Searching method of gas and gas-condensate deposits

FIELD: oil and gas industry.

SUBSTANCE: invention refers to search of gas deposits, and can be used for finding hydrocarbon raw material in terrigenous rocks of sedimentary cover. Method involves rock sampling from oil-and-gas bearing deposits during boring process. At that slurry sampled from sedimentary cover areas adjacent to or located just above buried continental rift is used as samples; samples are treated with heated 50% salt acid solution, and occurrence of silica jelly-like mass can mean that deposits are available.

EFFECT: improving accuracy of definition of gas and gas-condensate deposits.


The invention relates to the exploration of gas and can be used to detect hydrocarbons in terrigenous sedimentary rocks.

There is a method of detecting oil and gas bearing strata, which consists in determining the indications getcaretpos station appearance of gas in the clay-rich gas coming to the surface in the drilling process (Wadecki JV Drilling oil and gas wells. M.: Nedra. 1978. P.35-36).

However, this method is not possible with sufficient accuracy to predict the approaching oil deposits, since the advent of gas from the wells depends on the breed, which produces drilling.

A known method for predicting oil reservoir, which consists in the selection of rock samples during drilling and measuring their magnetic susceptibility (Grinkevich GI Magnetic survey. M.: Nauka. 1970. S-166).

This method also does not allow accurate approximation to the oil reservoir. This is because the change of the magnetic susceptibility from the depth of the wells is negligible.

There is a method of forecasting the prospective areas for oil and gas, which consists in sampling within the search area, the measurement of magnetic parameters, the heating of the sample up to a temperature of 450-500°, then conducting repeat REGO measurement of magnetic parameters and comparing the measured parameter values before and after heating. By comparing the results to judge the presence of oil or gas. This sampling is conducted from the upper layer of the soil horizon, and the heating is carried out in the presence of an oxidant. In addition, selected background samples and measure their magnetic parameters, and then compare the ratio of the measured parameters values of the samples before and after heating with the value of the background samples. When exceeding the values the relationship more than 2 times judged on the availability of prospective areas for oil and gas. As the magnetic parameters of the chosen magnetic susceptibility, and/or residual saturation magnetization and/or the saturation magnetization. As the oxidizing agent when heated samples using oxygen-containing environment. The method used for the rapid assessment of prospects identified geological structures before setting them deep exploration drilling (see RF patent for the invention №2215309, IPC G01V 9/00).

However, this method is not applicable for the prediction of hydrocarbon deposits in deep-lying rocks of the basement.

Closest to the proposed solution is a way of finding hydrocarbons, which is that they select samples from oil and gas bearing areas with carbonate basement, adjacent to the buried continental paleorift. Measure their magnetic in preemtively. The emergence of the values of the magnetic susceptibility in the range of 13.0·106-31,0·106 judge available deposits (see RF patent for the invention №2276390, IPC G01V 3/08).

However, this method is rather complicated.

The objective of the invention is to improve the accuracy of deposits of gas and gas condensate, to a lesser extent oil, terrigenous sedimentary rocks while simplifying and reducing costs.

The problem is solved in that in the way of finding gas and gas condensate deposits, consisting in the selection of rock samples (sludge) in the process of drilling and processing them with hydrochloric acid, the reaction products of which are judged on the availability of deposits. According to the invention samples terrigenous rocks away from oil and gas bearing areas of the sedimentary cover, adjacent to or directly above buried continental rift, identify development zone laumontite (zeolite) terrigenous sequences of the cover by the emergence of a gelatinous mass of silica (a product of the interaction heated to 50% HCl solution and laumontite), which is judged on the presence of deposits.

The method is implemented as follows.

