Core storage short section and drilling type side wall coring instrument

Abstract

The invention relates to the technical field of oil well logging, in particular to a core storage short section and a drilling type well wall coring instrument. The core storage pup joint comprises a core storage pup joint base body, a core detection plectrum mechanism, a plectrum cylinder and a core storage cylinder, the plectrum cylinder is arranged on the periphery of the middle part of the core storage short section base body and is used for storing the plectrum; the core storage barrel is arranged in the core storage short section base body and used for storing the taken core; the rock core detection plectrum mechanism is arranged at the first end of the core storage short section base body and is used for counting the taken rock cores and pushing a plectrum to separate the taken rock cores. The drilling type side wall coring device needs to complete drilling coring and rock core recovery underground to guarantee completeness and storage of rock cores, so that the core storage short section is the key technology of the drilling type side wall coring device, and a structural mode that hydraulic pressure provides power to achieve rock core pushing, rock core separation and counting is provided for the drilling type side wall coring device. And the stability and the reliability of the core storage function of the drilling type side wall coring device are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum well logging, in particular to a core storage pup joint and a drilling-type well wall coring instrument. Background Art

[0002] With the development of well logging technology, oilfield exploration and reservoir development are becoming more and more complicated. It has become an important task to use core analysis to determine the permeability and formation pressure gradient of the reservoir. Geological exploration increasingly needs to obtain data such as fluid saturation, reservoir pressure, relative humidity of oil layers and reservoir properties of heterogeneous layers under bottom hole conditions that are closer to the actual formation conditions. The market urgently needs large-diameter well wall coring technology to meet oilfield service needs and solve complex reservoir exploration and development problems.

[0003] There is a very close connection between well logging and core data. Almost every analysis data of the core can establish a direct or indirect relationship with the well logging curve, such as core analysis density, porosity, saturation, permeability, capillary pressure, etc. These data can be obtained using the well logging curve, which is the basis for matching well logging and core analysis data, and is also an important data for testing and promoting the improvement of interpretation methods.

[0004] There are several main methods of underground coring, including drilling coring, pyrotechnics coring and drilling-type wellbore coring. Drilling coring is complicated in construction, takes a long time to coring, has a large span of coring layers and inaccurate positioning, and cannot achieve coring of various formations in the entire well section; the cores obtained by pyrotechnics coring are small in size and irregular in shape, which is not conducive to physical property analysis. Rotary wellbore coring makes up for the shortcomings of drilling coring and pyrotechnics coring. The core particles obtained are regular, and the lithology and oil content can be observed intuitively. Lithology, electrical properties, physical properties and oil content can also be directly analyzed and tested to obtain reservoir parameters such as saturation, porosity, permeability, etc., and the construction is simple and the cost is low. Therefore, the drilling-type wellbore coring technology has been welcomed by various oil companies and has a broad application prospect.

[0005] The drilling type sidewall coring device needs to complete drilling and coring, core recovery, and ensure the integrity and storage of the core underground. Therefore, the core storage pup joint is the key technology of the drilling type sidewall coring device. The stability and reliability of the core storage pup joint are the key to the successful storage of cores taken from the sidewall of the well logging device. The present invention provides a structural mode for the drilling type sidewall coring device to realize core pushing, core separation and counting by hydraulic power. The unique mechanical structure ensures the stability and reliability of the core storage function of the drilling type sidewall coring device. Summary of the invention

[0006] The purpose of the present invention is to provide a core storage pup joint and a drilling-type wellbore coring instrument, which can realize core pushing, core separation and counting, and ensure the stability and reliability of the core storage function of the drilling-type wellbore coring instrument.

[0007] A core storage pup joint comprises a core storage pup joint base, a core detection paddle mechanism, a paddle barrel and a core storage barrel; the paddle barrel is arranged at the outer periphery of the middle part of the core storage pup joint base and is used for storing paddles; the core storage barrel is arranged inside the core storage pup joint base and is used for storing taken cores; the core detection paddle mechanism is arranged at the first end of the core storage pup joint base and is used for counting taken cores and pushing the paddles to separate the taken cores.

