RU2702790C1 - Device for orientation of direction of offshoots sidetracking from horizontal part of uncased well - Google Patents

Abstract

FIELD: mining.SUBSTANCE: invention relates to means orientation of direction of offshoots sidetracking from open-well horizontal part. Proposed device for orientation of direction of sidetracking from open-well horizontal part contains bottom-hole telemetric system – BTS – with wireless electromagnetic communication channel, lowered in the well on the pipe string, including sensor control module, transmitting module, as well as a receiving device and a personal computer located at the wellhead. Besides, device in direction from BTS to pipe string is successively equipped with spiral drill collar (DC), wedge-deflector with inclined working surface with angle of 4–6° with respect to the axis of the horizontal part of the uncased well, with a safe sub, wherein the ratio of the outer diameter of the spiral DC to the diameter of the horizontal wellbore is 0.9:1, and the outer diameters of the wedge and spiral DC are equal to each other. Device are placed in the range of the greatest set of curvature, but not more than 6° per 10 m.EFFECT: disclosed device for orientation of direction of sidetracking from horizontal part of open well allows to: increase accuracy of orientation direction of cutting working surface of wedge-deflector relative to azimuth of horizontal part of uncased well; reducing the probability of attachment clamping in the horizontal part of the well when drilling the offshoot; to extract pipe string by flap with sticking BTS; reduce metal consumption and weight of BTS structure.1 cl, 3 dwg

Description

The invention relates to field geophysics, and in particular to means for transmitting measurement signals from a well to a day surface in order to orient the direction of sidetracking from the horizontal part of an open hole.

A device is known for orienting the direction of sidetracking from the horizontal part of an uncased borehole, including a downhole telemetry system (ZTS), lowered into the borehole on a pipe string and containing interconnected pulsator-generator module, inclinometer module, gamma-ray logging module, including telemetric blocks, the downhole telemetry system further comprises an analysis and control unit for the switch and a switch connected to said modules, wherein the input of the analysis unit for and controlling the switch is connected to the output of the pulsation control unit of the gamma-ray log module installed in the gamma-ray module and the first input of the switch, and the output of the analysis and control unit of the switch is connected to the control input of the switch, the second input of the switch is connected to the output of the pulsation control unit inclinometer installed in the inclinometer module, and the output of the switch is connected to the input of the pulsator installed in the module of the generator-pulsator (patent RU No. 2509210, IPC ЕВВ 47/12, publ. 03/10/2014 in bull. No. 7).

The disadvantages of this device are:

- firstly, the design complexity associated with the fact that the device further comprises a switch analysis and control unit and a switch connected to said modules, wherein the input of the switch analysis and control unit is connected to the output of the pulsation control unit of the gamma-ray logging module installed in gamma ray logging module;

- secondly, the low accuracy of the orientation direction of the notch of the working surface of the diverter wedge relative to the azimuth of the horizontal part of the uncased borehole due to the low rigidity of the structure and the lack of centering of the ZTS relative to the axis of the horizontal well, i.e. the horizontal axis of the TSZ is shifted down relative to the horizontal axis of the well. As a result, the signal transmitted from the downhole telemetry system sensors to the receiving device (via the electromagnetic communication channel) located at the wellhead is distorted;

- thirdly, a high probability of an STZ sticking in the horizontal part of an open hole while drilling a sidetrack. This is due to the fact that during the drilling of the sidetrack, the sludge resulting from the drilling of the rock is carried out from the sidetrack to the horizontal part of the uncased borehole, and as a result of the absorption of the flushing fluid during the drilling of the sidetrack, there is no fluid circulation at the wellhead and the entire cuttings settles in the horizontal part of the open hole in the layout interval;

- fourthly, the impossibility of extracting the pipe string from the horizontal part of the uncased borehole while seizing the ZTS;

- fifthly, high metal consumption and weight of the ZTS design, which is associated with a large number of modules in the device.

