RU2278236C1 - Controlled directional well and horizontal well drilling device - Google Patents

Abstract

FIELD: well drilling, particularly to control well direction.

SUBSTANCE: device comprises drilling bit, downhole motor with whipstock, whipstock position measuring module, hydraulic orientator and measuring and telemetric module arranged in non-magnetic sub and connected with ground-based reception and processing complex. Whipstock position measuring module comprises body with central flushing orifice on which electrode is arranged. The electrode is located between insulators and is electrically isolated from the body. Electric circuits, measuring sensors, power source and transmission means are installed in the body. Reception and processing means are included in measuring and telemetric module so that the reception and processing means is separated from whipstock position measuring module by electric spacer and is adapted to receive electric signals from whipstock position measuring module transmitter. Accelerometers may be included in measuring sensors of whipstock position measuring module. Whipstock, whipstock position measuring module and hydraulic orientator may be connected one to another by quick-releasable connector, for instance by thread.

EFFECT: increased well quality, possibility to use flexible drilling pipes, namely coiled tubing, for well drilling.

3 cl, 2 dwg

Description

The invention relates to the field of drilling and is intended to control the direction of the trajectory of directional and horizontal wells using flexible continuous drill pipes (coiled tubing).

When drilling directional and horizontal wells by the traditional method, the bottom of the drill string (BHA) is used, consisting of a bit, a downhole motor with a diverter installed at the bottom of the drill pipe, while the diverter is oriented due to rotation from the surface of the drill pipe string. Monitoring of the wellbore trajectory is carried out according to inclinometry and gamma-ray logging data.

Known navigation and technological computerized system (NTKS) "Wave" for monitoring the wiring of directional and horizontal wellbores (NTV "Logger". - Tver: Ed. AIS, 2002. - Iss. 94. - S.93-97) .

The Volna system developed by Soyuzpromgeofizika LLC contains a drill string, a downhole motor with a diverter, a chisel, and a hydraulic orientator. A downhole navigation device, which may include inclinometers, GK indicators, a pressure sensor placed in a non-magnetic sub, is lowered into the drill string on the wireline. The system includes a ground station.

NTKS “Volna” is designed to receive and process information about the nature of the wellbore curvature in real time, to predict and correct the wellbore trajectory.

Such a layout cannot be used when drilling using coiled tubing, because, due to its design features, coiled tubing units are not able to rotate the BHA. To orient the bit when drilling with coiled tubing, an orientator is included in the BHA, which rotates the BHA and bit at the required angle.

The orientator is controlled from the surface. The drive of this mechanism can be hydraulic or electric (via cable). The simplest is the differential pressure of the drilling fluid.

There is a known BHA arrangement for drilling directional wells with coiled tubing, comprising a downhole screw motor with a bent adapter (diverter), a double sub with a check valve, a non-magnetic weighted drill pipe (UBT) with measuring instruments for telemetry systems, a quick disconnect connector, an orientator, and a bend connector (Gruzdilovich L., Shurigin G., Kablash S. Drilling wells using coiled tubing. // Fuel and Energy Complex Technologies. Special supplement to the journal "Oil and Capital". - 2002. - No. 7. - P.34.).

Measuring instruments (inclinometric sensor, gamma-ray sensor, bit load sensor, etc.) are located in the drill collar in the immediate vicinity of the downhole motor and provide control over the drilling process.

Such an arrangement is effective when using an electric orientator controlled from the surface by means of a cable passed inside the pipe, while a non-magnetic drill collar with measuring instruments of telemetry systems can be placed below the guide tool (orientator).

When using a hydraulic orientator controlled from the surface through a differential pressure, it is very problematic to install a telesystem below the orientator due to the complexity of the technical task of cable routing through the hydraulic orientator, which drastically reduces the reliability of the BHA.

The proposed device solves the problem of increasing the reliability of drilling directional wells using coiled tubing, including a hydraulic orientator, by introducing a separate additional module for measuring the position of the diverter installed in the immediate vicinity of the latter, and using an additional wireless electromagnetic communication channel.

