Patent ID: 6298918
Filing Date: 2001-10-09
Classification: E21B

Abstract:
A system for lifting petroleum by pneumatic pumping for increasing the production of petroleum wells having well casings and well bottoms and improving the level of utilization of the oil in the reservoir, characterized in that the apparatus comprises:first and second columns along the depth of the well, said first column having a diameter greater than that of the second column; said first column surrounding the second column, and said second column serving as production column for the well; said first and second columns delimiting between them an annular space where pressurized gas is injected; said first column having upper and lower portions with said lower portion of larger diameter than said upper portion and forming a storage chamber for fluid,a one-way valve to said storage chamber;a one-way valve to said second column;means for supporting said first and second columns;first gas injection means for the injection of gas to said annular space;a control system operating to control said gas injection;a gas supply source,and inside the production column:an auxiliary lift tube,means for supporting the auxiliary lift tube, andsecond gas injection means for auxiliary injection of gas into the annular space between said second column and said auxiliary lift tube.