Method of 3d-sea electrical exploration of oil and gas deposits
FIELD: physics, measurements.
SUBSTANCE: invention relates to exploration geophysics. In compliance with this invention, bottom stations are installed on sea bottom along the line, i.e. profile, covering the area to be explored to form the observation profile (OP), the said station are spaced 1000 m apart. A ship incorporating a generating dipole is directed through the centre of one of electrode separations, close to the centre of explored area area, perpendicular to OP, to form an excitation profile (EP). The electric field magnitudes picked off the bottom station receiving electrodes are referenced to the centre of distance between the appropriate separations of aforesaid bottom station to form an area system of measurement profiles (MO). A one-dimensional inversion is performed for every MO. Proceeding from the data obtained, a 3D geoelectric model of the medium is constructed in units of specific resistance, or specific resistance and parametres of polarisability. Now, proceeding from their abnormalities it is possible to judge upon the presence of a deposit, its position in plan and depth. The ship can carry out researches both with horizontal generating dipole towed on sea surface, and with vertical or horizontal dipole towed on over sea bottom.
EFFECT: reliable forecasting at depths from 0 to 2000 m and deeper.
9 cl, 2 dwg
The invention relates to the field of exploration Geophysics, and is intended for forecasting of hydrocarbon deposits on the continental shelf at depths from 0 to 2000 meters and more.
Now for Maritime exploration of hydrocarbon deposits are widely used various methods associated with the impact on the seabed of the pulses of electromagnetic fields, registration of changes of electromagnetic parameters of benthic species and the analysis of the received data to detect existing anomalies and determine their nature (EN 2236028, 2004; SU 1122998, 1984; SU 1798666, 1996; SU 1434385, 1988; US 4298840, 1981; US 4617518, 1986), which are using different research complexes instruments and equipment (IR).
For example, the famous SU 1434385, 1988, which proposed IR, consisting of a spread on the bottom of the supply line, the length of which is 5 to 10 times greater than the specified depth research, it is connected to the generator and sensor measurements, connected to the measuring equipment. After setting up the equipment and compensation signals of the natural field and own the polarization of the electrodes of the sensors in line excite an electric field by passing current pulses, and at the end of each pulse interval time is measured corresponding signals induced polarization and on the basis of the obtained results make the modeling section. Under taccom method is the low performance.
Previously the authors have developed a technology implementation survey method (EN 0048645, 2005), namely that on Board posted by the generator and block the formation of the exciting field (FFT)to generate the pulses in discrete mode and measuring equipment and auxiliary devices, and FFT is associated with submerged vertical dipole with the feed electrode, the lower end of which is at a distance of not more than 100 m from the seabed. For reception of signals using the set of bottom stations (DS), which uses standard electric or magnetic bottom station with flexible rods serving to accommodate receiving electrodes. Such bottom station, in particular, is described in US 5770945, 1998 or in GB 2402745, 2003. Stations have under the traditional scheme, so that at least three stations were located in areas of potential fields, and some stations were outside.
The disadvantage of this solution is its universalist, namely the inability to carry out exploration at small depths, since the used vertical dipole should have a length not less than a few hundred meters.
Closest to the claimed previously developed by the authors of complex electro-based vessel with a horizontal dipole and ground stations, the United States is x "spits" (EN 53460, 2005). The complex operates as follows. Before setting plants on the bottom synchronize the clocks installed on the generator device and ground stations, then the generator line towed behind the vessel on the sea surface, the excitation of the field exercise alternating rectangular pulses with software asked by duration and duty cycle, with a Suite of multi-channel sediment stations with a uniform pitch along the whole study profile register scan signals in time, recording the potential difference and the spatial derivatives of the electromagnetic field, as in the time of the pulses, and in his absence, and the analysis of signals reflect not only primary but also secondary fields in time and in particular, the features of change of recession, and is defined as the resistance of the medium, and its polarization characteristics upon which to build profiles of the examined area, the anomalies are judged on the presence of hydrocarbon deposits.
However, this solution is not possible to obtain three-dimensional shooting deposits, which reduces the accuracy of the results.
