Near-bit drilling parameter measuring nipple

Abstract

The utility model discloses a near-bit drilling parameter measuring pup joint, which relates to the technical field of petroleum and natural gas engineering, and comprises a pipe body, the upper end of the pipe body is provided with a first connecting part, the lower end of the pipe body is provided with a second connecting part, the pipe body is internally provided with a flow channel for conveying drilling fluid, and the flow channel is provided with a first connecting part and a second connecting part. A first through hole is formed in the side wall of the pipe body; the at least two strain gauges are adhered to the outer side wall of the pipe body and are used for measuring the torsional stress and the bit pressure of the drill string; the first pressure sensor and the second pressure sensor are arranged in the flow channel of the pipe body, a pressure measuring hole of the first pressure sensor is connected with the first through hole through a first pipeline, and a pressure measuring hole of the second pressure sensor is communicated with the flow channel. According to the invention, the bit pressure, torque, annulus and drill string internal pressure data of an underground drill string can be measured in real time in the drilling operation process.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of petroleum and natural gas engineering, especially to a near-bit drilling parameter measuring nipple. BACKGROUND

[0002] With the rapid development of special technology drilling techniques such as directional well, horizontal well, branch well and large displacement well, the complexity of drilling operation also increases. In the drilling operation process, the rotating power on the drill bit is transmitted to the drill bit through the drill string by the driving device on the drilling platform. Due to the large inclination angle and long horizontal section, a large frictional torque is generated, which results in a certain loss of the drilling pressure and torque output from the ground to the drill bit, and sometimes even a holding pressure phenomenon. In addition, with the increase of drilling depth, the delay problem of real-time data transmission to the ground is increasingly prominent, which seriously affects the accuracy of the data, and real-time and accurate data are crucial for drilling operation under complex geological conditions.

[0003] In the drilling process, the drilling pressure is a key drilling parameter, and reasonable drilling pressure can improve the mechanical drilling speed and reduce the drilling cost. However, if the drilling pressure is too large, it may cause the pipe string to bend, increase the additional contact force with the well wall, and reduce the effective axial force on the drill string. Too large drilling pressure may also cause drill bit wear and premature damage to the cutting teeth, greatly reducing the service life. Drilling pressure and torque can reflect the stress of the drill string and the drilling condition of the drill bit, and real-time monitoring of drilling pressure and torque can prevent accidents such as pipe sticking.

[0004] Real-time measurement of bottom hole pressure is also crucial. When drilling in high-permeability formations, the bottom hole pressure is higher than the formation pressure, which will cause the drilling fluid to seep into the formation, causing "drilling fluid loss". If not treated in time, it will pollute the formation, and as the bottom hole pressure decreases, it will cause blowout accidents.

[0005] In the process of breaking rock in deep wells, downhole accidents occur frequently, resulting in low mechanical drilling speed, long drilling period, increased cost, long response time of traditional measurement tools, and insufficient identification accuracy of downhole conditions, which cannot meet the needs of modern drilling operations. Therefore, real-time drilling parameter measurement of the downhole drill bit is particularly important during the drilling operation. UTILITY MODEL CONTENT

[0006] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the utility model embodiment is to provide a near-bit drilling parameter measuring nipple, which can measure the drilling pressure, torque, annulus and drill string internal pressure data of the downhole drill string in real time during the drilling operation.

[0007] The specific technical scheme of the utility model embodiment is:

[0008] A near-bit drilling parameter measuring nipple, the near-bit drilling parameter measuring nipple comprises:

[0009] a pipe body, an upper end of the pipe body having a first connecting part, a lower end of the pipe body having a second connecting part, the pipe body having a flow channel for conveying drilling fluid, a side wall of the pipe body having a first through hole;

[0010] at least two strain gauges adhered to the outer side wall of the pipe body, the strain gauges being used for measuring torsional stress of the drill string and weight on bit of the drill string;

[0011] a first pressure sensor and a second pressure sensor arranged in the flow channel of the pipe body, a pressure measuring hole of the first pressure sensor being connected with the first through hole through a first pipe line, a pressure measuring hole of the second pressure sensor being in communication with the flow channel.

