Analysis of Reasons for Low Efficiency of Oil Wells in Offshore Low-Permeability Oilfields and Measures to Remove Blockages
In order to identify the reasons for low production and efficiency of oil wells in offshore X oilfield, and further improve the development efficiency of offshore low-permeability oilfield, based on the analysis of the basic overview and development status of the target oilfield, indoor experiments were conducted to analyze the causes of oil well damage in the target oilfield, and a new composite plugging removal system was developed. The indoor experimental results showed that water lock damage, wellbore fluid damage, organic matter deposition damage, and scaling damage caused by the mismatch between injected water and formation water were the main reasons for the low efficiency of offshore X oilfield oil wells. The new composite blockage removal system mainly consisted of organic blockage removal fluid, inorganic blockage removal fluid, and displacement fluid. The organic blockage removal fluid had a good dissolution effect on organic scale, while the inorganic blockage removal fluid had a strong dissolution ability on on-site inorganic blockage materials and good corrosion inhibition performance. The composite unblocking system had a good unblocking effect on the polluted core, and the permeability recovery value of the core after unblocking was over 97％. The on-site application results showed that the use of a composite unblocking system in well A1 had significant unblocking effect, with a daily oil increase of over 60 m3. The measures had a longer effective period and better construction effect.
Offshore low permeability oil fieldsLow production and low efficiencyReservoir damageComposite unblocking systemUnblocking effectViscosityPermeability
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