SU832118A1

SU832118A1 - Well sucker rod pump

Info

Publication number: SU832118A1
Application number: SU792780001A
Authority: SU
Inventors: Георгий Агалумович Айрапетов; Габиб Гасан Оглы Джабаров; Александр Михайлович Пирвердян; Энвер Мисир Оглы Рустамов
Priority date: 1979-07-05
Filing date: 1979-07-05
Publication date: 1981-05-23

Description

Изобретение относится к гидромашиностроению, в частности к скважинным штанговым насосам для добычи нефти.The invention relates to hydraulic engineering, in particular to downhole sucker rod pumps for oil production.

Известен скважинный штанговый на- * сос, содержащий цилиндр с полым дифференциальным плунжером, меньшая ступень' которого образует с цилиндром кольцевую полость, сообщаемую с затрубным пространством, и снабжена всасывающим клапаном, а также нагнетательный клапан р.}.A well-known sucker-rod pump is known, comprising a cylinder with a hollow differential plunger, the lower stage of which forms an annular cavity communicating with the annulus with the cylinder and is equipped with a suction valve and also a discharge valve p.}.

Недостаток насоса состоит в его ненадежности и большой металлоемкости колонны штанг с использовани- 15 ем тяжелого низа из-за их продольного изгиба при ходе дифференциального плунжера вниз.The disadvantage of the pump is its unreliability and the high metal consumption of the rod string using a heavy bottom due to their longitudinal bending during the course of the differential plunger down.

Цель изобретения - повышение надежности скважинного штангового на- 20 coca и снижение металлоемкости колонны штанг путем устранения их продольного изгиба при ходе дифференциального плунжера вниз.The purpose of the invention is to increase the reliability of a borehole 20 coca rod and reduce the metal consumption of the rod string by eliminating their longitudinal bending during the course of the differential plunger down.

Указанная цель достигается тем, 25 что меньшая ступень последнего в зоне кольцевой полости снабжена сквозными радиальными каналами для сообщения кольцевой полости с полостью упомянутой меньшей ступени плунжера. ,30This goal is achieved by the fact that a smaller stage of the latter in the zone of the annular cavity is provided with through radial channels for communicating the annular cavity with the cavity of the said lower stage of the plunger. ,thirty

На чертеже схематично представлен скважинный штанговый насос.The drawing schematically shows a borehole sucker rod pump.

Насос содержит цилиндр 1 с расположенным в нем полым .дифференциальным плунжером 2, меньшая ступень 3 которого образует с цилиндром 1 кольцевую полость 4, сообщаемую с затрубным пространством (не показано), и снабжена всасывающим клапаном 5, установленным на нижнем конце меньшей ступени 3 дифференциального плунжера 2, а также нагнетательный клапан 6, расположенный со стороны верхнего конца большей ступени 7 дифференциального плунжера 2. Меньшая ступень 3 дифференциального плунжера 2 в эоне кольцевой полости 4 снабжена сквозными радиальными каналами 8 для сообщения кольцевой полости 4 с полостью 9 упомянутой меньшей ступени 3 плунжера. Цилиндр 1 в нижней своей части снабжен сальниковым.цилиндром 10 для взаимодействия со ступенью 3 плунжера 2.Плунжер 2 связан с колонной насосных-штанг 11.The pump contains a cylinder 1 with a hollow differential plunger 2 located in it, the lower stage 3 of which forms an annular cavity 4 with cylinder 1, which communicates with the annulus (not shown), and is equipped with a suction valve 5 mounted on the lower end of the lower stage 3 of the differential plunger 2, as well as the discharge valve 6, located on the upper end side of the larger stage 7 of the differential plunger 2. The smaller stage 3 of the differential plunger 2 in the aeon of the annular cavity 4 is provided with through radial channels alami 8 for communication of the annular cavity 4 with the cavity 9 of the aforementioned lower stage 3 of the plunger. The cylinder 1 in its lower part is equipped with a stuffing box. The cylinder 10 for interaction with the stage 3 of the plunger 2. The plunger 2 is connected with the column of pump rods 11.

Скважинный штанговый насос работает следующим образом.Downhole sucker rod pump operates as follows.

При ходе дифференциального плунжера 2 вверх объем кольцевой полости 4 увеличивается и в нее через открывшийся всасывающий клапан 5, полость 9 меньшей ступени 3 плунжера 2 и сквозные радиальные каналы 8 поступает скважинная жидкость,т.е. кольцевая полость 4 сообщается с затрубным пространством.During the course of the differential plunger 2 upward, the volume of the annular cavity 4 increases and borehole fluid enters through the opened suction valve 5, cavity 9 of the lower stage 3 of the plunger 2 and through radial channels 8, i.e. the annular cavity 4 communicates with the annulus.

