BRIEF INVESTIGATION ON PRESENT STATUS OF HORIZONTAL DRILLING AT HOME AND ABROAD

Besides of the strengthening of drilling equipment, long displacement horizontal well drilling technology together with controlling procedure of wellbore track, logging procedure and well completion technology and so on have also changed greatly. All these made the maximum horizontal displacement be reached above 8,000m. Multi-branches horizontal drilling technique resolved the problems of packer isolation effect, entry and excite ability through the casing window opened and hydraulic sealing of the window. Therefore this technique can be applied in a more extensive range. The development of these techniques is dependent upon the improvement of tolls, instruments and equipment. There is a necessity to reinforce the scientific research program to elevate the comprehensive capability of horizontal drilling techniques in China.