Within the boundaries of hydrocarbon deposits, concentrated in the sedimentary cover and localized in the fossil paleorift, being processed sludge terrigenous rocks of 50% solution of hydrochloric acid, heated to the temperature of 40°C. Highlighted the depth intervals where the sludge gelatinase, i.e. formed a gelatinous mass. Identify such anomalies with zones neftegazonosnyh (gascondensate-saturated) Sandstone reservoirs of the sedimentary cover, where required tests wellbore at a flow rate of gas, gas condensate and oil.

In terms of the buried paleorift, experienced tectonic-hydrothermal activation, hot fluids, can cause romanticization and calcidiscus, penetrated along the faults in the rocks of the sedimentary cover. They not only metasomatic processed them, but was redistributed hydrocarbons from oil and gas source rocks. In the end, there arise saturated gas, condensate, less oil lamentatione terrigenous complexes, passing in calcitization breed (screens). The combination of saturated hydrocarbon reservoirs and seals is a natural reservoir, the detection of which in the oil and gas areas is extremely important.

The method allows the direct testing of wells, install new prospective for hydrocarbons sections of the sedimentary cover, paired with paleorift, and to anticipate emergency well construction: breakage of the equipment, emission of gas at abnormally high formation pressure, etc.

How POI is ka hydrocarbons, consisting in sampling breed with bearing areas in the drilling process, characterized in that as the samples chosen by cuttings, which are taken from areas of the sedimentary cover, adjacent to or directly above buried continental rift, samples are treated with hot 50%solution of hydrochloric acid, and the presence of deposits is judged by the appearance of gelatinous mass of silica.


Same patents:

FIELD: mining.

SUBSTANCE: invention refers to protection of environment, particularly to aspects of ecological safety and can be implemented at construction and at development of minerals near active volcano. The method of reduction of dynamic effect of a volcano to environment during eruption includes complex of research in corpore. There is determined a probable hypocenter of an earthquake and probable term of volcano eruption, the depth of bedding and intensiveness of the block system of support zone, the depth of magma collection zone and zones of its probable melting. On the base of received data a loose zone is formed on the slope of the volcano under a crater plug; also depending on a relief of area, on the depth of magma collection zone and on depth of support zone boreholes are drilled from the surface or from a gallery led for this purpose to the center of the volcano. Boreholes are used for preliminary slackening of mountain massif at the first stage by hydraulic break, and at the second stage of mountain massif slackening by leaching. Upon creating a loose zone magma withdrawal channel is formed by the method of directed explosion.

EFFECT: decreasing undesirable consequences of catastrophic volcano activity due to transforming volcano eruption character from violent volcanic into tranquil outflow of liquid lava.

1 dwg

FIELD: physics, measurement.

SUBSTANCE: inventions are related to the field of seismology and may be used for warning about tsunami waves. Device that realises suggested method comprises surface station for reception and processing of signals, communications satellite - retransmitter, radio buoy and registration device. Method is realised in the following manner: groups of registration devices are installed in coastal area, connected to surface stations for reception and processing of signals. High-frequency oscillation is generated on radio buoy and manipulated by phase with the help of modulating code. Generated complex signal with phase manipulation is amplified in power and radiated into environment. On surface station for reception and processing of signals received complex signal with phase manipulation is transformed by frequency. Complex signal with phase manipulation is separated on intermediate frequency, and its phase is doubled. Spectrum width of received signal with phase manipulation of intermediate frequency and its second harmonics is measured and compared. In case of significant difference, synchronous detection of received signal with phase manipulation of intermediate frequency is done. Low-frequency voltage is separated, which is proportional to modulating code, and it is registered. At that reference voltage required for synchronous detection of received signal with phase manipulation of intermediate frequency is generated by separation of the second harmonics of received signal with phase manipulation of intermediate frequency, by division of its phase by two and separation of harmonic voltage of intermediate frequency. Judgement on extent of tsunami danger is made whenever radiated signal has exceeded three threshold levels: "dangerous", "very dangerous", "extremely dangerous".

EFFECT: higher validity of detection.

2 cl, 6 dwg

FIELD: physics; mining engineering.

