Drill Pipe/Coiled Tubing Buckling Analysis in a Hole of Constant Curvature

1998 ◽  
Author(s):  
Weiyong Qui ◽  
Stefan Miska ◽  
Leonard Volk
Keyword(s):  
Constant Curvature ◽  
Drill Pipe ◽  
Buckling Analysis ◽  
Coiled Tubing

scholarly journals Simple, affordable, and sustainable borehole observatories for complex monitoring objectives

2015 ◽  
Vol 4 (1) ◽  
pp. 99-109 ◽  
Author(s):  
A. Kopf ◽  
T. Freudenthal ◽  
V. Ratmeyer ◽  
M. Bergenthal ◽  
M. Lange ◽  
...  
Keyword(s):  
Pore Pressure ◽  
Data Transfer ◽  
Effective Means ◽  
Drill Pipe ◽  
Cost Effective ◽  
Drill String ◽  
Data Sets ◽  
Coiled Tubing ◽  
Complex Monitoring ◽  
Acoustic Modem

Abstract. Seafloor drill rigs are remotely operated systems that provide a cost-effective means to recover sedimentary records of the upper sub-seafloor deposits. Recent increases in their payload included downhole logging tools or autoclave coring systems. Here we report on another milestone in using seafloor rigs: the development and installation of shallow borehole observatories. Three different systems have been developed for the MARUM-MeBo (Meeresboden-Bohrgerät) seafloor drill, which is operated by MARUM, University of Bremen, Germany. A simple design, the MeBoPLUG, separates the inner borehole from the overlying ocean by using o-ring seals at the conical threads of the drill pipe. The systems are self-contained and include data loggers, batteries, thermistors and a differential pressure sensor. A second design, the so-called MeBoCORK (Circulation Obviation Retrofit Kit), is more sophisticated and also hosts an acoustic modem for data transfer and, if desired, fluid sampling capability using osmotic pumps. In these MeBoCORKs, two systems have to be distinguished: the CORK-A (A stands for autonomous) can be installed by the MeBo alone and monitors pressure and temperature inside and above the borehole (the latter for reference); the CORK-B (B stands for bottom) has a higher payload and can additionally be equipped with geochemical, biological or other physical components. Owing to its larger size, it is installed by a remotely operated underwater vehicle (ROV) and utilises a hot-stab connection in the upper portion of the drill string. Either design relies on a hot-stab connection from beneath in which coiled tubing with a conical drop weight is lowered to couple to the formation. These tubes are fluid-saturated and either serve to transmit pore pressure signals or collect porewater in the osmo-sampler. The third design, the MeBoPUPPI (Pop-Up Pore Pressure Instrument), is similar to the MeBoCORK-A and monitors pore pressure and temperature in a self-contained manner. Instead of transferring data on command using an acoustic modem, the MeBoPUPPI contains a pop-up telemetry with iridium link. After a predefined period, the data unit with satellite link is released, ascends to the sea surface, and remains there for up to 2 weeks while sending the long-term data sets to shore. In summer 2012, two MeBoPLUGs, one MeBoCORK-A and one MeBoCORK-B were installed with MeBo on RV Sonne, Germany, in the Nankai Trough area, Japan. We have successfully downloaded data from the CORKs, attesting that coupling to the formation worked, and pressure records were elevated relative to the seafloor reference. In the near future, we will further deploy the first two MeBoPUPPIs. Recovery of all monitoring systems by a ROV is planned for 2016.

Well Cutting Without Explosives with Multiple Cuts on a Single Run

2021 ◽  
Author(s):  
Hanan Ghannam ◽  
Houssam Mourani ◽  
Brian Joseph Schwanitz
Keyword(s):  
Drill Pipe ◽  
Case Histories ◽  
Critical Part ◽  
Coiled Tubing ◽  
Electric Line ◽  
New Generation ◽  
Deviated Wells

Abstract Pipe cutting operations are often a critical part of stuck pipe situations, well interventions and plug and abandon operations which all need to remove cut sections of pipe from the well. Unlike traditional ‘blade’ style e-line cutters, which can jam under pipe compression or explosive pipe cutters, which need to dress-over the jagged cut by the rig, a new electric line mechanical cutter's unique design enables performance even if the pipe is under compression, in tension or is neutral. It can also perform multiple cuts in the same run, while creating a clean and machined cut with tool-entry friendly shape. This paper will describe the technology of the new generation cutter, present two case histories; one of multiple cuts of stuck drill pipe, per each run in hole, from Germany and one of a critical tubing cut from a subsea well in Nigeria, using electric wireline and tractor conveyed services for many tasks traditionally performed with coiled tubing in highly deviated wells. These "light vs heavy" solutions can often be done off-line from the rig.

On the penetration of tubular drill pipes in horizontal oil wells

2004 ◽  
Vol 218 (9) ◽  
pp. 1063-1081 ◽  
Author(s):  
I McCourt ◽  
T Truslove ◽  
J Kubie
Keyword(s):  
Drill Pipe ◽  
Experimental Studies ◽  
Horizontal Wells ◽  
Oil Wells ◽  
Scale Model ◽  
Coiled Tubing ◽  
Frictional Forces ◽  
Drill Pipes ◽  
Maximum Penetration ◽  
Remedial Work

To carry out remedial work in oil wells through the production tubing string, a method using a continuous length of steel tubing or coiled tubing is used. Furthermore, coiled tubing can also be used for drilling and extending existing wells. In horizontal wells, substantial frictional forces are generated which resist the motion of the tubular drill pipe as it is pushed into the well. As the penetration increases, the frictional forces arising from the contact of the tubing with the inner casing wall increase too, and the tubular pipe buckles. The buckling is initially sinusoidal but eventually transforms into helical. At this point the force required to push the tubular drill pipe rises dramatically, and the maximum penetration is then rapidly reached. To date, scale model experimental studies on horizontal wells have not reproduced the actual conditions occurring in the wells. A new experimental rig has been designed that allows for the simulation and observation of all significant parameters. An analytical model has also been developed which is in excellent agreement with the experimental data. Governing modelling parameters have been identified which suggest ways to increase the penetration of tubular drill pipes in production oil wells.

A New Approach to Coiled Tubing Improved Inspection

2011 ◽  
Vol 105-107 ◽  
pp. 1957-1960
Author(s):  
Zhao Ming Zhou ◽  
Fu Wan ◽  
De Sin Mao ◽  
Quan Chuan Xu ◽  
Chen Xing Wei
Keyword(s):  
Wall Thickness ◽  
Drill Pipe ◽  
Measuring Method ◽  
Line Pipe ◽  
New Approach ◽  
Coiled Tubing ◽  
Micro Cracks ◽  
Testing Technology ◽  
Flux Gate ◽  
Thickness Measurements

Many of the NDT methods used for casing, tubing, drill pipe and line pipe are applicable, with some minor modifications, to CT. This article describes the requirements of an ideal in-service inspection. This paper presents a new wall thickness and ovality measuring method engineered for reliable field use. This method based on flux gate testing technology discussed in this paper .This method not only will detect internal flaws and the density of micro-cracks, but also wall thickness measurements will be made. This paper discusses the development of this new method, the detection of eddy current testing program is used in coiled tubing ovality measurements. The key technology is the production of amorphous alloy core. Using this method measure diameter, wall thickness and ovality of CT, is currently being developed.

Coiled-Tubing-Conveyed Tubing and Drill-Pipe Cutting

2003 ◽  
pp. 180-184
Author(s):  
Joe DeGeare ◽  
David Haughton ◽  
Mark McGurk
Keyword(s):  
Drill Pipe ◽  
Coiled Tubing
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