西南石油大学学报(自然科学版)
西南石油大學學報(自然科學版)
서남석유대학학보(자연과학판)
JOURNAL OF SOUTHWEST PETROLEUM UNIVERSITY(SEIENCE & TECHNOLOGY EDITION)
2014年
2期
159-164
,共6页
温杰文%熊继有%梁红军%于静%王国华
溫傑文%熊繼有%樑紅軍%于靜%王國華
온걸문%웅계유%량홍군%우정%왕국화
气体钻井%牙轮钻头%井底流场%数值模拟%喷嘴倾角
氣體鑽井%牙輪鑽頭%井底流場%數值模擬%噴嘴傾角
기체찬정%아륜찬두%정저류장%수치모의%분취경각
gas drilling%cone bit%bottom hole flow field%numerical simulation%nozzle rake angle
基于CFD技术,通过建立井底流场计算模型,运用数值模拟的手段,对气体钻井的三牙轮钻头井底流场进行了数值模拟,并分析了喷嘴侧倾角、前倾角和后倾角对井底流场的影响。结果表明:三喷嘴不同侧倾角设置比相同侧倾角设置更利于井底清岩;三喷嘴复合前倾角比复合后倾角的井底清岩能力更强,但对牙轮切削结构的清洗效果较差;在不改变气体排量的情况下,通过三喷嘴混合复合前倾角和后倾角的方式,可以在保证一个相对较好的井底清岩能力的情况下,提高射流对牙轮切削结构的清洗能力和环空的携岩能力。分析结果为气体钻井系列牙轮钻头的设计、评价以及现场气体钻井的技术措施提供了理论指导。
基于CFD技術,通過建立井底流場計算模型,運用數值模擬的手段,對氣體鑽井的三牙輪鑽頭井底流場進行瞭數值模擬,併分析瞭噴嘴側傾角、前傾角和後傾角對井底流場的影響。結果錶明:三噴嘴不同側傾角設置比相同側傾角設置更利于井底清巖;三噴嘴複閤前傾角比複閤後傾角的井底清巖能力更彊,但對牙輪切削結構的清洗效果較差;在不改變氣體排量的情況下,通過三噴嘴混閤複閤前傾角和後傾角的方式,可以在保證一箇相對較好的井底清巖能力的情況下,提高射流對牙輪切削結構的清洗能力和環空的攜巖能力。分析結果為氣體鑽井繫列牙輪鑽頭的設計、評價以及現場氣體鑽井的技術措施提供瞭理論指導。
기우CFD기술,통과건립정저류장계산모형,운용수치모의적수단,대기체찬정적삼아륜찬두정저류장진행료수치모의,병분석료분취측경각、전경각화후경각대정저류장적영향。결과표명:삼분취불동측경각설치비상동측경각설치경리우정저청암;삼분취복합전경각비복합후경각적정저청암능력경강,단대아륜절삭결구적청세효과교차;재불개변기체배량적정황하,통과삼분취혼합복합전경각화후경각적방식,가이재보증일개상대교호적정저청암능력적정황하,제고사류대아륜절삭결구적청세능력화배공적휴암능력。분석결과위기체찬정계렬아륜찬두적설계、평개이급현장기체찬정적기술조시제공료이론지도。
Based on the CFD technique,the bottom hole flow field CFD model is constructed,the bottom hole flow field of three-cone bit in gas drilling is studied by numerical simulation. We also analyze the impact of nozzle position,side rake angle,front rake angle and back rack angle on bottom hole flow field. The results show that the setting of three nozzles with different side rake angles is more conductive to remove rock from bottom of hole than with same side angle,the bottom hole rock cleaning ability of three nozzles with composite front rake angles is stronger,but cleaning effect on rock cutting structure is poorer,Under the condition of constant gas displacement,mixing three nozzles with composite front rake angle and back rake angle enhances cone cutting structure′s cleaning ability and annulus cutting′s carrying capacity,which guarantees a relatively good bottom hole rock cleaning ability as well. The results of the research provide theoretical guidance for the design and evaluation of cone bit in gas drilling as well as technical measures for gas drilling.