RU2270919C2 - Bottomhole remote sensing system information transmission method and device - Google Patents

Bottomhole remote sensing system information transmission method and device Download PDF

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Publication number
RU2270919C2
RU2270919C2 RU2004116642/03A RU2004116642A RU2270919C2 RU 2270919 C2 RU2270919 C2 RU 2270919C2 RU 2004116642/03 A RU2004116642/03 A RU 2004116642/03A RU 2004116642 A RU2004116642 A RU 2004116642A RU 2270919 C2 RU2270919 C2 RU 2270919C2
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Russia
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reference electrode
information
information transmission
connected
device
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RU2004116642/03A
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Russian (ru)
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RU2004116642A (en
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нов Эдуард Евгеньевич Лукь (RU)
Эдуард Евгеньевич Лукьянов
Виктор Николаевич Еремин (RU)
Виктор Николаевич Еремин
Константин Николаевич Каюров (RU)
Константин Николаевич Каюров
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Закрытое акционерное общество "Научно-производственное предприятие геофизической аппаратуры "ЛУЧ"
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Priority to RU2004116642/03A priority Critical patent/RU2270919C2/en
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Abstract

FIELD: well drilling, particularly means for transmitting measuring-signals from the well to the surface with the use of wireless communication line.
SUBSTANCE: method involves transmitting information in coded electric signals; receiving the coded electric signals by land-based receiving means with the use of reference electrode and transforming the coded signals. Galvanic communication line is used for the information transmission. The galvanic communication line is based on shift of natural electrochemical potential of upper drilling string part connected to electrically isolated lower one through current-conductive bus and commutation means. Land-based receiving means is high-resistance and adapted to measure the drilling string potential shift relative with regard to electrode. Voltage with changeable polarity is applied from power source to current conductive bus circuit through resistors, which limit current to be transmitted, between information transmission cycles. Time of above voltage application is set as time of the first information transmission cycle termination and time of the second information transmission cycle initiation. Device comprises electrically insulated dividing sub, which separates lower drilling string part from upper one, current-conductive bus linked in parallel to it; commutating means controlled by coded bottomhole remote sending system signal to link current-conveying bus in parallel to the sub, reference electrode and land-based receiving means. The reference electrode may be submersed in circulating drilling mud and formed as solid-state electrode or the reference electrode may be inserted in vessel filled with electrolyte electrically, linked with circulating drilling mud through electrolyte contact and porous partition. In the last case the reference electrode is made as porous pot. Land-based receiving means is made as high-resistance microvoltmeter having the first input connected to upper drilling string end and another input linked with reference electrode output. Microvoltmeter output may be connected with one input of information gathering system having output connected with computer input.
EFFECT: provision of information transmission independence and reduced power inputs necessary for information transmission.
7 cl, 2 dwg

Description

The invention relates to the field of geophysical research methods, is intended for data transmission during drilling of a well from instrumentation in the well to ground equipment, and relates to multi-parameter telemetry, in particular systems with a wireless communication channel.

A known method of transmitting information from a downhole telemetry system using an electromagnetic communication channel, implemented in a device that is a geophysical telemetry system designed to measure geophysical parameters during well drilling (A.A. Molchanov, Measurement of geophysical and technological parameters during well drilling, M .: Nedra, 1983, p. 171-177). The transmission of data from deep measurements during drilling is carried out using noise-like signals by sending powerful current pulses to the rock. As a power source for the electromagnetic method of transmitting information using an autonomous power source (electric machine generator), which is part of the drill string.

A device that implements an electromagnetic method of transmitting information contains an electric separator separating the lower part of the drill pipe string with a turbo-drill from the main part of the drill pipe string, and a key element (switch) controlled by the code signal of the downhole equipment, which connects the downhole power source (electric machine generator) to drill pipe string separated by insulator. The ground part of the system contains a ground electrode (ground electrode) and a unit for receiving encoded information (receiving device).

The disadvantages of the method and device that implements the method, is the need to place in the well as part of the drill string a large power source. The resource of such a power source is limited by the difficult conditions of its operation: high temperature, pressure and vibration at the bottom of the well. For an electric machine generator, an additional factor affecting the service life is bearing wear caused by lubricant consumption through shaft seals. This reduces the reliability and resource of the system as a whole. In addition, the placement of the power source inside the drill pipe limits its size and power, and, accordingly, the data transmission range.