SUBSTANCE: system contains hermetic enclosure with attached seismic vibration receiver and distributed mass pendulum, optoelectronic sensor of preset limit pendulum deviation. Pendulum consists of optically matched coherent light source and photodetector connected through photocurrent amplifier and frequency meter to alarm initiating detector. Optoelectronic sensor is represented with signal and reference fibre coils, optically connected through coherent light source and photodetector to interferometer. Herewith signal and reference fibre coils are embedded in the enclosure mounted on sea-bed, while coherent light source and photodetector are arranged in above-water control and record centre. Alarm initiating detector is designed as a transmitter provided in above-water control and record centre, satellite transponder and terrestrial station. Transmitter represents modulation code generator, phase-shift modulator, high-frequency generator, power amplifier and transmitting antenna. Terrestrial station consists of receiving antenna, high-frequency amplifier, mixer, heterodyne, intermediate-frequency amplifier, phase-shift keying signal demodulator, registration unit, audible warning device. Phase-shift keying signal demodulator contains delay line, the first, second and third adders, the first and second amplitude detectors, phase inverter.

EFFECT: higher reliability of system.

3 dwg

FIELD: geophysics.

SUBSTANCE: invention is related to procedure of global geophysical events monitoring and prediction of emergence and development of natural and anthropogenic disasters on Earth. System comprises space segment and surface segments. Space segment consists of three orbit groups. In orbit group of small spacecrafts (SSC), which are located on geostationary orbit, SSC that are combined into two orbit groups of three satellites on tops of two triangular planes, create constellation of six tops. For orbit group that consists of 3-4 SSC on sun-synchronous orbits with height of 600-700 km, orbit planes are evenly distributed along longitude of ascending node. In orbit group of 50 microsatellites (MSC - micro-spacecrafts), the latter are located mainly on sun-synchronous orbits and partially on geostationary orbits. Highly sensitive equipment is installed on SSC and MSC with complex of instruments for measurement of foreshocks and sensors of operational control and prediction of natural and anthropogenic disasters.

EFFECT: system that provides automated aerospace monitoring of global geophysical natural and anthropogenic disasters, makes it possible to obtain operative short-term forecast - warning hours and days before.

10 cl, 9 dwg

FIELD: transportation.

SUBSTANCE: present invention pertains to air-borne systems, using remotely controlled aircraft for such purposes as tactical intelligence, aerial mapping, monitoring oil and gas pipelines and electrical power lines. The air-borne system of probing the earth's surface comprises a remote control radio channel using noise-like signals, system for space orientation and determination of current coordinates of an object using conjugated inertial and satellite navigation systems. Signals of the satellite navigation systems are received by three small antennae of a satellite navigation system, located in one plane, arranged in space at 120° from each other. For easier control, the operator is oriented in the system of processing and imaging radio telemetry, which is an understandable and convenient system of displaying digital and graphical information on the screen of a personal computer.

EFFECT: provision for a noise resistant, secret channel for wireless control of remotedly controlled aircraft, determination of space orientation of the object from signals of satellite navigation systems GLONASS/GPS for manual control outside the visibility zone.

4 dwg

FIELD: physics; mining.

SUBSTANCE: ascending SHF-radiation of the Earth is received by an instrument, installed on the space vehicle, on two mutually orthogonal polarized reception channels. The beginning of change in radiation polarisation in reception channels is recorded along with its variation all along the flight path. Note here that reception is executed by two spiral aerials of the LH and RH directions of polarisation rotation. A difference between polarisations in reception channels is extracted with the help of phase detector. Note here also that the second reception channel signal shifted in phase through π/2 makes the reference signal for aforesaid phase detector. The earthquake seismic hypocenter is compared with a point of the record graph maximum curvature. Record graph curve (l) length variation is recorded for consecutive space vehicle orbits above and over the zone of expected earthquake and time constant (T) of the rate of variation of aforesaid length is determined. Now, the probable time and magnitude of the earthquake is forecasted.