The technical challenge was to create a way marine survey method that can improve the reliability of GPR data by creating opportunities to get inthe works of three-dimensional image deposits in the values of resistivity and polarization characteristics of the environment.
The technical result is achieved due to the fact that at the bottom of the sea line (profile)that overlap the study area, placed at a distance of 500-1000 m from each other benthic station, the position of which is firmly fixed with the help of instruments, resulting profile monitoring (MON). After forming the PN generator vessel is directed through the center of MO, moving perpendicular to the profile observations. In generating the dipole generated electromagnetic pulses, creating a profile of the excitation (PV). The obtained values of the electric field at the receiving electrodes benthic stations in the analysis of parameters related to the middle of the distance between the centers of the generator dipole and the corresponding spacing of the bottom station (point of entry), forming areal system profile measurement (PI), for each of the profiles measurements carried out one-dimensional inversion. On the basis of the received data receive, depending on the shape of the generated current, three-dimensional geoelectric model of the environment in terms of specific resistance or resistivity and polarizability parameters, the anomalies are judged on the availability of deposits, its position in plan and depth. The vessel may conduct studies with a horizontal electric dipole towed on the surface, and vertical or horizontal dipole, buck the dummy at the bottom.
During the formation of ROS are generated depending on the task bipolar rectangular current pulses with a pause between them or harmonic oscillations of current from one or more harmonics. The position of the receiving electrodes on the profile at shallow depths of the sea is controlled by the placement of the GPS system, and at great depths in the system of underwater acoustic binding is controlled by the position of multicomponent seabed stations. When driving the generator vessel on the profile of the excitation control position with respect to the center of the generator dipole according to the GPS end of the vessel and buoy when working with generator dipole towed on the surface, or according to the vessel's GPS system and underwater navigation when working with dipole towed at the bottom.
To increase the number of observations of the actions of the ship repeat repeatedly parallel courses, separated from the original distance, times the length of the spacing of the receiving line, creating several PV and forming several parallel MO.
The General scheme illustrating variants of formation of MO and RO, is shown in figure 1 "a-b", where "a" is work in shallow water in the transit zone, "b" and "C" - deep work with horizontal and vertical dipoles, respectively. It uses the following symbols: 1 - surface buoy 2 - Donne the E. of the station, 3 - receiving electrodes, 4 - generating electrodes, 5 - generator vessel, 6 - terminal buoy generator dipole with plementation GPS, 7 - deepwater apparatus lighthouse-responder system underwater navigation, 8 - marine GPS receiver equipment, o is the centre of the generator dipole.
Figure 2 shows the principle of the formation of profile measurements. For this purpose, the measured values of the electric field on pairs of receiving electrodes benthic stations belong to the middle of the distance between the centers of the generator dipole and the corresponding spacing of the receiving line or bottom station (period of record), forming areal system profile measurement (PI). Conducting one-dimensional inversion for profile measurements, receive, depending on the shape of the generated current picture of the environment in terms of specific resistance or resistivity and polarizability parameters, the anomalies are judged on the availability of deposits, its position in plan and depth.
For example, MO is formed 2N+1 deliveries of the receiver lines in length 2L or the same number of multi-stations located at a distance 2L from each other. Place the origin at the center MONDAY, giving the axis "y" of the profile and the axis "x" on the profile of the excitation. In this coordinate system the position of the centers receiving deliveries (position of bottom stations) on the axis "y" is about regulates values 0; +/-2L; +/-4L;... +/-2NL. If at the beginning of the PV center generator dipole "o" is located at the point with coordinates-2X0, and at the end of the PV at the point 2X1, classifying the entry point to the middle point between the centers of the generator dipole and the corresponding spacing of the receiving line, we get the following coordinates of the begin and end of the profile measurement:
For the 0-th spacing - [(-X0,0), (X1,0)].
For +/- 1 Overspeed - [(-X0,L), (X1,L)] and [(-X0,-L), (X1,-L)], respectively.
For +/-2N1-th spacing - [(-X0,NL), (X1,NL)] and [(-X0,-NL), (X1,-NL)], respectively.
As can be seen from figure 2, the PV offset along the axis of MO in an amount divisible by 2L, increases the number of observations in the Central region of the study area. A similar result can be obtained with the simultaneous formation of several MO.
