CN2330809Y - Viscose oil pump for prevention of sand plug - Google Patents

Abstract

The utility model provides a tubular viscose oil pump for preventing sand plugging on thick oil wells containing sand in oil fields. The pump adopts a sand plugging preventing structure and a thick oil pumping structure, and a pump barrel and an elongated barrel of the pump barrel are fixed in the middle of a sand sediment barrel of the pump by a righting ring and a bi-pass coupling, annular sand sediment space which is formed from the pump barrel; the elongated barrel of the pump barrel, and the sand sediment barrel is communicated with a sand sediment tube below the pump, so that a sand sediment channel is formed; the bottom end of the sand sediment tube is connected with a plug. The pump comprehensively makes use of the sand plugging preventing structure and the thick oil pumping structure, so that the purposes of pumping thick oil and preventing sand plugging can be realized.

Description

A kind of sand control card thick oil pump

The utility model relates to a kind of oil well tubing pump, particularly a kind of improved sand control card thick oil pump.

Sealing by-pass flow device is equipped with on existing sand control suction pump top, make the viscous crude excavationg pump of being taken out flow to well head from the annular space of oil pipe and sleeve pipe later on, sand then sinks in the sand sediment pipe via the sleeve pipe annular space because of deadweight, light oil is arranged in the oil pipe, be used to reduce the frictional force that sucker rod moves up and down, oiling valve leans on the descending power enforced opening of sucker rod, the loss of plunger stroke in the time of can reducing the sucker rod commutation.In the prior art, the sand control suction pump can not fundamentally be eliminated the sand card, needs enough big submergence, needs light oil to lubricate sucker rod, if sand setting is too many, easily causes the packet can not deblocking etc.

The purpose of this utility model provides a kind of improved sand control card thick oil pump, it not only can prevent oil well pump sand card and scuffing of cylinder bore, improve the working life of oil well pump, liquid discharging valve is forced to close by sucker rod uplink and downlink power and is opened simultaneously, eliminate valve and open and close hysteresis, reduce the descending resistance of sucker rod in pit shaft, improve effective stroke, solve the descending slow problem of sucker rod.

Task of the present utility model is finished as follows: this pump annular sand setting space and sand control card structure part, form by long-plunger, short pump barrel, sand control cap, pump barrel lengthening tube, sand-precipitating tube, centering ring, bilateral box cupling etc.Pump barrel, pump barrel lengthening tube is fixed on by centering ring and bilateral box cupling in the middle of the sand-precipitating tube of pump, and the annular sand setting space that pump barrel, pump barrel lengthening tube and sand-precipitating tube form is connected with the sand sediment pipe under the pump, composition sand setting passage, and the sand sediment pipe bottom connects plug.Some is on the top of pump barrel when lower dead centre for long-plunger, and the sand on the pump in the liquid sinks in the sand sediment pipe, has avoided that sand setting causes holddown on the pump, and formation fluid enters in the pump from the inlet opening of tap.

This model utility is taken out thick part, is made up of the valve seat that moves about, the valve ball that moves about, lifting sub, rod collar, standing valve, long-plunger, pump barrel etc.Pump is when down stroke, the valve ball that moves about is opened immediately with sucker rod is descending, the phenomenon of when the pressure in the pump chamber equals the oil pipe head of liquid, just having opened when having eliminated the conventional pump down stroke, thereby eliminated valve and opened and closed hysteresis, make that bottom rod string pressurized segment length reduces when descending, improve effective stroke, solved the descending slow problem of sucker rod.

This model utility working principle is: during up stroke, the valve ball that moves about rises immediately with sucker rod and lifting sub, the move about valve ball and the valve seat closure of moving about, upper plug is up to cause the pressure in the pump chamber to reduce, be subjected to the effect of strata pressure, open because of deciding valve, formation fluid enters pump chamber by the inlet opening of bilateral box cupling.During down stroke, the valve ball that moves about is opened immediately with sucker rod is descending, and rod collar promotes guide sleeve, long-plunger is descending, and the pump chamber internal pressure rises, and standing valve is closed, and the formation fluid in the pump chamber drains into oil pipe on the pump.Because there are proportion difference in sand and formation fluid in the pump overlying strata liquid, sand sinks, and piston is when lower dead centre, some is on working barrel, sand is by the hole of centering ring, the annular space that sand-precipitating tube and pump barrel form, and the sand setting passage of bilateral box cupling enters the sand sediment pipe under the extension nipple.The sand control cap is arranged on guide sleeve, prevent that sand from entering long-plunger inside.

Description of drawings:

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

Among the figure 1, end stifled 2, outer tube box cupling 3, rod collar 4, nut 5, sand control cap 6, guide sleeve 7, the valve seat 8 that moves about, the valve ball 9 that moves about, locking nut 10, valve bonnet 11, become that snapping head 12, centering ring 13, sand-precipitating tube 14, long-plunger 15, pump barrel 16, pump barrel lengthening tube 17, guide sub 18, standing valve cover 19, fixed valve base 20, standing valve 21, standing valve are stifled 22, bilateral box cupling 23, extension nipple 24, sand cap 25, lifting sub

Be described in further detail below in conjunction with embodiment.

This pump has comprehensively used such scheme, can reach the sand control card and take out the viscous crude purpose.The sand control holddown has mainly used annular sand setting space and sand control card structure part, removes rod collar, guide sleeve, lifting sub, the valve seat that moves about, the valve ball that moves about, locking nut, valve bonnet, change snapping head on the basis of sand control card thick oil pump.On long-plunger, add the conventional pump guide sleeve and join the sand control cap, add the traveling valve assembly on the top of guide sub.

The action of gravity of sand sediment pipe is on sand-precipitating tube in the utility model, pump barrel is not subjected to axial tension, can reduce the descending resistance of sucker rod, solve the problem of line bend under the descending slow and sucker rod of sucker rod, reduce the generation of rod parting accident, improve effective stroke, can suitably improve the work jig frequency of pumping unit, thus improve oil well the production fluid amount and avoid the sand card.

Claims (2)

1, a kind of oil well tubular type sand control card thick oil pump, mainly by long-plunger 14, short pump barrel 15, sand control cap 5, pump barrel lengthening tube 16, sand-precipitating tube 13, centering ring 12, the bilateral box cupling 22 and the valve seat 7 that moves about, valve ball 8 moves about, lifting sub 25, sucker rod joint hoop 3, standing valve 20 grades are partly formed, it is characterized in that pump barrel 15, pump barrel lengthening tube 16 is fixed in the middle of the sand-precipitating tube 13 of pump by centering ring 12 and bilateral box cupling 22, pump barrel 15, the annular sand setting space that pump barrel lengthening tube 16 and sand-precipitating tube 13 form is connected with the sand sediment pipe under the pump, form the sand setting passage, the sand sediment pipe bottom connects plug.

2, sand control card thick oil pump according to claim 1 is characterized in that taking out thick part and is made up of the valve seat 7 that moves about, the valve ball 8 that moves about, lifting sub 25, rod collar 3, standing valve 20, long-plunger 14, pump barrel 15 etc.

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