Ownership of Solution And Evolved Gas: Technical And Legal Perspectives
Authors: Carlson M.R. , Friesen J.G. 
Published: March 2010

Abstract
Split title leases, in which oil rights and gas rights are divided, have resulted in disputes over solution gas ownership. A recent judgment of the Alberta Court of Appeal in Prism Petroleum Ltd. et al. vs. Omega Hydrocarbons Ltd.(1) affirmed earlier decisions including the Borys(2) case.
Relevant engineering and legal issues are discussed. The paper has been written as a "bridge" between engineering and law. In order to accomplish this objective, background information has been provided so that the material can be readily understood by those in either profession. This will, of course, be at the expense of including some basic material, which would not normally be included in a technical or legal paper.
Engineering issues include terminology, PVT behaviour, producing mechanisms, the significance of an initial GOR, how gas is evolved in the reservoir, concurrent production, classification of oil and gas wells, enhanced recovery requirements, solution gas conservation, and the effects of offset production. The impracticality of periodic testing of reservoir conditions is outlined.
Legal issues include previous case law, the specific wording of the lease considered in the recent decision and its interpretation, and issues where some uncertainty remains. These issues include the responsibility for costs of drilling, completion, surface facilities and operations where there has been a trespass or conversion, the related issue of unjust enrichment, estoppel (by deed, conduct and representation) and limitation periods. It is suggested that improvements could be made to agreements to more clearly define oil and gas rights.

Organization
This paper represents the experience gained in preparing for a specific litigation case. It has, however, been written to address problems that can arise in general. The organization is therefore as follows:Split titles and how they arise.A basic explanation of the relevant engineering issues.The general legal issues are presented, followed by an explanation of these issues.The background, legal process, technical preparation, trial results and appeal decisions of Prism et al. vs. Omega(1) are discussed in detail.A number of issues that have not been resolved by the Courts are discussed.Recommendations and Conclusions are made.
This paper has a number of purposes. First, to report the results of a recent decision. Second, we hope to show some of the problems that can occur with split title leases and to provide an overview of a complex issue. Finally, we recommend some changes which may mitigate some of these problems.
The paper is multi-disciplinary covering both legal and engineering issues. Wherever possible, an attempt has been made to make the paper suitable to be read by either discipline. The paper is not a substitute for legal or technical advice, and readers should seek such advice in relation to the unique circumstances that may be applicable to their work or cases.

Introduction
Split titles, where the natural gas rights and the petroleum (oil) rights have been separated, occur from three sources: