综合录井技术在川西水平井钻井中的导向作用

根据所钻目标层的综合录井参数的表现特征．结合区域地质资料和MWD数据分析，能起到地质导向的作用，并且具有简单易行、成本低廉的优势。在川西地区碎屑岩地层中，砂岩与泥岩、致密砂岩与疏松砂岩可以通过肉眼岩屑鉴定或钻时变化进行识别。准确识别目的层后．根据砂体含气性判别参数变化，通过地质综合分析可以现场初步评价储层，指导水平井钻井在优质储段穿行。在钻遇目的层前的钻井过程中，靶点的随钻预测和确认尤为重要，钻头上、下倾钻进状态的判断主要是确定当前钻进方向与所钻目的层的空间关系，钻头位置分析可以结合目标层地质模型与随钻测斜数据进行分析。以LSIH井为例，介绍了综合录井技术在水平井钻井中的导向作用，结果表明：综合录井技术能及时发现实钻砂体与设计砂体的差异，实现现场靶点的调整，为钻头钻出砂体后重新找到砂体以及减少钻头钻出砂体的几率发挥了重要作用。可应用于非均质性不强、储层发育稳定的水平井施工。

Orientation Role of Comprehensive Logging Technique in Horizontal Well Drilling in Western Sichuan Basin

Comprehensive logging parameters of drilled target stratum,areal geology data and data analysis of MWD play effective geological orientation roles in horizontal well drilling of western Sichuan Basin.It is simple and available and has low cost.In the clastic reservoirs of west Sichuan Basin,sandstone and mudstone,tight sandstone and loose sandstone can be recognized by megascopic cuttings determination and drill time changes.After the recognition of target stratum,parameter change may be clear through sandbody gas bearing probability.Comprehensive geological analysis can evaluate reservoirs preliminarily in the field,which will guide horizontal well drilling at better intervals.In the drilling drilling process before target stratum drilled,forecast while and determination of target spot were more important.If the space relationship between present drilling direction and drilling target stratum is known ,the bit tilt state will be analyzed by geologic model and deviational survey data of the be judged.The position of drilling target stratum.The orientation role bit may of comprehensive logging technique in horizontal well drilling was introduced with the case of LSIH well.The results show that the technique can find the difference between drilled sandbody and designed sandbody,can realize the adjustment of the target spot.It has the important role in finding sandbody again after sandbody drilled and decreasing the probability of sandbody drilled.It can be applied to the horizontal well drilling with weak heterogeneity and stable developed reservoirs.