INDUCING FLOWBACK OF DAMAGING MUD-INDUCED MATERIALS AND DEBRIS TO IMPROVE ACID STIMULATION OF LONG HORIZONTAL INJECTION WELLS IN TIGHT CARBONATE FORMATIONS

摘要

An open-hole horizontal water injection well in a tight formation is conditioned prior to an acidizing treatment by subjecting the injection zone to a flowback stage, optionally at reduced pressure, in order to remove undesirable materials such as formation-damaging polymers, chemical residues from pipe dope and the like, from the surface and adjacent formation pores, and producing the formation fluid to the wellhead at the earth's surface where it can be monitored for a reduction in the undesirable materials.