Method for determination of oil-filled formations
FIELD: oil and gas industry.
SUBSTANCE: bore core is selected and examined, induction logging and induced gamma-ray logging or neutron-neutron logging is made and log curves are analysed for the roof of production tier. At that formations with apparent resistivity are identified with values less than 6-8 Ohm/m during induction logging and against values at curves of induced gamma-ray logging or neutron-neutron logging making less 85% and less than values of lower formations. Among these formations it is necessary to select strata without loamy lintels and strata of carbonate oil-filled formations and values of apparent resistivity not less than 15 Ohm/m against data of induction logging. Then sedimentary types for the selected formations is defined and if oil-saturated sandstone is present then conclusion is made about terrigenous origin of these formations. Then values are specified for porosity coefficient, permeability and oil-saturation coefficients and when lower limits for this region are exceeded the indentified formations will be referred to productive formations.
EFFECT: increase of operational efficiency during installation of the bottom-hole complex, improvement of level of detail and authenticity of GIS data for identification of geological rating for rock masses.
The invention relates to the oil industry and can find application in the determination of oil-saturated formations in the borehole.
There is a method of determining the composition and oil and gas terrigenous rocks collectors and definitions estimation parameters based on the processing of data for different geophysical borehole sections (GIS), including the selection in the well section of the reservoir intervals, determination of their effective thicknesses, clay content and nature of the distribution of the clay material in the rock (dispersed, structural, laminated), full and effective porosity, absolute and relative permeability, evaluating oil and gas and composition extracted from hydrocarbon breed fluids, determining the displacement efficiency of oil and gas from reservoirs ("guidelines for the definition of the estimation parameters for oil and gas deposits on materials GIW with the inclusion of the results of core analysis, sampling and testing of productive layers", Ed. Boundaryscan, Vfraser, Gel, helenin, NGO "Southfromjersey", 1990, 261 S.).
The known method is implemented in accordance with the "Instructions for use materials geophysical study using the results of the study of the core and test wells to determine and justify estimation parameters for oil and gas deposits", Moscow, VNIGNI, 1987, 20 C.) and allows to determine the geological characteristics only pre-allocated in terms of the well layers of the reservoir used in the processing of readings logging for certain breeds of private collectors theoretically informed empirical petrophysical models and stochastic petrophysical relationships established on the basis of the studies taken from wells in the intervals of occurrence of rocks reservoir cores sample and analyze the relationships type core-core, core-GIS and GIS-GIS.
The known method has limitations when determining geological properties of rocks in the borehole, is used only to define the parameters of rocks reservoir and does not provide a definition of full structural-mineralogical and fluid models of the breed, and does not implement the evaluation of the geological characteristics of the rock of non-reserves in the borehole.
Closest to the invention to the technical essence is a method of determining geological properties of terrigenous rocks in the near-well space on GIS data, including the execution of geophysical surveys in the borehole and processing the received information identifying intervals collectors and assessment of their geological properties (Usagencies, Gashora, Vhuteine. The method of assessment is istoty and composition of the sand-aleurolite-clay rocks on geophysical data. Oilfield Geophysics. Issue 5. Ufa, Bashneft, 1975, p.88-94 - prototype).
There is a method allows to determine the porosity, composition and saturation Sandstone-siltstone-shale reservoirs. The method is based on the use of data processing GIS petrophysical models that take into account the impact on the values for the different methods of GIS high content in the skeleton of rock silt material and clays having different distribution (dispersed, structural, layered) in the array of the breed. During processing of GIS data to determine the coefficient of porosity, content of sand, silt and clay fractions in the skeleton of the breed, as well as the ratio of total water saturation of the rock.
The disadvantage of this method is that it is focused on the study of the properties only pre-allocated in the borehole of reservoirs and uses when processing evidence logging simplified theoretical and stochastic petrophysical models can be applied for approximate evaluation of the geological properties of rock collectors.
The objective of the invention is to increase the detail and accuracy of the determination according to the GIS geological characteristics of the rock composing the terrigenous column - definition of oil-saturated layers.
