Lost circulation fluid treatment

Abstract

A method for separating fluid from a mixture of fluid and fibrous lost circulation material, the method including introducing the mixture onto a screen assembly that is vibrating for passage of the fluid through the screen assembly and for separation of fibrous lost circulation material from the fluid, the screen assembly comprising a plurality of screens one on top of the other and including at least a first screen and a second screen, one of the screens with comprising a screen mesh woven with non-square openings as viewed from above.

Description

[0001] This is a continuation-in-part of U.S. Ser. No. 09 / 432,959 filed Nov. 8, 1999, incorporated fully herein for all purposes.[0002] 1. Field Of The Invention[0003] This invention is directed to methods for separating drilling fluid from a mixture of such fluid and lost circulation materials and to apparatuses useful in such methods.[0004] 2. Description of Related Art[0005] Often in drilling a wellbore, the circulation of drilling fluid to and then away from the drill bit ceases due to fracturing of the formation through which the wellbore is being drilled. Drilling fluid pumps into the fractured formation rather than being returned to the surface. When circulation is lost because of fracturing of the formation, it is usually supposed that the fracture occurred at some specific depth where the formation is "weak", and that the fracture extends horizontally away from the borehole. Expressions used to describe rocks that are susceptible to lost returns include terms like vugular l...

AI Technical Summary

Benefits of technology

[0024] In certain aspects by using non-square rectangular openings a larger opening area is presented to a fiber than is presented by a square opening with a side equal to the width of the rectangular opening (i.e. the length of the non-square rectangular opening is longer than the length of the side of the square). A fiber caught on a wire and / or bridging such a non-square rectangular opening while connected to one or two wires or laying across two wires of such an opening, does not block flow through the non-square opening to the extent that such a fiber would block flow through the square opening, i.e. the percentage of area of the non-square opening blocked by the fiber is less than the percentage of the total area of the square opening that would be blocked by the fiber. In certain aspects in such a situation there may also be more fluid f low against such a fiber and past the fiber's surfaces when using the non-square openings as compared to the amount of such fluid flow through a square opening. Thus loosening and / or wash through of the fiber may be facilitated by using the non-square openings. Such facilitation may be further enhanced by flowing the fluid to be treated in the general direction of the length of the non-square rectangular openings.

Problems solved by technology

In certain prior art screens that use square mesh openings fibrous lost circulation material can become trapped between the top two meshes of a screen.

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