The Research Of The Drilling Completion Technology Of Gas Barrier Area In Lamadian Oil Field

Lamadian oil field is a controlled by tectonic layer sandstone gas cap field, distribution of gas cap reservoir in the diagram at the top of the structure. To keep the interface of oil and gas is relatively stable, prevent oil and gas channeling, use barrier to separate gas and oil reservoir, and formation of gas gathering area.Lamadian oil field in polymer south China and the west area of gas barrier area, shallow gas, gas cap gas. Began in2007in the second group of upper injection gas barrier, injection well during drilling wellhead is asked to keep more than5.0MPa pressure, keep the poly barrier test area polymer injection barrier strip is stable, are not destroyed, not a gas channeling; The wellblock of formation fracture pressure difference; Large stratigraphic dip, maximum reach23degree; Well spacing density is big, irregular pattern will influence the polymer flooding effect time and improve the recovery rate, in order to ensure the development effect for the purpose of150meters above the layer of horizontal displacement directional well drilling, take five sections of profile design reservoir section target and target areas for cylindrical radius of25m, on target requirements and shallow depth, with well group well type so with the same well group is close to the well borehole trajectory.This makes drilling construction in the following difficulties:one is the conventional injection-production well drilling method cannot achieve the stability condition of gas storage poly barrier strip; The second is the drilling construction easy occurred in shallow gas blowout, polymer injection barrier layer a high pressure can lead to low fracture pressure lost circulation, large dip Angle of hole deviation, group around the barrier between directional well construction is difficult;3it is completion shallow gas and gas cap reservoir is used when angry, cause to take outside the tube.In view of the above problem, this article through to lamadian oil field gas barrier area analysis, formulate corresponding technical countermeasures and put forward the lamadian oil field gas storage poly barrier area drilling completion the project technology research, improve the rate of penetration, in order to achieve well bore quality and ensure the quality of well bore, etc.