中原油田文东高压油气区大直径井眼钻井实践

PRACTICE IN DRILLING LARGE DIAMETER BOREHOLE IN WENDONG OIL AND GAS REGION OF ZHONGYUAN OIL FIELD

中原油田文东地区属于典型的盐间高压油气藏，油气层埋藏深，上部大直径井眼井段长。因而，如何提高大井眼钻井速度，是文东高压油气井钻井的重要课题。经过大量的实践，提出了解决这一问题的途径。从优选喷嘴组合，喷嘴类型和水力参数，增大双喷嘴直径差，配备大功率泥浆泵，降低钻井液水眼粘度等几个方面入手，以多种途径提高泵压和钻头水马力，从而提高了水力破岩能力。同时，优选钻头类型，总结出适合文东高压油气区快速钻进的三套钻头系列，从而充分发挥了钻头的工作效率，并使用合适的钻具组合及钻井参数，在满足井身质量的前提下，大幅度地提高了钻井速度，有效地降低了钻井成本。

The oil and gas reservoirs in Wendong region of Zhongyuan oil field belong to typical high pressure ones between salt beds,being of a large buried depth.Because the upper interval with large diameter borehole is long,how to raise drilling speed is an important problem of drilling high pressure oil and gas wells in Wendong region.Through a lot of practice,the way of solving such a problem is proposed.By use of many ways as optimizing nozzle assembly,nozzle pattern and hydraulic parameters,enlarging the diameter difference of dual nozzle preparing heavy duty mud pump and reducing drilling fluid viscosity,the pump pressure and bit hydraulic horsepower may be enhanced,thus raising the ability of hydraulically breaking rocks.Simultaneously,through optimizing bit type,three sets of bit series suitable for rapid drilling in Wendong high pressure oil and gas region are summarized,thus giving full play to bit′s work efficiency.And by use of a suitable drill string assembly and drilling parameters,under the prerequisite for meeting the needs of well quality,the drilling speed may be greatly raised and the drilling cost can be effectively reduced.