射流泵系统在非开挖HDD中的应用研究
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摘要
非开挖HDD技术被广泛应用于给排水、电力、通信、油气等领域的新管道敷设和既有管线修复中。当在浅部地层以及上覆地层应力较小的区域进行HDD施工时,易出现"溢浆"现象。本文结合国内外"溢浆"防控技术研究现状,对德国某公司的孔内新型射流泵系统在非开挖工程中的应用进行了论述。该系统利用在近钻头位置安装的高压射流泵系统收集前端钻头扩孔后形成的钻屑,从而减少钻孔环状空间的钻屑含量。系统主要由钻屑收集装置、射流泵体和连接装置3部分组成,可实现98%左右孔内钻屑的清理。根据工程需要,可采用清孔、软土扩(清)孔、组合以及管道回拉等4种模式进行工程作业。工程实践表明,采用该系统后单日最长掘进长度达到122m。同时提出了存在的问题:由于小直径复杂地层钻进中易出现钻屑团积,从而对筛格产生堵塞。在管道回拉模式中,如何改变钻屑返排的回路等问题仍是该系统在应用中亟待解决的关键问题。
As one method of Trenchless,HDD technology is widely used in new pipeline laying and existing pipeline repair in the fields of water supply and drainage,electric power,communications,oil and gas.The phenomenon of"overflow"is easy to occur when the HDD construction is carried out in the shallow stratum and the area where the stress of the overburden is small.This paper which combines the research status of "overflow" prevention and control technology domestic and foreign areas discusses the application of a new in-hole jet pump system design by a German company in trenchless engineering.The system sets a high-pressure jet pump system installed near the drill bit to collect cuttings formed during reaming process,thereby reducing the number of cuttings in the borehole space.The system is mainly composed of drill cuttings collection device,jet pump and connecting device,which can clean up about 98% of cuttings in the borehole.According to the needs of the project,four modes,such as borehole clearing,soft ground reaming &cleaning,combination and pipe pullback,can be used for pipeline laying.Field practice indicates that the longest drilling length can reach 122 mper day associated with the system.At the same time,the existing problem is present in this paper.The screen will be blocked due to the formation of cuttings aggregation in complex formations with small diameter drilling.For the pipe pullback mode,how to change the return loop of cuttings is still the key problem to be solved in the jobsite.
As one method of Trenchless,HDD technology is widely used in new pipeline laying and existing pipeline repair in the fields of water supply and drainage,electric power,communications,oil and gas.The phenomenon of"overflow"is easy to occur when the HDD construction is carried out in the shallow stratum and the area where the stress of the overburden is small.This paper which combines the research status of "overflow" prevention and control technology domestic and foreign areas discusses the application of a new in-hole jet pump system design by a German company in trenchless engineering.The system sets a high-pressure jet pump system installed near the drill bit to collect cuttings formed during reaming process,thereby reducing the number of cuttings in the borehole space.The system is mainly composed of drill cuttings collection device,jet pump and connecting device,which can clean up about 98% of cuttings in the borehole.According to the needs of the project,four modes,such as borehole clearing,soft ground reaming &cleaning,combination and pipe pullback,can be used for pipeline laying.Field practice indicates that the longest drilling length can reach 122 mper day associated with the system.At the same time,the existing problem is present in this paper.The screen will be blocked due to the formation of cuttings aggregation in complex formations with small diameter drilling.For the pipe pullback mode,how to change the return loop of cuttings is still the key problem to be solved in the jobsite.
引文
[1]刘远亮,乌效鸣,吕泽彬.大型穿越钻进工程防冒浆钻井液技术[J].煤田地质与勘探,2009,37(2):79-80.
[2]朱金勇,董洪栋,陈礼仪.淤泥质粘土层非开挖定向钻进高分子植物胶冲洗液研究[J].科学技术与工程,2016,30(16):187-190.
[3]郎明春,叶文建,张杰,等.适用于中粗砂岩地层水平定向钻进的泥浆方案设计[J].地质科技情报,2016,35(2):20-22.
[4] Sadeghalvaad M,Sabbaghi S.The effect of the TiO2/polyacrylamide nanocomposite on water-based drilling fluid properties[J].Powder Technology,2015,272:113-119.
[5] Srivatsa J T,Ziaja M B.An experimental investigation on use of nanoparticles as fluid loss additives in a surfactant-polymer based drilling fluids[C]//International Petroleum Technology Conference,2011:15-17.
[6] Sun P,Tian M,Cao H,et al.Study on the mechanism of ENI action on preventing drilling fluid overflowing in HDD[J].Tunnelling and Underground Space Technology,2018,77:94-102.
[7] Ariaratnam S T,Lueke J S,Anderson E.Reducing risks in unfavorable ground conditions during horizontal directional drilling[J].Practice Periodical on Structural Design and Construction,2004,9(3):164-169.
[8] Geehan T,Forbes D M,Moore D J.Control of Chemical Usage in Drilling Fluid Formulations to Minimize Discharge to the Environment[C]//SPE Health,Safety and Environment in Oil and Gas Exploration and Production Conference.Society of Petroleum Engineers,1991,SPE23374:475-481.
[9] Aase B,Omland T H,Jensen E K,et al.Criticality Testing of Drilling-Fluid Solids-Control Equipment[J].SPE Drilling&Completion,2013,28(2):148-157.
[10] Society of Petroleum Engineers.New jet pump technology for long-distance pipe jacking and HDD crossings in highly permeable soil[C]//North American Society for Trenchless Technology,2018,TM2-T4-02:1-19.
[2]朱金勇,董洪栋,陈礼仪.淤泥质粘土层非开挖定向钻进高分子植物胶冲洗液研究[J].科学技术与工程,2016,30(16):187-190.
[3]郎明春,叶文建,张杰,等.适用于中粗砂岩地层水平定向钻进的泥浆方案设计[J].地质科技情报,2016,35(2):20-22.
[4] Sadeghalvaad M,Sabbaghi S.The effect of the TiO2/polyacrylamide nanocomposite on water-based drilling fluid properties[J].Powder Technology,2015,272:113-119.
[5] Srivatsa J T,Ziaja M B.An experimental investigation on use of nanoparticles as fluid loss additives in a surfactant-polymer based drilling fluids[C]//International Petroleum Technology Conference,2011:15-17.
[6] Sun P,Tian M,Cao H,et al.Study on the mechanism of ENI action on preventing drilling fluid overflowing in HDD[J].Tunnelling and Underground Space Technology,2018,77:94-102.
[7] Ariaratnam S T,Lueke J S,Anderson E.Reducing risks in unfavorable ground conditions during horizontal directional drilling[J].Practice Periodical on Structural Design and Construction,2004,9(3):164-169.
[8] Geehan T,Forbes D M,Moore D J.Control of Chemical Usage in Drilling Fluid Formulations to Minimize Discharge to the Environment[C]//SPE Health,Safety and Environment in Oil and Gas Exploration and Production Conference.Society of Petroleum Engineers,1991,SPE23374:475-481.
[9] Aase B,Omland T H,Jensen E K,et al.Criticality Testing of Drilling-Fluid Solids-Control Equipment[J].SPE Drilling&Completion,2013,28(2):148-157.
[10] Society of Petroleum Engineers.New jet pump technology for long-distance pipe jacking and HDD crossings in highly permeable soil[C]//North American Society for Trenchless Technology,2018,TM2-T4-02:1-19.