Well wall coring device and method and storage medium

Abstract

The embodiment of the invention provides a side wall coring device and method and a storage medium. The device comprises a coring device and a controller. The corer is used for obtaining a rock core of a well wall; the controller is used for acquiring formation mechanical parameters of a well wall and adjusting working parameters of the corer according to the formation mechanical parameters; the formation mechanical parameters comprise the cutting force and the feeding force of a drill bit, and the working parameters of the corer are adjusted according to the formation mechanical parameters, specifically, the formation uniaxial compressive strength is determined according to the cutting force and the feeding force, and the drilling speed and the drilling pressure of the corer are adjusted according to the formation uniaxial compressive strength. The device greatly improves the coring efficiency of the drill bit.

Description

Technical Field

[0001] The invention relates to the field of petroleum engineering and well logging coring, and in particular to a device, method and storage medium for coring. Background Art

[0002] In petroleum engineering applications, mining safety assessment requires understanding of the strength characteristics of the formation under different confining pressures, which requires obtaining the core and wellbore formation mechanics parameters of the formation under confining pressure. Currently, coring drills are mainly suitable for relatively intact rock masses or harder rock masses. For more complex geology, it is impossible to perform in-situ testing of wellbore formation mechanics parameters during the logging process and wellbore coring. Summary of the invention

[0003] The purpose of the embodiments of the present invention is to provide a device, method and storage medium for coring a well wall, which greatly improves the coring efficiency of a drill bit.

[0004] In order to achieve the above-mentioned object, an embodiment of the present invention provides a device for coring a well wall, the device comprising: a coring device and a controller;

[0005] The corer is used to obtain the core of the well wall;

[0006] The controller is used to obtain the formation mechanics parameters of the well wall and adjust the working parameters of the corer according to the formation mechanics parameters;

[0007] The formation mechanical parameters include the cutting force and feed force of the drill bit, and adjusting the working parameters of the core drill according to the formation mechanical parameters includes: determining the uniaxial compressive strength of the formation according to the cutting force and feed force, and adjusting the drilling speed and drilling pressure of the core drill according to the uniaxial compressive strength of the formation.

[0008] Optionally, determining the uniaxial compressive strength of the formation according to the cutting force and the feed force includes:

[0009] Determining a contact friction angle of a cutting surface of a blade of a core remover according to the cutting force and the feed force;

[0010] Determining the internal friction angle of the formation according to the contact friction angle of the cutting surface of the blade;

[0011] Determining the cohesion force based on the contact friction angle of the cutting surface of the blade and the internal friction angle of the formation;

[0012] The uniaxial compressive strength of the formation is determined based on the internal friction angle and cohesion of the formation.

[0013] Optionally, determining the contact friction angle of the cutting surface of the blade of the core remover according to the cutting force and the feed force includes:

[0014] According to the difference of dominant force, it is divided into cutting stage and friction stage, and the contact friction angle of the cutting surface of the blade is determined according to the relationship between the cutting force and feed force in the two stages;

[0015] In the cutting stage, drilling is mainly cutting, and the cutting force F t and feed force F n The relationship is:

[0016]

[0017] In the friction stage, drilling is dominated by friction, and the relationship between cutting force and feed force is:

[0018]

[0019] Among them, π(R 2 -r 2 ) is the cross-sectional area of ​​the drill bit, θ is the contact friction angle of the cutting surface, is the internal friction angle of the formation, R is the outer diameter of the drill bit, r is the inner diameter of the drill bit, and P f is the lateral pressure of surrounding rock; c is the cohesion.

[0020] Optionally, determining the cohesion according to the contact friction angle of the cutting surface of the blade and the internal friction angle of the formation includes:

[0021]

[0022] Among them, c is the cohesion force, b is the intercept of the relationship curve between cutting force and feed force, is the internal friction angle of the formation, θ is the contact friction angle of the blade cutting surface, P f is the lateral pressure of the surrounding rock, R is the outer diameter of the drill bit, and r is the inner diameter of the drill bit.

[0023] Optionally, determining the uniaxial compressive strength of the formation according to the internal friction angle and cohesion of the formation includes:

[0024]

[0025] Among them, q c is the uniaxial compressive strength of the formation, c is the cohesion, is the internal friction angle of the formation.

