Research and application of self source closed enhanced water injection technology for low permeability and high temperature deep reservoirs in the Paleogene of Lufeng oilfield
Efficient water injection development of low permeability and high temperature deep reservoirs in the Paleogene of Lufeng oilfield is facing challenges due to limitations such as offshore platform space,operational costs,water injection sources,and construction techniques.In this study,a feasibility analysis of water injection using the Paleogene reservoir test well in Lufeng oilfield is conducted as an example.The most suitable water sources and injection layers are selected based on our analysis.The self source closed water injection is used to supplement formation energy with self-source water layers in the same well.A supporting water distributor has been developed to meet the performance requirements of regulating torque less than 5 N·m and pressure difference of 35 MPa.The measuring and adjusting instrument can withstand temperatures up to 175 ℃ and pressures up to 60 MPa.A new method of water injection has been implemented for offshore platforms with multiple deep wells,eliminating the need for surface equipment.The explosive fracturing process using cable transmission is adopted to achieve fast and efficient operation.The duration of the measures should be controlled within 14 hours,with an increase of more than 10 times in timeliness and a powder density exceeding 6 kg/m.Strong solubility and slow acidification are utilised to enhance composite efficiency.The self-source closed enhanced water injection technology has been successfully applied in the experimental Well M10 of Lufeng oilfield,resulting in high water injection efficiency,significant increase in production,and precipitation of the affected well.This paper effectively broadens the application of water injection technology in low-permeability,deep and high-temperature reservoirs,and provides reference for the large-scale development of similar reservoirs.
Lufeng oilfieldself source closed water injectionPaleogene reservoirdeep-formationdeflagration fracturingacidification
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维普