EFFECT: increase in forecast accuracy.

5 dwg

FIELD: physics; geophysics.

SUBSTANCE: invention is related to methods for prevention of uncontrolled - avalanche-like volcanic eruption and organisation of controlled magma transport for its use in construction. According to method, pressure is controlled in secondary magma pockets under volcanos that exhibit solfatara activity. For this purpose channels are drilled slantwise in the base of secondary magma pocket. Compressed gas is supplied to this pocket. Pressure is increased in secondary magma pocket, and magma supply from primary pocket is slowed down. At that magma accumulated in secondary magma pocket is extracted and transported for construction through drilled channels. At that critical pressure of avalanche-like eruption is avoided.

EFFECT: higher efficiency of method.

FIELD: physics; measurement.

SUBSTANCE: invention is related to the field of seismology and may be used in national systems of seismic control for short-term prediction of earthquake. Detector comprises channel for reception of polarisation of light flux reflected from underlying surface, and route for signal processing. The following components are serially connected into reception channel: lens, depolarisator, amplifier, peak detector, threshold device, analog-digital converter, unit of buffer memory, and also separate generator of sawtooth voltage. At that sawtooth voltage is connected to plated liners of depolarisator.

EFFECT: higher efficiency and validity of foreshock detection.

6 dwg

FIELD: physics; measurement.

SUBSTANCE: invention is related to ecological geophysics, in particular, to methods for monitoring of aerogenic contamination of environment. Snow samples are taken in points that are located at the distance of more than 30 m from anthropogenic objects. Samples are melted, hard fraction is obtained by means of filtering. Amounts of every metal are determined in hard fraction. Values of load are calculated, which are created by supply of every metal into environment, then they are compared to background values, and total indices of load ZP are calculated. Besides, differential magnet filters are measured with deposited dust fraction. Values of magnet load are calculated, compared to background values. Coefficients of relative increase of magnet load KPM are calculated. Representative sample with size sufficient for statistic analysis is made from total combination of kPM values. In filters that are related to sample, amount of every metal is defined by method of atomic emission spectrometry with inductive-bound plasma. Regression analysis of dependence is carried out between KPM and ZP values in sample. Regression equation of ZP per KPM is found, which is used to calculate ZP values for the whole combination of KPM values.

EFFECT: higher reliability.

6 dwg

FIELD: physics; measurements.

SUBSTANCE: present invention can be used in the field service for warning against tsunami waves. A detector is placed in the coastal area at a distance of 2-5 thousand kilometres from the shore. From the detector signals, the hazard level of the tsunami waves for the protected area is determined. A high frequency oscillation is generated on a radio buoy. Its phase is manipulated using a modulating code, containing information on the direction of propagation and hazard level of the tsunami waves for the protected area. The power of the generated complex signal with phase manipulation is amplified. The signal is broadcast with time interval determined by the hazard level of the tsunami wave for the protected area. At the ground station for receiving and processing signals, the frequency of received complex signal with phase manipulation is transformed. Its phase is doubled. The spectral width of the received signal with phase manipulation at an intermediate frequency and its second harmonic are measured. The results are compared, and if there is a considerable difference, synchronous detection of the received signal with phase manipulation at the intermediate frequency is carried out. Low frequency voltage is selected, proportional to the modulating code, and recorded. The reference voltage, necessary for synchronous detection of the received signal with phase manipulation at the intermediate frequency, is generated by selection of the second harmonic of the received signal with phase manipulation at the intermediate frequency, dividing its phase by two and selecting the harmonic voltage at the intermediate frequency. If the transmitted signal exceeds the three threshold values: "dangerous", "very dangerous", and "extremely dangerous", the tsunami is assigned the corresponding hazard levels. The harmonic voltage at the intermediate frequency, used as a base signal for synchronous detection of the received signal with phase manipulation at the intermediate frequency, before transmitted to the reference input of the phase detector, undergoes frequency detection. Short heteropolar pulses are selected, corresponding to moments in time when the phase of the reference voltage changes sharply from one state to another. These pulses are used for generating the control voltage. The pulses are affected by the phase of the reference voltage, which is stabilised in one state and the back-to-back effect is eliminated.

