卤水钻井液在青海钾盐矿层钻探中的应用研究
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摘要
在青海柴达木盆地卤水钾盐钻探中,钻遇地层为新近系干盐湖沉积地层,上部孔段岩性是粘土层,其特征是水敏性强,在施工中产生易缩径、造浆,下部孔段为砂砾碎屑岩,孔壁易出现掉块、坍塌等现象,给钻探施工带了困难。针对钻遇地层特点,采取先在室内进行卤水钻井液实验,选择出适合的钻井液配方,再到野外现场应用试验的研究方法。为了评价卤水钻井液的性能,选择淡水防塌钻井液、不饱和盐水钻井液、饱和盐水钻井液、卤水钻井液四种不同种类的钻井液进行钻井液抑制性、泥皮质量和润滑性能对比测试,结果表明,卤水钻井液性能优于其他类型钻井液。该钻井液的研制,有效保持了孔壁稳定和较高的岩心采取率,并取得了较好的经济技术效果。
In the drilling of halogenic sylvinite in Qaidam Basin, Qinghai, intersected strata have Neogene playa sedimentary layers.The upper part is clay with strong water sensitivity, and easy to cause hole shrinkage and slurrying; lower part is sandy gravel clasticrocks, easy to cause wall sloughing, collapsing, thus have brought difficulties in drilling operation. In allusion to intersected strata char-acteristics, using a research method of to test salt brine drilling fluid in laboratory first, select adapted drilling fluid formula, then apply-ing the result on the spot. To assess drilling fluid performances, fresh water collapsing prevention, unsaturated salt water, saturated saltwater and salt brine four kinds of drilling fluids to carry out their rejection capability, mud-cake quality and lubrification comparisontests. The result has shown that the performance of salt brine drilling fluid is superior to other kinds of drilling fluid. The preparation ofsalt brine drilling fluid has kept borehole wall stability and higher rock core recovery effectively, and obtained better economical andtechnological results.
In the drilling of halogenic sylvinite in Qaidam Basin, Qinghai, intersected strata have Neogene playa sedimentary layers.The upper part is clay with strong water sensitivity, and easy to cause hole shrinkage and slurrying; lower part is sandy gravel clasticrocks, easy to cause wall sloughing, collapsing, thus have brought difficulties in drilling operation. In allusion to intersected strata char-acteristics, using a research method of to test salt brine drilling fluid in laboratory first, select adapted drilling fluid formula, then apply-ing the result on the spot. To assess drilling fluid performances, fresh water collapsing prevention, unsaturated salt water, saturated saltwater and salt brine four kinds of drilling fluids to carry out their rejection capability, mud-cake quality and lubrification comparisontests. The result has shown that the performance of salt brine drilling fluid is superior to other kinds of drilling fluid. The preparation ofsalt brine drilling fluid has kept borehole wall stability and higher rock core recovery effectively, and obtained better economical andtechnological results.
引文
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[11]王联浩.陕北米108盐井定向钻井工艺技术[J].中国煤炭地质,2013,25(1):62-64.
[12]张蔚,刘亚峰,等.S115井承压堵漏及盐膏层钻井液技术[J].钻井液与完井液,2005,(3):44-46.
[2]张庆海.盐矿钻探技术与工艺[M].北京:地质出版社,1992.
[3]张奎林.滨里海地球厚盐膏层蠕动规律研究[D].山东东营:中国石油大学,2009.
[4]唐继平.盐膏层钻井理论与实践[M].北京:石油工业出版社,2004.
[5]云南地质局第十六地质队.钾盐矿区的钻井液工作[J].探矿工程(岩土钻掘工程).1979,(01):42-43.
[6]刘翠娜,纪卫军,等.盐水钻井液配制方法对其性能的影响[J].探矿工程(岩土钻掘工程),2012,39(1):33-36.
[7]刘政,黄平,等.川渝地区盐膏层钻井液技术对策[J].天然气勘探与开发.2014,(3):75-77.
[8]贾志耀,周兢.青海木里煤田永久冻土地层钻探技术研究[J].中国煤炭地质,2013,25(10):59-62.
[9]赵岩,仲玉芳,等.S/D-2井欠饱和盐水钻井液技术[J].探矿工程(岩土钻掘工程),2011,38(3):41-43.
[10]靳红兵.深部岩盐取心钻探技术[J].探矿工程(岩土钻掘工程),2011,38(10):10-12.
[11]王联浩.陕北米108盐井定向钻井工艺技术[J].中国煤炭地质,2013,25(1):62-64.
[12]张蔚,刘亚峰,等.S115井承压堵漏及盐膏层钻井液技术[J].钻井液与完井液,2005,(3):44-46.