[0026] Optionally, adjusting the drilling speed and drilling pressure of the core drill according to the uniaxial compressive strength of the formation includes:

[0027] If the uniaxial compressive strength of the formation is lower than a minimum threshold, the drilling speed is increased and the drilling pressure is decreased;

[0028] If the uniaxial compressive strength of the formation is higher than the maximum threshold, the drilling speed is reduced and the drilling pressure is increased.

[0029] Optionally, the corer includes a coring sub, a hydraulic sub, a power sub, a core storage device, a drill rod and a drill bit;

[0030] The coring sub is used to transfer the core to the core storage device;

[0031] The core storage device is used to store rock cores;

[0032] The hydraulic sub and the power sub are connected to the drill bit, and the hydraulic sub and the power sub are controlled by a controller to adjust the drilling pressure and drilling speed of the drill bit;

[0033] The drill rod is connected to the coring nipple, the hydraulic nipple, the power nipple and the core storage device.

[0034] On the other hand, the present invention also provides a method for coring a well wall, the method comprising: obtaining formation mechanical parameters to be measured in real time, and adjusting working parameters of a coring device according to the formation mechanical parameters, wherein the formation mechanical parameters include cutting force and feed force;

[0035] The adjusting the working parameters of the core drill according to the formation mechanical parameters includes: determining the uniaxial compressive strength of the formation according to the cutting force and the feed force, and adjusting the drilling speed and drilling pressure of the core drill according to the feedback of the uniaxial compressive strength of the formation.

[0036] Optionally, determining the uniaxial compressive strength of the formation according to the cutting force and the feed force includes:

[0037] Determining a contact friction angle of a cutting surface of a blade according to the cutting force and the feed force;

[0038] Determining the internal friction angle of the formation according to the contact friction angle of the cutting surface of the blade;

[0039] Determining the cohesion force based on the contact friction angle of the cutting surface of the blade and the internal friction angle of the formation;

[0040] The uniaxial compressive strength of the formation is determined based on the internal friction angle and cohesion of the formation.

[0041] Optionally, adjusting the drilling speed and drilling pressure of the core sampler according to the uniaxial compressive strength of the formation includes: if the uniaxial compressive strength of the formation is lower than a minimum threshold, increasing the drilling speed and decreasing the drilling pressure; if the uniaxial compressive strength of the formation is higher than a maximum threshold, decreasing the drilling speed and increasing the drilling pressure.

[0042] On the other hand, the present invention further proposes a machine-readable storage medium storing machine instructions, which, when executed on a machine, enables the machine to execute the well wall coring method described above.

[0043] A device for coring a well wall of the present invention comprises: a coring device and a controller; the coring device is used to obtain a core of a well wall; the controller is used to obtain the formation mechanics parameters of the well wall, and to adjust the working parameters of the coring device according to the formation mechanics parameters; the formation mechanics parameters include the cutting force and feed force of the drill bit, and the adjusting the working parameters of the coring device according to the formation mechanics parameters comprises: determining the uniaxial compressive strength of the formation according to the cutting force and feed force, and adjusting the drilling speed and drilling pressure of the coring device according to the uniaxial compressive strength of the formation. The device monitors the cutting force and feed force of the drill bit, and adjusts the drilling speed and drilling pressure of the coring drill bit in real time, thereby greatly improving the coring efficiency of the drill bit.

[0044] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0046] Figure 1 is a schematic diagram of a well wall coring device of the present invention;

[0047] Figure 2 It is a schematic diagram of an embodiment of a method for coring a well wall according to the present invention;

[0048] Figure 3 It is a schematic structural diagram of a device for coring a well wall according to the present invention;

[0049] Figure 4 It is a schematic diagram of the power nipple, coring nipple and coring nipple of the present invention;

[0050] Figure 5 It is a schematic diagram of the core extractor of the present invention;

[0051] Figure 6 It is a schematic diagram of the coring mechanism of the present invention;

[0052] Figure 7a-7b It is a schematic diagram of the power short section of the present invention;

[0053] Figure 8 is a schematic diagram of a coring pup joint of the present invention;

[0054] Fig. 9 It is a schematic diagram of a core storage device of the present invention;

[0055] Fig.10 is a schematic diagram of an electronic circuit of the present invention;

[0056] Fig.11It is a schematic diagram of the hydraulic nipple of the present invention.

