DCT

4:26-cv-03516

Energy IP LLC v. Tendeka Inc

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I. Executive Summary and Procedural Information

  • Parties & Counsel:
  • Case Identification: 4:26-cv-03516, S.D. Tex., 05/01/2026
  • Venue Allegations: Venue is alleged to be proper in the Southern District of Texas because Defendant Tendeka, Inc. has its principal place of business in Houston, and both defendants are alleged to have made, used, sold, or offered for sale accused products in the district.
  • Core Dispute: Plaintiffs allege that Defendants' "SwellPlug" technology, a method for sealing oil and gas well perforations, infringes a patent related to sealing perforation tunnels with a swelling elastomer material.
  • Technical Context: The technology concerns methods for sealing off old perforations in oil and gas wells, which is a necessary step before conducting subsequent hydraulic fracturing operations ("refrac") in new zones of the well.
  • Key Procedural History: The complaint details a significant business history between the parties, starting with a 2017 non-disclosure agreement. This was followed by a 2021 license agreement for the patent-in-suit and related technology, which was terminated in May 2022. The complaint alleges that after the termination, Defendants launched a "strikingly similar, if not identical" competing service, misappropriating Plaintiffs' intellectual property, including trade secrets and copyrighted marketing materials, in addition to infringing the patent.

Case Timeline

Date Event
2017-06-26 Priority Date for '880 Patent
2017-10-27 Mutual Non-Disclosure Agreement between WWIP (Plaintiff's predecessor) and Swellfix UK (Defendant's parent)
2020-09-29 U.S. Patent No. 10,787,880 Issued
2021-06-03 License Agreement between EIP and Tendeka
2022-02-01 TAQA acquires Tendeka (approximate date)
2022-05-16 Tendeka terminates the License Agreement
2024-05-01 Supply Agreement between EIP and Tendeka
2025-01-29 Tendeka terminates the Supply Agreement
2025-03-10 Plaintiff EIP sends cease and desist letter to Defendants
2026-05-01 Complaint Filing Date

II. Technology and Patent(s)-in-Suit Analysis

  • Patent Identification: U.S. Patent No. 10,787,880, "Method for Sealing Perforation Tunnels with Swelling Elastomer Material," issued September 29, 2020.
  • The Invention Explained:
    • Problem Addressed: Traditional methods for sealing old perforations in a wellbore before re-fracturing a new zone-such as using bridge plugs or cement-are described as "expensive," "complex," and "difficult to control" '880 Patent, col. 1:45-60 These methods add significant cost and complexity to the process of recompleting a well.
    • The Patented Solution: The invention proposes a method of sealing these perforation tunnels by pumping a mixture of a carrier fluid and an "expandable material" (e.g., swellable rubber granules) into the well '880 Patent, abstract This "expandable fluid mixture" is forced into the perforation tunnels, where the material becomes trapped, swells, and forms plugs that seal the tunnels '880 Patent, col. 4:21-29 '880 Patent, FIG. 3 The method relies on monitoring and controlling pressure to ensure the material is emplaced correctly and cures into an effective seal '880 Patent, col. 5:4-48
    • Technical Importance: This approach offers a potentially more cost-effective and less complex alternative to mechanical plugs or cement for isolating wellbore zones, enabling operators to more economically increase production from older wells '880 Patent, col. 1:38-44
  • Key Claims at a Glance:
    • The complaint asserts infringement of "one or more claims" of the '880 Patent Compl. ¶53 Independent claim 1 is representative of the patented method.
    • Independent Claim 1:
      • pumping an initial volume of fluid into the well;
      • mixing expandable material into a carrier fluid to form an expandable fluid mixture;
      • pumping the expandable fluid mixture into the well to force the expandable material into the perforation tunnels in the well; and
      • holding the expandable material under a hold pressure of from about 1,000 psi to about 3,000 psi in the perforation tunnels for a cure period to form perforation plugs.
    • The complaint reserves the right to assert other claims, which could include dependent claims or other independent claims like claim 11 Compl. ¶53

III. The Accused Instrumentality

  • Product Identification: The accused instrumentality is Defendants' "SwellPlug technology," a service for sealing and isolating existing well perforations Compl. ¶12 Compl. ¶49
  • Functionality and Market Context:
    • The complaint alleges that the SwellPlug service is a "perforation-filling and sealing process... utilizing swellable rubber" Compl. ¶12
    • Based on Defendants' marketing materials cited in the complaint, SwellPlug is described as a "cost effective, low complexity, patent protected method that isolates existing perforations" by using "field proven swelling elastomer technology" Compl. ¶49
    • The complaint alleges the SwellPlug process is "remarkably similar, if not identical" to Plaintiffs' "SwellFrac IP" and the methods covered by the '880 Patent Compl. ¶48 The core of the allegation is that Defendants, after terminating a license to the '880 Patent, launched a functionally identical service under a new name Compl. ¶12 Compl. ¶36 Compl. ¶47
    • The complaint includes a screenshot from a TAQA case history for its "SwellPlug ZI" service which, in the description of the solution, accidentally refers to using "SwellFrac material," the name of Plaintiffs' technology Compl. ¶52 This visual is presented as evidence that the accused process is identical to the Plaintiffs' process.

