RU2633884C2 - Near-bit module (versions) - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: in the device containing a housing with the central flushing hole, as well as electronic boards and a power source located in the housing holes, in its sealed part separated by the sealing elements. The wire connecting the electronic boards to the nipple part of the housing is fixed with a contact screw on the nipple part of the housing. The housing is formed of the nipple and the coupling part interconnected by a conical helical surface, in the hole of which an electrical insulating material is placed between the threaded surfaces of the mating parts. Insulators are placed on the part of the outer cylindrical surface along the housing length and in the inner channel of the nipple part of the housing. On the outer surface of the coupling part of the housing, in the area of the electronic boards and the power source, a protective sleeve is installed, one end of which is fixed by protrusions and grooves, and the other end - by screws. The coupling and nipple parts are provided with locking threads for connection to the bit and the shaft of the downhole motor, respectively.

EFFECT: increasing the reliability of the design and improving the quality of the transmitted signal by changing the design of the near-bit module.

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Description

The invention relates to the field of field geophysics and is intended to measure geophysical and technological parameters during drilling.

Known over-bit module (NDM) (US Pat. Of the Russian Federation for invention No. 2509209, 08.21.2012), which contains a housing with a central flushing hole, a central electrode electrically isolated from the housing located between the insulators, and also located in the recesses of the housing in its sealed part separated by sealing elements, electronic circuit boards. The fixation of the insulator located in the coupling part of the housing is made in the form of mating protrusions and grooves made in this insulator, the coupling part of the housing and the sleeve of the central electrode located opposite to the coupling part of the housing, mounted on the thread with the left direction.

A disadvantage of the known NDM is the destruction during operation of the insulating material that protects the central electrode as a result of dynamic loads, as well as the influence of the drilling fluid, whose properties can impede the passage of the signal.

The closest is a device for measuring geophysical and technological parameters during drilling with an electromagnetic communication channel (US Pat. RF utility model No. 27839, 05/30/2003).

The known device contains a downhole telemetry system (ZTS), including a drill string, a housing, a power supply, measuring modules, a receiving-processing device module, an electric splitter made in the form of a separate sub installed directly above the downhole motor, and also installed directly above the drill bit connected to the shaft of the downhole motor and the bit.

The NDM included in the known device comprises a housing with a central flushing hole, on which a central electrode is located, located between the insulators and electrically isolated from the housing, while electronic boards, measuring sensors, a power source and a transmitting device are located in the recesses of the housing, and a transmission device module ZTS introduced a receiving-processing device that receives signals from BAT.

The measured NDM parameters are encoded and transmitted by emitting the signal with the electrode of the module into the rock via a high-speed wireless electromagnetic communication channel to the electrical splitter of the main television system, where they are received, amplified, filtered, decoded and, together with other parameters measured by the basic television system (ZTS), are transmitted to the surface in real time via a powerful wireless electromagnetic channel of communication of this telesystem.

A disadvantage of the known device is its design.

The design of the known NDM provides for the placement of electronic boards in the recesses of its housing, which are protected from the outside by a casing, which is the central electrode. Since the NDM is rigidly connected to the spindle shaft of the downhole motor and to the bit, during rotation with them during drilling, the housing, and in particular the casing, undergo abrasion when it comes into contact with the rock being drilled, as a result of which depressurization of cavities in which electronic boards, which significantly reduces the life of the device, leads to the forced replacement of expensive BAT and increase the cost of measurements. Along with this, in the known device, the quality of the transmitted signal is influenced by the drilling fluid, whose properties can impede the passage of the signal.

The present invention solves the problem of improving the reliability of the design and improving the quality of the transmitted signal by changing the design of the BAT.

The problem is solved in that the NDM according to the first embodiment, comprising a housing with a central flushing hole, and also located in the recesses of the housing, in its sealed part, separated by sealing elements, the electronic circuit board and the power source, unlike the known one, has a housing formed of nipple and coupling parts interconnected by a conical helical surface, in the gap of which an insulating material is placed between the threaded surfaces of the mating parts, the outer cylindrical part insulators are placed along the length of the housing and in the internal channel of the nipple part of the housing. A protective sleeve is installed on the outer surface of the coupling part of the housing in the area where the electronic boards and the power source are located. One end of the sleeve on the case is fixed by means of protrusions and grooves, and the other end - by screws. The electronic boards are connected by an electric wire to the nipple part of the housing. In this case, the coupling part is provided with a locking thread for connecting to the bit, and the nipple part is equipped with a locking thread for connecting to the shaft of the downhole motor. To fix the insulator located on the part of the outer cylindrical surface along the length of the body, the nipple part is equipped with a fixing sleeve fixed by screws, and the contact surfaces of the fixing sleeve and insulator located on the part of the external cylindrical surface along the length of the body are made with mating protrusions and grooves. The wire connecting the electronic circuit boards located in the sealed part of the case with the nipple part of the case is fixed with a contact screw on the nipple part of the case.

