Coiled tubing drilling with supercritical carbon dioxide
Coiled tubing drilling with supercritical carbon dioxide
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DOI：
10.2118/65534-ms
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
J. Kollé
中科院分区：
文献类型：
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作者：
J. Kollé
一种通过使用钻井液材料来提高钻井作业效率的方法，这种钻井液材料在钻井现场存在的温度和压力条件下以超临界流体或致密气体的形式存在。该材料可用于减少机械钻削力，去除岩屑，或喷射侵蚀基板。在一个实施例中，二氧化碳（CO 2）被用作在地球上的井中钻井的材料，其中正常的温度和压力条件导致CO 2作为超临界流体存在。超临界二氧化碳（SC-CO 2）最好与连续管（CT）钻井设备一起使用。极低粘度的SC-CO - 2提供了钻头的有效冷却和有效的岩屑清除。此外，SC-CO 2在石油地层孔隙中的扩散率明显高于水，使得SC-CO 2的射流侵蚀比水射流侵蚀更有效。sc - co2射流可用于辅助机械钻井、冲蚀钻井或除垢。井口节流管汇或泥浆帽钻井设备可用于控制井内压力，以确保在钻井现场出现二氧化碳作为超临界流体或致密气体存在所需的温度和压力条件。用完的二氧化碳可以排放到大气中，收集起来再使用，或者直接进入地层以帮助石油的回收。
A method for increasing the efficiency of drilling operations by using a drilling fluid material that exists as supercritical fluid or a dense gas at temperature and pressure conditions existing at a drill site. The material can be used to reduce mechanical drilling forces, to remove cuttings, or to jet erode a substrate. In one embodiment, carbon dioxide (CO 2 ) is used as the material for drilling within wells in the earth, where the normal temperature and pressure conditions cause CO 2 to exist as a supercritical fluid. Supercritical carbon dioxide (SC—CO 2 ) is preferably used with coiled tube (CT) drilling equipment. The very low viscosity SC—CO 2 provides efficient cooling of the drill head, and efficient cuttings removal. Further, the diffusivity of SC—CO 2 within the pores of petroleum formations is significantly higher than that of water, making jet erosion using SC—CO 2 much more effective than water jet erosion. SC—CO 2 jets can be used to assist mechanical drilling, for erosion drilling, or for scale removal. A choke manifold at the well head or mud cap drilling equipment can be used to control the pressure within the borehole, to ensure that the temperature and pressure conditions necessary for CO 2 to exist as either a supercritical fluid or a dense gas occur at the drill site. Spent CO 2 can be vented to the atmosphere, collected for reuse, or directed into the formation to aid in the recovery of petroleum.