rapid acquisition of the geothermal gradient, and accurately evaluate the amount of geothermal resources.

[0026] In this embodiment, the drilling rig hoisting device 10 is started, the wellbore coring instrument 20 is lowered to the depth of the formation to be measured, the support device 30 is ejected, the support device 30 supports the wellbore coring instrument 20 and keeps it stably in the formation to be measured, and the specific operation steps for drilling the core to be measured using the wellbore coring instrument 20 are as follows: (1) Start the drilling rig hoisting device 10 and slowly lower the wellbore coring instrument 20 into the well (inside the wellbore). When the wellbore coring instrument 20 approaches the deepest target layer, reduce the lowering speed to ensure safe arrival at the predetermined depth. (2) After reaching the target layer, eject the support device 30 outward to support the wellbore coring instrument 20 and keep it stably in the formation to be measured. (3) Start the wellbore coring instrument 20, rotate the core tube 22 of the wellbore coring instrument 20 by 90°, and continuously rotate it to drill into the well wall, maintaining appropriate pressure to ensure that the core enters the core tube 22.

[0027] In this embodiment, the specific steps for activating the thermal parameter measuring device 40 to heat the resistance wire 41 with constant power and measuring the change in resistance of the resistance wire 41 caused by the temperature change of the core sample are as follows: After the wellbore coring instrument 20 stops drilling, the wellbore coring instrument 20 is positioned at the target formation. The thermal parameter measuring device 40 is then activated and operated at a stable power. As drilling concludes, the core temperature inside the coring cylinder 22 continuously decreases over time, and the resistance value of the resistance wire 41... The resistance of the platinum resistance wire 41 was continuously decreased, and the change in resistance was measured.

[0028] Existing techniques include using nickel-chromium alloy resistance wire 41 (Cr20Ni80) to wind rock samples, heating them to 800°C in a controlled-temperature chamber, and measuring the change in the rock's thermal conductivity with temperature to determine its thermophysical properties. The resistivity of most rocks ranges from 10... 2 Up to 10 5 The value is between Ω·m, but the specific value will be affected by factors such as mineral composition, porosity, and fluid.

[0029] Measuring the change in resistance of resistance wire 41 caused by temperature changes in the core sample refers to using resistance wire 41 as a temperature sensor to monitor temperature changes in the rock. The core principle is the thermo-resistance characteristic of resistance wire 41; its resistance changes with temperature (positive temperature coefficient material: temperature rise leads to resistance rise). By measuring the change in resistance of resistance wire 41... ), from which its own temperature change can be deduced ( The formula is:

[0030] in, This is the initial resistance value. It is the temperature coefficient of resistance (e.g., about 0.4% / ℃ for nichrome wire). This represents the change in temperature.

[0031] In this embodiment, the specific steps for calculating the core thermophysical parameters at each test point based on the basic physical parameters of the resistance wire 41, the relationship between temperature change and resistance change, and the mathematical relationships between various thermophysical parameters are as follows: After the resistance change signal of the resistance wire 41 is transmitted to the processor (the terminal includes a processor for processing the resistance change signal), the processor calculates the core thermophysical parameters at each test point based on the basic physical parameters of the resistance wire 41, the relationship between temperature change and resistance change, and the mathematical relationships between various thermophysical parameters, including: Using the resistance value of resistance wire 41 With temperature Relationship:

[0032] The temperature change was calculated. ,in Reference temperature The resistance below, The temperature coefficient of resistance of resistance wire 41. ≈0.00385K -1 ; Utilizing the resistance wire temperature rise of 41 With time Relationship:

[0033] pass and The slope yields the conductivity coefficient. ,in Heating power per unit length denoted as the thermal diffusivity of the formation to be measured, r is the radius of the resistance wire 41 (25 μm), and C≈1.781; The characteristic time of the transient temperature rise curve :

[0034] The thermal diffusivity was calculated. ; Using specific heat capacity and thermal diffusivity Thermal conductivity The relationship between them:

[0035] Specific heat capacity was calculated .

[0036] In this embodiment, calculating the formation temperature gradient of the entire well section based on the core thermophysical parameters of each test point refers to calculating the formation temperature gradient of the entire well section based on the core thermophysical parameters using existing technologies.