[0057] Description of Reference Numerals

[0058] 100-Device for coring the well wall;

[0059] 101-coring device;

[0060] 102-controller;

[0061] 1-Core storage device;

[0062] 2-Coring sub;

[0063] 3-Hydraulic nipple;

[0064] 4-Power sub;

[0065] 5-Drill pipe;

[0066] 6-Electronic circuit;

[0067] 7- Controller;

[0068] 8-Drill bit;

[0069] 9-component a;

[0070] 10- component b;

[0071] 11- Component c;

[0072] 12- push rod;

[0073] 13-Drive. DETAILED DESCRIPTION

[0074] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0075] Embodiment 1

[0076] Figure 1 Schematic diagram of a well wall coring device of the present invention, such as Figure 1As shown, a device for coring a well wall 100 of the present invention comprises: a coring device 101 and a controller 102; the coring device 101 is used to obtain the core of the well wall; the controller 102 is used to obtain the formation mechanical parameters of the well wall, and adjust the working parameters of the coring device 101 according to the formation mechanical parameters; the formation mechanical parameters include the cutting force and feed force of the drill bit, and the adjusting the working parameters of the coring device according to the formation mechanical parameters includes: determining the uniaxial compressive strength of the formation according to the cutting force and feed force, and adjusting the drilling speed and drilling pressure of the coring device 101 according to the uniaxial compressive strength of the formation. The cutting force and feed force of the drill bit are the horizontal cutting force and the vertical rock force when the drill bit drills into the rock formation, which are obtained by a mechanical sensor. Uniaxial compressive strength refers to the load that a rock specimen can withstand per unit area when it is unidirectionally compressed to destruction, referred to as compressive strength. It is measured by connecting the standard specimen to the compression according to its water content state, and is divided into dry compressive strength, natural compressive strength and saturated compressive strength.

[0077] Specifically, the method of determining the uniaxial compressive strength of the formation according to the cutting force and the feed force includes: determining the contact friction angle of the cutting surface of the core drill blade according to the cutting force and the feed force; determining the internal friction angle of the formation according to the contact friction angle of the cutting surface of the blade; determining the cohesion according to the contact friction angle of the cutting surface of the blade and the internal friction angle of the formation; and determining the uniaxial compressive strength of the formation according to the internal friction angle of the formation and the cohesion. The blade is the part of the hollow drill bit that contacts the rock during the process of drilling into the rock. Cohesion, also known as internal cohesion, is the mutual attraction between adjacent parts of the same substance. This mutual attraction is a manifestation of the molecular force between molecules of the same substance and is only displayed when the molecules are very close. Cohesion can make substances aggregate into liquid or solid. In the liquid attachment layer in contact with the solid, due to the difference in relative magnitude between cohesion and adhesion, the liquid may wet the solid or not wet the solid.

[0078] The method of determining the contact friction angle of the cutting surface of the core drill blade according to the cutting force and the feed force includes: dividing the cutting stage and the friction stage according to the difference in the dominant force, and determining the contact friction angle of the cutting surface of the blade according to the relationship between the cutting force and the feed force in the two stages; in the cutting stage, drilling is mainly cutting, and the cutting force F t and feed force F n The relationship is: In the friction stage, drilling is dominated by friction, and the relationship between cutting force and feed force is:

[0079]

[0080] Among them, π(R 2 -r 2 ) is the cross-sectional area of ​​the drill bit, θ is the contact friction angle of the cutting surface, is the internal friction angle of the formation, R is the outer diameter of the drill bit, r is the inner diameter of the drill bit, and P f is the lateral pressure of surrounding rock; c is the cohesion.

[0081] Determining the uniaxial compressive strength of the formation according to the internal friction angle and cohesion of the formation includes:

[0082]

[0083] Among them, q c is the uniaxial compressive strength of the formation, c is the cohesion, is the internal friction angle of the formation.