The problem is solved by the method definition wide-angle the oil reservoirs, according to which analyze log curves holes in the roof part of the productive layer, reveal layers with facile specific resistance in induction well logging (IR) of no more than 6-8 Ohm·m and indications on the curves of the neutron gamma ray (NGR) or neutron-neutron logging (NOC)of 85% or less from the values of downstream reservoirs, among the identified seams choose layers without clay jumper with layers of carbonate-saturated rocks and with the values of apparent resistivity on IR not less than 15 Ohm·m, precise lithological composition of the identified layers, when present in the composition of the rocks oil-saturated Sandstone conclude terrigenous origin of these layers, precise values of porosity, permeability and oil saturation, when exceeding the lower limits of porosity, permeability and saturation petrophysical factors for this region revealed the layers referred to as the productive.
When interpreting geophysical material having problems explaining the relatively low readings induction logging (6-8 Ohm·m) roofing part of the tournaisian tier with capacity of reservoir rocks 1-4 m below which is followed by the difference between carbonate-saturated rocks without clay lane the sliver between the layers with specific resistance, exceeding 15-20 Ohm·m
The problem is that carbonate rocks (limestone aquifer) at values of apparent resistivity on IR equal to 6-8 Ohm·m, belongs to the aquifer, and they are located above the oil-bearing strata. In between there is no insulating clay layer or interlayer, i.e., no clay jumper between layers. It turns out that below the limestone aquifer without insulating clay jumper immediately are oil-bearing limestone. This contradicts the model of oil deposits, according to which aquifers should be below the oil.
Above the oil-bearing limestone directly without the jumper be placed aquifer limestones or sandstones can't, due to the greater density of produced water compared to oil. Less dense oil due to gravitational distribution is placed above the reservoir water, as if POPs up.
The explanation of this paradox lies in the following: littp rocks with a resistivity of 6-8 Ohm·m, occurring in the oil-bearing limestone, refers to the oil-bearing terrigenous rocks (sandstones).
Description roofing (abnormal) part of the tournaisian tier shows the lowest readings curves COG or NOC compared to the underlying oil-bearing limestone (15% and is more). Such formations are widespread on Fedotov square Novo-elkhovskoye deposits in areas of erosion valleys visean age tournaisian deposits of the tier.
Choosing the right lithotype collector when interpreting will allow you to correctly determine the petrophysical parameters (porosity, permeability, clay content, saturation, and thereby increasing oil reserves and to involve them in the design. So, at the same testimony neutron gamma logging COG-60 porosity quartz Sandstone greater than the porosity of the limestone by 4-5%. This means that when determining the coefficient of saturation by the formula Archie greater coefficient of porosity at the same electrical resistivity of the layer will correspond to a larger value of the coefficient of saturation.
When the porosity coefficient of 9% and electrical resistivity of 15 Ohm·m by the formula Archie oil saturation factor of limestone tournaisian tier Novo-elkhovskoye field is 55%, this is the lower bound for the industrial-productive formations.
Oil saturation factor (KN) of the reservoir is determined by the well-known formula Archie:
where C is the proportionality coefficient equal to:
a, b, m, n - coefficient is eciency, defined core;
Knm/nis the coefficient of porosity formation in degreem/n.
Rn1/n- the electrical resistivity of the investigated layer degree1/n.
In the laboratory defines the electrical characteristics of core samples - parameter porosity RP and parameter saturation PH:
where R - electrical resistivity of the investigated layer in Ohm·m,
R - resistivity layer with videosystem in Ohm·m
R- the electrical resistivity of formation water in Ohm·m
Criteria emisions in oil in the roof part of the tournaisian tiers are as follows:
1. Induction logging. Readings 6-8 Ohm·m without the Underlying clay or compacted jumpers oil carbonate reservoirs (limestone) have this method electrical resistivity of more than 15 Ohm·m
2. Neutron methods (neutron gamma-ray logging or neutron-neutron logging. Readings roof is less than 15 percent or more compared to the underlying carbonate column.