[0008] Optionally, it also includes a hydraulic balancing mechanism, which is arranged on the second end side of the core storage short section base body and is used to provide pressure balance for the entire coring instrument during downhole operation.

[0009] Optionally, the core detection paddle mechanism includes a main body, a counting rotating assembly and a spacer pushing mechanism, the first end face of the main body is provided with a first circular hole and a second circular hole, the first circular hole is used to install the core storage barrel, and the second circular hole is used to assemble the paddle barrel; the counting rotating assembly is arranged on the outside of the first circular hole of the main body, and is used to detect the number of cores pushed into the core storage barrel and upload data; the spacer pushing mechanism is arranged on the second end face of the main body, the second end face is perpendicular to the first end face, and the spacer pushing mechanism is used to push one of the paddles in the paddle barrel into the core storage barrel.

[0010] Optionally, there are multiple picks, and sequential numbers are engraved on the surface.

[0011] Optionally, the hydraulic balancing mechanism includes a hydraulic balancing spring, a hydraulic balancing piston, a relief valve and a travel switch;

[0012] A cylinder is arranged on the side of the second end of the core storage short section base, the hydraulic balancing mechanism is arranged inside the cylinder, the first end of the cylinder is arranged with a first opening, the second end of the cylinder is arranged with a second opening, the first end of the hydraulic balancing spring is fixedly connected to the inside of the cylinder, the second end of the hydraulic balancing spring is connected to the first end of the hydraulic balancing piston for balancing the oil pressure; the hydraulic balancing piston is used for reciprocating motion in the cylinder to play the role of oil sealing and motion guiding; the overflow valve is arranged at the first end of the hydraulic balancing piston for overflow and pressure relief to protect the internal components of the coring instrument when the oil pressure inside the cylinder is too large; the travel switch is used for detecting the oil amount inside the cylinder and uploading data.

[0013] Optionally, a core storage shell is further provided outside the core storage barrel for protecting the core storage barrel.

[0014] A drilling-type well wall coring instrument comprises a control sub, a motion power sub, a motion sub and the core storage sub;

[0015] The second end of the movement short section is connected to the first end of the core storage short section, and a coring drill bit is arranged in the middle of the movement short section for coring, completing the entire coring action of the coring drill bit flipping, pressing down to cut rocks, breaking cores, core recovery, and core pushing in the oil well; the second end of the movement power short section is connected to the first end of the movement short section, and the movement power short section is provided with a core pushing mechanism for providing power for the movement short section and core pushing; the second end of the control short section is connected to the first end of the movement power short section for electronic control and hydraulic control; the core storage short section is used to receive the cores pushed by the core pushing mechanism, separate the cores and count them.

[0016] Optionally, it also includes an upper hydraulic pushing mechanism, an upper pushing arm, a lower hydraulic pushing mechanism and a lower pushing arm, which are used to push the coring instrument to the other side of the well wall to facilitate the coring drill bit to cut rock. The upper hydraulic pushing mechanism and the upper pushing arm are arranged on the control short section, and the lower hydraulic pushing mechanism and the lower pushing arm are arranged on the core storage short section.

[0017] Optionally, the motion sub also includes a coring bit steering mechanism, a coring bit pressing mechanism, a core breaking mechanism and a core pushing mechanism; the coring bit steering mechanism is used to turn the coring bit from a horizontal position to a vertical position to align with the well wall for cutting; the coring bit pressing mechanism is used to apply a certain pressure downward to the coring bit to increase cutting efficiency; the core breaking mechanism is used to lift the coring bit upward a certain distance after cutting a section of core, and then drop it quickly to break the core by inertial impact; the core pushing mechanism is used to push the broken core from the inside of the coring bit to the core storage barrel.

[0018] Optionally, the coring drill bit is a cylindrical structure with an inner cavity and cutter teeth at the end, wherein the inner cavity is used to store the cut core, and the cutter teeth are used to perform rotational cutting on the well wall.

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

[0020] 1. The present invention provides a core storage sub, which is a key part of a drilling-type wellbore coring instrument. It can count, separate, store and protect the cores, as well as balance and protect the pressure of the coring instrument in the high-temperature and high-pressure environment underground. This can improve the quantity and quality of coring, avoid damage and confusion of the cores, and ensure the stability and reliability of the coring instrument.

