A drilling tool for use in logging while drilling operations in marine riserless high angle deviated wells

Abstract

The application discloses a drilling instrument for logging while drilling in ocean non-standpipe high-inclination well operation and belongs to the technical field of ocean drilling equipment. The drilling instrument comprises a near-bit measuring assembly, a hollow screw assembly, an electromagnetic coupling transmission nipple, a rear resistivity assembly, a non-magnetic drill collar, a signal line telescopic rod assembly, a directional joint and MWD instrument with a rotary valve. The near-bit measuring assembly is combined with the rear resistivity assembly and a gamma measuring instrument in a mode, which can check formation data and improve data accuracy. The hollow screw assembly is connected with the near-bit measuring assembly through wires, signals are transmitted in a wired mode, the upper end of the screw is connected with the electromagnetic coupling transmission nipple to transmit signals at a short distance, and signal transmission is stable. The rear resistivity is connected with the MWD through the signal line telescopic rod, which can prevent the length error of the drilling instrument from causing the measuring instrument to be unable to use. The downhole power screw drilling instrument and the shorter near-bit measuring assembly can be used for directional operation of high-inclination wells.

Description

Technical Field

[0001] This invention relates to the field of marine drilling equipment technology, and in particular to a logging-while-drilling tool for high-angle well operations without risers in marine drilling. Background Technology

[0002] In drilling projects such as oil and geological exploration, it is essential to ensure that the drilling trajectory accurately follows the engineering design requirements, to obtain timely and accurate formation information, to identify thin reservoirs to improve drilling efficiency, and to transmit formation information to the surface in real time. This allows engineering technicians to promptly understand changes in the wellbore trajectory and formation information.

[0003] Currently, traditional logging-while-drilling (LOD) tools typically insert directional detection sensors into their tool sections and then connect them to the downhole logging instrument. However, in practice, it has been found that the distance between the LOD tool and the drill bit is relatively large, leading to a lag in measurement information. By the time an oil layer is detected, the drill bit has often advanced a considerable distance, at which point the reservoir has already been contaminated by drilling mud. In other words, the measurement accuracy of a single post-logging instrument or near-bit logging instrument cannot be fully guaranteed, and measurement errors during drilling result in inaccurate formation information identification.

[0004] Currently, near-bit measurement instruments are also available to address the issue of delayed measurement information caused by the distance between the logging-while-drilling gamma tool and the drill bit. However, near-bit measurement instruments are typically located at the lower end of the screw, making the stability of information transmission a significant problem. Most near-bit measurement technologies rely on electromagnetic wave jump transmission, which, in offshore open-circuit drilling, results in shorter transmission distances due to the mixing of drilling mud and seawater, making signal transmission difficult. Furthermore, near-bit instruments require batteries, leading to a relatively long overall length, which hinders the operation of highly deviated directional wells. Summary of the Invention

[0005] The purpose of this invention is to provide a logging-while-drilling tool for high-angle well operations without risers in marine environments, in order to solve the problems existing in the prior art. It provides stable signal transmission, improves data accuracy, and enables directional operations in high-angle wells.

[0006] To achieve the above objectives, the present invention provides the following solution: The present invention provides a logging-while-drilling tool for high-angle well operations without risers in marine environments, comprising...

[0007] A near-bit measurement assembly, used for real-time measurement of formation information, also includes a built-in gamma-ray measuring instrument; a hollow screw assembly is threadedly connected to the near-bit measurement assembly; and

[0008] A hollow screw assembly, wherein the interior of the near-bit measurement assembly is connected to the interior of the hollow screw assembly via an aviation connector, and a battery for supplying power to the near-bit measurement assembly is installed within the hollow screw assembly; and

[0009] An electromagnetic coupling transmission sub-section is provided, and the subsequent resistivity assembly is connected to the electromagnetic coupling transmission sub-section via a threaded connection. Signal transmission between the electromagnetic coupling sub-section and the subsequent resistivity assembly is achieved via a wired connection.

[0010] A post-resistivity assembly is provided, and a non-magnetic drill collar is threadedly connected to the post-resistivity assembly. The near-bit measurement assembly, the post-resistivity assembly, and the gamma ray measuring instrument are used to verify formation data.

