Well completion method for ultra-deep horizontal well borehole

Abstract

The invention relates to the technical field of oil well exploitation, in particular to a well completion method for an ultra-deep horizontal well borehole, which is completed through a preset tubular column and a tie-back tubular column, and comprises the following steps: step a, the preset tubular column is put down, so that a multifunctional releasing tool, a drill bit, a tie-back barrel, a plurality of high-torsion-resistance oil pipes and a plurality of high-torsion-resistance soluble screen pipes are sent to a preset well depth by a drill rod; b, after the pipe column is preset in place, the drill rod is positively pressed, and the multifunctional releasing tool is separated from the tie-back barrel, so that the tie-back barrel, the multiple high-torsion-resistance oil pipes, the multiple high-torsion-resistance soluble screen pipes and the drill bit are left at the well bottom; c, a tie-back pipe column is tripped in till a sealing short section at the bottom end of the oil pipe is connected with a tie-back barrel of the preset pipe column in a tie-back mode; and d, setting a packer of the tie-back pipe column, and completing the well. The problems that due to a horizontal well hole, the time for simulating drifting is long, a pipe column is difficult to put down, and conventional well completion cannot be carried out are solved.

Description

technical field [0001] The present application relates to the technical field of oil well exploitation, in particular to a well completion method for an ultra-deep horizontal well bore. Background technique [0002] Horizontal wells can effectively increase single well productivity, but for ultra-deep horizontal wells exceeding 4,000 meters, drilling and completion are difficult, especially for complex reservoirs with well-developed fractures and strong heterogeneity, further reservoir stimulation is required Only then can the effect of efficient development be achieved. [0003] At present, for reservoirs characterized by pressure sensitivity, narrow safe density window, easy blowout and leakage, high risk of well control, and difficulty in carrying cuttings by drilling fluid, the conventional method of well completion is to use the hanging irrigation method to achieve dynamic balance in the well. The disadvantage of the method is that the process is extremely complicated ...

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