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Lost circulation fluid treatment

Inactive Publication Date: 2002-02-28
TUBOSCOPE IP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 flow 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.
[0031] Such methods in which the resident time in a screen assembly of material that can swell is reduced and the passage of such material through the screen assembly is facilitated;

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.

Method used

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Examples

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Embodiment Construction

[0057] FIGS. 19A-19D show a screen assembly 210 according to the present invention which has a lowermost screen 212, a middle screen 214, and a top most screen 216. Any one of these three screens may be deleted. The screen assembly 210 may have any known side hookstrips; and / or any known screen support (indicated by numeral 213) including, but not limited to, support strips, frame, and / or supporting perforated plate (each of which is not the legal equivalent of the others). Any two adjacent or all three screens may be bonded or connected together in any known manner.

[0058] The top screen 216 (see FIG. 19C) is woven of wires about 0.0012 to 0.0018 inches in diameter made of any suitable material, including but not limited to, metal, plastic, steel, and stainless steel, e.g. 304 or 316 SS. Any suitable known weave and weave pattern may be used. In the embodiment of FIG. 19C as viewed from above, the openings between intersecting wires are non-square and rectangular. In the embodiment ...

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Abstract

A method for separating fluid and fibrous lost circulation material from a mixture thereof that also includes drilled cuttings, the method including introducing the mixture onto a screen assembly that is vibrating for passage of the fluid and fibrous lost circulation material through the screen assembly and for separation of the driled cuttings from the fluid, the screen assembly with 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 a screen mesh with non-square openings as viewed from above to facilitate the passage of fibrous lost circulation material through the screen assembly.

Description

[0001] This is a continuation-in-part of U.S. Ser. No. 09 / 432,959 filed Nov. 8, 1999, and a continuation-in-part of U.S. application Ser. No.______ filed______ entitled "Lost Circulation Fluid Treatment" both co-owned with the present invention and application and both 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 the porosity of the formation and / or 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, it is usually supposed that the lost circulation occurred at some specific depth w...

Claims

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Application Information

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IPC IPC(8): B01D29/01B01D33/00B01D33/03B01D39/12B07B1/46
CPCB01D29/012B01D33/0093B01D33/0376B01D39/12B07B1/4663E21B21/065B07B1/469B07B1/4672B01D29/05
Inventor ADAMS, THOMAS C.LARGENT, DAVID W.SCHULTE, DAVID L.
Owner TUBOSCOPE IP
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