WELL FILTRATION CAPABILITY RECOVERY METHOD Russian patent published in 2005 - IPC

Abstract RU 2254449 C1

FIELD: oil and gas industry, particularly means to provide optimal filtration mode in wells characterized by sand sloughing in the product.

SUBSTANCE: method involves extracting product of filterless well through perforated area and controlling sand content in product when well production rate declines. When sand particles with angular shape appear in the product during designed recovery of well production rate by increasing depression drawdown inside well secondary well perforation is carried out in zone containing no clay interlayers. The secondary well perforation is performed with shot density of not less than 70% of the primary one and with channel cross-section 1.15 - 5 times greater than that of the primary one. Perforation channel length is 15% greater than range of stress in active filtration zone of productive bed rock under maximal pressure drop.

EFFECT: increased efficiency due to method simplicity, reduced time and material consumption along with maintaining operational characteristics and well operational safety.

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RU 2 254 449 C1

Authors

Khismetov T.V.

Gilaev G.G.

Dzhalalov K.Eh.

Mollaev Z.Kh.

Dates

2005-06-20—Published

2004-10-21—Filed