CN111441764A - Multi-coil underground communication nipple - Google Patents

Abstract

The invention discloses a multi-coil underground communication nipple, which comprises a nipple base body and more than three coils, wherein the more than three coils are wound on the nipple base body and are arranged at intervals, and any two adjacent coils are connected end to end. According to the multi-coil underground communication pup joint, more than three coils are wound on the pup joint base body and are arranged at intervals, any two adjacent coils are connected end to end, the relay communication requirement can be met, the communication signal is strong and stable, the application range is wide, the structure is simple, the coil is not prone to damage, the safety is high, the limitation on the logging-while-drilling operation mode is small, the electromagnetic noise is extremely low, the process cost is low, the economy is high, and the multi-coil underground communication pup joint is extremely suitable for being popularized and used in the industry.

Description

A multi-coil underground communication short section

technical field

The present invention generally relates to the field of petroleum logging, and in particular, relates to a multi-coil downhole communication sub.

Background technique

At present, in the process of logging while drilling, the electromagnetic wave MWD product is generally used for the formation physical parameter measurement while drilling and long-distance communication. The cost of the short section is high and it is easy to be damaged. If it breaks or falls into the well, it will easily cause a major operation accident. There are many problems in the process cost, and the insulation short section cannot be used in the communication environment that needs to be relayed. In addition to the insulation short section method Other non-professional antennas such as tuned antennas have low receiving efficiency and cannot meet the needs of long-distance communication.

Therefore, there is an urgent need in the industry for a multi-coil underground communication sub with good communication effect and low cost.

SUMMARY OF THE INVENTION

A main purpose of the present invention is to overcome at least one of the above-mentioned defects of the prior art, and to provide a multi-coil downhole communication sub with good communication effect and low cost.

For realizing the above-mentioned purpose of the invention, the present invention adopts following technical scheme:

According to one aspect of the present invention, there is provided a multi-coil downhole communication sub, including a sub base, the multi-coil downhole communication sub further comprising three or more coils, all of which are wound around the short on the base of the segment, and are arranged at intervals from each other, and any two adjacent coils are connected end to end.

According to an embodiment of the present invention, the number of the coils is 8-12, the width of each coil is 2-5 cm, and the distance between the outer edges of the two outermost coils is 2 to 4 meters.

According to an embodiment of the present invention, the number of the coils is 10, the width of each coil is 3 cm, and the distance between the outer edges of the two outermost coils is 3 meters.

According to an embodiment of the present invention, a groove is provided on the outer edge of the short joint base, and the coil is provided in the groove.

According to an embodiment of the present invention, the coil is encapsulated in a shock absorbing rubber.

According to an embodiment of the present invention, a steel wear-resistant sleeve is added to the shock-absorbing rubber outer ring.

It can be seen from the above technical solutions that the advantages and positive effects of the multi-coil underground communication sub-section of the present invention are:

In the multi-coil underground communication sub-section of the present invention, more than three coils are wound on the sub-section base and are arranged at intervals, and any two adjacent coils are connected end to end, which can meet the requirements of relay communication, not only the communication signal is strong It is stable, has a wide range of applications, has a simple structure, is not easy to be damaged, and has high safety. Industry promotion and use.

Description of drawings

The various objects, features and advantages of the present invention will become more apparent from consideration of the following detailed description of the preferred embodiments of the invention in conjunction with the accompanying drawings. The drawings are merely exemplary illustrations of the invention and are not necessarily drawn to scale. Throughout the drawings, the same reference numbers refer to the same or like parts.

in:

FIG. 1 is a schematic structural diagram of a multi-coil downhole communication sub-section according to an embodiment of the present invention.

Among them, the reference numerals are described as follows:

1. Sub-base body; 11. Groove; 2. Coil.

Detailed ways

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments, however, can be embodied in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed descriptions will be omitted.

In the following description of various examples of the invention, reference is made to the accompanying drawings, which form a part hereof, and in which are shown by way of example various exemplary structures, systems and steps in which aspects of the invention may be implemented. It is to be understood that other specific arrangements of components, structures, exemplary devices, systems and steps may be utilized and structural and functional modifications may be made without departing from the scope of the present invention. Furthermore, although the terms "top," "bottom," "front," "rear," "side," etc. may be used in this specification to describe various exemplary features and elements of the invention, these terms are used herein. for convenience only, such as the directions according to the examples depicted in the figures. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of structures to fall within the scope of the present invention.

As shown in FIG. 1 , the multi-coil downhole communication sub-section of this embodiment includes a sub-section base 1 , and the multi-coil down-hole communication sub-section further includes three or more coils 2 , and the three or more coils 2 are all wound on the sub-section base 1 , and are arranged at intervals, and any two adjacent coils 2 are connected end to end.

