Method and system for transfer of data on well shaft

FIELD: oil and gas industry.

SUBSTANCE: method involves three stages: acquisition and processing of borehole data, sending and transfer of signals, and acquisition of data on the surface. Into a drilling string there can be installed a relay system for recovery of signals. By means of a connecting element between a piezoelectric converter and a drilling pipe and by means of transfer ability of wave of stresses of the drilling string, by detection there automatically chosen is an optimum frequency and used for transfer of signals to the surface through the drilling string. In order to transfer signals, detection of a chaos generator is used, as well as in order to solve a Duffing equation, Runge-Kutta method of the fourth order is used to determine availability of a signal as per the value of the system period, and then, a useful signal is picked up. The system comprises a system for the well data receiving and sending, and a system for data acquisition on surface, as well as it can include a relay system. Signals can be transferred in two directions.

EFFECT: invention can be widely used at drilling using liquid or gaseous fluids; its advantage comprises high data transfer and detection rate.

8 cl, 2 dwg

 

The SCOPE of the INVENTION

[0001] This invention relates to the field of oil production, in particular to a method and system for data transmission of the wellbore.

The LEVEL of TECHNOLOGY

[0002] in recent years, the technology of drilling with reduced hydrostatic pressure in the wellbore has been a significant development in its area of application. However, many installations for drilling under reduced hydrostatic pressure in the wellbore do not reach expected performance, the main reason why is that during the entire drilling process is not supported by the reduced hydrostatic pressure, causing damage to the earth's surface and other difficult situations. Therefore, the advantages of drilling with reduced hydrostatic pressure in the wellbore when the detection and protection of the oil reservoir, the solution of special tasks and reduce costs may not be received in full. It is therefore important to control downhole data during the drilling process at low hydrostatic pressure in the wellbore to provide drilling under reduced hydrostatic pressure around the wellbore. When this data transmission technology of the wellbore becomes the primary control technology in real time.

[0003] currently, as the wire is one unit of data collection and processing drilling uses MWD (measurement while drilling), which is used for horizontal or deviated wells. This device transmits downhole data to the surface by correcting the deviation of the fluid pressure of the drilling shaft in the drill string and using the signal of the pressure pulse. However, there are the following difficulties.

(1) This device may only be used in wells with fluid only in the liquid state and may not be used in gas wells or wells with fluid in the mixed gaseous and liquid state, since the compressibility of the gas determines its inability to transmit data using the pulse pressure.

(2) the data transmission Speed is relatively low, only 0.5-3 bits/s

SUMMARY of the INVENTION

[0004] the Purpose of this invention is to provide a method and system for data transmission of the wellbore. In this method using the connecting element between the piezoelectric transducer and the drill pipe and through the transmitting ability of the wave voltages of the drill string downhole data in real time is transmitted to the surface using a device for transmitting and receiving wave voltages of the drill string, resulting in a data rate increases, while the liquid medium borehole at it no longer.

[005] To achieve the above objectives, the invention proposes a method for data transmission of the wellbore, wherein the media data is selected wave voltages, and the data transmission channel is taken drillstring. This method consists of three stages: acquisition and processing of borehole data, sending and transmitting and receiving data on the surface, namely:

(a) receipt and processing of borehole data, wherein the data collection module, located on the drill string, receives the analog signal, including borehole data, the analog signal is converted into a digital signal through the analog-to-digital conversion A/D, digital signal enters the module signal processing DSP, which encodes the digital signal by a predetermined encoding format, then created and encoded digital signal;

b) sending and transmitting signals, wherein the encoded digital signal is converted into an analog signal through the d / a conversion D/A, and then the analog signal is sent to the module sending data to gain, then the amplified signal is transmitted to the piezoelectric transducer to launch a piezoelectric transducer, piezoelectric transducer converts the amplified analog signal into a frequency signal wave voltages, characterized in that hour the OTA transmission wave voltage is selected within the bandwidth of the drill string and can be adjusted automatically according to different combinations and the length of the drill string, the signal wave frequency voltage is transmitted to the surface through a drill string; and

C) obtaining data on the surface, characterized in that the module is receiving data that is installed on the pipe drill pipe, receives the frequency signal wave voltage transmitted to the surface, the wireless relay forwards the signal frequency wave stresses in the surface receiving device, the signal wave frequency voltage is converted into a digital signal through the analog-to-digital conversion A/D, the digital signal is sent to ground-based computer, the surface computer selects from the digital signal, the useful signal is weak, hidden among the strongest interference, and decodes the useful signal is weak.