3. Nuclear magnetic resonance logging. An index of free fluid in the reservoir, as well as in the underlying saturated carbonate rocks. That is, the reservoir and test the AI can give is contained in the pore fluid.
4. Confirmation coring terrigenous origin lithology and the nature of saturation (i.e. saturation) layer deposited without the jumper in the roof part of the tournaisian stage in two or three wells in the specific area of developed deposits of oil. When the core analysis are defined: lithology, porosity, permeability, clay content, oil and water saturation of the selected strains.
5. Calculated coefficients of porosity, permeability, clay content, the saturation on petrophysical algorithms based on terrigenous origin roof of the reservoir. When confirming the values calculated petrophysical parameters (i.e., at the close of convergence) with the data analysis of core and exceeding their largest boundary values of the coefficients for the region concludes that the roofing part of the tournaisian tier posted productive sandstones.
In well No. 1 Fedotov square Novo-elkhovskoye field according to hydrodynamic research roofing tournaisian layer is defined at a depth of 1009,7 m
Data for well 1 are shown in table 1
In the roof part of the tournaisian stage in the interval 1009,7-1011,6 m, according to geophysical research with vain (GIS), located carbonate reservoir with porosity of 16%, oil saturation 52% (according to table No. 1 this stratum is not productive value of the coefficient of saturation) and the specific resistance of 6 Ohm·meters Below, in the interval 1011,6-1027 m is a carbonate oil reservoir with porosity 10,8%, oil saturation 71,3%, a resistivity of 19 Ohm·m According to Kern, the interval 1009,7-1011,6 m the oil-bearing sandstones. Calculated values of petrophysical parameters of reservoir sandstones in the interval 1009,7-1011,6 m according to the standard interpretation of GIS. The obtained values: the ratio of the porosity of 20%, the coefficient of saturation of 62%. I.e. the collector in the roof part of the tournaisian stage in the interval 1009,7-1011,6 m when properly determining lithology pass from the category of unproductive by the coefficient of saturation (the ratio of the saturation - 52%) in the category of productive (coefficient of saturation - 62%).
When calculating the carrying amount and recoverable oil reserves in this Deposit got the following data.
Collector carbonate (limestone). Initial reserves 80028 t, initial recoverable reserves 18406 t, the recovery factor of 23%.
The terrigenous reservoir (Sandstone). Initial reserves 133 380 t; initial recoverable reserves 66690 so the oil recovery Factor of 50%.
I.e. after the application of the proposed method when properly determining the lithology of the reservoir recoverable oil reserves increased by 48284 t, and the recovery factor of oil increased by 27%.
The application of the proposed method will allow you to identify previously undetectable oil-bearing stratum.
The method of determination of oil reservoirs, according to which, in well selected and examined Kern, conduct induction logging and neutron gamma or neutron-neutron logging, analyzing log curves holes in the roof part of the productive layer, reveal layers with facile specific resistance for induction logging no more than 6-8 Ohm·m and indications on the curves of the neutron gamma ray or neutron-neutron logging, constituting 85% or less from the values of downstream reservoirs, among the identified seams choose layers without clay jumper with layers of carbonate-saturated rocks and with the values of apparent resistivity for induction logging is not less than 15 Ohm·m, precise lithological composition of the identified layers, when present in the composition of the rocks oil-saturated Sandstone conclude terrigenous origin of these layers, precise values of porosity, permeability and oil saturation, when exceeding the lower limits of porosity, permeability and saturation petrophysical factors for this region revealed the layers referred to as productive.
SUBSTANCE: in order to select the point of location and structure of a well, magnetotelluric investigations and seismic investigations while detecting shear waves in order to determine the structure of the subtrappean space are performed first. Further, results of investigating the core material are used to determine the lower edge of the trapp, and results of well investigations and VSP-OVP in a system with results of seismic investigation by shear-wave technique are used to search for hydrocarbon deposits.
EFFECT: high accuracy of surveying geological environments in a sedimentary reservoir covered by a trappean cover.
