Method of evaluating porosity and penetrability of oil and gas deposits
SUBSTANCE: method consists in boring vertical, horizontal or inclined borehole, in recovery of core samples from collector rock, in applying thermal analysis for identification of separate chemical compounds of collector, in determining connection of per cent concentrations of minerals with parametres of porosity and penetrability by using multi-dimensional correlation-regressive analysis and obtaining plural linear correlation equations for concrete oil and gas deposits facilitating calculation of porosity and penetrability on base of data on mineralogical composition of oil and gas deposits.
EFFECT: reduced labour intensiveness, and upgraded accuracy and validity of determination of mineralogical composition of core material.
1 ex, 2 tbl, 4 dwg
The invention relates to the oil and gas industry, in particular to the field of evaluation and prediction of the productivity of hydrocarbon deposits and fields, and can be used for multipurpose determine the reservoir properties (FES) reservoirs of hydrocarbons.
To assess the current state of development, the calculation of oil and gas, the volume and categories of industrial stocks, research hydrocarbonaceous deposits is carried out using geophysical, parametric studies of wells petrophysical, geochemical and other methods of research core (rock samples).
Known methods of determination of open porosity on the extracted core samples of regular geometric shape, raised from the borehole during drilling method of saturation of their nonpolar kerosene (see OST 39-161-83 Oil. Laboratory method for determining the absolute permeability oil and gas reservoirs and enclosing rocks"), and coefficient of permeability of the core samples of regular geometric shape, raised from the borehole during the drilling process by the method of stationary air filtration (OST 39-181-85 Oil. Laboratory method for determining the porosity hydrocarbon species").
The disadvantage of these methods is that they can be approx the tive only in the presence of conditioned core samples, require time and labor costs. The definition of these parameters using GIW (GIS) involves significant financial costs.
The aim of the invention is to reduce the complexity and cost of the method, improving the accuracy and reliability of the determination of the mineralogical composition of the core material deposits on the minimum and unconditioned specimens of the breed.
This objective is achieved in that in the method of determining the porosity and permeability of the reservoir oil and gas, including the drilling of vertical, horizontal or slanted wells, selected core samples from the rock collector, apply thermal analysis to identify individual chemical compounds, link percentage concentrations of minerals with parameters porosity and permeability due to the use of multivariate regression analysis, get multiple linear correlation equations for specific oil and gas fields, which allow to calculate porosity and permeability, using data on the mineralogical composition of the layer.
The method is as follows.
Are drilling vertical, horizontal or slanted wells (or one hole) with a selection of core samples from the od of the collector. In contrast to the known method, there is no need to strive to ensure continuous and full coring, since the implementation of the proposed method is receiving substandard core material.
The obtained core material is subjected to a complex thermal analysis, consisting of the following steps.
1. Preparation of rock samples
The most characteristic pieces of rock weighing 100-200 g crushed in a steel mortar, and then in a porcelain mortar communicated to the size of grain not exceeding 0,1-0,2 mm
The prepared sample with a volume of 2-3 cm3used for primary thermal analysis. If the data of thermal analysis established that the rock contains organic matter in the amount not exceeding 3%, and the content of the main predopredelyayutsya mineral is at least 95% and does not require clarification on the composition of impurities, then the operation completes.
If the content of the primary rock-forming mineral is not more than 90% and the organic matter content of more than 3%, or require a detailed study of impurities, then carry out the following operations: 1) to remove part of the organic matter extraction alcohol-benzol mixture in to conventional Soxhlet extractions; 2) washing salts from the samples of hot distilled water; 3) to remove carbonates and pyrite dissolution in 10%-nasolenou acid followed by rinsing with distilled water; 4) allocation otmuchivaniem of the terrigenous part of the breed of clay fraction. Selected clay fraction is then investigated thermographically.
2. Conducting thermal studies
The primary mode of research.
1. Corundum crucibles or platinum with a capacity of 1.5-2.5 cm3. Rarely used quartz crucibles with a capacity of 1.5 to 0.5 cm3or small platinum crucibles with a capacity
0.5 to 0.2 cm3.