[0006] In the process of sending and signal transmission, if the transmitting zone of the well is long and there is a loss of signal in the drill string can be set relay system, characterized in that the module is receiving data in a relay system receives the analog signal, including well data from wells, converts the analog signal into a digital signal through the analog-to-digital conversion A/D and transmits the digital signal to the data processing module, data processing module identifies and restores the useful signal is weak, hidden among with the selected interference, and receives the recovered digital signal, the recovered digital signal is converted to an analog signal using the D/A and transmitted to the data transmission module, the analog signal is amplified to run the piezoelectric transducer, piezoelectric transducer converts the amplified analog signal into a frequency signal wave voltages, the signal wave frequency voltages sequentially transmitted to the surface through the drill string.

[0007] moreover, according to this method for sending and signal transmission frequency is selected within the bandwidth of the drill string, as the transmission wave voltage through the drill string will show the properties of the filter with comb-like frequency spectrum, in which the bandwidth and band attenuation alternate. According to this method of signal transmission in the passband is effective while in the band, the attenuation is a significant signal suppression and its effective transfer is impossible.

[0008] the DSP encodes the digital signal into an encoding format "synchronous signal + signal data. Each full block of the digital signal includes 8 data bits, where 1 bit corresponds to the synchronous signal, and 7 bits correspond to the information signal. Simultaneous with the persecuted, designed for encoding DSP, is a linear signal with frequency modulation. Identifies the bandwidth and band attenuation of the drill string, the bandwidth is determined according to the frequency of the wave equation stresses the drill string, and the frequency with the best effect of the pass bandwidth is automatically selected as a frequency for transmitting signals to the drill columns in various designs and lengths. The frequency equation of wave voltages of the drill string in the following form:

In the above equation:

d1: length of the drill string (the middle part);

d2: link length (the sum of the two compounds);

c1: wave speed drill pipe;

c2: wave speed in the connection;

k=ω/z;

z=z1+z2;

z1=a1·ρ·c0;

z2=a2·ρ·c0;

ω=2π·f;

d=d1+d2;

a1: the cross-sectional area of the drill pipe;

and2: the cross-sectional area of the connection;

with0: the speed of sound in steel.

ρ: the density of steel;

f: frequency.

[0009] In the process of signal transmission from the well there is a large interference from the field. In order to identify the useful signal is weak, hidden among the strong p the fur, to extract the desired signal is weak from the strong background noise is used for detection of the generator of chaos. For the detection of chaos generator applies the following equation Duffing:

In the above equation, γ is the driving force, µAndAcos(ωt) - adopted by the useful signal is weak, ZS- interference

t - time

k is explained by the following formula:

k=ω/z,

where, in turn, ω=2π·f, while f is the frequency,

a z=z1+z2where z1and z2in turn, explained by the following:

z1=and1·ρ·c0and z2=and2·ρ·c0,

whereand1- the cross-sectional area of the drill pipe;

a2- the cross-sectional area of the connection;

with0- the speed of sound in steel.

ρ is the density of steel.

[0010] the Driving force γ is adjusted so that the system is in a critical state has moved from a period of chaos for a large period. The input is the signal containing noise, the detection of which you want to perform. If the system goes from a period of chaos for a large period, this means that the input signal is composed of signal you want to detect, thus solving the above equation uses a method of Runge-Kutta fourth order to calculate the period of the system and the new who report the presence of a signal. Signal-to-noise ratio, which can be determined using conventional detection is -10 dB, whereas in this invention it may be less than -40 dB. This means that when the interference power that exceeds the signal strength of 10,000 times, the system still can effectively detect the useful signal is weak.

