脉冲式井下增压钻井装置增压特性研究

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1、石油机械2015年第43卷第1期CHINAPETROLEUMMACHINERY．．钻井技术与装备脉冲式井下增压钻井装置增压特性研究付加胜李根生牛继磊。史怀忠田守增(1．中国石油集团钻井工程技术研究院2．中国石油大学(北京)油气资源与探测国家重点实验室3．中国石油大学(华东)石油工程学院)摘要：基于脉冲式井下增压钻井装置的结构和工作原理，建立了其活塞增压模型，进而对其增压特性进行数值模拟研究。研究结果表明，流体增压是活塞运动和高压喷嘴节流共同作用的结果。当其他条件相同时，高压喷嘴出口流速随转速、活塞行程的增大而增大，并且增大幅度较高

2、，增压压力受这3个因素的影响规律相似；高压喷嘴出口流速和增压压力都随高压喷嘴直径的增大而明显降低；随着钻井液密度增大，高压喷嘴出口流速和增压压力稍微增大。高压脉冲射流的脉冲频率只与转速有关，且随转速增大而增大，其他因素对其没有影响。该研究结果为后续的样机设计和现场试验参数的确定提供了依据。关键词：井下增压钻井装置；脉冲式；增压特性；影响因素中图分类号：TE921文献标识码：Adoi：10．3969／j．issn．1001—4578．2015．01．002StudyonSuperchargingCharacteristicofDow

3、nholePulsedPressureIntensifiedDrillingDeviceFuJiasheng·LiGenshengNiuJileiShiHuaizhongTianShouceng(1．CNPCDrillingResearchInstitute；2．StateKeyLaboratoryofPetroleumResourceandProspection，ChinaUniversityofPetrole—um(Beijing)；3．SchoolofPetroleumEngineering，ChinaUniversityo

4、fPetroleum(Huadong))Abstract：Onthebasisofthestructureandworkingprincipleofthedownholepulsedpressurizeintensifieddrillingdevice，thepistonsuperchargingmodelisestablished，basedonwhichthepistonsuperchargingcharacter．isticissimulated．Theresultsshowthatpressurizedfluidisthe

5、resultofpistonmovementandthehigh—pressurenoz—zlechoke．Giventhesameconditions，thehigh．pressurenozzleexitvelocityincreasessignificantlywiththeincre—mentofrevolvingspeedandthepistonstroke．Thehigh—pressurenozzleexitvelocity，revolvespeedandthepistonstrokehavesimilareffects

6、onthesuperchargingpressure．Thehigh-pressurenozzleexitvelocityandthesuperchar。gingpressurereducesignificantlywiththeincrementofthehigh-pressurenozzlediameter．Theincreaseofthefluiddensitywouldresultinslightlyincreasedhigh-pressurenozzleexitvelocityandsuperchargingpressu

7、re．Thepulsefrequencyofthehigh．pressurepulsejetisonlyinfluencedbytherevolvingspeed，andthepulsefrequencywouldincreasewiththeincrementoftherevolvingspeed．Otherfactorshavenoeffectonthepulsefrequency．Thestudyre-suitscouldprovidereferencesforthefollow-upprototypedesignandfi

8、eldtestparametersdetermination．Keywords：downholepressureintensifieddrillingdevice；pulse—type；superchargingcharacteristic；inf