[0012] Preferably, the outer side wall of the pipe body has a groove, and the strain gauges are adhered to the bottom of the groove.

[0013] Preferably, the two strain gauges are arranged symmetrically.

[0014] Preferably, the near-bit drilling parameter measuring sub comprises:

[0015] a sealing plate for sealing the groove.

[0016] Preferably, the near-bit drilling parameter measuring sub comprises:

[0017] a protective cylinder arranged in the pipe body, the first pressure sensor and the second pressure sensor being arranged in the protective cylinder, the protective cylinder isolating the first pressure sensor, the second pressure sensor and the drilling fluid flowing through the flow channel.

[0018] Preferably, the near-bit drilling parameter measuring sub comprises:

[0019] a storage compartment arranged in the pipe body or the side wall of the pipe body, a circuit board being arranged in the storage compartment, the first pressure sensor, the second pressure sensor and the strain gauges being electrically connected with the circuit board.

[0020] Preferably, the near-bit drilling parameter measuring sub is used for connecting between a drill bit and a drill collar segment.

[0021] Preferably, the near-bit drilling parameter measuring sub comprises:

[0022] A sensor connector is disposed in the flow channel, the sensor connector having at least a portion of the first conduit and a second conduit connected to the flow channel, the first pressure sensor being connected to the first conduit in the sensor connector and the second pressure sensor being connected to the second conduit in the sensor connector.

[0023] Preferably, the first pipeline has a first sealing joint at its end, and the second pipeline has a second sealing joint at its end; the first pressure sensor is connected to the first sealing joint via a thread, and the second pressure sensor is connected to the second sealing joint via a thread.

[0024] Preferably, the protective sleeve is sealed to the sensor connector.

[0025] The technical solution of this utility model has the following significant beneficial effects:

[0026] The near-bit drilling parameter measurement sub described in this application can measure annular pressure data and drill string pressure data using a first pressure sensor. Two strain gauges can then be used to measure the drill string's pressure on the drill string and torque, enabling real-time assessment of complex downhole conditions. This will play a crucial role in improving drill string and drill bit lifespan and enhancing drilling operation safety. This near-bit drilling parameter measurement sub can be better applied to monitoring real-time drilling data in deep and ultra-deep wells, ensuring construction safety, reducing downhole accidents, and achieving safe and efficient drilling. Attached Figure Description

[0027] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0028] Figure 1 This is a schematic diagram of the near-bit drilling parameter measurement section in an embodiment of this utility model.

[0029] The reference numerals in the above figures are as follows:

[0030] 1. Pipe body; 11. First connecting part; 12. Second connecting part; 13. Flow channel; 14. First through hole; 15. Groove; 2. Strain gauge; 3. First pressure sensor; 4. Second pressure sensor; 5. Sealing plate; 6. Protective cylinder; 7. Storage chamber; 8. Sensor connector; 81. First sealing connector; 82. Second sealing connector; 9. First pipeline; 10. Second pipeline. Detailed Implementation

[0031] The details of this utility model can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of this utility model described herein are for illustrative purposes only and should not be construed as limiting the utility model in any way. Under the teachings of this utility model, those skilled in the art can conceive of any possible modifications based on this utility model, and these should all be considered to fall within the scope of this utility model.

[0032] To enable real-time measurement of downhole drill string pressure, torque, annular and drill string pressure data during drilling operations, this application proposes a near-bit drilling parameter measurement sub. Figure 1 This is a schematic diagram of the near-bit drilling parameter measurement sub in an embodiment of this utility model. Figure 1 As shown, the near-bit drilling parameter measurement section may include: a pipe body 1, with a first connecting part 11 at the upper end and a second connecting part 12 at the lower end; a flow channel 13 for conveying drilling fluid inside the pipe body 1; and a first through hole 14 on the side wall of the pipe body 1; a strain gauge 2 bonded to the outer side wall of the pipe body 1, which is used to measure the torsional stress and drilling pressure of the drill string; a first pressure sensor 3 and a second pressure sensor 4 disposed in the flow channel 13 of the pipe body 1; the pressure measuring hole of the first pressure sensor 3 is connected to the first through hole 14 through a first pipe 9; and the pressure measuring hole of the second pressure sensor 4 is connected to the flow channel 13.

