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.Click here to view the patent on USPTO website.
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- What are the technical terms and keywords that describe the essence of an invention? A technical dictionary will help you find the appropriate terms.
2. Utilize these terms to locate pertinent Cooperative Patent Classifications for your invention at the Classification Text Search Tool. If you’re unable to locate the appropriate classification to describe your invention, scan through the Schemas of classes (class schedules). If you don’t see any results using the Classification Text Search, you might consider substituting your words that describe your invention with synonyms.
3. Check the CPC Classification Definition for confirmation of the CPC classification you’ve found. The hyperlink to a CPC classification definition will be given in the event that the title of the classification is a blue square with a “D” to its left. CPC classification definitions can help identify the specific classification’s scope, so you are certain to pick the most appropriate. In addition, these definitions can include search tips and other suggestions that may be useful for further study.
4. The Patents Full-Text Database and the Image Database allow you to retrieve patent documents that include the CPC classification. You can review and narrow down the most relevant patent documents by looking first at abstract and drawings representative of.
5. Use this selection of the most relevant patent publications to look at each in detail for similarity to your own invention. Be sure to read the specification and claims. Refer to the applicant and patent examiner to obtain additional patents.
6. Search for patent applications that have been published using the CPC classification you chose in Step 3 from the Applications Full-Text and Image Database. You can apply the same search strategy as Step 4, narrowing your search results to the most pertinent patent applications by examining the abstract and representative drawings on each page. After that, you must review the patent applications that have been published carefully, paying special attention to the claims as well as other drawings.
7. Find other US patents by keyword searching in PatFT or AppFT databases, classification search of non-U.S. patents according to below, and searching for non-patent literature disclosures of inventions using internet search engines. For instance:
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