Seal assembly for electrical logging probe
SUBSTANCE: disclosed is a seal assembly for an electrical logging probe, having a cylindrical housing, a plurality of dielectric inserts placed in the housing, a plurality of annular electrodes coaxially placed in the housing between the dielectric inserts and touching the end faces of the dielectric inserts with their end faces, an insulating means placed on the cylindrical housing for electrical insulation of the plurality of annular electrodes from the housing. According to the invention, each of the plurality of annular electrodes and dielectric inserts in contact with the annular electrodes have bevel end faces. The bevel end faces of the electrodes are interfaced with the bevel end faces of the dielectric inserts that are in contact with them. The seal assembly has a means of generating a compression force and fixing, which is in contact with the end face of the dielectric insert, placed distally with respect to said dielectric insert which is in contact with the cylindrical housing.
EFFECT: high containment of electric equipment of the probe from the external medium of the well and improved probing data.
12 cl, 5 dwg
The technical field
The present invention relates to equipment for well testing, in particular to probes for electrical well logging, and more particularly, to the sealing site of the probe, ensuring the integrity of electrical equipment placed in the probe housing from the external environment of the well.
Studies of rocks high resistance (for example, carbonate and hydrochemical deposition) on the results of measurements ρtoconventional probes significantly affected by salt washing fluid, which facilitates the distribution of electric current along well, and this leads to a strong smoothing of the curves ρto.They are not in connection with on-screen effects layers of small thickness with frequent alternation.
In such conditions apply lateral logging, which is one of the modifications of the method of measuring resistance. When ρtoin the well is measured three-, seven - and deviceelectrode probes.
The most common three-electrode-side logging (figure 1). Side three-electrode probe consists of a Central electrode And0length lmmetal part which is 0.15 m, and two display electrodes And1and a2same length, balanced is a rule located relative to And 0and separated from it by an insulating gaps b, components of 0.03 m All the electrodes have the form of cylinders with a diameter of dC=0,07 m, the size of the probe L is 3.2 meters (the distance between the upper and lower ends of the probe). The shielding electrodes are interconnected short-circuited with the electrode And0they are connected through a resistor (shunt) RW=0.01 Ohm, which is also used to measure current through the Central electrode And0. Through all the electrodes of the probe from the generator G is skipped alternating current.
A second current electrode, which closes the power supply circuit, is braid armored cable. Since the shunt RWhas a very small resistance, the potentials of all electrodes will be almost identical, and therefore the current I0electrode And0does not spread through the borehole and extends perpendicular to the wall, as shown in figure 1 in the form of a nearly horizontal power lines, the thickness of which in the Central part is approximately equal to the length And0. As a consequence, the influence of the borehole and surrounding rocks is manifested in the results of measuring the resistance ρtosignificantly less than conventional probes.
The measured resistance ρtois determined by the voltage between the display electrodes and is equal to the voltage between the electrode And0poskolkuutvarey all of the electrodes are the same, and the remote electrode Nlocated on the multielectrode probe.
There are known various devices for sealing the electrode site of a logging probe.
The closest in technical essence to the present invention is a seal Assembly (figure 2) probe for electric logs, described in the publication, Y.M., Zaworotko "Physical principles of geophysical methods of exploration", Kyiv, 2010.
Known sealing unit probe for electric logs comprises a cylindrical housing, many of dielectric bushings installed on the housing, a lot of the annular electrode is coaxially placed on the housing between the dielectric sleeve and the contacting end surfaces of the end surfaces of the dielectric spacers, the insulating means, placed on the cylindrical housing for electrical isolation of multiple ring-shaped electrode from the housing. Extreme dielectric sleeve contact of the end surface of the cylindrical body. Each of the multiple annular electrodes and a dielectric sleeve in contact with the annular electrodes have end faces perpendicular to the axis of the probe. There are sealing means placed in grooves made on the surfaces of the electrodes, education is connected to the chassis.