The closest technical solutions to the claimed method and device for its implementation is a method of transmitting information implemented in the device according to the application No. 99105822, IPC 7 G 01 V 13/00, publ. 01/20/2001, which received a positive decision. The method of transmitting information carried out by this device is based on the closure and opening of the insulating pipe element by a key element controlled by the code signal of the downhole equipment, which leads to a change in the length of the grounding segment of the drill pipe string by connecting and disconnecting the bottom of the drill string along with the turbodrill. In this case, the grounding resistance of the drill pipe string changes and a corresponding change in the current consumption from the ground power source is recorded by the ground information receiving unit. The telemetry system also contains an insulating pipe element that separates the lower part of the drill pipe together with the turbodrill from the main string of drill pipes, a key element controlled by the code signal of the downhole equipment, a ground part containing a ground electrode and a coded information receiving unit. The difference is that a power source of electrical power for the communication channel is introduced into the ground part between the drill pipe string and the ground electrode, the key element is connected in parallel with the insulating pipe element.

But this analogue, adopted as a prototype, has the following disadvantages. The method and device that implements it, also provide for the use of a large power source. In addition, significant spreading of currents in the rocks surrounding the well has a significant effect on the sensitivity of such a telemetry system.

The present invention is aimed at solving the problem of reducing energy costs when transmitting information from downhole telemetric (inclinometric) systems, as well as from logging systems during drilling to the surface.

The essence of the invention lies in the fact that in a method of transmitting information from a downhole telemetry system, comprising transmitting information encoded by electrical signals by a transmitting device by electrical connection using a conductive bus and a switching device to the upper part of the drill string of the electrically isolated lower part of the drill string, the reception of encoded signals by ground a receiving device using a reference electrode and converting encoded signals according to the invention It is proposed that the ground-based receiving device be made high-resistance, immersed in a reference electrode in a circulating drilling fluid or placed in a container with an electrolyte, which is electrically connected to the circulating drilling fluid through an electrolytic contact and a porous septum, and use a galvanic communication channel based on a shift in the natural electrochemical to transmit information the potential of the upper part of the drill string when attaching to it the lower part of the drill string and measuring shear the drill stem relative to the reference electrode by the ground receiving device.

During breaks in the transmission of information, the voltage from the power sources is periodically supplied to the circuit of the conducting bus through resistances that limit the transmitted current, with a change in polarity.

The moments of voltage supply from power sources serve as a signal for the end of transmission of one information package and a signal for the start of transmission of another information package.

The invention also lies in the fact that in a device for implementing a method of transmitting information from a downhole telemetry system, comprising an electrically non-conductive separator-sub separating the lower part of the drill pipe string from the main drill pipe motor from the main drill pipe string, a conductive bus made connection in parallel with an electrically non-conductive splitter-sub, a switching device controlled by a downhole telemetry code signal system, for connecting a conductive bus and a ground receiving device, an additional reference electrode is introduced, immersed in a circulating drilling fluid or placed in a container with an electrolyte electrically communicating through an electrolytic contact and a porous baffle with a circulating drilling fluid, and the ground receiving device is made in the form of a high resistance microvoltmeter, one input of which is connected to the upper end of the drill string, and the other input to the output of the reference electrode.

The proposed geophysical telemetry system as a reference electrode may contain a non-polarizable electrode placed in a container with an electrolyte, which through an electrolytic contact and a porous baffle communicates with a circulating drilling fluid.

The proposed geophysical telemetry system as a reference electrode may contain a solid-state electrode immersed in a circulating drilling fluid.

The proposed geophysical telemetry system can be made in such a way that the output of the high-resistance microvoltmeter is connected to one of the inputs of the information collection system, the output of which is connected to the input of the computer.

Schemes of the proposed telemetry system using the method of transmitting information through a galvanic communication channel are shown in the drawings.

Figure 1. The general scheme of the galvanic communication channel.

Figure 2. Switching scheme of a sub-separator.

The telemetric borehole communication system with a galvanic communication channel shown in Fig. 1 includes a drill string, a lower part of the string including a bit 1, a hydraulic downhole motor 2, heavy drill pipes 3, a power container 4 with sensors, separated from the upper part of the string 5 an electrically non-conductive sub-separator 6. In parallel with the sub-separator 6, a conductive bus 8 is connected to the lower and upper parts of the sub-adapter 6 through it. A well 9 containing a drilling fluid 10, co schaetsya with a groove 11, also filled with drilling fluid 10. The standard (non-polarizable) electrode 12 is located in comparison container 13 filled with a saturated electrolyte solution. The tank 13 contains a porous septum 14 and an electrolytic contact 15. A high-resistance microvoltmeter 16 is connected between the upper part of the column 5 and a standard comparison electrode 12, the output of the microvoltmeter 16 is connected to the information collection system 17, the output of which is connected to the input of the computer 18.

The sub-separator 6, shown in detail in FIG. 2, consists of a lower 19 and an upper 20 metal conductive tips and a non-conductive dielectric insert 21 (for example, fiberglass). The lower 19 and upper 20 endings are connected by a conductive bus 8, switched by the keys K1, K2, K3, K4 of the switching device 7. The switching device 7 also contains resistances R1, R2, R3 and voltage sources U1 and U2.

