A rotary steerable measurement while drilling unit

Abstract

The application discloses a rotary steering while-drilling measurement unit and belongs to the technical field of oil drilling and logging, which comprises a while-drilling measurement body, a resistivity probe compression sleeve, an upper fixed short section, a quick connection joint, an electronic warehouse upper joint, an electronic warehouse outer cylinder, a circuit framework and an electronic warehouse lower joint. The upper part of the while-drilling measurement body is provided with a measurement line socket, and the lower end threaded part is provided with a PEEK ring. The electronic warehouse upper joint is fixed with the upper fixed short section through a pin shaft, so that quick connection and stable assembly are realized. The measurement unit can be integrated in a rotary steering system, is suitable for assembly requirements of various sizes, can be freely combined with various functional modules according to the needs of directional drilling operation, is connected through mutually matched male and female buckles between modules, and realizes power supply and communication through a single bus. The application has compact structure and reliable connection, is suitable for a while-drilling measurement, gamma logging and resistivity logging integrated while-drilling measurement and control instrument string, and improves the efficiency and reliability of while-drilling measurement.

Description

Technical Field

[0001] This invention relates to the field of oil drilling logging technology, and in particular to a rotary steerable measurement while drilling unit. Background Technology

[0002] Measurement while drilling (MSWL) technology is widely used in oil drilling to acquire downhole formation parameters in real time. Existing MSWL units mostly adopt a split design, resulting in complex connections, low assembly efficiency, and susceptibility to loosening or unstable signal transmission in high-vibration environments. Especially with increasing drilling depth, downhole temperature, pressure, and vibration intensity rise significantly, leading to problems such as sealing failure, insulation degradation, and structural fatigue in traditional connection methods, severely impacting the continuity and accuracy of data acquisition. Furthermore, in rotary steerable systems, the connection and integration between multiple functional modules still face challenges such as complex wiring, communication delays, and insufficient reliability. This is particularly true for multi-functional integrated instrument strings such as MSWL, gamma ray logging, and resistivity logging, which place higher demands on the structural strength, connection reliability, and signal stability of the measurement unit.

[0003] While some existing technologies offer optimized designs for measurement-while-drilling (MWD) units, they lack integrated modularity, vibration resistance, and efficient transmission. Furthermore, they haven't systematically optimized assembly convenience and sealing reliability. Moreover, existing units are mostly custom-sized designs with poor versatility, making it impossible to freely combine modules according to the actual needs of directional drilling. This not only results in low adaptability but also increases equipment usage and maintenance costs, failing to meet the stringent operational requirements of complex well types. Therefore, there is an urgent need for a compact, reliable, modular, and universal MWD unit, and further, a modular, bus-based rotary steering system integration solution to enable free combination of modules and reduce equipment usage costs in drilling operations. Summary of the Invention

[0004] The purpose of this invention is to provide a reasonably structured, reliably connected, modular and universal measurement-while-drilling unit. This unit is adaptable to various size and specification assembly requirements and is suitable for integrated measurement-while-drilling, gamma logging and resistivity logging instrument strings. The modules can be freely combined according to the actual operation needs of directional drilling, effectively reducing the cost of use.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a rotary steerable measurement while drilling (MSWD) unit, comprising an MSWD body, a resistivity probe clamping sleeve, an upper fixed sub, a quick-connect connector, a quick-connect pressure ring, an upper connector for the electronic compartment, an outer cylinder for the electronic compartment, a circuit frame, and a lower connector for the electronic compartment. The upper connector for the electronic compartment is fixed to the upper fixed sub by a pin. The quick-connect pressure ring is installed inside the quick-connect connector. The circuit frame is disposed inside the outer cylinder of the electronic compartment. The upper connector for the electronic compartment is partially sleeved inside the quick-connect connector.

[0006] Furthermore, the upper part of the measurement while drilling body is provided with a measurement line socket, the lower end of the measurement while drilling body is provided with a thread, and a PEEK ring is provided at the thread at the lower end of the measurement while drilling body.

[0007] Furthermore, the connector on the electronic compartment and the circuit frame are detachably connected and fixed by positioning pins, achieving precise positioning of both and improving structural stability.

[0008] Furthermore, the upper fixed short section has a through hole along the axial direction. One end of the through hole is used to assemble the tip cap, and the other end of the through hole extends along the axial direction to the circuit frame, forming a component assembly and maintenance channel.

[0009] Furthermore, the upper connector of the electronic compartment is located on the outer peripheral wall inside the upper fixed short section and is fixed by a pin. The outer peripheral wall inside the upper fixed short section is provided with an annular sealing groove in the circumferential direction. The annular sealing groove is used to fit and install a sealing ring to achieve radial sealing between the upper connector of the electronic compartment and the upper fixed short section.