2. Weighed samples of 1.5 to 3.0,
3. Heating rate: master mode 5°C/min were the least used mode of 2.5; 10; 0.5°C/min
4. The final temperature of 1000°C.
5. Sensitivity differential thermal analysis (DTA) - 1/5; rarely used - 1/10, 1/20, 1/2, 1/1.
6. Sensitivity differenziale-thermogravimetric (DTG) - 1/5; rarely used - 1/2, 1/10, 1/20.
7. Scale thermogravimetric (TG) for preliminary studies variable depending on the type of breed
a) up to 200°C - 20, or 50, or 100 mg
b) from 200-600°C - 100, or 200, or 500 mg
in) from 600-1000°C - 100, or 200, or 500, or 1000, or 2000 mg
Sometimes to clarify the quantitative definitions kaolinitic clays additional studies where the test sample is added to the sample reference kaolinite up to 30%.
In some cases, to clarify the availability and quantity of α-quartz conduct research in cooling mode with the same rate of 5°C/m is N.
3. Chemical analysis of residues breed after thermal studies
If not carried out sectionentry chemical analysis of the core, and the breed is a noticeable amount of thermographically undetectable up to 1000°C anhydrite, then spend the following. Part of the remains of the breed diluted 10-fold washing with hot distilled water. The filtrate is collected and determine the number of SO4-2reaction with baryta water. Sometimes when the analysis of the terrigenous rocks of the need to establish the presence of minerals in the form of iron oxides (limonite, magnetite, etc.). For the remaining boiled in Aqua Regia, the filtrate is separated and carry out chemical analysis method for the presence of oxides of Fe2+and Fe3+.
4. Processing of research results
Processing derivatograph start with a calculation of the total mass loss. A portion of the sample before and after the study weighed on an analytical balance.
Curves TG, DTA, DTG is divided into zones at intervals of temperatures, with the fixing temperatures of the beginning and end of thermal effects, loss of weight or without. Note the temperature peaks thermal effects, DTG peaks, weight loss. Celebrate weight loss in these temperature ranges. In the simplest cases, for example, a fairly pure limestone, it is enough to split into two zones from 20 to 200°C (evaporation of N2O) and from 700 to 1000°C (dis who ociate caso 3) by the reaction of caso3⇔CaO+CO2and calculate % limestone.
If the rock contains a mixture of carbonate minerals, such as magnesite, dolomite, calcite, siderite, ankerite etc., the composition determined using the formula for the calculation of thermal effects the dissociation of Mg2+and CA+2comprising carbonates, and using data loss weight, tabular data ratio calculation.
For terrigenous rocks containing clay minerals, and impurities - anhydrite, carbonates (dolomite, magnesite, calcite, etc), siderite, use the information in a series of studies as with the whole sample, and with a fragment of rock. In some complex cases, when in the initial studies with whole sample was imposing thermal effects of different minerals accompanied by loss of weight, used DTG curve, Ostrava the descending branch is a separate component. Then determine the square DTG individual components and the total area of the corresponding DTG total mass loss. Accounting for the proportion of SDTG- XΔmiSΣDTG- XΔmand making calculations, determine the mass loss of each component. Then, using a table of estimated coefficients, calculate the percent of a component in the specimen of the breed.
The degree of approximation which can be explored all lithological with the STS collector throughout the volume of the reservoir, ultimately determines the accuracy of forecasting productivity and reservoir recovery. It can be increased either by increasing the number of samples, or the study of samples of large size, or the use of methods of mathematical modeling of the variability of reservoir properties. A large amount of factual material was determined using probabilistic and statistical methods of studying and generalization of material on reservoir properties of rocks, which allowed us to obtain a more objective and reliable assessment results on a quantitative level.
Next, apply one of the methods of mathematical statistics - correlation and regression analysis. The regression is called the dependence of the conditional mathematical random variable Y from the values of X. This dependence is expressed by the corresponding equation. Finding the type and coefficients of this equation represents the task of correlation and regression analysis. View the regression equation is usually chosen based on the physical meaning of the tasks, and the coefficients are determined most often by the method of least squares. This is due to the assumption of normal distributions of Y values (the array of the actual values of porosity/permeability) and X (a multidimensional array of the percentage of the main cell battery (included) is tov in the composition of the core), which is in good agreement with practice. The essence of this method consists in the following: the sum of the squared deviations of calculated values of porosity/permeability from the actual data should be minimal, i.e. to ensure the minimum of the expression:
where Yi- the i-th value of the random variable Y;
Xi- the i-th value of a multidimensional random variable X;
i - number of the measured sample;
k is the number of measured samples;
f - linear scalar function of many variables (component X), describing the regression curve.
Assuming that there are k samples with known mineralogical composition consisting of n component with core study of porosity and/or permeability, we obtain that k has measurements of porosity and/or permeability, i.e. the value of Y1, Y2, ..., Ykand as k sets of multicomponent variable X: X1, X2, ..., Xkwhere.
