![]() ![]() the size of the bent sub will depend on the hole size, formation hardness and required deviation. ![]() The number of non-magnetic components can usually be reduced by applying a survey correction algorithm to survey data. Generally the lengths of window to facilitate an effective sidetrack are:Ī suitable assembly will be agreed between the Directional Contractor in consultation with the Drilling Supervisor. The cut should be initiated a minimum of 8 ft above a casing collar. When preparing to cut a casing window care should be taken when making the initial cut, to avoid casing collars and centralisers. Then DRILL and WASH through sufficient cement to allow placement of a second 300 ft plug at a suitable depth for sidetracking Casing Windows Then WAIT a further 12 hours before attempting to kick-offĤ.3 IF the plug does not show signs of compressive strength Then DRESS OFF a further 20-30 ft comparing drillability with that of the original hole DRESS OFF 20 ft, and WEIGHT TEST the plug SET a 300 - 500 ft neat cement plug (Class G in the production hole section) at 17.0 ppg (batch mix the slurry if possible).ģ. ![]() The general procedure for setting sidetracking cement plugs is to:ġ. However, if only medium to hard formations exist at the required sidetrack depth, a high degree of patience is required.Ī controlled ROP should be maintained until confirmation of a successful kick-off is achieved. If possible, the kick-off location should be selected where a soft or soft to medium formation is present in order to increase the chances of obtaining a successful kick-off. The most effective BHA configuration to achieve a successful sidetrack kick off is a mudmotor with bent sub. ![]() This lateral force should be provided by the geometry of the BHA forcing the cut on the side of the hole. The main requirements in sidetracking a well is the development of a lateral force to allow the bit to cut on the side of the hole. Wells may require sidetracking in order to re-drill the well to a new target, sidetrack past a fish or sidetrack due to hole problems. ![]()
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