CN2926580Y

CN2926580Y - Multi-stage sandproof oil pump

Info

Publication number: CN2926580Y
Application number: CN 200620092568
Authority: CN
Inventors: 冯金财
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-07-25
Filing date: 2006-07-25
Publication date: 2007-07-25
Anticipated expiration: 2016-07-25

Abstract

The utility model relates to a multilevel sand protection pumping unit, which comprises a pump barrel, a standing valve assembly, a slide valve, an upper coupling and a lower coupling; wherein, the outer part of the oil inlet of the lower coupling is provided with a sand protection cover which is provided with an oil inlet, and the traveling valve on the plunger is provided with a slide rod which is provided with slide valve slipping in the axial direction. The utility model is characterized in that through a plurality of sand protection measures, the sand block and burying problems occurring during the oil extraction process in the oil field of relatively large sand content have been effectively solved, thus greatly improving the service life of the pumping unit. Further, the utility model has the advantages of simple structure, convenient manufacture and maintenance as well as high working efficiency.

Description

Multistage sand-proof oil-well pump

Technical field

The utility model relates to a kind of liquid pump, especially for the oil well pump from the down-hole lifting fluid.

Background technique

The most of oil fields of China have entered the later stage mining phase at present; the sand production situation is more and more serious; sand content is also more and more in the crude oil; cause oil well pump that pulling of plunger and pump barrel working surface in use often taken place and the sand card takes place, sand buries; especially run into shutdown; it is more serious that sand buries phenomenon, the working life of reducing oil well pump greatly.Existing oil well pump adopts strike-off cup and spiral to strike-off to solve the sand card problem between plunger and the pump barrel mostly, solution sand buries and then adopts the bottom of oil well pump that sand-precipitating tube is set, bury problem though can solve the sand of oil well pump to a certain extent, but limited by the sand-precipitating tube radical of adorning, when sand content in the crude oil is very big, still difficult thoroughly solution.Particularly run under the situation of repeatedly long-time stop pumping, sand still can take place bury phenomenon.

Summary of the invention

The purpose of this utility model is to provide a kind of multistage sand control function that has, and prevents that effectively sand card, sand from burying, the oil well pump that prolongs its working life.

Technology solution of the present utility model is: a kind of multistage sand-proof oil-well pump, comprise pump barrel, plunger piston assembly, standing valve assembly, guiding valve, upper and lower box cupling, it is characterized in that being provided with sand cap in the outside of following box cupling oil inlet hole, be furnished with oil inlet hole on it, plunger upper travelling valve joint is connected with pull bar, one of suit guiding valve in axial sliding on it.

Outside the box cupling oil inlet hole sand cap is being set down, crude oil enters oil well pump through oil inlet hole, can reduce the sand content that enters oil well pump with many big sand grains retainings outside pump barrel like this, plays preliminary sand control function.On plunger upper travelling valve joint a subtie and guiding valve are housed, the two is for movingly, and guiding valve can move axially along pull bar.When plunger was up, the liquid stream of lifting was washed guiding valve open and is discharged in the transport pipe, wherein containedly continue to be carried to ground with oil than the granule sand grains, and the sand grains of larger particles dropped to sand storing tube.When plunger was descending, guiding valve covered pump barrel, and the sand grains that makes sinking can not fall into pump barrel and sink in the sand storing tube below the pump by the annular pass between urceolus and the pump barrel.If during stop pumping, guiding valve cuts out the pump barrel upper end for some reason, the sand grains on the pump in the fluid column also sinks in the sand storing tube by the annular pass, so this oil well pump can prevent effectively that all sand card and sand from burying when suction and stop pumping.Also by the interior chamfering that is provided with at the plunger body top interior chamfering that sword and lower travelling valve bottom be provided with of strike-ofing, when moving vertically, scrape off sand grains and impurity on the pump barrel wall, make it directly enter into crude oil, together be extracted into abovegroundly with it, avoid pulling and the sand card taking place of plunger and pump barrel.Be provided with the sand setting passage that is connected with transport pipe, make and to sink in the sand storing tube by the sand setting passage with sand grains and the impurity that crude oil together is extracted into ground, avoided sand to bury, prolonged oil well pump working life than coarsegrain.

