RU2584484C1 - Device for lowering and installation of profile shutter in well - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, specifically to devices for isolation of troublesome zone of well bore during drilling. Device for lowering and installation of profile shutter in well includes a shaped shutter with cylindrical sections and threaded joints, installed on lower end of shutter shoe with check valve and fishing head on top, expanding head composed of several sections arranged one above another with diameter decreasing towards working surfaces of shutter, and contains top connection to pipe string, locking mechanism tightly connected to upper end of shutter with catcher below tool extractor shoe upper and lower ends of profile shutter are made in form of longitudinal corrugated pipe with five and more beams, locking mechanism above shutter is equipped with a special mandrel, end of conical surface of which is designed to interact with inner core, installed in cylindrical part of shutter. Conical surface of a special mandrel is smooth, inner mandrel is made up of top and bottom expanders, and expanding head is provided with hollow cylindrical rod with side hole, connected at bottom with lower expander, and from above - equipped with a stop, special mandrel and top reamer are installed on cylindrical rod with possibility of restricted upward movement to stop against overpressure inside shutter, wherein top reamer is tightly installed in cylindrical part of shutter, is equipped with a lock fixing on cylindrical rod of push-down, and lateral through channel made with possibility of interaction with side hole of cylindrical rod in upper extreme position, upper top expander is equipped with conical surface with apex angle which enables expansion of end of shutter after distribution of excess pressure of shaped tubes of shutter.

EFFECT: technical result consists in improvement of reliability.

1 cl, 3 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 device for isolating zones of complication of drilling a well with a profile overlap with cylindrical sections is known (patent RU No. 2374424, E21B 29/10, publ. November 27, 2009, bull. No. 33). This device includes a profile overlap with cylindrical sections and threaded connections mounted on the lower end of the overlap shoe with a check valve and a fishing head at the top, expanding head, consisting of several sections mounted on top of each other with decreasing 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 overlap, with the catcher below under the fishing rod shoe shoe, moreover, the device further comprises an anchor unit, configured to interact with the walls of the well or profile block with increasing internal pressure, and sequentially installed below the hydraulic jack, hydraulic centralizer and 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 disadvantages of this device are:

- great effort when distributing the upper cylindrical end of the overlapper with punches, which forces to increase the weight of the pipe string with the help of weighted drill pipes or use a jack with an anchor;

- the presence of an “end effect” (the cylindrical ends of the overlapper, due to elastic deformation after the overlap is distributed by the punches, extend into the extended sections, thereby reducing the diameters of the flow cross sections at the inlet and outlet of the overlap), which may subsequently cause problems with the passage of downhole equipment through the overlap.

Closest to the claimed technical essence and the number of matching essential features is a device for isolating complication zones with a profile overlap with cylindrical sections when drilling a well (patent RU No. 2522326, E21B 29/10, published on July 10, 2014, bull. No. 19) comprising a profile overlap with cylindrical sections and threaded connections mounted on the lower end of the overlap shoe with a check valve and a fishing head at the top, an expanding head consisting of several sections installed by d above the other with working surfaces decreasing in diameter in the direction of the overlap, and containing on top a connection node with a pipe string, and below - a locking mechanism hermetically connected to the upper end of the overlap, with a catcher below the catch head of the shoe, the upper and lower ends of the profile overlap made in the form of a longitudinally corrugated pipe with five or more beams, while the locking mechanism above the ceiling is equipped with a special mandrel, the conical surface and the lower guide of which are equipped with in steps under the inner surface of the beams of the ends of the overlapper, the guide being made to interact with the inner mandrel installed in the cylindrical part of the overlapper, the shoe is made prefabricated, consisting of an internal insert with a fishing head and a valve, hermetically placed in the cylindrical part of the lower end of the overlapper, and a latch, interacting with the lower end of the overlap and connected to the inner insert, and the inner insert is equipped with a bottom outer conical surface, in made with the possibility of expanding the lower end of the profile overlap when moving down.

The disadvantages of this device are:

- a lot of effort when distributing the upper longitudinally corrugated end of the overlapper with a special mandrel located above the overlap, since redistributing the metal from top to bottom towards the hard seal of the overlap requires more effort than from the inside of the overlap from bottom to top;

- uncontrolled process of distribution of the upper end of the overlap, when the load during its passage by the mandrels sharply changes from maximum to minimum, which can lead to breakage of the hydraulic jack.

An object of the invention is to increase the reliability of the device by reducing the load on the mandrel tool when distributing the upper end of the overlap due to the redistribution of the distribution force from the bottom up towards the unmade end of the overlap, as well as receiving a signal at the wellhead in the form of reducing pressure inside the pipe string to complete the installation of the hydraulic pressure and simultaneous distribution of the upper end of the overlap.

The technical problem is solved by a device for launching and installing a profile cutter in the 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 working surfaces decreasing in diameter in the direction of the overlap, and containing the connection node with the pipe string on top, and the locking mechanism below, ger The upper and lower ends of the profile overlap are made in the form of a longitudinally corrugated pipe with five or more beams, which is connected to the upper end of the overlapper, with the catcher below under the fishing head of the shoe, while the locking mechanism above the overlap is equipped with a special mandrel, the end of the conical surface of which is made with the possibility of interaction with the inner mandrel installed in the cylindrical part of the overlapper.