The disadvantage closest technical solution is insufficient provide sealing, and the complexity of Assembly/disassembly during operation of the probe in the well.
The purpose of this invention is to provide a sealing unit probe for electric logs, which will provide improved sealing of the probe logging device, as well as provide easier Assembly/disassembly of the node.
The present invention is to create a probe for electric logs containing the above-described seal Assembly. The specified probe that uses the declared seal Assembly is intended for research methods standard electric logs, side logging sensing using three or more electrodes.
The problem is solved by creating a sealing unit probe for electric logs containing cylindrical body, many of dielectric bushings installed on the housing, a lot of the annular electrode is coaxially placed on the housing between the dielectric sleeve and in contact with their end surfaces of the end surfaces of the dielectric spacers, the insulating means, placed on the cylindrical is abuse for electrical isolation of multiple ring-shaped electrodes from the housing, according to the invention,
one of the dielectric bushing contacts the end surface of the cylindrical body,
each of the multiple annular electrodes and a dielectric sleeve in contact with the annular electrodes are beveled end surface, and a beveled end surface electrodes interfaced with a beveled end surfaces in contact with the dielectric bushings
when this seal Assembly includes a tool for creating the effort of pressing and fixing in contact with the end surface of the dielectric sleeve, placed distal of the specified dielectric sleeve in contact with the cylindrical body, and is intended to prevent axial movements of the ring electrodes and the dielectric collet relative to the body,
sealing means placed in grooves made in the end surfaces of the electrodes, while
above the holes formed in the cylindrical housing, the insulation layer is absent.
Preferably the acute angle of the end surface of each annular electrode and the dielectric sleeve relative to the longitudinal axis of the housing is in the range from 20 to 40°.
Preferably, the insulating means is made in the form of a tube of diele the electrical material.
Preferably, as the dielectric material was used fiberglass laminate.
Preferably, the portion of the cylindrical body, which has plenty of ring electrodes and the dielectric sleeve, had reduced diameter with the formation of the annular ledge, the end surface which is in contact with the end surface of the specified one of the dielectric sleeves.
Preferably, the means for creating the effort preload and fixation was performed in the form of a nut, the end surface in contact with the end surface of the distal dielectric sleeve.
Preferably, seal Assembly contained sealing means placed in grooves made on the surface of the chassis end of the dielectric sleeve, and sealing means are in the form of rubber rings.
Preferably in the specified o node electrode is a radiating element or the measuring element.
Preferably the dielectric sleeve is made of polymeric material polyetheretherketone glass fibre reinforced with 30% glass from the total volume of the product (PEEK).
The problem is solved also by creating a probe for electrical logging, which is characterized in that it contains uplo the additional node, performed as described above.
The proposed sealing unit probe for electric logs will help to eliminate mechanical stresses on the device external pressure wells. These loads greatly exceed the loads that occur during operation of the device (compression, tension and bending).
In the proposed design of the sealing unit of the probe by performing end-faces a multitude of ring-shaped electrodes and the end surfaces of the dielectric bushing in contact with the annular electrodes, mating beveled and provided the possibility of realization of the device without system pressure compensation hole.
In the specified probe all elements of the measuring electronics are sealed volume impacted by external hydraulic pressure. Probe part can be considered as the electronic unit logging tool having a casing, perceiving mechanical loads caused by external pressure in the well, and loads occurring during operation, i.e. tension/compression and bending the chassis.
The claimed design does not require the use of expensive technological equipment to maintain the device in working condition, i.e. settings to create a vacuum and oil filtration, oil filling in the device is on, does not require special facilities for carrying out these activities, the premises must only meet the fire safety requirements and does not require specially trained personnel and expensive consumables (special oil).
Brief description of drawings
The invention is further explained in the description of the preferred variants of the embodiment with reference to the accompanying drawings, in which:
figure 1 depicts the current distribution of power lines of the three-electrode probe lateral logging;
figure 2 depicts a known seal Assembly of the probe, according to the prior art;
figure 3 depicts a probe for electrical side logging (longitudinal section), according to the invention;
figure 4 depicts the seal Assembly of the probe (longitudinal section), according to the invention;
figure 5 depicts a portion of the probe for the electrical side logging (longitudinal section), contains many of sealing units, according to the invention.
