RU97115104A - METHOD OF GRAVEL PACKING OF OPEN INTERMEDIATE UNDERGROUND - Google Patents

Claims (10)

1. The method of gravel packing an opened interval of a subterranean formation, which is held by a cased wellbore, the method comprising: forming perforations in a cased wellbore adjacent to the opened interval; the placement of sand in the working string of the wellbore, and the working string includes a gravel pack filter, which lies near the open gap with the formation of the annulus of the open gap when the working string is placed inside the well bore; pumping a clean liquid, not containing essentially crushed material, into said annular space of the opened gap and from it through perforations into the formation, thereby squeezing out any plugging material from the perforations so that they become permeable to flow; continued pumping of clean fluid into the annulus of the gap and through the perforations until all of these perforations become permeable to flow; stopping the injection of clean liquid; pumping a suspension containing particles into the annulus of the exposed gap to supply particles through alternative flow paths to levels within the hydraulic fracturing gap to thereby deposit particles in perforations and in the annulus; continued pumping of the suspension until the indicated perforations and the annulus of the opened interval are filled with particles.  2. The method according to claim 1, wherein the clean fluid is a clean hydraulic fracturing gel, and the particles of the suspension are sand.  3. The method according to claim 1, wherein the fluid is pumped at a higher flow rate than the suspension.  4. The method of claim 1, wherein the hydraulic fracturing fluid is injected at a rate of greater than about 8 barrels (952 L) per minute, and said suspension flows at a rate of less than about 6 barrels (114 L) per minute.  5. The method according to claim 1, wherein alternative flow paths are provided by branch pipes that are radially around the work string and which pass through an open gap, each of the branch pipes having inlet and outlet openings located along its length.  6. The method according to p. 2, including: pumping a clean gel of hydraulic fracturing through perforation into the formation to initiate and expand hydraulic fracturing in it.  7. The method according to claim 6, comprising: separating a portion of the annulus that lies close to the specified open gap before pumping clean hydraulic fracturing fluid into the annulus of the open gap.  8. The method according to p. 7, in which a clean hydraulic fracturing gel is pumped at a higher flow rate than the suspension.  9. The method according to p. 8, in which a clean hydraulic fracturing gel is injected at a speed of more than about 8 barrels (952 L) per minute, and the specified suspension is pumped at a speed of less than about 6 barrels (114 L) per minute.  10. The method according to p. 9, in which alternative flow paths are provided by branch pipes that are radially around the work string and which pass through an open interval in which each of the branch pipes has inlet and outlet openings located along its length.