In this embodiment, the sub-section base 1 can be made of ferromagnetic material, such as pure iron, ferrite, iron-containing alloy, etc. The sub-section base 1 can be long cylindrical, and the sub-section base 1 is used for the All the coils 2 provide electromagnetic wave conduction channels, and the sub-base 1 in this embodiment can be a drilling tool such as a drill pipe or a drill collar; the outer edge of the sub-base 1, that is, the outer cylindrical surface as shown in the figure, is provided with a groove 11 , in this embodiment, the groove 11 can be opened on the casing of the drilling tool, the width of the groove 11 is adapted to the width of the coil 2, the number of grooves 11 is the same as that of the coil 2, and a plurality of grooves 11 can be They are equally spaced on the sub-section base 1, or other suitable subsections are used.

In this embodiment, the coil 2 is a solenoid-shaped coil, and is in the shape of a ring shape suitable for the groove 11 on the sub-base 1 . Due to the advantages of high temperature and high temperature stability, the coil 2 can also be made of other suitable materials; the width of each coil 2 is 2-5 cm, preferably the width of each coil 2 is 3 cm, and the width of the coil 2 is The transverse dimension of a single coil 2 in the figure; the coils 2 can be set to 8-12, preferably the number of coils 2 is 10, and all the coils 2 can be equally spaced on the sub-base 1, or other suitable subsection spacing can be used .

In this embodiment, the coils 2 are arranged in a one-to-one correspondence with the grooves 11 on the pup joint base 1 , and two adjacent coils 2 are connected end to end, and each coil 2 is encapsulated in the damping rubber and then embedded in the corresponding puppet In the groove 11 of the base body 1, the shock-absorbing rubber outer ring of each coil 2 is also equipped with a steel wear-resistant sleeve. This design has good shock-absorbing and wear-resistant performance, and can significantly reduce the disadvantage caused by vibration during drilling. It can effectively protect the coil 2 from the erosion and erosion of mud debris, etc., and effectively prolong the service life of the multi-coil 2 downhole communication sub-section; the distance between the outer edges of the two outermost coils 2 is 2 meters to 4 meters. , it is preferable that the distance between the outer edges of the two outermost coils 2 is 3 meters, and the two outermost coils 2 are the two coils 2 arranged at the beginning and the end of all the coils 2 on the sub-base 1, that is, the coils 2 in the figure Leftmost coil 2 and rightmost coil 2.

In this embodiment, the multi-coil downhole communication sub of the present application can meet the requirements of long-distance stable communication for measurement while drilling, and the receiving sensitivity of a single common type of coil is improved by about fifty times. A full-size coil with a width of one meter to four meters is used to achieve the communication effect of the insulation sub-section. This application not only achieves a comparable receiving effect, but also reduces the environmental noise by about fifty times under the same working conditions, avoiding the need for full-size coils. At the same time, the coil 2 of the present application has less winding length, not only less consumables, but also lower internal resistance and higher quality factor; and there is no technological means to manufacture the above-mentioned full-size coil.

In the multi-coil underground communication sub of the present invention, more than three coils 2 are wound on the sub-base 1 and are arranged at intervals, and any two adjacent coils 2 are connected end to end, which can meet the needs of relay communication, not only The communication signal is strong and stable, the application range is wide, the structure is simple, it is not easy to be damaged, the safety is high, the restriction on the logging while drilling operation mode is small, the electromagnetic noise is extremely low, the process cost is also low, and it has high economy. It is very suitable for promotion and use in the industry.

Those of ordinary skill in the technical field to which the present invention pertains should understand that the specific structures and processes shown in the foregoing detailed description section are merely exemplary, rather than limiting. Moreover, those of ordinary skill in the technical field of the present invention can combine the various technical features shown above in various possible ways to form new technical solutions, or make other changes, which all belong to the scope of the present invention. within.

Claims (6)

1. a multi-coil downhole communication sub, comprising a sub-base, characterized in that the multi-coil down-hole communication sub also comprises three or more coils, and the three or more coils are all wound on the sub-base , and are arranged at intervals, and any two adjacent coils are connected end to end. 2 . The multi-coil underground communication sub as claimed in claim 1 , wherein the number of the coils is 8-12, the width of each coil is 2-5 cm, and the distance between the outer edges of the two outermost coils is 2-5 cm. 3 . The spacing is 2 meters to 4 meters. 3 . The multi-coil underground communication sub as claimed in claim 1 , wherein the number of the coils is 10, the width of each coil is 3 cm, and the distance between the outer edges of the two outermost coils is 3. 4 . Meter. 4. The multi-coil downhole communication pup joint according to any one of claims 1-3, wherein a groove is provided on the outer periphery of the sub-section base, and the coil is arranged in the groove. 5 . The multi-coil downhole communication sub as claimed in claim 4 , wherein the coils are encapsulated in damping rubber. 6 . 6 . The multi-coil underground communication nipple according to claim 5 , wherein a steel wear-resistant sleeve is added to the shock-absorbing rubber outer ring. 7 .

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