CN2833171Y - Feedback type sand-proof thick oil pump - Google Patents

Abstract

The utility model discloses a feedback type sand preventing thick oil pump which belongs to a deep well oil pumping device used in oil fields for the conventional production of thick oil wells or sand containing wells and the steam stimulation exploitation of thick oil wells or sand containing thick oil wells. The utility model is mainly composed of a pump barrel component assembly and a plunger component assembly. A structure with series connection of big and small pumps is adopted, and hydraulic feedback force is arranged in a downward moving process to help a sucker rod to overcome the resistance force of thick oil to move down. Without fixed valves, the thermal production can be realized without moving pipe columns and the automatic oil drainage function is provided when the utility model works. Without oil drainage devices, sand can be washed and flushed positively and reversely without moving pipe columns. A plunger in the utility model has equal diameters, so that sand in raw oil is not easy to enter the plunger and an annular cavity of a pump barrel, the plunger and the pump barrel can be prevented from being pulled by sand to cause sand seizing. A lower oil outlet valve is buried in the inner cavity of an upper plunger, and the defect that sand and foreign matter are easy to accumulate between an oil outlet valve cover and the annular cavity of the pump barrel to pull the pump barrel to cause pump failures.

Description

Sandproof feedback thickened oil pump

Technical field

The utility model relates to a kind of sandproof feedback thickened oil pump that is used for the conventional heavy crude producing well in oil field, cyclic steam stimulation thick oil well and conventional exploitation thickened oil containing sand well, cyclic steam stimulation thickened oil containing sand well pumping crude oil.

Background technique

Existing reaction type suction pump has adopted the form of big or small series connection of pumps, has the hydraulic pressure feedback force at down stroke, and it is descending to help sucker rod to overcome the viscous crude resistance; This pump does not have standing valve, can realize the fixed tubular column thermal recovery, has automatic oil draining function, need not oil drainer, is adapted to conventional heavy crude producing well, cyclic steam stimulation thick oil well.But owing to do not consider the sand control problem, when using in containing the sand oil well, the easily long-pending sand of plunger and pump barrel annular chamber causes holddown; In addition, because outlet valve does not design at plunger cavity down, also very easily long-pending sand of the annular chamber between following oil-release valve cover and the pump barrel and long-pending foreign matter cause holddown, and pump was lost efficacy, and existing reaction type suction pump does not fit into the thickened oil containing sand well.

Summary of the invention

The purpose of this utility model provides a kind of characteristics that kept existing reaction type suction pump, has the sand control function again, can in conventional heavy crude producing well, cyclic steam stimulation thick oil well, use, again the sandproof feedback thickened oil pump that can in containing the conventional heavy crude producing well of sand, cyclic steam stimulation thick oil well, use.

The purpose of this utility model is achieved in that a kind of sandproof feedback thickened oil pump, comprise pump barrel modular assembly and plunger assembly assembly, last pump barrel 3 in the pump barrel spare assembly is connected with pump barrel box cupling 1, following pump barrel 11 is connected with following pump barrel box cupling 13, be connected by polyphone box cupling 9 between last pump barrel 3 and the following pump barrel 11, following pump barrel 11 internal diameters are isometrical; Upper plug 4 is installed in the pump barrel 3 in the plunger assembly assembly, lower plunger 10 is installed in down in the pump barrel 11, upper plug 4 is isometrical plunger, and its upper end is a male thread, is connected with last outlet valve 2, upper plug 4 lower ends are internal thread, be connected with fuel-displaced 6 of centre, middle fuel-displaced 6 is connected with oiling valve 7, and following outlet valve 5 is positioned at upper plug 4 lower end inner chambers, lengthening joint 8 in the middle of being provided with between upper plug 4 and the lower plunger 10, middle lengthening joint 8 is connected with oiling valve 7.Upper plug 4 keeps sharp with last pump barrel 3 fitting surface two ends.Following pump barrel 11 inner chamber two ends oral areas keep sharp.Outlet valve 7 is equipped with backing-up screw 14 with oiling valve 7 threaded connection places, oiling valve 7 with every place, middle lengthening joint 8 threaded connection places with middle delivery connection 6 threaded connection places, middle delivery connection 6 with upper plug 4 threaded connection places, upper plug 4.