[0037] In some embodiments, please refer to Figures 3-6The drilling rig lifting device 10 is located at the upper end of the wellbore and has a movable end 11 that moves along the wellbore's extension direction inside the wellbore. A core sampler 20 is connected to the movable end 11 and has a degree of freedom to rotate between the wellbore's extension direction and a direction perpendicular to the wellbore's extension direction. When the core sampler 20 moves along the wellbore's extension direction, it is parallel to the wellbore's extension direction; when the core sampler 20 drills a core, it is perpendicular to the wellbore's extension direction. A support device 30 is connected to the movable end 11 and is used to abut against the well wall when the core sampler 20 drills a core, thus providing stable support for the core sampler 20. The drilling rig lifting device 10 in this embodiment can employ existing technology and can perform actions such as lifting and lowering drilling tools, thereby facilitating drilling operations. The drilling rig hoisting device 10 is mounted on the upper end of the wellbore. In this embodiment, the wellbore is vertical, forming a vertical shaft. The movable end 11 of the drilling rig hoisting device 10 can be a drilling tool or drill rod, which can be controlled to move up and down within the wellbore. By controlling the movable end 11 to be placed at different heights (wellbore depths), core samples can be drilled at different positions or depths within the wellbore. The wellbore coring instrument 20 can rotate 90°. When not in operation, it is set vertically, facilitating up and down movement within the wellbore. When the wellbore coring instrument 20 is in operation, it is set horizontally, meaning the wellbore coring instrument 20 can rotate between vertical and horizontal states. Figures 3-6 The wellbore coring instrument 20 is in the working state, that is, in a horizontal state, which is used to drill cores into the wellbore. By moving the movable end 11 up and down inside the wellbore, the height of the wellbore coring instrument 20 can be adjusted, so that cores can be taken from different positions.

[0038] In some embodiments, please refer to Figures 3-6 The wellbore coring apparatus 20 includes a rotating device 21 and a core cylinder 22. One end of the rotating device 21 is connected to the movable end 11, and the other end has a degree of freedom to rotate between the wellbore extension direction and perpendicular to the wellbore extension direction. The core cylinder 22 is connected to the other end of the rotating device 21 and has a degree of freedom to rotate between the wellbore extension direction and perpendicular to the wellbore extension direction by means of the rotating device 21. The core cylinder 22 is used to face the wellbore and drill cores. In this embodiment, the rotating device 21 can drive the core cylinder 22 to rotate between a vertical state and a horizontal state, thereby facilitating the drilling of cores from the wellbore. When operation is required, the rotating device 21 is used to drive the core cylinder 22 to rotate. When operation is not required, the rotating device 21 is used to drive the core cylinder 22 to be set in a vertical position, that is, the axis of the core cylinder 22 is along the vertical direction.

[0039] Specifically, the rotating device 21 includes a pressing component 211, a first rotating arm 212, a second rotating arm 213, and a casing 214. The pressing component 211 is connected to the moving end 11. The casing 214 is arranged vertically along the height direction of the wellbore. The first rotating arm 212 is placed inside the casing 214, and its lower end is hinged to the middle of the core sampler 22. One end of the second rotating arm 213 is connected to the pressing component 211, and the other end is hinged to one end of the core sampler 22. The first rotating arm 212 has the freedom to move along the axial direction of the casing 214 within the casing 214. By controlling the movement of the first rotating arm 212, the lower end of the first rotating arm 212 pushes the core sampler 22 to rotate, and the core sampler 22 rotates around the hinge end with the second rotating arm 213, that is, the core sampler 22 can rotate 90 degrees, that is, rotate between the vertical and horizontal states.