[0021] 2. The present invention provides a core detection paddle mechanism, which is a core counting and core separation mechanism of a core storage sub. When the core is pushed into the core storage barrel by the core pushing mechanism in the moving sub, it can first trigger the counting rotating component to rotate and trigger the travel switch to count and upload data, and then trigger the spacer pushing mechanism to push a spacer in the paddle barrel into the core storage barrel. In this way, the automatic counting and separation of the taken cores can be realized, which is convenient for subsequent analysis and processing.

[0022] 3. The present invention provides a pick barrel, which is a core separation mechanism of a core storage short section. It can store multiple thin picks engraved with sequential numbers, and the spring assembly applies preload force and transmission power. Every time a core is successfully taken, the detection pick mechanism will put a thin pick into the core storage barrel to separate the taken core from the core to be taken. In this way, the taken cores can be effectively separated, avoiding friction and collision between the cores, and it can also be used as a reference for counting whether the taken cores are successful.

[0023] 4. The present invention provides a hydraulic balancing mechanism, which is a pressure balancing mechanism for a core storage short section. It can use components such as a hydraulic balancing spring, a hydraulic balancing piston, a relief valve, and a travel switch to achieve the balance and regulation of the internal oil and external mud pressure of the coring instrument. When the internal oil pressure of the coring instrument is too high, the relief valve can overflow and release pressure to protect the internal components of the coring instrument; when the oil volume reaches the maximum or minimum limit, the travel switch can detect and upload data. This can ensure that the coring instrument can work stably in a high-temperature and high-pressure environment underground, and prevent failures or damage caused by pressure imbalance.

[0024] 5. The present invention provides a lower hydraulic pushing mechanism, which is a pushing mechanism for the core storage sub, which can use hydraulic power to push the coring instrument to one side of the well wall, so that the coring sub is close to the well wall. This can ensure good contact between the cutting surface of the coring drill bit and the well wall, and improve cutting efficiency and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 The present invention is a schematic diagram of an exploded structure of a core storage short section embodiment of a drilling-type well wall coring instrument.

[0027] Figure 2 The utility model is a schematic diagram of the overall structure of a drilling-type well wall coring instrument of the present invention.

[0028] Figure 3 The invention discloses an exploded schematic diagram of a hydraulic balance mechanism structure of a drilling-type well wall coring instrument.

[0029] Figure 4 The present invention is a schematic diagram of the structure of a core storage spacer tube mechanism of a drilling-type well wall coring instrument.

[0030] Figure 5 The present invention is a structural schematic diagram of a core detection paddle mechanism of a drilling-type well wall coring instrument.

[0031] Figure 6 The present invention is a schematic overall structural diagram of a core storage short section embodiment of a drilling-type well wall coring instrument.

[0032] Figure 7 The utility model is a schematic diagram of the overall structure of a hydraulic balance mechanism of a drilling-type well wall coring instrument of the present invention.

[0033] Figure 8 The present invention is a schematic diagram of the overall structure of a core detection paddle mechanism of a drilling-type well wall coring instrument.

[0034] Among them: 11-control short section, 12-movement power short section, 13-movement short section, 14-core storage short section, 15-coring drill bit, 16-coring well wall, 21-core detection paddle mechanism, 22-lower hydraulic push mechanism, 23-core storage barrel, 24-core storage barrel shell, 25-hydraulic balance mechanism, 26-core storage short section base, 27-paddle barrel, 28-lower hydraulic push mechanism cylinder cover, 29-paddle barrel fixing screw, 210-hydraulic balance mechanism fixing screw, 31-hydraulic balance spring upper cover, 32-hydraulic balance Balance spring, 33-hydraulic balance spring lower cover, 34-relief valve, 35-wear-resistant ring, 36-sealing ring, 37-hydraulic balance piston, 38-travel switch slide, 39-travel switch, 310-travel switch fixing seat, 311-pressure balance fixing seat, 41-paddle, 42-paddle cylinder base, 43-spring assembly, 51-end cover, 52-detection paddle mechanism upper seat, 53-counting rotation assembly, 54 second travel switch, 55-detection paddle mechanism lower seat, 56-spacer pushing mechanism, 6-pushing arm. DETAILED DESCRIPTION

[0035] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0036] The following detailed description is an exemplary description, which is intended to provide further detailed description of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art to which the present application belongs. The terms used in the present invention are only for describing specific embodiments, and are not intended to limit exemplary embodiments according to the present invention.

