A METHOD FOR PROVIDING A PREFERENTIAL SPECIFIC INJECTION DISTRIBUTION FROM A HORIZONTAL INJECTION WELL

摘要

A method for distributing injection fluid in a horizontal well bore in fl uid communication with hydrocarbon bearing formation begins by determining f low resistance characteristics of the formation along at least a portion of the length of the horizontal well bore. An injection tubing string having a sidewall defining a tubing bore is injected into the horizontal well bore. T he tubing string is provided with ports having a selected distribution and g eometry. The annulus geometry is selectively controlled along the length of the tubing string through at least one of axial distribution of eccentricity and flow area of the annulus, so as to provide selected flow restriction ch aracteristics along the annulus, such that when injection fluid is pumped in to the tubing, a resulting flow resistance network is formed by the tubing b ore, the ports, the annulus and the formation, resulting in a desired distri bution of the fluid into the formation.