RU2345210C2 - Carrier for hardware transporting to horizontal well - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention refers to horizontal and high-inclined oil and gas wells surveying, specifically to carriers for hardware transportation to the well. Carrier contains electric motor driven, geared-down cylindrical body, wedge bearings and propeller in the form of wheels with rounded radius equal to surveyed well radius mounted spin on spindles of wedge bearings. Besides carrier is supplied with centraliser wheels mounted on lever shaft pivotally connected to the body and spring-loaded centraliser plunger furnished with stop block interworking with propeller plunger. Wedge bearings are overall length offset, fitted with spur gear sectors and pivotally connected by levers with spring-loaded propeller plunger. Herewith each wheel is connected to down gear through worm gear one shaft of which is supplied with lead screw and sliding nut groove of which enters stopper boss mounted in the body.

EFFECT: higher performance reliability.

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Description

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

A device for delivering devices to a horizontal well is known, comprising a cylindrical body with an electric motor installed therein with a reduction gear and a drive shaft with a worm gear for each wheel, a mover made in the form of wheels with a radius of curvature equal to the radius of the well under study and wedging supports, pivotally connected by levers with spherical nuts mounted on spindles with the possibility of rapprochement. (1) (RF Patent No. 2236549, cl. ЕВВ 23/14, publ. 2004).

A disadvantage of the known device is the low reliability due to the movement of the body along the wall of the horizontal section of the well, which leads to its stop in the presence of a hard formation on it.

The closest in technical essence and the achieved result is a device for delivering devices to a horizontal well, containing a cylindrical body, wedging supports and a mover made in the form of wheels mounted on shafts of wedging supports through overrunning clutches, and the outer surface of the wheel has a radius of curvature equal to the radius the investigated well, and the proppants are equipped with springs. An electric motor with a reduction gear, bevel and chain gears is installed in the housing. (2) (RF Patent No. 2150569, cl. ЕВВ 23/14, publ. 2000).

A disadvantage of the known device is the low reliability of the device due to low traction due to the weak attraction by the springs of the wheels of the propulsion device to the walls of the well and the difficulty of passage of the joints of the casing collars due to the small size of the wheel falling into the groove of the joint of the couplings.

The objective of the present invention is to increase the reliability of the device.

The essence of the present invention lies in the fact that the known device for delivering devices to a horizontal well, comprising a cylindrical body with an electric motor and a reduction gear, wedging supports and a thruster made in the form of wheels with a radius of curvature equal to the radius of the well under investigation installed on the shafts of wedging supports, according to the invention is additionally equipped with centralizer wheels mounted on the shafts of levers pivotally connected to the housing and a spring-loaded centralizer plunger, equipped with a stop that interacts with the propulsion plunger, while the wedging supports are mounted with an offset along the length of the housing, equipped with sectors of cylindrical gears and pivotally connected by levers with a spring-loaded plunger of the propulsion, and each wheel is connected to a reduction gear by a worm gear, one of the shafts of which is equipped with a lead screw and a running nut, the groove of which is included in the protrusion of the stopper installed in the housing.

The drawing shows a diagram of the proposed device.

The device comprises a cylindrical housing 1 with an electric motor 2 and a reduction gear 3 installed in it, two articulated wedging supports 4, 5, mounted with an offset A along the length of the housing and equipped with sectors of cylindrical gears 6, 7. Wheels 8, 9 of the wedging support are fitted with wheels 10, 11 propulsors, the rotation of which is carried out by a worm gear 12, 13 to each wheel from a reduction gear. One of the shafts of the worm gear is equipped with a lead screw 14 with a lead nut 15, and a stopper 16 is installed in the housing, which interacts with the groove of the lead nut 15.

The proppants 4, 5 are pivotally connected by levers 17, 18 with a spring-loaded plunger 19 of the propulsion device. The device is equipped with centralizer wheels 20, 21 mounted on the shafts of levers 22, 23 pivotally connected to the housing 1 and levers 24, 25 pivotally connected to a spring-loaded centralizer plunger 26, which has a stop 27 interacting with the propulsion plunger 19.

The device operates as follows.

The device is connected with a cable lug B with a descent device and a wireline cable (not shown), on which it is lowered into the well. When the device exits into the inclined section of the well, a control voltage is supplied to the engine 2, the rotation of which through the reduction gear 3 and worm gears 12, 13 is transmitted to the wheels 10, 11 of the propulsion device. When the lead screw 14 rotates, the groove of the lead nut 15 disengages from the stopper 16, releasing the proppants 4, 5, which open under the pressure of the spring-loaded plunger 19 of the propulsion and articulated levers 17, 18 to the stop of the wheels 10, 11 of the propulsion against the wall of the investigated well. When moving the spring-loaded plunger 19 of the propulsion device, the stop 27 interacting with it releases the centralizer plunger 26, which levers the wheels 20, 21 with the levers 24, 25 against the stop in the wall of the studied well, locating the delivery device in its center. With further rotation of the wheels 10, 11 of the mover, the entire arrangement moves along the wall of the well over the entire length of the investigated area.

The lifting device for re-research or retrieval from the well is carried out by winding the cable onto the logging winch drum. At the entrance to the tubing string from an open wellbore, the proppants 4, 5 add up with a pulling force, interacting with a funnel mounted at the end of the tubing string. When folding the supports 4, 5, the propeller plunger 19, moving downward, with an emphasis 27, moves the centralizer plunger 26 down, while folding the centralizer wheels 20, 21. The descent of the device into a well under pressure and equipped with a wellhead device (lubricator) is achieved by installing the wheels of the mover on the wedging supports, which ensures small dimensions of the mover, and the increase in speed due to the continuity of the translational movement of the device.

Improving the passage of the joints of the couplings is achieved by increasing the diameter of the wheels of the mover due to the installation of proppants supporting the wheels with an offset along the length of the housing. Moreover, the uniformity (without distortions and unilateral displacements) of their disclosure is ensured by the presence of sectors of cylindrical gears interacting with wedging supports.

The presence of a centralizer ensures the movement of the device in the center of the well, which ensures the passage of rigid formations on the wall. The presence of a spring-loaded propulsion plunger provides a sufficiently rigid pressing of the propulsion wheels to the well wall by increasing the stiffness of the spring, which provides increased traction.

All of the above increases the reliability of the device.

Claims (1)

A device for delivering devices to a horizontal well, comprising a cylindrical body with an electric motor and a reduction gear, wedging supports and a thruster made in the form of wheels with a radius of curvature equal to the radius of the well under investigation, mounted on shafts of wedging supports, characterized in that it is additionally equipped with centralizer wheels mounted on the shafts of the levers pivotally connected to the housing and the spring-loaded centralizer plunger, equipped with a stop cooperating with the propeller plunger, In this case, the wedging supports are installed with an offset along the body length, equipped with sectors of cylindrical gears and pivotally connected by levers to a spring-loaded plunger of the propulsion device, and each wheel is connected to a reduction gear by a worm gear, one of the shafts of which is equipped with a lead screw and a spindle nut, the groove of which is included in protrusion of the stopper installed in the housing.