Technology of salt resistance and acid gas pollution resistance drilling fluid for carbonate reservoir in sour gas field
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摘要: 为预测酸性气田钻井作业所用钻井液中酸性气的侵入量,根据地质参数和钻井参数计算了现场酸性气侵入量和除硫剂碱式碳酸锌与二氧化碳清除剂氧化钙的加量。为评价酸性气污染对钻井液性能的影响,设计了一套酸性气对钻井液污染的室内评价方法——气瓶压力控制灌注法,并根据理想气体状态方程,推导了灌注不同浓度酸性气体所需要的灌注压力计算公式。室内采用此方法评价了H2S、CO2对适合于南帕斯气田碳酸盐岩储层无黏土相NaCl盐水钻井液和无固相甲酸钾有机盐钻井液体系性能的影响,实验表明两套钻井液体系具有能够抗200 mg/L H2S、1000 mg/L CO2酸性气污染的能力,以及抗灰岩钻屑、地层盐水和各种盐相污染能力,且具有优越的流变性能、润滑性能、防腐蚀性能和储层保护效果,能够满足南帕斯酸性气田碳酸岩储层安全、快速、高效钻井。Abstract: In order to predict the volume of acid gas intruded into drilling fluid for drilling in sour gas field, the acid gas invaded volume and dosage of sulfide scavenger basic zinc carbonate and carbon dioxide scavenger calcium oxide were calculated on-site according to the geological parameters and drilling parameters. To evaluate the impact of acid gas pollution on the drilling fluid performance, an indoor evaluation method "gas perfusion by control cylinder pressure" was designed. And then the required perfusion pressure formulas for infusing different concentration of acid gas were developed according to ideal gas state equation. Using this experiment method we evaluated the influence of acid gas H2S and CO2 on clay-free NaCl brine drilling fluid system and solid-free potassium formate organic salt drilling fluid system that suit for carbonate reservoir of sour gas field. The results show that the two series drilling fluid system have the resistance capacity of 200 mg/L H2S, 1000 mg/L CO2 acid gas pollution, and have good ability of anti-lime stone cuttings, anti-formation brine water and various salt pollution tolerance. In addition, these two systems also have excellent rheological properties, lubricity, anti-corrosion and reservoir protective effects. The two series drilling fluid system can make sure the sour gas field carbonate reservoir safe, fast and efficient drilling.
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[11]王荐,张荣,聂明顺,等.弱凝胶钻井完井液研究与应用[J].钻井液与完井液,2008,25(6):6-7.
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[13]张岐安,徐先国,付建国,等.有机盐钻井液在水平井BHW01井的应用[J].石油钻采工艺,2010,32(2):34-37.
[14]于志纲,张军,彭商平,等.可降解甲酸盐钻井液的研究与应用[J].石油钻采工艺,2010,32(6):53-56. [1]JAFAR A, HOSSAIN R B, MOHAMMAD R K. Geochemistry and origin of the world’s largest gas field from Persian Gulf, lran[J]. Journal of Petroleum Science&Engineering, 2006: 161-175.
[2]BASHARI A. Khuff formation Permian-Triassic carbonate in the Qatar-South Fars arch hydrocarbon province of the Persian Gulf[J]. Middle East Review, 2005: 43-50.
[3]胡安平,周庆华tt世界上最大的天然气田——北方-南帕斯气田[J].天然气地球科学,2006,17(6):32-35.
[4]程存志,罗淮东,董大康,等.伊朗MIS油田高含硫裂缝性超低压油层钻井液技术[J].钻井液与完井液,2009,26(5):32-35.
[5]姜文.川东北海相碳酸盐岩高含硫地层安全高效钻井液技术研究[D].成都:西南石油大学,2006.
[6]耿东士,何纶,李道芬,等.钻井液中硫化氢的危害及其控制[J].钻井液与完井液,2007,24(S0):1-3.
[7]刘翔,罗宇峰,王娟,等.钻井液CO2污染的测试方法及处理技术[J].钻采工艺,2009,32(6):79-81.
[8]崔应中,向兴金,吴彬,等.抗酸性气污染高密度水基钻井液体系性能研究[A]//2010年全国钻井液完井液技术研讨会论文集[C].贵阳:2010:109-115.
[9]崔应中,向兴金,吴彬,等.硫化氢对钻井液污染情况的室内实验研究[J].钻井液与完井液,2009,26(2):75-77.
[10]谢克姜,胡文军,方满宗.PRD储层钻井液技术研究与应用[J].石油钻采工艺,2007,29(6):99-101.
[11]王荐,张荣,聂明顺,等.弱凝胶钻井完井液研究与应用[J].钻井液与完井液,2008,25(6):6-7.
[12]谢俊,向兴金,王荐,等.冀东油田水平井钻井液体系的研究与应用[J].精细石油化工进展,2009,10(8):9-11.
[13]张岐安,徐先国,付建国,等.有机盐钻井液在水平井BHW01井的应用[J].石油钻采工艺,2010,32(2):34-37.
[14]于志纲,张军,彭商平,等.可降解甲酸盐钻井液的研究与应用[J].石油钻采工艺,2010,32(6):53-56. -

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