Method to transfer information from well along electromagnetic communication channel and device for its realisation

FIELD: electricity.

SUBSTANCE: method to transfer information from a well consists in the following: using a surface generator, electrical current is excited in a string of metal pipes, which generates electromagnetic field spreading in the rock of the well, which reaches the bottomhole area and creates the difference of potentials between the metal string and its isolated part. Receipt of information from the bottomhole is carried out depending on modulation of the voltage value required for stabilisation of the surface generator DC. The surface generator is a source of a stabilised DC. Besides, the surface generator is connected with one clamp to a surface part of the pipe string, and by the other one - to a grounded electrode that is remote from the well head. At the same time for transfer of information from the bottomhole the lower and upper parts of the string are closed or opened, changing the efficient value of conductivity between the grounding electrode of the current source and the metal string. When the key is closed, the specified efficient conductivity increases, and voltage on the current source clamps reduces and is recorded by a recording unit. By variation of the measured voltage the parameters of the drilled bed are decided.

EFFECT: increased reliability of information transfer from a bottomhole and expansion of its application area.

2 cl, 1 dwg

 

The alleged invention relates to the field of information transfer from the borehole, for example, logging while drilling, and is intended for transmission of measurement signals from the well to the surface electromagnetic communication channel.

There is a method of creating electromagnetic communication channel, which consists in the excitation of the electric current in the column of metal tubes separated by a dielectric insert, and registration on the surface of the induced potential difference between the column of drill pipe and a remote point from the wellhead. This induced potential is modulated appropriately coded signal (information), but are required for the excitation current energy is generated on the face by a downhole generator, discharging of the power flow of washing fluid generated by the drilling pump (Molchanov, Gsanremo. Wireless system for studies of oil and gas wells (theory and practice). / Under the General editorship Have. - Moscow, JSC "VNIIEM", 2003).

The disadvantages of the method are unstable signal magnitude associated with the changing conditions of the currents in soils and limited downhole power generator, and the inability to use bezzabotnov (borehole) energy source that limits the scope ol the application system.

The known method of transmission/reception geophysical data during the drilling of the wireless electromagnetic communication channel from downhole to the surface (U.S. Pat. Of the Russian Federation No. 2273732, prior. 21.05.2004, publ. 10.04.2006).

In the known method modulate the voltage generating signal to the surface by connecting the poles of land generator respectively to the string of drill pipe and a remote point from the wellhead and downhole electric dipole carry out signal ground of the generator. Allocate a clock frequency of ground generator and synchronous with her commute the encrypted message, the electric dipole on the bottom. At the wellhead measure the current generation by highlighting pulsations using synchronous detection. Measured at the mouth of the magnitude of the ripple current caused by the switching of the electric dipole on the face, judge geophysical parameters to be drilled formation on the surface. The frequency of ground generator on the surface change for better conditions of signal reception on the face.

The disadvantage of this method is that it assumes, in the electric dipole receiver signal from a ground-based generator, which determines the frequency at which the electric dipole should be switched, the signal may disappear (salt is replaster) and distorted with the passage of weakly conductive layers, and reliability of communication falls. In addition, it complicates the design of an electric dipole.

The task of the group of inventions is to improve the reliability of information transmission from downhole electromagnetic communication channel and extending the scope of its application.

This task is solved in that in the method of transmitting information from wells in the electromagnetic channel, including the excitation of the electric current in the column of metal pipes in the well using ground-based generator that is connected to one contact to ground the metal parts of the column and another contact is remote from the wellhead grounding electrode, the switching of the dielectric insert and receiving information from the borehole bottom, depending on the ripple caused by the switching of the dielectric insert, in contrast to the known method, as the ground of the generator using a constant current source, stable value, and obtaining information from the borehole bottom is carried out in dependence from the modulation voltage required to stabilize the DC ground of the generator (source of stabilized voltage) when the change in the effective value of the resistance of steel columns, caused by the switching of the dielectric insert.