The above-described technology, received the code name "method of the 3D marine survey method", is implemented as follows.
In shallow water before starting work, using auxiliary boats along the observation profile (MO) receiving lines are arranged so that the receiving electrodes 3 were placed in predefined points of the profile. The position of the electrodes 3 is controlled according to the GPS receiver-indicators. Indigenous all receiver lines are connected to a bottom stations 2 that before putting on the bottom are initialized and synchronized with the clock gene is atomnogo dipole reference signals (e.g., PPS signal of the GPS system). Can be equipped with one or more profiles of the observations. Some stations with receiving lines can be placed at zero depth (Bank).
When working at great depths arrangement of stations along the MO directly with the side of the generator vessel, and their binding is carried out according to the acoustic channel.
After placement of bottom stations (forming PN) generator vessel 5 goes to the starting point of the excitation profile (PV), the direction of which is orthogonal to the direction of MO and passes through the center of one of the spacings MO.
The excitation of the medium is generating a dipole which is towed behind the vessel on the water surface or near the bottom. It can be used as a vertical dipole. One MO can use several parallel PV to increase the number of observations.
Upon completion of the PV is the rise of receiver lines and ground stations on Board information from the bottom stations is overwritten in the on-Board computer for further processing and the whole cycle repeats.
According to the news channel bottom stations and the results of the planned anchor center generator dipole formed profiles measurements.
The obtained results are processed and through simulation retrieves information about change is how resistance and settings induced polarization with depth rocks along all profiles dimensions.
Obtaining three-dimensional geoelectrical medium model reduces the complexity of the research and to improve the accuracy of the forecast.
1. Way marine electrical exploration of oil and gas fields, including the placement of bottom stations in the area of research and the formation of profile observations using mnogorazemny bottom receiver lines, the excitation of electromagnetic fields using generator dipole placed in the zone of location of stations, recording signals of the electric field at the receiving electrodes benthic stations, removing from the stations received information about the changes of the electric field upon excitation of the rock bottom current generator dipole modeling profile of these rocks and making predictions about the presence of hydrocarbons, characterized in that the bottom station is placed on line, the overlapping area of study at a distance of 500-1000 m from each other, and the boat with the generator is conducted perpendicular to the profile through the center of one of the dressing-down profile of observations close to the centre of the study area, and include the results of measurements of the values of the electromagnetic field in pairs of receiving electrodes benthic stations to the midpoint of the segment connecting the centers of the generator is th dipole and the corresponding spacing of profile observations, form of these data areal system profile measurements for each profile measurements carried out one-dimensional inversion and build volume of the geoelectric model of the environment, based on the anomalies of parameters which are judged on the presence or absence of hydrocarbons.
2. The method according to claim 1, characterized in that the position of the receiving electrodes on the profile at shallow depths of the sea is controlled by the placement of the GPS system, and at great depths in the system of underwater acoustic binding is controlled by the position of multicomponent seabed stations.
3. The method according to claim 1, characterized in that when the generator vessel on the profile of the excitation control position with respect to the center of the generator dipole according to the GPS end of the vessel and buoy when working with generator dipole towed on the surface, or according to the vessel's GPS system and underwater navigation when working with dipole towed at the bottom.
4. The method according to claim 1, characterized in that the lifting of the parameters is conducted repeatedly with the movement of the vessel perpendicular to the profile observations on the length, times the length of the spacing of the receiving line, from the original course.
5. The method according to claim 1, characterized in that the excitation of the field exercise bipolar rectangular current pulses with pauses between them.
6. The method according to claim 1, characterized in that the excitation of the I carry the current, consisting of one or more harmonics.
7. The method according to claim 1, characterized in that the profile of the observation form using multi-bottom stations.
8. The method according to claim 7, characterized in that the excitation of the field carry out horizontal dipole towed near the bottom, and the position of its center control system according to underwater navigation.
9. The method according to claim 7, characterized in that the excitation of the field carry out a vertical dipole.
FIELD: physics; measurements.