Description of the preferred embodiment variants of the invention
Figure 3 shows a longitudinal section of a probe containing a sealing unit 1 according to the present invention. The probe comprises a cylindrical housing 2, on which is coaxially installed lots of ring-shaped electrodes 3 and many of dielectric bushings 4, moreover, the ring-shaped electrodes 3 placed between dielectric bushings 4 and in contact with their end surfaces 5 with the end surfaces 6 of the dielectric sleeves.
For electrical isolation of multiple ring-shaped electrodes 3 from the housing 2 to the cylindrical housing 2 posted by insulating means 7 (figure 4), which is made in the form of a tube of dielectric material. As the dielectric material used fiberglass laminate.
End surface of the set ring-shaped electrodes 3 and many of dielectric bushings 4 are beveled, which provides a better fit end surface of the electrode 5 to the end surface 6 of the sleeve.
Due to the fact that the contacting surfaces of the electrodes 3 and sleeves 4 are beveled, provides tight coupling of these surfaces. When the Assembly under the action of pressure F1 (5) the beveled surface 5 of the ring electrode 3 is pressed against the beveled surface 6 insulating sleeve 4, and thus provides a good seal.
Preferably, the acute angle of the end surface 5 of each annular electrode 3 and the end surface 6 of the dielectric sleeve 4 relative to the longitudinal axis of the housing 2 is in the range from 20 to 40°.
Figure 4 shows an example in which the probe contains two electrodes 3 and two dielectric sleeve 4, however, it is possible that the node contains an even number of ring electrodes and an odd number of dielectric bushings (figure 5) or n is turnover.
Seal Assembly includes a tool 8 creation efforts preload and fixing in contact with the end surface 9 of the dielectric sleeve 4A, placed distal of the dielectric sleeve 4b in contact with the cylindrical body 2, and is designed to prevent axial movements of the ring electrode 3 and dielectric bushings 4 relative to the housing 2. As a means of 8 creation efforts preload and fixation can be used nut, which provides reinforcement and the preload ring electrode 3 and dielectric bushings 4. End surface of the nut contacts the end surface 9 of the distal dielectric sleeve 3A.
In the recesses 10 (figure 4)made in the end surface 5 of the ring electrode 3 is placed a sealing means 11.
Over holes 12 made in the cylindrical housing 2, a layer of dielectric material (insulation) is missing. Holes 12 are for the node 13 electrical connections of the electrode.
In the described embodiment, the embodiment of the portion of the cylindrical body 2, which has plenty of ring electrodes 3 and the dielectric sleeve 4 has a reduced diameter with the formation of the annular ledge 14, the end surface 15 of the ledge 14 is in contact with the end surface 16 dielectr the cooling sleeve 4b, adjacent to the housing 2.
On the surfaces of the electrodes 3 in contact with the insulating tube 7, the recess 17 in which is placed a sealing means 18, in this case representing a rubber ring.
On the surface of the housing 1 under the integral dielectric sleeves 4A and 4b made of the recess 19 in which is placed a sealing means 20, which are also made in the form of rubber rings.
The annular electrode 2 is emitting or measuring element.
The dielectric sleeve 3 is made of a polymeric material PEEK of polyetheretherketone glass fibre reinforced with 30% glass from the total volume of the product. In the manufacture of dielectric bushings and glass filled polymer powder in the form of "dust", after which there is a casting under pressure and at high temperature.
O-ring 11b 20 cover any potential gaps and protect the site of the probe from the penetration of the external environment.
Probe for electric logs contains the seal Assembly described above.
The proposed option of carrying out the invention is not restrictive.
