RU2318112C1 - Downhole hydraulic deflecting unit - Google Patents

Abstract

FIELD: oil production, particularly device to be inserted in multilateral well offshoot.

SUBSTANCE: unit comprises body 1 with central through channel 2, spherical recess 3 formed in lower body part and inner groove 4 located in central part thereof. Spring-loaded piston 6 with rod 7 having central through channel 8 is air-tightly inserted in inner groove. Unit also has deflecting head 9 with semi-sphere 10 in upper part thereof. The head 9 rotatingly and slidably cooperates with lower part of spherical recess 3. Deflecting head 9 is spring-loaded from body 1. Eccentric hollow thrust 12 is installed in body between deflecting head 9 and rod 7 so that thrust cooperates with lower rod end from upper part thereof. Eccentric hollow thrust 12 is provided with semi-sphere 13 arranged from lower part thereof. Segment 14 is created from lower end of the thrust 12. Semi-sphere 13 cooperates with upper part of spherical body recess 3. Segment 14 cooperates with upper plane of semi-sphere 10 so as rod and piston move downwards head 9 may be deflected in direction opposite to segment.

EFFECT: provision of precise deflecting head rotation through predetermined angle, increased simplicity of unit insertion in well offshoot and elimination of repeated works, simplified structure, decreased costs and possibility of unit operation in horizontal directional and horizontal wells.

2 dwg

Description

The invention relates to the oil industry, in particular to devices for entering the sidetracks of a multilateral well.

It is known "Device for delivering an object to the lateral barrel of a multilateral well" (patent RU No. 2142559, ЕВВ 47/01, publ. Bull. No. 33 of 11/24/1997) with a rotation mechanism and a mechanism for changing the direction of movement located below, made in the form a guide pipe interacting with an elastic element mounted on the device body, while the guide pipe with its upper end is pivotally connected to the object, and the lower end is connected to the disconnect lock, in addition, a spring-loaded slider is installed in it, the end surface of which forms a hnyuyu inclined surface.

The disadvantages of this device are a large number of small, difficult to manufacture mating parts and, as a result, the high cost and low reliability of the whole product as a whole, the ability to rotate the device only from the wellhead, which reduces the accuracy of rotation by a certain angle due to the twisting of the pipe string on which the device comes down.

The closest in technical essence and the achieved result is the "Hydraulic Curve Sub" (see page 159, Catalog "Baker Oil Tools", Product Services Version 5.0, "Fishing Services", 163 pages), consisting of a housing with a pin, a central a passage channel, a lower spherical sampling and an internal groove in the middle part, into which an axially spring-loaded piston with a longitudinal technological groove on the outer surface and with a rod equipped with a central passage channel and a lower oblique cut is inserted with axial movement downward, and about sloping head with a hemisphere on top, sealingly cooperating pivotable and deviations from a spherical sample body, the upper plane of the hemisphere of the deflecting head is adapted to cooperate with an oblique cut of the piston rod as it moves downward, and the housing pin is arranged to engage with the process bore of the piston.

The disadvantages of this device are:

- lack of fixation of the deflecting head during descent, which can cause unauthorized deviation of it down, which excludes its performance in horizontally-deviated and horizontal wells;

- the ability to rotate the device only from the wellhead, which reduces the accuracy of rotation by a certain angle due to the twisting of the pipe string on which the device descends.

The technical task of the invention is to simplify the design of the hydraulic borehole deflecting unit and reduce the cost of the device, expanding its functionality by working in horizontally-inclined and horizontal wells, as well as ensuring accurate rotation of the deflecting head itself at a given angle.

The technical problem is solved by a hydraulic borehole deflecting unit, comprising a housing with a central passage channel, a spherical sampling from below and an internal groove in the middle part, into which a piston with a rod spring-loaded upward, equipped with a central passage channel, and a deflecting head with a hemisphere above tightly interacting with the possibility of rotation and deviation with the lower part of the spherical sample of the housing.

What is new is that the deflecting head is spring-loaded from the body, while an eccentric hollow stop is installed between the deflecting head and the stem in the housing, interacting from above with the lower end of the stem, and the eccentric hollow stop is equipped with a hemisphere and a segment from the bottom from the bottom, and the hemisphere is eccentric the hollow stop interacts with the upper part of the spherical body sample, and the segment interacts with the upper plane of the hemisphere of the deflecting head with the possibility of its deflection in the opposite direction the positive side of the segment when moving the piston rod down.

Figure 1 shows a deflecting unit in longitudinal section.

Figure 2 shows a section of an eccentric hollow stop.

The hydraulic downhole deflector assembly includes a housing 1 (see FIG. 1) with a central passage 2, a spherical sampling 3 from the bottom and an inner groove 4 in the middle part.

In the inner groove 4 of the housing 1 is inserted with the possibility of axial movement downwardly spring-loaded by means of a spring 5 upward a piston 6 with a rod 7 equipped with a central passage channel 8.

Also, the hydraulic downhole deflecting unit includes a deflecting head 9 with a hemisphere 10 at the top, interacting with the possibility of rotation and deflection with the lower part of the spherical sample 3 of the housing 1.