What is new is that the conical surface of the special mandrel is smooth, the inner mandrel is prefabricated, consisting of the upper and lower expanders, and the expanding head is equipped with a hollow cylindrical rod with a side hole connected to the bottom of the expander at the bottom and equipped with a stop at the top, while the special the mandrel and the upper expander are mounted on a cylindrical rod with the possibility of limited upward movement to the stop under the action of excessive pressure inside the overlap, the upper expander hermetically installed in the cylindrical part of the overlap, equipped with a locking mechanism securing to the cylindrical rod from shifting down, and a side through channel configured to communicate with the side hole of the cylindrical rod in the upper extreme position, the upper reamer having a conical surface with an angle at the apex, allowing expansion of the upper end of the overlap after distribution by overpressure of the profile pipes of the overlap.

In FIG. 1 shows a general view of the device, FIG. 2 - remote element A in FIG. 1 (enlarged), in FIG. 3 is a section BB in FIG. 1 (increased).

A device for launching and installing a profile shutter in a well includes a shutoff device 1 (Fig. 1), consisting of profile pipes (not shown in Fig.) With cylindrical sections and threaded joints at the ends, a shoe (not shown in Fig.) At the lower end of the overlap 1 (Fig. 1) with a check valve and a fishing head (not shown in Fig.), Expanding heads 2 from above.

The expanding head 2 consists of two or more sections 3 in the form of punches (in Fig. 1 one section 3 is shown, the others are made similarly), mounted one above the other with decreasing in diameter working surfaces towards the overlap 1 and the connection unit with the pipe string (on Fig. not shown) above the sections 3, and from below - the locking mechanism 4 (Fig. 2). The locking mechanism 4 is hermetically, thanks to the cuffs 5, 6 (Fig. 1), connected to the upper end of the overlap 1 due to the circular groove 7 (Fig. 2) on the outer surface of the lower expander 8 (Fig. 1, 2) of the inner mandrel 9 (Fig. . 1) connected by a cylindrical rod 10 with an expanding head 2, interacting with the inner protrusion 11 (Fig. 2) of the cylindrical part 12 (Fig. 1, 2) of the upper end of the overlap 1 (Fig. 1) and holding it from shifting down. In addition, the locking mechanism 4 (Fig. 2) has a bottom catcher 13 (Fig. 1) under the fishing head of the shoe in the form of a bell 14 with locking rings 15.

The upper and lower ends of the overlap 1 to prevent elastic deformation during their distribution are made in the form of a longitudinally corrugated pipe 16 (Fig. 3) with five or more rays 17. Moreover, the locking mechanism 4 (Fig. 2) above the overlap 1 is equipped with a special mandrel 18 (Fig. 1), the end face 19 of the conical surface 20 of which is made with the possibility of interaction with the upper expander 21 of the inner mandrel 9, installed hermetically (thanks to the cuffs 5, 6) in the cylindrical part 12 of the overlap 1.

Moreover, the conical surface 20 of the special mandrel 18 is smooth to reduce friction during distribution, the cylindrical rod 10 of the expansion head 2 is hollow with a side opening 22 and equipped with a stop 23 on top. Moreover, the special mandrel 18 and the upper expander 21 of the inner mandrel 9 are mounted on the cylindrical rod 10 with the possibility of limited movement up to the stop 23 under the action of excessive pressure inside the overlap 1.

The upper extender 21 of the inner mandrel 9 is equipped with a locking mechanism in the form of a locking ring 24, fixing it (thanks to the mating radial grooves 25) on the cylindrical rod 10 from shifting down, and a side through channel 26, made with the possibility of communication with the side hole 22 of the cylindrical rod 10 in upper extreme position. In addition, the upper expander 21 on top is equipped with a conical surface 27 with an angle at the apex, which allows the expansion of the upper corrugated pipe 16 of the overlap 1 when moving upwards after distribution by overpressure of the profile pipes of the overlap 1.

The device operates as follows.

Before the descent into the well (not shown in FIG.), A shoe with a check valve and a fishing head is installed on the lower profile pipe of the overlap 1, and in the upper cylindrical part 12 of the overlap 1 through a special mandrel 18 and a longitudinally corrugated pipe 16 (Fig. 3) a hollow rod 10 (Fig. 1), onto which the bottom expander 21 with cuffs 5, 6, the retaining ring 24 and the bottom expander 8 of the inner mandrel 9 with the catch 13 of the shoe are successively mounted from below. After that, the cylindrical part 12 with the longitudinally corrugated pipe 16 (Fig. 3) of the overlap 1 (Fig. 1) is connected (for example, by welding) to the upper profile pipe of the overlap 1. Above the special mandrel 18 is installed (for example, using a threaded connection 28) section 3 of the expansion head 2 and the node connection with the pipe string.

