SU872742A1 - Device for detecting the operating layers of formation - Google Patents

Description

The invention relates to a measurement technique and can be used in the oil and gas producing industry to determine the location and intensity of the formation fluid in the well.

Known downhole flowmeter, comprising a cylindrical body with a rotor unit placed in it,

The main components of which are the crutch and magnetic device mounted on the same shaft. A lobe switch is installed above the magnetic device consisting of circumferential permanent magnets, which, during rotation of the magnetic device, receive and transmit to the surface the corresponding electric signals. The meter body has a series of longitudinal slit-like windows through which formation fluids can enter the interior of the apparatus and force the impeller to rotate. The latter is structurally designed in such a way that it rotates only under the action of a jet directed perpendicular to the axis of the well and remains stationary when the fluid moves coaxially to the apparatus. The intensity of the jet determines the speed of rotation of the impeller and, respectively, the frequency of transmission of electrical signals to the surface 1.

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The disadvantages of the downhole flowmeter include: the inability to determine the location and intensivg NOSTA arrival (overflows / skva zhinnogo fluid into apast} nevozmozh15 in the determination of the location entry of formation fluid into the wellbore through the perforations and disorders in the casing, finding schies vsch1e shoe pump-compression weed pipes.

Closest to the present invention, there is a device for allocating operating formation intervals, comprising a housing with a sound oscillation receiver disposed therein with an amplifier of 2 J.

A disadvantage of this device is the unwinding of the noise signal, which reduces the accuracy of determining the location of the perforations and disturbances in the column, which is found to be rough.

The purpose of the invention is to improve the accuracy of the separation of the working intervals of the reservoir located above the tubing shoe.

The goal is achieved by the fact that the device is equipped with bellows partitions, one ends of which are rigidly fixed on the upper and lower bases {of the resorpus, while others are installed with the possibility of pressing against the walls of the tubing.

The drawing shows a diagram of an apparatus for isolating operating intervals.

The device comprises a housing I, to the upper and lower parts of which the upper and lower bellows partitions 2 are rigidly attached. For ease of tripping operations carried out in the axial compressor pipe 3, the bellows 2 are provided with guides 4. In the case 1 between the bellows 2 is placed a sound amplification receiver 5 with a pre-amplifier (not shown), which perceive and amplify the transverse vibrations transmitted by the fluid in the actively working interval of the casing 6 to the section of the tubing 3, enclosed between the 2 phones,

The device works as follows.

When lowering over tubing pipes 3 devices for separating working intervals, the receiver., 5 sound vibrations perceives the ac: tic oscillations excited by the wall of the tubing 3 when a turbulent jet of fluid flows through it through a perforation hole, or in column 6. It should be noted that along with transverse waves 14 and other types of waves (longitudinal, surface, etc.) occur in the wall of the tubing 3. Fluid operating intervals below and or more than the interval to be divided, it also creates acoustic oscillations in the tubing tube 3, which is a peculiar waveguide propagating the sound vibrations.

Thus, various types of waves propagating through the tubing pipe 3 excited by various sound sources (different intervals of fluid inflow into the well or absorption by the formation) can coincide in some sections of pipe 3 in amplitude and this area on the surface is perceived as working. In order to exclude the influence of these waves on the accuracy of the separation of working intervals in the well, in this design use bellows 2, rigidly fixed on the case I of the device. The outer ends of the bellows are tightly pressed against the wall of the tubing 3, preventing the propagation of waves through it. Acoustic oscillations receiver 5 picks up acoustic oscillations only when they are excited by the walls of a section of pipe 3 that is sandwiched between bellows 2, or, in other words, the receiver perceives acoustic oscillations only during well operation intervals. For convenience of production tripping, the bellows 2 is provided with guides 4.

Claims (2)

1. US patent number 3982433, CL. 73-155, 1976. 2. Instructions for the integrated study of gas and gas condensate wells. M., Nedra, 1971 c, 172-177 (prototype). ff