Application of heavy oil cleaning agent in east South China Sea oil field
The eastern South China Sea oilfield has nearly 100 subsea wellhead trees.With the increase of production time,the oil wells appear the"one high and two low"state of extra high water cut,low oil velocity and low production.In order to improve its development effect,improve the degree of reserve utilization and recovery rate,it is necessary to recover the production pipe of the old well and sidetrack a new well to use the remaining oil enrichment area and further improve the recovery degree.However,with the increase of the time of planting the tree,the scaling of the subsea wellhead is serious,and the cleaning work is difficult.The cleanliness of the subsea wellhead becomes the key to the docking and recovery of the tubing,and becomes the main difficulty to recycle the pipe of the old well and sidetrack a new well.The use of efficient scaling technology can significantly improve the efficiency of the abandonment operation of the subsea wellhead.The non-invasive softening treatment procedure of the scaling of the subsea wellhead can improve the success rate of the subsea abandonment and re-completion,and provide valuable experience for the subsequent operation.
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