Research and Field Test of Wellbore Reconstruction Technology Based on Expandable Tubular for Horizontal Well
Addressing the challenge of immature precise refracturing technology for low-producing horizontal wells in the strongly heterogeneous tight conglomerate reservoirs of Mahu in Xinjiang,research and field test on wellbore reconstruction technology using expandable tubular were conducted.Through a series of full-scale physi-cal simulation experiments on expandable tubulars,including internal pressure resistance and annular sealing,it was verified that various index parameters of the expandable tubulars meet the requirements of high-pressure re-fracturing conditions,and the effectiveness of bridge plugging-perforation operations was also validated.Finite ele-ment numerical simulation of the expandable tubulars was carried out to clarify the changes in Mises stress,strain,and contact stress during the expansion process.Under the action of the expansion cone,the expandable tubulars undergo radial plastic deformation,with the expansion pressure stabilizing at 40 MPa to 42 MPa.Through the process design of wellbore reconstruction using expandable tubulars in horizontal wells,field test were successfully completed in test wells in the Mahu area.The original Ø127 mm casing of the test wells was reconstructed using expandable tubulars,resulting in an inner diameter of 85 mm,a reconstructed length of 1,041 meters,and a maxi-mum pressure bearing capacity of 83 MPa during refracturing operations.Post-refracturing well logging indicated that the integrity of the expandable liners was good.Through laboratory research and field test,the feasibility of wellbore reconstruction and refracturing technology using expandable tubulars in horizontal wells was verified,providing a technical reference for enhancing production in low-producing wells in unconventional oil and gas res-ervoirs.
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维普
