CN201934052U - Multifunctional downhole device capable of negative-pressure block removal and anti-backflow hole cleaning - Google Patents

Abstract

The utility model belongs to a downhole operation tool in oil industry, and particularly relates to a multifunctional downhole device capable of negative-pressure block removal and anti-backflow hole cleaning. The device comprises an upper joint (1), a central tube (8), a pressure cap (15), a shear pin (17), and a lower joint (18), wherein a rupture disk (3) is arranged in a ring channel on the side wall of the upper joint (1); a rupture disk screw (2) with a central hole formed thereon is in threaded connection with the upper joint (1) and is press-mounted on the outer side of the rupture disk (3); a pattern board (4) is limited in the inner chamber of the upper joint (1); the upper joint (1) is in threaded connection with and sleeved at the upper end of the central tube (8); a valve seat (6) and a valve seat spring (7) are sequentially limited in the central tube (8); a steel ball (5) is mounted on the valve seat (6); an overflow channel (6-1) is arranged on the valve seat (6); and a limit sheath (10) is mounted on the central tube (8). The device adopts double leather cups as a sealing piece; the service life of the tool is prolonged; and inverse hole cleaning is possible.

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, exploitation day by day along with 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 by oil reservoir self-energy mediation blocking channel.

Summary of the invention

The purpose of this 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 volume increase.

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, 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, the spacing successively valve seat that is equipped with in the central tube, seating spring, steel ball is contained on the valve seat, 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, two elastic shelfs respectively with sheath, the pressure cap support leather cup that is threaded is in the lower contact upper surface of device, form negative pressure cavity between central tube and the sealing ring taps.

The beneficial effects of the utility model are: 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, leather cup is in the protective sleeve when going into the well, damage leather cups such as process middle sleeve box cupling prevent to go into the well, going into the well puts the back in place to the oil jacket annulus water injection, discharges leather cup by oil jacket annular pressure seat envelope; Leather cup adopts elastic shelf to support, the assurance leather cup is opened fully, guarantees the sealing reliability of device, and device is provided with stop collar, can guarantee that double leather cup all can discharge, device is provided with floated ball-and-seat, and flushing fluid pours in down a chimney the stratum in the time of can preventing well-flushing, causes the oil reservoir cold damage, 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, form negative pressure cavity A between lower contact 18 upper surfaces, central tube 8 and the sealing ring taps 16 of device.

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, finish the seat envelope.Along with pump is adopted, below preventing pouring in down a chimney multifunctional well lower device inner chamber, negative pressure de-plugging well-flushing forms negative pressure cavity A, 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, rupture disk 3 explosion under the effect of hydraulic pressure is opened inject certain pressure in Peng after, 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), top connection (1) is threaded and is sleeved on the upper end of central tube (8), the spacing successively valve seat (6) that is equipped with in the central tube (8), seating spring (7), steel ball (5) is contained on the valve seat (6), valve seat (6) is provided with flow channels (6-1), stop collar (10) is contained on the central tube (8), two leather cups (13) vulcanize respectively on sheath (12) and pressure cap (15), two elastic shelfs (9) respectively with sheath (12), pressure cap (15) is threaded and supports leather cup (13), in lower contact (18) upper surface of device, form negative pressure cavity (A) between central tube (8) and the sealing ring taps (16).