При ходе дифференциального плунжера 2 вниз давление в кольцевой полости 4 повышается, всасывающий кла- . пан 5, установленный на нижнем кон- ¹це полой меньшей ступени 3 цлунжера, закрывается, а нагнетательный кла-пан 6, расположенный на верхнем конце полой большей ступени 7, открывается и жидкость из кольцевой полости 15 4 переходит в полость над большей ступенью 7 плунжера 2, при этом весь столб жидкости давит на всасывающий клапан. Тем самым обеспечивается появление растягивающей силы, 20 равной весу столба жидкости высотой от насоса до устья скважины (не показано) и основанием, равным площади отверстия полости 9 меньшей ступени 3 плунжера 2. 25When the differential plunger 2 moves downward, the pressure in the annular cavity 4 rises, the suction valve -. the pan 5 installed on the lower end of the ¹ hollow smaller stage 3 of the plunger closes, and the discharge valve 6, located on the upper end of the hollow larger stage 7, opens and fluid from the annular cavity 15 4 passes into the cavity above the larger stage 7 of the plunger 2, while the entire column of liquid presses on the suction valve. This ensures the appearance of a tensile force 20 equal to the weight of a liquid column with a height from the pump to the wellhead (not shown) and a base equal to the area of the opening of the cavity 9 of the lower stage 3 of plunger 2. 25

Растягивающая сила больше сил сопротивления и в связи с этим отпадает необходимость в применении тяжелого.низа для предотвраще— ния продольного изгиба штанг и вызываемых им отворотов и полома .³ штанг. Кроме того, отсутствие тяжелого низа, в качестве которого обычно применяются штанги большого диаметра, приводит к снижению расхода металла и снижению резки на балансир. Также сокращаются простои скважин на ремонт, что, в свою очередь, приводит к увеличению количества добытой нефти.The tensile force is greater than the resistance forces and in this connection there is no need to use a heavy lower to prevent longitudinal bending of the rods and the lapels and breakage caused by it. ³ bars In addition, the absence of a heavy bottom, which is usually used with large-diameter rods, leads to a decrease in metal consumption and a reduction in cutting to a balancer. Well downtime for repairs is also reduced, which, in turn, leads to an increase in the amount of oil produced.

Claims

This invention relates to a hydraulic engineering industry, in particular to well sucker-rod pumps for oil production. A well bore rod on a pump is known that contains a cylinder with a hollow differential piston plug, a smaller stump of which forms an annular cavity with the cylinder, communicating with the annulus, and is equipped with a pressure valve 1. The disadvantage of the pump is its unreliability and large metal capacity rods using a heavy bottom due to their longitudinal bending during the course of the differential plunger down. . The purpose of the invention is to improve the reliability of the well sucker rod coca and reduce the metal intensity of the rod string by eliminating their buckling during the differential plunger down. This goal is achieved by the fact that a smaller stage of the latter in the zone of the annular cavity is provided with through radial channels for communicating the annular cavity with the cavity of the lesser plunger stage. The drawing schematically shows a well pump. The pump contains a cylinder 1 with a hollow differential plunger 2 located in it, the smaller stage 3 of which forms with the cylinder 1 an annular cavity 4 communicated with the annulus (not shown) and is equipped with a suction valve 5 installed at the lower end of the lower stage 3 of the differential plunger 2 as well as the discharge valve 6, located on the upper end of the larger stage 7 of the differential plunger 2. The lower stage 3 of the differential plunger 2 in the area of the annular cavity 4 is provided with radial through holes 8 W channels for communicating the annular space 4 with a cavity of said plunger at stage 3. The cylinder 1 in its lower part is equipped with a gland cylinder 10 for interacting with the stage 3 of the plunger 2. The plunger 2 is connected with the column of pumping rods 11. The borehole sucker-rod pump works as follows. During the course of the differential plunger 2 upward, the volume of the annular cavity 4 increases and after it opens: the suction valve 5, the cavity 9 of the smaller stage 3 of the plunger 2 and the through radial channels 8 receive well fluid, i.e. annular cavity 4 communicates with annulus. During the course of the differential plunger 2 downward, the pressure in the annular cavity 4 rises, the suction valve 5 installed at the lower end of the hollow lower stage 3 of the valve is closed, and the discharge valve 6 located at the upper end of the hollow greater stage 7 opens with the fluid from the annular cavity 4 passes into the cavity above the larger stage 7 of the plunger 2, while the entire liquid column presses on the suction valve. It is thus ensured that a force is stretched equal to the weight of the liquid column with a height from the pump to the wellhead (not shown) and a base equal to the opening area of the cavity 9 of the lesser plunger stage 3

2. The tensile force is greater than the resistance force and, therefore, there is no need to apply heavy weight to prevent buckling of the rods and the cuffs caused by it and the rods breaking. In addition, the absence of a heavy bottom, of which large diameter rods are commonly used, leads to a reduction in metal consumption and a reduction in cutting to the balance bar. Also, downtime for repair is scaled down, which in turn leads to an increase in the amount of oil produced. Invention Formula A borehole sucker-rod pump comprising a cylinder with a hollow differential plunger, a smaller stage of which forms with the cylinder an annular cavity communicated with the annulus and is equipped with a suction valve, as well as a discharge valve, characterized in that, in order to increase its reliability and reduce metal consumption the rods of the rods by eliminating their buckling during the course of the differential plunger vtsiz, the lower degree of the latter in the zone of the annular cavity is provided with through radial channels lamines for communicating the annular cavity with the cavity of the lesser plunger stage. Sources of information taken into account in the examination 1. USSR author's certificate №77886, cl. F 04 B 47/02, 1948.