METHOD OF PROTECTIVE SLEEVES INSTALLATION IN HORIZONTAL HOLE UNDER WATER OR OTHER BARRIERS

摘要

FIELD: oil and gas industry.SUBSTANCE: invention is referred to the construction of main pipeline crossings by directional drilling using a sectional protective sleeve. The method of protective sleeves installation in a horizontal hole includes the usage of two protective sleeves installed at an inlet and outlet from the horizontal hole. At that upon drilling of a pilot hole it is expanded by means of two horizontal direction drilling units: at first from the outlet side of the well, then from the inlet side. Whereat both surface areas are covered by the protective sleeves right upon their extension. Then the whole horizontal hole is covered by the third sleeve of a lesser diameter to the whole length upon extension of its area between the two installed sleeves with a reamer bit of a lesser diameter.EFFECT: maintaining the integrity of the expanded areas of the horizontal hole in surface incompetent rock along the whole length of the horizontal hole.7 dwg