SUBSTANCE: present invention pertains to geophysical methods of prospecting. An electromagnetic field is generated through generation of a pseudorandom bipolar sequence of packets of periodical current pulses in a transmitter coil. The value of the cross-correlation function is calculated for components (time derivative) of magnetic or electric field and the current form, either with zero-time shift ΔT between time-sequences of the cross-correlation function or without it. From the values of the cross-correlation function with increment, equal to the period of the current pulses, the impulse reaction of the geoelectric medium is determined, which in turn is used to determine the structure of the geoelectric medium. From the difference of impulse reactions on the background and in the absence of primary magnetic field, objects are identified depending on their induced magnetisation. The generator of electromagnetic field has a dc current source, a rectifier bridge, controlled generator of pseudorandom sequences of time intervals, synchronised by a stabilised clock-pulse generator, and a transmitter coil connected to a current sensor. Between the DC current source and the transmitter coil, a current switch is connected, synchronised by a stabilised clock-pulse generator. The generator of pseudorandom sequences of time intervals is connected to the stabilised clock-pulse generator through a frequency divider. In the second version, the transmitter coil generates recurrent packets of current pulses, uniformly distributed according to a random law on the time interval occupied by the packet. In the second version of the device, the current switch is connected to the generator of recurrent packets, randomly and uniformly distributed during pulses, which in turn is connected to the stabilised clock-pulse generator through a frequency divider.
EFFECT: increased accuracy of data from electrical prospecting and reduced labour input.
15 cl, 5 dwg
FIELD: physics; measurements.
SUBSTANCE: present invention pertains to electrical prospecting using an electrical resistance technique. The invention can be used chiefly, for detecting tectonically crushed, water permeable rocks, detection of ore-bearing objects, covered by loose formations, studying the spread of industrially contaminated underground water in the geological environment etc. One supply ground connection is put at infinity. In a well, several supply ground connections are arranged at a given distance from each other. These connections are successively connected to a current source. For each connection, the potential drop between receiving ground connections are measured using a measurement grid. The apparent electrical resistance values are determined from the potential drop values. Isolines for electrical resistance for all depths where the supply ground connections are drawn up. Presence and position of geoelectric irregularities is determined from the layout of the isolines. Within the boundaries of the detected irregular regions, one of the receiving ground connections is moved around the other. The potential drop between them is measured. In the direction of the receiving line, at maximum voltage value, the spread of linear-stretched irregularities or the position of local objects with increased electroconductivity can be determined.
EFFECT: increased efficiency of detecting irregularities in the geological environment.
2 cl, 2 dwg
SUBSTANCE: method for determination of pneumatic puncher deviation angle from prescribed trajectory includes creation with the help of transmitter and transmitting antenna the electromagnetic field oriented along direction of pneumatic puncher movement. At the output of receive antennas signals are extracted which are proportional to electromagnetic field component strength and which are separated using decoupler and alternatively supplied to receiver input where they are detected and amplified. According to difference of these signals the pneumatic puncher deviation angle from prescribed trajectory is evaluated. As transmitting antenna a nonsymmetric dipole is used where pneumatic puncher is long arm and conducting material disk is short arm which disk is connected to it via dielectric disk. Electromagnetic field directional pattern is created in the form of cone in microwave frequency band against electric component. Deviation angle is evaluated according to difference of signal amplitudes at output of comparing device connected by its input to receiver output and by its output - to indicator.
EFFECT: enhancement of efficiency due to increase in accuracy, range capability and interference resistance relative to external natural and artificial noise.
2 cl, 2 dwg
SUBSTANCE: system includes recorder containing multichannel module of analog signal reception and transform; each channel of module includes low-pass filter, analog amplifier and analog-to-digital converter. The system also includes data control and processing module containing interconnected numeric processor, data memory and master microcontroller with program memory. The recorder contains AD converters overload detectors designed as timing units included in numerical processor. The recorder also contains built-in screen and keyboard assembly, connected through data exchange bus to master microcontroller with program memory of data control and processing module. Differential operational amplifiers with controlled input are used as analog amplifiers in channels of module of analog signal reception and transform. The recorder contains comprised in numerical processor timing units computing signal invariable component in channels of module of analog signal reception and transform. The recorder input contains units, comprised in numerical processor timing, computing signal invariable component in channels of module of analog signal reception and transform. Input of each specified unit is connected through data exchange bus to master microcontroller with program memory, and output is connected through digital-to-analog converter to driving input of differential operational amplifier mounted in corresponding channel of module of analog signal reception and transform.
