b'Productive WellsProductive wells consist of producing wells and wells capable of production, including wellsawaiting connections. For wells that produce both oil and gas, the well is classified as an oil well. Thefollowing table sets forth the number of productive oil and gas wells in which we held an interest atDecember 31, 2018:Productive ProductiveOil Wells Gas Wells TotalGross Net Gross Net Gross NetGhana . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 9.00 41 9.00U.S. Gulf of Mexico . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 3.02 17 3.02Kosmos Total(1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 12.02 58 12.02Equity Method Investment(2)(3) . . . . . . . . . . . . . . . . . . . . 96 38.78 96 38.78Total. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154 50.80 154 50.80(1) Of the 58 productive wells, 20 (gross) or 3.53 (net) have multiple completions within the wellbore.(2) Represents our 50% interest in KTIPI.(3) Of the 96 productive wells, 6 (gross) or 2.42 (net) have multiple completions within the wellbore.Drilling activityThe results of oil and natural gas wells drilled and completed for each of the last three years wereas follows:Exploratory and Appraisal Wells(1) Development Wells(1)Productive(2) Dry(3) Total Productive(2) Dry(3) Total Total TotalGross Net Gross Net Gross Net Gross Net Gross Net Gross Net Gross NetYear Ended December 31, 2018Ghana . . . . . . . . . . . . . . . . . 3 0.80 3 0.80 4 0.89 4 0.89 7 1.69U.S. Gulf of Mexico(4) . . . . . . . 1 0.55 1 0.55 1 0.55Senegal . . . . . . . . . . . . . . . . 1 0.60 1 0.60 1 0.60Suriname . . . . . . . . . . . . . . . 2 1.20 2 1.20 2 1.20Total . . . . . . . . . . . . . . . . . . 6 2.60 6 2.60 5 1.44 5 1.44 11 4.04Year Ended December 31, 2017Ghana . . . . . . . . . . . . . . . . .Mauritania . . . . . . . . . . . . . . 2 0.56 2 0.56 2 0.56Total . . . . . . . . . . . . . . . . . . 2 0.56 2 0.56 2 0.56Year Ended December 31, 2016Ghana . . . . . . . . . . . . . . . . . 7 1.19 7 1.19 7 1.19Total . . . . . . . . . . . . . . . . . . 7 1.19 7 1.19 7 1.19(1) As of December 31, 2018, seven exploratory and appraisal wells have been excluded from the table until a determination is made ifthe wells have found proved reserves. Also excluded from the table are 14 development wells awaiting completion. These wells areshown as Wells Suspended or Waiting on Completion in the table below.(2) A productive well is an exploratory or development well found to be capable of producing either oil or natural gas in sufficientquantities to justify completion as an oil or natural gas producing well. Productive wells are included in the table in the year theywere determined to be productive, as opposed to the year the well was drilled.(3) A dry well is an exploratory or development well that is not a productive well. Dry wells are included in the table in the year theywere determined not to be a productive well, as opposed to the year the well was drilled.(4) Represents contributions from the U.S. Gulf of Mexico after the acquisition date.30'