[0011] a System for obtaining data on the surface and the system of receiving and sending data in the borehole can communicate in two directions. The system of sending and receiving data in the borehole down into the borehole with the drill bit for drilling. When you start drilling, the system of obtaining data on the surface transmits a linear signal with frequency modulation in the system of sending and receiving data in the well. Linear signal with frequency modulation is passed down to the system of receiving and sending data in the borehole on the drill pipe. After receiving a line signal with frequency modulation system of receiving and sending data in the well first calculates the optimum transmission frequency, and then receives the data transmitted from the data collection device in the well. When the drilling stops, the system of obtaining data on the surface transmits a signal indicating the termination receive data. When the system is receiving and sending data in the well receives this signal, receiving from vaginyh data is terminated.

[0012] the Above system for collecting downhole data may be a data acquisition system in a conventional device that performs measurement while drilling, as well as useful model "the Device for collecting and transmitting downhole data according to the application No. 2008200063778 Keramische research Institute drilling company Western Drilling or other data collection devices in the well.

To achieve the above objectives the present invention also provides a system for transmitting data about the bore, which includes a system for receiving and sending data in the borehole and obtaining data on the surface, characterized in that:

a) a system of receiving and sending data in the borehole comprises a module for collecting downhole data module analog-to-digital signal conversion A/D module, the signal processing DSP module digital to analog signal conversion D/A and a data transmission module, characterized in that:

module collecting downhole data collects borehole data and outputs the analog signal;

module analog-to-digital signal conversion A/D converts the analog signal into a digital signal and supplies the digital signal to the signal processor DSP;

the signal processor DSP encodes the digital signal and outputs the encoded digital signal;

module d / a conversion signal D/A converts the encoded digital signal into an analog signal;

module sending data is composed of the power amplifier and piezoelectric transducer, characterized in that:

the power amplifier amplifies the analog signal converted by the module to analog conversion signal D/A;

the piezoelectric transducer converts the amplified analog signal into a frequency signal wave voltages and transmits the signal wave frequency voltage to the surface through a drill string; and

b) a system for obtaining data on the surface is composed of the module receiving data installed on the pipe drill pipe, wireless repeater, terrestrial receiver module analog-to-digital signal conversion A/D and ground computer, characterized in that:

the module receiving data receives the frequency signal wave voltage transmitted to the surface and sends a signal frequency wave voltage into a wireless repeater;

wireless relay forwards the signal frequency wave stresses in the surface receiving device;

module analog-to-digital signal conversion A/D converts the signal frequency wave voltage into a digital signal and supplies the digital signal to nasenyana;

ground the computer identifies useful weak signal from a digital signal and decodes the useful signal is weak.

System for data transmission of the wellbore also incorporates a relay system, which is located between the system receiving and sending data in the borehole and obtaining data on the surface, characterized in that the relay system is composed of the module receiving data module analog-to-digital signal conversion A/D module, data processing module digital to analog signal conversion D/A module send data and power module, characterized in that:

the module receiving data receives an analog signal;

module analog-to-digital signal conversion A/D converts the analog signal into a digital signal;

the data processing module recovers the digital signal and sends the restored digital signal to the module to analog conversion signal D/A;

module d / a conversion signal D/A converts the recovered digital signal into an analog signal and transmits the analog signal to the module sending data;

module sending data is composed of the power amplifier and piezoelectric transducer, characterized in that:

the power amplifier amplifies the analog signal received module digital to analog signal conversion D/A;

the piezoelectric transducer converts the amplified signal into a signal of a frequency wave voltage and transmits the signal wave frequency voltage to the surface through a drill string; and

the power module supplies power to an integrated circuit of the relay system.

[0013] Advantages of the present invention

This invention can be widely applied when drilling with the use of liquid or gaseous fluids; and

high speed data transfer and data discovery, for example, the transmission rate is greater than 100 bits/s

BRIEF DESCRIPTION of DRAWINGS

(0014] figure 1 presents a block diagram depicting a data transfer process of the wellbore according to the variant embodiment of the invention; and

[0015] figure 2 presents a schematic diagram showing the detection of the chaotic state according to the variant embodiment of the invention.

DETAILED DESCRIPTION of PREFERRED embodiments of the INVENTION

[0016] a Variant embodiment of the invention is described in detail with reference to the relevant drawings.