[0040] In some embodiments, please refer to Figures 3-6 The support device 30 includes a pressure component 31, a spring 32, a push shaft 33, and a support arm 34. The pressure component 31 is connected to the movable end 11, and one end has a degree of freedom to extend and retract along the wellbore extension direction. One end of the spring 32 is connected to the telescopic end of the pressure component 31, and it has a degree of freedom to extend and retract along the wellbore extension direction. One end of the push shaft 33 is connected to the other end of the spring 32, and the push shaft 33 has a degree of freedom to move along the wellbore extension direction. One end of the support arm 34 is hinged to the movable end 11, and the other end of the push shaft 33 is hinged to the middle of the support arm 34. The support arm 34 has a degree of freedom to swing in the vertical plane with the help of the push shaft 33. When the wellbore coring instrument 20 drills cores, the other end of the support arm 34 is used to abut against the wellbore wall to stably support the wellbore coring instrument 20. In this embodiment, the pressure component 31 can extend and retract along the wellbore extension direction, thereby pushing the spring 32 to extend and retract. After the spring 32 extends and retracts, its own elastic force can push the pushing shaft 33 to move, thereby pushing the support arm 34 to swing or rotate. Ultimately, the lower end (or swing end) of the support arm 34 can abut against the well wall, thus providing a reaction force to the well wall coring instrument 20, i.e., resisting the well wall coring instrument 20 from moving in the opposite direction, which is beneficial for the drilling core operation of the well wall coring instrument 20. When drilling is completed, the pressure component 31 retracts upward, and the lower end of the support arm 34 moves closer to the middle of the wellbore and away from the well wall, thus not constraining the well wall coring instrument 20, which can move up and down along the inside of the wellbore.

[0041] The aforementioned pop-out support device 30 refers to popping out (rotating) the support arm 34 and causing the lower end of the support arm 34 to abut against the well wall.

[0042] In this embodiment, the pressure component 31 is a pusher in the prior art, such as an electric pusher, which pushes and extends in a straight line. The spring 32 acts as a buffer to prevent hard contact between the lower end of the support arm 34 and the well wall, thus avoiding damage to the support arm 34. The pusher shaft 33 can be regarded as a connecting rod. When it moves vertically, it can push the support arm 34 to rotate around its upper end, thereby allowing the lower end of the support arm 34 to abut against the well wall, so that the well wall coring instrument 20 can stably drill into the well wall.

[0043] In this embodiment, a sleeve-like mechanism is provided on the outside of the spring 32. When the spring 32 elastically expands, contracts, or deforms within this sleeve, it will not cause the push shaft 33 to deform or move in other directions; that is, the push shaft 33 can only move vertically. In this embodiment, the support arm 34 has a larger upper width and a smaller lower width, and can be knife-shaped. Its lower end will not slide after contacting the well wall, providing stable support for the well wall coring instrument 20.

[0044] In some embodiments, please refer to Figures 3-6The core sampler 22 includes a shell 221, a drill bit 222, and a drive assembly 223. The shell 221 is internally divided into a first accommodating cavity 224 and a second accommodating cavity 225 by a partition. The second accommodating cavity 225 is located at the center of the shell 221. The first accommodating cavity 224 is located between the inner wall of the shell 221 and the second accommodating cavity 225, forming an enclosure around the second accommodating cavity 225. The second accommodating cavity 225 is used to accommodate the drilled core. A thermal parameter measuring device 40 is disposed inside the first accommodating cavity 224. An opening is provided on the partition near the thermal parameter measuring device 40. The thermal parameter measuring device 40 is used to measure the temperature of the core located inside the second accommodating cavity 225 through the opening and to measure the change in resistance of the resistance wire 41 caused by temperature changes. The shell 221 has a mud outlet 226 on its side that connects to the second accommodating cavity 225. The mud outlet 226 is used to discharge the mud and cuttings generated during core drilling. The drill bit 222 is connected to the shell 221 at the end away from the rotating device 21. The drill bit 222 is used to drill cores toward the well wall. The drill bit 222 has a cavity inside that connects to the second accommodating cavity 225. The drilled cores enter the second accommodating cavity 225 through the cavity. The drive assembly 223 is connected to the end of the shell 221 near the rotating device 21 and is connected to the rotating device 21. The drive assembly 223 is used to drive the shell 221 to rotate circumferentially. The moving end 11 is moved in the wellbore to move it toward the well wall so that the drill bit 222 can drill cores. At the same time, the support arm 34 abuts against the well wall. In this embodiment, the outer shell 221 is made of alloy steel, which is hard and not easily deformed. During core drilling, the drill bit 222 is in close contact with the well wall. The drive assembly 223 drives the outer shell 221 and the drill bit 222 to rotate, so that the drill bit 222 can gradually drill into the interior of the well wall until the core is removed. The core can then gradually enter the second accommodating cavity 225, thus realizing the core drilling. Mud and rock cuttings generated during the drilling process are discharged through the mud discharge port 226. The thermal parameter measuring device 40, as a temperature sensor, contacts the outer wall of the core through an opening, thereby monitoring the temperature of the core and measuring the change in resistance of the resistance wire 41 caused by temperature changes. This measurement is performed or calculated through an external terminal (existing technology).

