CN202402004U - Negative pressure de-plugging well-flushing anti-backflow multifunctional underground device - Google Patents

Abstract

The utility model belongs to tools for petroleum industry underground operation, and particularly relates to a negative pressure de-plugging well-flushing anti-backflow multifunctional underground device. The multifunctional underground device comprises an upper joint (1), a center pipe (8), a pressing cap (15), a shear pin (17) and a lower joint (18), wherein a rupture disk (3) is arranged in an annular groove on the side wall of the upper joint (1); a rupture disk screw (2) with a center hole is in threaded connection with the upper joint (1) and is pressed on the outer side of the rupture disk (3); a pattern plate (4) is limited in a cavity of the upper joint (1); the upper joint (1) is sleeved at the upper end of the center pipe (8) through threaded connection; a valve seat (6) and a valve seat spring (7) are limited in the center pipe (8) in sequence; a steel ball (5) is arranged on the valve seat (6); an overflow channel (6-1) is arranged on the valve seat (6); and a limiting sleeve (10) is arranged on the center pipe (8). A sealing element of the negative pressure de-plugging well-flushing anti-backflow multifunctional underground device adopts two leather cups, so that the service life of the tool is prolonged, and back flushing of a well can be performed.

Description

The anti-multifunctional well lower device that pours in down a chimney of negative pressure de-plugging well-flushing

Technical field

The utility model belongs to petroleum industry underground work instrument, the anti-multifunctional well lower device that pours in down a chimney of particularly a kind of negative pressure de-plugging well-flushing.

Background technology

At present; Domestic a lot of oil field has been in the later stage of recovering the oil, and along with the exploitation day by day of underground crude oil, the oil reservoir energy is more and more lower; Yield-increasing techniques such as acidifying are taked in the oil field; Improve crude output, be easy to stop up oil reservoir produce oil passage in the time of acidifying, the oil reservoir energy is low to be difficult to lean on the oil reservoir self-energy to dredge blocking channel.

Summary of the invention

The purpose of the utility model is to overcome above-mentioned technical deficiency, provides a kind of and dredge obstruction, helps the anti-multifunctional well lower device that pours in down a chimney of the negative pressure de-plugging well-flushing of taking out raising the output.

The technical scheme that the utility model technical solution problem adopts is: negative pressure de-plugging well-flushing prevents that pouring in down a chimney the multifunctional well lower device comprises top connection, central tube, pressure cap, shear pin, lower contact; Be characterized in being provided with rupture disk in the cannelure of top connection sidewall, the rupture disk screw that has centre bore is threaded with top connection and is fitted in the outside of rupture disk, and card is spacing to be contained in the inner chamber of top connection; Top connection is threaded and is sleeved on the upper end of central tube; Spacing successively valve seat, the seating spring of being equipped with in the central tube, steel ball is contained on the valve seat, and valve seat is provided with flow channels; Stop collar is contained on the central tube; Two leather cups vulcanize respectively on sheath and pressure cap, and two elastic shelfs support leather cup that is threaded with sheath, pressure cap respectively forms negative pressure cavity between lower contact upper surface, central tube and the sealing ring taps of device.

The beneficial effect of the utility model is: the anti-multifunctional well lower device seal that pours in down a chimney of negative pressure de-plugging well-flushing adopts double leather cup; Increase tool life; Leather cup adopts the sheath protection, and leather cup is in the protective sleeve when going into the well, and the process middle sleeve box cupling that prevents to go into the well etc. damage leather cup; Going into the well puts the back in place to the oil jacket annulus water injection, leans on oil jacket annular pressure seat envelope to discharge leather cup; Leather cup adopts elastic shelf to support, and the assurance leather cup is opened fully, guarantees the sealing reliability of device; Device is provided with stop collar, can guarantee that double leather cup all can discharge, and device is provided with floated ball-and-seat; Flushing fluid pours in down a chimney the stratum in the time of can preventing well-flushing, causes the oil reservoir cold damage, and device is provided with the level pressure demolition set; When reaching burst pressure, the well-flushing passage is opened, and can carry out anti-flushing well.

Description of drawings

Specify with embodiment below in conjunction with accompanying drawing.

Fig. 1 is the anti-multifunctional well lower device structure sectional view that pours in down a chimney of negative pressure de-plugging well-flushing.