1. Sealing unit probe for electric logs containing cylindrical body, many of dielectric bushings installed on the body, lots of ring-shaped electrodes, Koa is ciolino placed on the housing between the dielectric sleeve and in contact with their end surfaces of the end surfaces of the dielectric bushings insulating means, placed on the cylindrical housing for electrical isolation of multiple ring-shaped electrodes from the housing, wherein one of the dielectric bushing contacts the end surface of the cylindrical body, each of the multiple annular electrodes and a dielectric sleeve in contact with the annular electrodes are beveled end surface, and a beveled end surface electrodes interfaced with a beveled end surfaces in contact with the dielectric bushings, thus sealing unit contains a tool for creating the effort of pressing and fixing in contact with the end surface of the dielectric sleeve, placed distal of the specified dielectric sleeve in contact with the cylindrical housing, and designed to prevent axial movements of the ring electrodes and the dielectric bushing relative to the housing, sealing means placed in grooves made in the end surface of the ring electrode, while over the holes formed in the cylindrical housing, the insulation layer is absent.
2. Seal Assembly according to claim 1, characterized in that the acute angle of the end surface of each annular electrode and the dielectric is tulki relative to the longitudinal axis of the housing is in the range from 20° to 40°.
3. Seal Assembly according to claim 1, wherein the insulating means is made in the form of a tube of dielectric material.
4. Seal Assembly according to claim 3, characterized in that the dielectric material used fiberglass laminate.
5. Seal Assembly according to claim 1, characterized in that the portion of the cylindrical body, which has plenty of ring electrodes and the dielectric sleeve has a reduced diameter with the formation of the annular ledge, the end surface which is in contact with the end surface adjacent to the body of the dielectric sleeve.
6. Seal Assembly according to claim 1, characterized in that the means for creating the effort preload and fixation made in the form of nuts, the end surface in contact with the end surface of the distal dielectric sleeve.
7. Seal Assembly according to claim 1, characterized in that it contains sealing means placed in grooves made on the surface of the chassis end of the dielectric sleeve.
8. Seal Assembly according to claim 1 or 7, characterized in that the sealing means made in the form of rubber rings.
9. Seal Assembly according to claim 1, characterized in that the annular electrode is radiating or measuring element.
10. Seal Assembly according to claim 1, characterized those who, that the dielectric sleeve is made of a polymeric material PEEK of polyetheretherketone glass fibre reinforced with 30% glass from the total volume of the product, the glass is filled into the powder in the form of "dust", after which there is a casting under pressure and at high temperature.
11. Probe for electric logs, characterized in that it contains seal Assembly according to claims 1-10.
FIELD: measurement equipment.
SUBSTANCE: method is proposed to exhaust to surface vapours of cryogenic liquids from a cooling system of a submersible logging instrument, using cryogenic liquids for maintenance of low temperatures in some devices of the logging instrument (superconducting magnets, transceiving antennas, cryogenic sensors of various purpose). The output of the cryostat of the logging instrument is connected to atmosphere or an accumulating tank on the earth surface by means of one or several capillaries, which are simultaneously strands of a power cable included into a rope, on which the submersible logging instrument is suspended. To calculate the necessary radius of the capillary, the formula
EFFECT: higher intensity of logging instrument cooling.
SUBSTANCE: in the disclosed methods, accurate formation information is provided regardless of formation and borehole geometry, including information associated with high angle and horizontal wells. According to embodiments, in providing processing of logging or image data, such as may be provided by a density tool or other tool, formation parameters or features (e.g., density and dip angle) are estimated using raw data provided by the tool. Said estimations may then be iteratively refined using effective volume of investigation information. According to embodiments, depth boundaries of formation information provided by the tool are shifted as a function of azimuth for correct spatial positioning of formation features using effective volume of investigation information. Processing of formation parameter or feature data provided by embodiments may be used with respect to various tool configurations, including configurations with and without borehole standoff.
EFFECT: estimating formation depth boundary based on logging data which provide formation parameter data for a plurality of azimuthal angles, wherein said formation depth boundary is estimated for each of said azimuthal angles.