[0045] Specifically, the thermal parameter measuring device 40 is positioned close to the opening. When the core is placed inside the second accommodating cavity 225, it can contact the outer wall of the core, thereby monitoring or measuring the temperature of the core. When the core tube 22 is removed from inside the well wall, the core will remain inside the well wall and will not break inside the core tube 22.

[0046] In this embodiment, the drill bit 222 is made of alloy steel, and its surface consists of multiple alloy teeth, such as... Figure 5-6As shown, the drill bit 222 has a hollow cavity inside, surrounding the outer right wall and front end of the core barrel 22, allowing the core to enter. In this embodiment, the drive assembly 223 consists of a drive motor, a central gear, planetary gears, and an external gear. The drive motor is connected to one end of the rotating device 21 to generate rotational torque or driving force. The central gear is connected to the power output end of the drive motor and can rotate circumferentially with the help of the drive motor. There are three planetary gears, all arranged around the central gear, meshing and transmitting power between them. The external gear surrounds the three planetary gears and meshes with them. One end of the external gear is fixedly connected to one end of the core barrel 22. After the central gear rotates, it drives the three planetary gears to rotate, and the three planetary gears simultaneously drive the external gear to rotate. Thus, the external gear and the core barrel 22 rotate circumferentially simultaneously, allowing the drill bit 222 to gradually drill into the well wall, achieving the effect of core extraction. The central gear, planetary gears, and external gear can be considered as a planetary gear train structure in the prior art.

[0047] Specifically, the second accommodating cavity 225 is cylindrical and its diameter is the same as that of the drill bit 222, while the annular column located outside the second accommodating cavity 225 is the first accommodating cavity 224.

[0048] In some embodiments, please refer to Figures 3-6 The thermal parameter measuring device 40 includes an insulating block 42 and a thermal property measuring component 43. The insulating block 42 is disposed within the first accommodating cavity 224 and abuts against the inner wall of the outer shell 221. The thermal property measuring component 43 is disposed inside the first accommodating cavity 224 and abuts against the insulating block 42. The thermal property measuring component 43 includes a resistance wire 41, used to measure the core temperature obtained by drilling through an opening and to measure the change in resistance of the resistance wire 41 caused by temperature changes. The thermal property measuring component 43 is electrically connected to a terminal located on the ground. Since the core tube 22 is cylindrical, there are multiple insulating blocks 42, each arc-shaped. The multiple insulating blocks 42 inside the core tube 22 can form a circular cylindrical structure, which can play an insulating role and prevent the heat of the resistance wire 41 from dissipating. In this embodiment, an insulating block 42 is provided at least at the location where the thermophysical property measuring component 43 is provided. The insulating block 42 is a tough insulating material, such as vulcanized rubber, which is in close contact with the inner wall of the core tube 22 and the thermophysical property measuring component 43 and will not move.

[0049] The thermophysical property measuring component 43 can pass through the opening to contact the core and monitor the core temperature.