[0037] like Figure 1 As shown, the embodiments of the present invention are further described:

[0038] A core storage pup joint comprises a core storage pup joint base 26, a core detection paddle mechanism 21, a paddle barrel 27 and a core storage barrel 23; the paddle barrel 27 is arranged on the middle periphery of the core storage pup joint base 26, and is used to store the paddles 41; the core storage barrel 23 is arranged inside the core storage pup joint base 26, and is used to store the taken cores; the core detection paddle mechanism 21 is arranged at the first end of the core storage pup joint base 26, and is used to count the taken cores and push the paddles 41 to separate the taken cores.

[0039] like Figure 2 and Figure 6 As shown, the core storage pup joint base 26 is the main body of the core storage pup joint 14. The upper part of the core storage pup joint 14 is the first end, which is connected to the motion pup joint 13. The core pushing mechanism is arranged in the motion pup joint 13. The hydraulic power and electric power system of the core pushing mechanism are controlled by the control pup joint 11. Specifically, the core pushing mechanism can be a hydraulic push rod.

[0040] As a preferred example, it also includes a hydraulic balancing mechanism 25, which is arranged at the second end of the core storage short section base 26 and is fixed to the second end of the core storage short section base 26 by a hydraulic balancing mechanism fixing screw 210, so as to provide pressure balance for the entire coring instrument during downhole operation.

[0041] Specifically, the hydraulic balance mechanism 25 is disposed on the side of the second end of the core storage sub base 26 to provide the coring instrument with hydraulic balance with the pressure in the well and to perform pressure protection on the internal components of the coring instrument.

[0042] As a specific example of the above example, the hydraulic balance mechanism 25 includes a hydraulic balance spring 32, a hydraulic balance piston 37, a relief valve 34 and a travel switch 39;

[0043] An oil cylinder is arranged on the side of the second end of the core storage short section base 26, and the oil cylinder can provide hydraulic power for the lower hydraulic pushing mechanism 22. The hydraulic balancing mechanism 25 is arranged inside the oil cylinder, and a first opening is arranged at the first end of the oil cylinder, and a second opening is arranged at the second end of the oil cylinder. The first end of the hydraulic balancing spring 32 is fixedly connected to the inside of the oil cylinder, and the second end of the hydraulic balancing spring 32 is connected to the first end of the hydraulic balancing piston 37 for balancing the oil pressure; the hydraulic balancing piston 37 is used for reciprocating motion in the oil cylinder to play the role of oil sealing and motion guiding; the overflow valve 34 is arranged at the first end of the hydraulic balancing piston 37, and is used for overflow pressure relief to protect the internal components of the coring instrument when the oil pressure inside the oil cylinder is too large; the travel switch 39 is used to detect the oil amount inside the oil cylinder and upload data.

[0044] like Figure 3 and Figure 7As shown, it also includes a hydraulic balance spring upper cover 31 and a hydraulic balance spring lower cover 33, which are respectively arranged at the first end and the second end of the hydraulic balance spring 32, and play a role in stabilizing the position of the hydraulic balance spring 32 structure and the stretching stroke. The hydraulic balance spring 32 is a key component of hydraulic balance, and its expansion and contraction can balance the oil and external mud pressure. The first opening of the cylinder is used for the oil to pass through, and the second opening is connected to the mud. The hydraulic balance piston 37 can be provided with a wear-resistant ring 35 and a sealing ring 36. The hydraulic balance piston 37 reciprocates in the cylinder to play the role of oil sealing and motion guiding.

[0045] A relief valve 34 is arranged at the front end of the hydraulic balance piston 37. When the oil pressure inside the coring instrument is too high, the relief valve 34 overflows and releases the pressure to protect the internal components of the coring instrument.

