CN2479189Y

CN2479189Y - Downhole choke

Info

Publication number: CN2479189Y
Application number: CN 01220389
Authority: CN
Inventors: 范玉平; 张瑛; 程广东; 王锦生; 吕福荣
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2001-04-29
Filing date: 2001-04-29
Publication date: 2002-02-27
Anticipated expiration: 2011-04-29

Abstract

Disclosed is a down-hole reducer which is composed of an abruption rod 1, pins 2, a salvage head 3, a watt-carrying ring 4, an opening ring 5, an outer pipe 6, slips 7, a center tube 8, an upper sealed rubber cartridge, a pulling ring 10, a lower sealed rubber cartridge 11, a moving cartridge 12, a center pulling tube 13, a sealed cushion 14, an air cock 15, an inner cartridge 16, a spring 17, a supporting cartridge 18, a gland 19, a fixing screw 20, adjusting nuts 21 and adjusting bolts 22. Because the utility model employs the air cock device provided inside the inner cartridge, the nuts can be adjusted by the production gas, and throttle can be realized inside a production tube of a borehole. The utility model can fully use the heat energy of the ground layer to prevent freezing and blocking of the pipe lines of the mine mouth. The production of the utility model is smooth and steady, which can prevent activation of a pay-zone, and increase the liquid-carrying capacity of a gas wall. The over-ground restriction of the gas well is changed into the underground restriction, and the land surface flow path is changed into low pressure gas transmission, and a choke of the ground surface is changed and provided under the well, which greatly reduces noise. The utility model can provide great environmental protection when the technology is employed by peripheral gas well of dwelling area.

Description

Underground throttle device

The utility model relates to the downhole tool that uses on a kind of oilfield, particularly a kind of underground throttle device.

In oil field development, the general water jacket furnace that adopts heats, and the method for configuration oil nozzle is produced behind the stove, and its disadvantage is that investment is big, the power consumption height, the technology relative complex, and from well head to being in high pressure conditions between the oil nozzle all the time, be unfavorable for the safety in production and daily management, simultaneously, the water jacket furnace heating increases labor strength, management is difficult, and noise is big, thereby has influenced Oilfield developing effect and returns of investment.

The purpose of this utility model is to provide a kind of underground throttle device, and it can save the drawback that the water jacket furnace heating is brought, and has saved cost and has improved operating efficiency.

The purpose of this utility model is to realize like this, it is by breaking rod (1), pin (2), fishing head (3), tile-carrying ring (4), split ring (5), outer tube (6), slips (7), central tube (8), last cartridge (9), pushing ring (10), lower seal packing element (11), movable tube (12), center ejector sleeve (13), sealing mat (14), valve (15), inner core (16), spring (17), support tube (18), gland (19), fixed screw (20), adjusting nut (21), adjusting screw(rod) (22) is formed, breaking rod (1) is connected by pin (2) with outer tube (6), on tile-carrying ring (4), be connected to fishing head (3), be connected with slips (7) on the split ring (5) and place the outside of outer tube (6), central tube (8) is threaded under the outer tube (6), last cartridge (9) is loaded on the lower end of outer tube (6), be with pushing ring (10) on the central tube (8), and be connected with inner core (16) support tube (18) respectively, lower seal packing element (11) is enclosed within on the pushing ring (10), in inner core (16), be followed successively by center ejector sleeve (13) from top to bottom, sealing mat (14), valve (15), adjusting screw(rod) (22), spring (17), gland (19) is connected on the outer tube lower end, fixed screw (20), adjusting nut (21) is screwed on the adjusting screw(rod) (22), and fixing by fixed screw (20).

During work, with a certain position under this restriction choke lower going-into-well, upper lifting pipe post, pin is cut off, and slips opens, seat envelope two packing elements, gas by support tube (18) eyelet, pass the throttling valve of inner core, realize downhole choke, make down-hole high pressure gas carry out step-down, expansion underground, the earth is used as the thermal energy exchange place, fully absorb underground heat, improve gas temperature, make the output of band wet body low pressure, stop using behind the water jacket furnace, can guarantee that still well head and ground flow do not freeze, stifled phenomenon.

The utility model since adopted inner core in gas nozzle structure, by production tolerance adjusting nut, throttling in the pit shaft flow string makes full use of stratum heat energy, it is stifled to prevent that the well head pipeline from freezing; Produce steadily, prevent the payzone excitement; Increase the fluid-carrying capability of gas well, gas well is changed into underground throttling by the ground throttling, and ground flow becomes the low pressure gas transmission, and surface choke becomes the down-hole and is provided with, and greatly reduces noise, and residential block periphery gas well takes this technology having very big environment protection significance again.

Accompanying drawing structural representation of the present utility model.

Below in conjunction with accompanying drawing the utility model is further specified.

As shown in the figure, the utility model by break rod 1, pin 2, fishing head 3, tile-carrying ring 4, split ring 5, outer tube 6, slips 7, central tube 8, go up cartridge 9, pushing ring 10, lower seal packing element 11, movable tube 12, center ejector sleeve 13, sealing mat 14, valve 15, inner core 16, spring 17, support tube 18, gland 19, fixed screw 20, adjusting nut 21, adjusting screw(rod) 22 form its total length: 800mm; Maximum outside diameter: 58mm; Flow nipple length: 30mm; Restriction choke mouth aperture: 5mm; Weight: 7Kg is withstand voltage :≤35Mpa.This practicality newly mainly is applicable to the higher gas well of strata pressure (the general requirements strata pressure is more than 2 times of distribution pressure), the less gas well (every all places gas daily fluid production rate is less than 3-15 side) of production fluid amount; And sand output well not.

Main feature:

(1) input and convenient to remove, available rope tool is placed on oil pipe with flow controller

The optional position;

(2) can utilize the underground heat after the throttling to prevent that pit shaft and well head from freezing and hyrate

Form;

(3) simplify collection transfer device and ground flow, convenient management;

(4) realize the low pressure gas transmission, reduce noise, improve safety factor.Corollary equipment: crane, well testing truck, lubricator etc.

Claims

1, a kind of underground throttle device, it is by breaking rod (1), pin (2), fishing head (3), tile-carrying ring (4), split ring (5), outer tube (6), slips (7), central tube (8), last cartridge (9), pushing ring (10), lower seal packing element (11), movable tube (12), center ejector sleeve (13), sealing mat (14), valve (15), inner core (16), spring (17), support tube (18), gland (19), fixed screw (20), adjusting nut (21), adjusting screw(rod) (22) is formed, it is characterized in that: break rod (1) and be connected by pin (2) with outer tube (6), on tile-carrying ring (4), be connected to fishing head (3), be connected with slips (7) on the split ring (5) and place the outside of outer tube (6), central tube (8) is threaded under the outer tube (6), last cartridge (9) is loaded on the lower end of outer tube (6), be with pushing ring (10) on the central tube (8), and be connected with inner core (16) support tube (18) respectively, lower seal packing element (11) is enclosed within on the pushing ring (10), in inner core (16), be followed successively by center ejector sleeve (13) from top to bottom, sealing mat (14), valve (15), adjusting screw(rod) (22), spring (17), gland (19) is connected on the outer tube lower end, fixed screw (20), adjusting nut (21) is screwed on the adjusting screw(rod) (22), and fixing by fixed screw (20).

2, underground throttle device according to claim 1 is characterized in that: length: 800mm; Maximum outside diameter: 58mm; Flow nipple length: 30mm; Restriction choke mouth aperture: 5mm; Weight: 7Kg is withstand voltage :≤35Mpa.