Long-Term Sand Control Technology for Multiple Round Steam Huff and Puff Wells in Heavy Oil Reservoirs

In order to prolong sand control validity for steam huff and puff wells in heavy oil reservoirs,sand control tools,compaction material and packing technology were studied.Long-acting sand control tool was developed with filling head repeatable switch and modified sealing element material;high temperature resistant coated proppant with high strength was developed and multi stage packing was adopted in injection.These combined measures form the long-term sand control technology for multiple round steam huff and puff wells in heavy oil reservoirs.The sealing element of long-acting sand control tool can meet production requirements of multiple round steam huff and puff wells,whose compression deformation is less than 55%,extension strength reaches 8.9 MPa and the elongation at break is 102% after four rounds huff and puff experiments.High temperature resistant coated proppant can resist high temperature up to 300 ℃,having a consolidation strength of 7.1 MPa and permeability of 96 Darcy after four rounds of steam huff and puff,which fully meets the requirements of steam huff and puff production.Multistage packing technology reduces cost and post-processing difficulty.The long-term sand control technology for multiple round steam huff and puff wells in heavy oil reservoirs has been applied in 11 wells in Shengli Oilfield,and the average valid sand control time is 930 days,which meets sand control requirements of multiple round steam huff and puff wells.