A Medium and Long Radius Trajectory for Two-Dimensional Small Target Ahead Horizontal Wells

Abstract

The invention relates to a medium-long radius orbit of a horizontal well with a two-dimensional small target distance. The distance before the target is less than 86m. Horizontal section track; reverse build-up track includes vertical well section, reverse build-up arc section, reverse build-up track straight line section and fall-down arc section that are tangent in sequence from top to bottom; build-up landing track includes The first inclination arc section, the inclination landing track stabilization straight line section and the second inclination arc section, which are tangent to each other and the inclination angle increases sequentially from top to bottom, and the starting point of the upper end of the first inclination arc section is the midpoint of the orbit; the horizontal section of the orbit extends along the line between the first target point and the second target point, and the radius of each arc segment ranges from 191m to 286.5m. The medium and long radius orbit of the two-dimensional small target front distance horizontal well can solve the contradiction between complex ground conditions and medium and long radius orbit horizontal well location optimization by increasing the displacement in front of the target by reverse build-up.

Description

technical field [0001] The invention relates to a medium-to-long radius orbit of a horizontal well, in particular to a medium-to-long radius orbit of a two-dimensional small target distance horizontal well, and belongs to the technical field of petroleum drilling. Background technique [0002] In the field of oil drilling, horizontal wells are the fastest-growing and most widely used drilling technology in recent years. They have technical advantages such as greatly improving oil and gas recovery, accelerating capital recovery, and reducing costs. Horizontal wells are divided into five types according to the radius of curvature of the wellbore trajectory. ①Long-radius horizontal well, curvature radius R>286.5m, build-up rate K<20° / 100m; ②medium-long radius horizontal well, curvature radius R=286.5m-86m, build-up rate K=(20°-67°) / 100m; ③Medium and short-radius horizontal wells, curvature radius R=86m-28.65m, K=(67°-200°) / 100m; ④short-radius horizontal wells, curvature...

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Problems solved by technology

[0008] Compared with the prior art, the present invention has achieved the following beneficial effects: (1) the track of the present invention is smoothly connected successively by the first part of the reverse ramping track, the second part of the ramp-increasing landing track and the third part of the horizontal section track; The tangential reverse-increasing arc section, the reverse-inclination-stabilizing straight-line section and the declination-arc section reach the midpoint of the orbit to achieve a well inclination angle of zero degrees, which increases the reverse displacement and makes the displacement in front of the target reach a suitable level. Appropriate displacement of the long-radius orbit, and then connect with the horizontal track through the tangential first increasing arc section, increasing inclined landing track stabilizing straight line section and second increasing inclined arc section; (3) the original design cannot be The wellbore trajectory of the horizontal well with a small target distance in the middle and long radius orbit is determined as a medium and long radius orbit, which overcomes the problem that the conventional Φ216 wellbore with a small target distance can not be applied to the medium and short radius drilling technology; (4) avoids the Due to the small target distance, the wellhead position has to be moved to become a long target displacement horizontal well. Compared with conventional target displacement horizontal wells, the drilling footage is increased, and the construction difficulty and drilling cost are increased; (5) Some wells are avoided due to site conditions The location of the mobile wellhead is too large to give up construction, which effectively solves the problem of determining the location of the horizontal wellhead under complex ground conditions, and provides a new means for the development of complex small fault block oilfield reservoirs; Between m, for the Φ216 wellbore, the deflection rate is low and the bend is flat, which is conducive to the smooth running of the drilling tool and the drill string has a long life; Casing completion method; (8) Compared with medium and short-radius horizontal wells, it does not need continuous deflection build-up, there is a straight line section for stabilizing the slope, the difficulty and risk of landing is small, the difficulty of trajectory control is small, and the risk of pipe sticking is small

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