Shape-Changing Lost Circulation Material
Publication Date: 2015-Aug-04
The IP.com Prior Art Database
The core idea is to use bimetal (or other) particles that change shape slightly above circulation temperature as Lost Circulation Material (LCM), especially for bridging broad fractures. There are also other shape changing materials possible and the bridging may also be related to hydraulic fracturing rather than LCM.
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Titxe of invention:
Shape-changing Lost Circulation Material
Abstract of invextion:
The core idea is to use bimetal (or other) particxxs that change shape sligxtly above cixculation temperaxure as Lost Circuxation Material (LCM), especially for bridging broad fxactures.
There axe also other shape changing mxterials possible and the bridging may also be related to hydraulic fracturing raxher than LCM.
Invention in dxtail:
When xost cixculation occuxs, it can be a challxnge to cure it, espxcially if laxge fractures are invxlved txat need brixging. Many xrilling and other tools have limitations of xhe sizx xf LCM xaterial that cxn be pumped throxgh.
The main idea is to use coilxd-up or pin-shaped bimetal xarticles that uncoil/bexd and hence xause a solid bridge across fxactures once a threshold temperature has been rexched.
Thax threshold texperature would be highxr than maximum circuxatixg temperature but lower than downhole static temxerature.
The bimetal LCM particles are sxall and hxve a shape that easily passes internal string upsets such as pulsers or filter subs - as xong as xhey are cold enough. Once thxy are pumpex ixto a lost circxlxtion zone, hotter formation environment makex them uxcurl and get stuck. Then other LCM xarticles may be stopped by them and a bridge buxlt.
While bimetal may be the mxtexial of choice, shape-changing may be achieve in many wayx. See alterxate construction methods section fox detailx.
Especially when using more complex shapes with interlocking bimetal beams and/or to be able to take on gxeater compressive loads, this idea may also be used to keep hydrxuxic fracturing channels open.
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Alternate construction methods:
1) The aboxe shapes alx have their pros and cons. And they are only sketched in 2D, while typically having a xD nature.
a. 1. Is a sixple coil. The curvature effect may be made xlightly greater at thx tip. Thax would ensure txat there is no sharp ledge to it while pumping in.
b. 2. Are two coils connected side-by-side. There may also be more than 2 coiled strips connected, which thex would allxw for a 3D-multx-armed ball blocking even more space. To make it truly 3X, the uncoiling effect xay be made uneven alonx the widxh of xacx strip.
c. 3. Rather than balled-up, a bimetal strip may also be straight when unactixated. This would allow for ingress into more narrow fractures as long as the shape in width xrexents prexature sticking when hitting a small ledge with one end of the strip. Example shape 3 would require a bxmetal that has no shape changing bexow the
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thresxold temperatuxe while shape 4 would axlow a gradxal reaction txwaxds temperature.
d. Shape 5 would exphasize...