[0033] like Figure 1 As shown, the pipe body 1 can be hollow, with its central part forming a flow channel 13 for conveying drilling fluid. The upper end of the pipe body 1 has a first connecting part 11, and the lower end of the pipe body 1 has a second connecting part 12. The first connecting part 11 can be connected to other components above the pipe body 1 by means of threads, and the second connecting part 12 can be connected to other components below the pipe body 1 by means of threads.

[0034] As a viable option, a near-bit drilling parameter measurement sub can be connected between the drill bit and the drill collar section.

[0035] like Figure 1As shown, strain gauge 2 can be bonded to the outer wall of tube 1. The extension direction of strain gauge 2 needs to be the same as that of the outer wall of tube 1, and the two need to be tightly fitted without air bubbles or wrinkles, and firmly bonded to ensure measurement accuracy. The appropriate type and specification of strain gauge 2 should be selected based on factors such as the required measurement accuracy, the material and structural characteristics of the object being measured, and the measurement environment. For example, for general metal structural component measurements, a metal foil strain gauge 2 can be used; for high-precision measurements, a semiconductor strain gauge 2 can be selected, etc. The torsional stress and drilling pressure of the drill string can be measured by forming a bridge with two strain gauges 2. To improve measurement accuracy, the two strain gauges 2 can be symmetrically arranged. Furthermore, the drilling pressure of the drill string can specifically include the tension and compression of the drill string.

[0036] To protect strain gauge 2 and prevent it from contacting the borehole sidewall and causing damage, such as Figure 1 As shown, the outer wall of the tube body 1 has a groove 15, and the strain gauge 2 is bonded to the bottom of the groove 15. Furthermore, in order to avoid damage or corrosion of the strain gauge 2 due to long-term contact with the liquid, the near-bit drilling parameter measurement section includes a sealing plate 5 for sealing the groove 15.

[0037] like Figure 1 As shown, the side wall of the tube body 1 has a first through hole 14, and the first pressure sensor 3 is disposed in the flow channel 13 of the tube body 1. The first through hole 14 enables the first pressure sensor 3 in the tube body 1 to measure the pressure data of the annulus outside the drill collar. The second pressure sensor 4 is disposed in the flow channel 13 of the tube body 1, and the pressure measuring hole of the second pressure sensor 4 is connected to the flow channel 13. The second pressure sensor 4 is used to measure the pressure inside the drill string.

[0038] Since drilling fluid flows through the flow channel 13 inside the pipe body 1, in order to seal and protect the first pressure sensor 3 and the second pressure sensor 4, such as Figure 1 As shown, the near-bit drilling parameter measurement sub may include: a protective cylinder 6 installed inside the pipe body 1, a first pressure sensor 3 and a second pressure sensor 4 installed in the protective cylinder, and the protective cylinder 6 isolates the first pressure sensor 3, the second pressure sensor 4 and the drilling fluid phase flowing through the flow channel 13.

[0039] like Figure 1 As shown, the near-bit drilling parameter measurement section may include a sensor connector 8 disposed in the flow channel 13. The sensor connector 8 has at least a portion of a first conduit 9 and a second conduit 10. The second conduit 10 is connected to the flow channel 13. A first pressure sensor 3 is connected to the first conduit 9 in the sensor connector 8, and a second pressure sensor 4 is connected to the second conduit 10 in the sensor connector 8. The sensor connector 8 is fixedly connected to the tube body 1 to ensure its stable position.

[0040] like Figure 1 As shown, the first pipe 9 has a first sealing joint 81 at its end, and the second pipe 10 has a second sealing joint 82 at its end. The first pressure sensor 3 is connected to the first sealing joint 81 via a thread, and the second pressure sensor 4 is connected to the second sealing joint 82 via a thread. This method ensures the airtightness of the pressure sensors when connected to the sealing joints.

[0041] like Figure 1 As shown, the protective sleeve 6 can be sealed and connected to the sensor connector 8, thereby fixing itself in place.

