Deep-sea water-pipe-free drilling-with-casing sleeve going-down technology and device
A technology of follow-pipe drilling and casing device, which is applied in the field of deep-sea riser-free follow-pipe drilling and casing laying technology and device, can solve the complex drilling conditions, high construction risks, and difficult casing running operations, etc. problems, to reduce the probability of accidents in the hole, simplify the construction operation procedures, and achieve the effect of good economic benefits.
Pending Publication Date: 2020-06-12
GUANGZHOU MARINE GEOLOGICAL SURVEY
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Problems solved by technology
[0006] In order to solve the above-mentioned technical problems, the present invention provides a method for deep-sea riser-free drilling with complicated drilling conditions, difficult casing operation, high construction risk, and high cost. Casing tools, under-casing reamers, downhole dynamic drilling tools, etc., optimize the matching drilling tool combination, optimize the drilling process with the pipe, realize drilling (reaming) and casing at one time to complete the well, and solve the problem of deep-sea riser-free drilling Deep-sea riser-less follow-up casing drilling technology with technical problems such as difficult casing operation in complex formations, high construction risks, and high operating costs
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Embodiment 1
[0026] Connect the casing with the designed length first, and run a set of drilling tool assembly with guide bit, underreamer under casing, drill collar and screw motor inside the casing, and the drill pipe part above the drilling assembly passes through the casing The tool is connected with the casing, drilled to the bottom of the sea, the screw motor is used to drive the pilot bit to drill a new wellbore, and the hole is reamed to the designed diameter through the underreamer under the casing. The designed diameter is larger than the outer diameter of the casing, and the drill When the casing design depth is reached, the casing tool disengagement mechanism is activated, the casing is disengaged and the casing is left at the predetermined position, the drill is lifted, and subsequent operations are carried out.
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The invention relates to the technical field of ocean engineering, in particular to a deep-sea water-pipe-free drilling-with-casing sleeve going-down technology and device. Drilling (reaming) sleeve going-down simultaneous shaft-sinking is achieved, and the problems that deep-sea water-pipe-free drilling is complex, sleeve going-down work in a stratum is difficult, the construction risk is high, and the operation cost is high are solved. The method comprises the following steps that (a) a sleeve in a designed length is well connected; (b) a drill rig combination composed of a guide drill bit,a sleeve lower reamer, a drill collar and a screw motor is arranged in the sleeve; (c) the sleeve runs to the seabed; (d) the screw motor drives the guide drill bit to drill a new borehole, and the borehole is reamed to a designed well diameter through the sleeve lower reamer; (e) the sleeve drills until the sleeve design depth is reached; (f) a sleeve going-down tool disengaging mechanism is started to make the sleeve disengaged and make the sleeve left at a preset position; (g) the drill bit is lifted; and (h) subsequent operation is carried out.
Description
technical field [0001] The present invention relates to the technical field of marine engineering, in particular to a deep-sea riser-free casing drilling process and device. Background technique [0002] As we all know, 71% of the earth's area is covered by oceans, which contain rich mineral resources, including oil, natural gas, gas hydrate, and metal mineral resources such as nickel, cobalt, manganese, lead, zinc, gold, silver, and aluminum. All over the world, with the continuous development of economy and society, the development and utilization of land resources are becoming increasingly exhausted, so that the development and utilization of marine mineral resources has received widespread attention, and even presents an increasingly fierce global competition situation. To understand the earth, it is necessary to study the oceans and the layers of the ocean floor. According to experts' estimates, 40% of the world's total future oil and gas reserves will come from the de...
Claims
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IPC IPC(8): E21B7/20E21B7/28E21B7/12
CPCE21B7/20E21B7/28E21B7/12
Inventor 叶建良谢文卫张伟熊亮王偲于彦江寇贝贝史浩贤卢秋平陈靓申凯翔
Owner GUANGZHOU MARINE GEOLOGICAL SURVEY