[0010] Furthermore, the lower connector of the electronic compartment is located on the outer peripheral wall inside the outer cylinder of the electronic compartment. Two annular sealing grooves are formed circumferentially on the outer peripheral wall inside the outer cylinder of the electronic compartment. The annular sealing grooves are used to fit and install a sealing ring to achieve radial sealing between the lower connector of the electronic compartment and the outer cylinder of the electronic compartment.

[0011] Furthermore, the upper connector of the electronic compartment is located on the outer peripheral wall inside the outer cylinder of the electronic compartment. Two annular sealing grooves are formed circumferentially on the outer peripheral wall inside the outer cylinder of the electronic compartment. The annular sealing grooves are used to fit and install sealing rings to achieve radial sealing between the upper connector of the electronic compartment and the outer cylinder of the electronic compartment.

[0012] The advantages of this invention compared to the prior art are: (1) The present invention adopts a quick-connect connector and pin shaft fixing structure, which is convenient to assemble and reliable to connect; the electronic compartment outer cylinder has a built-in circuit skeleton, which is compact and has good vibration resistance; it is suitable for integrated instrument strings for measurement while drilling, gamma logging and resistivity logging, which improves the overall efficiency of measurement while drilling; through PEEK ring and multi-stage sealing design, the insulation performance and pressure sealing level are significantly improved, which can adapt to harsher downhole conditions; the modular quick-connect design supports the rapid combination and replacement of instrument strings, reduces downtime and improves drilling efficiency; (2) This invention solves the problems of low measurement accuracy, slow transmission rate, short endurance, complicated assembly and poor downhole adaptability of traditional measurement while drilling units by optimizing structural design, integrating vibration resistance, high-efficiency transmission, long endurance and reliable sealing functions, thereby improving the stability, accuracy and efficiency of measurement while drilling. Attached Figure Description

[0013] Figure 1This is a schematic diagram of the structure of the measurement while drilling unit of the present invention.

[0014] In the figure: 1-Measurement while drilling body, 2-Resistivity probe clamping sleeve, 3-Upper fixed short section, 4-Quick connection connector, 5-Quick connection pressure ring, 6-Electronic compartment upper connector, 7-Electronic compartment outer cylinder, 8-Circuit frame, 9-Electronic compartment lower connector. Detailed Implementation

[0015] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0016] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0017] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0018] like Figure 1As shown, the measurement-while-drilling (MWD) unit of the present invention includes a MWD body 1, which has a measurement line socket at the top for connecting a signal transmission line; and a thread at the bottom, with a PEEK ring installed at the thread. The PEEK ring serves as insulation and sealing. Inside the MWD body 1, from top to bottom, are installed a resistivity probe clamping sleeve 2, an upper fixed short section 3, a quick-connect connector 4, a quick-connect pressure ring 5, an upper connector for the electronic compartment 6, an outer cylinder for the electronic compartment 7, a circuit frame 8, and a lower connector for the electronic compartment 9. The MWD unit is suitable for an integrated MWD instrument string for MWD, gamma logging, and resistivity logging. During the drilling process, the MWD unit can acquire relevant parameters of the downhole formation in real time. It has advantages such as compact structure, convenient assembly, reliable connection, strong vibration resistance, excellent sealing performance, and strong modular versatility. It can maintain high reliability and signal transmission stability even under downhole conditions of high temperature, high pressure, and strong vibration, effectively improving the efficiency and reliability of MWD. ​​At the same time, through modular and freely combinable design, it significantly reduces the overall equipment usage cost of directional drilling operations.

[0019] The resistivity probe clamping sleeve 2 is nested inside the upper part of the measurement-while-drilling body 1, and its lower end face is in close contact with the upper end face of the upper fixed short section 3. The upper connector 6 of the electronic compartment is partially fitted inside the quick-connect connector 4. A quick-connect pressure ring 5 is provided between the part of the upper connector 6 fitted into the quick-connect connector 4 and the quick-connect connector 4 to achieve quick locking. The upper connector 6 of the electronic compartment and the upper fixed short section 3 are fixed by a pin to ensure a stable connection. At the same time, the upper connector 6 of the electronic compartment and the circuit frame 8 are detachably connected and fixed by a positioning pin, which further improves the assembly accuracy and structural integrity of the two.

[0020] The upper fixed short section 3 has a through hole along the axial direction. One end of the through hole is equipped with a pointed pressure cap, and the other end of the through hole extends along the axial direction to the circuit frame 8, providing a convenient channel for subsequent component disassembly, assembly, and maintenance, effectively reducing maintenance difficulty.

[0021] The circuit frame 8 is installed inside the outer cylinder 7 of the electronic compartment and is used to fix the circuit board and related electronic components. The lower connector 9 of the electronic compartment is connected to the lower end of the outer cylinder 7 of the electronic compartment and is located at the lower end of the measurement-while-drilling body 1.

