RU2522326C1 - Device to isolate problematic zones by profile packer with cylindrical sections at well drilling - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: device includes a profile packer with cylindrical sections and threaded connections, a shoe installed at its lower end with a back valve and a fishing head at the top, an expansion head made of several sections and consisting of a pipe string connection unit at the top and a lock unit from below, which is connected hermetically to the upper end of the profile packer with a fishing tool below for the shoe fishing head. The upper and lower ends of the profile packer are made as a longitudinal corrugated pipe with five and more branches. The lock unit above the profile packer is equipped with a special mandrel, which cone surface and the lower guide has protrusions for an inner surface of branches at the profile packer ends. The guide is made so that it can interact with an inner mandrel in the cylindrical section of the profile packer. The shoe is an assembled unit consisting of an inner insert with a fishing head and a valve placed hermetically in the cylindrical section of the packer lower end and a fixture interacting with the lower butt end of the profile packer and connected to the inner insert.

EFFECT: higher reliability, expanded technological capabilities.

5 dwg

Description

The invention relates to the oil and gas industry, and in particular to devices for isolating the zone of complication of a wellbore while drilling.

A known method of installing a profile shutter in the well (patent RU No. 2379464, E21B 29/10, publ. 01/20/2010, bull. No. 2), comprising connecting sections of profile pipes, lowering the shutter in the required interval, the upper and lower ends of the profile the overlap is made in the same shape as the sections of the profile pipes, the overlap is aligned, and the straightening tool is hermetically installed at the upper end, the lower end of the overlap is equipped with a guide cone with a through channel, and the overlap is adjusted the translational motion of the tool down straighten under the action of the overpressure created in the cavity above the straightening tool, wherein the straightening tool is extendable from legkorazburivaemogo material.

This method is implemented by a device comprising interconnected sections of profile pipes equipped with a guide cone from below with a through channel and a sliding straightening tool from above.

The disadvantages of this device are:

- a high likelihood of the overlap misalignment, since the translational movement of the sliding straightening tool downward under the influence of hydraulic pressure implies the presence of a sealing device above the straightening tool, but with large lengths of overlap and with a large number of joints of pipe sections, the sealing of the straightening tool may be broken, which will make it impossible to continue it work;

- the impossibility of tightly pressing the shutoff to the walls of the well due to the presence of only one section of the straightening tool, which can cause problems with sealing the shutoff and the passage of downhole equipment through the shutoff.

The closest to the claimed technical essence and the number of matching essential features is a device for isolating zones of complication of drilling a well with a profile overlap with cylindrical sections (patent RU No. 2374424, E21B 29/10, published on November 27, 2009, bull. No. 33). The known device includes a profile overlap with cylindrical sections and threaded connections mounted on the lower end of the overlap shoe with check valve and fishing head at the top, expanding head, consisting of several sections mounted on top of each other with decreasing in diameter working surfaces towards the overlap, and containing on top is the connection node with the pipe string, and on the bottom is the locking mechanism, hermetically connected to the upper end of the overlapper, with the catch below the catch a shoe head, the device further comprising an anchor assembly configured to interact with the walls of the well or profile blocker with increasing internal pressure, and a hydraulic jack installed sequentially below, a hydraulic centralizer and a bypass valve located above the expansion head, sections of which are made in the form of sliding punches with working diameters decreasing from section to section towards the overlapping side.

The disadvantage of this device is the presence of "end effect" (the ends of the overlap due to elastic deformation after distributing the overlapper with punches go inside their cylindrical sections, thereby reducing the diameters of the bore sections at the inlet and outlet of the overlap), which may subsequently cause problems with the passage of downhole equipment through overlapper.

The technical objectives of the invention are to increase the reliability and expand the technological capabilities of the device associated with the trouble-free passage of downhole equipment through it by creating at the ends of the overlap when it is installed in the well a socket with an inner diameter necessary for passing downhole equipment.

Technical problems are solved by a device for isolating complication zones with a profile cutter with cylindrical sections when drilling a well, including a profile cutter with cylindrical sections and threaded connections, a shoe with a check valve and a fishing head at the top at the lower end of the shutter, an expanding head consisting of several sections installed one above the other with diminishing working surfaces in the direction of the overlap, and containing from above a connection node to pubic pipe, and bottom - locking mechanism, tightly coupled to the upper end of Perekryvatel, catcher beneath fishing head shoe.

