Preparation and Evaluation of a Solid Sustained-Release Block Removing Stick for Offshore Unmanned Platforms
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摘要: 酸化解堵是海上油田常见增产措施，但常规酸液体积大且储存风险高，不适用于海上无人平台。为解决海上无人平台解堵困境，以乙二醇、聚乙烯醇、催化剂、黏合剂的缩合产物作为包结材料，以固体解堵剂粉末为被包裹物，制备具有缓释效果的固体缓释解堵棒。考察了反应温度、聚乙烯醇种类和含量、催化剂含量、黏合剂含量、包结材料/被包裹物对产物缓释性能的影响，得到了固体缓释解堵棒的最佳合成条件，评价了固体缓释解堵棒的缓释、溶蚀和腐蚀性能，结果表明，在65℃下固体缓释解堵棒的24 h释酸率为42.3%，对CaCO3的溶蚀率为88.8%，对N80钢片的腐蚀速率为0.57 g/(m2·h)。Abstract: Acid job is a common measure taken to remove formation damage caused by blocking. The acids presently used generally have large volumes and storage risks, and are not suitable for operations on unmanned platforms. To solve this problem, a solid sustained-release block removing stick that release additives in a sustained manner has been developed. This solid sustained-release block removing stick is developed using ethylene glycol, polyvinyl alcohol, catalyst and adhesive as coating materials and powdered block removing agents as the wrapped materials. Factors affecting the performance of the solid sustained-release block removing stick, such as the reaction temperature, the type and content of the polyvinyl alcohol, the contents of the catalyst and the adhesive as well as the coating materials and the wrapped materials, were studied, and the optimum synthetic condition of the stick was obtained. Evaluation of the solid sustained-release block removing stick shows that the rate of acid release of the stick in 24 h at 65℃ is 42.3%, and 88.8% of CaCO3 is dissolved by the released acids. The rate of corrosion of the N80 steel plate by this stick is 0.57 g/(m2·h).
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表 1 注水井统计表
t/d 井口压力/MPa 注水量/（m3/d） 套管压力/MPa 备注 1 8.1 138 0.2 措施前 2 8.1 139 0.2 措施前 3日～4日解堵作业 5 7.2 145 0.2 措施后 6 6.8 152 0.2 措施后 7 6.5 155 0.2 措施后 8 6.2 160 0.2 措施后 9 6.1 165 0.2 措施后 10 6.1 165 0.2 措施后 
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