[0084] The adjusting the drilling speed and drilling pressure of the core drill according to the uniaxial compressive strength of the formation includes: if the uniaxial compressive strength of the formation is lower than the minimum threshold, the rotation speed and drilling speed are increased and the drilling pressure is decreased; if the uniaxial compressive strength of the formation is higher than the maximum threshold, the rotation speed and drilling speed are decreased and the drilling pressure is increased. The drilling speed and drilling pressure of the core drill are adjusted by feedback according to the uniaxial compressive strength of the formation. The maximum threshold and the minimum threshold are determined according to the actual situation, and the adjustment accuracy of the rotation speed and drilling pressure is also determined according to the actual situation.

[0085] The core drill comprises a coring nipple, a hydraulic nipple, a power nipple, a core storage, a drill rod and a drill bit; the coring nipple is used to transmit the core to the core storage; the core storage is used to store the core; the hydraulic nipple and the power nipple are connected to the drill bit, and the hydraulic nipple and the power nipple are controlled by a controller to adjust the drilling pressure and drilling speed of the drill bit; the drill rod is connected to the coring nipple, the hydraulic nipple, the power nipple and the core storage.

[0086] The controller adjusts the hydraulic short section and the power short section on the coring device according to the uniaxial compressive strength of the formation, thereby controlling the drilling speed and drilling pressure of the drill bit to achieve efficient coring, and then transmits the core to the core storage device for storage through the coring short section. The device monitors the cutting force and feed force of the drill bit, and provides real-time feedback to adjust the coring. The coring device of the present invention overcomes the problems existing in the existing coring technology, and is simple to manufacture, highly maneuverable, and easy to operate. The coring method and device based on the measurement and feedback adjustment of the mechanical parameters of the rock wall of the screw-in type well can monitor and obtain the relevant formation mechanical parameters in the coring process, the drilling speed and drilling pressure of the drill bit at any time, and greatly improves the coring efficiency of the drill bit.

[0087] According to a specific implementation, the process of calculating the formation mechanics parameters by the real-time controller includes:

[0088] According to the difference of dominant forces, it is divided into cutting stage and friction stage. The contact friction angle of the cutting surface of the blade is determined according to the relationship between the cutting force and feed force in the two stages.

[0089] Step 1: In the cutting stage, when the feed force is less than the cutting force, drilling is mainly cutting, and the cutting force F t and feed force F n The relationship is:

[0090]

[0091] When the feed force is greater than the cutting force, drilling is mainly based on friction, and the cutting force F t and feed force F n The relationship is:

[0092]

[0093] Among them, π(R 2 -r 2 ) is the cross-sectional area of ​​the drill bit, θ is the contact friction angle of the cutting surface, is the internal friction angle of the formation, R is the outer diameter of the drill bit, r is the inner diameter of the drill bit, Pf is the lateral pressure of the surrounding rock, and c is the cohesion.

[0094] When the feed force is greater than the cutting force, the data points of the Ft-Fn relationship conform to the linear path passing through the second half of the cutting point. The slope of the straight line is the magnitude of tan(α+θ), and the slope of the straight line is a known quantity, thereby obtaining the contact friction angle θ between the bottom surface of the diamond saw blade and the formation.

[0095] Considering that the wear surface of the drill bit material on the cutting surface and the end face is uniform, it can be assumed that the contact friction angle θ' of the cutting surface is equal to the contact friction angle θ of the end face of the diamond blade, that is, θ' = θ. Substituting it into formula (1) can obtain the rake angle α of the diamond blade.

[0096] Step 2: Internal Friction Angle of the Complete Formation The specific calculation is as follows:

[0097]

[0098]

[0099] In the formula, is the friction angle between the fracture zone and the intact formation.

[0100] Substitute the contact friction angle θ and rake angle α of the cutting surface obtained in step 1 into equation (3) to calculate the friction angle between the broken zone and the intact formation: Then Substituting into equation (4) we can get the internal friction angle of the formation:

[0101] Step 3: The cohesion c is calculated as follows:

[0102] From formula (2), it can be deduced that when the feed force is greater than the cutting force, the intercept b of the linear path passing through the second half of the cutting point is:

[0103]

[0104] The cohesion is determined by formula (5) according to the contact friction angle of the cutting surface of the blade and the internal friction angle of the formation, including:

[0105]

[0106] Among them, c is the cohesion force, b is the intercept of the relationship curve between cutting force and feed force, is the internal friction angle of the formation, θ is the contact friction angle of the blade cutting surface, P f is the lateral pressure of the surrounding rock, R is the outer diameter of the drill bit, and r is the inner diameter of the drill bit.

