RU2179636C1 - Logging hoist - Google Patents

Abstract

FIELD: industrial geophysics. SUBSTANCE: logging hoist can be employed to run in and pull out down-hole logging instruments. Hoist has winch drum with cable carrying down-hole logging instruments wound on it, drive with device adjusting rotation speed of winch drum with hydraulic pump and control desk. Device adjusting rotation speed of winch drum comes in the form of two planetary gears whose input central pinions are interconnected by gearing linked to driving shaft. Output central pinions are linked via gear-wheels to driven shaft and sprocket of chain transmission transmitting rotation to winch drum. Pinion carrier of each planetary gear are connected to hydraulic pumps whose inlets communicate with case of oil-filled adjusting device and whose outlets communicate with controllable differential throttle unit which outlet is connected to case of adjusting device. Controllable differential throttle unit is linked to servomotor. EFFECT: simplified design of hoist, increased smoothness and provision for uninterrupted change of speed of movement of logging cable in logging hoist. 1 dwg

Description

 The invention relates to field geophysics and can be used for lowering and lifting downhole tools.

 Known logging elevator containing a frame, on one part of which is located the operator’s cabin, and on the other - a hydraulic winch, cable stacker with hydraulic cylinder and brake [1].

 A disadvantage of the known device is the complexity of the drive, containing a hydraulic pump and a hydraulic motor with variable performance, as well as the low accuracy of regulating the speed of descent and ascent of a downhole tool.

 The closest to the claimed design and achieved results is a logging hoist, adopted as a prototype, containing a variable displacement hydraulic pump connected to a drive motor and a hydraulic motor connected to a winch drum, a power amplifier connected to a stepper motor connected through a gearbox to a rotary hydraulic pump housing cable with downhole tools wound on a winch drum and control panel [2].

 The disadvantages of this device are its complexity and lack of smoothness and discrete (step) nature of the regulation of the speed of the cable.

 The problem solved by the invention is to simplify the device, increase smoothness and the continuous (stepless) nature of the change in the velocity of the wireline.

 The problem is solved in that the logging elevator containing the hydraulic pump, the winch drum with a cable wound on it with downhole tools, a drive with a winch drum speed control device and a control panel, is equipped with a second hydraulic pump, the drive is made in the form of a servomotor and a controlled throttle connected to it devices, and the device for controlling the rotation speed of the drum is made in the form of two planetary mechanisms, the input central gears of which are connected to each other by gears th gear connected to the drive shaft, and the output central gears through gears are connected to the driven shaft and the chain sprocket transmitting rotation to the winch drum, and the planet carrier of each planetary gear is connected to hydraulic pumps, the inlet openings of which are connected to the internal volume of the oil-filled housing control devices, and the outlet openings with a controlled differential throttle device, the output of which is also connected to the internal volume of the device regulation of the rotation speed of the winch drum.

The drawing shows a diagram of a logging elevator, where:
1 - winch drum;
2 - planetary mechanisms with satellite carriers;
3 - input central gears of planetary gears;
4 - gears;
5 - drive shaft of the drum rotation speed control device;
6 - output central gears of planetary gears;
7 - gears;
8 - the driven shaft of the device for controlling the rotation speed of the drum;
9 - an asterisk of a chain transmission;
10 - hydraulic pumps with inlet and outlet openings;
11 - control device housing;
12 - controlled differential throttle device;
13 - servomotor.

 14 - driven winch drum sprocket.

 In the housing 11 of the device for controlling the speed of rotation of a drum filled with oil, two planetary mechanisms are placed with carriers of satellites 2 connected to a drive shaft 5 of a device for controlling the speed of rotation of a drum receiving rotation from a machine engine (not shown in the figure). The input Central gears of planetary gears 3 are connected by gears; output central gears of planetary gears 6 are connected via gears to the driven shaft 8 of the drum rotation speed control device with a chain sprocket 9. Using the chain transmission of the sprocket 9, the rotation is transmitted to the sprocket 14 of the winch drum 1. The planetary gear satellites are connected to the hydraulic pumps 10 through the carrier 10. The inlet openings of the hydraulic pumps 10 are connected to the internal volume of the housing 11 of the drum rotation speed control device, and the outlet openings of the hydraulic pumps are connected to a controlled differential throttle a device 12 rotated by a servomotor 13. The output of a controlled differential throttle device 12 is also connected to the internal volume of the housing 11 devices for regulating the speed of rotation of the drum.

 The device operates as follows.

 At the initial moment of time, the controlled differential throttle device 12 is open, and the drive shaft 5 rotates the input central gears 3 of the planetary gears through gears 2. Simultaneously, the satellites and carriers of the planetary gears rotate, while their rotation is transmitted to the shafts of the hydraulic pumps 10, which pump oil from the device’s body regulation 11 through a controlled differential throttle device 12, returning oil back to the housing 11 of the device for controlling the rotation speed of the drum without any resistance. At this moment, the driven shaft of the drum rotation speed control device does not rotate, and the winch drum 1 does not receive rotation from the chain drive.

 In order for the driven shaft 8 of the drum rotation speed control device and the chain sprocket 9 to begin to rotate, it is necessary from the control panel (not shown) to start using the servomotor 13 to smoothly close the controlled differential throttle device 12, turning the valve in one direction, in depending on whether it is necessary to raise or lower the downhole tools. Then, on one of the hydraulic pumps, hydraulic resistance arises, leading to the appearance of braking torque on the hydraulic pump shaft. Then the carrier of the corresponding planetary gear slows down its rotation, and the gear of the planetary gear starts to rotate under the influence of its satellites and drives the driven shaft 8 of the drum rotation speed control device and the chain sprocket 9, and with it through the chain gear, the driven sprocket of the winch drum 14 . As the controlled differential throttle device 12 closes, the rotation speed of the winch drum 1 increases, and when the controlled differential throttle device 12 is completely closed, the rotation speed of the winch drum 1 reaches its maximum value, because the corresponding hydraulic pump stops the corresponding planetary gear carrier and the gear ratio of the planetary gear becomes equal to one.

 To change the direction of rotation of the winch drum 1, it is sufficient to close the controlled differential throttle device in the opposite direction to that described above.

 Moreover, the rotation speed is proportional to the resistance to oil flow at the pump outlet, i.e. hydraulic pumps are used for a new purpose - as a brake device.

 The effectiveness of the proposed device is due to the fact that with a fairly simple design, it has the ability to smoothly control speed and reverse without disengaging the kinematic chain.

Compared with known devices of a similar purpose, the proposed technical solution also has the following advantages:
- high reliability due to the simplicity of the design;
- increased range of stepless speed control of the winch drum.

Sources of information
1. Auth. St. 1596096, Е 21 В 47/00, BI 36, 1990.

 2. Auth. St. 1654557, E 21 B 47/00, BI 21, 1991.

Claims (1)

 A logging hoist containing a hydraulic pump, a winch drum with a cable wound on it with downhole tools, a drive with a winch drum speed control device and a control panel, characterized in that it is equipped with a second hydraulic pump, the drive is made in the form of a servomotor and a controlled throttle device connected to it and the device for controlling the rotation speed of the drum is made in the form of two planetary mechanisms, the input Central gears of which are connected by a gear transmission, with connected to the drive shaft, and the output central gears through gears are connected to the driven shaft and the chain drive sprocket transmitting rotation to the winch drum, and the planet carrier of each planetary gear is connected to hydraulic pumps, the inlet openings of which are connected to the internal volume of the speed control device’s oil-filled housing winch drum rotation, and outlet openings - with a controlled differential throttle device, the output of which is also connected to the internal volume th adjustment device housing the winch drum rotational speed.