The closest in technical essence is a device for orienting the direction of sidetracking from the horizontal part of an open hole,

including a downhole telemetry system - ZTS - with a wireless electromagnetic communication channel, lowered into the well on a pipe string and containing a control module in the form of sensors, a transmitting module, as well as a receiving device and a personal computer located at the wellhead. The device also contains an electric separator, measuring modules and a turbogenerator, including a hydraulic turbine and an electric generator, as well as a contactless transmission unit of rotation from the hydraulic turbine shaft to the shaft of the electric generator, made in the form of a magnetic coupling, while the transmitting module includes an inverter in the form of a bridge circuit with keys, moreover, the shoulders of the bridge circuit of the inverter are connected to the signal winding of the electric generator through a current rectifier, and the diagonal of the bridge is connected to the electrodes of the electric I, the output of the personal computer is connected to the keys of the inverter, and the input to the signal winding of the electric generator through the circuit for determining the transitions of the sinusoidal voltage on the signal winding through “zero”, the keys of the inverter are included in the bridge circuit with the possibility of generating a short-circuited electric circuit with the signal winding by command personal computer installed on the wellhead (patent RU No. 2383730, IPC ЕВВ 47/12, publ. 03/10/2010 in bull. No. 7).

The disadvantages of this device are:

- firstly, the low accuracy of the orientation direction of the notch of the working surface of the deflector wedge relative to the azimuth of the horizontal part of the open hole due to the low rigidity of the ZTS design. As a result, the signal transmitted from the downhole telemetry system sensors to the receiving device (via the electromagnetic communication channel) located at the wellhead is distorted. In addition, in the case of sidetracking from the horizontal part of an open hole due to the lack of centering of the TSZ relative to the horizontal axis, the risk of damage to the TSZ itself increases due to the fact that during drilling the sidetrack crosses the horizontal part of the open-hole well in the interval of finding the TSZ;

- secondly, a high likelihood of an STZ sticking in the horizontal part of an open hole while drilling a sidetrack. This is due to the fact that during the drilling of the sidetrack, the sludge resulting from the drilling of the rock is carried out from the sidetrack into the horizontal part of the uncased borehole, while as a result of the absorption of the flushing fluid during the drilling of the sidetrack, there is no fluid circulation at the wellhead, and all the sludge settles in the horizontal part of the open hole in the interval placement layout.

- thirdly, the impossibility of extracting the pipe string from the horizontal part of the uncased borehole while seizing the ZTS;

- fourthly, high metal consumption and weight of the ZTS design. This is due to the fact that an electric generator in the form of a magnetic coupling is used to power the ZTS.

The technical objectives of the invention are to increase the accuracy of orientation of the direction of cutting the working surface of the diverter wedge relative to the azimuth of the horizontal part of the uncased borehole, to reduce the likelihood of sticking the assembly in the horizontal part of the well when drilling a sidetrack with the possibility of retrieving the string of pipes with a collar in case of seizure of the ZTS, as well as reducing metal consumption and weight ZTS designs.

The stated technical problems are solved by a device for orienting the direction of sidetracking from the horizontal part of an open-hole well, comprising a downhole telemetry system - a ZTS with a wireless electromagnetic communication channel, lowered into the well on a pipe string, including a control module in the form of sensors, a transmitting module, and also a receiving device and a personal computer located at the wellhead.

New is that the device in the direction from the ZTS to the pipe string is sequentially equipped with a spiral weighted drill pipe - drill collar, diverter wedge with an inclined working surface with an angle of 4–6 ° relative to the axis of the horizontal part of the uncased borehole, and a safe sub the interval of the largest set of curvature of the device is placed no more than 6 ° per 10 m, and the ratio of the outer diameter of the spiral drill collar to the diameter of the horizontal wellbore is 0.9: 1, and the outer diameters of the deflector wedge and WASHING collars are equal.

In FIG. 1 and 2 schematically and sequentially depict the proposed device in the process.

In FIG. 3 schematically in section AA shows the proposed device, oriented in azimuth.

A device for orienting the direction of sidetracking from the horizontal part of an open hole contains a deflated 1

 (Fig. 1) on the pipe string 2 downhole telemetry system 3, for example, ZTS-54 brand with a wireless electromagnetic communication channel, which includes a control module 4 in the form of sensors (shown in Figs. 1–3 conventionally) and a transmitting module 5 ( Fig. 1), as well as the receiving device 6 and the personal computer 7. The receiving device 6 and the personal computer 7 are located at the wellhead 1.

