Borewell Pumps

We are offering borewell pumps
ping unit csrm (with crank-sheave reformative mechanism) are used for driving gear are used of dipping sucker-rod pump in spooling formation water from degassing borehole, which are bored from a ground surface to a coal-bed to make methane recovery.
water pilling is made by volumetric dipping sucker-rod pump, downed to borehole, while the driving gear which provides back-and-forth motion of pump piston is pumping unit installed at the surface.
pumping unit is designed for reforming angular motion electric motor into back-and-forth motion of cross-arm and further through fishing string downed to borehole transfer the motion to pump piston.
The given method of water spilling from degassing boreholes is the most economical and widely used. The economic indexes are less than running costs for a pumping unit which are on their part depend on perfection of construction of a pumping unit.
Beamless pumping units csrm have original construction of crank-sheave reformative with v –like placing of cable branches due to which swinging rocking shaft and flipover cartridge are absent, which allowed to decrease in many times the dynamic force, provide a high degree of balancing and complete absence of negative rotational moments on reduction gear which puts forward the following advantages of beamless pumping units csrm in comparison with other kinds of oil-production equipment:
:
1. Reduction of electric energy consumption by 15-29%.
2. Increase of exploitation life of reduction gear achieved by absence of negative rotational moment on output shaft
3. Increase of exploitation life of bar columns as there almost no dynamic force and vibration.
4. Increase of delivery rate due to the increased stroke length which compensates drawing out of bar columns.
5. Increase of efficiency of pump by reduction of the number of pumpings and thus the number of abrasions of ball clack each of which is accompanied by leakage of formation liquid.
6. Increase of exploitation life of a sucker-rod pump as the increase of the length of the pumping travel means ïðåäïîëàãàåò elongated cylinder, which greatly lowers deterioration of its work surface.
7. Reduction in the expenditures with the installation for trade, since the volume of foundation csrm is 5 times less in the comparison with other types of pumping-units.
below table gives basic technical specifications of machine tool- rockers csrm.
Kinematics of crank-sheave reformative mechanism of driving gear of csrm
crank-sheave reformative mechanism oil pumping unit jack oilfield equipment 1- post (triple)
2- driving crankshaft
3- belt idler
4- guide pulley
5- flexible link (cable)
6- running cross-arm
а - anchorage point of motionless cable end 5
g – angle between v-like situated cable branches 5
q – offset angle
s0 - stroke length of the running cross-arm (max)
driving gear is designed to give a piston of borehole pump back-and-forth motion by a column of pumping rods.
the distinctive feature of beamless crank-sheave driving gear of csrm is an original construction of the mechanism which reforms angular motion of crankshafts installed on the driven shaft reduction gear in back-and-forth motion of the running cross-arm which is the final control element of the driving gear.
the essence of this reformative mechanism is following: crankshafts 2 are provided with belt idler 3 ñ with circumflex cables 5, lower ends of which articulately joined to post 1 (frame) in point à, and to the upper placed through the guide pulleys 4, situated in the upper part of the post 1 (boom), running cross-arm 6 is suspended. At the same time cable branches outgoing from belt idlers are situated v-like (angle g). Peculiarity of this reformative mechanism is also the following: it is able, unlike other crankshaft mechanism with a flexible link, under certain geometrical correlation of links to generate back-and-forth motion with asymmetric ñ àñèììåòðè÷íûì (offset) cycle.
this driving gear works as follows. Crankshafts 2, making angular motion in direction marked by an arrow, influence bending cables 5 with their belt idlers 3. As one part of these cables are fastened motionless the other part thrown over idlers together with running cross-arm 6 make back-and-forth motion, putting in action by bar columns, borehole pump placed in depth. At the same time g-angle between v-like situated cable branches in every cycle of work of the driving gear changes its value from bigger to smaller when running cross-arm moves upstairs and vice versa – from smaller to bigger when the running cross-arm moves .
such change of the angle between v- like situated cable branches and presence of optimal offset positively influence the character of the rotational moment on the crankshaft, created by the borehole work which forces on the running cross-arm of the driving gear thus approaching the law of changing of this rotational moment to the sinusoidal one, which yields to its fuller balancing by its crankshaft balancing which changes in a cycle strictly by sinusoid. As a result the residual rotational moment, perceptible by the reduction gear in the driving gear of csrm under other equal conditions, gets lower more than by a quarter and in many cases by one third not only in comparison with beamless crank driving gear of sbm type but in a greater degree in comparison with the standard beam-pumping units.
From all things above said it follows that specific stroke length brought to every khm of the rotating moment in the driving gears of csrm under other equal conditions is approximately 1.5 times bigger that in the standard beam-pumping units.
This and also compactness of crank-sheave reformative mechanism permits at the same power to realize long stroke driving gear of csrm type with a stroke length up to 6 ì, and at the same time horizontal clearances of these units are not over horizontal clearances of the beam-pumping units with a stroke length 1,5 times smaller.
Considerable reduction and levelling of the rotating moment on the reduction gear, absence of the negative values lead to the essential reduction of effective power of electric motor and simultaneous increase of efficiency and cos j of its work
oilfield equipment
with the same loading on the reduction gear and identical pump speed (i.e. . In producing sn=const) driving gears of csrm, which have a considerably longer stroke length, consume approximately 1,5 times less electric power than the standard beam-pumping units, and at the same time 30-35% electric power economy is achieved by the perfection of the driving gear which allows to provide a higher degree of balancing and 1-15% - ue to increase of the stroke length which increases the volumetric efficiency of the pumping facility and reuces dynamic constituent in a borehole work. The given data are proven to be true by the metering in the oil fields.
1,5 times increase of the stroke length with the simultaneous reduction of the strokes number and keeping ump performance at the same volume, increases in 1.7 times the service life of bars as due to the reduction of the number of loading cycles at a unit time, so due to the reduction of the reduced voltage in the bars.
Increase of the stroke length and reduction of the number of the working cycles of work of the pumping unit also leads to the increase of the service life of the borehole pump.
Possibility to create high rotating moments on the rod rotor with no danger of the curling of the suspension bracket of the bars excludes the reverse of the bars and provides equal deterioration which increases their service life.
Increase of the stroke length provides conditions for use of the glass-fibre-reinforced plastic bars and polymeric tubings in deep boreholes, and low-speed pumping conditions permits to pump out extra-heavy crude oil more effectively.
the driving gear has high manufacturability of regulation and service, including:
- mechanized boom pipe-bend from well head, in need of making underground well repair, the pipe-bend size is over 1 m;
- momentary pipe-bend braking and following momentary plugging, including safe work in service of the mechanisms;
- convenient access to the mechanism of wedge belts tension;
- the change of stroke length (belt idler transposition), transposition of counterbalances is perfomed with the help of devices in the supply.
for the installation of the driving gears compact and high foundation is not required which hastens and makes the installation work cheaper and the very driving gears are less sensitive to à differential settlement.
Considerably smaller overall dimensions in comparison to other crankshaft driving gears permit to rationally use csrm in narrow conditions of sea oil grounds and when wells are in grouping.
below is the nomenclature of csrm driving gears which are able to provide liquid lifting under any service conditions and under the lowest power costs and the longest overhaul period of work in comparison to other crankshaft driving gears.
Nomenclature and brief performance attributes of csrm crank-sheave driving gears of the well sucker-rod pump.
beamless pumping jack, oil well production equipment