MULTIPOSITION VALVE FOR FORMATION HYDRAULIC FRACTURING AND PROTECTION AGAINST SAND PHENOMENA AND METHOD OF WELL COMPLETION Russian patent published in 2013 - IPC E21B34/14 F16K17/36 

FIELD: oil and gas industry.

SUBSTANCE: there is a description of pipe string for well completion installed in position neighbouring to zone or zones where hydraulic fracturing (HF) is to be performed and inflow is to be obtained. In preferable version its peculiarity concludes in valves with sliding couplings allowing implementation of at least two configurations; wide opening and opening of channel with filtering material located in it. Valve unit may have three positions where a position of complete closing is added to two above mentioned positions. After run-in-hole operation valves may be set to position of wide opening in any order required for HF. After completion of HF valves may be either closed or set to filtering position in a differentiated way to get inflow from the zone subjected to HF in any required order. There are various methods for valves actuation described. Pipe string may be provided with telescopic forcers providing HF if it is required to do string cementing. According to alternative version pipe string run in uncased well is just provided with holes for HF liquid passing through and outer packers for provision of HF in any required order.

EFFECT: proving HF in separated zones of formation in required order.

40 cl, 33 dwg