RU2465432C2 - Self-contained oiler for analysis of oil and gas wells - Google Patents

Abstract

FIELD: oil and gas production.

SUBSTANCE: proposed oiler consists of connection flange, preventer, signaling device, intake chamber, seal assembly, guide rollers, hydraulic cylinder with hydraulic pump and hydraulic system hose. It is furnished with bracket with swivel cramp hinged to oiler posts. Intake chamber is fitted on said cramp. Besides, hydraulic cylinder with rod coupled with intake chamber lug is arranged on said cramp. Proposed design of oiler allows fitting it on production tree and dismantling there from by remote means with the help of hydraulic cylinder controlled by hydraulic pump. No handling equipment is required.

EFFECT: higher safety, reduced labor input.

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Description

The invention relates to the oil and gas industry, and in particular to devices providing geophysical research and work in oil and gas wells with instruments and tools on a flexible element (geophysical cable or scraper wire).

Known lubricator, consisting of a receiving chamber, a seal assembly, a preventer, a signaling device and a gripping device with a guide roller. The load gripping device is used for mounting-dismantling of the lubricator and its holding on the fountain reinforcement of the well. The lubricator is installed on the fountain with the help of a geophysical tower, i.e. lifting unit (see, for example, RF Patent for utility model No. 37148 class 7, ЕВВ 47/00, 2003).

The disadvantage of this design is the need to use for mounting-dismantling the lubricator and hold it in the process of carrying out studies of the lifting unit.

Also known is a lubricator containing a preventer, a receiving chamber, a seal assembly and a guide roller. The aforementioned lubricator is mounted on fountain fittings using a telescopic pipe mast with a hemp hoist system mounted directly on the fountain fittings. The mast is attached to the fountain reinforcement with a chain coupler (see, for example, Yu.V. Zaitsev et al. Development and repair of oil and gas wells under pressure. Pp. 164-165. M .: Nedra, 1982).

The design of such a lubricator allows you to install it on the gushing and perform well research and work without the use of a lifting unit.

The disadvantage of the described lubricator is that the installation and dismantling of the lubricator and operations to change downhole tools in the research process are time-consuming and unsafe. Maintenance personnel have to perform all installation work on the well’s fountain armature, which significantly limits the weight and dimensions of the lubricator and, accordingly, the area of its use. Such a lubricator should have a short and light receiving chamber and can only be used to study wells with low overpressure at the wellhead.

The essence of the invention is to reduce the complexity and increase the safety of installation and dismantling of the lubricator for fountain fittings and work when changing downhole tools in the process of researching a well, performing work in wells with high overpressure at the wellhead without using a lifting unit.

This is achieved by the fact that the lubricator is equipped with a bracket with a swivel bracket pivotally connected to its uprights. A receiving chamber is fixed to the rotary bracket of the bracket. A hydraulic cylinder is also installed on the bracket, the rod of which is connected with the eye of the receiving chamber.

With this design of the lubricator, the main part of the installation (installation of the receiving chamber in a vertical position) and dismantling (translation of the receiving chamber in an inclined position) is carried out remotely using a hydraulic cylinder controlled by a hydraulic pump. The same operations are used to change the geophysical instrument and then return the receiving chamber to a vertical position. The described design of the lubricator significantly reduces the complexity of the work, improves the working conditions of staff, increases its safety.

Work with a lubricator does not require the use of a lifting unit, so the lubricator is called autonomous.

The invention was implemented and tested in the field.

Figure 1 presents a diagram of an autonomous lubricator, figure 2 presents a diagram of a bracket with a rotary bracket.

An autonomous lubricator (Fig. 1) consists of a connecting flange 1, a preventer 2, a signaling device 3, a receiving chamber 4 with an eye 5, a sealing assembly 6 with a flexible element 7 and an upper roller 8, a lower roller 9, an arm 10 with a rotary bracket 11 ( figure 2), the hydraulic cylinder 12, mounted on the bracket 10 using the eyes 13 and 14. The swivel bracket 11 is mounted on the uprights 15 using the axles 16. The bracket 10 has a base 17 with a mounting hole 18. The hydraulic cylinder 12 has a rod 19 connected to the eye 5. The hydraulic cylinder 12 communicates with the pump 20 through Ukawa 21.

Work with an autonomous lubricator is as follows.

The flange 1, the preventer 2 and the signaling device 3 are manually mounted on the fountain armature of the well. The bracket 10 is mounted on the signaling device 10 on the mounting hole 18. The lower roller 9 is mounted on the flange 1. The receiving chamber 4 is assembled and fixed to the swivel bracket 11 of the bracket 10 with the seal assembly 5 and the upper roller 8. The initial position of the receiving chamber is shown in figure 1. The hydraulic cylinder 12 is installed and secured in the eyes 13 and 14 with the rod 19 in its lowest position. The rod 19 is fixed in the eye 5 of the receiving chamber 4. To the hydraulic cylinder 12 is connected to the pump 20 using the sleeve 21.

By pumping the working fluid from the tank (not shown) into the hydraulic cylinder 12, the pump 20 creates a working fluid pressure that develops a force on the rod 19, which rotates the receiving chamber 4 around the axes 16 of the bracket 10. The receiving chamber 4 goes into an inclined position, convenient for tightening in her geophysical downhole tool, which is mounted on the flexible element 7 through a specialized tip. The flexible element 7 is tucked into the lower roller 9. By pulling the flexible element 7, the downhole tool is retracted into the receiving chamber 4, after which the receiving chamber 4 is moved to a vertical position by pumping the working fluid with pump 20 and the receiving chamber 4 is connected to the signaling device 3. The working position of the receiving camera shown in figure 1

An autonomous lubricator in this position is fully prepared for geophysical exploration and work in the well.

If it is necessary to replace the geophysical downhole tool in the process of research, the device lowered into the well is pulled into the receiving chamber 4 by lifting it on the flexible element 7. The receiving chamber 4 is disconnected from the signaling device 3 and is pulled from the vertical by a rope guy previously tied to the seal assembly 6. At the same time the bleed valve of the pump 20 is opened, which ensures the flow of the working fluid from the hydraulic cylinder 12 into the tank of the pump 20. Next, the receiving chamber 4 is installed is tilted, convenient for changing the geophysical downhole tool. After changing the downhole tool, the receiving chamber 4 by pumping the working fluid with the pump 20 is again placed in a vertical position and the downhole tool is ready to be lowered into the well.

After completion of downhole research, the downhole tool is pulled into the receiving chamber 4, which is then disconnected from the signaling device 3 and transferred to the inclined position in the previously described sequence for removing the device. Then, the receiving chamber 4 is lowered to its lowest position and removed from the rotary bracket 11 with the rod 19 disconnected from the eye 5. Next, the remaining nodes of the autonomous lubricator are dismantled from the fountain valves in the reverse sequence.

Claims (1)

Autonomous oil and gas well lubricator, consisting of a connecting flange, a preventer, a signaling device, a receiving chamber, a sealing assembly, guide rollers, a hydraulic cylinder with a hydraulic pump and a sleeve of the hydraulic system, characterized in that a bracket comprising a base with struts and having a swivel bracket mounted on the axles of the struts, on which a receiving chamber is fixed, connected by an eye to the rod of the hydraulic cylinder, replicated on the basis of the bracket, as a result of which it is possible to remotely move the receiving chamber to the desired position during research and work in the well, and thereby reduce the complexity and increase the safety of installation and dismantling of the lubricator to the fountain fittings and operations to change the well instruments, and also provides research and work in wells with high overpressure at the wellhead without the use of a lifting unit.

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