[0017] figure 1 presents a block diagram depicting a data transfer process of the wellbore according to the variant embodiment of the invention. According to the method presented in figure 1, there are three stages of data about the wellbore, including the following: received the e and processing of borehole data, sending and sending signals to and receiving data on the surface. These three stages will be described in detail.

[0018] A. Receiving and handling well data: Well data collected by the data collection system devices MWD on drill pipe (as well as a useful model "the Device for collecting and transmitting downhole data according to the application No. 2008200063778 Keramische research Institute drilling company Western Drilling or other data collection devices in the well), is converted from an analog signal into a digital signal through the analog-to-digital conversion A/D, and then the digital signal is fed to the signal processor DSP, which encodes the digital signal in the format of a synchronous signal + signal data". A complete unit of a digital signal is composed of 8 data bits, in which 1 bit corresponds to the synchronous signal, and 7 bits correspond to the information signal. In particular, the signal processor DSP performs encoding in accordance with the following encoding format.

[0019] In the serial data transmission system must be synchronous signal. The signals are transmitted sequentially, bit by bit, and group by group. Each full block of the digital signal is composed of 8 data bits. In this case, synchronous signalled linear signal with frequency modulation, which is the first bit of the eight. The last 7 bits correspond to the digital signal. As shown in figure 2, the value "1" in the digital signal indicates the preferred frequency, if the value is "0", the signal is not transmitted.

[0020] the Synchronous signal for encoding DSP is a linear signal with frequency modulation. Identifies the bandwidth and band attenuation of the drill string, the bandwidth is determined according to the frequency of the wave equation stresses the drill string, and the frequency with the best effect of the pass bandwidth is automatically selected as a frequency for transmitting signals to the drill columns in various designs and lengths. The frequency equation of wave voltages of the drill string in the following form:

where

d1: length of the drill string (the middle part);

d2: link length (the sum of the two compounds);

with1: wave speed drill pipe;

c2: wave speed in the connection;

k=ω/z;

z=z1+z2;

z1=a1·ρ·c0;

z2=a2·ρ·c0;

ω=2π·f;

d=d1+d2;

a1: the cross-sectional area of the drill pipe;

and2: the cross-sectional area of the connection;

with0: the speed of sound in the article is whether;

ρ: the density of steel;

f: frequency.

[0021] C. Sending and signal transmission. The digital signal is encoded in the DSP is converted into an analog signal through the d / a conversion signal D/A, and then the analog signal is passed to the module sending data to gain, then the amplified signal is used to start the piezoelectric transducer. The piezoelectric transducer converts the amplified signal into a signal of a frequency wave voltage. The frequency of the transmission wave voltage is selected within the bandwidth of the drill string, and can be adjusted automatically depending on different combinations of drill string and its length. The signal wave frequency voltage is transmitted to the surface through the drill string.

[0022] C. Obtaining data on the surface. The system of obtaining data that is installed on the pipe drill pipe, receives the frequency signal wave voltage transmitted to the surface, and the wireless relay forwards the signal frequency wave stresses in the surface receiving device, the signal wave frequency voltage is converted into a digital signal through the a / d conversion A/D, the digital signal is sent to the ground computer. Ground computer (5) identify useful signal is weak, hidden is among the strong interference from a digital signal, and decodes the useful signal is weak.

[0023] In the process of sending and signal transmission, if the transmitting area of the borehole is long and there is attenuation of the signal in the drill string can be set relay system (3). The module receiving data in a relay system (3) receives the analog signal, including well data from wells, converts the analog signal into a digital signal through the analog-to-digital conversion A/D and transmits the digital signal to the data processing extension. The data processing module identifies and restores the useful signal is weak, hidden among the strongest interference, and receives the recovered digital signal. The recovered digital signal is converted into an analog signal through the d / a conversion signal D/A, is transmitted in the data transmission module, the analog signal is amplified to run the piezoelectric transducer. The piezoelectric transducer converts the amplified analog signal into a frequency signal wave voltages, the signal wave frequency voltages sequentially transferred to the surface.

