RU2378487C2 - Device for delivering tools to horizontal well - Google Patents

Abstract

FIELD: oil and gas production.

SUBSTANCE: device includes external fixed housing in which there installed is electric motor with reducing reduction gear, screw gear, upper and lower movable housings with pinion racks, in each of which there installed is a pair of spring-loaded wedging cams; at that, the other pair is turned through 90° relative to longitudinal axis of the device; folding mechanism of lower pair of cams by means of rack, axis with gear quadrant, which is fixed on movable insert; in lower movable housing there made is cam slot, low pair of cams is fixed on the axis in movable insert.

EFFECT: improving reliability, increasing pulling force, increasing movement speed.

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Description

The invention relates to the drilling of horizontal and highly deviated oil and gas wells, in particular to devices for delivering devices to the well.

A device is known for delivering geophysical instruments to a horizontal well containing a load secured to the logging cable above the descent tool and made in the form of sealed elements of a flexible hose filled with a weighted fluid and hydraulically interconnected. When the entire flexible hose is lowered into the well, an excessive hydraulic pressure is created in the hose under the action of a liquid column, which inflates the hose, as a result of which it becomes stiff. Under the influence of weight and due to stiffness, the hose with the cable moves along the horizontal part of the well, moving the device. (A.S. SU No. 1739018, Е21В 47/00, published in 1992, BI No. 21).

A disadvantage of the known device is that the types of wells on which this method is applicable are limited, because due to the large length of the load being hung and insufficient cable stiffness it is used only in plugged open wells (reservoir pressure is balanced by a liquid column) and in wells having a small the length of the inclined horizontal section (not more than 250-300 m), as well as insufficient productivity.

The closest in technical essence and the achieved result is a device for transporting devices in the well, containing a cylindrical body, two wedging supports and a mover with a cable made in the form of two pistons with rods, the second wedging support mounted on the rod of the second piston. The device is moved by alternately extending the pistons and securing the corresponding support to the wall of the well (A.c. SU No. 1654558, Е21В 47/00, published in 1991, BI No. 21).

The disadvantage of this device is the low productivity due to the idling, a small linear movement of the device, limited by the length of the piston and the long cycle time of the operation.

The objective of the present invention is to increase reliability, increase pulling force, as well as increase speed.

The essence of the present invention lies in the fact that in the device for delivering devices to a horizontal well containing an external fixed body, proppants and propulsor, according to the invention, an electric motor with a reduction gear, a helical gear, upper and lower movable bodies with gear racks are installed in the external fixed body , in each of which a pair of spring-loaded proppant cams is installed, the second pair being deployed 90 ° relative to the longitudinal axis of the device, dyvaniya lower pair of cams via the rack axis with a toothed sector fixed on the movable insert in the lower mobile body shaped groove is formed, the lower pair of cams fixed to the axis in the movable insert, proppants supports are made in the form of spring-loaded wedging cams.

Figure 1 shows a diagram of the proposed device.

Figure 2 shows a curly groove with an axis 13 fixed in it.

The device comprises an external fixed housing 1 with an electric motor 2 installed in it and a reduction gear 3, the upper 8 and lower 6 movable bodies, each of which has a pair of proppant cams 4 with springs 5, a lower centralizer 7, an upper centralizer 9 and a mechanical transmission screw - nut 10, 11.

The movable housing 6 has a liner 12, in which the lower pair of cams 4 is fixed on the axis, provided with an axis with a gear sector 13.

The housings 6 and 8 are equipped with gear racks 16, 17, the housing 1 - spur gear 14.

The outer casing 1 and the movable casing 6 have transverse rollers 15.

The delivery of devices to a horizontal well using the proposed device is as follows.

The proposed device is connected to the coupling With a descent device and a wireline cable (not shown), on which it is lowered into the well through a lubricator mounted on the wellhead (not shown).

When the device enters the horizontal section of the well, power is supplied to the engine 2.

When the lead screw 10 rotates, the lead nut 11 moves upward in section B, the cams 4 exit from the transverse roller 15 of the outer casing 1 and wedge in the casing under the action of the springs 5.

When the driving nut 11 moves upward in section B, the bodies 6 and 8 move in different directions with the help of gear racks 16 and the wheel 14, the axis 13 is rotated by a gear rack 17 90 ° and the axis 13 is engaged with the movable housing 6, in which figured groove G (figure 2), and on the axis 13 there are flats B. Thus, the insert 12 is rigidly fixed in the housing 6. Cams 4 come out from under the transverse roller 15 of the housing 6, together with the housing 6 move down, while like another pair of cams wedged on a casing.

Then, with the reciprocating movement of the nut 11 in section A, the device, together with the descent device, is alternately pulled to one of the movable bodies 6 or 8, rigidly fixed on the casing (through a pair of cams 4), forcing the device forward.

By making a reciprocating movement within the area A, the helical gear provides the forward movement of the device. Moreover, thanks to the gear wheel 14 and the gear racks, idling for one pair of cams is a working stroke for the other pair, providing continuous movement of the device in the casing.

Lifting the device for secondary research or extracting it from the well is carried out by winding the cable onto the logging winch drum.

Before lifting the device, a control command is given to pass the nut B in the running nut, while the rib rail 17 rotates the axis 13 90 °, the movable insert 12 is unlocked, which, together with the housing 8, goes down, the cams 4 go under the transverse rollers 15. The device is shown in transport situation.

Using the proposed device provides a multiple process of lowering / raising the device, allows you to deliver the devices to any horizontal well, while providing greater gain due to the rigid coupling with the column, reliability and increased speed.

Claims (1)

A device for delivering devices to a horizontal well containing an external stationary housing, proppants and a propulsion device, characterized in that an external motor with a reduction gear, a helical gear, upper and lower movable bodies with gear racks, each of which has a pair spring-loaded proppant cams, the second pair deployed 90 ° relative to the longitudinal axis of the device, the folding mechanism of the lower pair of cams using a rail, the axis of the cog In the lower sector, mounted in a movable insert, a figured groove is made in the lower movable housing, the lower pair of cams is fixed on an axis in the movable insert, the proppant supports are made in the form of spring-loaded proppant cams.

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