摘要
目的分析评价TK70和DPC两种涂层油管在鄂尔多斯盆地某油田现场CO_2腐蚀环境中的防腐防垢性能。方法模拟现场CO_2驱油腐蚀工况条件,通过高温高压釜进行耐腐蚀和防垢性能试验,对TK70和DPC两种涂层油管试样(封边和未封边)进行了分析评价,对比了涂层油管试样在高温高压釜试验前后结垢的形貌特征,对腐蚀油管进行腐蚀特征和能谱分析。采用8口油井采出水作为腐蚀介质溶液,进行室内挂片腐蚀试验,并对比TK70涂层和普通J55油管试样的平均腐蚀速率。结果腐蚀油管内壁有较为严重的局部腐蚀现象,能谱分析表明腐蚀产物主要是Fe CO3及少量Ca CO3沉积物。耐腐蚀性能试验表明,两种内涂层均未发生鼓泡和边缘剥落,耐腐蚀性良好。8口油井采出水作为试验介质,测得普通J55油管和TK70涂层油管试样(未封边)的腐蚀速率平均值分别为0.145~0.363 mm/a和0.015~0.059 mm/a。涂层表面结垢不明显,而金属基体表面一侧结垢明显,试验介质溶液的失钙镁率分别为231.77%和796.51%,涂层在一定程度上可以防止结垢。结论 TK70和DPC两种涂层油管具有良好的防腐防垢性能,TK70涂层油管在模拟工况条件下的腐蚀速率满足≤0.076 mm/a的标准要求,在CO_2腐蚀环境下有良好的适用性。
Objective To analyze and evaluate the corrosion resistance and antiscaling performance of TK70 and DPC coated tubings in the CO_2 corrosion environment of a field in Ordos Basin.Methods Corrosion conditions of CO_2 oil displacement in oilfield were simulated.Corrosion resistance test and anti-scaling performance test were conducted by a high temperature and pressure vessel.Samples of TK70 and DPC coating tubings(covered & uncovered tubing) were analyzed and evaluated.The morphologycharacteristics of the two samples before and after high temperature and high pressure vessel test were compared.Then corrosion characteristic and energy spectrum analysis was carried out for corrosion tubing.Water produced in eight wells was used as the solution of the corrosion medium to have an indoor coupon corrosion test.Then comparison was made between the average corrosion rate of TK70 coating and common J55 tubing sample.Results There was a serious local corrosion in the inner wall of the tubing.Energy spectrum analysis showed corrosion products were mainly FeC O3 and a few sediment of CaC O3.Corrosion resistance test showed the two kinds of inner coatings had no blister or edge peeling and had good corrosion resistance.The water produced from the eight wells was used as the test medium.The average corrosion rate of common J55 tubing and TK70 coated tubing specimens(uncovered) was respectively 0.145~0.363 mm/a and 0.015~0.059 mm/a.Scaling on coating surface was not obvious but that on the metal substrate surface was obvious.The loss rate of Ca and Mg of test medium solution was respectively 231.77% and 796.51%.Scaling could be prevented by coating to a certain extent.Conclusion TK70 and DPC coated tubings have good corrosion resistance and anti-scaling performance.Average corrosion rate of TK70 coating tubing meets the required standard value ≤0.076 mm/a in simulated conditions.It enjoys good applicability in CO_2 corrosion environment.
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