[0046] It can also include a travel switch slide 38 and a travel switch fixing seat 310. The travel switch slide 38, the travel switch 39, and the travel switch fixing seat 310 constitute an oil quantity detection system of the hydraulic balance mechanism 25. The travel switch 39 is fixed to the travel switch fixing seat 310 and connected to the pressure balance fixing seat 311. The travel switch slide 38 is connected to the hydraulic balance piston 37. The travel switch slide 38 and the hydraulic balance piston 37 move together with the hydraulic balance spring 32. The position of the travel switch 39 is fixed. The position of the travel switch 39 is relative to the travel switch slide 38 and slides on its inner wall as the travel switch slide 38 moves. Two position protrusions are set with the internal stroke of the travel switch slide 38, and the travel switch 39 is triggered at the two extreme positions of maximum and minimum oil volume, respectively. The signal is uploaded as the detection feedback of the oil volume inside the coring instrument.

[0047] like Figure 5 and Figure 8 As shown as a specific example, the core detection paddle mechanism 21 includes a main body, a counting rotating assembly 53 and a spacer pushing mechanism 56. The first end face of the main body is provided with a first circular hole and a second circular hole. The first circular hole is used to install the core storage barrel 23, and the second circular hole is used to assemble the paddle barrel 27. The counting rotating assembly 53 is arranged on the outer side of the first circular hole of the main body, and is used to detect the number of cores pushed into the core storage barrel 23 and upload data. The spacer pushing mechanism 56 is arranged on the second end face of the main body, and the second end face is perpendicular to the first end face. The spacer pushing mechanism 56 is used to push a paddle 41 in the paddle barrel 27 into the core storage barrel 23.

[0048] like Figure 5As shown, as a specific example of the above example, the main body also includes a detection paddle mechanism upper seat 52 and a detection paddle mechanism lower seat 55, the counting rotating assembly 53 is installed on the detection paddle mechanism upper seat 52, including a rotating assembly and a second stroke switch 54, the counting rotating assembly 53 is pressed by the end cover 51, the central circular hole of the detection paddle mechanism upper seat 52 is the channel for the core to enter the core storage barrel 23 from the coring drill bit 15, and is connected to the first circular hole and has the same diameter. The core is pushed into the paddle mechanism upper seat 52 by the hydraulic push rod in the motion short section 13, that is, the core pushing mechanism, to trigger the rotating assembly, which can be specifically the core pushing mechanism pushing the rotating assembly to rotate, the rotating assembly is connected to the second stroke switch 54, and the rotation of the rotating assembly triggers the second stroke switch 54 to count and upload data. The detection paddle mechanism upper seat 52 is connected to the detection paddle mechanism lower seat 55 by bolts, and the spacer pushing mechanism 56 is installed on the detection paddle mechanism lower seat 55. A push plate is provided in the middle of the spacer pushing mechanism 56, and hydraulic push rods are provided on both sides. When the core passes through the detection paddle mechanism lower seat 55, the hydraulic system pushes the spacer pushing mechanism 56 to move upward, and the push plate in the middle of the spacer pushing mechanism 56 pushes one of the spacers in the paddle 41 into the core storage tube 23 of the first circular hole, thereby completing the spacer pushing work.

[0049] like Figure 4 As shown, as a preferred example, there are multiple picks 41, and the surface is engraved with sequential numbers. The pick 41 is a stack of several thin picks 41 engraved with sequential numbers. Each time a core is successfully taken, a pick 41 is inserted into the core barrel by the detection pick 41 mechanism to separate the taken core from the core to be removed. The pick 41 is used as a core separation component and can also be used as a reference for counting whether the core is successfully taken. The pick barrel base 42 is installed on the core storage short section base 26 through the pick barrel mechanism fixing screw 29, and the pick 41 and the spring assembly 43 are arranged inside. The spring assembly 43 presses the pick 41 to provide pre-tightening force and conveying power for the pick 41. The pick barrel base 42 is used to place the pick 41. One end has a channel for the pick 41 to pass through.

[0050] like Figure 1 and Figure 6 As shown as a preferred example, a core storage shell 24 is further provided outside the core storage cylinder 23 for protecting the core storage cylinder 23 .

