RU211899U1 - DEVICE FOR HYDRODYNAMIC LOGGING - Google Patents

Abstract

The claimed utility model relates to mining and is intended for hydrodynamic studies of open holes. The technical objective of the utility model is to increase the productivity and efficiency of the device in the study of low-permeability rocks. A device for hydrodynamic logging, containing electromechanical drives, a clamping mechanism with a packer, a sample receiver with differential pistons and a hydraulic drive made in the form of a double-acting hydraulic cylinder with a single-sided rod, the chamber with the rod is partially filled with hydraulic fluid. In this case, the chambers of said hydraulic cylinder are connected by hydraulic channels to the dual control valve and the chambers of another hydraulic cylinder with a piston in contact with the pusher of the said valve, the last channel is connected to a buffer hydraulic cylinder, the piston of which is in contact with the differential piston rod of the sample receiver. A pressure sensor is installed on the inlet channel of the sample receiver chamber, and the linear displacement sensor is connected to the mentioned rod of the differential piston of the sample receiver. An electromagnetic valve is installed in the hydraulic channel between the double control valve and the buffer hydraulic cylinder, which controls the hydraulic connection of the buffer hydraulic cylinder with the chamber of the double-acting hydraulic cylinder through the double control valve.

Description

The claimed utility model relates to mining and is intended for hydrodynamic studies of open holes.

A device for hydrodynamic studies is known (ed. St. USSR 600293, IPC E21B 49/00), containing a sample receiver with a separating piston, a telescopic piston interacting with the separating piston, the end area of the telescopic piston is less than the area of the separating piston. The disadvantage is the limited number of research cycles per trip of the tool into the well and the need to maintain it for re-descent.

Known small-sized multiphase hydrodynamic logging tool Multiphase Flow Measurement (MFT) from Weatherford (www: weatherford.com), made in the form of two sealed blocks, separated by a multi-lever pressure system of the pantograph type, with a power supply, a pressure system drive, a telescopic channel connecting the hole in a sealing element with a piston cylinder chamber connected by a channel with two pressure sensors of different accuracy classes and an equalizing valve, a chamber.

After the sealing element is pressed against the well wall, depression is created and fluid is withdrawn from the formation by a pump, which complicates the process of hydrodynamic formation disturbance, making it dependent on the pump performance.

The closest in technical essence to the claimed is a device for hydrodynamic well logging (patent RU 2737594 C1, priority 04/03/2020, IPC E21V 49/08) made in the form of two blocks: a sample receiver and a clamping system, while the first block contains an electromechanical drive, a hydraulic drive the sample receiver is made in the form of a double-acting hydraulic cylinder with a single-sided rod, the main hydraulic channel, a double control valve, a buffer hydraulic cylinder, a small hydraulic cylinder with a piston in contact with the pusher of the said valve, pressure and linear displacement sensors, the second block contains an electromechanical drive, a hydraulic drive, a pressure control mechanism systems, packer, solenoid valve, ballast chamber, hydraulic relay.

The device operation algorithm is strictly determined. The operator sets the device to a predetermined depth, turns on the registration of sensor readings, turns on the drives, then the process follows a given algorithm, observing the readings of the sensors, the operator completes the study at a certain moment, returns the device to its original state. This device operation algorithm extremely simplifies the operator's work, is effective in the study of rocks with medium and high permeability, but in the case of the study of low-permeability rocks, the duration of the study objectively increases and the likelihood of premature completion of the test with an ambiguous result increases.

The objective of the claimed utility model is to increase the productivity and efficiency of the device in the study of low-permeability rocks.

According to the utility model, the problem is solved by the fact that in a device for hydrodynamic logging, consisting of two blocks: a sample receiver and a pressure system with electromechanical drives, in a sample receiver block containing a hydraulic drive made in the form of a double-acting hydraulic cylinder with a single-sided rod, a double-control valve, the main hydraulic channel, a small hydraulic cylinder with a piston in contact with the pusher of the said valve, a buffer hydraulic cylinder with a piston in contact with the differential piston of the sample receiver, pressure and linear displacement sensors, the main hydraulic channel is equipped with an independently controlled solenoid valve that hydraulically connects the buffer hydraulic cylinder through the valve double control with a large chamber double acting hydraulic cylinder.

The essence of the proposed utility model is illustrated by the following description and drawings.

In FIG. 1 (a, b, c) a fragment of a general view illustrating the operation of the sample receiver unit.

In FIG. 2 shows pressure (P) and linear displacement (L) readings (lower curve) in a low-permeability formation.

The inventive device for hydrodynamic logging consists of two blocks: the first block contains an electromechanical drive (not shown in Fig. 1), the sample receiver hydraulic drive is made in the form of a double-acting hydraulic cylinder 1 with a single-sided rod 2, a piston 3, a small cylinder with a piston 4 in contact with the pusher 5 double control valve 6, the main hydraulic channel is equipped with an independently controlled solenoid valve, which hydraulically connects the buffer hydraulic cylinder 9 through the dual control valve 6 with a large chamber 8 of the double-acting hydraulic cylinder 1 (Fig. 1a).

