| 摘要 |
Method of treating, especially, horizontally deviated wellbores where various treating solutions such as, acids, slurries, proppants, fracturing fluids, flushing fluids, or sealants are transferred into an annulus formed by a casing in the well and a working string. The working string has a seal member providing a sliding seal with the casing, a perforated nipple above the seal, and a check valve above the perforated nipple for preventing back flow through the working string to the surface. The working string has a seal element at the wellhead to avoid treating solutions leaking from the annulus out the wellhead. Treating solution of the desired make-up is pumped into the annulus, through the perforated nipple, down the working string, along the horizontal deviated wellbore, then into the strata or formation through a dispersing tool for the particular treating solution. The method provides a decrease in head loss, and if the working string uses a solid rod of lesser diameter than the remainder of the working string the head loss is further minimized. The apertures in the perforated nipple may be selected according to the requirements of the treating solution being pumped into the formation. |