[0024] In the process of signal transmission from the well there is a large interference from the field. In order to identify the useful signal is weak, hidden among the strongest interference to extract useful the th signal is weak from the strong background noise is used for detection of the generator of chaos. For the detection of chaos generator uses the following equation Duffing:

In the above equation, γ is the driving force, µAAcos(ωt) - adopted by the useful signal is weak, and ZS- interference

t - time

k is explained by the following formula:

k=ω/z,

where, in turn, ω=2π·f, while f is the frequency,

a z=z1+z2where z1and z2in turn, explained by the following:

z1=and1·ρ·c0and z2=and2·ρ·c0,

whereand1- the cross-sectional area of the drill pipe;

a2- the cross-sectional area of the connection;

with0- the speed of sound in steel.

ρ is the density of steel,

[0025] the Driving force γ is adjusted so that the system is in a critical state has moved from a period of chaos for a large period. The input is the signal containing noise, the detection of which you want to perform. If the system goes from a period of chaos for a large period, this means that the input signal is composed of signal you want to detect, thus solving the above equation uses a method of Runge-Kutta fourth order to calculate the period of the system and to detect the presence of a signal.

[0026] a System for obtaining data on the surface (4) and the floor system is to be placed and sending data in the borehole (2) can communicate in two directions. The system of sending and receiving data in the borehole (2) is lowered into the well together with a drill for drilling. When you start drilling, the system of obtaining data on the surface (4) transmits a linear signal with frequency modulation in the system of sending and receiving data in the borehole (2) for obtaining downhole data. Linear signal with frequency modulation is passed down to the system of receiving and sending data in the borehole (2) drill pipe. After receiving a line signal with frequency modulation system of receiving and sending data in the borehole (2) first calculates the optimum transmission frequency, and then receives the data transmitted from the data collection device in the well. When the drilling stops, the system of obtaining data on the surface (4) transmits a signal indicating the termination receive data. When the system is receiving and sending data in the borehole (2) receives this signal, obtaining downhole data is terminated.

1. The data transmission method of the wellbore, wherein when the data is used as a carrier wave voltages, and the drill string serves as a data transmission channel, comprising the following steps: receiving and processing data of the borehole, the data collection module, located on the drill string, takes an analog signal, including the data of the borehole, the analog signal is converted into a digital signal using the analog-digital conversion A/D, digital signal enters the module signal processing DSP, which encodes the digital signal in a predetermined encoding format with the aim of obtaining an encoded digital signal; and sending the transmission signal thus encoded digital signal is converted into an analog signal through the d / a conversion signal D/A, analog signal is sent to the data transmission module for amplification, the amplified signal is transmitted to the piezoelectric transducer to launch a piezoelectric transducer, piezoelectric transducer converts the amplified analog signal into a frequency signal wave voltages, and the frequency of the transmission wave voltage is selected within the bandwidth of the drill string and can be automatically adjusted according to different combinations of drill string and the length and frequency signal wave voltage is transmitted to the surface through a drill string; and receiving data on the surface, this module receiving data installed on the pipe drill pipe, receives the frequency signal wave voltage transmitted to the surface, the wireless relay forwards the signal frequency wave voltage is the second in a land-based receiving device, frequency signal wave voltage is converted into a digital signal through the analog-to-digital conversion A/D, then the digital signal is supplied to a ground computer, which identifies the useful signal is weak, hidden among the strong interference from a digital signal, and decodes the useful signal is weak.

2. The method according to claim 1, further comprising a relay system installed in the drill string, the module receiving data in a relay system receives the analog signal, including well data from wells, converts the analog signal into a digital signal through the analog-to-digital conversion A/D and transmits the digital signal to the data processing module, data processing module restores the useful signal is weak, hidden among the strongest interference, and receives the recovered digital signal, the recovered digital signal is converted into an analog signal through the d / a conversion signal D/A and is passed to the module data, analog signal is amplified to run the piezoelectric transducer, piezoelectric transducer converts the amplified analog signal into a frequency signal wave voltages, the signal wave frequency voltages sequentially transferred to the surface.