The operation of the device is carried out as follows.

The device is lowered into the well on a logging cable at a given depth from the ground power supply unit, voltage is applied to the power supply unit of the device, the electromechanical drives (not shown in Fig. 1) of both units of the device are switched on, the clamping system (not shown in Fig. 1) is activated, piston 3 approaching the upper end position, it squeezes the hydraulic fluid out of the chamber 11 through the channel into a small hydraulic cylinder with a piston 4, the latter moving by the pusher 5 opens the valve 6, while the solenoid valve 7 is in the open state, the fluid from the formation entering the chamber 12 moves the differential piston 13 (Fig. 1b), the piston 10 begins to squeeze out the hydraulic fluid from the buffer hydraulic cylinder 9 through the solenoid valve 7 and the dual control valve 6 into the large chamber 8 of the double-acting hydraulic cylinder 1, as a result, the pressure drops, creating a disturbance in the formation (Fig. 2, time t ₀ ).

Further, after some time (t ₁ -t ₀ ) FIG. 2 a, b according to the readings of the sensor L of linear displacements, the absence of inflow is stated (Fig. 2 a), and in the presence of a weak inflow (Fig. 2 b), the duration of the complete filling of the sample receiver is predicted. At time t ₁ , the solenoid valve 7 is turned on (Fig. 1 c), the main hydraulic channel is blocked, which excludes the flow of hydraulic fluid from the buffer hydraulic cylinder 9 into the large chamber 8 of the double-acting hydraulic cylinder. The process from the "waiting inflow phase" (Fig. 2a) or weak inflow (Fig. 2b) passes into the "reservoir pressure recovery" phase. At the time t ₂ in the absence of inflow (Fig. 2 a) or with a weak inflow (Fig. 2 b), after registering the formation pressure P _pl , the power to the electromechanical drives is turned off (not shown in Fig. 1), while the clamping system returns to its original state (folds), the valve 6 remains open, the sensor Ρ registers the pressure in the well P _well , while the solenoid valve 7 remains on, which prevents the hydraulic fluid from flowing from the buffer hydraulic cylinder 9 through the valve 6 into the chamber 8 of the double-acting hydraulic cylinder 1 and filling chamber 12 of the sample receiver with drilling mud.

Power from the ground unit is supplied again, but with reverse polarity, piston 3 begins to move to its original position, valve 6 closes, the operator turns off solenoid valve 7.

Electromechanical drives, continuing to work, return the device to its original state (Fig. 1a).

In the case of a weak inflow (Fig. 2b), the following expression is used to calculate the permeability:

k - permeability coefficient; μ - dynamic viscosity;

- объем флюида отобранного за время (t₁-t^*) при депрессии ΔPi; s - площадь поршня 13;

- перемещение поршня 13 до контакта с поршнем 14;

- перемещение поршня 13 за время _Δti=(t₁-t^*); А - коэффициент, учитывающий геометрию притока.

- volume of fluid taken over time (t ₁ -t ^* ) at depression ΔPi; s is the area of the piston 13;

- moving the piston 13 to contact with the piston 14;

- displacement of the piston 13 in time _Δ ti=(t ₁ -t ^* ); A - coefficient taking into account the geometry of the inflow.

The installation of solenoid valve 7 in the main hydraulic channel between the buffer hydraulic cylinder, the double control valve and the larger chamber of the double-sided hydraulic cylinder allows the operator, in the absence or weak inflow, by turning on the solenoid valve 7, to transfer the process from the "inflow waiting phase" to the "reservoir pressure recovery phase" and complete a test with an unambiguous result, either with fixation of the complete absence of inflow (in the absence of pressure growth), or with a weak inflow from the formation with formation pressure registration and the possibility of determining the permeability (according to the above formula), while significantly reducing the test duration, which increases the productivity of the device and further reduces the likelihood of an emergency due to sticking of the device.

Claims (1)

A device for hydrodynamic logging, containing electromechanical drives, a clamping mechanism with a packer, a sample receiver with differential pistons and a hydraulic drive made in the form of a double-acting hydraulic cylinder with a single-sided rod, a chamber with a rod is partially filled with hydraulic fluid, while the chambers of said hydraulic cylinder are connected by hydraulic channels with a double-acting valve control and chambers of another hydraulic cylinder with a piston in contact with the pusher of the said valve, the latter channel is connected to the buffer hydraulic cylinder, the piston of which is in contact with the rod of the differential piston of the sample receiver, a pressure sensor is installed on the inlet channel of the sample receiver chamber, the linear displacement sensor is connected to the said rod of the differential piston of the sample receiver, characterized in that in the hydraulic channel between the double control valve and the buffer hydraulic cylinder, an electromagnetic valve is installed that controls the hydraulic connection of the buffer leg hydraulic cylinder with a double-acting hydraulic cylinder chamber through a dual control valve.

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