[0050] In some embodiments, please refer to Figures 3-6The thermophysical property measuring component 43 also includes a housing 431, an insulator 432, and an insulating mandrel 433. The housing 431 is disposed against the insulating block 42 and has an opening near the opening position. The insulator 432 is connected inside the housing 431. The insulating mandrel 433 is located inside the housing 431 and one end is connected to the insulator 432. A resistance wire 41 is spirally wound around the outer wall of the insulating mandrel 433. The resistance wire 41 is used to measure the core temperature obtained through the opening and the opening, and to measure the change in resistance of the resistance wire 41 caused by temperature changes. The resistance wire 41 is electrically connected to a conductor 434, which passes through the insulator 432, the housing 431, and the outer shell 221 in sequence and is electrically connected to a terminal. The housing 431 provides protection and is made of stainless steel. The resistance wire 41 is a platinum resistance wire, which can be used as both a heating device and a resistance-temperature sensor. The front end of the thermophysical property measuring component 43 faces the core barrel 22 and the drill bit 222. The rear end of the resistance wire 41 is connected to the conductor 434, which is located outside the core-taking cylinder 22 and inside the sleeve 214. After selecting the core, a portion of the outer wall of the core is allowed to enter the opening and the interior of the cavity, thus allowing it to contact the resistance wire 41. In special circumstances, when the outer diameter of the core is the same as the inner diameter of the second accommodating cavity 225, the core cannot enter the opening and the interior of the cavity. In this case, the resistance wire 41 may not be in contact with the core. Even without contact, the temperature of the core can still be measured using the resistance wire 41 without affecting the temperature measurement results.

[0051] This invention also provides an in-situ measurement device for formation thermal properties, comprising an acquisition module 50, a measurement module 60, a calculation module 70, and a determination module 80. The acquisition module 50 is used to start the drilling rig lifting device 10, lower the wellbore coring instrument 20 to the depth of the formation to be measured, and pop out the support device 30 to support the wellbore coring instrument 20 and keep it stably stationary in the formation to be measured, and use the wellbore coring instrument 20 to drill the core to be measured. The measurement module 60 is used to start the thermal parameter measurement device 40, heat the resistance wire 41 with constant power, and measure the resistance change value of the resistance wire 41 caused by the temperature change of the core to be measured. The calculation module 70 is used to calculate the core thermal properties of each test point based on the basic physical parameters of the resistance wire 41, the relationship between temperature change and resistance change, and the mathematical relationship between various thermal properties. The determination module 80 is used to calculate the formation temperature gradient of the entire well section based on the core thermal properties of each test point.

[0052] The in-situ formation thermal property parameter measurement device provided by this invention, compared with the prior art, achieves continuous sampling throughout the well section by activating the drilling rig lifting device 10 through the acquisition module 50, placing the core sampler 20 at different heights within the well section; by activating the thermal parameter measurement device 40 through the measurement module 60, the temperature of the extracted core is measured, thereby measuring the resistance change value of the resistance wire 41; by calculating the core thermal property parameters at each test point through the calculation module 70, based on the basic physical parameters of the resistance wire 41, the relationship between temperature change and resistance change, and the mathematical relationship between various thermal property parameters; and by calculating the formation temperature gradient throughout the well section through the determination module 80, based on the core thermal property parameters at each test point, the formation temperature gradient of the entire well section can be calculated, enabling rapid acquisition of the geothermal gradient and accurate evaluation of geothermal resources.

[0053] In this embodiment, the acquisition module 50 includes a drilling rig lifting device 10, a wellbore coring instrument 20, and a support device 30. The wellbore coring instrument 20 includes a rotating device 21 and a coring cylinder 22. The support device 30 includes a pressure component 31, a spring 32, a push shaft 33, and a support arm 34. The measurement module 60 includes a thermal parameter measurement device 40, which includes an insulating block 42 and a thermophysical property measurement component 43. The drilling rig lifting device 10, the wellbore coring instrument 20, the support device 30, the insulating block 42, and the thermophysical property measurement component 43 all adopt the drilling rig lifting device 10, the wellbore coring instrument 20, the support device 30, the insulating block 42, and the thermophysical property measurement component 43 as described in the above-mentioned in-situ measurement method of formation thermophysical parameters, which will not be described again here. Both the calculation module 70 and the determination module 80 adopt the calculation method in the in-situ determination method of formation thermal property parameters as described above. The determination module 80 can be the existing technology, which can organize the core thermal property parameters of each test point calculated by the calculation module 70, and finally obtain the formation temperature gradient of the whole well section.