[0107] Step 4: Determine the uniaxial compressive strength of the formation according to the internal friction angle and cohesion of the formation, including:

[0108]

[0109] Among them, q c is the uniaxial compressive strength of the formation, c is the cohesion, is the internal friction angle of the formation.

[0110] Step 5, based on the obtained formation uniaxial compressive strength feedback, the drilling speed and drilling pressure of the drill bit are adjusted to ensure the drilling efficiency and the coring rate of the drill bit. Specifically, if the formation uniaxial compressive strength is lower than the minimum threshold, the drilling speed is increased and the drilling pressure is decreased; if the formation uniaxial compressive strength is higher than the maximum threshold, the drilling speed is decreased and the drilling pressure is increased.

[0111] Embodiment 2

[0112] Figure 2 FIG. 1 is a schematic diagram of an embodiment of a method for coring a well wall according to the present invention, Figure 2 As shown, the method for coring a well wall of the present invention comprises: obtaining formation mechanical parameters to be measured in real time, and adjusting the working parameters of a coring device according to the formation mechanical parameters, wherein the formation mechanical parameters include cutting force and feed force;

[0113] The adjusting the working parameters of the corer according to the formation mechanical parameters includes: determining the uniaxial compressive strength of the formation according to the cutting force and the feed force, and adjusting the drilling speed and drilling pressure of the corer according to the uniaxial compressive strength of the formation feedback. The determining the uniaxial compressive strength of the formation according to the cutting force and the feed force includes: determining the contact friction angle of the blade cutting surface according to the cutting force and the feed force; determining the internal friction angle of the formation according to the contact friction angle of the blade cutting surface; determining the cohesion according to the contact friction angle of the blade cutting surface and the internal friction angle of the formation; determining the uniaxial compressive strength of the formation according to the internal friction angle and the cohesion. The adjusting the drilling speed and drilling pressure of the corer according to the uniaxial compressive strength of the formation includes: if the uniaxial compressive strength of the formation is lower than the minimum threshold, increasing the drilling speed and decreasing the drilling pressure; if the uniaxial compressive strength of the formation is higher than the maximum threshold, decreasing the drilling speed and increasing the drilling pressure.

[0114] Specifically, the controller transmits control signals to the power sub and the hydraulic sub for adjusting the drilling speed, rotation speed and drilling pressure. The power sub is used to adjust the drilling speed and rotation speed, and the hydraulic sub is used to adjust the drilling pressure. The coring sub is controlled to remove the core according to the drilling speed, rotation speed and drilling pressure provided above. The controller sends a core storage signal to the coring sub, and controls the coring sub to store the core in a core storage device (also called a core storage device). During this period, the feed force and cutting force of the drill bit are obtained in real time, and the slopes corresponding to the two stages are obtained. The contact friction angle, the friction angle of the rock and the front angle are deduced by the slopes corresponding to the two stages and the intercept of the friction stage. The internal friction angle of the rock is obtained according to the front angle, the contact friction angle and the friction angle between the broken zone and the intact rock. The cohesion of the rock is obtained according to the intercept, contact friction angle, internal friction angle, inner diameter and outer diameter of the real-time friction stage. The uniaxial compressive strength of the rock is obtained according to the rock cohesion and the internal friction angle of the rock. Finally, the uniaxial compressive strength is transmitted to the controller, and the controller feedback adjusts the drilling speed and drilling pressure.

[0115] The coring method of the present invention monitors the torque and feed force of the drill bit during the coring process, and the monitoring controller calculates the internal friction angle and cohesion of the formation to determine the uniaxial compressive strength of the formation. Finally, the rotation speed and drilling pressure of the coring drill bit are adjusted through controller feedback to ensure the coring efficiency of the drill bit.

