Research and application of conductor directional piling model for the offshore infill adjusting wells
The directional piling driving of conductor is an effective method to solve the problem of shallow anti-collision problem in offshore infill adjusting wells.However,the lack of corresponding theoretical model leads to safety risks in pile driving operations.Based on the analysis of the force on the casing shoe and the inversion of historical operation data,theoretical models of directional piling angle and deviation distance were constructed and optimized through the mechanical analysis between conductor and formation in response to drilling design and on-site operation requirements.and inversion of historical operation data.Then,the design model of the directional piling setting depth was constructed through the analysis of the bearing capacity between the conductor and formation.This research indicates that the slope angle of conductor shoe is the key factor affecting the effectiveness of directional piling.The slope angle of 20°-45° is a reasonable selection range,and the specific angle should be calculated according to the geological conditions of the well site and the parameters of the conductor.The theoretical model has been applied in the eastern of South China Sea.The application results indicate that the shallow collision risk of infill adjustment wells has been avoided,ensuring the safety of offshore operations.The research results of this paper can provide theoretical support for offshore directional pile driving operations of the offshore infill adjusting well.
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