RU33968U1 - DEVICE FOR DRILLING TILT-HORIZONTAL WELLS WITH ROTOR METHOD - Google Patents

Description

DEVICE FOR DRILLING TILT-HORIZONTAL WELLS

ROTARY DRIVER

The utility model relates to well drilling devices and is designed for rotary drilling of directional horizontal multilateral wells to productive horizons of multilayer deposits of solid minerals, followed by the extraction of solid minerals from thin substandard formations using the well technology.

A device for drilling horizontal wells, comprising a tubular body, a deflecting element located in its cavity, a hollow shaft located in the body with the ability to interact with the deflecting element, the upper end of the shaft is rigidly connected to the housing, and the lower is mounted on a hinged support (SU, ed. St. N1469075, E21B7 / 08.21.04.87).

This device has limited operational capabilities, because, firstly, it does not allow changing the direction of the well in the azimuthal direction, and secondly, the specified direction is maintained only when drilling with constant axial load.

A device for drilling inclined horizontal wells is known, having in the case with surfaces centering relative to the axis of the wells a hollow shaft consisting of upper and lower sections, a shaft change unit with the possibility of axial movement and a spring-loaded coupling with an axial channel relative to the lower section of the shaft (see US patent N4895214, E21B7 / 08.90.01.23).

The device has limited operational capabilities due to the design features of the control unit for the direction of drilling, which does not have a reliable fixation of the body and, therefore, does not guarantee a given direction of the well. In addition, this device requires two modes of pumping the drilling fluid, working and control, to translate it into working position, which in turn causes an increase in energy costs.

Closest to the claimed device is a device for directional drilling, comprising a hollow shaft, a housing mounted concentrically rotatably on the shaft, support elements mounted on the outer surface of the housing, and a housing control assembly. The shaft is made up of a composite of the upper and lower sections, located at an angle relative to one another, and the housing control unit contains a coupling located between the shaft sections and spring-loaded relative to the lower section, which is mounted with the possibility of axial movement and has

g o o 3 1 2 4

MPKE21V7 / 08

the outer surface of the annular groove with a groove for interaction with the locking finger attached to the housing (see RF patent No. 2112128, IPC E21B7 / 08).

The disadvantage of this device is the inability to drill in a short arc from an inclined section of the well into a horizontal section of the reservoir. In addition, the presence of an external rigid body bent at an angle a leads to a decrease in the strength characteristics of the device nodes when drilling small d:. Meters.

The objective of the proposed device is the implementation of drilling in a short arc from an inclined section of the well into a horizontal section of the reservoir.

The problem is solved in that in the device for drilling deviated horizontal wells by the rotary method, comprising hollow cylindrical upper and lower bodies located between the drill pipes and the podrodrushy element, a node for changing the drilling angle installed between the bodies, according to the proposed solution, the node for changing the angle of drilling is completed in in the form of a sleeve movably connected to the cases, inside of which there is a rubber sleeve passing through the internal cavities of the cases, the rubber sleeve is provided with a pack otnitelnym element and to avoid its deformation, wherein the housing is located with a gap relative to each other to generate the appropriate angle for drilling the calculated trajectory.

Elements for eliminating deformation of the rubber sleeve are made in the form of a set of steel rings, fasteners are made in the form of two pairs of coaxially arranged stoppers in the lower and upper cases, respectively, at an angle of 90 to each other.

The originality of the proposed solution lies in the fact that the device eliminates the need for an external rigid body, bent at an angle a, which allows us to prevent the weakening of the strength characteristics of the nodes of the device when drilling wells of small diameter.

The utility model is illustrated in the drawing, where:

1 - upper case;

2 lower case;

3- sleeve;

4-stopper;

5-rubber sleeve;

9-deviated well section;

10-set of steel rings;

11-face;

12-gland.

A device for drilling inclined horizontal wells by the rotary method consists of two detachable movable bodies - the upper 1, which is connected to the drill pipes 8 and the lower 2, which is connected to the bit 7. The upper body 1 and the lower body 2 are interconnected by a movable sleeve 3, through four stoppers 4., two of which are coaxially located in the upper case and two in the lower case. The planes of these pairs of stoppers are located in relation to each other at an angle of 90 degrees. In the body of housings 1 and 2, the stoppers 4 are fixedly mounted, and the movable sleeve 3 can oscillate around the stoppers 4. The stopper 4 and the movable sleeve 3 are connected through the bodies to the drill pipes 8 and the bit 7. The cases are located with a gap (c) relative to each other , which allows you to create the appropriate angle of inclination a for drilling along the calculated trajectory, to smooth the inclined section of the well into horizontal in a specific geological section. To calculate the size of the gap, the following ratio Sin a / 2 can be used, edeD is the diameter of the body, “is the maximum) thickness between the bodies at the moment of contact of the end parts, which is equal to the central angle of the regular polygon described by a circle of radius R along which trajectory flattenes. At the same time (f: n, where n is the number of sides of the correctly described polygon and is equal to the sum of the lengths of the lower part of the body and the rock cutting tool (bit). The selected calculated angle value is provided by focusing from one of the sides of the end parts of the bodies.

A device for drilling inclined horizontal squins rotary method works as follows. The movable sleeve 3 makes free oscillatory movements around the stoppers 4 within the boundaries of the inner cavity of the upper 1 and lower 2 of the housing. Through the stopper 4 and the movable sleeve 3, rotation is transmitted from the rotor through the drill pipe B to the bit 7 at a design angle a. To carry out the supply of flushing fluid through the drill pipes 8 to the bit 7 and then to clean the bottom, a rubber sleeve 5 is inserted into the upper body 1, lower body 2, movable sleeve 3, equipped with a sealing gland 12, a set of steel rings 10 that do not allow deformation of the rubber bushings 5. The fixation of the calculated value of the deflection angle a occurs due to the end stops 6 of the upper 1 and lower 2 of the housing. In the process of lowering the device on the drill pipe 8 along the wall of the inclined

section of the well 9, the device approaches the bottom 11 at an angle a. In the process of drilling along a short arc, in order to exit from the inclined section to the productive horizon, the inclined section is shaded to the horizon by the corresponding calculated angle a. The azimuth is set by the inclined section and it is preserved at the entrance to the horizon of the reservoir.

Example.

With the actual geological occurrence of the reservoir (the depth of which is determined by preliminary drilling of the leading well) at 40 - 50 m, the radius of the calculated trajectory is about 20 m. The diameter of the body is 0.165 m, the length of the lower part of the body with a chisel is 0.7 m, while it is 180, and the angle a 2, so the gap in the static state between the cases will be 2.8 mm, and with the maximum opening of the cases to the stop - 5.6 mm.

Claims (2)

1. A device for drilling inclined horizontal wells by the rotary method, comprising hollow cylindrical upper and lower bodies located between the drill pipes and the rock cutting element, a drilling angle changing unit installed between the bodies, characterized in that the drilling angle changing unit is made in the form of a sleeve, movably connected to the housings, inside of which there is a rubber sleeve passing through the internal cavities of the bodies, the rubber sleeve is provided with a sealing element and elements for exceptionally Ia deformation, wherein the housing is located with a gap relative to each other to generate the appropriate angle for drilling the calculated trajectory. 2. The device according to claim 1, characterized in that the elements for eliminating the deformation of the rubber sleeve are made in the form of a set of steel rings, the fasteners are made in the form of two pairs of coaxially arranged stoppers in the lower and upper cases, respectively, at an angle of 90 ° to each other.