Method and apparatus for cleaning an oil and gas well riser assembly with multiple tools simultaneously

A method of cleaning an oil and gas well riser section that has a central larger diameter tubular member having a flow bore and a plurality of smaller diameter tubular members connected to the central larger diameter tubular member, each smaller diameter tubular member having a flow bore, the method comprising the steps of:

• a) placing a fitting on an end portion of the riser section, the fitting covering an end of the larger diameter tubular member and the ends of the smaller diameter tubular members, wherein the fitting has multiple openings including one or more centrally located openings and a plurality of circumferentially spaced apart outer openings that are spaced radially away from each of the one or more centrally located openings, said fitting having a drain opening;
• b) inserting a first cleaning tool through the centrally located opening and into the larger diameter tubular member, wherein said first cleaning tool cleans the inside surface of the larger diameter tubular member;
• c) inserting one or more second cleaning tools through one or more of the outer openings and into one or more of the smaller diameter tubular members, wherein said second cleaning tool cleans the inside surface of the smaller diameter tubular member;
• and
• d) removing fluid from the cleaning operations of steps (a) through (c) via the drain opening wherein the outer openings are positioned along a curved line that is radially spaced outwardly of the centrally located openings, said curved line traversing each of said smaller diameter tubular members.