EFFECT: increased accuracy of obtained data.

2 cl, 5 dwg

FIELD: mining.

SUBSTANCE: device contains receiving chamber for samples, pump, communicating with chamber, pressure measuring device, communicating with sample and optical analyser, optically connected with sample; device and analyser facilitate pressure drop in sample and determine pressure which provides extremum of light amount passing through sample.

EFFECT: preventing precipitation of hard substances and bubbling during sampling.

19 cl, 27 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention refers to transporting samples of fluid mediums and/or rheological measurements to surface of division. According to one of versions the method consists in circulating heated fluid medium in the first region of the reservoir bed wherein a composition of heavy oil is present or considered present with implementation of a pump assembled on the surface and an installation for well completion containing a well pump and a sampling tool within the period of time and at consumption adequate for obtaining fluid composition of heavy oil; then sampling of fluid composition of heavy oil is performed by means of the sampling tool.

EFFECT: facilitation of sampling from reservoir bed by means of device or its part used for supply of heat into reservoir bed region in question.

20 cl, 14 dwg

FIELD: mining.

SUBSTANCE: method consists in pumping-out fluid from rock with pump assembled in well and in measuring fluid pressure and volume during pumping out by means of sensors arranged in well. Also during pumping out the pumped out volume is registered, rate of fluid inflow is evaluated on the base of measurements of pressure and volume and such rate of fluid pumping out is set that facilitates flowing of fluid practically in one-phase state.

EFFECT: determination of quality and structure of stratum fluid.

24 cl, 20 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention refers to downhole analysis of underground bed. Specifically invention refers to sampling through perforations in well bore leading to the underground bed. Method and device for caving reduction in perforation formed in well bore and leading from well bore to underground bed are offered. The well bore contains the device body with the lever moving forward. The perforation contains one or more caving block units mounted by using the lever. Caving block unit is designed so that to prevent caving from base fluid to the body through perforation.

EFFECT: reduced contamination of base fluid.

31 cl, 20 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention refers to subsurface sampling and specifically to continuous measurement of concerned parameters, as well as hydrocarbon sample analysis performed on sampling point after installed in sampling chamber of the downhole device. The device contains downhole sampling chamber for formation fluid sample and control module connected by fluid channel to a part of formation fluid sample in downhole sampling chamber and designed to control concerned parameter of formation fluid sample. Besides method for controlling concerned parameter of formation fluid sample is offered.

EFFECT: provided continuous control of sample integrity including sample surfacing to its delivery to analysis laboratory.

23 cl, 4 dwg

Subsurface sampler. // 2347906

FIELD: oil and gas industry.

SUBSTANCE: invention is applicable to the oil industry and particularly to equipment used for formation testing in oil production. The sampler consists of a cylindrical housing containing a sampling module that includes a flow-type sample receptacle, valve gear, and magnetic separator strainer; hydraulic drive module including a cylindrical chamber, ballast chamber, piston, push rod, and solenoid valve; electronic module including power supply unit and set of physical metering sensors connected with an electric recording circuit. The solenoid valve is located inside the piston of the hydraulic drive module; the sampling module is additionally fitted with a sealed chamber with one end connected to the rod and the other end connected to the valve gear; and the electronic module is additionally fitted with a piston proximity sensor.