Among the figure, the 1-top connection; 2-rupture disk screw; The 3-rupture disk; The 4-card; The 5-steel ball; The 6-valve seat; The 6-1-flow channels; The 7-seating spring; The 8-central tube; The 9-elastic shelf; The 10-stop collar; The 11-snap; The 12-sheath; The 13-leather cup; Adapter sleeve in the 14-; The 15-pressure cap; 16-seals ring taps; The 17-shear pin; The 18-lower contact; The A-negative pressure cavity.

The specific embodiment

Embodiment, with reference to accompanying drawing 1, negative pressure de-plugging well-flushing is anti-to be poured in down a chimney in the cannelure of top connection 1 sidewall of multifunctional well lower device and is provided with rupture disk 3, and the rupture disk screw 2 that has centre bore is threaded with top connection 1 and is fitted in the outside of rupture disk 3.Card 4 is spacing to be contained in the inner chamber of top connection 1; Top connection 1 is threaded and is sleeved on the upper end of central tube 8, spacing successively steel ball 5, valve seat 6, the seating spring 7 of being equipped with in the central tube 8 top inner chambers, and seating spring 7 supports valve seat 6; Steel ball 5 places on the valve seat 6, and valve seat 6 is provided with flow channels 6-1.Stop collar 10 is sleeved on the centre of central tube 8, and interior adapter sleeve 14 and sealing ring taps 16 are threaded, and spacing adapter sleeve is contained on the central tube 8.Thinization is on sheath 12 and pressure cap 15 respectively for two leather cups 13, and two elastic shelfs 9 are threaded with sheath 12, pressure cap 15 respectively and support leather cup 13.In the groove of adapter sleeve 14, leather cup 13, elastic shelf 9 were contained between central tube 8 and the sheath 12 in snap 11 was contained in.Central tube 8 lower ends are threaded with lower contact 18 upper ends, and sealing ring taps 16 is connected with lower contact 18 usefulness shear pins 17, between lower contact 18 upper surfaces, central tube 8 and the sealing ring taps 16 of device, form negative pressure cavity A.

The anti-course of work of pouring in down a chimney the multifunctional well lower device of negative pressure de-plugging well-flushing is: negative pressure de-plugging well-flushing is prevented that pouring in down a chimney the multifunctional well lower device is connected under the pump, together goes into the well with flow string.Go into the well put in place after, arrive certain altitude to oil jacket annulus water injection liquid level, sealing ring taps 16 is cut off shear pin 17 under the pressure of fluid column, adapter sleeve 14 in driving, pressure cap 15 are descending, discharge leather cup 13, accomplish the seat envelope.Along with pump is adopted,, negative pressure de-plugging well-flushing forms negative pressure cavity A below preventing pouring in down a chimney multifunctional well lower device inner chamber, under the differential pressure action of oil reservoir and negative pressure cavity A; Obstruction is rushed out, and the stratum oil transportation channel is opened, and rupture disk 3 explosion under the effect of hydraulic pressure is opened behind the injection certain pressure in Peng; Carry out anti-flushing well, steel ball 5 is descending under the effect of flushing fluid, compression seating spring 7; Steel ball 5 falls after rise in valve seat 6, prevents that flushing fluid from pouring in down a chimney the stratum.

Claims (1)

1. a negative pressure de-plugging well-flushing prevents pouring in down a chimney the multifunctional well lower device; Comprise top connection (1), central tube (8), pressure cap (15), shear pin (17), lower contact (18); It is characterized in that being provided with rupture disk (3) in the cannelure of top connection (1) sidewall; The rupture disk screw (2) that has centre bore is threaded with top connection (1) and is fitted in the outside of rupture disk (3); Card (4) is spacing to be contained in the inner chamber of top connection (1), and top connection (1) is threaded and is sleeved on the upper end of central tube (8), spacing successively valve seat (6), the seating spring (7) of being equipped with in the central tube (8); Steel ball (5) is contained on the valve seat (6); Valve seat (6) is provided with flow channels (6-1), and stop collar (10) is contained on the central tube (8), and two leather cups (13) vulcanize respectively on sheath (12) and pressure cap (15); Two elastic shelfs (9) are threaded with sheath (12), pressure cap (15) respectively and support leather cup (13), between lower contact (18) upper surface, central tube (8) and the sealing ring taps (16) of device, form negative pressure cavity (A).

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