[0011] A signal line telescopic rod assembly, wherein the interior of the rear resistivity assembly is connected to the lower end of the signal line telescopic rod assembly; and

[0012] The upper end of the signal line telescopic rod assembly is connected to the MWD instrument with a rotary valve via a directional connector. The MWD instrument with a rotary valve is installed inside the directional connector and its orientation is fixed by bolts.

[0013] Preferably, the electromagnetic coupling transmission sub includes an external connector, a lower internal end of the electromagnetic coupling transmission sub, and an upper internal end of the electromagnetic coupling transmission sub. The upper internal end of the hollow screw assembly and the lower internal end of the electromagnetic coupling transmission sub are connected via an aviation plug to transmit signals.

[0014] Preferably, the lower end of the rear resistivity assembly is connected to the upper end of the electromagnetic coupling transmission sub-section via an aviation plug to transmit signals, and the lower end of the electromagnetic coupling transmission sub-section and the upper end of the electromagnetic coupling transmission sub-section are inserted into each other.

[0015] Preferably, the upper part of the electromagnetic coupling transmission sub is a female plug that does not rotate; the lower part of the electromagnetic coupling transmission sub is a male plug that can rotate with the screw drill rotor.

[0016] Preferably, the male plug and the female plug transmit the measurement signal through electromagnetic coupling. Then, the female plug transmits the signal through a wire to the rotary valve in the uppermost MWD instrument with a rotary valve. The rotary valve transmits the signal to the ground through mud pulses.

[0017] The present invention achieves the following beneficial technical effects compared to the prior art:

[0018] The logging-while-drilling (MWD) tool for high-angle, riserless marine well operations of this invention comprises a near-bit measurement assembly, a hollow screw assembly, an electromagnetic coupling transmission sub, a rear resistivity assembly, a non-magnetic drill collar, a signal line telescopic rod assembly, a directional connector, and a MWD instrument with a rotary valve. The combination of the near-bit measurement assembly with the rear resistivity assembly and gamma ray measuring instrument allows for formation data verification, improving data accuracy and enabling better trajectory control by surface personnel during drilling in thin reservoirs. The hollow screw assembly and the near-bit measurement assembly are connected by electrical wires for signal transmission, with the upper end of the screw using an electromagnetic coupling transmission sub for close-range signal transmission, ensuring stable signal transmission. The rear resistivity assembly and the MWD are connected by a telescopic rod, preventing errors in drill string length from rendering the measuring instrument unusable. The use of a downhole power screw drill string and a shorter near-bit test connector enables directional operations in high-angle wells. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the logging-while-drilling tool used in marine well operations with high deviated angles and no riser, as described in this embodiment of the invention (presented in a segmented structure).

[0021] Figure 2 This is a structural diagram of an electromagnetic coupling transmission subsection.

[0022] The components include: 1. Near-bit measurement assembly; 2. Hollow screw assembly; 3. Electromagnetic coupling transmission sub; 301. External connector; 302. Lower internal end of electromagnetic coupling transmission sub; 303. Upper internal end of electromagnetic coupling transmission sub; 4. Rear resistivity assembly; 5. Non-magnetic drill collar; 6. Signal line telescopic rod assembly; 7. Directional connector; 8. MWD instrument with rotary valve. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] The purpose of this invention is to provide a logging-while-drilling tool for high-angle well operations without risers in marine environments, in order to solve the problems existing in the prior art. It provides stable signal transmission, improves data accuracy, and enables directional operations in high-angle wells.

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] like Figures 1-2 As shown, this invention provides a logging-while-drilling (MWD) tool for high-angle, riserless marine well operations, comprising a near-bit measurement assembly 1, a hollow screw assembly 2, an electromagnetic coupling transmission sub 3, a post-resistivity assembly 4, a non-magnetic drill collar 5, a signal line telescopic rod assembly 6, a directional connector 7, and an MWD instrument with a rotary valve 8. In the signal transmission of this drilling tool, only the electromagnetic coupling transmission sub 3 uses near-range electromagnetic coupling signal transmission; the rest are connected by wires, ensuring the stability of signal transmission.