EFFECT: better quality of information measured, as well as simplified and more reliable operation of mechanism components.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil and gas industry and can be used for well development, oil and gas influx intensification and waterproofing. Method of oil and gas influx development and intensification, well waterproofing procedure involves trip in hole of packer device body to shooting depth thus using external producing strings. Thereafter parker is installed and pressure tested for air-tightness. Central tubing row is racked and pressed. Working fluid is supplied with formation fluid pumping-out, while mixed fluid is supplied from well to surface through annular space. Annular space is fitted with external and central tubing rows. The device contains the body with pressure valve arranged between external radial channel and the channel connecting coaxial channels of jet pump nozzles and return valves. The body accommodates flushing pass hole, gallery and radial external and internal channels for fluid receiving and removal, jet pumps with diffuser. Each jet pump is in addition supplied with upper return valve arranged in longitudinal channel over diffuser. To activate jet pumps of the device, working fluid is supplied through pressure valve through annular space formed between flow string and external tubing row.

EFFECT: higher reliability of the device and reduction of well development time.

3 cl, 9 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention is related to oil and gas industry, in particular, to procedure of fluid and gas sampling in wells. Device consists of cylindrical casing, where the following components are installed: sample receiving chamber of suction type with separating piston, ballast chamber, module of control and information exchange interface. The following components are introduced into cylindrical casing between sample receiving and ballast chambers, leakproof relative to environment, serially connected downstream sample receiving chamber: uncontrolled adjustable reduction gear of fluid pressure and hydraulic relay controlled by electric current that is supplied from module of control and information exchange interface, which uses elastic mechanic oscillations excited on device body and noise-immune coding of information for control of device operation, and also for communication to personal computer.

EFFECT: increase of device operation reliability, monitoring of sample receiving chamber opening and time of its filling with fluid, expansion of equipment operation thermobaric range, provision of sample transport safety.

5 cl, 1 dwg

FIELD: physics; measurement.

SUBSTANCE: present invention pertains to geophysics, in particular to geophysical methods of surveying wells, for detecting gas-bearing formations and can be used in reservoir management of hydrocarbon deposits. The method of detecting gas-bearing formations in wells involves measurement of the natural acoustic field along the axis of the cased column of the well in three or more given frequency bands and drawing graphs based on the measurement results. The natural acoustic signals are measured using two orthogonally placed sensors, the axes of detection of which lie perpendicular to the wall of the well. The amplitude levels of acoustic signals and their ratios are evaluated. If the amplitude of acoustic signals in the highest frequency band exceeds amplitude values in the lowest frequency band, and the ratio of acoustic signals from two sensors at the highest frequency is not equal to one, then gas-bearing formations are present. The depth intervals of the gas-bearing formations are determined from the maximum level of acoustic signals recorded at the highest frequency and maximum deviation of their ratios from one on the graphs.

EFFECT: increased efficiency and reliability of detecting gas-bearing formations in cased wells.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention relates to devices for sampling of horizon fluids from gas and oil wells at specified depth. The technical result is achieved in the mechanism of valve control by means of the following: in a case with a bushing and a plunger with holes for a calibrated pin positioned therein the mechanism is additionally equipped with a device in form of a cartridge located in the case of the mechanism above the bushing and interacting with the upper part of the plunger equipped with sealing rings insulating a cavity of the cartridge placed above the upper part of the plunger.

EFFECT: upgraded reliability and quality of sampling at any horizon conditions including aggressiveness of horizon and also possibility of operation of mechanism valve control with majority of employed types of samplers.

1 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes picking a sample of bed fluid under pressure by means of pump. Sample of fluid is then compressed by moveable piston, actuated by hydrostatic pressure in well through valve. Compressed sample of bed fluid is contained under high pressure inside the chamber with fixed volume for delivery to well surface. Moveable piston is in form of inner and outer bushings, moveable relatively to each other. At the same time several tanks for picking samples from several areas may be lowered into well with minimal time delays. Tanks may be emptied on well surface by evacuation pressure, to constantly provide for keeping of pressure of fluid sample above previously selected pressure.

EFFECT: higher reliability.

6 cl, 14 dwg