Sandproof feedback thickened oil pump provided by the utility model is provided with the last outlet valve of upper plug upper end and the following outlet valve two cover outlet valves that are embedded in upper plug lower end inner chamber, has improved the reliability and the pump efficiency of pump; The upper plug upper end is a male thread, directly is connected with last outlet valve, has reduced by a discharge outlet, has reduced manufacture cost, the sand card drawback of also having avoided discharge outlet and tube annular space to cause simultaneously; The upper plug external diameter is isometrical, can prevent that sand enters pump barrel in the crude oil, avoids the sand card; The upper plug two ends keep sharp simultaneously, can effectively strike off the dirts such as sand that adhere on the pump barrel; Following outlet valve is embedded in upper plug lower end inner chamber, compare with existing pump, reduced time oil-release valve cover, structure is simpler, and manufacture cost is lower, and reduce the clearance of pump, improved pump efficiency, main is to have avoided the long-pending sand of time oil-release valve cover and pump barrel gap, long-pending foreign matter, pulls plunger and pump barrel, finally cause the sand card, the drawback that pump was lost efficacy.Following pump barrel internal diameter is isometrical, can prevent that sand from entering down in the pump barrel, avoids the sand card; It is sharp that inner chamber two ends oral area keeps, and can effectively strike off the dirts such as sand that adhere on the lower plunger.Outlet valve and upper plug threaded connection place, upper plug and middle delivery connection threaded connection place, middle fuel-displaced head are equipped with backing-up screw with oiling valve threaded connection place, the every place of oiling valve and middle lengthening joint threaded connection place, can effectively avoid thread stripping, release and thread off, improve the reliability that oil pump thread connects greatly, prolonged the working life of oil well pump.

Description of drawings

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.

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

Fig. 2 is a backing-up screw assembling section partial enlarged drawing.

Fig. 3 is the assembling section of upper and lower outlet valve and upper plug.

Embodiment

The working principle of this device is: during up stroke, plunger assembly is up under the drive of pumping unit by sucker rod, last pump barrel 3 becomes big with lower plunger 10 annular chamber volumes, the pump chamber internal pressure reduces, 2 times outlet valves 5 of last outlet valve cut out under the effect of fluid column, oiling valve 7 is opened, and liquid enters pump barrel 3 and lower plunger 10 annular chambers through guide sub 12, lower plunger 10, middle lengthening joint 8, oiling valve 7, middle delivery connection 6 in the oil well; Simultaneously, upper plug 4 above liquid drain into ground installation by oil pipe.During down stroke, plunger assembly is descending, and last pump barrel 3 diminishes with lower plunger 10 annular chamber volumes, and the pump chamber internal pressure increases, outlet valve is opened, and last pump barrel 3 is discharged in the oil pipe by middle delivery connection 6, time outlet valve 5, upper plug 4, last outlet valve 2 with lower plunger 10 annular intracavity liquids; Oiling valve cuts out, because sectional area of plunger difference up and down, therefore, the pressure difference of fluid column and pump intake pressure produces a downward pulling force to rod string, make rod string be in tension state all the time in whole descending process, it is descending to help rod string to overcome descending resistance.

Claims (4)

1, a kind of sandproof feedback thickened oil pump, comprise pump barrel modular assembly and plunger assembly assembly, it is characterized in that: the last pump barrel (3) in the pump barrel modular assembly is connected with pump barrel box cupling (1), following pump barrel (11) is connected with following pump barrel box cupling (13), be connected by polyphone box cupling (9) between last pump barrel (3) and the following pump barrel (11), following pump barrel (11) internal diameter is isometrical; Upper plug in the plunger assembly assembly (4) is installed in the pump barrel (3), lower plunger (10) is installed in down in the pump barrel (11), upper plug (4) is isometrical plunger, its upper end is a male thread, be connected with last outlet valve (2), upper plug (4) lower end is an internal thread, be connected with the fuel-displaced head in centre (6), middle fuel-displaced head (6) is connected with oiling valve (7), following outlet valve (5) is positioned at upper plug (4) lower end inner chamber, lengthening joint (8) in the middle of being provided with between upper plug (4) and the lower plunger (10), middle lengthening joint (8) is connected with oiling valve (7).

2, sandproof feedback thickened oil pump according to claim 1 is characterized in that: upper plug (4) keeps sharp with last pump barrel (3) fitting surface two ends.

3, sandproof feedback thickened oil pump according to claim 1 is characterized in that: following pump barrel (11) inner chamber two ends oral area keeps sharp.

4, according to claim 1 or 2 or 3 described sandproof feedback thickened oil pumps, it is characterized in that: outlet valve (7) is equipped with backing-up screw (14) with oiling valve (7) threaded connection place, oiling valve (7) with every place, middle lengthening joint (8) threaded connection place with middle delivery connection (6) threaded connection place, middle delivery connection (6) with upper plug (4) threaded connection place, upper plug (4).