The task of the second embodiment is solved in that the NDM of the second embodiment, comprising a housing with a central flushing hole, as well as housed in the recesses of the housing, in its sealed part, separated by sealing elements, electronic boards and a power source, in contrast to the known, has a housing formed from the nipple and coupling parts interconnected by a conical helical surface, in the gap of which an insulating material is placed between the threaded surfaces of the mating parts. On the part of the outer cylindrical surface along the length of the housing and in the inner channel of the coupling part of the housing are insulators. A protective sleeve is installed on the outer surface of the nipple part of the housing in the area where the electronic boards and the power source are located. One end of the sleeve on the case is fixed by means of protrusions and grooves, and the other end - by screws. The electronic boards are connected by an electric wire to the coupling part of the housing. In this case, the nipple part is provided with a lock thread for connection with a bit, and the coupling part is equipped with a lock thread for connection with a shaft of a downhole motor. To fix the insulator located on the part of the outer cylindrical surface along the length of the housing, the coupling part is provided with a fixing sleeve fixed by screws, and the contact surfaces of the fixing sleeve and insulator located on the part of the external cylindrical surface along the length of the housing are made with mating protrusions and grooves. The wire connecting the electronic boards located in the sealed part of the housing with the coupling part of the housing is fixed with a contact screw on the coupling part of the housing.

The drawings show

In FIG. 1 - NDM in the context of the first embodiment;

In FIG. 2 - General view of the NDM according to the first embodiment;

In FIG. 3 - NDM in the context of the second embodiment;

In FIG. 4 - General view of the NDM according to the second embodiment.

The inventive NDM according to the first embodiment (Fig. 1) is a composite, consisting of a nipple part 1 and a coupling part 2, a body with a central flushing hole 3 and with connecting locking threads at the ends 4 and 5. The locking thread 4 is made in the nipple part 1 of the housing and is designed to connect to the shaft of the downhole motor 6. Locking thread 5 is made in the coupling part 2 of the housing and is designed to connect to the bit 7.

In the sealed part of the NDM, there are electronic boards 8 and a power source 9, isolated from the ingress of the well fluid by the sealing elements 10 and the protective sleeve 11 located on the outer surface of the coupling part 2 of the housing. One end of the protective sleeve 11 is fixed by means of the protrusions 12 and the grooves 13 (Fig. 2), and the second end - by the screws 14 (Fig. 1).

The nipple part 1 (Fig. 1) and the coupling part 2 are interconnected by a conical screw surface, in the gap of which an insulating material 15 is placed between the threaded surfaces of the mating parts 15. On the part of the outer cylindrical surface along the length of the casing and in the inner channel of the nipple part 1 of the casing are insulators 16 and 17, respectively.

The insulator 16 (Fig. 2) is fixed by means of the protrusions 18 and the grooves 19, the reciprocal protrusions 20 and the grooves 21 of the fixing sleeve 22. The locking sleeve 22 is also fixed from turning by screws 23.

From the electronic circuit board 8 (Fig. 1), a wire 24 is removed, which creates contact with the insulated nipple part 1 of the housing. The wire 24 is fixed with a contact screw 25. The wire is output through the pressure seal 26.

The inventive NDM according to the second embodiment (Fig. 3) is a composite, consisting of a coupling part 27 and a nipple part 28, a housing with a central flushing hole 3 and with connecting locking threads at the ends 4 and 5. The locking thread 4 is made in the coupling part 27 of the housing and is designed to connect to the shaft of the downhole motor 6. The locking thread 5 is made in the nipple part 28 of the housing and is designed to connect to the bit 7.

In the sealed part of the NDM, there are electronic boards 8 and a power source 9, isolated from the ingress of the well fluid by the sealing elements 10 and the protective sleeve 11 located on the outer surface of the nipple part 28 of the housing. One end of the protective sleeve 11 is fixed by means of the protrusions 12 and the grooves 13 (Fig. 4), and the second end - by the screws 14 (Fig. 3).

The coupling part 27 (Fig. 1) and the nipple part 28 are interconnected by a conical screw surface, in the gap of which an insulating material 15 is placed between the threaded surfaces of the mating parts 15. On the part of the outer cylindrical surface along the length of the housing and in the inner channel of the coupling part 27 of the housing are insulators 16 and 17, respectively.