25 cl, 10 dwg
SUBSTANCE: device includes magnetic field sensors, orientation and magnetic susceptibility sensors, control unit and information processing system. At that, when using additional sensors and measuring units, it is possible to measure natural radioactivity, temperature, induced medium polarisation at eight electric field decrease time intervals and apparent resistance per lowering-hoisting operation using single-core cable and information transfer immediately to log recorder, which sufficiently cheapens the hole logging and shortens the time required for logging works.
EFFECT: improving efficiency of logging works.
FIELD: oil and gas production.
SUBSTANCE: procedure consists in coupling generator of acoustic pulses to wellhead and to electrode, in measuring acoustic response to electric disturbance and in evaluation of shape and dimensions of water-flooded area of oil deposit. The grounded electrode is installed at a distance from the well sufficient to avoid electric breakthrough between the wellhead of the well and the electrode. Further, pulse voltage is applied between the well head and the electrode. Algorithms of 4D seismic are implemented for evaluation of a shape and dimensions of water-flooded area of the oil formation.
EFFECT: accurate measurement at small dimensions of water-flooded area of oil formation in vicinity of well.
3 cl, 1 dwg
SUBSTANCE: device comprises k three-element probes, consisting of generator and pair of receiving coils, switched generator of working frequencies with power amplifiers, switched generator of heterodyne frequencies, k inlet switches, k high-frequency amplifiers, having inlets of amplification control, track of intermediate frequency, k circuits of automatic amplification control, amplitude metre, switching unit, computer unit, multiplexer of high frequency signals, demultiplexer of signals from metre of k calibration circuits amplitudes. Inlet switches and circuits of calibration alternately connect signals A2 and A1 from receiving coils of probes, their difference signal ΔA and calibrating signal to inlets of device, and these signals are converted by amplification-conversion track into digital code and arrive to computer unit. Computer unit corrects signals by calibrating signal and calculates ratios |A2|/|A1|, |ΔA|/|A1|, |ΔA|/|A2| and phase difference.
EFFECT: enhancement of functional capabilities, increased accuracy of measurements and operational reliability.
FIELD: oil and gas industry.
SUBSTANCE: invention refers to well geophysical investigations and namely to electric logging instruments used during boring. Electric logging device using during boring consists of an electric divider installed between a pipe string and the lower part of the boring tool. To the middle of the boring tool lower part there applied is electric insulating coating above which at least one electrode is installed. Between the pipe string and the lower part of the boring tool a transmission device is arranged. At that, the electrode is connected to the lower part of the boring tool through the current metre the output of which is connected to the first input of the transmission device and the potential metre the output of which is connected to the second input of the transmission device. On both sides of the electrode there can also be installed additional electrodes electrically connected through the key device to the lower part of the boring tool and connected through current generator to the transmission device.
EFFECT: enlarging functional capabilities of the device as well as increasing informativity of the logging geophysical data.
2 cl, 2 dwg
SUBSTANCE: invention relates to wireless communication by means of radio signals intended for geological formations surveying. According to the invention, wireless communication circuit contains oscillatory circuit consisting of reactance coil being in parallel connection with capacitive circuit, and feedback circuit. Capacitive circuit contains two serially connected capacitors. Each capacitor with proper capacitance value is coupled with grounding by common conductor. The reactance coil and capacitive circuit define frequency of a signal. The coil acts as antenna. Oscillatory circuit can function as transmitter and receiver.
EFFECT: feedback circuit contains feedback circuit 1 and 2 to ensure selective signal coding.
3 cl, 10 dwg
SUBSTANCE: cable consists of one or several isolated leads coated with one or two, or three pairs of armored layers and with exterior polymer coating; also each layer of exterior pair is executed with lay length equal to 8÷12 multiple diameter of laid layer with gaps between wires providing 60-70% filling of layer from close laying, while rest free part (30-40%) of both layers of armor of exterior pair is filled with polymer material of exterior coating.
