RU2065921C1 - Device for treating drilled holes - Google Patents

Abstract

FIELD: mining industry. SUBSTANCE: in vibration treatment before normal operation and at overhaul of drilled holes, productive layer is subjected to combination treatment by low and high frequency vibration by device having body with horizontal passage which accommodates axle mounted on which for possible rotation is cam for periodic closing of tangential supply channel leading to horizontal hole and axial outlet hole in body. Horizontal hole is blocked at side with rings which are internally tapered. Axle ends are seated in ring openings through clearance and at outer sides they are fixed in disks installed flush with horizontal hole. Disks have sector openings. EFFECT: simple design and reliable operation. 5 dwg

Description

 The invention relates to the mining industry, in particular to devices for vibration processing of bottom-hole zones of oil, gas and water wells.

 A device for developing and processing a well is known, including a housing with an axial channel, a chamber in the housing hydraulically connected to the axial channel, and a breaker.

 The disadvantage of this device is that to create a flow directed into the well, it is necessary to use sophisticated equipment (ejector pump) and additional sealing of the annular space of the well with a packer. The device is located far from the reservoir, therefore, the created by it area of the discharge have a less intense effect.

 A device for well development and processing is also known, including a housing with an axial output channel and a feed channel directed to a chopper mounted on the axis with the possibility of rotation and periodic overlapping of the axial output channel.

 The disadvantage of this device is that it has a massive and complex shape breaker. In addition, the device allows you to vibrate the bottom-hole zone of the reservoir only with low-frequency pulses.

 The essence of the invention lies in the fact that the device for developing and processing the well is provided with rings with conical contractions and disks with sector windows, a horizontal hole is made in the housing, the breaker is made in the form of a cam and placed with an axis in a horizontal hole, while the breaker is placed in its middle parts, the ends of the axis are passed through the rings with a gap and are fixed on the outside with respect to the last disks installed flush, and the inlet channel is tangential to the horizon flax hole.

 The technical result of the invention is to simplify the design and increase the efficiency of vibration processing due to complex low-frequency and high-frequency pressure fluctuations.

 In FIG. 1 shows a General view of the device in section; in FIG. 2, section AA in FIG. 1; in FIG. 3 section BB in FIG. 1; in FIG. 4, section BB in FIG. 1; in FIG. 5 view of the device from the outside.

 The device for the development and processing of the well consists of a housing 1 with a connecting thread 2 for tubing. In the middle part of the housing 1, a through horizontal hole 3 is made, which is blocked on both sides by, for example, screwed rings 4 with seals 5. The rings 4 have conical narrowings 6 from the diameter of the horizontal hole 3 to the hole 7 of the ring 4 and the conical extension 8 from the outside. In the upper part of the housing 1, a tangential inlet channel 9 is made in the middle of the horizontal hole 3, and in the lower part of the housing 1 there is an axial output channel 10 from the cylindrical cavity 3. Inside the horizontal hole 3 in its middle part is rotatably mounted on the axis 11, for example by the pressed bearing 12, the chopper 13 of the tangential inlet channel 9 and the axial output channel 10, made in the form of a cam. The ends of the axis 11 are passed through the rings 4 with a gap and are fixed on the outside with respect to the last disks 14, which are locked by nuts 15. The outer diameter of the disks 14 corresponds to the diameter of the horizontal hole 3, and they abut against the rings 4, which in turn prevents their lap . The disks 14 are made with sector windows 16.

 A device for the development and processing of wells works as follows.

 The device is lowered onto the tubing into the zone of the productive formation of the well and flushing begins. The process fluid through the tangential inlet channel 9 enters the horizontal hole 3, where it acquires accelerated rotation according to the law of conservation of momentum, entraining the cam 13, which periodically closes the tangential 9 and axial 10 channels, causing pressure pulsations. An intermittent low-frequency fluid stream flowing from the axial outlet channel 10 flushes the bottom from the sediment, and then the vibratory stream moves up the annular space between the tubing and the casing. Low-frequency oscillations of the liquid, reflected on various surfaces, periodically fall into resonance, which increases the area subject to vibration processing, since pressure pulses with a larger amplitude propagate further. This allows, without repeated movements, to destroy the structure of resinous and paraffin oil deposits on the walls of the casing and perforations, to reduce the viscosity and surface tension of oil in the pore space of the formation at a greater distance. At the same time, the rotating fluid flow in the horizontal hole 3 bifurcates, acquiring a rotational-translational motion. The rotating flow in the conical contractions 6 accelerates its rotation, causing vortices with an annular rarefaction zone along axis 11, filled with a vapor-gas phase, cavitation cavities and bubbles that periodically collapse. Unstable, due to the heterogeneity, the vortices rush into the annular gaps between the rings 4 and the axis 11 at the exit, when they expand sharply on the cones 8 (in the high pressure zone), the cavitation rings begin to collapse en masse, generating high-frequency pressure pulses, which through sector windows 16 of the disks 14 act directly on the casing wall. At the moment the cam 13 closes the tangential supply channel 9 and the axial output channel 10, the low-frequency pressure pulse generator affects the high-frequency pulse generator. So, at the moment of closing the tangential channel 9 and the opening of the axial channel 10, the rotating flow slows down and expires from the annular gap of the hole 7 with the axis 11 by a conventional centrifugal flow, effectively washing deposits from the walls of the casing, and when the axial output channel 10 is blocked, a sharp jump occurs pressure inside the horizontal hole 3, as a result of which the rotating flow is accelerated more intensively with the effect of cavitation. In the process of coagulation of cavitation bubbles opposite perforation channels in the reservoir, the filtration of formation fluids diluted by low-frequency pulses into the well and the cleaning of pore channels are intensified.

 The proposed device has a simple design and operating principle without increased energy costs, and creating periodic hydraulic pulses of high pressure, accompanied by cavitation shocks, significantly increases the effect of vibration processing. YYY2 YYY4

Claims (1)

 A device for developing and processing a well, comprising a housing with an axial output channel and a feed channel directed to a chopper mounted on the axis with the possibility of rotation and periodic overlapping of the axial output channel, characterized in that it is provided with rings with conical contractions and disks with sector windows, a horizontal hole is made in the housing, the breaker is made in the form of a cam and placed with an axis in a horizontal hole, while the breaker is placed in its middle part, the ends of the axis are skipped through ring with a gap and fixed to the outer side with respect to the last disc mounted countersunk and tangential supply channel is formed in relation to the horizontal hole.

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