3. The method according to claim 1, otlichuy is the, what to extract the desired signal is weak from the strong background noise is used for detection of the generator of chaos, for the detection of chaos generator applies the equation Duffing:

where γ is the driving force, µAndAcos(ωt) - adopted by the useful signal is weak, ZS- interference
k is explained by the following formula:
k=ω/z,
where, in turn, ω=2π·f, while f is the frequency,
a z=z1+z2where z1and z2in turn, explained by the following:
z1=and1·ρ·c0and z2=and2·ρ·c0,
whereand1- the cross-sectional area of the drill pipe;
a2- the cross-sectional area of the connection;
with0- the speed of sound in steel;
ρ is the density of steel,
and
when solving the above equation uses a method of Runge-Kutta fourth order to calculate the period of the system and determine whether the signal.

4. The method according to claim 1, characterized in that the digital signal is encoded in a predetermined encoding format "synchronous signal + signal data, a full block of the digital signal is composed of 8 data bits, 1 bit corresponding to the synchronous signal, and 7 bits corresponding to the information signal.

5. The method according to claim 4, characterized in that the synchronous signalled linear signal with frequency modulation to determine the bandwidth and band attenuation of the drill string, the selected bandwidth is determined according to the frequency of the wave equation stresses the drill string, and the frequency with the best effect of passing bandwidth is automatically selected as a frequency for transmitting signals, and the frequency equation of wave voltages of the drill string in the following form:

where d1- the length of the drill string (the middle part);
d2- link length (the sum of the two compounds);
with1- wave speed drill pipe;
c2- wave velocity in the connection;
k=ω/z;
z=z1+z2;
z1=a1·ρ·c0;
z2=a2·ρ·c0;
ω=2π·f;
d=d1+d2;
a1- the cross-sectional area of the drill pipe;
and2- the cross-sectional area of the connection;
with0- the speed of sound in steel;
ρ is the density of steel;
f - frequency.

6. System for data transmission of the wellbore, including the system of receiving and sending data in the borehole and obtaining data on the surface, characterized in that the system of sending and receiving data in a borehole comprises a data collection module of the borehole, the module analog-to-digital signal conversion A/D module, the signal processing DSP module digital to analog signal conversion D/A and a data transmission module, when the volume of the data collection engine well collects data and generates an analog signal; module analog-to-digital signal conversion A/D converts the analog signal into a digital signal and supplies the digital signal to the signal processor DSP; a signal processor DSP encodes the digital signal and outputs the encoded digital signal; digital-analog conversion signal D/A converts the encoded digital signal into an analog signal; a data transmission module comprises a power amplifier and piezoelectric transducer and the amplifier amplifies the analog signal converted by the module to analog conversion signal D/A; piezoelectric transducer converts the amplified analog signal into a frequency signal wave voltages and transmits the signal wave frequency stress the surface through a drill string; and a system for obtaining data on the surface is composed of the module receiving data installed on the pipe drill pipe, wireless repeater, terrestrial receiver module analog-to-digital signal conversion A/D and ground the computer module receiving data receives the frequency signal wave voltage transmitted to the surface and sends a signal frequency wave voltage into a wireless repeater, wireless repeater forwards the signal frequency wave voltage the deposits of the surface receiving device; module analog-to-digital signal conversion A/D converts the signal frequency wave voltage into a digital signal and supplies the digital signal in the surface computer; ground computer identifies useful weak signal from a digital signal and decodes the useful signal is weak.

7. The system according to claim 6, additional comprising: a relay system, which is located between the system receiving and sending data in the borehole and obtaining data on the surface, and the relay system comprises a module for obtaining the data, the module analog-to-digital signal conversion A/D module, data processing module digital to analog signal conversion D/A, the data transmission module and the power module, and the module is receiving data receives an analog signal; an analog-to-digital signal conversion A/D converts the analog signal into a digital signal; a data processing module recovers the digital signal and delivers the recovered digital signal to the module to analog conversion signal D/A; d / a conversion signal D/A converts the recovered digital signal into an analog signal and transmits the analog signal to the data transmission module; a data transmission module comprises a power amplifier and piezoelectric transducer, while the us is the power amplifier amplifies the analog signal, received by the module to analog conversion signal D/A; piezoelectric transducer converts the amplified signal into a signal of a frequency wave voltage and transmits the signal wave frequency voltage to the surface through a drill string; and a power supply module supplies power to an integrated circuit of the relay system.