Due to the fact that the breed of collector consists of many minerals, arose the necessity to solve the problem of multiple correlation. The result of these studies was obtained linear correlation equation of the form:
where n is the number of the component of the mineralogical composition of the A.
The coefficients And1And2, ..., Anfound by using the least squares method as the solution of a system of linear equations:
The solution of this system can be performed using numerical methods, and using build identifier Kramer, method, Gauss or other available methods.
Next set of experimental correlation between the percentage of rock-forming minerals with reservoir reservoir properties.
To use the obtained regression curves it is necessary to determine the confidence interval for the values of the content of each component in the composition of the analyte. In our case, the confidence interval was constructed for the mean relative prediction error, defined as the ratio of the difference between predicted and measured values to the predicted value of the investigated trait. The measured value in this case is as true, as it is much nearer to him than predicted. Often when conducting regression analysis introduces the possibility of spurious correlation. This phenomenon takes place in the analysis of so-called prepreg) is closed by a numeric systems belong to all systems in which the sum of all signs shall be equal to one hundred percent. The presence of false correlation leads to significant errors. The proposed method was able to reduce this error to a minimum due to the large number of analyzed traits.
To calculate the bounds of applicability of the proposed method calculates the n-dimensional rectangle in n-dimensional space (on the axes of this space is deferred percentage or other mineral) with center in the point with coordinates equal to the mathematical expectation of the percentage of minerals, and with semi-axes equal to the square root of the variance of the considered variables with appropriate allowances for the physical meaning of quantities. This method allows not only to determine the boundary values of the applicability of the regression analysis, but also to identify the measurements of the mineralogical composition of the core, significantly different from the rest of the "cloud" measurements.
Figure 1 shows the joint presentation of the measured and predicted permeability values for Novo-Klyuchevskaya field; figure 2 is a joint presentation of the measured and predicted values of porosity for Novo-Klyuchevskaya field; figure 3 - distribution measurements of the percentage of the field current is the same in the studied core Novo-Klyuchevskaya field and displaying the boundaries of the applicability of the proposed method for the analysis of the content of feldspar; figure 4 - distribution of permeability in the hydrodynamic model of the object CI+CIa Novo-Klyuchevskaya field.
An example implementation of the proposed method.
Obtained during the drilling of borehole core material Novo-Klyuchevskaya field Samara region subjected to thermal analysis. The results of the research determined the percentage of individual chemical compounds that make up the breed (see Table 1).
After receiving percentage composition, conduct correlation and regression analysis, in result we have the following dependencies for porosity and permeability:
where M is the calculated porosity, % (see Table 1, column "Porosity calculation");
It is estimated permeability, MD (see Table 1, column "Permeability calculation");
x1- dolomite, x2calcite, x3- hydromica, x4- chlorite, x5- kaolinite, x6quartz, x7- dust particles of feldspar, x8- organic matter - sediment composition in % weight.
Figure 1 and 2 shows a joint presentation of the measured and predicted values of porosity and pronice the spine for Novo-Klyuchevskaya field.
Finding the boundaries of applicability for this study can be presented in table format (see Table 2). In the table calculated boundary values for each of the substances using the values of mathematical expectation and variance, in bold in the table indicates the values that are obtained for the limits. Found the boundary values apply only for the prediction of porosity and/or permeability of core samples, but not to adjust the previously obtained correlation equations.
The obtained limits of applicability is demonstrated by the percentage of feldspar in composition of the samples in figure 3. Icons figure 3 shows measurements of the percentage of feldspar in the studied core samples Novo-Klyuchevskaya field, the squares marked values not included in the interval, applicable for the prediction of porosity or permeability on the mineralogical composition of the core, circles - applicable for calculation of the forecast point. The black solid line shows the expectation parameter, dot-dash and two dots-dash - respectively the upper and lower limit value to the applicability of the parameter.
The application of the method to create and Refine the geological model is to adjust or direct use value the deposits of porosity and permeability in wells, allows you to more accurately describe the picture of the development of reserves in the reservoir or to explain anomalies reserves in the case when the data of porosity and/or permeability in geophysical research wells or reservoir core studies are missing. Clarification of the distribution of porosity reservoir model allows us to estimate the distribution of reserves and, consequently, the direction of their generation. Clarification of permeability distribution in the hydrodynamic model can more accurately determine the nature of promotion of formation and injection waters, the direction reserves, the nature of the irrigation wells.