The problem is solved by the described device for drilling directional and horizontal wells, including a bit, a downhole motor with a diverter, a hydraulic orientator and a measurement and telemetry module located in the non-magnetic sub, connected via a cable to the ground receiving and processing complex, while between the diverter and the hydraulic the orientator installed a separate module for measuring the position of the deflector (MIPO), comprising a housing with a central flushing hole, on which Situated electrode disposed between the insulators and electrically insulated from the housing. The case contains electrical circuits, measuring sensors, a power source and a transmitting device, and a receiving and processing device is introduced into the measurement and telemetry module, separated from MIPO by an electric separator and receiving electromagnetic signals from the MIPO transmitting device.

The composition of the measuring sensors of the specified module includes accelerometers, in addition, the diverter, the specified module and the hydraulic orientator are interconnected by a quick coupling, for example, by means of a thread.

Figure 1 presents a General view of the device.

Figure 2 presents the design of the module for measuring the position of the diverter.

The proposed device on continuous flexible drill pipes 1 consists of a measurement and telemetry module (MIT) located inside a steel diamagnetic sub 2. A case-mounted electrical divider 3 is screwed onto the sub 2, a hydraulic orientator 4 is placed below, a position measurement module is connected to it (MIPO ) 5 deflectors, a downhole motor with a deflector 6 is screwed lower, and a chisel 7 is likely on the motor shaft.

In the MIT module there is a receiving-processing unit 8 of signals coming from the MIPO module.

MIPO (figure 2) consists of a housing 9, on which a central electrode 10 is placed, isolated from the housing by a coating 11 of electrical insulating material. In the housing there are recesses 12, in them are electrical circuits 13, measuring sensors 14, for example an accelerometer, and a power source 15.

The housing also houses a contact assembly 16 connecting the electrical circuit to the central electrode 10. All these elements are located in the sealed part of the module, isolated from the ingress of well fluid using sealing elements 17.

The device operates as follows.

The system descends into the borehole on a continuous flexible drill pipe 1 (see figure 1). The ground receiving-processing complex with the interface device (USO) and Note-book provides reception and delivery of information about the measured parameters.

The provision of information from the bottom of the well is carried out in stages. The information measured by IIEP 5 (which serves to control the installation and adjust the apsidal angle) is transmitted via a wireless electromagnetic communication channel to the MIT receiving-processing unit.

MIT, along with the data measured by it, also transmits to the surface via a wireline the data received from IIEP in the form of additional channels. On the surface, information is received and processed by the ground receiving and processing complex. Based on these data, the technologist gives a command to turn with the help of a hydraulic orientator 4 to a given angle of the diverter 6 with a bit 7.

The advantage of the proposed device arises from the design features of its layout, namely due to the introduction of a separate additional module for measuring the position of the diverter installed in the immediate vicinity of the latter. As a result, the reliability of the BHA design is increased, and high-quality wiring of directional and horizontal wells using coiled tubing, including a hydraulic orientator, is ensured.

Claims (3)

1. A device for conducting directional and horizontal wells, including a bit, a downhole motor with a diverter, a hydraulic orientator and a measurement and telemetry module located in a non-magnetic sub, connected via a cable to a ground receiving and processing complex, characterized in that between the diverter and the hydraulic the orientator installed a separate module for measuring the position of the deflector (MIPO), comprising a housing with a central flushing hole on which the electrode is located Between the insulators and electrically isolated from the housing, electrical circuits, measuring sensors, a power source and a transmitting device are located in the housing, and a receiving-processing device is introduced into the measurement and telemetry module, separated from MIPO by an electric separator and receiving electromagnetic signals from the MIPO transmitting device . 2. The device according to claim 1, characterized in that the composition of the measuring sensors of the specified module includes accelerometers. 3. The device according to claim 1, characterized in that the diverter, the specified module and the hydraulic orientator are interconnected by a quick coupling, for example, by means of a thread.

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