EFFECT: increased tear resistance of cable on a whole and adhesion hardness of polymer coating to surface of wires of exterior pair of armor; increased corrosion protection of cable from aggressive well fluid.
SUBSTANCE: invention is related to the field of electrical engineering, in particular, to borehole telemetering systems for transfer of signals between surface device and borehole instrument installed in borehole. Wired drill pipe is suggested for drilling stem of borehole instrument installed in borehole that penetrates geological layer. Wired drill pipe includes drill pipe, cable and wire holder. Drill pipe is provided with slot in its end. Slots are able to receive at least one transformer. Drill pipe has internal surface that forms channel for flow of borehole mud through it. Cable passes from transformer into channel of drill pipe. Wire holder is located on internal surface of drill pipe. Wire holder is intended for cable fixation in it.
EFFECT: reduction of probability of electric faults and/or failures because of proper contact between neighbouring pipes.
37 cl, 51 dwg
FIELD: physics; measurements.
SUBSTANCE: invention pertains to geophysics, and particularly to geophysical well surveying for separating hydrocarbon layers. The apparent electrical resistivity is measured using lateral or electromagnetic logging probes before and after action of elastic resonance pulses on the layers in the 0.1-10 kHz frequency range. The action is effected using an electrohydraulic resonance apparatus. Measurements are done using lateral or electromagnetic logging probes. The collectors of hydrocarbon layers are separated based on the results of the measured apparent electrical resistivity of the layers.
EFFECT: increased accuracy of separating low-pore and low-permeability collectors with hard to recover hydrocarbon reserves.
FIELD: radio engineering, communication.
SUBSTANCE: disclosed is a method of transmitting measurement data by a cable-free telemetric system when drilling wells, involving encoding and transmitting information via a phase-shift keyed signal in form of a sequence of pulses, synchronising the signal and receiving the encoded information by a land receiver. One-time (initial) phase synchronisation of precision quartz-crystal oscillators of the transmitter of the bottom telemetric system and the land receiver is carried out by accumulating data on the transitioning of the signal through zero and one-time synchronisation of signals using a priori information on the bottom telemetric system at the current moment in time is also carried out. Prolonged stability of synchronisation of said oscillators is ensured by adjusting the phase of the quartz-crystal oscillator of the land receiver relative to the statistically determined transitioning through zero of the signal of the transmitter of the bottom telemetric system.
EFFECT: higher capacity of the communication channel and high noise-immunity thereof.
FIELD: oil and gas industry.
SUBSTANCE: system includes flexible tubing having a fibre optic conductor and a section with instruments. At that, fibre optic conductor is located in a cavity flush with outer surface of the section of flexible tubing equipped with instruments. Besides, the above cavity is curved. The system also includes a device for fixing the fibre optic conductor on the surface of the wall of flexible tubing, an adapter through which the above conductor passes to an internal fibre optic conductor, and a connecting coupling. The latter has the possibility of data transferring by means of contactless telemetry.
EFFECT: improving measurement efficiency of one or more parameters in the well along a certain zone of the well.
21 cl, 9 dwg
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
FIELD: measurement equipment.
SUBSTANCE: formation method of measurement data packages of a cable-free telemetric system during the well drilling involves coding of every four bits of information with a noise-like signal (NLS) with the length of 16 bits and information transfer by means of a phase-shift signal, packages of various types. The data measured in dynamics in the turbine drilling mode is transferred in S-O1-Z-O2-A-O3-"Г"-O4 packages consisting of synchronisation sending (S), diverter (O1), zenith (Z), diverter (O2), azimuth (A), diverter (O3), gamma background level ("Г"), diverter (O4). The data measured in dynamics in the rotary drilling mode is transferred in S-1-"Г"1-R1-"Г"2-R2-"Г"3 packages consisting of synchronisation sending (S), special NLS equal to one and serving for identification of the package type, gamma background level ("Г"1), formation resistance (R1), gamma background level ("Г"2), formation resistance (R2), and gamma background level ("Г"3). The data measured in statics is transferred with S-9-"Г"1-Z-R-A-"Г"2 packages consisting of synchronisation sending (S), special NLS equal to 9 and serving for identification of the packages type, gamma background level ("Г"1), zenith (Z), formation resistance (R), azimuth (A), and gamma background level ("Г"2).