Using calculated on the basis of correlation and regression analysis of the values of porosity and permeability has been updated geological model of the object CI+CIa Novo-Klyuchevskaya field, allowing to simulate the nature of the oil displacement Samanthurai and injected water and to identify the zone of localization of residual oil reserves (figure 4). Thus, the available information about the exact mineralogical composition of the collector allows to determine the values of porosity and permeability of rocks for individual objects based on the methods of mathematical statistics. In General reduces the complexity and cost of the method through the use of the minimum and not Edizioni rock samples, increases the accuracy and reliability of the determination of the mineralogical composition, including the early and late stages of field development. The proposed method solves the problem of mandatory application of field data (study of core material) in the development of hydrocarbon deposits, as well as obtain the necessary information about the FES collectors to create and Refine geological models, which allows the development of oil and gas fields to significantly increase oil recovery.
The method of determining the porosity and permeability of the reservoir oil and gas, including the drilling of vertical, horizontal or slanted wells, selection of core samples of reservoir rocks, characterized in that the applied thermal analysis to identify individual chemical compounds, communicate percentage concentrations of minerals with parameters porosity and permeability due to the use of multivariate regression analysis, get multiple linear correlation equations for specific oil and gas fields, which allow to calculate porosity and permeability, using data on the mineralogical composition of the aquifer.
FIELD: physics; measurement.
SUBSTANCE: invention may be used in many production industries, in laboratory practice of mining, geological, oil and gas research institutes and enterprises in performance of physical and chemical analyses. Device contains frame formed with top and bottom cross beams and two stands. Core holder is installed inside the frame, and it incorporates hollow casing with radial channel, top and bottom covers, upper and lower puncheons, including axial and radial channel, cartridge with rock sample installed inside of it. Device contains cylindrical support with through aperture, upper edge of which is connected to the lower cross beam of frame, and lower edge - to bottom that includes prop fixed in its axial opening and hingedly connected to the bottom edge of lower puncheon. Pneumatic chamber that incorporates casing with radial channel and piston is installed inside the frame. Casing of pneumatic chamber is rigidly fixed to spring-loaded fork supports with the possibility of their hinge sliding to sealed connection with upper edge of core holder top cover, through channel is arranged inside top cover. Pneumatic motor is connected to radial channel of casing, balloon with gaseous helium or nitrogen is connected to radial channel of top cover and radial channel of lower puncheon. Trap is connected to valve of top cover body radial channel, and piezometer is connected through appropriate valves.
EFFECT: simplification of design, higher reliability of its operation and reduction of cost at required efficiency.
3 cl, 6 dwg
FIELD: oil and gas industry.
SUBSTANCE: invention refers to oil and gas industry and is designed for study of rock samples, selected from a porous medium crushed in a natural or artificial way. Porosity of studied rock fragments is measured by means of testing pressure of helium or any other gas in accordance with a known procedure. The chamber of fragments, containing the above said rock fragments, is connected to a reservoir of a known volume containing helium under a known pressure. At a balance of pressures the value of a hard volume can be calculated. Also mass of these fragments and circumflex volume of the studied rock fragments is measured. Combining in a certain way these measurements porosity as well as density of the studied rock samples is determined. Then their permeability is evaluated by means of drowning these fragments into liquid and connecting chamber with liquid initially contained in a special reservoir under a certain pressure to compress gas which is contained in pores of studied rock. By means of modeling of variations of volume of liquid supplied into the chamber and by means of the iterative correction the values of the said physic parameters are evaluated.
EFFECT: upgraded accuracy and simplicity of rock permeability and porosity evaluation.
14 cl, 13 dwg
FIELD: oil and gas industry.
SUBSTANCE: invention refers to oil and gas industry and can be used at evaluation of the type of a solution not upsetting the filtrating properties of rock. The essence of the method of evaluation of influence of process liquid filtrates penetration on filtering characteristics of rock is based on determining a water and residual water volume in a sample. If contents of water in the sample is lower than that of residual water, then it is considered that adsorption of chemical reagents on the surface of rock causes reduction of permeability; if then contents of water in the sample is higher than residual water then diffused layers cause reduction of permeability.
EFFECT: maintaining filtration characteristics of a well bottomhole.
FIELD: chemistry; organic.
