Horizontal directional drilling and chambering reverse circulation hydraulic rock debris migration test device and test method

Abstract

The invention provides a horizontal directional drilling and chambering reverse circulation hydraulic rock debris migration test device and test method. The test device comprises a rotary power system, a testing system, a scrap inlet pipeline, a water supply pipeline, a water inlet pipeline, a first testing pipeline, a second testing pipeline and a backflow pipeline. The water supply pipeline, thewater inlet pipeline, the first testing pipeline, the second testing pipeline and the backflow pipeline are connected in sequence, a filter screen is arranged in the water tank, and the rotary powersystem drives the second testing pipeline to axially rotate. The testing system comprises an electromagnetic flowmeter, a pressure detection device, a Hall rotating speed sensor, a first differentialpressure transmitter and a second differential pressure transmitter. The technical scheme provided by the invention has the advantages that a horizontal directional drilling and chambering reverse circulation hydraulic rock debris migration test can be systematically carried out, the flowing mode and energy loss of solid-liquid two-phase flow in a rotating drill rod are researched, and the influence of parameters such as water inlet flow, drill rod rotating speed, rock debris particle size and content on the flowing mode and energy loss of the solid-liquid two-phase flow in the rotating drillrod is analyzed.

Description

technical field [0001] The invention relates to the technical field of trenchless engineering, in particular to a horizontal directional drilling and reaming reverse circulation hydraulic debris migration test device and test method. Background technique [0002] Horizontal directional drilling is the use of drilling equipment anchored on the ground to drill into the formation at a small incident angle relative to the ground to form a pilot hole, and then expand the diameter of the pilot hole to the required size, and pull the pipeline into Drilling is a trenchless pipeline laying technique. [0003] As the diameter of the laid pipeline increases, the diameter of the borehole increases, and the annular mud flow rate decreases significantly during horizontal directional drilling and reaming. Under the low annular mud flow rate, reaming cuttings are easy to deposit at the bottom of the borehole to form a cuttings bed, which drastically reduces the cuttings migration efficienc...

AI Technical Summary

Problems solved by technology

However, the existing reverse circulation technology is practical in the field of horizontal directional drilling to solve the problem of large-diameter horizontal directional drilling cuttings mig

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