Located in eastern Venezuela, the Furrial field is composed of three main reservoirs. Reservoir characteristics include 8,300 million barrels of original oil in place and a hydrocarbon column consisting of crude with asphaltenes that vary from 10 to 30° API. The field has 147 active wells, of which 45 are water-injector wells and seven are gas-injector wells. Wells drilled in the area range from approximately 12,000 to 17,000 ft. Crude oil with asphaltenic tar mats (because of its chemical features) was identified in the field, which establishes a vertical structural seal bordering traditional reservoirs. Major problems in the reservoirs include emulsions, paraffin and asphaltene plugging, water cuts, and water channeling. For several years, the operator has been developing a program to convert wells that cannot be produced naturally to gas-lift wells (conventional, tubing punch, and coiled lift) to increase recovery potential. Although the system is a single, economic, and fast-lifting system, it requires a continuous flow of high-pressure gas.

The productivity workflow presented in this paper required a multidisciplinary team to analyze, select, and rank recommended well candidates for intervention and production optimization, evaluating all aspects pertaining to well productivity and reserves to objectively identify possible alternatives for increasing production. The process produced a list of wells ranked by their potential to increase production. The intervention plan for the wells were then defined and ranked based on technical and economic criteria.

This paper presents the successful application of this methodology in a mature field in the Venezuelan Oriente Basin and demonstrates how the method impacted and improved well productivity in this field by over 27 times more than the base case.

You can access this article if you purchase or spend a download.