Characteristics of the present utility model are: by taking multiple sand control measure, effectively solved sand card and the sand that occurs that recovers the oil and bury problem in the big oil field of sand content, improved the working life of oil well pump greatly.Oil well pump simple in structure, make easy to maintenance, high working efficiency.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

The utility model is described in further detail below in conjunction with accompanying drawing for embodiment:

As shown in Figure 1, the multistage sand-proof oil-well pump that provides of present embodiment is made up of pull bar, guiding valve, upper and lower box cupling, pump barrel, plunger piston assembly, standing valve assembly, urceolus, sand storing tube and sand cap.Plunger piston assembly is made of upper travelling valve joint 4, plunger body 7, two move about valve ball 5-1,5-2, two move about valve seat 6-1,6-2, lower travelling valve cover 8, lower travelling valve seated connection heads 9.The upper travelling valve upper end of joint joins by screw thread and pull bar 20, is with a guiding valve 1 on the pull bar external cylindrical surface, and for movingly, guiding valve can be along the pull bar axial motion between guiding valve and the pull bar.Upper travelling valve joint lower end and plunger body internal thread fuse and the valve seat 6-1 that moves about that will be arranged on the plunger body boss fixes.The valve ball 5-1 that moves about is housed in the upper travelling valve joint, and four radially oil outlets are established by 90 ° of intervals in the upper end, and this hole is the inclined hole of 10 ° of inclinations.The plunger body bottom is connected with the outside thread of lower travelling valve cover 8.Both external diameters measure-alike.The bottom of the top of plunger body and lower travelling valve cover is equipped with the sword of strike-ofing.The valve ball 5-2 that moves about is housed in the lower travelling valve cover, and the valve seat 6-2 that moves about is fixed in the valve bonnet boss that moves about by lower travelling valve joint 9.Plunger piston assembly is arranged in the pump barrel 10.The standing valve assembly is to be made of standing valve cover 11, fixed valve ball 12, fixed valve base 13 and fixed valve base joint 14, standing valve cover is threaded with the pump barrel lower end, fixed valve ball and fixed valve base are housed in the standing valve cover, and the latter is fixed in the standing valve cover by means of fixed valve base joint 14.Be provided with urceolus 3 in the pump barrel outside, constituted annular sand setting passage 22 between it and the pump barrel, the upper end of urceolus is threaded with last box cupling 2, and its lower end is threaded with following box cupling.Pump barrel upper end is inserted in the box cupling, and the inner cylindrical surface of it and last box cupling is at regular intervals, and by uniform setting on the last box cupling inwall three prop up point locations, and this spacing has constituted the sand setting passage, and it communicates with sand setting passage 22.Following box cupling is made of interior cover 16 and overcoat 15, and interior cover one end is connected with fixed valve base joint 14, and the other end supports and is sitting on the inner edge of overcoat, and the outside of overcoat oil inlet hole is provided with sand cap 19, is furnished with oil inlet hole on it, and the overcoat lower end is threaded with sand storing tube 17.The inside and outside cover position that contacts is combined as a whole with welding method.Interior cover radially has oil inlet hole 21, communicates with axial oily passage.Process the sand setting passage between interior cover and the overcoat, this passage is connected sand setting passage 22 with sand storing tube.18 is the plug of sand storing tube, and the size of sand storing tube volume depends on the sand content and the desired pump detection period of crude oil.

Claims

1, a kind of multistage sand-proof oil-well pump, comprise pump barrel, plunger piston assembly, standing valve assembly, guiding valve, upper and lower box cupling, it is characterized in that being provided with sand cap in the outside of following box cupling oil inlet hole, be furnished with oil inlet hole on it, plunger upper travelling valve joint is connected with pull bar, one of suit guiding valve in axial sliding on it.