[0051] like Figure 2As shown, a drilling-type wellbore coring instrument comprises a control subsection 11, a motion power subsection 12, a motion subsection 13 and a core storage subsection 14; the second end of the motion subsection 13 is connected to the first end of the core storage subsection 14, a coring drill bit 15 is arranged in the middle of the motion subsection 13 for coring, and the whole coring action of the coring drill bit 15, such as flipping, pressing down to cut rock, breaking core, core recovery and core pushing in the oil well, is completed; the second end of the motion power subsection 12 is connected to the first end of the motion subsection 13, and the motion power subsection 12 is provided with a core pushing mechanism for providing power for the motion subsection 13 and core pushing; the second end of the control subsection 11 is connected to the first end of the motion power subsection 12 for electronic control and hydraulic control; the core storage subsection 14 is used to receive the core pushed by the core pushing mechanism, separate the cores and count them.

[0052] Specifically, the control subsection 11 is the electronic control part and the hydraulic control part of the drilling well corer, which is responsible for the working control, ground communication and power transmission of the drilling well corer; the motion power subsection 12 provides power for the motion subsection 13 and the core pushing, and is also the installation carrier of the motion mechanism in the motion subsection 13, wherein the hydraulic circuit provides power for the motion mechanism to complete the motion trajectory function of the coring drill bit 15, and the motor and the reducer provide the coring drill bit 15 with the power for rotating and cutting rocks; the motion subsection 13 is a subsection for realizing the coring function, in which the whole coring action of the coring drill bit 15 in the oil well is completed, including the flipping, downward pressing and cutting of rocks, breaking of cores, core recovery and core pushing of the core bit 15; the core storage subsection 14 is pushed to the core storage subsection 14 by the core pushing mechanism after the well coring is completed.

[0053] As a preferred example of the above example, it also includes an upper hydraulic pushing mechanism, an upper pushing arm, a lower hydraulic pushing mechanism 22 and a lower pushing arm 6, which are used to push the coring instrument to the other side of the well wall to facilitate the coring drill bit 15 to cut the rock. The upper hydraulic pushing mechanism and the upper pushing arm are arranged on the control short section, and the lower hydraulic pushing mechanism 22 and the lower pushing arm 6 are arranged on the core storage short section.

[0054] Specifically, the telescopic rod of the upper hydraulic pushing mechanism is connected to the upper pushing arm, and also includes a lower hydraulic pushing mechanism 22 arranged on the outside of the core storage short section base, and the cylinder with the piston of the lower hydraulic pushing mechanism is sealed by the cylinder cover 28 of the lower hydraulic pushing mechanism. The lower hydraulic pushing mechanism 22 is connected to the lower pushing arm 6. The upper hydraulic pushing mechanism and the lower hydraulic pushing mechanism 22 are provided with pistons. Under the push of hydraulic power, the upper pushing arm and the lower pushing arm 6 are driven to open respectively. The cutting direction of the coring drill bit 15 of the coring instrument motion short section 13 is set on the other side of the upper and lower hydraulic pushing arms. The reverse thrust of the upper pushing arm and the lower pushing arm 6 makes the cutting surface of the coring drill bit 15 close to the well wall.

[0055] As a specific example, the motion sub 13 also includes a coring bit steering mechanism, a coring bit pressing mechanism, a core breaking mechanism and a core pushing mechanism, which are used for coring and completing the entire coring action of the coring bit 15 in the oil well, including flipping, pressing down to cut rock, breaking the core, recovering the core and pushing the core; the coring bit steering mechanism is used to turn the coring bit 15 from a horizontal position to a vertical position and aim at the well wall for cutting; the coring bit pressing mechanism is used to apply a certain pressure downward to the coring bit 15 to increase the cutting efficiency; the core breaking mechanism is used to lift the coring bit 15 up a certain distance after cutting a section of the core, and then quickly drop it to break the core by inertial impact; the core pushing mechanism is used to push the broken core from the inside of the coring bit 15 to the core storage tube 23.

[0056] Coring bit steering mechanism: used to control the direction of the coring bit 15 so that it can drill along a predetermined trajectory. There are many types of coring bit steering mechanisms, such as a curved lower portion, an offset motor, a rotary orienter, a guide coring bit 15, etc. Different types of coring bit steering mechanisms have different advantages and disadvantages and applicable scopes, and need to be selected according to the formation conditions and drilling targets.