The insulator 16 (Fig. 4) is fixed by means of the protrusions 18 and the grooves 19, the reciprocal protrusions 20 and the grooves 21 of the fixing sleeve 22. The locking sleeve 22 is also fixed from rotation by screws 23.

From the electronic circuit boards 8 (Fig. 3), a wire 24 is removed, which creates contact with the insulated sleeve part 27 of the housing. The wire 24 is fixed with a contact screw 25. The wire 24 is output through the pressure seal 26.

NDM is installed directly between the shaft of the downhole motor 6 and the bit 7 using locking threads 4 and 5, respectively.

The system operates as follows. Information measured by sensors located in compartments with electronic boards 8 is transmitted by means of an electromagnetic signal to the main ZTS (not shown). The transmission of an electromagnetic signal involves the presence of an electric dipole. An electric dipole is formed by the NDM housing, which in its upper part is connected to the shaft of the downhole motor 6 by a lock thread 4, and in the lower part by a lock thread 5 is connected to the bit 7. Direct contact with the rock is formed through the bit 7. The signal is transmitted using an electromagnetic communication channel, which provides for the presence of an electrical separator that electrically separates the upper and lower parts of the dipole.

According to the first embodiment, the electric separator is formed by the coupling part 1 and the nipple part 2 of the NDM housing, insulated from each other by electrical insulating material 15 and insulators 16 and 17.

According to the second embodiment, the electric separator is formed by the coupling part 27 and the nipple part 28 of the NDM housing, insulated from each other by electrical insulating material 15 and insulators 16 and 17.

The advantages of the proposed device arise from the design features of its layout, namely, from the location of the electric separator directly in the body of the NDM, which in its upper part is connected to the shaft of the downhole motor 6, and in its lower part has contact directly with the rock through the bit 7, which eliminates the effect of the drilling fluid on the transmitted signal.

Claims (8)

1. Supraslot module containing a housing with a Central flushing hole, as well as located in the recesses of the housing, in its sealed part, separated by sealing elements, electronic boards and a power source, characterized in that the housing is formed of nipple and coupling parts connected by a conical a screw surface, in the gap of which an insulating material is placed between the threaded surfaces of the mating parts, on the part of the outer cylindrical surface along the length of the housing and in the inner channel insulators are placed on the nipple part of the case, as well as a protective sleeve mounted on the outer surface of the sleeve part of the case in the area of electronic circuit boards connected by an electric wire to the nipple part of the case, while the sleeve part is provided with a lock thread for connection with a bit, and the nipple part is equipped with a lock thread for connection to the shaft of the downhole motor. 2. The pre-bit module according to claim 1, characterized in that for fixing the insulator located on a part of the outer cylindrical surface along the length of the body, the nipple part is provided with a fixing sleeve fixed by screws, and the contact surfaces of the fixing sleeve and insulator located on a part of the external cylindrical surface along the length of the body, made with reciprocal protrusions and grooves. 3. The pre-bit module according to claim 1, characterized in that one end of the sleeve on the body is fixed by means of protrusions and grooves, and the other end - by screws. 4. The pre-bit module according to claim 1, characterized in that the wire connecting the electronic boards located in the sealed part of the housing with the nipple part of the housing is fixed with a contact screw in this housing. 5. A hollow module containing a housing with a central flushing hole, as well as electrical boards and a power source located in the recesses of the housing, in its sealed part, separated by sealing elements, characterized in that the housing is formed of nipple and coupling parts connected by a conical a helical surface in the gap of which an insulating material is placed between the threaded surfaces of the mating parts, a part of the outer cylindrical surface along the length of the housing and the inner channel m the casing part of the casing is made with an electrical insulating coating, as well as a protective sleeve mounted on the outer surface of the casing part of the casing in the area of electronic circuit boards connected by an electric wire to the casing part of the casing, while the nipple part is provided with a lock thread for connection with a bit, and the clutch part is provided locking thread for connection to the shaft of the downhole motor. 6. The over-bit module according to claim 5, characterized in that for fixing the insulator located on a part of the outer cylindrical surface along the length of the housing, the coupling part is provided with a fixing sleeve fixed by screws, and the contact surfaces of the fixing sleeve and insulator located on a part of the external cylindrical surface along the length of the body, made with reciprocal protrusions and grooves. 7. The pre-bit module according to claim 5, characterized in that one end of the sleeve on the body is fixed by means of protrusions and grooves, and the other end - by screws. 8. The pre-bit module according to claim 5, characterized in that the wire connecting the electronic boards located in the sealed part of the housing with the coupling part of the housing is fixed with a contact screw in this housing.

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