[0116] Embodiment 3

[0117] Figure 3 Schematic diagram of the structure of a device for coring a well wall according to the present invention. Figure 3As shown, the device for coring the well wall includes: a controller 7, which is used to control the entire coring process, including data collection and opening or closing the coring device; the corer includes a core storage 1, which is used to store the obtained rock core; the coring short section 2 in the corer (with a coring mechanism built in), which is used to obtain the rock core; the hydraulic short section 3 and the power short section 4 in the corer, which are used to control the drilling pressure, drilling speed and rotation speed of the coring drill bit. The drilling speed refers to the speed at which the drill bit enters the rock, which is perpendicular to the rock direction, and the rotation speed refers to the speed at which the drill bit rotates, which is parallel to the rock surface; the drill rod 5 in the corer, which is used to connect the hydraulic short section 3, the power short section 4, the coring short section 2 and the core storage 1; and the electronic circuit 6 used to transmit signals and connect the controller and the corer. The electronic circuit is used for information exchange between the corer and the controller and power supply to the corer.

[0118] According to a specific embodiment, first, a core storage device (such as Fig. 9 1. Coring short section (as shown) Figure 8 2. Hydraulic nipple (as shown) Fig.11 3. Power sub 4 (as shown) Figure 7a and 7b As shown) and the drill rod 5 are connected and fixed in position, with the coring drill head facing downward; through the electronic circuit (as Fig.10 6 is connected to the controller 7 and one end of the drill rod 5; the hydraulic power supply in the controller 7 is turned on, and the signal is transmitted to the power sub 4 through the electronic circuit 6 and the drill rod to provide and adjust the drilling speed and rotation speed for the coring drill bit; the signal is transmitted to the hydraulic sub 3 through the power sub 4 to provide and adjust the drilling pressure for the coring drill bit; the drilling pressure, drilling speed and rotation speed are provided to the coring drill bit in the coring sub 2 through the power sub 4 and the hydraulic sub 3; the coring motor power supply is turned on, and the coring mechanism works normally. After the coring mechanism takes out the core, the coring drill bit is retracted through the controller 7; the core storage 1 is controlled by the controller 7 to store the core in the core storage 1.

[0119] Figure 5 It is a schematic diagram of the core extractor of the present invention; Figure 6 FIG. 1 is a schematic diagram of the coring mechanism of the present invention. Figure 6 The coring mechanism shown is built into the coring sub 2, which is composed of a coring drill bit 8, component a, component b, component c, a push rod 12 and a drive 13. The coring drill bit 8, component a 9, component b 10, component c 11, a push rod 12 and a drive 13 are assembled and then fixed in the coring sub 2, wherein the coring drill bit 8 is exposed. Figure 4 and 5 As shown, the drive 13 is built into the hydraulic nipple 3 .

[0120] According to a specific implementation, the process of calculating the formation mechanics parameters by the real-time controller includes:

[0121] According to the difference of dominant forces, it is divided into cutting stage and friction stage. The contact friction angle of the cutting surface of the blade is determined according to the relationship between the cutting force and feed force in the two stages.

[0122] Step 1: In the cutting stage, when the feed force is less than the cutting force, drilling is mainly cutting, and the cutting force F t and feed force F n The relationship is:

[0123]

[0124] When the feed force is greater than the cutting force, drilling is mainly based on friction, and the cutting force F t and feed force F n The relationship is:

[0125]

[0126] Among them, π(R 2 -r 2 ) is the cross-sectional area of ​​the drill bit, θ is the contact friction angle of the cutting surface, is the internal friction angle of the formation, R is the outer diameter of the drill bit, r is the inner diameter of the drill bit, Pf is the lateral pressure of the surrounding rock, and c is the cohesion.

[0127] When the feed force is greater than the cutting force, the data points of the Ft-Fn relationship conform to the linear path passing through the second half of the cutting point. The slope of the straight line is the magnitude of tan(α+θ), and the slope of the straight line is a known quantity, thereby obtaining the contact friction angle θ between the bottom surface of the diamond saw blade and the formation.

[0128] Considering that the wear surface of the drill bit material on the cutting surface and the end face is uniform, it can be assumed that the contact friction angle θ' of the cutting surface is equal to the contact friction angle θ of the end face of the diamond blade, that is, θ' = θ. Substituting it into formula (1) can obtain the rake angle α of the diamond blade.

[0129] Step 2: Internal Friction Angle of the Complete Formation The specific calculation is as follows:

[0130]

[0131]

[0132] In the formula, is the friction angle between the fracture zone and the intact formation.