[0057] The coring drill bit pressing mechanism is used to apply a certain axial pressure to the coring drill bit 15 so that it can effectively cut the rock. There are many types of coring drill bit pressing mechanisms, such as gravity pressing, hydraulic pressing, spring pressing, etc. Different types of coring drill bit pressing mechanisms have different adjustment accuracy and stability, which need to be adjusted according to the type of coring drill bit 15 and the hardness of the rock.

[0058] Core breaking mechanism: used to break the core from the rock formation during the coring process for easy extraction. There are many types of core breaking mechanisms, such as blade type, cone type, wedge type, etc. Different types of core breaking mechanisms have different breaking effects and application ranges, and need to be selected according to the core diameter and formation characteristics.

[0059] Core pushing mechanism: used to push the core from the coring drill bit 15 to the moving sub 13 and the core storage sub 14 during the coring process for easy storage. There are many types of core pushing mechanisms, such as hydraulic pushing, pneumatic pushing, spring pushing, etc. Different types of core pushing mechanisms have different pushing forces and speeds, which need to be selected according to the length and weight of the core.

[0060] As a specific example, the core drill bit 15 is a cylindrical structure, with an inner cavity and cutter teeth at the end, the inner cavity is used to store the cut core, and the cutter teeth are used to perform rotary cutting on the well wall. The cutter teeth cut the core and store it in the inner cavity. The core drill bit 15 can achieve efficient core cutting and collection, and is suitable for rocks of different hardness and properties.

[0061] When used, a drilling-type wellbore coring instrument embodiment includes the following steps:

[0062] The drilling-type well wall coring instrument of the present invention is connected to a drill pipe and lowered into the well.

[0063] In the well section where coring is required, the coring drill bit steering mechanism is controlled to turn the coring drill bit 15 from a horizontal position to a vertical position.

[0064] The upper hydraulic pushing mechanism and the lower hydraulic pushing mechanism 22 drive the upper pushing arm and the lower pushing arm 6 to open respectively, so that the cutting surface of the core drill bit 15 is close to the well wall and cuts against the well wall.

[0065] The core bit pressing mechanism is controlled to make the core bit 15 exert a certain pressure downward, thereby increasing the cutting efficiency.

[0066] After cutting a section of the core, the core drill bit 15 is controlled to be lifted a certain distance and then dropped quickly to break the core by inertial impact.

[0067] The core pushing mechanism is controlled to push the broken core from the inside of the coring drill bit 15 to the core storage tube 23 .

[0068] The core detection paddle mechanism 21 is controlled to count and separate the cores, and the data is uploaded to the surface.

[0069] Repeat the above steps until the desired number or length of cores is completed.

[0070] The borehole coring tool is pulled out of the well and the stored core is analyzed and processed.

[0071] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the above disclosed embodiments are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

Claims

1. A core storage short section, characterized in that: It comprises a core storage short section base (26), a core detection paddle mechanism (21), a paddle cylinder (27) and a core storage cylinder (23); The paddle cylinder (27) is arranged on the outer periphery of the middle part of the core storage short section base (26), and the paddle cylinder (27) is provided with a cavity for storing the paddle (41), and a paddle pressing mechanism (43) is arranged at one end of the cavity; The core storage barrel (23) is arranged inside the core storage short section base (26) and is used to store the taken cores; The core detection paddle mechanism (21) is arranged at the first end of the core storage subbase (26) and is used for counting the taken cores and pushing the paddle (41) to separate the taken cores.

2. A core storage short section according to claim 1, characterized in that: It also includes a hydraulic balancing mechanism (25), which is arranged on the second end side of the core storage short sub base (26) and is used to provide pressure balance for the entire coring instrument during downhole operation.

