Tight oil or gas formation fracturing process
阅读：551发布：2022-05-07
专利汇可以提供Tight oil or gas formation fracturing process专利检索，专利查询，专利分析的服务。并且According to the invention, a process of fracturing tight oil or gas formations by drilling a band of small holes into the oil or gas formation from a well borehole, so that more explosive or hydraulic fracturing fluids can be placed at a selected depth and positioned to provide more lifting and fracturing force on the oil or gas formation.，下面是Tight oil or gas formation fracturing process专利的具体信息内容。
1. The process of fracturing tight oil or gas formations by drilling into the the tight oil or gas formation from a selected depth in a well borehole in the tight oil or gas formation a band consisting of one or more layers which consist of small holes drilled perpendicular from the well borehole into the tight oil or gas formation, the small holes which comprise a layer are drilled at the same depth and from as many points that can be drilled around the circumference of the well borehole so the small holes will radiate out from the well borehole into the tight oil or gas formation, injecting liquid explosive into the small holes after they have been drilled and igniting said explosive to exert fracturing pressure on the tight oil or gas forMation from the small holes, wherein the method used in drilling the small holes consists of lowering a tubing string into the well borehole with a ninety degree elbow attached to the downhole end of the tubing string string and setting the tubing string so the open end of the 90* elbow interfaces with the well borehole wall where a small hole is to be drilled, lowering a drill pipe string down through the tubing string with a flexible hollow shaft attached to the downhole end of the drill pipe string, a tool joint attaching the uphole end of the flexible hollow shaft to the downhole end of the drill pipe string and a drill bit attached to the downhole end of the flexible hollow shaft by means of a tool joint, applying rotation and down pressure to the drill pipe string from the top of the well borehole whereby the drill pipe string rotates and forces the drill bit and flexible hollow shaft through the 90* elbow and drills the drill bit and flexible hollow shaft into the tight oil or gas formation drilling a small hole until the tool joint that attaches the flexible hollow shaft to the drill pipe string is near the point where the tubing string attaches to the 90* elbow, then applying hoisting action to the drill pipe string by the conventional well drilling equipment at the top of the well borehole until the flexible hollow shaft and drill bit have been pulled from the drilled small hole in the tight oil or gas formation into the 90* elbow rotating the tubing string after the drill bit has been pulled into the 90* elbow until the open end of the 90* elbow interfaces with the well borehole wall where the next small hole of a layer is to be drilled, lowering the tubing string when all the small holes of a layer are drilled to the point in the well borehole where the next layer of small holes is to be drilled if the band of small holes requires more than one layer of small holes.
2. In claim 1 comprising drilling one or more drain holes in the 90* elbow near the ninety degree elbows open end which interfaces with the well borehole wall so drilling fluids pumped down through the drill pipe string, through the tool joint that connects the drill pipe string to the flexible hollow shaft, through the flexible hollow shaft, through the tool point that connects the flexible hollow shaft to the drill bit, through the drill bit into the small hole being drilled and with cuttings from the small hole being drilled can be exhausted into the well borehole.
3. In claim 1 when the tight oil or gas formation is at great depths or when very small holes are to be drilled a downhole motor attached to the downhole end of the drill pipe string is used to rotate the flexible hollow shaft and the drill bit, a tool joint attaches the uphole end of the flexible hollow shaft to the output shaft of the downhole motor.
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