8. The system according to claim 6, characterized in that the system is receiving data on the surface and the system of receiving and sending data in the borehole can communicate in two directions, the system of sending and receiving data in a hole down in the hole with the drill for drilling when the drilling system of obtaining data on the surface transmits a linear signal with frequency modulation in the system of sending and receiving data in a borehole; a linear signal with frequency modulation is passed down to the system of receiving and sending data in the borehole on the drill pipe; after receiving a line signal with frequency modulation system of sending and receiving data in the borehole calculates the optimal transmission frequency and starts to receive the data transmitted from the data collection device in the well; when the drilling stops, the system of obtaining data on the surface transmits a signal indicating the termination of the receipt of the data; when the system is receiving and sending e is the R in the well receives this signal, obtaining downhole data is terminated.



 

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The invention relates to the field of drilling and can be used mainly to control the underlying technological parameters when drilling oil and gas wells, in particular the number of revolutions of the shaft of the turbo-drill

FIELD: well drilling, particularly devices to convey borehole information via acoustic communication channel during well drilling.

SUBSTANCE: electromechanical converter comprises a set of piezoelectric discs with central round orifices. The set is located between front and rear steel cylindrical covering plates and is tightened with pin passing through above orifices. The pin is created of material having product of density by modulus of elasticity of not more than that of covering plate material, namely steel. Protective container is secured to outer surface of front cylindrical covering plate. The container has connection unit for measuring block attachment. The front cylindrical covering plate is fixedly secured to inner partition of sub. The inner partition is transversal to sub axis and has through orifices. The sub has conical locking threads created on both sub ends adapted to arrange thereof in any drilling string section. Rear steel cylindrical covering plate includes permanent and replaceable trimming sections.

EFFECT: increased operational reliability.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: electromechanical converter of acoustic communication channel includes housing with flushing liquid passage channels, protection container (PC), piezoelectric ceramic element arranged in PC, reducer with lock connection and passage holes of flushing agent to channels of housing, and interface assembly. On opposite end part of the housing there arranged is PC pressing device. At that, piezoelectric ceramic element is installed with possibility of interacting with inner edge surface of PC wall. Housing, PC pressing device and edge part of reducer form a tight chamber in which PC is arranged. Interface assembly is made in the form of a layer of organic-silicon paste, which is arranged between external edge surface of PC wall and edge part of reducer. Signal transmitted via pipe string is received with receivers on the surface.

EFFECT: increasing efficiency of the device owing to providing close acoustic contact between container and drilling site in order to exclude power losses, reduction of manufacturing costs of the device owing to reduction of requirements for accurate processing of contact surfaces, accuracy of their interface, and simplifying the device operation.

3 dwg

Acoustic telemetry // 2431040

FIELD: machine building.

SUBSTANCE: tubular structure consists of sequence of tubular sections butt connected by means of connecting device. At least majority of tubular sections has axial length at least of value X between connecting devices. At least majority of the connecting devices has axial length not exceeding value x. Also, X is considerably bigger, than x. Distance N for transmission of data is at least equal to 10 X. The device is equipped with a facility for transmitting acoustic signals in form of tone from the first position along a structure. Tones have chosen wave guide mode with length of wave at least 2x. At initial propagation each tone has at least temporary length not more, than multiple X/C and in essence less, than 2N/C.The device additionally has a facility for determination of signals in the second position in the structure distant along the structure from the first position at the said distance N.

EFFECT: overcoming problem of interference related to Brillouin dispersion without excessive energy output.

17 cl, 4 dwg

FIELD: oil and gas industry.

SUBSTANCE: device to be used in a well contains metal element with longitudinal axis, antenna with at least two separated groups of grooves made in metal element including at least two rows of grooves each and at least one electrical conductor. In each row of grooves there are at least two grooves. Each groove is made by its cutting in metal element surface. Rows in specified at least two groups of grooves are located in essence on opposite sides of metal element. Conductor is laid along each row of grooves and through each groove in grooves row. Section of electrical conductor passing along each row of grooves is unorthogonal to longitudinal axis of metal element.

EFFECT: increasing strength and rigidity of pipe.

20 cl, 8 dwg

FIELD: oil and gas industry.

