Range Resources has increased oil production of its Atzam well in Guatemala to 140 barrels per day (bpd) compared to a previous 100 bpd.Production remains restricted 8/64ths choke due to limited onsite storage tank capacity, until offtake contracts in place.Negotiations are underway with potential offtake parties, including a global oil and gas company, for current and future Atzam oil production.The well is estimated to have a flow rate in-excess of 1,000 bpd on an open choke based on flow rates achieved from various choke sizes up to 32/64ths since initial production.Range owns indirect attributable interest of 23.93% in the Atzam project, consisting of a 19.9% interest in Citation Resources and a further 10% interest in the project.Shares in Range rose 0.41% to 2.46p at 10:16 on Monday.