The device in the direction from the ZTS 3 to the pipe string 2 is sequentially equipped with a spiral drill collar 8, a deflector wedge 9 with an inclined working surface 10 and a safe sub 11. It has been experimentally established that the angle of inclination of the working surface 10 of the deflector 9 to the horizontal axis of the uncased well -

1 1 is 4–6 ° depending on the size of the pipe string 2 and the outer diameter of the wedge of the deflector 9. UBT 8 is connected using a threaded connection.

For accurate centering of the device during sidetracking from the horizontal part of an uncased borehole with a diameter of D _c (Fig. 2), the outer diameter D _{of a} spiral drill collar is 0.9 of the diameter of a horizontal wellbore D _c , and the outer diameters D _{of a} spiral drill pipe and a whipstock D _to are equal to each other. i.e.: D _y = 0.9⋅D _s ; D _y = D _to . The length of the drill collar should provide centering of the device in a horizontal well. In order to more intensively remove the bottom face of the created side channel from the horizontal part of the open hole, the device must be placed in the interval of the largest set of curvature, but not more than 6 ° per 10 m.

Thus, if D _s = 142 mm, then the diameter D _y = 0.9⋅D _s = 0.9⋅142 mm = 127 mm;

D _y = D _to = 127 mm

The proposed device operates as follows.

At the wellhead 1, at the end of the pipe string 2 (Fig. 1), a ZTS 3, a spiral drill collar 8, a wedge diverter 9 with an inclined working surface 10, a safe sub 11 are successively mounted from bottom to top in order to more intensively remove the side channel from the horizontal part of open-hole well 1, the proposed device must be placed in the interval of the largest set of curvature, but not more than 6 ° per 10 m. Therefore, in view of the foregoing, the proposed device is launched into the interval of sidetracking with the largest m dial horizontal portion uncased borehole curvature 1, for example, 5 ° to 10 m.

 Then proceed to the orientation of the inclined working surface 10 of the wedge diverter 9 in azimuth (apsidal plane) (Fig. 2 and 3). For example, the inclined working surface 10 of the whipstock 9 (Fig. 1) along the axis to the horizontal part of the inclined well 1 has an angle α = 4 °.

Orientation of the working surface 10 of the diverter wedge 9 in the apsidal plane along the ZTS is carried out with the participation of the geophysical lot.

From the wellhead 1, with the help of pipe wrenches, the pipe string 2 and, accordingly, the entire arrangement located at the end of the pipe string 2 are rotated to the right with pacing and holding until the planned rotation angle is reached, for example, 130 ° (Fig. 3), which determines on reaching the signal at the wellhead 1.

 For example, at the mouth of the well 1 and the upper pipe, the string of pipes 2 carry out chalk marks every 10 °. Then each time the pipe string 2 is rotated by 10 °, the pipe string 2 is paced: up 5 m, down 10 m and again up 5 m, after which exposure is carried out for 5 minutes. In the absence of a signal reaching the wellhead 1, the above operations are repeated stepwise as many times as necessary until the signal reaches the wellhead, i.e. until the planned angle of rotation of 130 ° is reached.

In this case, each time the information from the sensors of the control module 4 (Fig. 2) installed in the ZTS 3 housing, through the transmitting module 5, is converted into a code sequence depending on the measurement of angular parameters that change when the pipe string 2 is turned to the right from the wellhead 1.

At the end of work in the direction of orientation, sidetracking is performed through the deflector 9 using a flexible pipe, a downhole screw motor and a bit, while the proposed device continues to be in the well until the completion of sidetracking work. At the end of the execution of the sidetrack, the proposed device is moved to a different interval of sidetracking in the horizontal part of the open hole 1 or removed at the wellhead 1.