SUBSTANCE: telemetric system is proposed for monitoring of bottomhole parameters, using a pipe string for transfer of data with the help of an acoustic field, which comprises a surface module of reception and processing of a signal and a bottomhole module lowered into the pipe string, and the bottomhole module includes a unit of measurement of bottomhole parameters, a unit of control of a bottomhole module, a unit of an acoustic generator, a device of connection and disconnection with a pipe from the pipe string, an actuating mechanism, and also a power supply unit. The actuating mechanism is made as capable of providing a direct acoustic contact with the surface of the internal wall of the pipe by means of pressing of an element to it, which is made of a material with hardness exceeding the hardness of the pipe material, with introduction of the latter into the material of the pipe wall. The surface module of reception and signal processing is made with a function of registration of parameters of an information signal received in one or several different frequency ranges, and with a function of detection of working frequency ranges of the acoustic field by means of their selection inside frequency bands, where the level of natural and structural noise in the field of reception of the information signal on the surface is minimal relative to the level of the specified noise in other frequency bands.

EFFECT: improved efficiency of information transfer with the help of an acoustic field.

9 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves three stages: acquisition and processing of borehole data, sending and transfer of signals, and acquisition of data on the surface. Into a drilling string there can be installed a relay system for recovery of signals. By means of a connecting element between a piezoelectric converter and a drilling pipe and by means of transfer ability of wave of stresses of the drilling string, by detection there automatically chosen is an optimum frequency and used for transfer of signals to the surface through the drilling string. In order to transfer signals, detection of a chaos generator is used, as well as in order to solve a Duffing equation, Runge-Kutta method of the fourth order is used to determine availability of a signal as per the value of the system period, and then, a useful signal is picked up. The system comprises a system for the well data receiving and sending, and a system for data acquisition on surface, as well as it can include a relay system. Signals can be transferred in two directions.

EFFECT: invention can be widely used at drilling using liquid or gaseous fluids; its advantage comprises high data transfer and detection rate.

8 cl, 2 dwg

FIELD: acoustics.

SUBSTANCE: invention relates to downhole acoustic means for telemetry of signals. Device for amplification of acoustic signal, comprising acoustic telemetry transmitter, with range of operating acoustic communication frequencies, hydraulic pulse source, having fundamental frequency of pulsations, and damping adapter. Hydraulic pulse source can excite vibration damping adapter to increase axial vibrations in drill string, mechanically connected to source of hydraulic pulse and damping adapter, to reduce static friction between drill string and formation surrounding drill string. Vibrations are excited on fundamental frequency, which is outside range of operating acoustic communication frequencies.

EFFECT: high reliability of transmitting acoustic signals owing to high amplitude of oscillation in drill string.

20 cl, 7 dwg

FIELD: oil and gas industry.

SUBSTANCE: proposed column (20) for oil and/or gas exploration comprising: a column element (20c) comprising an elongated body, which limits the end-to-end channel and has a side pocket open to the external environment and an acoustic modem (60) mounted in the pocket; a valve (30) mounted in said column element (20c) or upstream of it; and a receiver (70) designed to communicate with acoustic modem (60) via acoustic waves. Receiver (70) adapted to be lowered by a cable (72) inside column (20) and positioned upstream of valve (30). Thus, acoustic modem (60) is adapted to receive electrical signals from one or more sensor (50, 52) and convert the said electrical signals into acoustic waves showing different parameters measured by sensors (50, 52) connected to acoustic modem (60). Receiver (70) is located upstream of valve (30) in the fluid inside column (20). In this case, receiver (70) is spaced at the distance from column wall (20). Wherein, receiver (70) is arranged to trigger the starting acoustic signal passing through the fluid located above valve (30) through valve (30) and through the elongated body wall to activate acoustic modem (60). Thus, activated acoustic modem (60) is adapted to emit acoustic waves passing through the said wall into the elongated body wall through valve (30) and through the fluid located above valve (30). Wherein, receiver (70) is adapted to receive the said acoustic waves emitted by acoustic modem (60) and passing through said valve (30).

EFFECT: reliability simplifying and improving of the bottomhole parameter data transfer system through the column with the valve closed.

20 cl, 10 dwg

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