CN2295062Y - Oil-pump well oil-adding pump - Google Patents

Abstract

The utility model discloses an oil adding pump for an oil pumping unit well, which belongs to an oil production device which can enhance the pumping efficiency of underground oil pumps and is used by matching with an underground oil pump. The utility model is composed of an oil outlet pup joint, a rubber cylinder assembly, a one-way valve assembly, an oil inlet pup joint, a pump cylinder, etc. When the utility model is used, the plungers of a plurality of oil adding pumps are respectively connected with pumpings rod at different depths, a common oil tube column is used as the pump cylinder which can be driven by a pumping unit to reciprocate, and accordingly, the purpose of pumping can be realized. The utility model has the advantages that the load of a liquid column of an original underground oil pump can be reduced, and the leakage at each position of the pump and the tube column can be decreased, so that the pumping efficiency of the pump can be improved, and the production yield can be increased.

Description

The pumping well oil-adding pump

The utility model relates to a kind of pumping well oil-adding pump that can improve pumping well output, belongs to the oil recovery machiner class.

At present, in the petroleum production at home and abroad, pumping well accounts for the overwhelming majority, and there is a general problem in these oil recovery wells, are exactly that pump efficiency is not high, especially under the darker situation of the oil field of crude oil property complexity and oil well, and embodiment more outstanding.The factor that influences pump efficiency is many-sided, but one of the main reasons wherein is the leakage problem.Leakage comprises three aspects: the gap leaking loss between pump and the plunger, the leakage between valve body and the valve seat and tubing string leakage.All these leakages are all relevant with the pit shaft head of liquid.Oil well is dark more, and the fluid column pressure head is just big more in the pit shaft, and leakage is just serious more.The method that addresses these problems in the prior art is: one, add the increase seal section length of long-plunger, reduce the gap leaking loss amount.Along with the intensification of oil well, plunger needs lengthening pro rata.Two, improve the quality of the valve seat of valve ball, improve its sealing and wear resistance.Three, in connecting, oil string thread adds sealer.These methods all exist very big shortcoming separately.Owing to be subjected to the restriction of existing machinery processing technique level and technological level, the processing of long-plunger is difficulty very.And add long-plunger, and the pump barrel that certainly will extend, the processing of long pump barrel is more difficult.Exceed certain-length, then can't process.The quality of valve ball and valve seat also is difficult to improve a lot because of being subjected to the restriction of material and processing technology.Add sealer in tubing string connects, relate to the site operation job management, it is popularized need very long process.And the common consequence that these ways are brought is: make and make and the installation difficulty increase, cost improves significantly, and effect is not very good.

The purpose of this utility model is to provide a kind of oiling valve, outlet valve that can reduce downhole pump, reaches the leakage of tubing string between plunger and the pump barrel, to improve pump efficiency, increases the downhole oil extraction device of output.

Pumping unit oil-adding pump of the present utility model mainly is made up of pump barrel and plunger two-part.Pump barrel is general oil pipe, in using at the scene, in fact is exactly the oil pipe in the oil well, need not special preparation.Plunger is the groundwork part of pumping well oil-adding pump, is made of fuel-displaced pipe nipple, packing element assembly, one-way valve assembly and oil-feed pipe nipple etc.Design has several oil outlets of radial equipartition and connecting thread up and down on the fuel-displaced pipe nipple.The upper end screw thread is a standard sucker rod screw thread, connects sucker rod when being used for work.The lower end screw thread is common closely-pitched internal thread, links to each other with outside thread on the packing element assembly in the installation.The packing element assembly is by center tube, and rubber tube and upper and lower gland are formed.Center tube is that a upper and lower end is shaped on the externally threaded pipe of closely-pitched, and the intermediate portion is drilled with the pressure transmission hole of net distribution.Rubber tube is made by the oil resistant abrasive rubber, communicate with borehole pressure with center tube sulfuration one and by pressure transmission hole, has good swell-shrinking property, when pumping unit drives the motion of sucker rod up stroke, rubber tube expands under pressure reduction and the oil pipe sealing, pressure reduction disappears during down stroke, and packing element shrinks, thereby guarantees descending smooth.Upper and lower gland is for fixing rubber tube and design.Its internal surface all is shaped on internal thread, during installation, is tightened on the center tube.Be connected with the one-way valve assembly with common fine thread below the packing element.One-way valve is an oiling valve, and oil-feed in the down stroke of pumping unit is closed during upstroke.It is made of valve ball, valve seat and valve bonnet, in order to reach the purpose of standardized designs, all adopts conventional structure.It below the one-way valve oil-feed pipe nipple.The equal car of oil-feed pipe nipple upper and lower end has outside thread, and the upper end screw thread is used for fixing the valve seat of one-way valve, and the lower end screw thread is used for work and connects sucker rod, and uniform oblique slotted hole on several on the circumference of oil-feed pipe nipple is used for pumping unit oil-feed when up.

The pumping well oil-adding pump in use is connected in the different depth of rod string by the hole condition difference.Plungers at different levels become plurality of sections with the packing of oil pipe fluid column during pumping unit work, thereby reduce the leakage that the tubing round thread place produces because of the fluid column load, if with itself and pump footpath less than the supporting use of the downhole pump of pipe aperture, can reduce the leakage of pump valve and pump barrel, thereby improve the pump efficiency of downhole pump greatly.

Pumping well oil-adding pump of the present utility model compared with prior art has the following advantages:

1, can reduce tubing string, the turnover fuel tap of oil well pump and the leakage between plunger and the pump barrel.

2, pump barrel does not need special manufacturing, and is simple in structure, and cost is low.

3, the plunger packing element has bloated, the performance that contracts, and can compensate voluntarily after the wearing and tearing, changes easy.

1 to 2 given embodiment is further described the utility model below in conjunction with accompanying drawing.

Accompanying drawing 1 is the structural drawing of pumping well oil-adding pump

Accompanying drawing 2 is structural drawing of the packing element assembly in the pumping well oil-adding pump

The oil-adding pump nominal diameter is Φ 62mm or Φ 76mm in the pumping unit among the embodiment, can be used in 21/2 inch oil pipe, or in 3 inches oil pipes with CYG-19, sucker rod such as CYG-22 or CYG-25 links to each other, this pump is by fuel-displaced pipe nipple (1), last gland (2), packing element (3), center tube (4), following gland (5), O type circle (6), valve bonnet (7), valve ball (8), valve seat (9), oil-feed pipe nipple (1) and pump barrel compositions such as (11).

Claims (2)

1, a kind of oil-adding pump that is used for the pumping well oil pumping comprises pump barrel and plunger, and it is characterized in that: the pump barrel of this pump is exactly the plain tubing in the oil well, and plunger is made up of the packing element assembly in the middle of the fuel-displaced pipe nipple on top and the individual event valve and the oil-feed pipe nipple of bottom.

2, according to the pumping well oil-adding pump described in the claim 1, it is characterized in that: the packing element assembly in this pump plunger is made up of center tube, rubber tube and upper and lower gland etc., be drilled with the pressure transmission hole of net distribution on the center tube, rubber tube is made by the oil resistant abrasive rubber, rubber tube vulcanizes on center tube, and is fixed by upper and lower gland.

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