Methods for controlling screenouts

A filter screen and filter cake technology, applied in chemical instruments and methods, earthwork drilling, drilling composition, etc., can solve problems such as uncertainty of the terminal screen
CN1639445AInactive Publication Date: 2005-07-13PRAD RES & DEV LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
PRAD RES & DEV LTD
Publication Date
2005-07-13
Estimated Expiration
Not applicable · inactive patent

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Abstract

Methods are presented to induce a screenout during a subterranean formation fracturing or combined fracturing and gravel packing treatment by laying down a filter cake early in the treatment, then injecting proppant slurry, and then while proppant slurry injection continues chemically damaging the filter cake with one or more filter cake degradation agents, and optional filter cake degradation agent aids, so that leak-off increases, the concentration of proppant in the fracture increases, and the proppant screens out. The additional use of bridging-promoting materials, alone or in conjunction with filter cake degradation, is included.
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Description

technical field

[0001] The present invention relates to increasing the flow of fluids into or out of a subterranean well. More specifically, the present invention relates to facilitating the flow of fluids from a rock formation into a wellbore. In particular, the present invention relates to methods for performing fracturing and gravel during hydraulic fracturing (conventional or utilizing coiled tube), during subsequent fracturing followed by gravel packing, or in one operation. The method of controlling the size, shape, position and quality of the cracks formed during the filling process. Background technique

[0002] Hydraulic fracturing, gravel packing, or the combination of fracturing and gravel packing in one operation, are widely used to facilitate the recovery of hydrocarbons, water, or other fluids from a formation. These operations involve pumping "proppant" slurries (natural or synthetic materials used to prop up fractures after they have formed) during hydrauli...

Claims

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