SUBSTANCE: bottom station consists of a tough case (1) in form of a sphere. In the bottom part, the case (1) is linked to a ballast (2) by a disconnector (3) with strops (4). Outside the case there is a seismic sensor (7) and a module of electromagnetic sensors which consists of two magnetic field inductive sensors (5) and two electric field sensors (6). In the top part of the case (1) there is a buoyancy module (9) in a hollow space (8). The case houses a power supply (10), sensor (5, 6, 7) signal recorders (11, 12, 13), a device for storing the recorded information (14), a hydroacoustic communication channel (15), a control unit (17), a logic processing unit (18), a sensor for spatial orientation and determining coordinates (19). The hydroacoustic communication channel (15) is connected to an antenna (16). The magnetic field inductive sensors (5) and electric field sensors (6) have a detection range of 0.0001-300 Hz and a detection period of 0.033-10000 s. The seismic sensor (7) enables to measure the vertical component of the seismic field in the 0.5-40 Hz range.
EFFECT: high reliability of detecting magnetotelluric field signals.
SUBSTANCE: disclosed is a geophysical survey method for media with an acoustic hard layer in the overburden of a geologic profile. The method involves detection of seismic waves refracted on or reflected from the cover of the hard layer. In addition to seismic survey, the disclosed method involves detection of the gravitational field along seismic profiles. Gravitational anomalies are detected within this field and the position of vertical contacts lying within the hard layer are mapped based on the gravitational anomalies. Correlation relationships between seismic velocities and densities are used to determine density of sections of the hard layer separated by contacts and the capacity of the sections of the hard layer, from which the position of the bottom of the hard layer is determined, is determined by solving the inverse gravimetrical problem. The value of seismic velocity, determined in the hard layer using known seismic survey methods, as well as the capacity of the layer determined using the disclosed method based on gravitational data, is entered into a seismic model used to image the medium by migration of seismic waves reflected from boundaries lying under the hard layer.
EFFECT: high reliability investigating deep reflecting seismic boundaries by taking into account the effect of high-speed non-uniformities of the top part of the section.
2 cl, 3 dwg
FIELD: measurement equipment.
SUBSTANCE: power, frequency, phase, time and polarisation parameters of physical fields of an offshore facility are measured. Measurements are carried out using a measuring system operated from an on-line computer, which is at a fixed direction-finding bearing, angle of place and distance in relation to the investigated offshore facility. The measuring system is lifted and supported at the elevation by means of an aerolifting device. The aerolifting device is based on the offshore facility moving along the perimeter of the investigated facility.
EFFECT: simpler technology.
2 cl, 2 dwg
SUBSTANCE: during geophysical survey of a plurality of wells, logging data are obtained in form of relationships of change in specific parameters on the depth of each of the plurality of wells. A triangulation network is constructed on said plurality of wells. Automatic correlation is carried out for each pair of neighbouring wells on the triangulation network using at least some of said relationships. Automatic correlation results for the wells in each triangle of the triangulation network are compared in order to detect mismatches. Triangles in which the mismatch value as a result of correlation exceeds a predetermined threshold are selected. Correlation results are corrected in the selected triangles by making interactive changes to the correlation results of corresponding pairs of neighbouring wells. At the step of comparing correlation results, mismatch values at each depth are separately taken into account in the given triangle. At the step of selecting triangles, depths at which said mismatch values are maximum are selected. At the step of correcting correlation results, correlation results at the selected depths are corrected. The relationships of changes in specific parameters used are the relationships of changes in parameters from a group consisting of the following: spontaneous potential of strata, gamma-ray logging, contact logging, induction logging, neutron gamma-ray logging. At the step of selecting triangles and (or) at the step of selecting depths, the obtained results are displayed for visual perception and triangles are marked depending on the mismatch value.
EFFECT: high accuracy of identifying structure of reservoirs of geologic strata.
13 cl, 5 dwg
SUBSTANCE: test and production wells in the investigated section are located at points of the areas determined by means of a forecast obtained based on experienced neural networks as per seismic profiles and other geophysical data belonging to the above investigated section. Besides, training of that neural network is performed on the neighbouring deposit belonging to a common geological complex with already proven oil and gas occurence.