The deflecting head 9 is spring-loaded by means of a spring 11 from the housing 1. In the housing 1, between the deflecting head 9 and the stem 7, an eccentric hollow stop 12 is installed, interacting from above with the lower end of the stem 7.

The eccentric hollow stop 12 is equipped with a hemisphere 13 and a segment 14 from the lower end from the bottom from the outside (see Figs. 1 and 2).

The hemisphere 13 of the eccentric hollow stop 12 interacts with the upper part of the spherical sample 3 of the housing 1.

The segment 14 of the eccentric hollow stop 12 interacts with the upper plane of the hemisphere 10 of the deflecting head 9 with the possibility of rotation of the latter when moving the rod 7 with the piston 6 down.

In order to eliminate "pistoning" during operation of the device, a technological hole 15 is made at the lower end of the inner groove 4 of the housing 1.

Below the deflecting head 9 is equipped with a nozzle 16 with holes 17.

Unauthorized fluid flows during the operation of the device are excluded by the sealing elements 18, 19, 20.

Hydraulic downhole deflecting unit operates as follows.

Before the descent of the hydraulic borehole deflecting unit into the well, it is assembled, while the segment 14 of the eccentric hollow stop 12 is positioned relative to the axis from the opposite side to the side wellbore, into which it is necessary to enter.

The hydraulic downhole deflector assembly (see FIG. 1) is connected from above by a connecting thread 21 to a flexible pipe (not shown in FIGS. 1 and 2) and lowered into a multilateral well.

In the interval of the alleged location of the lateral bore of the multilateral well in the flexible pipe and, accordingly, inside the hydraulic borehole deflecting unit, hydraulic pressure is created, which increases due to the high flow rate of the liquid due to the hydraulic resistance of the piston 6, as well as the small cross-sectional area of the holes 17 of the nozzle 16.

As a result of this, the piston 6 with the rod 7, compressing the spring 5, moves downward, while the lower end of the rod 7 interacts with the upper end of the eccentric hollow stop 12, which in turn is segment 14 (see figure 2), made at its lower end interacts with the upper plane of the hemisphere 10 (see figure 1) of the deflecting head 9, while the hemisphere 13 of the eccentric hollow stop 12 interacts with the upper part of the spherical sample 3 of the housing 1. As a result, the deflecting head 9 is a hemisphere 10, hermetically interacting with the possibility of rotation and in that the deviation of the spherical sample 3 of the body 1, compressing the spring 11, rotates in the opposite direction from the segment 14 and enters the sidetrack multilateral well, fixing the device in the lateral wellbore multilateral well. The descent of the flexible pipe into the multilateral well is continued with the simultaneous supply of fluid into the flexible pipe, while the hydraulic downhole deflecting unit moves in the lateral shaft, and the fluid from the flexible pipe through the central passage 8 of the rod 7 and the central passage 3 of the housing 1 through the central channel 22 of the deflector the heads 9 and the openings 17 of the nozzle 16 fall into the side shaft, washing it.

Having reached the bottom of the side table of a multilateral well, the descent of the flexible pipe is stopped, without relieving pressure, the bottom hole zone (SCR) of the side trunk of the multilateral well is treated with chemical reagents, and the nozzle 16, rigidly fixed at the lower end of the deflecting head 9, directs a stream of fluid into the side trunk through the holes 17 multilateral wells.

At the end of barrel processing, the pressure in the flexible pipe and, accordingly, in the device is relieved. As a result, the piston 6 with the rod 7 is moved back due to the return force of the spring 5 and the eccentric hollow stop 12 takes its initial position (see figure 1). In addition, the deflecting head 9 is aligned coaxially with the housing 1 due to the return force of the spring 11, which is expanded.

After that, the hydraulic borehole deflecting unit with a flexible pipe is first removed from the sidetrack of a multilateral well, and then completely raised to the surface. If it is necessary to process another side trunk of a multilateral well, a hydraulic borehole deflecting unit with a flexible pipe is removed only from the previous side trunk of the multilateral well and the operations described above are repeated.

The proposed hydraulic downhole deflecting unit has a simple design, low cost, and the expansion of its functionality is associated with the possibility of its operation in horizontal-deviated and horizontal wells. In addition, it provides an accurate rotation directly of the deflecting head itself at a predetermined angle, which greatly facilitates getting into the lateral barrel of a multilateral well and avoids repeated work.

Claims (1)

A hydraulic borehole deflecting unit including a housing with a central passage channel, a spherical selection from below and an internal groove in the middle part into which a piston with a spring, spring-loaded upward, with a central passage channel, a deflecting head with a hemisphere at the top, hermetically interacting, is tightly inserted with axial movement down with the possibility of rotation and deviation with the lower part of the spherical sample of the housing, characterized in that the deflecting head is spring-loaded from case, while in the case between the deflecting head and the rod an eccentric hollow stop is installed, interacting from above with the lower end of the rod, and the eccentric hollow stop is equipped with a hemisphere and a segment from the bottom end from the bottom, and the hemisphere of the eccentric hollow stop interacts with the upper part of the spherical body sample, and the segment interacts with the upper plane of the hemisphere of the deflecting head with the possibility of its deflection in the opposite direction from the segment when moving the rod with the piston down.

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