Abstract: An apparatus for pumping fluid, the apparatus including a pump housing including a plunger connected to a terminal end of a coiled tubing and a first port. The apparatus further including the plunger configured to move longitudinally upward and downward, wherein the plunger includes a second port and a surface pumping unit configured to modulate between two modes, a first mode configured to limit a stroke length of the plunger so that the first and second ports do not engage, and a second mode wherein the first and second ports engage. Also, a method for pumping fluid into a wellbore using an apparatus, the method comprising inserting a housing including a coiled tubing and a plunger into the wellbore, wherein the plunger is located at a terminal end of the coiled tubing, and wherein the housing includes a first port and a plunger includes a second port.

Abstract: A pumping apparatus including a pump housing, a plunger operatively coupled to a terminal end of a production string and configured to move upward and downward within the pump housing, a surface pumping unit operatively connected to an upper end of the production string, and at least one element of incremental resistance disposed on an inner surface of the pump housing or an outer surface of the plunger proximate an upper or lower limit of a pump stroke is disclosed. A method for pumping fluid from a wellbore using a pumping system having an element of incremental resistance disposed near at least one of an upper end of a pump stroke and a lower end of a pump stroke to increase the axial load is also disclosed.

Abstract: A dual displacement pumping system is disclosed. In one embodiment, the system includes a subsurface pump, a tubing string, and a surface pumping unit connected to the subsurface pump by a reciprocating member. The subsurface pump includes a pump barrel mounted to the end of the tubing string, and a plunger mounted to the end of the reciprocating member. Valves cause downward motion of the plunger in the pump barrel to force fluid from the lower end of the pump barrel into the reciprocating member, and fill the upper end of the pump barrel with well bore fluid. They also cause upward motion of the plunger to force fluid from the upper pump barrel into the tubing string, and fill the lower pump barrel with well bore fluid. Thus, both pumping movements are exploited, nearly doubling the volume of fluid pumped with a conventional surface configuration.

Abstract: A dual displacement pumping system is disclosed. In one embodiment, the system includes a subsurface pump, a tubing string, and a surface pumping unit connected to the subsurface pump by a reciprocating member. The subsurface pump includes a pump barrel mounted to the end of the tubing string, and a plunger mounted to the end of the reciprocating member. Valves cause downward motion of the plunger in the pump barrel to force fluid from the lower end of the pump barrel into the reciprocating member, and fill the upper end of the pump barrel with well bore fluid. They also cause upward motion of the plunger to force fluid from the upper pump barrel into the tubing string, and fill the lower pump barrel with well bore fluid. Thus, both pumping movements are exploited, nearly doubling the volume of fluid pumped with a conventional surface configuration.

Abstract: Accordingly, an improved pumping system is herein disclosed. In one embodiment, the pumping system includes a subsurface pump, a tubing string, and a surface pumping unit. The subsurface pump is anchored downhole and driven by repeated upward and downward motion of the tubing string. The subsurface pump pumps fluids to the surface via the tubing string. The upward and downward motion of the tubing string is imparted by any suitable surface pumping unit such as, e.g. a beam pumping unit or a hydraulic pumping unit. This pumping system advantageously provides for a minimal number of strings downhole, requiring at most only (1) casing and (2) the production tubing. Accordingly, the well may be drilled using a very slender hole, thereby allowing for sharply reduced drilling and production costs.

Abstract: Accordingly, an improved pumping system is herein disclosed. In one embodiment, the pumping system includes a subsurface pump, a tubing string, and a surface pumping unit. The subsurface pump is anchored downhole and driven by repeated upward and downward motion of the tubing string. The subsurface pump pumps fluids to the surface via the tubing string. The upward and downward motion of the tubing string is imparted by any suitable surface pumping unit such as, e.g. a beam pumping unit or a hydraulic pumping unit. This pumping system advantageously provides for a minimal number of strings downhole, requiring at most only (1) casing and (2) the production tubing. Accordingly, the well may be drilled using a very slender hole, thereby allowing for sharply reduced drilling and production costs.

Abstract: A pump apparatus for use in a pump system of a well capable of exerting and releasing pressure on a pump fluid supplied to the pump apparatus. The pump apparatus includes a tubular body having a pump fluid space for communicating with the pump fluid and a chamber for receiving unpumped well fluid and for furnishing pumped well fluid to a wellhead of the well, wherein the pump fluid and the pumped well fluid remain separated. The pump apparatus includes a device located inside the tubular body and in contact with the pump fluid space for displacing the pumped well fluid from the chamber to the wellhead in response to the pump system exerting pressure on the pump fluid and for receiving the unpumped well fluid from a producing formation and delivering the unpumped well fluid to the chamber in response to the pump system releasing pressure on the pump fluid.