SU1135899A1 - Down-hole tester - Google Patents

Abstract

Borehole Isotale. Cases with piston, chambers filled with working fluid, one of which is made of elastic material, electric drive, core assembly, sealing ring and pressure sensors, characterized in that, in order to improve the accuracy of testing by providing characteristics measurement the disturbance field outside the well bore directly in the process of hydrodynamic action, it is equipped with a rod with washers, a number of; additional sealing rings and electrodes, while lotnitelnye rings successively mounted on the housing vozmozhnostyu.vzaimodeystvi washers rod which is attached to the piston, and the electrodes are placed on the sealing rings by contacting them with the borehole walls. (P

Description

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The invention relates to the field of operation (in particular, in particular, to devices dp of operational well study of reonoronpoMjic characteristics of oil and gas reservoirs.

The purpose of the invention is to increase the accuracy of the test by making it possible to measure the characteristics of the disturbance field outside the borehole.

This goal is achieved by the fact that the borehole tester is equipped with a field geophysical measuring unit, Hanpimep electrodes, mounted on a sealing ring.

Figure 1 presents the circuit design of the downhole tester; Fig. 2 shows the PDC {cipial diagram of the measurement setup.

The well test tester contains case 1, in which piston 2 with rod 3 is placed, electric drive 4 telemetry circuit 5. The piston forms two closed chambers b and 7 filled with working fluid in the device case. The walls of the chamber 6 are made of elastic material for interaction with the well, on the housing 1 a core assembly is installed, including a cone 8, thrust plates 9 and a movable washer 10. On the housing there are elastic sealing rings 11-14, limiting washers 15-18, found Movable washers 19–22, located on the rod, cylinder 23 with pistons 24 and 25 placed in it,. Pressure sensors 26 and 27 are located on the core 2 on the side of its ends. On the elastic sealing rings 11-14 placed electrodes 28.

The device works as follows.

The logging device is lowered into the well to the required depth. In this case, the piston 2 finds the chamber 7 in the lower position, and the sealing rings 11-14 and the dies 9 of the core assembly do not protrude beyond the overall dimensions of the device i.e. occupy the transport position This position of the core and sealing units ensures the free passage of the device through the wellbore;

In the study interval, the electric drive 4, using a signal through the logging cable, actuates the articulation unit of the piston 2 with the rod 3. In this case, the rod 3 will begin to move upward relative to the device body the movable abutments 9 of the anchor angle along the cone 8 to the stop

Plates in the walls of the well. This achieves a rigid fixation of the entire device in a predetermined study interval. The movement of the movable washers 19 and 20 leads to the compression of the elastic sealing rings II and 12 and thereby to the separation of the wellbore along the entire perimeter. As soon as the device is fixed with the help of the crust assembly, piston 2 begins to move to the upper position of chamber 7. At the same time, the working fluid from chamber 7 flows through the channels into cylinder 23 and moves pistons 24 and 25. Moving pistons 24 and 25 drives moving washers 21 and 22, which compress the elastic sealing rings 13 and 14. The protrusion beyond the overall dimensions of the device, the reinforcing rings 13 and 14 complete the separation of the well bore into three zones: subpacker 29, interpacker 30 and perturbation zone 31. Simultaneously with the disconnected By moving the borehole into three zones, moving the piston 2 to the upper position of the chamber 7 leads to a reduction in the volume of the elastic chamber 6. The chamber 6, interacting through the wall of elastic material with interpacker zone 3, creates a depression for the studied interval adjacent to the interpacker zone of the well bore. The moment and magnitude of the depression created in the inter-packer zone are marked on the surface according to the pressure sensor readings, times the space in the chamber 6. This also provides control over the operation of the device as a whole,

As a result of depressing session disturbances in the interpackage zone of the wellbore, the interval under study (the reservoir will begin to release moistened fluids into the well. At the same time, the pattern of fluid movement through the reservoir, the composition and intensity of fluids entering the wellbore will be observed (observed) on the surface indications of the field geophysical measuring installation placed on the sealing rings of the device. The measuring device of the device containing electrodes implements a set of probes by a well Metrii, KOTopbiie have different geometric measurement factors and different spatial directionality. This allows us to observe the possible heterogeneity of the study interval during its testing. Probes that study the characteristics of different fields (natural and artificial) can be included in the measurement setup of the device. ), such as dielectric, temperature, sodophioic (radioactive), noise, acoustic, etc. After completing several test cycles with a change in the degree of depression In our first disturbance, we study the || interval, estimate the dynamic geologic and field characteristics of oil and gas reservoirs. 99L The use of the proposed device for the study and evaluation of the geological and field characteristics of the deposition of the scientific research institute of rocks in wells provides simplicity of the equipment used, expression and high performance tests. The study of the geological and field characteristics of rocks is carried out directly in the process of testing them (hydrodynamic impact on them), which allows us to evaluate the dynamics of work as the whole test interval as a whole, rak and its components, with an assessment of the nature of the fluvd. The conditions for the formation of cones for the stimulation of the bottom water of water-bearing oil deposits and gas breakthrough cones for the gas cap directly under reservoir conditions are established and established. Unambiguously identified AND estimated sources. (Outgoing intervals) and paths (current lines) of contamination of useful fluids | by strangers.

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Claims (1)

A Borehole Tester, comprising a body with a piston, chambers filled with a working fluid, one of which is made of elastic material, an electric drive, an anchor assembly, a sealing ring, and pressure sensors, which can be In order to increase the accuracy of the test by providing the ability to measure the characteristics of the disturbance field outside the wellbore directly during hydrodynamic action, it is equipped with a rod with washers, a number of additional sealing rings and electrodes, while shim rings are sequentially mounted on the housing with the possibility of interaction with the washers of the rod, which is attached to the piston, and the electrodes are placed on the sealing rings from the side of their contact with the walls of the well. ♦