New is the fact that the upper and lower ends of the profile overlap are made in the form of a longitudinally corrugated pipe with five or more beams, while the locking mechanism above the overlap is equipped with a special mandrel, the conical surface and the lower guide of which are equipped with protrusions under the inner surface of the rays of the ends of the overlap, and the guide made with the possibility of interaction with the inner mandrel installed in the cylindrical part of the ceiling, the shoe is made prefabricated, consisting of an internal insert with villa valve head and sealingly disposed in the cylindrical portion of the lower end Perekryvatel and clamp interacting with the lower end Perekryvatel and connected to the inner insert, the inner insert is equipped with bottom outer conical surface adapted to expand the lower end of profile liner while moving downward.

In Fig.1 shows the upper part of the device, Fig.2 is the lower part of the device, Fig.3 is a view a in Fig.1 (enlarged), in Fig.4 and 5 are respectively sections BB and BB in figure 1 and 2.

A device for isolating the zones of complications with a profile cutter with cylindrical sections when drilling a well contains a cutter 1 (Fig. 1, 2) composed of profile pipes 2 (Fig. 2) with cylindrical sections 3 at the ends containing threads 4 for connection to each other. At the bottom of the overlap 1, a shoe 5 is installed with a check ball valve 6 and a fishing head at the top in the form of a cylindrical protrusion 7 with outer annular grooves 8. The top of the overlap 1 (Fig. 1) is equipped with an expanding head consisting of two or more sections 9 in the form of punches (on figure 1 shows one section 9, the rest are similar), mounted on top of each other with decreasing diameter working surfaces in the direction of the overlap 1, and containing on top the connection node with the pipe string (not shown in Fig.), and below the locking mechanism ISM 10 (FIG. 3), hermetically connected to the upper end of the overlap 1 (FIG. 1), with a catcher at the bottom in the form of a sleeve 11 with spring rings 12 inside under the annular grooves 8 (FIG. 2) of the protrusion 7 of the fishing head of the shoe 5. Moreover the locking mechanism 10 (figure 3) is made in the form of an external groove 13 above the sleeve 11 (figure 1) of the shoe trap 5 (figure 2), fixed in the inner protrusion 14 (figure 3) of the upper end of the overlap 1 (figure 1) and the sealing of the locking mechanism 10 (figure 3) is provided by the seal 15.

In this case, the upper and lower ends of the profile overlap 1 (Fig. 1, 2) are made in the form of a longitudinally corrugated pipe 16 (Fig. 4, 5) with five or more beams 17. The locking mechanism 10 (Fig. 3) is higher than the overlap 1 (Fig. .1) equipped with a special mandrel 18, the conical surface 19 and the lower guide 20 of which are equipped with protrusions 21 (Figs. 1, 4) under the inner surface of the beams 17 (Fig. 4) of the corrugated pipe 16 of the upper end of the overlap 1 (Fig. 1). The guide 20 is configured to interact with the inner mandrel 22 installed in the cylindrical part 3 of the ceiling block 1. The shoe 5 (FIG. 2) is made of a modular assembly consisting of an inner insert 23 with a through channel 24 with a check ball valve 6 connected above to the cylindrical protrusion 7 the fishing head and hermetically, due to the seal 25, located in the cylindrical part 3 of the lower end of the overlap 1. The shoe 5 is fixed from longitudinal movements upward with a latch in the form of a nut 26, interacting with the lower end face p rekryvatelya 1 and connected through the thread 27 with the inner shoe 5. The insert 23 with the inner insert 23 is fitted from below the outer conical surface 28 adapted to expand the lower end Perekryvatel 1 while moving downward.

The device operates as follows.

Before lowering into the well (not shown in Fig.), Pipe 16 (Fig. 5) with a corrugated lower end, in which shoe 5 (Fig. 2) is mounted so that the seal is screwed to the lower cylindrical part 3 of the overlap 1 with a thread 4 25 was located in the cylindrical part 3 of the pipe 16 (FIG. 5) of the overlap 1 (FIG. 2), and the outer conical surface 28 of the insert 23 of the shoe 5 tightly interacted with the beams 17 (FIG. 5) of the corrugated pipe 16 due to the nut 26 (FIG. 2), screwed on the thread 27 of the insert 23 to the stop in the lower end of the pipe 16 (figure 5) of the overlap 1 (figure 2).

Then the shutoff 1 is lowered into the well, sequentially connecting the cylindrical sections 3 with the help of thread 4 profile pipes 2 among themselves. After assembling the overlap 1, it is fixed at the wellhead and to the upper cylindrical part 3 (Fig. 1) of the overlap 1, a pipe 16 (Fig. 4) is screwed with a corrugated upper end with a guide 20 ( figure 1) with a locking mechanism 10 (figure 3). In this case, the inner protrusion 14 of the cylindrical part 3 (Fig. 1) of the pipe 16 (Fig. 4) due to the interaction with the outer groove 13 (Fig. 3) made on the outer surface of the inner mandrel 22 (Fig. 1) mounted on the guide 20 , reliably and tightly (thanks to a seal 15 (figure 3)) fixes the shutoff 1 (figure 1) on the pipe string.

