Abstract
The marginal block Zana oil field is a typical hard-to-produce carbonate reservoir, thin net pay, poor reservoir physical properties, low pressure, strong heterogeneity, bottom water and gas cap risks coexist, and it is difficult to obtain profitable production in conventional development model. In order to realize its high-efficiency development, research on integrated geological and engineering technology was carried out. First, the static and dynamic data analysis combined with pilot well technology was used to accurately determine the target layer, confirm the material basis and guide the horizontal well orientation optimization; Second, after comprehensive consideration of production, cost, performance feasibility, and management after putting into production, an integrated solution of completion and stimulation was recommended; Third, optimized well trajectory control and cementing quality control, improved the drilling rate of the horizontal section and the cementing quality, created wellbore conditions for subsequent stimulation; Fourth, optimized the stimulation method, the treatment scale and parameters, maximized the stimulated reservoir under the premise of avoiding water and avoiding gas; Fifth, Optimize the formula of acid system and liquid combination system, adopt the gas lift flowing and lift integrated pipe column and assisted technique using coiled tubing and nitrogen, realized rapid backflow in low-pressure wells and reduced the secondary damage of reacted acid. Based on the above research, integrated technology of geological and engineering considered geological, reservoir, completion, and stimulation has been applied 14 wells with a success rate of 100%. The average single well production is 10.7 times that of adjacent wells, the cumulative production exceeded 20 × 104t, achieved significant production and economic benefits, and that all provide a technical reference for the development of similar reservoirs.
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