EFFECT: improving efficiency, economy and ecological compatibility of the working-out.
4 dwg, 1 tbl
SUBSTANCE: areas with black and white smokers are detected at the bottom of a water area. Buoy stations are arranged at several horizons, which are equipped with a metering complex. Methane concentration is measured in water thickness, coordinates of gas formation are detected. Besides, samples are taken from rocks and vegetation along waterways. Samples are analysed for content of chemical elements, and oil and gas promising areas are found.
EFFECT: expansion of functional capabilities.
SUBSTANCE: underwater observatory is linked to a ship system and includes a "Data" buoy type device. The "Data" buoy type device consists of a spherical, transparent sealed housing made from titanium and mounted on a bearing frame. The bearing frame and the housing of the "Data" buoy type device are fitted with means of recording geophysical and hydrophysical data: a seismometer, a hydrophysical module, a magnetic field sensor, a methane sensor, a pressure sensor, a spatial orientation sensor, as well as nuclear magnetic resonance sensors.
EFFECT: broader functional capabilities and high reliability during operation.
2 cl, 10 dwg
FIELD: oil and gas industry.
SUBSTANCE: method involves initiation of in-situ combustion at least in one injection well, pumping and measurement of air flow rate and advancing of combustion front from the well inside the formation under action of pumped air; arrangement of a number of sensors on the surface or at small depth under the ground around injection well; recording of sensors readings. In order to study the spatial position of combustion front, field temperature surveys are performed by means of temperature sensors, and geochemical surveys are performed by means of sorbent sensors and by extracting the soil samples. Location grid of sorbent sensors and soil sampling points coincides with location grid of temperature sensors. Arrangement of sorbent sensors and extraction of soil samples is performed to determine concentrations of hydrocarbon (C1-C6) and non-hydrocarbon (H2, N2, CO, CO2, O2) gases. As per the results of field surveys there built are maps of distribution of temperatures and distribution of concentrations of hydrocarbon and non-hydrocarbon gases; they are interpreted and spatial position of combustion front is determined as per the received materials.
EFFECT: improving accuracy and reducing the time spent on determination of location of in-situ combustion front in oil deposits.
5 cl, 2 dwg
SUBSTANCE: geophysical field parameters are continuously measured in the monitored area. Measured parameter variations are detected by detecting sinusoidal oscillations of increasing frequency, having amplitude significantly different from the background for the monitored area. Detection of said sinusoidal oscillations determines possible onset of a catastrophic phenomenon. Rayleigh and Stoneley surface waves are detected on land in the coastal area. The onset of a catastrophic phenomenon is determined from the acceleration power spectra for the vertical component of the microseism, picked up from the Rayleigh and Stoneley waves, specifically: periods of calm state and periods of a microseismic storm are compared.
EFFECT: high reliability of detecting approaching catastrophic phenomenon.
SUBSTANCE: system for core drilling of an underground bed that surrounds a well shaft comprises: a body of a tool designed for installation in the well shaft near the shaft tunnelling bed for core extraction, a motor, a rotation drive head connected with a motor, a rotary tool. The rotary tool is connected with the rotation drive head with one end and carries a drilling bit on the other end. The drive mechanism comprising an anchor joint for fixation in the well shaft and an axial drive for displacement of the tool body and the rotary tool. The tool comprises a guide for pushing the rotary tool aside from the well shaft into the surrounding bed. At the same time the rotary tool is a tubular tool of core drilling, which carries a circular drilling bit. The hollow shaft stretching from the rotation drive head into the tool body. The motor is connected with the external surface of the hollow shaft for the rotation head drive. Also comprises a coupling of alignment linkage that surrounds the shaft.
EFFECT: increased operational reliability of a system.
FIELD: oil and gas industry.
SUBSTANCE: communication is established as to pressure between the instrument pressure sensor and the formation; the first pressure reduction is performed with the instrument; the data that specifies the pressure is measured with the pressure sensor; at least one reliability parameter is determined based on the pressure data, and at least one reliability parameter is displayed. At least one reliability parameter represents inclination of the pressure curve at the end of pressure increase cycle.