Applying the device to implement the methods for the and, containing ground generator attached one clip to ground the metal parts of the column and the other clamp to the remote from the wellhead grounding-electrode dielectric insert that separates the metal column in the well on the upper and lower parts, the key to opening and closing of the contacts of the upper and lower parts of the metal columns, where as the ground of the generator used source of the stabilized DC, and between these clips installed the registration unit changes the voltage of this current.

The essence of the method. On the surface by using a constant current source, connected to one contact (clip) to ground the metal parts of the column and another contact (clip) - remote from the wellhead of the grounding electrode in the borehole serves DC, stable value, which, passing through the metal column, separated by a dielectric insert, generates an electromagnetic field which, propagating the breed in the well reaches the bottom zone and creates a potential difference between the metal casing and isolated part of it.

To send the message from downhole electromagnetic channel close or unlock (commute) key lower and upper metal columns, changing ffektivnoe, the conductivity between the grounding electrode of the constant current source and a metal column. With the closure of the key specified effective conductivity increases, and the voltage at the terminals of the constant current source falls and is registered by the registration unit, for example a differential voltmeter. The change in the measured voltage is judged on the parameters of the drilled formation. Duration and sequence of closures of the key is determined by the encryption module downhole unit of measurement (not shown due to being well-known). Thus, the useful signal is the change in the voltage at the terminals of the current source that maintains a constant (stable) current, which is determined by the conditions of transfer - conductive layer.

When this change (modulation) voltage ΔV on the ground clamps generator is calculated by the formula:

where G is the effective conductivity between the grounding electrode of the constant current source and the metal column is determined by the formula:

and

where A=ln(D2/D1),

ΔG is the change in the effective value of the conductivity between the grounding electrode of the constant current source and a metal column,

α, dα - angles corresponding to the open and closed state of the dielectric is rate (see the drawing),

ρ is the resistivity of rocks, Ohm·m,

D1 is the distance between the metal pillar and the ground electrode, m,

D2 is the diameter of the grounding electrode, m,

With experimental coefficient, m

The value is defined in the "selection" voltage for the optimal value of the constant current, measured in metres and plays a supporting role, since ΔG is not calculated and the measured value. In formulas 1, 2, 3, above, takes into account the distance between the metal pillar to the grounding electrode, the diameter of the grounding electrode, the thickness of the dielectric insert, the length of the upper and lower parts of the metal columns, measured in meters. The consideration of these parameters improves the accuracy of the measurements.

The implementation of the method can be carried out by the device shown in the drawing.

The device includes a constant current source 1 is connected to one contact 2 to ground the metal parts of the column 3, and the other contact is remote from the wellhead to the distance D1 of the grounding electrode 4 with a diameter D2. Between these contacts (terminals) installed block registration of the change of voltage, for example a differential voltmeter 5. Metal column 3 in the well are separated by a dielectric insert 6 on the upper part with dline the L1 and the lower part with a length L2, the contacts 7 and 8, respectively, are closed/opened by a key 9. POS. 10 - top contact between the upper part of the metal columns 3 and earth, pos.11 - lower contact between the bottom of the metal columns 3 and ground. L3 is the thickness of the dielectric insert 6. α, dα - angles corresponding to open and closed contours dielectric insert 6.

Ground the generator 1 produces a constant regulated amount of current that is passing through the metal column 3, separated by a dielectric insert 6, generates an electromagnetic field which, propagating the breed in the well reaches the bottom zone and creates a potential difference between the metal casing 3 and an isolated part of the length L2.

With the closure of the key 9 effective conductance G increases and the voltage source constant current drops, which is registered by the differential voltmeter 5 connected to the terminals of the specified power source. However, changing the potential difference is modulated appropriately coded signal (information).

