CN101403392A

CN101403392A - Balancing device of down-hole multiphase mixed extraction pump

Info

Publication number: CN101403392A
Application number: CNA2008101599486A
Authority: CN
Inventors: 李增亮; 高扬; 张瑞霞; 李风涛; 李虎; 陈猛
Original assignee: China University of Petroleum East China
Current assignee: China University of Petroleum East China
Priority date: 2008-11-08
Filing date: 2008-11-08
Publication date: 2009-04-08

Abstract

The invention belongs to the mechanical oil extraction technology field in the oil and gas field development project and relates to a balance device design of an underground multi-phase mixed extraction pump. The device is characterized in that 85 percent-95 percent of the axial force can be balanced by a balancing drum and the rest of the axial force can be balanced by a bearing. The axial gap of the balancing drum and a cross channel is a cone-shaped structure with a small entrance and large exit and can prevent from being obstructed by sand flowing through the gap; a sand filtration device can lead most of the sand to be removed from a main channel; blades in the back cavity of the balancing drum can prevent the gathering of the sand; a ring-shaped gad which is formed by the surrounding of an inner sleeve, the cross channel and an outer sleeve leads the back cavity of the balancing drum and the pump entrance to be communicated, thereby playing the role of balancing pipes, and leads the fluid which flows through the balancing drum to return to the pump entrance, thereby ensuring the normal work of the balancing drum.

Description

Balancing device of down-hole multiphase mixed extraction pump

Technical field

The invention belongs to the down-hole mechanical oil recovery technique field in the Oil-Gas Field Development Engineering.

Background technique

Along with the exploitation of a large amount of high gassiness oil wells, the conventional mechanical oil production method can not satisfy on-the-spot complicated working condition requirement, and process for petroleum recovery is badly in need of innovation.Screw axis streaming multiphase pump mixes defeated, simple and compact for structure with its big flow, high gassiness and to the very suitable modern Oilfield developing requirement of the insensitive characteristics of sand grains.But the axial force of screw axis streaming multiphase pump is bigger, has greatly influenced the operating life of pump.Traditional axial force balance mode, as use a large amount of thrust bearings and friction ring, not only greatly reduce the mechanical efficiency of multi-phase mixed pump, also increased the production and the maintenance cost of pump, a lot of difficulties are also brought for the balance of multi-phase mixed pump in limited space, down-hole simultaneously.Applying of down-hole multiphase mixed extraction pump is subjected to very big influence.

Summary of the invention

The present invention is a kind of Equilibrator of down-hole multiphase mixed extraction pump, and this Equilibrator can balance 85%---95% axial force, and the residue axial force is by the bearing balance.

The present invention mainly contains spline housing (1), inlet attack (2), bearing support (3), (17), bearing (4), (18), inlet sleeve (5), flow deflecting cone (6), impeller (7), guide wheel (8), pump shaft (9), outer sleeve (10), inner sleeve (11), filter sand device (12), balancing drum (13), cross-channel (14), gland nut (15), outlet connection (16), compositions such as axle sleeve (20), (23), (24).Filter sand net (22) is wherein arranged above the filter sand device, the most sands in the fluid are flowed out by sprue; Axial clearance between balancing drum and the cross-channel is taper, the sand in the gap of flowing through is all flowed out, and can not block balancing drum axial clearance; Balancing drum back cavity (19) has 4-6 blade, and the sand in the chamber is had agitaion, prevents that sand from assembling at back cavity; The annular space that surrounds between inner sleeve, cross-channel and the outer sleeve is communicated with pump intake (25) and balancing drum back cavity, plays the effect of balance tube, guarantees that shunting can encircle through-flow moving through the fluid of balancing drum.

Description of drawings

Accompanying drawing is the one-level screw axis streaming multi-phase mixed pump structure diagram of this invention.

Embodiment

Fluid enters multi-phase mixed pump by inlet attack, form high-pressure liquid through impeller and guide wheel pressurization back, thereby form big pressure reduction in the forward and backward both sides of impeller and guide wheel, add fluid, produced axial force under three's acting in conjunction the impact of blade and the gravity of impeller self.High-pressure liquid is through the filter sand device, and most sands flow to delivery side of pump in company with fluid through the cross-channel sprue; Enter balancing drum ante-chamber (21) behind the small volume of fluid process filter sand net filtration, arrive balancing drum back cavity (19) through the axial clearance between balancing drum and the cross-channel, axial clearance is the cone structure that import is little, outlet is big, the sand that does not filter out is passed through smoothly, prevent that axial clearance is blocked; The balancing drum back cavity has 4-6 blade, can play stirring action by convection cell when rotating with axle, prevents that sand from assembling at back cavity; The fluid of back cavity enters the annular space that inner sleeve, cross-channel and outer sleeve surround through the aperture of cross-channel, flows back to the pump intake place at last, forms the ring passage flow duct.Because the balancing drum ante-chamber is full of the liquid through pressurization, is the zone of high pressure; The balancing drum back cavity communicates by ring runner with pump intake, be low pressure area, power and the mutual balance of most of axial force that the pressure reduction at balancing drum two ends produces, reduced axial force greatly, thereby reduced the apolegamy difficulty of bearing, increased the operating life of pump, made down-hole multiphase mixed extraction pump operation steady in a long-term become possibility.

Claims

The present invention is a kind of Equilibrator of down-hole multiphase mixed extraction pump, it is characterized in that:

1), the ring runner that surrounds of interior pump barrel, cross-channel and outer pump barrel is communicated with balancing drum back cavity and pump intake, plays the effect of balance tube.

2), the axial clearance between balancing drum and the cross-channel is into cone structure young, that outlet is big, the sand in the gap that can prevent to flow through blocks runner.

3), the filter sand net is arranged on the filter sand device, most sands are flowed out from the sprue of cross-channel, prevent that balancing drum axial clearance from being blocked by the entrained sand of fluid.

4), the balancing drum back cavity has 4-6 blade, can play stirring action to a small amount of sand in the chamber, prevents that sand from assembling at the balancing drum back cavity.