EFFECT: improved accuracy and reliability of received data and enhanced ease of use.
5 cl, 1 dwg
SUBSTANCE: sound vibrations are generated in a pipeline to cause mechanic vibration of metal pipe fittings in the magnetic field of Earth. Electric E and magnetic H components of induced electromagnetic emission, ground temperature and noise level environment in the medium transported by the pipe are measured. Pipeline is located by the maximum of E-H correlation function. Ground temperature indicates leakage. The device includes acoustic oscillator with magnetostriction exciter, and gauge. The gauge consists of a case with indicator of electromagnetic emission characteristics and digital temperature indicator installed in the front panel of the case. Battery-powered receiver of electromagnetic, thermal and acoustic emission with amplifier and comparator is placed inside. The receiver can be connected with remote thermal sensor, sensor of ground acoustic oscillations with built-in antenna receiving electromagnetic emission parameters, and geomicrophone.
EFFECT: simple and highly reliable search; wider functional capabilities.
2 cl, 1 dwg
SUBSTANCE: low-frequency electromagnetic signal is transmitted through the cable. Near the bottom of the water basin, above the cable and across its route, two identical equally oriented systems of magnetic probes tuned to the same frequency, placed at a fixed distance above each other, are moved. At the axis between the magnetic probe systems, a position transducer is placed, used to measure the angle Θ of deviation of this axis from the vertical. Under the lower magnetic probe system, an ultrasonic transducer is placed, used to measure the distance from it to the water basin bottom surface h. The signals from the magnetic probes, the position transducer, and the ultrasonic transducer, are sent to the processing unit. The underwater cable laying depth d is determined using the formula where D is the distance between the magnetic probe systems; α=EL/EU is the ratio of the magnetic field intensity measured by the lower magnetic probe system to the magnetic field intensity measured by the upper magnetic probe system.
EFFECT: increased accuracy and decreased cost.
FIELD: electric geological exploration.
SUBSTANCE: before submergence, clocks installed on the current dipole and the bottom stations are synchronized. The dipole is placed vertically, so that its upper end would be at a distance of no more than 200 metres from the sea surface, and the lower end would be no more than 100 m from the sea bottom (optimally, 20-30 m from the sea bottom). The dipole is excitated with alternating rectangular pulses. The bottom stations are used to record the sweep of the horizontal and vertical field components in time when the current is applied and when it is absent. During signal analysis, the change of primary and secondary fields in time is taken into account and data describing the medium resistance and its polarisation characteristics are determined. The system of equipment includes vessel with a generator and energising field generation unit, which are connected with a vertical dipole with current electrodes, submerged in water, and an onboard data recording and processing unit, using a cable. The system also includes set of bottom stations with horizontal and vertical electrodes and magnetic field sensors. The dipole and the bottom stations are equipped with clocks supporting synchronization.
EFFECT: possibility to obtain data about specific resistance and polarisability of strata during exploration of deep water areas, and provision of more accurate predictions.
3 cl, 1 tbl, 5 dwg
FIELD: technologies for measurement of specific electric conductivity of sea bottom.
SUBSTANCE: the system contains a large number of blocks, each block representing a unit, made with possible positioning in place on sea bottom for measuring horizontal electrical and magnetic fields. To the block unit, a vertically oriented rigid bar is attached and stretched vertically from it. The bar has a pair of electrodes, shifted vertically, which form a vertically oriented dipole antenna. The electrodes are in electric connection with the amplifier positioned inside the unit. Signal from the amplifier is dispatched to data registration processor, which is also positioned inside the unit. By means of the processor, time series of amplified signals of electric and magnetic fields are accumulated over a given time period.
EFFECT: usage of vertical field for measuring transverse changes in the geological structure of sea bottom.
4 cl, 4 dwg
FIELD: measurement technology; specifying cable laying route.