[0054] The present invention also provides a terminal, including a memory 90 and a processor 100, wherein the memory 90 is used to store one or more computer programs 91; the computer programs 91 can run on the processor 100; wherein, when one or more computer programs 91 are executed by the processor 100, the one or more processors 100 implement the in-situ measurement method of formation thermal property parameters as described above.

[0055] In this embodiment, Figure 7 Taking a processor 100 as an example, the memory 90 can be connected to the processor 100 via a bus or other means. The memory 90, as a computer-readable storage medium, can be used to store software programs, computer-executable programs, and modules. The processor 100 executes various terminal functions and data processing by running the computer program 91, instructions, and modules stored in the memory 90, thereby realizing the above-mentioned in-situ measurement method of formation thermophysical parameters.

[0056] The memory 90 may primarily include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on terminal usage. Furthermore, the memory 90 may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 90 may further include remotely located memories 90 relative to the processor 100, which can be connected to the terminal via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0057] In this embodiment, the terminal can be a server, such as a mobile phone, MCU, ECU, industrial control computer, etc., which is not limited here; the server can be a physical server, cloud server, etc., which is not limited here.

[0058] The present invention also provides a storage medium containing computer-executable instructions, which, when executed by a computer processor 100, are used to perform the in-situ measurement method of formation thermophysical parameters as described above.

[0059] Of course, the computer-executable instructions provided in the embodiments of the present invention are not limited to the above-described method operations, but can also perform related operations in the in-situ measurement method of formation thermal property parameters provided in any embodiment of the present invention.

[0060] Based on the above description of the implementation methods, those skilled in the art can clearly understand that the present invention can be implemented using software and necessary general-purpose hardware, and of course, it can also be implemented using hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk, or optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of the various embodiments of the present invention.

[0061] It is worth noting that in the embodiments of the above-mentioned in-situ measurement device for formation thermal properties, the modules included are only divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be achieved; in addition, the specific names of each functional module are only for easy differentiation and are not used to limit the scope of protection of the present invention.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for in situ determination of a formation thermal property parameter, comprising: The method comprises the following steps: starting a drilling rig lifting device, lowering a sidewall coring instrument to a formation depth to be measured, ejecting a supporting device, making the supporting device support the sidewall coring instrument and stably stay in the formation to be measured, and drilling a core to be measured using the sidewall coring instrument; starting a thermal parameter measuring device, heating a resistance wire at a constant power, and measuring a resistance change value of the resistance wire caused by a temperature change of the core to be measured; calculating the thermal physical parameters of the core at each test point according to the basic physical parameters of the resistance wire, the relationship between the temperature change and the resistance change, and the mathematical relationship between the thermal physical parameters; calculating a formation temperature gradient of a whole well section according to the thermal physical parameters of the core at each test point.

2. A method for in situ determination of formation thermal properties according to claim 1, wherein, The drilling rig lifting device is arranged at an upper end of a wellbore and has a moving end moving along a wellbore extension direction inside the wellbore, the sidewall coring instrument is connected to the moving end and has a degree of freedom rotating between the wellbore extension direction and a direction perpendicular to the wellbore extension direction; the sidewall coring instrument moves along the wellbore extension direction in parallel to the wellbore extension direction, and drills a core in a direction perpendicular to the wellbore extension direction; the supporting device is connected to the moving end and is used for abutting against a sidewall to stably support the sidewall coring instrument when the sidewall coring instrument drills the core.

3. A method of in situ determining a formation thermal property parameter as claimed in claim 2, wherein, The sidewall coring instrument comprises: a rotating device connected to one end of the moving end and having a degree of freedom rotating between the wellbore extension direction and a direction perpendicular to the wellbore extension direction at the other end; a coring barrel connected to the other end of the rotating device, the coring barrel having a degree of freedom rotating between the wellbore extension direction and a direction perpendicular to the wellbore extension direction by means of the rotating device, and the coring barrel being used for drilling a core towards a sidewall.

