4/5/2025, 9:04:30 PM 星期六
柴达木盆地石圈滩地区铀矿钻探冲洗液研究与应用
CSTR:
作者:
作者单位:

核工业二〇三研究所,陕西 西安 712000

中图分类号:

P634.6

基金项目:

中国核工业地质局项目“地浸砂岩型铀矿高效取心工艺研究”(编号:202110-5)


Research and application of flushing fluid for uranium deposits drilling in Shiquantan area, Qaidam Basin
Author:
Affiliation:

No.203 Research Institute of Nuclear Industry, Xi’an Shaanxi 712000, China

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    摘要:

    柴达木盆地石圈滩地区铀矿资源调查评价钻探中钻遇地层高压异常,0~600 m地层压力系数为1.25~1.4;地层易溶,含盐量最高达1.025%,钻孔资料较少,在钻探过程中经常出现卡钻、塌孔等严重孔内事故。通过对该区地层进行岩性特征分析,根据地层特点进行冲洗液造浆粘土与处理剂优选,提出了一套适用于该区地层的抗盐防塌冲洗液体系,该体系具有良好的抗盐防塌性能,主要表现为:表观粘度38 mPa·s、动切力16.4 Pa、API滤失量4~5 mL、泥皮厚度0.3~0.4 mm,薄且致密,护壁效果良好。有效解决了该地区施工盐膏层缩径、塌孔及高压异常条件下冲洗液失稳等难题,平均台月效率从729.76 m提升至1378.78 m,孔径扩大率从130%下降至19.4%,泥浆材料和用水成本从57.91元/m降至38.92元/m,在现场实际应用中取得了良好的经济效益,具有推广应用价值。

    Abstract:

    During the investigation and evaluation of Uranium deposits in Shiquantan area of Qaidam Basin,the formation pressure anomaly was encountered. The formation pressure coefficient of 0~600m is 1.25~1.4. The formation is easily soluble with a high salt content of up to 1.025%. Accidents such as stuck and collapse usually happened during the drlling process as drilling information about this area is less. In this paper, a set of anti-salt and anti-collapse flushing fluid system suitable for the strata in this area is proposed by analyzing the lithological characteristics of the strata in this area, and preferentially selecting the corresponding slurry-making clay and treatment agent for the flushing fluid. As a result, this systerm has good anti-salt and anti-collapse performance, mainly showing as follows: the apparent viscosity 38MPa·s, the dynamic shear force is 16.4Pa, the API filter vector is 4~5mL, the mud skin is thin and dense with the thickness of 0.3~0.4mm which has good wall protection effect. It effectively solved the problems such as shrinkage in salt-gypsum layers, hole collapse and destabilization of flushing fluid under abnormal conditions of high pressure in this area. As a result, the average monthly efficiency is increased from 729.76m to 1378.78m, the hole expansion rate is reduced from 130% to 19.4%, and the cost of mud material and water is reduced from 57.91RMB/m to 38.92RMB/m. Good economic benefits have been achieved in practical application in the field which make it has the value of popularization and application.

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    引证文献
引用本文

龚美鑫,汪成勇,陈擎,等.柴达木盆地石圈滩地区铀矿钻探冲洗液研究与应用[J].钻探工程,2023,50(4):57-63.
GONG Meixin, WANG Chengyong, CHEN Qing, et al. Research and application of flushing fluid for uranium deposits drilling in Shiquantan area, Qaidam Basin[J]. Drilling Engineering, 2023,50(4):57-63.

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  • 收稿日期:2022-11-12
  • 最后修改日期:2023-03-25
  • 录用日期:2023-03-31
  • 在线发布日期: 2023-07-20
  • 出版日期: 2023-07-10
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