Technology Research Of Horizontal Well Sand Washing

In oil field drilling time, the progress of mining technology, using horizontal well technology is more and more places, to the extraction of crude oil has laid a solid foundation. Horizontal well drilling technology can significantly improve the single well production and oil recovery, the scale is expanding fast in recent years.However due to the particularity of horizontal well casing program, with the exploitation of sand is easier to enter the wellbore, the wellbore formation at the bottom of the sand bed may even plug hole, lead to equipment wear and the decline in output. Therefore, horizontal well sand washing and washing effect directly affects the productivity and production cost, horizontal well workover operation difficulty is big, prominent reflected in sand washing process. This is due to the particularity in horizontal well bore structure exists, namely the kick-off section and horizontal section is long, the wellbore axis change is irregular, sand settlement with the movement of crude oil in the wellbore are easy to form new sand bed, under the action of pressure difference at the same time, the sand bed in curing, down into the well of sand control pipe, of solid phased particles into the wellbore is very thin, so the sediment is very stubborn. Horizontal well sand flow has the following characteristics: horizontal section is long arene inflow interface; Direction of fluid flow and sand sedimentation velocity direction vertical; Tsutsui horizontal well trajectory minor fluctuation can lead to sedimentary arene wavy distribution. Sedimentary sand bed is not only a bottom hole fluid flow resistance, can also cause wear to oil production equipment, serious when will affect the normal production of oil Wells, so through hydraulic sand flushing method is often used to remove sedimentary debris in the well.In this paper, and some key technology of horizontal well sand washing technology is studied, and select the use effect of the more conspicuous, a better practical effect of some process for analysis...