EXACTA-FRAC ENERGY SERVICES, INC. (Conroe, TX)
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Packers for isolating fluid pressures in well bores with cased valves are well known in the art. A lot of these packers are single-use packs that cannot be retrieved from the well bore. One example of a single-use packer is the frac plug used to isolatefracturing fluid pressure in hydrocarbon well completion or recompletion procedures. A frac plug can be removed from the bore through drilling it out using the aid of a drill connected to a tubing string. This drill-out procedure is made easier by providing a frac plug made entirely made of composite material. When such a frac plug is described in Applicant’s co-pending U.S. patent application Ser. No. No. 15/935,163 which is a Composite Fract Plug, that was filed Mar. 26, 2018 and the complete specification is included herein by reference. Frac plugs should contain high fluid pressures inside cased well bores, typically at high temperatures. The fluid pressure can cause the main sealing element of the frac plugs, to expand and loose their fluid sealing contact with the well bore casing. Anti-extrusion inhibitors can help limit sealing element extrusion and maintain the sealing element within contact with the casing of the well bore. Anti-extrusion rings comprise one kind of anti-extrusion inhibitor that has been proved to be effective in inhibiting sealing element extrusion. However anti-extrusion rings can be dislocated or deformed by the extruding of the main sealing element. It is preferable to have an anchoring restrictor for extrusion that is able to engage the casing to resist the extrusion pressure of the main sealing element.
The extreme pressure of fluids can also cause to cause the frac plug to move within the cased well bore. The frac plug is fitted with “slips” that grab the casing to anchor the frac plug within the well bore. The slips travel up a slip ramp to a setcondition, so the greater the fluid pressure on the frac-plug, the more the slips will bite and grip the casing to anchor the frac plug to the well bore. However, the thrust load on the slips can overpower the material strength of the slip bodies or anchorelements. It is also suggested to use an extra anchor for frac plug slips.
Therefore, there is a requirement to have an anchoring extrusion limiter as well as one that is a frac plug with the same.
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