scholarly journals Engineering Innovation of a Length of Nearly 3300m large Diameter Pipeline Installed by HDD

2016 ◽  
Vol 20 (1) ◽  
pp. 1-5
Author(s):  
Li Guohui ◽  
Ma Xiaocheng ◽  
Yang Chunling
Keyword(s):  
Yangtze River ◽  
Large Diameter ◽  
Fine Sand ◽  
Hole Drilling ◽  
Scour Depth ◽  
The Yangtze River ◽  
Directional Drilling ◽  
Horizontal Directional Drilling ◽  
Long Distance ◽  
Pilot Hole

<p>The Yangtze River Crossing Project, which is part of the Chinese gas pipeline trunk network and aims to transmit the natural gas to the Yangtze River Delta area, sets up a record for the length of Horizontal Directional Drilling (HDD) in the world. The term of pipeline installed is 3300m, and the diameter is 40in. Many technical difficulties have been inevitably encountered in a large diameter hole reaming in fine sand, the calculation of section scour depth which determines the minimum buried depth of the pipe, protection of outside coating and the method of long distance pilot hole drilling, such other challenges. In view of this, it was recommended that two pipelines of 711mm should be installed to replace the existing one of 1016mm in diameter and 1% flooding scour depth obtained by reliable statistical analysis. In period of installation, application glass fiber reinforced epoxy resin as a protective coating, executing the pilot hole by Intersect Method. As a result, this super project is finished successfully on May 21.2013. The experience can be applied to any pipeline engineering the installed by horizontal directional drilling or similar works.</p>

Impact of mechanical tripping on cuttings transport in large-diameter horizontal directional drilling applications

2021 ◽  
Vol 117 ◽  
pp. 104159
Author(s):  
Sheng Huang ◽  
Chao Kang ◽  
Alireza Bayat ◽  
Kent Heath ◽  
Cainan Trovato ◽  
...  
Keyword(s):  
Large Diameter ◽  
Directional Drilling ◽  
Horizontal Directional Drilling ◽  
Cuttings Transport

RANS Study on Hydrodynamic Characteristics of Flapped Rudders

2018 ◽  
Author(s):  
Jialun Liu ◽  
Robert Hekkenberg ◽  
Bingqian Zhao
Keyword(s):  
Yangtze River ◽  
Area Ratio ◽  
Hydrodynamic Characteristics ◽  
Hydrodynamic Coefficients ◽  
Sectional Area ◽  
The Yangtze River ◽  
Long Distance ◽  
Ansys Fluent ◽  
Rans Simulations ◽  
Rudder Angle

Ships that equipped with flapped rudders have better manoeuvring performance than ships fitted with traditional spade rudders. Moreover, this advantage is achieved without significantly affecting the ship’s resistance during normal cruising. Flapped rudders are, therefore, favourable for ships that require high manoeuvring performance and sail long distance. Nowadays, there is a trend of using twin flapped rudders on newly built inland vessels in the Yangtze River. To properly design these ships and analyse their manoeuvring performance, the hydrodynamic characteristics of the flapped rudders are required. In this paper, a RANS study is performed to analyse the impacts of the three main properties of a flapped rudder on its hydrodynamic coefficients. The target properties are the rudder profile, the flap-linkage ratio (the flapped angle relative to the rudder chord line divided by the applied rudder angle), and the flap-area ratio (the sectional area of the flap divided by the total sectional area). The RANS simulations are carried out with commercial meshing tool ANSYS Meshing and CFD solver ANSYS Fluent.

scholarly journals The design of bottomhole assembly with two rock cutting tools for directional drilling

2018 ◽  
pp. 14-20
Author(s):  
I. V. Voievidko ◽  
V. V. Tokaruk ◽  
M. A. Bodzian
Keyword(s):  
Theoretical Analysis ◽  
Inclination Angle ◽  
Large Diameter ◽  
Cutting Tools ◽  
Intensity Variation ◽  
Rock Cutting ◽  
Hole Drilling ◽  
Directional Drilling ◽  
Geological Conditions ◽  
Technical Factors

On the basis of the theoretical analysis and practical studies of hole drilling of large diameter, a method for designing the BHA with two rock cutting tools is proposed, taking into account the geological and technical factors that have an impact on the formation of the trajectory. The calculation of BHA with two rock cutting tools and a different number of supporting and centralizing components for different geological conditions of drilling is carried out and the analysis of their work in the process of drilling is conducted. The graphic dependences of the deviation intensity variation and the inclination angle with the sinking of borehole of the large diameter for the BHA that can be used for the drilling of vertical and directional wells.