The proposed method is as follows. It is known (A.S. Seryakov, L.K. Mukhin, V.Z. Luban and others, "The electrical nature of complications in wells and the fight against them", M .: Nedra, 1980, pp. 10-35) when drilling a well, the electrode potential of the tool is affected by a complex of factors, which determines high (> 1000 mV) negative potential values. The principle of operation of a telemetric system with a galvanic communication channel is based on measuring the potential difference of a galvanic cell, in which the drill pipe with its own potential is an indicator (working) electrode, and a standard (non-polarizing) electrode placed in a container with an electrolyte is used as a reference electrode, which through an electrolytic contact and a porous septum communicates with a circulating drilling fluid.

The magnitude of the current generated by this galvanic cell depends on the natural potential of the rocks, the resistance of the conductive medium, the polarization of the electrodes, and also on the length of the deflated pipes.

The drilling fluid 10 circulating in the borehole 9 enters the trough 11, forming a connecting conductive bridge between the electrodes. A container 13 located in the gutter, filled with an electrolytic solution and containing a reference electrode 12, is in contact with the drilling fluid 10 through the porous baffle 14, while the porous baffle 14 passes electric current, closing the electrolytic contact 15, but separates the electrolytic solution from the drilling fluid 10.

A non-polarizing electrode, for example, calomel or silver chloride, can be used as a reference electrode. It is also possible to use an industrial solid-state electrode immersed in a circulating drilling fluid (not shown in the figures).

The change in the potential of the column relative to the comparison electrode 12 is fixed with a microvoltmeter 16 and, after appropriate amplification, is fed to one of the inputs of the information collection system 17, which also receives signals from a depth sensor and other sensors (not shown in the figures). Comprehensive processing of the received information is carried out on a computer 18, in which the encoded downhole information is decoded and output to information carriers in physical quantities as a function of well depth and / or time.

Information on rock parameters obtained during drilling by downhole equipment sensors located in the power container 4 is encoded using an encoding device (not shown in the figures). The encoded signals are transmitted to the control input of the switching device 7, while the shunting occurs in a certain sequence of the separator-sub 6 by the conductive bus 8. Shunting leads to a stepwise change in the potential of the upper part 5 of the column by connecting and disconnecting the lower part, consisting of bit 1, of the hydraulic bottomhole engine 2, weighted drill pipe 3 and power container 4 downhole telemetry system with sensors. In the position shown in figure 2, when all the keys - K1, K2, K3, K4 - are open, the lower 19 and upper 20 of the tip of the separator-sub 6 are connected by a non-conductive dielectric insert 21. In this case, the lower and upper parts of the drill string are electrically disconnected and the potential of the drill string has a very certain level. When the keys K3 and K4 are closed, the upper and lower parts of the drill string are connected to each other through resistance K3 (about 1 Ohm), which leads to a shift in the drill string potential in the negative direction (by several millivolts).

Coding in a certain way the information obtained in the well by periodic closure - opening of keys K3-K4, transmit this information to the earth's surface.

In order to periodically remove the accumulated potentials of the column (loosening the double electric layer), the voltage sources U1 and U2 (15 V each), each of which is limited by the resistances R1 and R2 (15 Ohms) and the resistance R3, are programmed for a short time in the circuit of the conducting bus.

When the keys K1 and K3 are shorted, the source U1 is included in the bus circuit, and when the keys K2 and K3 are shorted, the source U2 is reversed.

After a cycle of 1-2 switching on of voltage sources U1 and U2 (for fractions of a second), the transmission of information by closing keys K3-K4 through an encoding device is continued according to a predetermined program.

The moments of switching on of voltage sources U1 and U2 are used as a signal about the end of transmission of one information package and the beginning of transmission of another information package.

The advantage of the proposed method and device is that for the operation of the galvanic communication channel does not require a powerful power source, because The signal from the sensors of the downhole telemetry system is transmitted not by sending powerful current pulses to the rock, but by shifting the potential of the column when the non-conductive separator of the sub is shunted by the conductive bus through the switching device.

An additional important advantage of the proposed method and device is the absence of dependence of the operation of the galvanic communication channel on the electrical properties of the section passed by the well (low resistivity of rocks, leading to current spreading, the presence of non-conductive layers in the form of salt deposits, etc.), which limit the use of the electromagnetic channel communication.

