SU1596101A1 - Device for hydrodynamic testing of formations - Google Patents

Abstract

The invention relates to geophysical research. The goal is to improve the accuracy of research. For this purpose, an additional outlet valve 7 is installed on the rod 4, the channel outlet port is installed between the main inlet valve 6 and valve 7. The device has a fluid flow sensor made in the form of a capacitive discrete level gauge 9 installed inside the probe receiver 8. Using this device allows determining parameters of formation fluids, composition, volumetric content, flow rate of liquid and gaseous components directly in the research process in borehole conditions. This device makes it possible to determine the phase permeability and significantly increases the reliability and reliability of the release of oil and gas saturated reservoirs. 5 il.

Description

The invention relates to well logging, in particular to hydrodynamic surveys and formation testing using cable instruments.

The purpose of the invention is to improve the accuracy of reservoir studies.

FIG. a, b, c shows a device for hydrodynamic research of layers, a general view; in fig. 2 is a diagram recorded by a capacitive discrete level gauge during a formation examination; in fig. 3 - diagrams recorded by a capacitive discrete level gauge when calibrating it with water and oil; in fig. 4 - the same diagrams in combination with diagrams of pressure change in the study of water saturated (a, b), oil saturated (c, d) and gas saturated (e, f) formations; in fig. 5 - diagrams of approbation of a capacitive discrete level gauge in downhole conditions.

The device (Fig. 1a) includes a housing 1, sealing bashmak 2, a clamping system 3, a movable rod 4 with an input 5, an output 6 and supplement. on weekends. 7 valves, probe 8, in which a fluid flow sensor is placed in the form of a capacitive discrete level gauge 9 and pressure sensor 10, channel I with inlet and outlet nozzles to move the fluid and equalize the pressures in the receiver 8 and the sampler 3, calibrated clearance 13 to move liquid phase samples. The outlet of the channel is installed between the outlet valves.

The device works as follows

After reaching the test interval, the device (see Fig. 5, a) is pressed by the sealing shoe 2 and the presser system 3 against the borehole wall, while the stem 4 with valves 5-7 moves upward, the inlet valve 5 communicates via the channel 11 the shoe outlet hole with a cavity sampler 8 (Fig. 56). The flow of fluid into the sample receiver 8 is monitored by a capacitive discrete level gauge 9 and a pressure sensor 10. After the reservoir pressure has been restored, the rod 4 is lowered, the channel 11 is uncoupled with the drain hole of the base 2 and the sample receiver 8 via the outlet valve 7 and channel 11 communicates with the sample box 12 (Fig. 5c), while the gas moves to the sample box and equalizes the pressure in the sample receiver and the sample box. Gas movement and pressure equalization is monitored by pressure sensor 10. Upon further lowering of the stem 4, the outlet valve 6 opens and the liquid portion of the sample through the calibrated gap 13 moves from the sampler to the sampler and the device returns to its original position.

In the diagram (Fig. 1), section a corresponds to the standard signal, sections b, c, d.

e I - filling of the sample receiver, part g - transition from sampling mode to transferring liquid to the sampler, parts / g, i, 7, k, I - moving liquid from the sampler to the sampler. Areas c, e, i, k with a constant voltage value correspond to the insensitive elements of the level gauge; areas b, d, f, h, I, I show the change in voltage during the selection and movement of the liquid to the sampler fixed by the sensitive elements, and the magnitude the corresponding stresses t / i, Ui-t / i, t / a-1/2 characterize the composition of the liquid. The magnitudes of the time intervals, 2-i,,, 5 5- / 4, correspond to the filling time of alternating sensitive and insensitive elements of the level gauge and characterize the flow rate of the fluids. The time intervals, ts-tj, tg-tB, correspond to the time of liquid transfer from the sample receiver to the sampler at intervals of the same elements of the level gauge and characterize the viscosity of the liquid phases of the fluid.

The saturation and volumetric content of 5 formation fluids are determined as follows. If the voltage ljz-U-2 and. Approaches the maximum value determined when calibrating the sensor for water (Fig. 2), the water column is saturated (Fig. 3a). The volume of water is determined by the number of filled levels. If the voltage U |, L / 2-t / i, (U. and approaches the minimum value determined when calibrating the sensor on oil (Fig. 2), the oil-saturated layer (Fig. 36). The filtrate volume, the mixture and oil is determined according to the number of levels when the liquid is transferred from the sampler to the sampler, and the volumetric oil content of the mixture is determined by the dependence of the output voltage level - 40 measure on the oil and water content. If the voltage at any part of the level gauge does not change, and the sample pressure , in the land of the boom, the reservoir is gas-saturated ( Fig. 3c, e). The volume of the filtrate is determined by the number of filled levels and the volume of gas by the known formula (1):

Vr (At „-l /«) - (ftj, -Pn). rdey is the volume of the sample receiver;

C is the volume of filtrate in the sampler;

 P | and reservoir pressure; p is the pressure in the sampler at the beginning of the sampling.

The results of the testing of a capacitive discrete level gauge installed in the tester of the reservoir tester confirm the possibility of separating the water-saturated (Fig. 4a), and the oil-saturated (Fig. 46) and gas-saturated (Fig. 40) collectors.

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The use of the proposed device for hydrodynamic studies of the plates compared to the known ones allows one to determine the current parameters of the inflow of formation fluids: composition, volumetric content, flow rate of liquid and gaseous components directly in the research process under borehole conditions with increasing accuracy of determining these parameters, and also viscosity fluids and filtration properties of the reservoir, creates the possibility of determining the phase permeability and significantly increases the reliability and reliability of the selected GOVERNMENTAL neftegazonasyschen- collectors due to the complex preparation and use of novel and known parameters.

At the same time, the productivity of research is significantly improved by reducing material costs and a significant part of the time required for the launching and lifting operations of the device in the well and the number of laboratory tests. -That most economically

ka and geological efficiency of hydrodynamic studies and exploration in general.

Claims (1)

Invention Formula Device for hydrodynamic research. formations, comprising a housing and a sampling receiver and a sampling container located therein, a rod with inlet and outlet valves and a channel with inlet and outlet nozzles for communicating with the cavities of the sampler and sampler, a pressure sensor and a fluid flow sensor, a pressure system and a sealing bashmak mounted on the housing, characterized in that, in order to improve the accuracy of research, it is equipped with an additional outlet valve mounted on the flap, with the outlet nozzle of the channel being installed between the outlet valves and, and the flow sensor of the fluid is made in the form of a capacitive discrete level gauge installed inside the sample receiver. about to ii g 3 5 FIG. 2 J g and 7 P and LL-Z R RP /} and, RLP O Sda Z ffoda t T oil FIG. four and Water P / W-- P8, Vm but C iltrat Felsh mixture - oil rataine (wg Shiltrat gas / W-- P8, Vm but ,1m