pressure control valves in the lrp a reduction in size from 6 u2033 to 5 u2033 riser may result in a weight saving of more than 30 it is therefore important to choose the right size of the equipment for the work to be done since this increases the number and choice of vessels capable of handling the work to gain access to the well the pressure control assembly lrp is first connected to the christmas tree then the workover riser and edp are connected to the lrp a second pressure control assembly surface bop is attached to the top of the workover riser a tool is run in to remove the entire plug 10 to open the well if only smaller tools are scheduled to be used during intervention a smaller lrp and workover riser can be used a tool is run in to engage with flange 58 to pull the inner plug 50 from the main plug 30 the method of the invention therefore allows for a wider choice of both equipment and vessels and allows the equipment to be more specifically tailored to the work when work is planned in a well it will first be analysed what type of work is necessary if only small tools are to be used the choice of workover equipment will be chosen accordingly and a suitable vessel commissioned after connecting the equipment to the well a tool is run in to release and retrieve the plug if the job is light only the inner plug will be retrieved through the smallbore riser the work in the well is completed and the equipment disconnected from the well if it is desired to use larger tools again a suitable size of workover riser and vessel is chosen after.