[0042] like Figure 1 As shown, the near-bit drilling parameter measurement sub may include a storage chamber 7 disposed within the casing 1 or on the side wall of the casing 1. The storage chamber 7 may be sealed. A circuit board is disposed within the storage chamber 7, and the first pressure sensor 3, the second pressure sensor 4, and the strain gauge 2 are all electrically connected to the circuit board. The circuit board can be used to store or transmit the acquired data to the ground. The storage chamber 7 may have adapters for connecting the wires of the pressure sensors and the strain gauge 2 to the circuit board. The circuit board can wirelessly transmit data to the receiving sub of the MWD system.

[0043] The near-bit drilling parameter measurement sub described in this application can measure annular pressure data and drill string pressure data using a first pressure sensor 3. Two strain gauges 2 can measure the drill string's drilling pressure and torque, enabling real-time assessment of complex downhole conditions. This will play a crucial role in improving drill string and drill bit lifespan and enhancing drilling operation safety. This near-bit drilling parameter measurement sub can be better applied to monitoring real-time drilling data in deep and ultra-deep wells, ensuring construction safety, reducing downhole accidents, and achieving safe and efficient drilling.

[0044] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute “may” include is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The disclosure of “a” or “an” used to describe an element, component, part, or step does not imply exclusion of other elements, components, parts, or steps.

[0045] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A near-bit drilling parameter measurement sub, comprising: The near-bit drilling parameter measuring short section comprises: a pipe body, an upper end of the pipe body having a first connecting part, a lower end of the pipe body having a second connecting part, the pipe body having a flow channel for conveying drilling fluid, a side wall of the pipe body having a first through hole; at least two strain gauges adhered to the outer side wall of the pipe body, the strain gauges being used for measuring torsional stress of the drill string and weight on bit of the drill string; a first pressure sensor and a second pressure sensor arranged in the flow channel of the pipe body, a pressure measuring hole of the first pressure sensor being connected with the first through hole through a first pipe line, a pressure measuring hole of the second pressure sensor being in communication with the flow channel.

2. The near-bit drilling parameter measurement sub of claim 1, wherein, The outer side wall of the pipe body has a groove, and the strain gauges are adhered to the bottom of the groove.

3. The near-bit drilling parameter measurement sub of claim 1, wherein, The two strain gauges are symmetrically arranged.

4. The near-bit drilling parameter measurement sub of claim 2, wherein, The near-bit drilling parameter measuring short section comprises: a sealing plate for sealing the groove.

5. The near-bit drilling parameter measurement sub of claim 1, wherein, The near-bit drilling parameter measuring short section comprises: a protection cylinder arranged in the pipe body, the first pressure sensor and the second pressure sensor being arranged in the protection cylinder, the protection cylinder isolating the first pressure sensor, the second pressure sensor and the drilling fluid flowing through the flow channel.

6. The near-bit drilling parameter measurement sub of claim 1, wherein, The near-bit drilling parameter measuring short section comprises: a storage bin arranged in the pipe body or the side wall of the pipe body, a circuit board being arranged in the storage bin, the first pressure sensor, the second pressure sensor and the strain gauges being electrically connected with the circuit board.

7. The near-bit drilling parameter measurement sub of claim 1, wherein, The near-bit drilling parameter measuring short section is used for being connected between a drill bit and a drill collar segment.

8. The near-bit drilling parameter measurement sub of claim 5, wherein, The near-bit drilling parameter measuring short section comprises: a sensor connector arranged in the flow channel, the sensor connector having at least part of the first pipe line, the sensor connector having a second pipe line, the second pipe line being in communication with the flow channel, the first pressure sensor being connected with the first pipe line in the sensor connector, and the second pressure sensor being connected with the second pipe line in the sensor connector.

9. The near-bit drilling parameter measurement sub of claim 8, wherein, An end of the first pipe line has a first sealing connector, and an end of the second pipe line has a second sealing connector; the first pressure sensor is connected with the first sealing connector through screw threads, and the second pressure sensor is connected with the second sealing connector through screw threads.

10. The near-bit drilling parameter measurement sub of claim 8, wherein, The protection cylinder is sealingly connected with the sensor connector.

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