Texas-based EnCap Flatrock Midstream is considering a sale of gas pipeline operator Momentum Midstream in a deal that could fetch $5 billion. According to a Bloomberg report citing unnamed sources, the venture capital firm is currently talking with financial advisers to find a buyer. The sources noted that talks are in their early stages and EnCap Flatrock Midstream may eventually decide against a sale. If it does sell Momentum Midstream, however, it would make one of the largest deals in the oil and gas pipeline space, after the Brookfield Infrastructure…