SU1461891A1 - Method of determining depletion parameters of oil formation - Google Patents

Abstract

This invention relates to field geophysics. The purpose of the invention is to improve the accuracy of determining the parameters of the production of oil reservoirs with the salinity of formation waters varying with time. For this, prior to geophysical surveys, the well is filled with a fluid with sharp contrasting physicochemical properties with respect to the formation water. At the end of the well, the pipe and hole spaces are isolated above the roof of the reservoir, and geophysical investigations are carried out in the pipe space after mixing the fluid with contrasting properties in the annulus below the roof of the reservoir with formation fluid. In the process of geophysical research, the lifetime of thermal neutrons, the salinity of the reservoir water, the ratio of oil and water, the electrical resistivity, the dielectric constant, and the temperature of the reservoir are determined. Based on these values, the residual oil saturation of the formation and the relative phase permeabilities for oil and water are calculated. (L

Description

one

The invention relates to field geophysics, in particular to the use of field geophysics methods to monitor the development of oil fields.

The purpose of the invention is to improve the accuracy of determining the parameters of the production of oil reservoirs with the salinity of formation waters varying with time.

The proposed method includes the following sequence of technological operations. In the observation well, which is surrounded by a metal or glass-plastic non-conductive column, the reservoir is opened by perforation / the production parameters of which are to be determined. Then the well tubing string is lowered into the well.

using a packer and a check valve that allows pumping fluid through the pump-compressor pipes into the annular space and the reservoir, but does not allow the liquid to flow back into the pump-compressor pipes. Pump-spring pipes can be steel along the entire length, or a part of them below the pack before the bottom can be made of GRP pipes. The packer is installed above the roof of the seam. Before the packer is closed, the well and tubing pipes are filled with fresh water or anhydrous oil, the physicochemical properties of which (density, salinity, electrical conductivity) differ sharply from the properties of the formation water. After the packer is closed, the reservoir is isolated from

ABOUT

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a column of borehole fluid in the annulus above the roof of the reservoir. When filtering fluids in the reservoir, they flow into the annulus of the well below the packer. After a certain time, the annulus, the space of the well due to the gravitational redistribution of liquids, is filled above the water-oil contact with anhydrous oil, in the interval from the water-oil contact to the bottom, the formation water resistance of the water in the annular space. Based on known dependencies, the salinity of the water content and the average lifetime of the thermal neutrons of the formation water of hV are calculated. Based on the measurement of the electrical resistivity of the formation rp according to one of the types of electromagnetic logging, the coefficient of porosity of the formations Kp according to the core or geophysical methods, the ratio of oil-bearing reservoir — formation water. The reservoir density of the reservoir K is calculated after establishing such an equilibrium according to the Archie-Dakhnov formula, which is the ratio of oil to water and

Noah emulsion in the annulus of the well corresponds to the ratio of moving components of oil and water in the plate.

After mixing the fluid with contrasting properties in the annulus below the roof of the formation, the formation fluid conducts pulsed neutron logging

more common types of sand formations have the form

1 / pb 0.6

to Ky

; i;

less than two values of Kn, and then make up a control system of the form

To determine the relative phase permeabilities for oil, K (Kn) and water G8 (K) measure the volume fraction of oil

and additional geophysical research, 20 F, in the annular space with no

nor in the tube space.

Determine the salinity of the reservoir water

oil to water ratio

space by dimension or density

liquids (gamma-gamma logging), or elect

the conductivity of the fluid with the aid of an inductive resistivity meter in the presence of

fiberglass trailer tubing. Ratio measurement

oil and water in water-oil emulsion

Kn) -

one

(k: n)

M. bb (Kn)

(2)

and solve it with respect to Гв (Кн) and fH (KH). The viscosity of oil is c, and is well known for each field. The viscosity of water XB in- can also be carried out by the method of salinity and temperature-dependent oxygen activity. To determine the Tv of the water and it is determined on the basis of the division of the oil saturation of the reservoir in the presence of metal casing and tubing, only the average lifetime of the thermal

Claims (1)

Invention Formula measurements of Sv and Tv fluid in the annular space.  The advantage of the proposed method is to increase the accuracy of the determined neutrons using the pulsed neutron method of 35 dividing formation parameters, which is the logging method. In the presence of a double increase in its oil recovery, a fiberglass column to determine the current oil saturation, a complex of geophysical methods is used, including INA, induction, dielectric method, as well as other types of oil formation, including electromagnetic logging The use of pulsed neutron mining of a complex of INK and electrical rotaging of geophysical surveys in inter-logging improves the accuracy of measuring the reservoir shaft with determining the parameters of reservoir production. The application of the thermal neutron lifetime and the calculation of fiberglass casing columns and, according to their data, residual oil-saturated pine compressor tubes is preferred. Measurement of the required parameters of the formation fluids in the annular space and the formation is carried out by lowering the instruments into the pump-compressor. pipes. The proposed method can be pea-50 with liquid with sharply contrasting filaments not only in observational squash chemical properties with respect to the gin, but also in any production well after the introduction of the proposed elements into the well design. The calculation of the parameters of reservoir production is made by. .... „.„ the following algorithms. Physical studies are carried out in pipelines. According to gamma-gamma logging space or nominal space after replacing the liquid-induction resistivity meter, the density YB or the specific electrical conductivity of the formation is measured, in order before geophysical surveys, the well is filled to the reservoir water and is isolated at the end of the pipe and annulus of the well above the roof of the reservoir, pulsed neutron logging and additional Geotees with contrasting properties in the annulus below the roof of the reservoir, the resistance of formation water in the annular space. Based on known dependencies, the salinity of the water content and the average lifetime of the thermal neutrons of the formation water of hV are calculated. Based on the measurement of the electrical resistivity of the seam pp according to one of the types of electromagnetic logging, the porosity coefficient of the seam Kp according to the core or geophysical methods the density of the reservoir K is calculated according to the Archi-Dakhnov formula, which for more common types of sand formations have the form 1 / pb 0.6 to Ky ; i; less than two values of Kn, and then make up a control system of the form F, in the annular space with no one (k: n) M. bb (Kn) (2) Invention Formula the substance of the reservoir proposed to increase precisely, in order to increase its oil output  oil reservoir, which includes conducting pulsed neutron logging with geophysical surveys in the interval of the reservoir with determining the lifetime of thermal neutrons and calculating the residual oil  They are liquid with sharply contrasting physicochemical properties with respect to. .... „.„ the formation, characterized in that, in order to improve the accuracy of determining parameters with time-varying salinity of formation waters, prior to geophysical surveys, the well is filled with a fluid with sharply contrasting physical and chemical properties in relation to. .... „.„  Physical studies are carried out in a reservoir of water and isolate at the end of the pipe and annular space of the well above the top of the reservoir, pulsed neutron logging and additional geological space after fluid replacement. these with contrasting properties in the annulus below the top of the plas about in the process of research, the temperature of the reservoir Simultaneously, the salinity of the reservoir is measured by measuring the additional measurements, the ratio of oil and water, the specificity – the relative phase permeable electrical resistance, dielectrics for oil and water are measured.