页岩气水平井钻井的随钻地质导向方法_刘旭礼

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1、第36卷第5期钻井工程·69·页岩气水平井钻井的随钻地质导向方法刘旭礼中国石油长城钻探工程有限公司刘旭礼.页岩气水平井钻井的随钻地质导向方法.天然气工业，2016,36(5):69-73.摘　要　四川盆地川南地区页岩气开发的主力目标层位为厚约6m的下志留统龙马溪组海相页岩，具有靶窗较小、构造复杂、地层倾角变化大等特点，实钻井眼轨迹存在脱靶和出层的风险。为此，以该盆地威远区块页岩气水平井为例，通过分析该区水平井地质导向过程中出现的技术难点及其原因，从入靶导向和水平段地质导向等关键环节入手寻找出解决上述难点的办法：①应用随钻自然伽马依次测量地层剖面上的高伽马页岩标志层，配合

2、地质录井确定轨迹精确入靶点，保证井眼轨道按设计井斜角姿势入靶，避免了提前入靶和推迟入靶；②应用随钻自然伽马测量优质页岩储层低值层段特征，配合地震深度剖面判断地层大致视倾角以及微构造的发育情况，实现实钻轨迹在钻进箱体中位置的正确确认，确保了储层的钻遇率。2年的现场应用效果表明，该区块已完钻27口水平井，平均深度为5043m，平均水平段长度为1428.96m，优质页岩箱体钻遇率达95.75%。结论认为，优质页岩箱体地质导向方法配合地质、三维地震、气测全烃含量等多种方式，可实现箱体的准确着陆及水平段的精准穿行。关键词　四川盆地　页岩气　水平井　地质导向　钻遇率　测试产量　井眼

3、轨迹　早志留世　龙马溪组DOI:10.3787/j.issn.1000-0976.2016.05.010GeosteeringtechnologyinthedrillingofshalegashorizontalwellsLiuXuli(CNPCGreatWallDrillingCompany,Beijing100101,China)NATUR.GASIND.VOLUME36,ISSUE5,pp.69-73,5/25/2016.(ISSN1000-0976;InChinese)Abstract:InthesouthernSichuanBasin,themajortarg

4、ethorizonofshalegasdevelopmentisthe6m-thickLowerSilurianLongmaxiFmmarineshale.Itischaracterizedbysmallertargetwindow,complexstructuresandgreatlyvariedstratigraphicdips,soitispossiblefortheactualdrillingtrajectorytomissthetargetsandrunoutofthetargetlayers.Inthispaper,theshalegashorizontal

5、wellsinWeiyuanBlockintheSichuanBasinweretakenasexamplesinanalyzingthetechnicaldifficultiesthatoccurredduringthegeosteeringofhorizon-talwellsinthisblockandtherelatedreasons.Then,thesolutionswereworkedoutstartingfromthekeypointsoftargetorientationandhorizontalsectiongeosteering.First,thehi

6、gh-GRshalemarkersonthestratigraphicsectionweremeasuredonebyonebyapplyingGRdetectionwhiledrilling,andcombinedwiththegeologicallogging,theaccuratetargetingpointofholetrajectorywasdetermined,sothatthewelltrackcanrunintothetargetaccuratelyinaccordancewiththedesigneddeviationangle.Second,thec

7、haracteristicsoflow-valueintervalsinqualityshalereservoirswereidentifiedbyapplyingGRdetectionindrilling,andcombinedwiththeseismicdepthprofile,theapproximateapparentstratigraphicdipsandthedevelopmentsituationsofmicro-structureswerediscriminated,sothatthepositionofactualtra