SUBSTANCE: low-frequency electromagnetic signal is transmitted over cable. Two identical sets of magnetic field sensors are disposed at fixed distance from one another above cable, one on top of other. One of sensors in each set is oriented to receive vertical component of magnetic field strength and two other ones, to receive relatively perpendicular horizontal components. Sensors of top and bottom sets are positioned identically to receive horizontal components. Sensors are displaced over cable perpendicular to its route. Levels of resultant magnetic-field horizontal component received by sensors of top and bottom sets are measured. Difference between these levels are calculated. Difference between levels of vertical-component strengths measured by sensors of top and bottom sets are measured. Cable laying route is specified at point where mentioned differences in layers for horizontal and vertical magnetic-field components coincide.
EFFECT: enhanced precision of specifying cable route.
1 cl, 1 dwg
FIELD: technology for finding concealed objects, for example, underground pipelines.
SUBSTANCE: system includes sensor device, having at least two sensors of magnetic field strength vector, positioned in parallel to each other for detecting only distorted magnetic field; device for transformation of direction and value of distorted magnetic field, detected by sensor device, into values for recording and then displaying values in form of letters, digits or graphic symbols; and magnetic marker, formed of magnetic material and attached to cylindrical pipeline. Magnetic marker has upper part and lower part. Lower part has curved structure, such, that center of magnetic material is perpendicular to ground. Polarity of magnetic field is indicated on upper part of magnetic marker.
EFFECT: error-free detection of position, fast attachment of marker to a pipeline, simple measurement of magnetic field.
7 cl, 9 dwg
FIELD: measuring equipment, applicable in agricultural equipment.
SUBSTANCE: the inductance transducer during operation generates interferences which being amplified by an amplifier-filter may cause actuation of the flip-flop and actuator. The maximum interference signal is produced at the instant of passage of the harvester roll weld above the inductance transducer. At this moment the position pickup generates a compensating signal, which is subtracted in the amplifier from the signal of the inductance transducer. Thus, the signal used for comparison with the set point does not contain interferences.
EFFECT: simplified adjustment of the system, enhanced sensitivity, noise immunity.
7 cl, 6 dwg
FIELD: geophysics, in particular, paleomagnetism.
SUBSTANCE: the position of the interfaces formed by inversions of the geomagnetic field is determined by pulse radar detection and ranging of the magnetic field with the aid of radar units with a power potential of 500 to 600 dB. The radiating and receiving devices of the radar units include horizontal magnetic dipoles. The interfaces are separated by comparison of the data of pulse radar detection and ranging of the magnetic field and pulse radar detection and ranging of the electric field.
EFFECT: remote determination of interfaces formed by inversions of the geomagnetic field in ice layers, enhanced depth of survey.
FIELD: geophysical electric prospecting.
SUBSTANCE: method can be used for ac geophysical electric prospecting which current is induced in ground by inductive method; method can be used for searching and prospecting objects as in non-conducting and conducting media. Low-frequency electromagnet field is induced by current running in non-grounded loop onto day surface of Earth. Phase shifts of components of magnetic induction are measured at preset height for parallel profiles relatively vertical component of magnetic induction along profile crossing epicenter of loop and being perpendicular to parallel profiles. Availability of abnormal conducting objects in Earth is determined from structure in phase shifts at the area.
EFFECT: improved precision of measurement; improved efficiency of aerial prospecting.
SUBSTANCE: method comprises generating low-frequency electromagnetic field with the use of ungrounded loop at the day earth surface, measuring Cartesian components of magnetic induction from parallel profiles at given levels, measuring real and imaginary parts of the Cartesian components of the magnetic induction with respect to the phase of the vertical component of the magnetic induction in the epicenter of the ground loop, determining deviations of measured components from the normal values for a homogeneous medium, and determining sections of increased electric conductivity from the sign and magnitude of these values.
EFFECT: enhanced accuracy and efficiency of measuring.
SUBSTANCE: method is based on measurements of electric field, excited using two electrodes. Distanced along supposed subject. Direction of field strength vector is determined on basis of results of measurements of its components in two orthogonal directions. As interpretation parameters value of difference of azimuths of strength vector observed and background, appropriate for homogenous substance, of electric fields, are used. On basis of character of deviation of force lines from background values, presence and position of non-homogenous areas is evaluated and detected.