[0133] Substitute the contact friction angle θ and rake angle α of the cutting surface obtained in step 1 into equation (3) to calculate the friction angle between the broken zone and the intact formation: Then Substituting into equation (4) we can get the internal friction angle of the formation:

[0134] Step 3: The cohesion c is calculated as follows:

[0135] From formula (2), it can be deduced that when the feed force is greater than the cutting force, the intercept b of the linear path passing through the second half of the cutting point is:

[0136]

[0137] The cohesion is determined by formula (5) according to the contact friction angle of the cutting surface of the blade and the internal friction angle of the formation, including:

[0138]

[0139] Among them, c is the cohesion force, b is the intercept of the relationship curve between cutting force and feed force, is the internal friction angle of the formation, θ is the contact friction angle of the blade cutting surface, P f is the lateral pressure of the surrounding rock, R is the outer diameter of the drill bit, and r is the inner diameter of the drill bit.

[0140] Step 4: Determine the uniaxial compressive strength of the formation according to the internal friction angle and cohesion of the formation, including:

[0141]

[0142] Among them, q c is the uniaxial compressive strength of the formation, c is the cohesion, is the internal friction angle of the formation.

[0143] Step 5, based on the obtained formation uniaxial compressive strength feedback, the drilling speed and drilling pressure of the drill bit are adjusted to ensure the drilling efficiency and the coring rate of the drill bit. Specifically, if the formation uniaxial compressive strength is lower than the minimum threshold, the drilling speed is increased and the drilling pressure is decreased; if the formation uniaxial compressive strength is higher than the maximum threshold, the drilling speed is decreased and the drilling pressure is increased.

[0144] A device for coring a well wall of the present invention comprises: a coring device and a controller; the coring device is used to obtain a core of a well wall; the controller is used to obtain the formation mechanics parameters of the well wall, and to adjust the working parameters of the coring device according to the formation mechanics parameters; the formation mechanics parameters include the cutting force and feed force of the drill bit, and the adjusting the working parameters of the coring device according to the formation mechanics parameters comprises: determining the uniaxial compressive strength of the formation according to the cutting force and feed force, and adjusting the drilling speed and drilling pressure of the coring device according to the uniaxial compressive strength of the formation. The device monitors the cutting force and feed force of the drill bit, and adjusts the drilling speed and drilling pressure of the coring drill bit in real time, thereby greatly improving the coring efficiency of the drill bit.

[0145] On the other hand, the present invention also provides an electronic device, which includes: at least one processor; a memory connected to the at least one processor; wherein the memory stores instructions that can be executed by the at least one processor, and the at least one processor implements the above-mentioned method of coring the well wall by executing the instructions stored in the memory.

[0146] The processor includes a kernel, which retrieves the corresponding program unit from the memory. One or more kernels can be provided, and the core extraction efficiency of the drill bit can be controlled by adjusting the kernel parameters.

[0147] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0148] An embodiment of the present invention provides a storage medium on which a program is stored. When the program is executed by a processor, the method for coring the well wall is implemented.

[0149] An embodiment of the present invention provides a processor, which is used to run a program, wherein the method for coring a well wall is executed when the program is run.

[0150] The embodiment of the present invention provides a device, which includes a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, the following steps are implemented: (method claim steps, sole right + subordinate right). The device in this article can be a server, a PC, a PAD, a mobile phone, etc.

[0151] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0152] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0153] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0154] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0155] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0156] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0157] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0158] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0159] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A device for coring a well wall, characterized in that: The device includes: corers and controllers; The corer is used to obtain the core of the well wall; The controller is used to obtain the formation mechanics parameters of the well wall and adjust the working parameters of the corer according to the formation mechanics parameters; The formation mechanical parameters include the cutting force and feed force of the drill bit, and adjusting the working parameters of the core drill according to the formation mechanical parameters includes: determining the uniaxial compressive strength of the formation according to the cutting force and feed force, and adjusting the drilling speed and drilling pressure of the core drill according to the uniaxial compressive strength of the formation.

2. The device according to claim 1, characterized in that Determining the uniaxial compressive strength of the formation according to the cutting force and the feed force comprises: Determining a contact friction angle of a cutting surface of a blade of a core remover according to the cutting force and the feed force; Determining the internal friction angle of the formation according to the contact friction angle of the cutting surface of the blade; Determining the cohesion force based on the contact friction angle of the cutting surface of the blade and the internal friction angle of the formation; The uniaxial compressive strength of the formation is determined based on the internal friction angle and cohesion of the formation.