EFFECT: determination of reliability of measurements performed with the test instrument during the drilling process.
14 cl, 48 dwg
FIELD: oil and gas industry.
SUBSTANCE: method includes determination of permeability, porosity, viscosity of a displacement agent and a displaced fluid, efficient oil-saturated thickness of a bed opened by a well, initial bed pressure for all facilities of mining of a tectonic structure, saturation pressure. Field process information is collected on relative phase permeabilities of the displacement agent and the displaced fluid with account of field information on viscosities of filtration components, on relative phase permeabilities when gas is released from a fluid into a free phase. Values of balance and extracted reserves of oil and design bottomhole pressures at producing wells are determined by years of development. To determine dynamics of development parameters by years, a number of production and injection wells introduced year by year is forecast. Following the results of calculation by years, values of oil, fluid, gas production, water cut, current bed pressure, decommissioning of wells, current coefficient of oil extraction are determined. Additional the initial debit of the wells is determined by fluid using the given mathematical expression. Initial productivity of oil-producing wells is analysed depending on the type of carriers, their dynamics as thermodynamic conditions vary for deposits of analogues. The current productivity is determined, as well as the average injection capacity of injection wells depending on permeability of carriers, water injection. Water cut of well products is determined according to dependence on development of oil reserves, as well as current bed pressure using the given mathematical expression. The number of producing and injection wells is forecast after drilling on the basis of the given dependences.
EFFECT: improved method and increased accuracy of forecasting of development parameters for new facilities at initial stage of development.
2 cl, 2 dwg, 1 ex
FIELD: oil and gas industry.
SUBSTANCE: method and tool that implements the method involving the measurement of viscosities and flow rates of fluid media of the formation and obtainment of the ratio of relative permeabilities of formation fluid media and formation wetting ability using those viscosities and flow rates of the formation fluid media.
EFFECT: testing of bottom-hole formation for determination of relative permeability under bottom-hole conditions.
18 cl, 5 dwg
FIELD: oil and gas industry.
SUBSTANCE: invention relates to the method and system for obtaining characteristics of the composition gradients and fluid medium properties of the involved header, and analysis of the header properties based on such gradients.
EFFECT: improvement of the device.
20 cl, 3 dwg
FIELD: oil and gas industry.
SUBSTANCE: invention relates to a measuring device of water content and salt concentration in multiphase fluid flow in underwater oil production equipment, which includes the following: a capacitance sensor located inside tube section (5), through which multiphase fluid flow passes, signal generator (10) connected to the capacitance sensor; the first measuring transducer (40) having the possibility of measuring the voltage on the capacitance sensor; the second measuring transducer (50) having the possibility of measuring the current passing through the capacitance sensor; outlet circuit (60) having the possibility of generating output signals (70, 72) based on signals generated with first (40) and second (50) measuring transducers, which characterise salt concentration and water content in multiphase fluid flow, and control unit (80) having the possibility of receiving the first and the second output signals (70, 72), processing the values of received signals, providing communication to external communication bus (86) and controlling the parameters of signals of signal generator (10). Invention also relates to a measuring method of water content and salt concentration in multiphase fluid flow in underwater oil production equipment.
EFFECT: possibility of controlling parameters of signals at measurement of water content and salt concentration in multiphase fluid flow in underwater oil production equipment.
16 cl, 5 dwg
FIELD: oil and gas industry.
SUBSTANCE: presented method implements the principle of change of a specimen position relative to direction of centrifugal force at centrifugation of the specimen for the purpose of more complete removal of capillary retained water and more accurate determination of the fixed water volume. The change of the specimen position during centrifugation provides water drainage from dead-end pores and concave sections of pore channels. The change of specimen position relative to centrifugal force vector is achieved due to the fact that in addition to the specimen rotation in the centrifuge about the rotor, the specimen rotates about its own centre.
EFFECT: improving the accuracy of determination of the quantity of fixed water in rocks owing to more complete removal of capillary water from the specimen at centrifugation.
