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In stimulation treatments to increase the production of hydrocarbons from subterranean formations, especially in treatments including hydraulic fracturing followed by gravel packing, desirable short wide fractures are created and filled with proppant by deliberately including in the first fluid/prop

In stimulation treatments to increase the production of hydrocarbons from subterranean formations, especially in treatments including hydraulic fracturing followed by gravel packing, desirable short wide fractures are created and filled with proppant by deliberately including in the first fluid/proppant slurry pumped a sufficiently high concentration of a bridging-promoting material, such as fibers, that reduces the mobility of the slurry when it dewaters so that screenout at or near the tip occurs.

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1. A method of causing a tip screenout in a wellbore treatment, comprising injecting a slurry of a proppant in a carrier fluid above fracturing pressure, comprising adding to the slurry a sufficient amount of a bridging-promoting material to cause the slurry to screen out.2. The method of claim 1 co

1. A method of causing a tip screenout in a wellbore treatment, comprising injecting a slurry of a proppant in a carrier fluid above fracturing pressure, comprising adding to the slurry a sufficient amount of a bridging-promoting material to cause the slurry to screen out.2. The method of claim 1 comprising adding a bridging-promoting material to the slurry at the start of slurry injection.3. The method of claim 2 further comprising ceasing addition of the bridging-promoting material to the slurry after the initiation of the tip screenout.4. The method of claim 1 comprising adding a bridging-promoting material to the slurry after the start of slurry injection.5. The method of claim 4 further comprising ceasing addition of the bridging-promoting material to the slurry after the initiation of the tip screenout.6. The method of claim 1 wherein the bridging-promoting material is a fibrous material selected from the group consisting of natural organic fibers, comminuted plant material, synthetic organic fibers, fibrillated synthetic organic fibers, glass fibers, carbon fibers, ceramic fibers, inorganic fibers, metal filaments and mixtures thereof.7. The method of claim 6 wherein the synthetic organic fibers are selected from the group consisting of polyaramide, polyester, polyamide, novoloid and novoloid-type polymer.8. The method of claim 6 wherein the fibrous material has a length of about 2 to about 30 millimeters and a diameter of about 5 to about 100 microns.9. The method of claim 1 wherein the concentration of proppant the slurry is increased at about the same time as the bridging-promoting material is added.10. The method of claim 1 wherein the rate of injection of the slurry is increased at about the same time as the bridging-promoting material is a added.11. The method of claim 1 wherein the amount of bridging-promoting material is from about 0.5 to about 3 per cent of the liquid in the slurry.12. The method of claim 1 wherein the amount of bridging-promoting material is from about 1 to about 2 per cent of the liquid in the slurry.13. The method of claim 1 wherein the wellbore treatment is elected from the group consisting of hydraulic fracturing, hydraulic fracturing followed by gravel packing, and combined hydraulic fracturing and gravel packing.14. The method of claim 1 wherein a sand control screen is in place before the wellbore treatment.15. The method of claim 1 wherein the fluid component of the slurry is selected from the group consisting of emulsions, foams, and energized fluids.16. A method of causing a tip screenout during stimulation of a subterranean formation penetrated by a wellbore containing a screen to prevent sand production comprising:a) pumping a first fluid into the formation at a pressure sufficient to initiate and propagate one or more fractures; b) pumping a second fluid comprising a slurry comprising a liquid, at least one proppant, and a sufficient amount of at least one bridging-promoting material to cause the slurry to screen out as the liquid leaks off into the formation; c) pumping a third fluid comprising a slurry comprising a liquid and at least one proppant; and d) filling said one or more fractures and the annulus between the wellbore and the screen with an accumulation comprising at least one proppant. 17. A method of causing a tip screenout during stimulation of a subterranean formation penetrated by a wellbore comprising:a) pumping a first fluid into the formation at a pressure sufficient to initiate and propagate one or more fractures; b) pumping a second fluid comprising a slurry comprising a liquid, at least one proppant, and a sufficient amount of at least one bridging-promoting material to cause the slurry to screen out as the liquid leaks off into the formation; c) pumping a third fluid comprising a slurry comprising a liquid and at least one proppant; and d) filling said one or more fractures with an accumulation comprising at least one proppant.