[0027] The near-bit measurement assembly 1 and the hollow screw assembly 2 are connected by threads. The interior of the near-bit measurement assembly 1 and the interior of the hollow screw assembly 2 are connected by an aviation plug to ensure signal transmission. The hollow screw assembly 2 has a battery installed inside to supply power to the near-bit measurement assembly 1. The electromagnetic coupling transmission sub 3 is connected to the rear resistivity assembly 4 by threads. The rear resistivity assembly 4 is connected to the non-magnetic drill collar 5 by threads. The interior of the rear resistivity assembly 4 is connected to the lower end of the signal line telescopic rod assembly 6. The upper end of the signal line telescopic rod assembly 6 is connected to the MWD instrument 8 with a rotary valve to transmit signals. The MWD instrument 8 with a rotary valve is installed in the directional connector 7 and its orientation is fixed by bolts.

[0028] The near-bit measurement assembly 1 has a built-in gamma measurement instrument. While the near-bit measurement assembly 1 measures the formation data in real time, the gamma measurement instrument also measures the formation data. The resistivity and gamma data measured by the near-bit measurement assembly 1 can be compared and verified with the resistivity data measured by the post-resistivity assembly 4 and the gamma data measured by the gamma measurement probe instrument to ensure the accuracy of the data measured by the near-bit measurement assembly 1, thereby improving data accuracy and enabling ground personnel to better control the trajectory during drilling in thin reservoirs.

[0029] In one embodiment, the internal structure of the electromagnetic coupling transmission section 3 is as follows: Figure 2As shown, it consists of an external connector 301, an inner lower end 302 of the electromagnetic coupling transmission sub, and an inner upper end 303 of the electromagnetic coupling transmission sub. The inner upper end of the hollow screw assembly 2 can be connected to the inner lower end 302 of the electromagnetic coupling transmission sub via an aviation plug to transmit signals. The lower end of the rear resistivity assembly 4 is connected to the inner upper end 303 of the electromagnetic coupling transmission sub via an aviation plug to transmit signals. The inner lower end 302 and inner upper end 303 of the electromagnetic coupling transmission sub are inserted for signal transmission.

[0030] The signal transmission method for logging-while-drilling tools used in marine riserless, highly deviated well operations is as follows:

[0031] The signal measured by the near-bit measurement assembly 1 is transmitted upward through the internal wires of the instrument inside the hollow screw assembly 2 to the male connector of the drill bit inside the electromagnetic coupling transmission sub 3. The male connector and the female connector transmit the measured signal through the electromagnetic coupling principle. Then, the female connector transmits the signal through the wires inside the upper instrument to the rotary valve of the uppermost MWD instrument 8 with a rotary valve. The rotary valve transmits the signal to the ground through mud pulses.

[0032] The advantages of the logging-while-drilling tool of this invention for use in marine riserless high-angle well operations are as follows:

[0033] 1. By combining the near-bit measurement assembly 1 with the rear resistivity assembly 4 and the gamma measurement probe, logging data from the front and rear ends of the screw motor can be obtained and verified.

[0034] 2. Existing near-bit measurement uses electromagnetic waves to transmit signals. The signal is transmitted to the receiving connector at the top of the screw through the electromagnetic waves emitted by the near-bit joint. In drilling without a riser, the mud has a high salinity and the transmission distance is short, resulting in poor signal transmission. In this solution, a hollow screw assembly 2 is used. The signal from the near-bit measurement assembly 1 is transmitted to the top of the screw through the wires inside the screw. Then, an electromagnetic coupling transmission section 3 is used to transmit the information to the upper instrument at a short distance using the principle of electromagnetic coupling.

[0035] 3. The upper end of the inner assembly of the electromagnetic coupling transmission section 3 is a female sleeve that does not rotate, and the lower end is a male plug that can rotate with the screw drill rotor. The inner assembly transmits signals through electromagnetic coupling technology.