Then the shutoff 1 is lowered into the well, sequentially connecting the profile pipes with the help of threads. Moreover, the inner protrusion 11 (Fig. 2) of the locking mechanism 4, made in the upper cylindrical part 12 of the overlap 1 (Fig. 1), due to interaction with the outer groove 7 (Fig. 2), made on the outer surface of the lower expander 8 of the inner mandrel 9 (Fig. 1), reliably and tightly (thanks to seals 5 and 6) fixes the shutoff 1 on the pipe string. When this downhole fluid fills the internal cavity of the overlap 1 through the check valve shoe.

After the shutter 1 is lowered into the interval of isolation of the complication zone in the pipe string with the help of a mud pump, excessive hydraulic pressure is created, which is transmitted through the central channels of the expansion head 2 and the hollow cylindrical rod 10 to the inner cavity of the shutter 1 and straightens the profile shutter pipes by closing the check valve of the shoe. 1 until they are pressed firmly against the walls of the well, fixing the overlap 1 relative to the well.

In this case, the upper expander 21 of the inner mandrel 9 under the action of excessive hydraulic pressure inside the overlap 1 and due to the cuffs 5, 6 begins to move upward along the hollow cylindrical rod 10, distributing in the radial direction with the help of the cone 27 the upper longitudinally corrugated pipe 16 (Fig. 3) and moving simultaneously (upon reaching the end face 19 (Fig. 1) of the special mandrel 18) the special mandrel 18 up.

Upon reaching the stop 23 of the cylindrical rod 10 with a special mandrel 18, the upper expander 21 of the inner mandrel 9 stops the distribution of the corrugated pipe 16 (Fig. 3) and stops, while the retaining ring 24 (Fig. 1) of the upper expander 21 enters the radial grooves 25 of the rod 10, fixing the upper expander 21 and the special mandrel 18 on the rod 10 from the shift down. At the same time, the lateral through channel 26 of the upper expander 21 is aligned with the lateral hole 22 of the cylindrical rod 10. The hydraulic pressure inside the shutoff 1 drops and is compared with the downhole pressure, which is recorded on the wellhead pressure gauge (not shown in Fig.). The processes of fixing the overlap 1 in the well by hydraulic pressure and the formation of the upper bell at the entrance to the overlap 1 are completed.

Then, by creating a load on the pipe string (with insufficient weight of the pipe string, a borehole hydraulic jack is used (not shown in FIG.)), They begin to sequentially profile the overlap pipes 1 with the mandrels 9, 18 and the expanding head 2 until they are pressed more firmly against the well walls while the special mandrel 18 (using the conical surface 20) and the section 3 of the expanding head 2 easily (due to preliminary distribution from the inside by the upper expander 21 of the inner mandrel 9) pass the upper profile pipe 16 (Fig. 3), straightening its beams 17 to form a circle, forming a funnel desired size inlet Perekryvatel 1 (FIG. 1).

When the catcher 13 reaches the expanding head 2 of the overlap shoe 1, the fishing head of the shoe enters the socket 14 of the catcher 13 and, thanks to the locking rings 15 of the catcher 13, which mesh with the ring grooves of the fishing head of the shoe, is securely fixed in it.

After complete distribution of the profile pipes of the overlap 1, the arrangement consisting of a shoe, a trap 13, a rod 10 with mandrels 9, 18, and sections 3 of the expanding head 2 on the pipe string are removed from the well.

The proposed device has great reliability and a wider range of technological capabilities due to preliminary distribution of the upper profile end of the overlapper, using hydraulic pressure on the mandrel from the inside towards the unfinished end of the overlap, which significantly reduces the distribution force and reduces subsequent loads on the mandrel tool when passing the upper end of the overlap and its final distribution to the required size, in addition, due to the combination of radial holes movably of the inner mandrel and the hollow rod at the end of the preliminary dispensing Perekryvatel upper end, the pressure reduction within the pipe string, which serves as a signal for setting the hydraulic pressure Perekryvatel completion.

Claims (1)

A device for launching and installing a profile shutter in a well, including a profile shutter with cylindrical sections and threaded connections, mounted on the lower end of the shutter shoe with a check valve and a fishing head at the top, an expanding head consisting of several sections mounted on top of each other with decreasing diameter working surfaces in the direction of the overlap, and containing on top the connection node with the pipe string, and below - the locking mechanism, hermetically connected to the upper the end of the overlap, with a catcher below the catch head of the shoe, 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 whose end face of the conical surface is made to interact with the inner a mandrel installed in the cylindrical part of the ceiling, characterized in that the conical surface of the special mandrel is smooth, the inner mandrel is prefabricated, consisting from the upper and lower expanders, and the expanding head is equipped with a hollow cylindrical rod with a side hole connected below to the lower expander, and above equipped with a stop, while the special mandrel and upper expander are mounted on the cylindrical rod with the possibility of limited upward movement to the stop under the action of excess pressure inside the shutter, and the upper reamer is hermetically installed in the cylindrical part of the shutoff, equipped with a locking mechanism that fixes it on the cylindrical current from the shift down, and the lateral through bore adapted to communicate with a lateral opening of the cylindrical rod at the upper limit position, the upper spreader top equipped with a conical surface with an apex angle allowing to produce expansion of the upper end Perekryvatel after dispensing pressurized shaped tubes Perekryvatel.

Images