EFFECT: increasing informativity of transferred parameters owing to increasing transfer frequency of logging parameters of gamma background and formation resistance.
FIELD: oil and gas industry.
SUBSTANCE: method for determining the saturation of reservoir beds involves determination of porosity coefficient of the investigated formation using two-probe neutron-neutron logging as per thermal neutrons. Calculation of porosity function as the ratio of intensities of flows of thermal neutrons. Recording of GIRZ spectrum intensities. Measurements are carried out during cement setting period of time after 2-4 days from the beginning of cementing of the well shaft, or 2-4 hours after the drilling tool has been raised out of the well. There are cross-plots as per dependences. On cross-plots there performed is approximation of lower points of quadratic function, which correspond to water-bearing formations with drill mud filtrate, and the function reflecting "deficiency of density and hydrogen content" in the nearest zone is calculated as per the given formula.
EFFECT: enlarging the range of application; improving its accuracy and informativity.
4 dwg, 2 cl
FIELD: oil and gas industry.
SUBSTANCE: method involves lowering of packers and equipment for extraction (pumping) of product in interval of product extraction on tubing string located against each productive formation. Down-hole measurements are performed by sensors. Obtained date is transmitted to ground receiving-processing unit by means of electronic self-powered measurement modules transmitting data signals by tubing string by electromagnetic pulses to common electronic self-powered transmitting module. Module is installed in tubing string assembly above the highest productive formation. Data high-frequency signals are amplified and transmitted to ground receiving-processing unit through rock. Equipment for extraction (pumping) of product is controlled by communication channel or by hydraulic communication channel using independent electronic modules. Modules contain housing in which the following is installed: valve for control of supply (removal) of fluid medium controlled by step-type tiny engine with driving mechanism of valve gate rotation, autonomous power supply unit, receiver of fluid pulses and dipole receiver of electromagnetic oscillations, amplifier modules of decoding device and power amplifier.
EFFECT: improving efficiency of monitoring of simultaneous separate operation of wells by means of provision of reliability of data transmission by two-way wireless communication between well equipment and ground receiving-processing unit.
8 cl, 6 dwg
FIELD: oil and gas industry.
SUBSTANCE: method of hydrodynamic investigations involves lowering of equipment for investigation of formation with self-contained measuring device by assembly pipes. Interval of investigation is sealed by packer. Arrangement of fluid influx sequence is provided by feed valve, investigated parameters are recorded by self-contained measuring device at the same time. Packers are released, equipment is lifted to wellhead by assembly pipes with further decoding of self-contained measuring device records. Tubing string is preliminary equipped with a seat, in which detachable receive/transmit module is lowered by geophysical cable. Parameters measured by self-contained measuring device are recorded by electromagnetic communication channel in predetermined time mode. Equipment corresponding to the method is also proposed.
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
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: well drilling technologies.
SUBSTANCE: method includes cutting a special conic thread, which is made with triangular profile with rounded corners, at sleeve and nipple portions of electric separator, sand-stream treatment is performed and also grease is removed from parts screwed together. After that a sub-layer is applied to increase adhesive metal properties. Composition dielectric material is applied to threaded connection of nipple portion, after that thread shape is altered by this material, then adhesive is applied to screwed surfaces of threads and sleeve and nipple portions of electric separator are screwed together. After that a layer of dielectric substance is applied along outer surface of subs. Inside the electric separator a dielectric insert is mounted or dielectric film is applied by pressing method with use of press-form. Dielectric film is applied on outer surface of electric separator by forming method under pressure with use of press-form or of composition dielectric material by winding method.
EFFECT: higher durability and reliability.
1 dwg, 1 ex