[0022] To enhance sealing performance, the upper connector 6 of the electronic compartment is located on the outer peripheral wall inside the outer cylinder 7 of the electronic compartment. Two annular sealing grooves are opened circumferentially on the outer peripheral wall inside the outer cylinder 7 of the electronic compartment. The upper connector 6 of the electronic compartment is fixedly connected to the fixed short section 3 by a pin and is located on the outer peripheral wall inside the upper fixed short section 3. An annular sealing groove is opened circumferentially on the outer peripheral wall inside the upper fixed short section 3. Each annular sealing groove is fitted with a sealing ring to achieve radial sealing between the upper connector 6 of the electronic compartment and the outer cylinder 7 of the electronic compartment and the upper fixed short section 3, respectively. Together with the PEEK ring at the lower end of the measurement while drilling body 1, a multi-stage sealing system is formed.

[0023] The lower connector 9 of the electronic compartment is located on the outer peripheral wall inside the outer cylinder 7 of the electronic compartment. Two annular sealing grooves are opened in the circumferential direction on the outer peripheral wall inside the outer cylinder 7 of the electronic compartment. A sealing ring is installed in the annular sealing groove to achieve a reliable seal between the lower connector 9 of the electronic compartment and the outer cylinder 7 of the electronic compartment, which significantly improves the overall pressure resistance and leakage prevention performance of the unit.

[0024] The measurement while drilling (MWD) unit can be integrated into the rotary steerable system. The modules are connected by mating male and female connectors and a single bus is used for power supply and communication. The MWD unit can be freely combined with various functional modules of the rotary steerable system according to the actual operation needs of steerable drilling. There is no need to adapt to special connecting parts, which greatly reduces the procurement and maintenance costs of special accessories. At the same time, the rapid combination and replacement of modules can effectively shorten the time for operation preparation and equipment maintenance, and reduce the loss of operation downtime.

[0025] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims

1. A rotary steerable measurement-while-drilling unit, characterized in that: The system includes a measurement-while-drilling (MWD) body (1), which is equipped with, from top to bottom, a resistivity probe clamping sleeve (2), an upper fixed short section (3), a quick-connect connector (4), a quick-connect pressure ring (5), an upper connector for the electronic compartment (6), an outer cylinder for the electronic compartment (7), a circuit frame (8), and a lower connector for the electronic compartment (9). The upper connector for the electronic compartment (6) is fixed to the upper fixed short section (3) by a pin. The quick-connect pressure ring (5) is installed inside the quick-connect connector (4). The circuit frame (8) is located inside the outer cylinder for the electronic compartment (7). The upper connector for the electronic compartment (6) is partially fitted inside the quick-connect connector (4).

2. The rotary directional drilling measurement unit as described in claim 1, characterized in that: The upper part of the measurement while drilling body (1) is provided with a measurement line socket, the lower end of the measurement while drilling body (1) is provided with a thread, and a PEEK ring is provided at the thread at the lower end of the measurement while drilling body (1).

3. The rotary steerable measurement-while-drilling unit as described in claim 1, characterized in that: The electronic compartment connector (6) and the circuit frame (8) are detachably connected and fixed by positioning pins, so as to achieve precise positioning and improve structural stability.

4. The rotary steerable measurement-while-drilling unit as described in claim 1, characterized in that: The upper fixed short section (3) has a through hole along the axial direction. One end of the through hole is used to assemble the tip cap, and the other end of the through hole extends along the axial direction to the circuit frame (8) to form a component assembly and maintenance channel.

5. A rotary steerable measurement-while-drilling unit as described in claim 1, characterized in that: The upper connector (6) of the electronic compartment is located on the outer peripheral wall inside the upper fixed short section (3) and is fixed by a pin. The outer peripheral wall inside the upper fixed short section (3) is provided with an annular sealing groove in the circumferential direction. The annular sealing groove is used to fit and install a sealing ring to achieve radial sealing between the upper connector (6) of the electronic compartment and the upper fixed short section (3).

6. The rotary steerable measurement-while-drilling unit as described in claim 1, characterized in that: The lower connector (9) of the electronic compartment is located on the outer peripheral wall inside the outer cylinder (7) of the electronic compartment. Two annular sealing grooves are opened in the circumferential direction on the outer peripheral wall inside the outer cylinder (7) of the electronic compartment. The annular sealing grooves are used to fit and install sealing rings to achieve radial sealing between the lower connector (9) of the electronic compartment and the outer cylinder (7) of the electronic compartment.

7. The rotary steerable measurement-while-drilling unit as described in claim 1, characterized in that: The upper connector (6) of the electronic compartment is located on the outer peripheral wall inside the outer cylinder (7) of the electronic compartment. Two annular sealing grooves are opened in the circumferential direction on the outer peripheral wall inside the outer cylinder (7) of the electronic compartment. The annular sealing grooves are used to fit and install sealing rings to achieve radial sealing between the upper connector (6) of the electronic compartment and the outer cylinder (7) of the electronic compartment.

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