FIELD: oil and gas industry.
SUBSTANCE: method involves determination of integral hydrodynamic characteristics as per drill hole hydrodynamic research (DHR) results, measurement of flow rate and calculation of filtration properties of each formation, and then, depending on well operating conditions, the following actions are taken: according to Version 1, as per DHR curves in an open shaft there evaluated are ratios of porosities and effective thicknesses of formations; based on integral skin factor value determined as per DHR and value α, skin factors and permeability of each formation are calculated. According to Version 2, records of acoustic logging and thermometry are fixed in the well, as per which height and width of formation hydraulic fracturing (FHF) is evaluated and skin factors of each formation are calculated. According to Version 3, when performing DHR, time variation curves of flow rate of each formation and difference of flow rates are recorded; average rate of change of flow rate difference is determined, as per which skin factor and permeability of formations is evaluated.
EFFECT: improving evaluation reliability of individual filtration properties of each of the jointly operated oil formations considering mutual influence of formations on each other, as well as considering differences of skin factors of formations.
3 cl, 4 dwg
FIELD: oil and gas industry.
SUBSTANCE: method involves the following sequence of actions: after continuous well operation cycle during at least 30 days, a long-term (at least 3 days) level recovery curve is recorded, as per which current productivity of formations is evaluated; then, on the basis of comparison of current productivity with the initial one, it is determined, how much the skin factor has been changed. Besides, in order to obtain continuous time variation curves of pressure and skin factor, repeated interpretation of pressure and flow rate change curves is performed during the whole time period of observations since the well has been started up.
EFFECT: improving reliable determination of skin factor reduction points for opened hydraulic formation fracturing of low-permeable formation.
FIELD: oil and gas industry.
SUBSTANCE: method includes determination of conditions of rocks forming as per material composition and per textural and structural diagnostic indicators (lithologic and facies analysis), mineral-petrographic analysis of sedimentary rocks of investigated object, interpretation of well survey materials, data processing by methods of multidimensional mathematical statistics. At first facies are determined by a set of diagnostic indicators, then a complex of mineral-petrographic parameters is used for verification, then relation between quantitative and aggregate data which are qualitative characteristics of extracted rocks obtained due to lithologic and facies analysis, such as texture and grain composition coded and being a numerical form which are the basis for forming of three-dimensional model of deposit are analysed by methods of multidimensional statistics.
EFFECT: increasing the deposit development and operation efficiency.
FIELD: oil and gas industry.
SUBSTANCE: down-hole testing and measuring complex includes earth control station with telemetric data system connected by a logging cable with submerged-type electric pump at the end of tubing string, system of measuring modules including sensors for recording of parameters (yield, pressure, temperature, moisture content) and driving machine for their delivery to horizontal section of a well connected by a logging cable that provides rigid mounting for the system of measuring modules and transfer of data to the control station. Logging cables of the system of measuring modules telemetric system unit are connected by cable connectors. Driving machine contains two walking modules connected electrically and further driven by electrical micro-drives and sequential movement of wedged supports. Installation of the down-hole testing and measuring complex is performed in two stages. At first system of measuring modules is lowered to a well by means of winch with survey cable connected by a cable connector with a logging cable of the system of measuring modules passing through a groove in the wall of an installation pipe mounted at the well surface at the end of tubing string and by the other butt end - to the deadman in which tube there is a movable logging cable. The system of measuring modules is lowered at first up to driving machine turning to a relatively horizontal section, then by means of the driving machine it is hold to the relatively horizontal section until cable connector seats in the deadman tube; the latter is lowered by means of the installation pipe to the preset depth and fixed on the well bore. Thereafter power supply is switched odd in the micro-drive, by means of the winch socket with the survey cable is disconnected from connector pin and the installation pipe is lifted to the surface. At the second stage submerged-type electric pump is lowered to the well with logging cable and socket of cable connector contact pair filled by liquid sealant which is by means of a centring skid connected to the logging cable for the system of measuring modules.
EFFECT: increase of operational efficiency during installation of the bottom-hole complex.
6 cl, 5 dwg