IV. Analysis of Infringement Allegations

'880 Patent Infringement Allegations

Claim Element (from Independent Claim 1) Alleged Infringing Functionality Complaint Citation Patent Citation
pumping an initial volume of fluid into the well The complaint does not provide sufficient detail for analysis of this specific element, though it is a conventional preparatory step in such well interventions. col. 4:50-58
mixing expandable material into a carrier fluid to form an expandable fluid mixture Defendants' SwellPlug process is alleged to use "swellable rubber" and a "swelling elastomer technology," which is mixed and pumped into the well to seal perforations, mirroring the patented method Compl. ¶12 Compl. ¶49 ¶12; ¶49 col. 4:45-49
pumping the expandable fluid mixture into the well to force the expandable material into the perforation tunnels in the well Defendants' marketing materials allegedly describe pumping a "SwellPlug ZI pill" to seal a leaking interval Compl. ¶52 A side-by-side visual comparison in the complaint purports to show Plaintiffs' and Defendants' promotional videos depicting a nearly identical process of material (in red) being forced into and filling perforation tunnels Compl. p. 13 ¶12; ¶52; p. 13 col. 5:4-13
holding the expandable material under a hold pressure of from about 1,000 psi to about 3,000 psi in the perforation tunnels for a cure period to form perforation plugs The complaint alleges Defendants' process involves applying pressure to allow the material to swell and seal, asserting that "key principles of physics... render it impossible" for Defendants to seal perforations with this technology without infringing Compl. ¶47 One of Defendants' own case studies cited in the complaint references injection pressures reaching 9,900 PSI and allowing material to swell for 120 minutes Compl. ¶52 ¶47; ¶52 col. 5:20-34
  • Identified Points of Contention:
    • Technical Questions: A primary question is whether the specific operational parameters of the accused SwellPlug process fall within the ranges claimed in the patent. For example, does the SwellPlug process "hold" pressure in the manner and for the duration required by the claims, or could Defendants argue their process works differently (e.g., via a different chemical or pressure mechanism)? The complaint's allegation of physical impossibility of non-infringement suggests this will be a central battleground Compl. ¶47
    • Scope Questions: The case may turn on the scope of the term "expandable material." While the patent provides examples, the defendants might argue their specific elastomer compound is not covered by the claims as properly construed.
    • Evidentiary Questions: The complaint heavily relies on Defendants' marketing materials, including alleged copies of Plaintiffs' videos and a case study that appears to mistakenly reference Plaintiffs' "SwellFrac" trade name Compl. ¶13 Compl. ¶52 A key question will be how much weight this evidence is given in demonstrating that the process as actually practiced by Defendants infringes the patent claims, versus merely showing copying of marketing concepts.

V. Key Claim Terms for Construction

  • The Term: "holding the expandable material under a hold pressure"
  • Context and Importance: This limitation defines the final, critical step of the claimed method where the seal is formed. The infringement analysis will likely focus on whether the pressure application in the accused SwellPlug process constitutes "holding" under "a hold pressure" as construed from the patent. Practitioners may focus on this term because the prior business relationship and allegations of direct copying suggest the technical processes are very similar, making slight differences in how pressure is applied and maintained a potential area for non-infringement arguments.
  • Intrinsic Evidence for Interpretation:
    • Evidence for a Broader Interpretation: The summary of the invention describes the step more generally as "holding the expandable material under a hold pressure... to form perforation plugs" without tying it to a specific, constant value '880 Patent, col. 2:4-7 This could support an interpretation where any application of sufficient pressure to keep the material in place while it cures meets the limitation.
    • Evidence for a Narrower Interpretation: The detailed description and the claim itself provide a specific pressure range: "from about 1,000 psi to about 3,000 psi" '880 Patent, claim 1 The specification further describes reducing pump rates to a "hold" pressure that is "maintained in the wellbore" and held for a "desired cure time" of "between about 8 and about 12 hours" '880 Patent, col. 5:20-34 A defendant could argue this language requires maintaining a relatively stable pressure within a specific range for a multi-hour period, and that a process with different pressure profiles would not infringe.

VI. Other Allegations

  • Indirect Infringement: The complaint alleges direct and/or indirect infringement Compl. ¶53 While specific facts for indirect infringement are not separately detailed under the patent count, the complaint's allegations that Defendants' website, promotional materials, and technical papers instruct customers and operators on how to use the "SwellPlug technology" could form the basis for an inducement claim Compl. ¶49 Compl. ¶50 Compl. ¶51
  • Willful Infringement: The complaint lays a strong foundation for a willfulness allegation. It alleges that Defendants had pre-suit knowledge of the '880 Patent through the explicit license agreement they entered into in 2021 and subsequently terminated Compl. ¶9 Compl. ¶36 The complaint also references a specific meeting where Tendeka's president allegedly told the inventor he thought Tendeka could "get around" the '880 Patent, which could be interpreted as evidence of deliberate infringement Compl. ¶43

VII. Analyst's Conclusion: Key Questions for the Case

This case appears to be driven by a dispute between former business partners, involving allegations that extend beyond simple patent infringement. The key questions for the court will likely be:

  • A core issue will be one of technical and functional identity: Given the parties' prior licensing relationship and the evidence of copied marketing materials, is the accused "SwellPlug" process functionally identical to the method claimed in the '880 Patent? The plaintiff's assertion that non-infringing operation is a "physical impossibility" will require significant evidentiary support to overcome any asserted technical distinctions.
  • A second key question will be one of claim scope and construction: Can the defendant successfully argue that its specific elastomer composition or pressure application protocol falls outside the scope of the patent's claims, particularly the "holding... under a hold pressure" limitation? The outcome will depend on whether the court adopts a broader, more functional interpretation or a narrower one tied to the specific embodiments described in the patent.
  • Finally, a central question will be the impact of alleged misconduct: How will the allegations of trade secret misappropriation, copyright infringement, and bad-faith business dealings (e.g., the alleged attempt to "get around" the patent) influence the patent infringement analysis, particularly on the issues of willfulness and damages?
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