METHOD OF GRAVEL FILTER CONSTRUCTION Russian patent published in 2009 - IPC E21B43/04 

FIELD: oil-and-gas production.

SUBSTANCE: invention related to oil-and-gas production and can be used for well completion and for pulling-out of hole for gravel filter installation. Method of gravel filter construction includes descending filter assembly upon drill pipe column or upon tubing pressure-closed column (TCP) and its dislocation into reservoir bad. Simultaneously with descending filter assembly perform flushing of reservoir bottomhole zone with loaded mud and remove sloughed rock by natural circulation method. Then using natural circulation method displace loaded mud inside the hole with lower density and viscosity fluid. Separate hole clearance between drilling strings or pressure-closed column (TCP) and casing string in bottomhole zone. Open channels for setting up crossed flow of cleansing fluid. Prepare on top of weehead gravel-fluid composite, to pump the composite inside the well along casing string or (TCP) column using natural circulation method, then supply hole clearance with the composite throughout created channels under the level of separation. To drain fluid from inner space of filter assembly to hole clearance throughout created channels above separation level. Remove gravel excess, accumulated inside of drilling strings due to washing process or inside (TCP) column due to natural circulation method. Perform killing of the well with loaded mud to create hydrostatic backpressure in reservoir. Remove drill pipe column tubing pressure-closed column (TCP) and shut down create channels. Descend column (TCP) with production equipment.

EFFECT: extended capabilities, improvement in quality and in homogeneity of a gravel mass of gravel filter, also cost and time cutting in gravel filter construction.

1 cl, 5 dwg