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Controlling transient pressure conditions in a wellboreRelated Patent Categories: Wells, With Explosive Or Gas Generating Means In WellControlling transient pressure conditions in a wellbore description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070034369, Controlling transient pressure conditions in a wellbore. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS REFERENCE TO RELATED APPLICATION [0001] This is a divisional of U.S. Ser. No. 10/710,564, filed Jul. 21, 2004, which is a continuation-in-part of U.S. Ser. No. 10/667,011, filed Sep. 19, 2003, which is a continuation-in-part of U.S. Ser. No. 10/316,614, filed Dec. 11, 2002, now U.S. Pat. No. 6,732,798, which is a continuation-in-part of U.S. Ser. No. 09/797,209, filed Mar. 1, 2001, now U.S. Pat. No. 6,598,682, which claims the benefit of U.S. Provisional Application Ser. Nos. 60/186,500, filed Mar. 2, 2000; 60/187,900, filed Mar. 8, 2000; and 60/252,754, filed Nov. 22, 2000. Each of the referenced applications is hereby incorporated by reference. TECHNICAL FIELD [0002] The invention relates to improving reservoir communication within a wellbore. BACKGROUND [0003] To complete a well, one or more formation zones adjacent a wellbore are perforated to allow fluid from the formation zones to flow into the well for production to the surface or to allow injection fluids to be applied into the formation zones. A perforating gun string may be lowered into the well and the guns fired to create openings in casing and to extend perforations into the surrounding formation. [0004] The explosive nature of the formation of perforation tunnels shatters sand grains of the formation. A layer of "shock damaged region" having a permeability lower than that of the virgin formation matrix may be formed around each perforation tunnel. The process may also generate a tunnel full of rock debris mixed in with the perforator charge debris. The extent of the damage, and the amount of loose debris in the tunnel, may be dictated by a variety of factors including formation properties, explosive charge properties, pressure conditions, fluid properties, and so forth. The shock damaged region and loose debris in the perforation tunnels may impair the productivity of production wells or the injectivity of injector wells. [0005] One popular method of obtaining clean perforations is underbalanced perforating. The perforation is carried out with a lower wellbore pressure than the formation pressure. The pressure equalization is achieved by fluid flow from the formation and into the wellbore. This fluid flow carries some of the damaging rock particles. However, underbalance perforating may not always be effective and may be expensive and unsafe to implement in certain downhole conditions. [0006] Fracturing of the formation to bypass the damaged and plugged perforation may be another option. However, fracturing is a relatively expensive operation. Moreover, clean, undamaged perforations are required for low fracture initiation pressure (one of the pre-conditions for a good fracturing job). Acidizing, another widely used method for removing perforation damage, is less effective in removing the perforation damage, or for treating sand and loose debris left inside the perforation tunnel. Additionally, having undamaged perforations implies a better matrix or acid fracture job in a carbonate formation. [0007] A need thus continues to exist for a method and apparatus to improve fluid communication with reservoirs in formations of a well. SUMMARY [0008] In general, a method and apparatus for use in a wellbore includes running a tool string to an interval of the wellbore, and activating a first component in the tool string to create a transient underbalance pressure condition in the wellbore interval. A second component in the tool string is activated to create a transient overbalance pressure condition in the wellbore interval. [0009] In general, according to another embodiment, a method and apparatus for use in a wellbore includes running a tool string to an interval of the wellbore, and activating a first component in the tool string to create a transient overbalance pressure condition in the wellbore interval. A second component in the tool string is activated to create a transient underbalance pressure condition in the wellbore interval. [0010] Other or alternative features will become apparent from the following description, from the drawings, and from the claims. BRIEF DESCRIPTION OF THE DRAWINGS [0011] FIG. 1 illustrates a tool string for applying transient underbalance and/or overbalance pressure conditions in a wellbore interval, according to some embodiments. [0012] FIG. 2 is an exploded view of a portion of the tool string of FIG. 1. [0013] FIG. 3 illustrates a perforating gun according to an embodiment of the invention. [0014] FIG. 4 illustrates a tool according to another embodiment of the invention. [0015] FIGS. 5-7 are timing diagrams to illustrate generation of transient underbalance and overbalance pressure conditions in a wellbore. [0016] FIGS. 8 and 9 illustrate tools according to other embodiments for creating a transient underbalance condition. [0017] FIG. 10 illustrates a tool for generating a controlled, transient overbalance condition, according to an embodiment. DETAILED DESCRIPTION [0018] In the following description, numerous details are set forth to provide an understanding of the present invention. However, it will be understood by those skilled in the art that the present invention may be practiced without these details and that numerous variations or modifications from the described embodiments may be possible. Continue reading about Controlling transient pressure conditions in a wellbore... 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