Claims (7)

1. A method of transmitting information from a downhole telemetry system, comprising transmitting information encoded by electrical signals by a transmitting device by electrically connecting, using a conductive bus and a switching device, to the top of the drill string an electrically isolated lower part of the drill string, receiving encoded signals by a ground receiving device using a reference electrode and converting the encoded signals, characterized in that the ground receiving device is performed in high-resistance, the reference electrode is immersed in a circulating drilling fluid or placed in a container with an electrolyte, which is electrically connected to the circulating drilling fluid through an electrolytic contact and a porous septum, and a galvanic communication channel based on the shift of the natural electrochemical potential of the upper part of the drill string is used to transmit information attaching to it the bottom of the drill string and measuring the shift of the potential of the drill string relative to the reference electrode ground receiver.
2. The method according to claim 1, characterized in that during breaks in the transmission of information periodically, voltage is supplied to the circuit of the conductive bus from power sources through resistances that limit the transmitted current, with a change in polarity.
3. The method according to claim 2, characterized in that the moments of voltage supply from power sources serve as a signal for the end of transmission of one information package and a signal for starting transmission of another information package.
4. A device for implementing a method of transmitting information from a downhole telemetry system, comprising an electrically non-conductive separator-sub separating the bottom of the drill pipe string along with a hydraulic downhole motor from the main drill pipe string, a conductive bus configured to be connected in parallel with an electrically non-conductive splitter-sub , a switching device controlled by a code signal of a downhole telemetry system for connecting a conductive bus and a ground A receiving device, characterized in that it further comprises a reference electrode immersed in a circulating drilling fluid or placed in a container with an electrolyte electrically communicating through an electrolytic contact and a porous baffle with a circulating drilling fluid, and the ground receiving device is made in the form of a high-resistance microvoltmeter, one the input of which is connected to the upper end of the drill string, and the other input to the output of the reference electrode.
5. The device according to claim 4, characterized in that the reference electrode comprises a non-polarizable electrode, placed in a container with an electrolyte, which is in communication with a circulating drilling fluid through an electrolytic contact and a porous baffle.
6. The device according to claim 4, characterized in that as the reference electrode contains a solid-state electrode immersed in a circulating drilling fluid.
7. The device according to any one of claims 4 to 6, characterized in that the output of the microvoltmeter is connected to one of the inputs of the information collection system, the output of which is connected to the input of the computer.
RU2004116642/03A 2004-05-20 2004-05-20 Bottomhole remote sensing system information transmission method and device RU2270919C2 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2449120C2 (en) * 2006-12-28 2012-04-27 Шлюмбергер Текнолоджи Б.В. Complex instrument for specific resistance electrode measuring and electro-magnetic distant measuring
RU2480582C1 (en) * 2011-09-19 2013-04-27 Общество с ограниченной ответственностью Научно-производственная фирма "ГОРИЗОНТ" (ООО НПФ "ГОРИЗОНТ") Method to transfer information from well along electromagnetic communication channel and device for its realisation
RU2613374C2 (en) * 2008-03-03 2017-03-16 Интеллизерв Интернэшнл Холдинг, Лтд Monitoring borehole indexes by means of measuring system distributed along drill string
RU2696954C1 (en) * 2018-04-02 2019-08-07 Государственное бюджетное образовательное учреждение высшего образования "Альметьевский государственный нефтяной институт" Device for transmitting information over an electromagnetic communication channel during operation of wells
RU2706046C2 (en) * 2015-03-09 2019-11-13 Дженерал Электрик Компани Drilling process and device

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ГРАЧЕВ Ю.В. и др. Автоматический контроль в скважинах при бурении и эксплуатации. М.: Недра, 1968, с.271-281. *
МОЛЧАНОВ А.А. Измерение геофизических и технологических параметров в процессе бурения скважин. М.: Недра, 1983, с. 31-38, 171-177. *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2449120C2 (en) * 2006-12-28 2012-04-27 Шлюмбергер Текнолоджи Б.В. Complex instrument for specific resistance electrode measuring and electro-magnetic distant measuring
RU2613374C2 (en) * 2008-03-03 2017-03-16 Интеллизерв Интернэшнл Холдинг, Лтд Monitoring borehole indexes by means of measuring system distributed along drill string
RU2480582C1 (en) * 2011-09-19 2013-04-27 Общество с ограниченной ответственностью Научно-производственная фирма "ГОРИЗОНТ" (ООО НПФ "ГОРИЗОНТ") Method to transfer information from well along electromagnetic communication channel and device for its realisation
RU2706046C2 (en) * 2015-03-09 2019-11-13 Дженерал Электрик Компани Drilling process and device
RU2696954C1 (en) * 2018-04-02 2019-08-07 Государственное бюджетное образовательное учреждение высшего образования "Альметьевский государственный нефтяной институт" Device for transmitting information over an electromagnetic communication channel during operation of wells

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Effective date: 20120521