3. The device according to claim 2, characterized in that The step of determining the contact friction angle of the cutting surface of the core drill blade according to the cutting force and the feed force comprises: According to the difference of dominant force, it is divided into cutting stage and friction stage, and the contact friction angle of the cutting surface of the blade is determined according to the relationship between the cutting force and feed force in the two stages; In the cutting stage, drilling is mainly cutting, and the cutting force F t and feed force F n The relationship is: In the friction stage, drilling is dominated by friction, and the relationship between cutting force and feed force is: Among them, π(R 2 -r 2 ) is the cross-sectional area of ​​the drill bit, θ is the contact friction angle of the cutting surface, is the internal friction angle of the formation, R is the outer diameter of the drill bit, r is the inner diameter of the drill bit, and P f is the lateral pressure of surrounding rock, and c is the cohesion.

4. The device according to claim 2, characterized in that Determining the cohesion according to the contact friction angle of the cutting surface of the blade and the internal friction angle of the formation comprises: Among them, c is the cohesion force, b is the intercept of the relationship curve between cutting force and feed force, is the internal friction angle of the formation, θ is the contact friction angle of the blade cutting surface, P f is the lateral pressure of the surrounding rock, R is the outer diameter of the drill bit, and r is the inner diameter of the drill bit.

5. The device according to claim 2, characterized in that Determining the uniaxial compressive strength of the formation according to the internal friction angle and cohesion of the formation includes: Among them, q c is the uniaxial compressive strength of the formation, c is the cohesion, is the internal friction angle of the formation.

6. The device according to claim 1, characterized in that The step of adjusting the drilling speed and drilling pressure of the core drill according to the uniaxial compressive strength of the formation comprises: If the uniaxial compressive strength of the formation is lower than a minimum threshold, the drilling speed is increased and the drilling pressure is decreased; If the uniaxial compressive strength of the formation is higher than the maximum threshold, the drilling speed is reduced and the drilling pressure is increased.

7. The device according to claim 1, characterized in that The corer comprises a coring nipple, a hydraulic nipple, a power nipple, a core storage device, a drill rod and a drill bit; The coring sub is used to transfer the core to the core storage device; The core storage device is used to store rock cores; The hydraulic sub and the power sub are connected to the drill bit, and the hydraulic sub and the power sub are controlled by a controller to adjust the drilling pressure and drilling speed of the drill bit; The drill rod is connected to the coring nipple, the hydraulic nipple, the power nipple and the core storage device.

8. A method for coring a well wall, characterized in that: The method includes: Acquire formation mechanics parameters to be measured in real time, and adjust working parameters of the core drill according to the formation mechanics parameters, wherein the formation mechanics parameters include cutting force and feed force; The adjusting the working parameters of the core drill according to the formation mechanical parameters includes: determining the uniaxial compressive strength of the formation according to the cutting force and the feed force, and adjusting the drilling speed and drilling pressure of the core drill according to the feedback of the uniaxial compressive strength of the formation.

9. The method according to claim 8, characterized in that Determining the uniaxial compressive strength of the formation according to the cutting force and the feed force comprises: Determining a contact friction angle of a cutting surface of a blade according to the cutting force and the feed force; Determining the internal friction angle of the formation according to the contact friction angle of the cutting surface of the blade; Determining the cohesion force based on the contact friction angle of the cutting surface of the blade and the internal friction angle of the formation; The uniaxial compressive strength of the formation is determined based on the internal friction angle and cohesion of the formation.

10. The method according to claim 8, characterized in that The step of adjusting the drilling speed and drilling pressure of the core drill according to the uniaxial compressive strength of the formation comprises: If the uniaxial compressive strength of the formation is lower than a minimum threshold, the drilling speed is increased and the drilling pressure is decreased; If the uniaxial compressive strength of the formation is higher than the maximum threshold, the drilling speed is reduced and the drilling pressure is increased.

11. A machine-readable storage medium, characterized in that: Machine instructions are stored, and when the machine instructions are executed on the machine, the machine executes the method for coring the well wall as claimed in any one of claims 8 to 10.

Images