SUBSTANCE: invention relates to the methods of determination of microorganism permeability index and can be used to control the effectiveness of high-efficiency particulate air filter and personal protective gear in biotechnology, sanitary, medical and applied microbiology while working with microorganisms and its toxins. The method for determination of aerosol filter permeability for microorganisms includes preparation of liquid test specimen, its dispersion in aerosol before filter, selection of aerosol samples before and after filter, determination of the biological marker content in aerosol samples. The test specimen of protein initiating ice formation, ice formation activity detection, which is carried out according to occurrence of samples of nucleation centers is used as a marker.
EFFECT: insurance of the safe method for determination of microorganism permeability index.
FIELD: investigating or analyzing of materials.
SUBSTANCE: method comprises plotting calibrating curve of porosity as a function of the absorption coefficient for reference monolithic specimens with the same chemical nature as the specimen to be analyzed, choosing the intensive absorption band, and determining porosity of the analyzed specimen with regard to its absorption coefficient.
EFFECT: simplified method.
FIELD: investigating or analyzing materials.
SUBSTANCE: chamber comprises tightly interconnected base, central part, and lid. The inner spaces of the base and the central section are separated by means of a water-saturated semi-permeable diaphragm that is made of diaphragm ultra-filter mounted on the perforated substrate. The diameter of the holes in the substrate exceeds the diameter of the pores in the diaphragm ultra-filter by a factor of (3-5)·103. The central section or the lid is provided with the connecting pipe and valve, and the base has a collector for liquid.
EFFECT: expanded functional capabilities.
1 cl, 1 dwg
FIELD: testing engineering.
SUBSTANCE: device comprises unit for securing the specimen, means for supplying water to the specimen, means for detecting leakage, means for generating air flow blowing around the specimen, and means for measuring temperature. The unit for fastening the specimen is made of a metallic detachable structure. The opening in the bottom ring receives the gage for measuring the surface resistance which is connected with ohmmeter. The means for supplying water is made of a unit composed of tank and member for temperature control and is mounted for permitting change of its level inside the tank. The means for generating air flow is made of fan for made for permitting control of its position in height, inclination angle, and temperature of air flow. The method comprises conditioning the specimen at a constant temperature and humidity, applying water on the specimen, and producing temperature difference in the bulk of the specimen. The air flow is simultaneously directed to the specimen. During testing, the temperature of the outer and inner surfaces of the specimen is recorded simultaneously with the recording of the surface and bulk resistance of the specimen. The time period that the specimen takes to be wetted is judged by the records obtained by the potentiometer and ohmmeter.
EFFECT: enhanced precision.
4 cl, 7 dwg, 2 tbl, 2 ex
FIELD: measuring technique.
SUBSTANCE: method comprises connecting the chamber with the material to be tested, evacuating the measuring chamber, expanding the measuring chamber to reach a pressure providing molecular flow regime through the pores of the material to be tested, measuring the volume of the measuring chamber, and recording the moment at which the gas begins to flow through the material, residual pressure of gas, and temperature in the chamber in this period. The coefficients of filtering, permeability, diffusivity, solubility and porosity are determined using these data from the formulae proposed.
EFFECT: enhanced precision.
FIELD: methods for detecting irregularities of electro-physical and geometric parameters of dielectric and magneto-dielectric covers on metal surface, possible use during control of composition and properties of solid covers in chemistry, paintwork and other industrial branches.
SUBSTANCE: UHF introscopy method includes creating an electromagnetic field of slow surface wave above a dielectric cover on electro-conductive substrate and following recording of electric field strength changes. Expectation mα and dispersion Dα are computed for normal fading coefficient of electric field of slow surface wave in each point of measurements of the surface being scanned using provided mathematical formulas. Using a matrix of dispersion values of field fading coefficient, across the whole scanning surface a spatial distribution of normal fading coefficient of slow surface wave field is built, for which wave the spatial pattern visually shows shape and geometric dimensions of irregularities.
EFFECT: increased precision when determining irregularities of covers and when evaluating their geometric and electro-physical parameters.
FIELD: measuring technique.
SUBSTANCE: method comprises producing reference specimens with a standard diameter of the pores and having the same chemical nature as the specimen to be analyzed, recording IR-spectra of transmission of the reference specimens, determining the value of the wavenumber for which the IR-radiation transmission is 50% (point of inflection), and obtaining reference histograms. The sizes of pores are judged by the position of the points of inflection in the transmission spectra.
EFFECT: enhanced precision.
FIELD: oil and gas industry.