3. A core storage sub according to claim 1, characterized in that: The core detection paddle mechanism (21) comprises a main body, a counting rotating assembly (53) and a spacer pushing mechanism (56); a first circular hole and a second circular hole are opened on a first end face of the main body, the first circular hole is used to install the core storage barrel (23), and the second circular hole is used to assemble the paddle barrel (27); the counting rotating assembly (53) is arranged outside the first circular hole of the main body, and is used to detect the number of cores pushed into the core storage barrel (23) and upload data; the spacer pushing mechanism (56) is arranged on the second end face of the main body, the second end face is perpendicular to the first end face, and the spacer pushing mechanism (56) is used to push one of the paddles (41) in the paddle barrel (27) into the core storage barrel (23).

4. A core storage short section according to claim 1 or 3, characterized in that: There are a plurality of picks (41), and sequential numbers are engraved on the surface of the picks.

5. A core storage sub according to claim 2, characterized in that: The hydraulic balancing mechanism (25) comprises a hydraulic balancing spring (32), a hydraulic balancing piston (37), a relief valve (34) and a travel switch (39); An oil cylinder is arranged on the side of the second end of the core storage short section base (26); the hydraulic balance mechanism (25) is arranged inside the oil cylinder; the first end of the oil cylinder is arranged with a first opening; the second end of the oil cylinder is arranged with a second opening; the first end of the hydraulic balance spring (32) is fixedly connected to the inside of the oil cylinder; the second end of the hydraulic balance spring (32) is connected to the first end of the hydraulic balance piston (37) for balancing the oil pressure; the hydraulic balance piston (37) is used for reciprocating in the oil cylinder to play the role of oil sealing and movement guiding; the overflow valve (34) is arranged at the first end of the hydraulic balance piston (37) for overflow and pressure relief to protect the internal components of the coring instrument when the oil pressure inside the oil cylinder is too large; the travel switch (39) is used to detect the oil volume inside the oil cylinder and upload data.

6. A core storage sub according to any one of claims 1 to 5, characterized in that: A core storage shell (24) is also provided outside the core storage cylinder (23) for protecting the core storage cylinder (23).

7. A drilling coring instrument according to any one of the preceding claims, characterized in that: It comprises a control short section (11), a motion power short section (12), a motion short section (13) and the core storage short section (14); The second end of the movement subsection (13) is connected to the first end of the core storage subsection (14); a coring drill bit (15) is provided in the middle of the movement subsection (13) for coring, and completes the entire coring operation in the oil well, including turning over, pressing down to cut rock, breaking cores, recovering cores, and pushing cores; The second end of the motion power subsection (12) is connected to the first end of the motion subsection (13), and the motion power subsection (12) is provided with a core pushing mechanism for providing power for the motion subsection (13) and core pushing; The second end of the control short section (11) is connected to the first end of the motion power short section (12) for electronic control and hydraulic control; The core storage sub (14) is used to receive the cores pushed by the core pushing mechanism, separate the cores and count them.

8. The drilling-type wellbore coring instrument according to claim 7, characterized in that: It also includes an upper hydraulic pushing mechanism, an upper pushing arm, a lower hydraulic pushing mechanism (22) and a lower pushing arm (6), which are used to push the coring instrument to the other side of the well wall to facilitate the coring drill bit (15) to cut rocks. The upper hydraulic pushing mechanism and the upper pushing arm are arranged on the control short section, and the lower hydraulic pushing mechanism (22) and the lower pushing arm (6) are arranged on the core storage short section.

9. The drilling-type wellbore coring instrument according to claim 7 or 8, characterized in that: The motion sub (13) also includes a core bit steering mechanism, a core bit pressing mechanism, a core breaking mechanism and a core pushing mechanism; The coring drill bit steering mechanism is used to turn the coring drill bit (15) from a horizontal position to a vertical position so as to cut the well wall; The core drill bit pressing mechanism is used to make the core drill bit (15) exert a certain pressure downward to increase cutting efficiency; The core breaking mechanism is used to lift the core drill bit (15) upwards for a certain distance after cutting a section of the core, and then quickly drop it down to break the core by inertial impact; The core pushing mechanism is used to push the broken core from the inside of the coring drill bit (15) to the core storage barrel (23).

10. The drilling-type wellbore coring instrument according to any one of claims 7 to 9, characterized in that: The coring drill bit (15) is a cylindrical structure, with an inner cavity and cutter teeth at the end, the inner cavity is used to store the cut core, and the cutter teeth are used to perform rotational cutting on the well wall.

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