1. A method of transferring information from wells in the electromagnetic channel, including the excitation of the electric current in the column of metal pipes in the well using ground-based generator connected one behind the Imam to ground the metal parts of the column, and another clamp to the remote from the wellhead grounding electrode, the switching of the dielectric insert and receiving information from the borehole bottom, depending on the ripple caused by the switching of the dielectric insert, characterized in that as the ground of the generator using a constant current source, stable value, and obtaining information from the borehole bottom is carried out in dependence on the modulation voltage required to stabilize the DC ground of the generator, a source of constant current when the change in the effective value of the resistance of steel columns, caused by the switching of the dielectric insert.

2. Device for transferring information from wells in the electromagnetic channel containing ground generator attached one clip to ground the metal parts of the column and the other clamp to the remote from the wellhead grounding-electrode dielectric insert that separates the metal column in the well on the upper and lower parts, the key to opening and closing of the contacts of the upper and lower parts of the metal columns, characterized in that as the ground of the generator used source of the stabilized DC, and between these clamps installed unit registers the voltage of this current.



 

Same patents:

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.

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20 cl, 8 dwg

FIELD: physics.

SUBSTANCE: logging device has at least one antenna, having a vertical axis, and at least two electrodes spaced apart in the azimuthal direction. The antenna is placed between the two electrodes. The device also has a processor which is capable of powering one of the components, including at least one antenna and at least two electrodes, for generating electric current in the rock, and using a signal which is sensitive to electric current generated by the other of said components in order to determine resistivity of the rock.

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20 cl, 13 dwg

FIELD: physics.

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EFFECT: high accuracy of the obtained probing data.

23 cl, 11 dwg

FIELD: physics.

SUBSTANCE: electromagnetic probe 1 measures electromagnetic properties of a geological formation GF in an bounded zone surrounding a well borehole WBH. The well-bore hole is filled with a well fluid DM. The probe comprises a pad 2 having a first face defining a first area meant to be in contact with the well borehole wall WBW. The probe 1 further comprises: at least two transmitting antennae 4A, 4B defining a central point CP between them, each antenna lying at a distance d0 from the central point, and at least a first 5A, 5B and a second set 5C, 5D of receiving antennae, each set comprising a first receiving antenna 5A, 5C and a second receiving antenna 5B, 5D. The first receiving antenna lies on one side of the transmitting antennae and the second receiving antenna lies on other side of the transmitting antennae so that each set encompass the transmitting antennae 4A, 4B. The probe 1 further comprises a coaxial cable with an open end 6A, placed on the first surface and lying perpendicular to the first area between the transmitting antenna 4A and the receiving antenna 5B.

EFFECT: high accuracy.

17 cl, 8 dwg

FIELD: physics.

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22 cl, 8 dwg

FIELD: oil and gas production.

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21 cl, 13 dwg

FIELD: physics; geophysics.

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9 dwg

FIELD: physics; geophysics.

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2 dwg

FIELD: physics; geophysics.

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22 cl, 19 dwg

FIELD: mining.

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4 dwg

FIELD: measurement equipment.

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4 cl

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FIELD: oil and gas industry.

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8 cl, 6 dwg

FIELD: oil and gas industry.

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EFFECT: improving efficiency of works on formation investigation by formation tester on pipes, improving informativity and speed of decoding or recorded parameters.

2 cl, 1 dwg

FIELD: electricity.

SUBSTANCE: downhole system comprises a three-phase power cable, a source of supply, an electric submersible pump and a gauge. The cable stretches from the surface into a well and may provide supply to the three-phase motor with certain voltage and frequency. The source of supply is connected to the three-phase power cable and may produce AC for supplying to gauges, sending it along all three conductors of the three-phase power cable. The pump is connected to the three-phase power cable and comprises a three-phase motor receiving supply along the specified three-phase power cable. The gauge is connected to the three-phase power cable using a capacitance link with the possibility to receive AC of gauge supply. At the same time the value of the current voltage is lower than the value of the three-phase motor supply voltage, and frequency is higher than frequency of the three-phase motor supply voltage.

EFFECT: improved system of downhole gauge supply.