Moreover, above the locking mechanism 10 (Fig. 3), a special mandrel 18 is mounted on the guide 20 (Fig. 1) so that its protrusions 21 (in order to prevent the overlap 1 from turning around the axis and uniform longitudinal distribution of its upper profile end) on the conical surface 19 entered the rays 17 (Fig. 4) of the pipe 16 of the upper end of the overlap 1 (Fig. 1). Above the mandrel 18, sections 9 of the expansion head and a connection unit with a pipe string are installed.

Next, the shutoff 1 continues to be lowered into the well on a string of pipes (drill pipes and / or weighted drill pipes, depending on the required total weight of the device for turning and calibration of the profile pipes 2 (figure 2) of the shutoff 1 (figure 1, 2)), while the borehole fluid fills the internal cavity of the overlap 1 through the through channel 24 (FIG. 2) and the check ball valve 6 of the shoe 5. After the shutter 1 is lowered into the complication zone isolation zone, an excess hydraulic pressure is created in the pipe string using the mud pump which, through the central channels of the expanding head and the guide 20 (FIG. 1), the mandrel 18 is transferred to the inner cavity of the overlap 1 and, by closing the check ball valve 6 (FIG. 2) of the shoe 5, straightens the profile tubes 2 of the overlap 1 until they are pressed firmly against the walls of the well, fixing the overlap 1 relative to the well.

Then, creating a load on the pipe string, using the mandrels 22, 18, 9 (Fig. 1), the upper corrugated pipe 16 (Fig. 4), cylindrical sections 3 (Figs. 1, 2) of the profile pipes 2 (Fig. 2) the overlap 1 and calibrate their profile sections to more tightly press the overlap 1 to the walls of the well, while the mandrel 18 (figure 1), moving downward, sliding protrusions 21 along the inner walls of the rays 17 (figure 4) corrugation of the upper pipe 16 of the overlap 1 (figure 1), at the same time distributes the conical surface 19 of the corrugation of the pipe 16 (figure 4), and section 9 (figure 1) the range of this head dorazdayut them completely to form the desired size of the socket inlet 1 Perekryvatel.

Upon reaching the locking mechanism 10 (figure 3) of the shoe 5 (figure 2), the sleeve 11 (figure 1) of the trap captures the protrusion 7 (figure 2) of the fishing head of the shoe 5, the spring rings 12 (figure 1) of the sleeve 11 enter engagement with the annular grooves 8 (figure 2) of the protrusion 7 of the fishing head of the shoe 5, securely fixing it in the expanding head. At the same time, thanks to the conical surface 28 of the insert 23 of the shoe 5, the corrugation of the lower pipe 16 (FIG. 5) is distributed, which is finally distributed when the mandrels 18 (FIG. 1) and sections 9 of the expansion head pass through it, forming at the end of the overlap 1 (FIG. 2) ) bell with the required inner diameter.

Then, the arrangement consisting of a shoe 5, a locking mechanism 10 (Fig. 3) with a mandrel 18 (Fig. 1), sections 9 of the expanding head on the pipe string are removed from the well.

The proposed device has great reliability and a wider range of technological capabilities due to the creation at the ends of the overlap when installing the socket of the required size due to the corrugated pipe sections at the ends of the overlap, the corrugation of which during radial expansion eliminates the "end effect" (radial narrowing) due to the absence of elastic deformation, which allows downhole equipment to safely pass through the shutoff.

Claims (1)

A device for isolating complication zones with a profile cutter with cylindrical sections when drilling a well, including a profile cutter with cylindrical sections and threaded connections, a shoe with a check valve and a fishing head at the top at the lower end of the overlap, an expanding head consisting of several sections mounted on top of each other with decreasing diameters of the working surfaces in the direction of the overlap, and containing on top the connection node with the pipe string, and below the locks a mechanism hermetically connected to the upper end of the overlap, with a catcher below the catch head of the shoe, characterized in that the upper and lower ends of the profile overlap are made in the form of a longitudinally corrugated pipe with five or more beams, while the locking mechanism above the overlap is equipped with a special mandrel, conical the surface and the lower guide of which are equipped with protrusions under the inner surface of the rays of the ends of the overlap, and the guide is made with the possibility of interaction with the inner mandrel installed in the cylindrical part of the overlap, the shoe is prefabricated, consisting of an inner insert with a fishing head and a valve, hermetically placed in the cylindrical part of the lower end of the overlap, and a latch interacting with the lower end of the overlap and connected to the inner insert, the inner insert being equipped with an outer bottom a conical surface configured to expand the lower end of the profile overlap when moving down.

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