EFFECT: broader functional capabilities.
FIELD: test equipment.
SUBSTANCE: system for finding coordinates of track and coordinates of defects of underground pipeline has navigation satellites and starting chamber marker. The latter has navigation receiver, processing and mating units, data storage, receiving chamber marker and track marker connected in series. Mentioned markers have marker receiver and navigation receiver connected in series with processing and mating unit, data storage and intra-pipe inspection tool. The latter has flaw detection module, synchronized reference generator, marker transmitter, route detector, computational and control unit, registrar, angular speed three-component meter, three-component accelerator and longitudinal accelerator, on-ground subsystem. Before making starting intra-tube inspection tool started, its sync reference generator is synchronized with time scale of satellite radar system. Data from flaw detector module is recorded into data registrar by means of intra-tube inspection tool, as well as in registrar of three-component angular speed meter, three-component accelerometer, longitudinal accelerometer, route detector, temperature detector and current time detector. Radar parameters and current time are recorded in marker of starting chamber. Radar parameters, time of passing of inspection tool and current time are recorded route markers and marker of starting chamber. Coordinate of pipeline and coordinates of flaws are calculated in on-ground subsystem on the base of stored data.
EFFECT: improved precision of coordinate finding.
FIELD: diagnosis and control.
SUBSTANCE: as source of electromagnetic field of cathode protection of pipeline is used. Depth of position of pipeline axis is determined on basis of magnetic transverse, longitudinal and vertical components of electromagnetic field of current of cathode protection of pipeline. longitudinal electric component of electromagnetic current field of cathode protection is measured and transverse component of electromagnetic field of current of cathode protection on the left and right from pipeline axes. Results of measurements are made normal for depth of pipeline, resistance of environment, surrounding pipeline, current force in pipeline, background components of electromagnetic fields. On basis of heightened values of normal electric components of electromagnetic field of cathode protection current position and size of disruptions of isolating cover of pipeline are detected.
EFFECT: higher efficiency.
FIELD: pipeline construction technologies.
SUBSTANCE: method shows presence and location of defects of metallic pipelines, includes measuring above pipeline in given points during movement of magnetic field vectors in rectangular coordinates, by at least two three-component sensors, tensor of magnetic field gradients is built, by matrix transformation received information is processed, on basis of results background value is estimated and deviations from this value, on basis of difference of which for given criterion value from background value presence and location of defects of metallic pipelines is decided and magnetic graph is built to show location of defects. Device for realization of method has registration sensors system, quartz generator, frequency divider, analog-digital converter, control block, threshold block, sound and light indication block, automatic battery charge indicator, block for calculation of magnetic field gradients, block for showing information, recording device segment, recording control block, situation alignment block, block for satellite absolute geographic alignment GPS, block for selecting recording segment.
EFFECT: broader functional capabilities, higher trustworthiness, higher efficiency.
2 cl, 4 dwg
FIELD: electro-surveying by inductive profiling method, possible use for studying composition of upper part of geological cross-section.
SUBSTANCE: method uses electromagnetic field source and receiving magnetic indicator distanced from one another. Mutual orientation of electromagnetic field source and receiving magnetic indicator is such, that in normal secondary electromagnetic field, excited in radiated geo-electric section without homogeneousness, measured component of magnetic field strength is close to zero. Profiling is performed by means of horizontal displacement relatively to boundary of earth-air splitting simultaneously of source of electromagnetic field and receiving magnetic indicator with discontinuous or continuous registration of abnormal component of magnetic field. On basis of its distribution, presence of geo-electric non-homogeneousness is determined.
EFFECT: increased efficiency and resistance to interference, decreased laboriousness.
FIELD: technology for finding deposits of oil and gas, possible use for finding hydrocarbon resources in carbon rocks of foundation of oil-gas containing precipitation beds.
SUBSTANCE: method includes taking samples from oil and gas bearing area with carbon foundation, adjacent to subterranean continental paleorift. Magnetic susceptibility of these is measured. On appearance of magnetic susceptibility values within range 13,0·106-31,0·106 presence of deposits is determined.
EFFECT: increased precision of finding deposits in carbon rocks of foundation, simplified method, lower costs.