RU2426876C1 - Procedure for orientation of mechanism in well and device for its implementation - Google Patents

Abstract

FIELD: oil and gas production.

SUBSTANCE: procedure for orientation of mechanism in well consists in pumping down liquid through device and in its rotation around lengthwise axis. Also, a case of the device has an eccentric orifice on lower surface in a cavity of which there is positioned a lock element freely travelling under influence of gravity. When the lock element shuts off the eccentric orifice, pressure of liquid in the cavity of the device increases. Orientation of the mechanism is determined on base of record of pressure build-up.

EFFECT: simplified design of device for orientation of well mechanisms; reduced cost of operations, reduced time for mechanism installation.

4 cl, 3 dwg

Description

The invention relates to the oil and gas industry and, more specifically, relates to a method and device for orienting downhole mechanisms, for example, a wedge for cutting an additional trunk in directional and horizontal wells.

Known methods for installing mechanisms at a given angle using measuring devices, for example, installing a whipstock in a well using gyroscopes, inclinometers or telemetry systems. Their disadvantage is the need for measurements to determine the installation position of the deflector wedge.

A known method of creating a diverter, including installing a wedge in the interval of cutting the second barrel, the wedge is formed by injection of cementitious material, followed by the descent of the formwork in the form of a return wedge of easily destructive material (patent RU 2147063). The disadvantage is the technological complexity of the wedge installation process, as well as the inability to remove it for access to the main trunk.

Known diverter-orientator (according to patent RU 2167257), comprising a housing with a wedge surface in the form of a chute and a latch for attaching and installing the diverter at the desired elevation of the wellbore, characterized in that the diverter is eccentric with a center of gravity. The disadvantage is the complex design changes the center of gravity of the layout.

A known method and device for orienting a wedge-diverter according to patent US 6968903 (selected as prototypes of the method and device). The device includes a shaft with a displaced center of gravity. The method consists in orienting the wedge under the action of gravity during rotation of the entire drill string through the swivel. The disadvantage of this device is its complex design and a large number of parts.

An object of the invention is to simplify the orientation of downhole mechanisms. At the same time, a reduction in the cost of work (reduction in installation time) for installing mechanisms, for example, a deflector wedge, is achieved by reducing tripping operations.

The technical result is achieved in a method for orienting a mechanism in a well, in which a fluid is pumped through a device including a body with an eccentric hole on the bottom surface, in the cavity of which a shut-off element is placed, and the body is rotated around a longitudinal axis. The pressure growth determines the orientation of the mechanism.

The technical result is achieved in a device for orienting the mechanism in the well, comprising a housing with an eccentric hole and a locking element in a cylindrical cavity of the housing, which are configured to overlap the locking element of the eccentric hole when the housing rotates around a longitudinal axis. The housing is equipped with a limiter. The eccentric hole is made on the lower base of the cavity, the locking element is made in the form of a cylinder, freely placed in the cavity.

The device is illustrated by drawings:

figure 1 - device for orientation;

figure 2 - device for orientation;

figure 3 - device for orientation as part of the layout of the bottom of the drill string.

A device for orienting the mechanism in the well (FIGS. 1, 2, hereinafter the device) includes a housing 1 with an eccentric hole 2 on the lower base of the cavity 4, for example, on the flat end 3 of the cylindrical cavity 4. A cylindrical locking element 5 (cylinder 5) with flat end surfaces When the housing 1 is rotated around the longitudinal axis, the locking element 5, rolling, can block an eccentric hole 2 with its end surface.

The housing 1 can be equipped with a limiter 6 with holes for the passage of fluid. In addition, the housing can be performed without a limiter, while the function of the limiter can perform other parts of the mechanism 7 (figure 3). Figure 3 shows an embodiment of the lower part of the mechanism 7 - the layout of the bottom of the drill string, namely (bottom to top): the claimed device assembly, sleeve, hydraulic armature, landing sleeve for installation and orientation of the deflector (not shown).

The method of orientation of the mechanism in the well is implemented as follows. The device is screwed into the layout (figure 3) and lowered into the well to the depth of the wedge-deflector. They begin to pump liquid with low intensity through the layout and simultaneously rotate it with a rotor around the longitudinal axis.

In an inclined or horizontal well, due to gravity and circulation of the drilling fluid in the cavity 4 of the housing 1, the free shutoff member 5, rolling, closes the eccentric hole 2. The pressure change is determined by the pressure gauge, which indicates that the shutoff member 5 in the housing 1 blocked the eccentric hole 2 in whole or in part. If, when the fluid circulation in the column is stopped, the pressure will not decrease, the position of the entire arrangement in a vertical plane is determined, for example, for the orientation of the diverter wedge. The angle error is determined by the ratio of the dimensions of the eccentric hole 2 and the locking cylinder 5.

In the case of vertical wells or close to vertical ones, in which the locking cylinder 5 will not roll through the internal cavity 4 due to gravity, the cylindrical locking body can be fixed in a certain position using a mechanism containing a gyroscope, which will replace the action of gravity.

Thus, the orientation of the mechanisms in the well becomes possible without the descent of measuring instruments, such as inclinometers or telemetry systems; the layout is greatly simplified and metal consumption is reduced, since the layout will consist of: a device for orientation; profile pipe; whipstock.

Claims (4)

1. A method for orienting a mechanism in a well, in which a fluid is pumped and rotated around a longitudinal axis through a device including a body with an eccentric hole in the cavity of which a shut-off element is placed, and the orientation of the mechanism is determined by the pressure increase. 2. A device for orienting the mechanism in the well, comprising a housing with an eccentric hole and a locking element in the cavity of the housing, which are configured to block the locking element of the eccentric hole when the housing rotates around a longitudinal axis. 3. The device according to claim 2, characterized in that the housing is equipped with a limiter. 4. The device according to claim 2, characterized in that the housing has a cylindrical cavity with an eccentric hole, the locking element is made in the form of a cylinder freely moving in the cavity.

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