Through tubing perforating guns that are deployed by means of electric line has been the most economic perforation technique to provide connectivity between the pay zone and the wellbore in cased hole wells. Conventional E-line guns was the most common type of guns used, however during the last two decades various types of guns has been raised to improve the perforation efficiency. In offshore operating companies including Gulf of Suez Petroleum Company "GUPCO" rig-less perforation has been proved to be the cheapest stimulation method, in case of re-perforating an existing interval, when compared to coiled tubing jobs that requires rig-assist or even acid bull-heading which will need at least a fully prepared vessel for chemical tank storage in addition to the highly cost acid itself. Moreover, it is much cheaper than tubing conveyed type that is always accompanied with rig work-over. So using dynamic under-balance gun has become a smart solution that will recover all debris in perforation tunnels in order to achieve the maximum oil recovery. When using conventional guns for re-perforating existing intervals there is a large contrast in the degree of success, and it was obvious that in law draw-down wells re-perforating the low productivity intervals has minor improvement and in most cases it was useless this was latterly explained to be resulted from the insufficient underbalance. In this work, implementation of a specific type of guns (Dynamic under-balance perforating guns) will be presented. The mentioned type generates in-situ underbalance creating an instantaneous and controlled surge of formation fluids into the well, which cleans the perforation tunnels up to 97% and enhances the well's productivity. The dynamic under-balance perforation technique has been tried in four wells that seemed from production logs are contributing with little share or sometimes not sharing at all which has been attributed to skin effect. After re-perforation, the results were outstanding with an increase of 20–40% in the total liquid rate and incremental increase in the oil rate with more than 2000 BOPD in the mentioned wells. The stated results revealed that the oil-bearing intervals are now competing with the high productivity high water cut intervals which considered a valuable gain with considerable very low job cost. The new guns type has proved its success especially when compared its results with the previous re-perforation jobs using conventional guns in the same wells where the incremental oil gain was much less. It can be used as a cheap alternative for near well-bore stimulation jobs especially for offshore platform wells.
Scale deposition is a major concern in Gulf of Suez Fields, variations in water composition and operating conditions resulted in the deposition of full spectrum of scale depositions in different fields. The common practice in GOS is to prevent scale deposition by periodical scale inhibition treatment. However the field experience showed variation in efficiency of inhibition under different operating conditions which results in some cases in scale deposition. In this case we are obliged to react and do intervention to clean out these wells either with chemical dissolution or coiled tubing clean out which is sometimes becomes costly and stand clueless in front of hard scale. Typically, in offshore operating fields, rig-less solutions is the optimum. A simple, innovative, and cost effective Torque action debris breaker tool is a new rig-less solution deployed on slick-line unit. The tool can be run at different sizes to allow for optimum scale removal. Activation is achieved via downward jarring action. The TADB tool applies a new operating concept different from milling. The tool consists of a sharp knife with a broach body. The operating mechanism uses the jarring down action in order to apply jackhammer force on the scale accumulation, which allows decreasing the bond between different layers of scale and between the scale and tubing. Another advantage is having the knife rotating after each jar action, which allows this force to be applied on different positions of scale accumulation adding more efficiency. The tool was first deployed in Egypt in one of the challenging oil wells offshore gulf of suez, which has a historical scale deposition issues "mainly hard deposition of zinc & lead sulfides". several trials were performed to clean out the well historically using coiled tubing operations using barge assist, it took 2 months of operation to achieve partial success & the well was worked over later. The Torque Action debris breaker was tried against the same scale type and found successful. allowing the well to be drifted with 2.7" compared with 2.25" before the job. The operation cost is by no means comparable to the previous cost of coiled tubing operations. Following this wells three other wells were intervened using the same tool and showed much better progress of scale clean out in comparison with other slick-line tools & historical coiled tubing performance in these wells. The implementation of this technology has generally optimized operating cost compared to lengthy and costly CT/WO operation minimizing footprint, equipment, manpower, job duration, and provide a more environmentally friendly solution.
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