Opening of productive layers of a cased well
At present drilling of horizontal wells followed by multi-stage hydraulic fracturing of a formation (FHF) is thought a promising universally acknowledged method of a field development. However, in some cases, an alternative economically and environmentally sound approach based on the branched mass opening of a formation productive area (FPA) by the perforation channels system of small diameter from the main vertical wellbore is possible to improve the efficiency of a field development. The article describes some specific features of additional channels creation to increase the surface of opening and drainage volume of deposits in complicated geological and technological conditions, such as cased deep wells, depression regime use, controlled drilling of long-barreled wiring channels along a predetermined path, etc. Some cable drilling perforator (perfobur) with improved controllability and information content providing optimization of material costs of wells' construction and renovation as well as increase of a well production flow-rate and enhancement of oil recovery is offered to satisfy the conditions of formations opening, mentioned above. The technology of drilling perforator (perfobur) was offered by a group of authors [25].