SUBSTANCE: invention relates to evaluation procedure of oil and gas subterranean structure field. Test of rupture by discharge/release consists of charging of fluid, gas or its combination, containing desirable additions for compatibility with structure, at discharge pressure, exceeding structure rupture pressure, with following stopping period. Pressure decay during the stopping period is measured and analysed for the detection of penetrability and resistance of rupture face by means of preparation of specialised Cartesian diagram on the assumption of stopping data by means of application of corrected pseudovariable, such as data of corrected pseudopressure and data of corrected pseudotime. This analysis provides for data on diagram to be places lengthwise straight line along with constants or depending of pressure properties of fluid. Incline and intersection of straight line are correspondingly indicators of penetrability calculation and rupture face resistance R0.
EFFECT: reduction of harmful effects influence of depending from the pressure fluids properties at penetrability calculation and rupture face resistance of tank.
86 cl, 9 dwg
FIELD: oil and gas industry.
SUBSTANCE: invention relates to oil-producing industry and provided for receiving the information about geological formation, about casing pipe or about fluid in casing pipe. For this there are used requester and one or more sensing device in borehole. Requester is located in borehole, and it is usually implemented with ability of movement inside the borehole. Sensing device, which is fix installed in cut in casing pipe hole, allows body and vessel with corresponding electronics. Body of the sensing device is usually implemented with the ability of provision of hydraulic gate relative to hole in casing pipe. Requester and sensing device implement communication to each other by wireless method.
EFFECT: providing of on-line monitoring of cased boreholes parametres with simultaneous simplification of measurements.
36 cl, 9 dwg
FIELD: physics, measurements.
SUBSTANCE: proposed set of inventions relates to oil product, particularly, to getting and analysing the samples of in-place fluid medium. The proposed method comprises the steps that follow. First, optical density data on fluid medium sample is obtained for, at least, one-colour channel, water channel or a set of optical channels by measuring wavelength optical density with the help of fluid medium analyszer, and, at least, in one channel of fluid medium component to determined the fluid medium composition or properties with the help of fluid medium downhole sampler furnished with optical pickup. The colour absorption function is defined based on optical data for fluid medium sample in, at least, one colour channel. The part of optical density subject to color absorption, absorption in water in, at least, one aforesaid channel of fluid medium component. The electronic system designed to refine the data on the fluid medium sample incorporates an input device, memory coupled with input device and memory.
EFFECT: accurate data on fluid medium sample resulted from elimination of colour, water and scattering effects.
25 cl, 13 dwg
FIELD: oil-and-gas industry.
SUBSTANCE: invention relates to device and method allowing the bench estimation in drilling. The proposed device arranged in wellbore, nearby the subsurface bench, comprises the casing, casing fluid inlet, fluid pump communicating with the said casing fluid inlet and incorporating the first piston fitted in the pumping chamber to suck in and discharge fluid when acted upon by tubing pressure.
EFFECT: device and method higher reliability and efficiency, space saving in river drill pipes.
18 cl, 10 dwg
FIELD: oil-and-gas industry.
SUBSTANCE: invention relates to oil-and-gas industry and can be used in analysing fluid dynamics of gas medium at hydrocarbons deposits and subterranean gas storages. The proposed method comprises forcing gas medium indicator marks representing gas-filled micro granules with the dispersion degree of 0.5 to 0.6 µ into the bench through different injection holes and sampling from output holes. Note that indicator mark sampling is realised by forcing gas through sampling tube along with controlling gas passing time and the hole rate of yield, the sampling tube gas flow rate is determined from mathematical expression. The content of micro particles in indicator mark is determined from mathematical expression. The invention covers also the device to embody the above-described method.
EFFECT: continuous sampling, higher sampling efficiency and validity of results.
3 cl, 1 ex, 2 dwg
FIELD: oil and gas industry.
SUBSTANCE: invention refers to well boring, and can be used for preventing and eliminating troubles and accidents during boring process performed in the areas adjacent to or located just above the buried continental rift. Method involves rock sampling during boring process, and analysis of samples. At that terrigenous rocks are sampled from oil-and-gas bearing deposits of sedimentary cover, which are adjacent to or located just above the buried continental rift; rock samples are treated with 1:1 salt acid solution; laumontite zones are revealed in terrigenous masses of the cover by occurrence of silica jelly-like mass, which can mean that there are deep hidden breaks, and the appropriate activities preventing emergency situations are carried out.
EFFECT: simplifying the prediction method at maintaining accuracy of results and reducing costs required for method realisation.
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.
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
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 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