 The transmitting module 5 sends a signal through an electromagnetic communication channel to a receiving device 6 located at the wellhead. At the receiving device 6, the received signal is decoded and input to the personal computer 7 for processing. The program processes all the information received from the sensors of the control module 4 when turning the pipe string 2 at the wellhead, for presentation initially in digital form, and then for visualization in the form of tables, graphs and diagrams on the monitor screen of a personal computer 7 and the signal from the sensors of the module control 4 through the transmitting module 5 to the receiving device 6 located at the wellhead 1 and, accordingly, achieving the planned angle of rotation, for example 130 ° (Fig. 3), i.e. the direction of the working surface 10 of the whipstock 9 from the horizontal part of the uncased borehole 1 for sidetracking (not shown in Figs. 1-3).

Orientation of the deflecting wedge 9 must be carried out in such a way that the created channel during drilling does not cross the horizontal part of the uncased borehole 1, i.e. when the azimuth decreases (from 0 ° to 180 °) of the open trunk, the channel bore must be planned to the right and the deflector wedge 9 should be oriented to the right, when the azimuth (from 180 ° to 360 °) increases, the channel bore must be planned to the left and the deflector wedge 9 should be oriented to the left.

UBT 8 is used as part of the device in order to increase the rigidity of the device structure, and also as a centralizer, which generally improves the accuracy of the tilt angle when orienting the working surface of the deflecting wedge 8 in azimuth relative to the horizontal part of the uncased borehole 1. Damage to the ZTS itself is also eliminated high-quality centering of the proposed device in the horizontal part of the uncased borehole, therefore, in the process of drilling the sidetrack does not intersect the horizontal part of felled well in the interval of the location of the ZTS.

The use of UBT 8 in the form of a spiral reduces the likelihood of a stuck assembly in the horizontal part of an open hole when drilling a sidetrack, since the presence of spiral grooves reduces the contact area of the wall of the well and the pipe, thereby reducing the likelihood of stuck pipes, thereby reducing the likelihood of sticking by a factor of 2–3 ZTS in comparison with the prototype.

If the device is stuck in the well 1, a safe sub 11 is activated. For example, for this, the pipe string 2 is rotated from the wellhead 1. As a result, the pipe string 2 is turned away from the diverting wedge 9. The pipe string 2 is removed from the well 1. Then, into the well 1, any known fishing tool with an internal grip is lowered onto the pipe string, for example, an internal tube (not shown in FIGS. 1-3). Make capture of the inner tube for the inner surface of the wedge-deflector 9 (Fig. 3) and remove the remaining part (ZTS 3, spiral drill collar 8, wedge-deflector 5) of the proposed device at the wellhead.

 In the proposed device for electronic components of the ZTS (control module 4 and transmitting module 5), battery power 12 (batteries) is used, which allows measurement of angular parameters (0 ° –360 °), i.e. the direction of the working surface of the diverter wedge in azimuth relative to the horizontal part of the open hole).

In the proposed design of the device, the role of the electric generator is performed by the battery power 12, therefore, the absence of the electric generator in the form of a ZTS 3 in the form of a magnetic coupling reduces the metal consumption and the weight of the structure.

The proposed device for orienting the direction of sidetracking from the horizontal part of an open hole allows you to:

- to increase the accuracy of orientation of the direction of the notch of the working surface of the deflector wedge relative to the azimuth the horizontal part of the open hole;

- reduce the likelihood of sticking the layout in the horizontal part of the well when drilling a sidetrack;

- remove the pipe string with a lapel when grabbing the ZTS;

- reduce metal consumption and weight of the ZTS design.

Claims (1)

A device for orienting the direction of sidetracking from the horizontal part of an open-hole well containing a downhole telemetry system lowered into a well on a pipe string — ZTS — with a wireless electromagnetic communication channel, including a control module in the form of sensors, a transmitting module, and a receiving device and a personal a computer located at the wellhead, characterized in that the device in the direction from the ZTS to the pipe string is sequentially equipped with a spiral weighted drill pipe d - drill collar, wedge-diverter with an inclined working surface with an angle of 4-6 ° relative to the axis of the horizontal part of the uncased borehole, a safe sub, while the device is placed in the interval of the largest set of curvature not more than 6 ° per 10 m, and the ratio of the outer diameter spiral UBT to the diameter of the horizontal wellbore is 0.9: 1, and the outer diameters of the whipstock and spiral UBT are equal to each other.

Images