¹ Underwriters Subscribing Severally To Policy Number TMU – 407387 as “Atlantic.” No. 19-30182 relevant here, the “commingled” exception only applies to “gas gathering lines.” LA. REV. STAT. § 9:2780.1(A)(2)(b)(ii). A “gas gathering line” is a term of art that is not defined in the LAIA. But Louisiana courts have used the term in conjunction only with lines that run amongst wells or between production facilities and the first processing plant. See Spanish Lake Restoration, LLC v. Petrodome St Gabriel II, LLC, 186 So.3d 230, 232 (La. Ct. App. 2016) (noting the defendant “installed an aboveground pipeline in the form of a natural gas gathering line that runs from the Section 13 well pad”); Warren Energy Resources, Inc. v. Louisiana Tax Comm’n, 825 So.2d 572, 577 (La. Ct. App. 2002) (stating gas gathering lines delivered “production . . . to one gas plant”); cf. Magnolia Petroleum Co. v. Sandlin, 137 So. 595, 596 (La. Ct. App. 1931). Moreover, the Louisiana courts’ usage comports with the definition adopted by the American Petroleum Institute (API) and the Federal Government. See 49 C.F.R. §192.8; API Recommended Practice 80, “Guidelines for the Definition of Onshore Gas Gathering Lines” (April 2000). Against this backdrop of consistent usage, Phillips 66 offers no alternative definition. Cf. ANTONIN SCALIA & BRYAN A. GARNER, READING LAW § 54. And it is undisputed that the Phillips 66 pipeline does not travel from a either a well or production facility to an initial processing facility. Instead, the pipeline runs between processing facilities. Therefore, it is not a gathering line as that term is used in the statute. Third, Phillips 66 argues that this interpretation of the LAIA runs afoul of another Louisiana statute—the Louisiana Oilfield Anti-Indemnity Act (“LOAIA”). LA. REV. STAT. § 9:2780. The LAIA specifically requires that courts consider the LOAIA and ensure that they do not “add to” or “subtract from” its provisions. LA. REV. STAT. § 9:2780.1(E). But LOAIA is inapplicable. That statute, by its own terms, applies only to “agreements pertaining to wells.” LA. REV. STAT. § 9:2780; see Johnson v. Amoco Prod. Co., 5 F.3d 949, 954 (5th Cir. No. 19-30182 1993). A natural gas pipeline does not pertain to a well when the gas has been so commingled that it “can no longer be identified with a particular well.” Johnson, 5 F.3d at 954. Here, Phillips 66’s own evidence shows that its pipeline travels from a facility where gas is commingled— sourced “from multiple different offshore production and gathering facilities”—to another processing plant. Notably, Phillips 66 nowhere suggests that this commingled gas can “be identified with a particular well,” as required by LOAIA. Johnson, 5 F.3d at 954. As a result, LOAIA has not been added to or subtracted from in our analysis. It just does not apply. Fourth, Phillips 66 argues that Atlantic owed a duty to defend it from the workers’ claims. In Louisiana, insurers only owe a duty to defend to their insured. See Meloy v. Conoco, 504 So.2d 833, 838 (La. 1987). Blanchard is insured by Atlantic. And Blanchard agreed to add Phillips 66 as an “additional insured.” But, as discussed above, that agreement is void under the LAIA. Since there was no basis in law for Atlantic to cover Phillips 66 as an insured, Atlantic had no duty to defend them. Cf. Edwards v. Continental Cas. Co., 841 F.3d 360, 363 (5th Cir. 2016) (stating that the duty to defend does not apply when a “petition unambiguously excludes coverage”). Finally, Phillips 66 claims that the district court erred by engaging in “factfinding” or looking at “extraneous evidence.” It did not. The court considered the record, evaluated the statutes, and consulted the relevant legal authorities. We have done the same and see no error. AFFIRMED.