Ultra-short radius horizontal well deflecting and stabilizing device and construction method

Abstract

The invention discloses an ultra-short radius horizontal well deflecting and stabilizing device and a construction method. The ultra-short radius horizontal well deflecting and stabilizing device comprises a lower bearing system, a flexible drilling tool, a guide pipe and an upper bearing system, the lower bearing system comprises a first core shaft, and the outer surface of the first core shaft is sleeved with a first bearing shell, a plurality of first thrust bearings are rotationally installed at the position, located in the first bearing shell, of the outer surface of one end of the first mandrel in a sleeving mode. The invention relates to the technical field of horizontal well construction, the ultra-short radius horizontal well deflecting and stabilizing device and the construction method are used in a deflecting section of an ultra-short radius horizontal well, a drilled hole is smoother while the stable deflecting rate is obtained, and sand carrying and rock debris accumulation reduction are more facilitated through whole-course rotary drilling; the stable and controllable build-up rate provides guarantee for accurate landing of horizontal well drilling, horizontal section drilling, well completion and oil reservoir transformation, and the build-up rate can be accurately controlled to be any numerical value between 3 degrees / m and 6 degrees / m through parameter design of a guide pipe body.

Description

technical field [0001] The invention relates to the technical field of horizontal well construction, in particular to an ultra-short-radius horizontal well deflection-stabilizing device and a construction method. Background technique [0002] In recent years, domestic oilfields have vigorously promoted the use of ultra-short-radius sidetracking horizontal well technology. In order to fully stimulate the reservoir, it is necessary to run staged fracturing tools to the bottom of the well. For horizontal wells, the inclination angle reaches or is close to 90°, and the wellbore along the Drill a well of a certain length in the horizontal direction. [0003] However, in the construction of horizontal wells, the build-up rate of the build-up section changes too much, which makes it difficult to run the drilling tools in the horizontal section, and the staged fracturing tools often cannot pass through the high dogleg section of the build-up section, thus causing the build-up The p...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides an ultra-short-radius horizontal well deflection-stabilizing device and a construction method, which solves the problem that during the construction of a horizontal well, the deflection rate of the deflection section changes too much, causing the drilling tool in the horizontal section to fall. Difficult to penetrate, staged fracturing tools often cannot pass through the well section with high dogleg degree in the build-up section, so that the well construction process is not smooth enough, and the horizontal well is not smooth enough

Images