CN2641267Y

CN2641267Y - Ball head shaped, hanging type jointing hoop

Info

Publication number: CN2641267Y
Application number: CN 03214293
Authority: CN
Inventors: 王建文; 张飘石; 顾宏伟; 康少伟
Original assignee: SHUGUANG ENGINEERING TECHNOLOGY OFFICE LIAOHE PETROLEUM EXPLORATION BUREAU
Current assignee: SHUGUANG ENGINEERING TECHNOLOGY OFFICE LIAOHE PETROLEUM EXPLORATION BUREAU
Priority date: 2003-07-24
Filing date: 2003-07-24
Publication date: 2004-09-15
Anticipated expiration: 2013-07-24

Abstract

The utility model relates to a ball type suspension style coupling for interconnecting sleeves in an oil well and oil pipes of sand sluicing pipe column in a deformed well in an oil field. The coupling comes with a soft flexible ball type suspension style structure which can rotate and deflect freely between two oil pipes, and is developed on the basis learning the prior problem of the prior art. Therefore the utility model solves the problem of the prior art in that: during the course of sand sluicing, the oil pipe breaking out, bending accidents due to the sand sluicing pipe column blocking, breaking and flattening can happen on the deformation sections of the sleeves. The utility model has the technical points that the coupling is designed in a ball type suspension style structure, which can rotate and deflect freely between the oil pipes by 15 to 20 degrees. The utility model can be extensively applied in sand sluicing working process in thick, diluted well sleeves, complete fine wells, deformed wells, serious sand accumulating wells and sleeve deformed well with sleeve diameter shrinkage above and beyond 110mm.

Description

A kind of bulb-type suspension type box cupling

Technical field:

The utility model provides " a kind of bulb-type suspension type box cupling " that connects usefulness between a kind of oilfield middle sleeve distortion well sand surfing tubing string oil pipe.

Background technology:

Present oil-field thick-oil, the thin oil well is after production after a while, because gas injection is heated, the geostatic stress influence, perforation, reasons such as sleeve pipe material, sleeve shrinking diameter can appear, distortion, damages such as bad break, when going out Sha Jingzai and carry out the sand washing operation, the sand washing tubing string can occur in the casing deformation section when adopting conventional " the hard connection " sand surfing tubing string sand washing is hampered, fracture, squeeze flat, accidents such as oil pipe shackle, can't carry out the sand washing operation, the inventor is developed into " a kind of bulb-type suspension type box cupling " according to years'experiences in conjunction with the site operation operation, and it is to can be implemented in the flexible structure that rotates freely between two oil pipes with 15 °～20 ° of deflections, using this box cupling sand clean out pipe through distortion well section the time can become with the sleeve pipe trend, the oil pipe shackle can not appear in the radially moment that has overcome tubing bending and produced, accidents such as bending.

The utility model content:

In order to overcome sand output well when carrying out the sand washing operation, the circuitous resistance of sand washing tubing string can occur in the casing deformation section when adopting the sand washing of the hard connection of routine sand washing tubing string, fracture, squeeze deficiency flat, oil pipe, the utility model provides a kind of bulb-type suspension type box cupling.This box cupling can rotate freely between two oil pipes and 15～20 ° of deflections, it is a kind of flexible structure, sand clean out pipe can become with the sleeve pipe trend through distortion well section the time, overcome the radially moment that tubing bending produces, the oil pipe shackle can not appear, accidents such as bending have solved the difficult problem that casing deformation well can't carry out the sand washing operation.

The technical scheme that its technical problem that solves the utility model adopts is: this box cupling is at thick, the intact well of thin oil sleeve pipe, the distortion well, the especially severe well that shakes out is developed, because the frequent gas injection of heavy oil wells makes perforated interval sleeve pipe generation gross distortion, undergauge, crooked, dislocation etc., when the sand washing tubing string through out-of-date shackle can take place, crooked, towards accident such as motionless even stuck, therefore tubing coupling is developed into the bulb-type suspended structure, this structure can make and can rotate freely between two oil pipes and 15～20 ° of deflections, and the long oil pipe shortened to 3m, sand clean out pipe can become with the sleeve pipe trend through distortion well section the time, hang bulb and can overcome the radially moment that produces because of casing buckling, the oil pipe shackle can not occur, accidents such as bending.The utility model is earlier ball cup to be put into lower cover, and then will hang bulb and put into ball cup and tighten top connection, after has assembled on top again with lower contact and the cylindrical portions may that hangs bulb with being threaded, with safetied pin upper and lower part locking is then constituted bulb-type suspension type box cupling again, it connects the sand washing oil pipe on being, afterbody connects nib.At the scene during construction operation, 2～3 times of sand cleaning fluids that volume is clean are prepared on ground, during down to the above 30m of cover height, lowering velocity should be less than 1.2m/min, think circuitous sand face when descending 10～20KN with suspending weight, connect and visit twice, to carry on the sand surfing tail pipe as for more than Shamian Island 3m, then well head is adorned self-styled, connect surface line, the sand surfing tubing string is slowly transferred in the circulation of turn on pump car after liquid is seen in outlet, pressurization is no more than 20KN during circuitous resistance, the fully circulation that at every turn makes up a joint, duration of well flushing is not less than 15min, dashes under wanting can continue in one week of well-flushing after 5 of continuous sand flushings are single, sand surfing keeps the above discharge capacity of 400L/min to continue circulation to the artificial bottom of a well, is qualified its tubing string of sand washing to exporting sand content less than 0.2%.

The beneficial effects of the utility model are, adopt this box cupling, free to rotate between the oil pipe, prevent oil pipe thread off at deformation section, crooked, fracture, but free deflection is 15～20 ° between the oil pipe, and the position that produces moderate finite deformation point at sleeve pipe can be passed through smoothly, and leakage is few, 100m sand surfing pipe (30 pipe nipples) leakage is less than 3%, and the active section tension is greater than 500KN.

Description of drawings:

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is the utility model overall structure schematic diagram.

Among the figure 1, top connection, 2, sealing ring, 3, lower cover, 4, hang bulb, 5, ball cup, 6, safetied pin, 7, lower contact.

The specific embodiment:

In Fig. 1, be cylindrical shape with the outside earlier, cylindrical shape lower cover 3 is put into for semicircular ball cup 5 in inside, be top spheroidal then, the bottom is that columnar suspension bulb 4 is put into ball cup 5, and the cylindrical shape top connection 1 that will be threaded with lower cover 3 is tightened again, after this box cupling top assembling, again columnar lower contact 7 is threaded with the cylindrical portions may that hangs bulb 4, then, with safetied pin 6 lockings.

Claims

1, a kind of bulb-type suspension type box cupling, it is characterized in that: be cylindrical shape with the outside earlier, cylindrical shape lower cover (3) is put into for semicircular ball cup (5) in inside, be top spheroidal then, the bottom is divided into columnar suspension bulb (4) and puts into ball seat (5), the cylindrical shape top connection (1) that will be threaded with lower cover (3) is tightened again, after this box cupling top assembling, again columnar lower contact (7) is threaded with the cylindrical portions may that hangs bulb (4), then uses safetied pin (6) locking.