[0036] 4. The lower end of the MWD instrument 8 with rotary valve adopts a telescopic rod structure, which connects the signal lines of the lower instrument and transmits them to the ground through the MWD instrument 8 with rotary valve.

[0037] 5. The near-bit measurement assembly 1 is powered by a battery installed inside the hollow screw, eliminating the need to install a battery on the measurement connector. This results in a shorter connector length and a shorter drill string length at the bend, enabling the completion of directional well operations with high deviance.

[0038] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0039] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A logging-while-drilling tool for use in marine riserless high-angle well operations, characterized in that: include The near-bit measurement assembly is used for real-time measurement of formation information. The near-bit measurement assembly also has a built-in gamma measurement instrument. The hollow screw assembly is threadedly connected to the near-bit measurement assembly. as well as The hollow screw assembly is connected to the interior of the near-drill bit measurement assembly via an aviation connector. The hollow screw assembly contains a battery for supplying power to the near-drill bit measurement assembly. as well as An electromagnetic coupling transmission sub-section is provided, and the rear resistivity assembly is connected to the electromagnetic coupling transmission sub-section via a thread. The signal transmission between the electromagnetic coupling transmission sub-section and the rear resistivity assembly is achieved via a wire connection. as well as The post-resistivity assembly and the non-magnetic drill collar are connected to the post-resistivity assembly via threads. The near-bit measurement assembly, the post-resistivity assembly, and the gamma measurement instrument are used to verify the formation data. While the near-bit measurement assembly measures the formation data in real time, the gamma measurement instrument also measures the formation data. The resistivity and gamma data measured by the near-bit measurement assembly are compared and verified with the resistivity data measured by the post-resistivity assembly and the gamma data measured by the gamma measurement instrument to ensure the accuracy of the data measured by the near-bit measurement assembly, thereby improving data accuracy and enabling ground personnel to better control the trajectory during drilling in thin reservoirs. as well as The signal line telescopic rod assembly, wherein the interior of the rear resistivity assembly is connected to the lower end of the signal line telescopic rod assembly; as well as A directional connector is provided, wherein the upper end of the signal line telescopic rod assembly is connected to an MWD instrument with a rotary valve, and the MWD instrument with a rotary valve is installed in the directional connector and its orientation is fixed by bolts. Of the near-bit measurement assembly, hollow screw assembly, electromagnetic coupling transmission sub, rear resistivity assembly, non-magnetic drill collar, signal line telescopic rod assembly, directional joint, and MWD instrument with rotary valve, only the electromagnetic coupling transmission sub uses short-range electromagnetic coupling signal transmission; the rest are all wired connections. The signal from the near-bit measurement assembly is transmitted to the upper end of the screw via internal wires, and then the electromagnetic coupling transmission sub uses the electromagnetic coupling principle to transmit the information to the upper instrument at close range.

2. The logging-while-drilling tool for high-angle, riserless marine well operations according to claim 1, characterized in that: The electromagnetic coupling transmission sub includes an external connector, a lower internal end of the electromagnetic coupling transmission sub, and an upper internal end of the electromagnetic coupling transmission sub. The upper internal end of the hollow screw assembly and the lower internal end of the electromagnetic coupling transmission sub are connected via an aviation plug to transmit signals.

3. The logging-while-drilling tool for high-angle, riserless marine well operations according to claim 2, characterized in that: The lower end of the rear resistivity assembly is connected to the upper end of the electromagnetic coupling transmission subsection via an aviation plug to transmit signals. The lower end of the electromagnetic coupling transmission subsection and the upper end of the electromagnetic coupling transmission subsection are inserted into each other.

4. The logging-while-drilling tool for high-angle, riserless marine well operations according to claim 3, characterized in that: The upper part of the electromagnetic coupling transmission section is a female plug that does not rotate; the lower part of the electromagnetic coupling transmission section is a male plug that rotates with the screw drill rotor.

5. The logging-while-drilling tool for high-angle, riserless marine well operations according to claim 4, characterized in that: The male and female plugs transmit measurement signals through electromagnetic coupling. The female plug then transmits the signal via wires to the rotary valve in the uppermost MWD instrument. The rotary valve then transmits the signal to the ground via mud pulses.

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