Horizontal Directional Drilling as a Solution for Crossing of Ridges in the Serrana Province, Mato Grosso, Brazil

2002 ◽  
Author(s):  
Denis Pellerin ◽  
Alaide M. Dura˜o ◽  
Jose´ E. F. P. Jardim ◽  
Carlos Pimenta ◽  
Kazumi Miura
Keyword(s):  
Drilling Fluid ◽  
Steering System ◽  
Gas Pipeline ◽  
Environmental Damage ◽  
Directional Drilling ◽  
Horizontal Directional Drilling ◽  
Environmental Preservation ◽  
Mato Grosso ◽  
Pilot Hole ◽  
Clastic Sedimentary

The crossing of a series of high, parallel, elongated and with steep scarp mountains in the Serrana Province, between Ca´ceres and Cuiaba´, Mato Grosso State, Brazil, constituted a great technical challenge for implementation of the Bolivia - Mato Grosso gas pipeline. Due to environmental preservation, the gas pipeline could not cross the crest of some of these mountains using conventional surface methods and the alternative of surrounding the mountains would have caused an extended additional path, with appreciable additional cost. The economically viable alternative was the horizontal directional drilling through the most critical mountains: Piraputanga Ridge with 850m, Cachoeirinha Ridge with 943m and Palmeiras Ridge with 867m. One of the difficulties was the drilling of the very compact and abrasive Alto Paraguay Group Proterozoic low metamorphic rocks intercalated with clastic sedimentary rocks. The horizontal directional hole intersects in high angles the strongly dipping layers of rocks. The layered sequences of sandstone capped by siltstones provide the aquifer condition to Raizama Fm. with strong water flow. To prevent any environmental damage, the conventional hole design was modified, which allowed the drilling with water, instead of bentonitic drilling fluid. The horizontal directional drilling consisted of a pilot hole with 10.14 inches diameter, drilled with down hole motor and an electromagnetic steering system. The first enlargement of the pilot hole went to 22” diameter and the last one to 30” using special reamer tools. The pipes of the Bolivia - Mato Grosso gas pipeline have 18” diameter, with a special line coating to prevent damages during pulling in contact with rocks. No problems occurred during the pulling operation of the pipes along the holes. The proposed three horizontal directional holes were very successful and the projected designs of the well were fully achieved, with a very small offset in the forecasted exit points. After long weeks of hole opening and preparatory works, all three pulling operations of the pipestrings along the holes went very smoothly.

The Analysis of Stratum Settlement for a Large Diameter Slurry Shield Obliquely Under-Passing Embankment of the Yangtze River

2014 ◽  
Vol 919-921 ◽  
pp. 895-901 ◽  
Author(s):  
Zhou Yun Jiang ◽  
Jie Yu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Yangtze River ◽  
Large Diameter ◽  
Three Dimensional ◽  
The Yangtze River ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Slurry Shield ◽  
Element Method

Displacement caused by tunnel excavation soil may cause the deformation of the buildings or structures nearby and even cause disaster. On the background of a large diameter slurry shield obliquely Under-passing embankment of The Yangtze River. First of all, three dimensional finite element method is used to make a dynamic analysis of the embankment settlement. And the result is compared with the measured values, the accuracy of the finite element method was verified. Then, the stratum settlement of embankment is analyzed under different cross Angle and depth of tunnel. Some useful conclusions are drawn, which can provide some useful reference for similar engineering of tunnel under-passing embankment.

Study of ground collapse induced by large-diameter horizontal directional drilling in a sand layer using numerical modeling

2015 ◽  
Vol 52 (10) ◽  
pp. 1562-1574 ◽  
Author(s):  
Biao Shu ◽  
Baosong Ma
Keyword(s):  
Numerical Modeling ◽  
Oil And Gas ◽  
Large Diameter ◽  
Ground Surface ◽  
Soil Parameters ◽  
Directional Drilling ◽  
Drilling Mud ◽  
Horizontal Directional Drilling ◽  
Ground Collapse ◽  
Mud Pressure

With large-diameter horizontal directional drilling (HDD) becoming the preferred method to construct oil and gas pipelines and utility pipelines beneath rivers, the issue of potential ground collapse arises when drilling in loose geological layers such as sand. Ground collapse is a result of borehole collapse and may cause significant damage to the topography and nearby facilities. The present investigation considered the potential causes of ground collapse induced by an actual 1.219 m diameter HDD river-crossing project, using the FLAC3D numerical modeling tool. The analysis showed that the failure zone first developed at the crown of the borehole, resulting in subsequent borehole collapse due to instability of the sand above, and eventually leading to ground collapse. Sequential reaming cycles have been simulated and the results indicate very little effect in comparison with a single reaming cycle. The risk of borehole collapse, and consequent ground collapse, increases with borehole diameter. Parametric numerical modelling has also been conducted to study the influence of soil parameters and drilling mud pressure on the stability of the ground surface above the borehole. The results show that soil cohesion and friction angle have a large influence on stability of the borehole and ground surface, while elastic modulus and Poisson’s ratio have relatively little effect. It was also determined that mud pressure is a very important factor in maintaining stability of the borehole, and therefore the ground surface as well.

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