4. The method of claim 2, wherein the method is performed in situ. The supporting device comprises: a pressure assembly connected to the moving end and having a degree of freedom extending and retracting in the wellbore extension direction at one end; a spring connected to a retraction end of the pressure assembly at one end and having a degree of freedom extending and retracting in the wellbore extension direction; a pushing shaft connected to the other end of the spring at one end, the pushing shaft having a degree of freedom moving in the wellbore extension direction; a supporting arm hinged to the moving end at one end and hinged to the other end of the pushing shaft at the middle part, the supporting arm having a degree of freedom swinging in a vertical plane by means of the pushing shaft, and the other end of the supporting arm being used for abutting against a sidewall to stably support the sidewall coring instrument when the sidewall coring instrument drills a core.

5. The method of claim 3, wherein the method is performed in situ. The coring barrel comprises: A housing is internally partitioned by a partition into a first accommodating cavity and a second accommodating cavity, the second accommodating cavity is located at the center of the housing, the first accommodating cavity is located between the inner wall of the housing and the second accommodating cavity and forms a surrounding of the second accommodating cavity, the second accommodating cavity is used for accommodating a drilled core, a thermal parameter measuring device is arranged in the first accommodating cavity, an opening is arranged on the partition close to the thermal parameter measuring device, the thermal parameter measuring device is used for measuring the temperature of the core in the second accommodating cavity through the opening and measuring the resistance change of the resistance wire caused by the temperature change; the side of the housing has a mud discharge port communicating with the second accommodating cavity, the mud discharge port is used for discharging the mud and cuttings generated when the core is drilled; A drill bit is connected to the housing and away from the rotating device, the drill bit is used for drilling the core towards the well wall, the drill bit is hollow and communicates with the second accommodating cavity, and the drilled core enters the second accommodating cavity through the cavity; A driving assembly is connected to the housing close to the rotating device and connected to the rotating device, the driving assembly is used for driving the circumferential rotation of the housing to make the drill bit drill the core.

6. A method of in situ determining a formation thermal property parameter as defined in claim 5, wherein, The thermal parameter measuring device comprises: An insulating block is arranged in the first accommodating cavity and abuts against the inner wall of the housing; A thermal property measuring assembly is arranged in the first accommodating cavity and abuts against the insulating block, the thermal property measuring assembly comprises a resistance wire, is used for measuring the temperature of the drilled core through the opening and measuring the resistance change of the resistance wire caused by the temperature change, and is electrically connected to a terminal, the terminal is located on the ground.

7. A method of in situ determining a formation thermal property parameter as defined in claim 6, wherein, The thermal property measuring assembly further comprises: A shell is arranged close to the opening and is arranged close to the opening; An insulator is connected to the inside of the shell; An insulating mandrel is located in the shell and connected to the insulator at one end; The resistance wire is spirally wound on the outer wall of the insulating mandrel, is used for measuring the temperature of the drilled core through the opening and measuring the resistance change of the resistance wire caused by the temperature change, is electrically connected to a wire, and the wire passes through the insulator, the shell and the housing in sequence and is electrically connected to the terminal.

8. An apparatus for in situ determination of a formation thermal property parameter, comprising: Comprise: An acquisition module is used for starting a drilling rig lifting device, lowering a well wall coring instrument to a to-be-measured stratum depth, popping out a supporting device to support the well wall coring instrument and make it stably stay in the to-be-measured stratum, and drilling a to-be-measured core by using the well wall coring instrument; A measuring module is used for starting a thermal parameter measuring device, heating a resistance wire at a constant power, and measuring the resistance change value of the resistance wire caused by the temperature change of the to-be-measured core; A calculation module is used for calculating the thermal property parameters of the core at each test point according to the basic physical parameters of the resistance wire, the relationship between the temperature change and the resistance change, and the mathematical relationship between each thermal property parameter; A determination module is used for calculating the stratum temperature gradient of the whole well section according to the thermal property parameters of the core at each test point.

9. A terminal, characterized by comprising: Comprise: A memory is used for storing one or more computer programs; a processor, the computer program being executable on the processor; wherein the one or more computer programs, when executed by the processor, enable the one or more processors to implement the method for in-situ determination of a formation thermal property parameter as claimed in any one of claims 1 to 7.

10. A storage medium containing computer-executable instructions, wherein: computer-executable instructions for performing the method for in-situ determination of a formation thermal property parameter as claimed in any one of claims 1 to 7 when executed by a computer processor.

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