18 cl, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: logging device includes housing, centring assembly and scanning head. Housing is oriented along longitudinal axis. Centring assembly positions the housing in the well centre and includes the first slide and group of centring brackets connected to it. The first slide has the possibility of sliding along longitudinal axis so that random control of radial retraction of the above group of centring brackets can be provided. Scanning head rotates scanning sensors axially inside the well around longitudinal axis and includes the second slide and connecting brackets connecting the second slide to the specified scanning sensors. Besides, the second slide has the possibility of sliding along longitudinal axis so that random control of radial retraction of the above sensors can be provided.

EFFECT: increasing the logging efficiency.

20 cl, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: method applied for signal transfer to measuring instrument in well shaft involves acceleration along measuring instrument axis in the specified acceleration profile. Pre-determined acceleration profile corresponds to the signal subject to transfer. Axial acceleration of measuring instrument is recorded, and signal from recorded axial acceleration is decoded. Signal recording system for measuring instrument in the well shaft includes accelerometer oriented along longitudinal axis of measuring instrument, and device for comparison of measurements made by means of accelerometer at least for one pre-determined acceleration profile.

EFFECT: easier signal transfer and simpler design.

15 cl, 4 dwg

FIELD: information technology.

SUBSTANCE: system for monitoring temperature of extended objects has temperature sensors, a means of collecting data coming from the extended object, a means of transmitting data, a computer for assessing and collecting data, lying away from the extended object and meant for receiving and assessing data. According to the invention, the system for monitoring temperature of extended objects further includes an Ethernet and the Internet, a network hub, temperature sensors, each lying in a separate protective housing and fitted with an integrated interface, connected to each other by a flexible cable and forming m thermistor chains with nm temperature sensors in each.

EFFECT: high accuracy of measurement and reliability, simple system for monitoring temperature of extended objects, wider field of use.

FIELD: oil and gas industry.

SUBSTANCE: method of simplification the collective work between the users at drill site and users at remote location consists of the following stages: many types of oil well data are collected at drill site for aggregated data formation; aggregated data is converted into standard format; aggregated data is saved on data aggregation server at drill site in standard format. Note that data aggregation server has data storage that has a set of analytical tools configured for aggregated data analysis. Oil well data is compared to the data description referred to it, compared data is saved in knowledge base at the drill site. Note that the compared data is used for conversion of unknown data of oil well into the standard format. The copy of aggregated data and compared data is saved on local server in remote location. Note that the local server stores the mirror copy of the data that is stored at data aggregation server. Note that the user at drill site can access the aggregated data and analyse them with the aid of a set of analytical tools at data aggregation server. The user in remote location can access the aggregated data saved at local server as well as analyse them with the aid of a set of analytical tools.

EFFECT: increase of efficiency of working processes control between the users at drill site and users in remote location.

25 cl, 16 dwg

FIELD: oil and gas industry.

SUBSTANCE: sensors are placed into a bed surrounding a well bore. A device is placed to realise the method into a well bore. The well bore zone is isolated. The pressure is changed in the zone with the help of making changes into the flow via a valve. Bed pressure is measured at a location of each sensor, and the received data is sent to an antenna array. Pressure is measured in the zone by a pressure gauge. Horizontal and vertical permeability of the bed is identified using the received measurements. At the same time the device comprises a bed tester (BD) lowered on a drilling string. The BD is equipped with a packer to isolate the well bore zone. The BD comprises a valve to control the fluid flow via a drilling string of a tool into the zone and from the zone and a pressure gauge to measure the pressure in the zone. The device additionally comprises an array of at least two antennas. Antennas are assembled on the tool above the packer so that in process of usage each antenna of the array is balanced with the appropriate pressure sensor placed into a bed, to obtain pressure measurement and to determine horizontal and vertical permeability.

EFFECT: possibility to characterise permeability of a bed in two dimensions, horizontally and vertically.

14 cl, 6 dwg

FIELD: well drilling technologies.

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EFFECT: higher durability and reliability.

1 dwg, 1 ex

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