New Methodology of Slot Recovery Minimizing Milling Operation

2021 ◽  
Author(s):  
Ryosuke Sato ◽  
Islam Khaled Abdelkarim ◽  
Abdul Rahman Hasan Albeshr ◽  
Takahiro Toki ◽  
Salim Abdalla Al Ali ◽  
...  
Keyword(s):  
New Technologies ◽  
Applied Pressure ◽  
Drill String ◽  
Rotary Table ◽  
Actual Case ◽  
Milling Operation ◽  
Drill Pipes ◽  
Pulling Force ◽  
Complete Operation ◽  
Typical Method

Abstract Slot recovery operation can be considered as one of the most time consuming operation. Cut and pull casings, or milling casings have been carried out as typical method of slot recovery. However there are a lot of risks with this typical method such as poor progress of milling, damaging top drive due to high vibration while milling or sudden string jumping up while overpulling and possibility of string stuck caused by poor hole cleaning while milling. We have completed slot recovery operations on numbers of wells, but there were a lot of troubles caused by above mentioned adversaries on rig equipment and taking a lot of time to complete operation. There are several kinds of new slot recovery technologies that may save rig time and less harmful than conventional method. Casing Pulling Tool (CPT) is one of the new technologies which eliminates or mitigates risks mentioned above. CPT has piston internally and it is activated by applying pressure inside string. CPT is run with casing spear and drill pipes. Once spear is engaged with casing and apply pressure inside drill string, CPT provides pulling force on casing. Pulling force is varied depend on the applied pressure and maximum available pulling force is more than 1,000 kips. Hence upper part of string is anchored at rotary table by slips, pulling force is applied on casing and drill string below rotary table. This means no pulling force is applied on top drive and minimize the chance of getting damage on it. As an actual case, we could successfully recover 13-3/8" casing by CPT without having any troubles and complete slot recovery operation with saving rig time compared to the conventional methods. This paper introduces the details about the case mentioned above.

Fatigue Assessment of Drill Pipes

2017 ◽  
Author(s):  
P. J. Haagensen ◽  
T. I. Grøttum
Keyword(s):  
Failure Modes ◽  
Fatigue Behavior ◽  
Drill String ◽  
American Petroleum Institute ◽  
Directional Drilling ◽  
Fatigue Wear ◽  
Threaded Connections ◽  
Current Design ◽  
Drilling Operations ◽  
Drill Pipes

Fatigue failures during offshore drilling operations is still a very costly problem. The fatigue behavior of drill pipes is reviewed, and typical failure modes are identified. The effects of drill string curvature during directional drilling on pipe body stress and on the fatigue life is examined. Effects on applied mean stress from drill string weight are discussed. Interaction effects of degradation mechanisms such as fatigue, wear and corrosion are evaluated. Experimental background data and statistical evaluation that form the basis for the current design practice issued by American Petroleum Institute (API) and other guidance in codes and standards is reviewed. Results from several recent testing programs performed under rotating bending of pipes with threaded connections, and tests involving the pipe body under resonance conditions are presented. The tests were made with pipe sizes from 2 7/8 in. to 5 7/8 in. in Grade S-135 pipes. The results are compared with published test data and design guidance such as API Recommended Practice G7 [1]. Recommendations are given for research and testing to improve reliability and the safe operation of drill strings.

Vibration Analysis of Flexible Multi-Body Drill String System by FSI

2012 ◽  
Vol 184-185 ◽  
pp. 631-640
Author(s):  
Gui Jie Yu ◽  
Lei Fu ◽  
Wen Sheng Xiao ◽  
You Cai Yin
Keyword(s):  
Elastic Vibration ◽  
Drill String ◽  
Lateral Vibration ◽  
Drilling String ◽  
Structure Vibration ◽  
Drilling System ◽  
Drill Pipes ◽  
Multi Body ◽  
The Relationship ◽  
Vertical Borehole

Combined with features of flexible multi-body drilling string system and top-drive drilling system, the characteristic equation for lateral, twisting and longitudinal coupled vibration of flexible multi-body drilling string system is developed based on elastic vibration theory and finite element method, and the lateral vibration constraints is restored. Within 1700m vertical borehole, the relationship between the intrinsic frequency of flexible multi-body drilling string system and axial load, static drilling pressure, mud, length of drill collars, length of drill pipes are gained by analyzing the lateral vibration, twisting vibration and longitudinal fluid-structure vibration of flexible multi-body drilling string system by using software ANSYS. One to five step intrinsic frequencies of flexible multi-body drilling string system are gained. The research is about the theoretical basis for Well bore control theory of top drive drilling.

scholarly journals Influence of Chemical Corrosive Environment with H2S on Drill Strings, Experimental Researches

2020 ◽  
Vol 71 (4) ◽  
pp. 29-37
Author(s):  
Mihaela Madalina Caltaru ◽  
Marius Badicioiu ◽  
Alin Dinita ◽  
Dragos Gabriel Zisopol ◽  
Razvan George Ripeanu ◽  
...  
Keyword(s):  
Brittle Fracture ◽  
Fatigue Cracks ◽  
Drill String ◽  
Oil Field ◽  
Corrosive Environment ◽  
Inner Surface ◽  
Drill Pipes ◽  
Corrosive Environments ◽  
Experimental Researches ◽  
Diffusion Of Hydrogen

The present researches established the failure causes of the drill string, used in corrosive environments with H2S, in an oil field, by initiating fatigue cracks from the corrosion points on the inner surface of the drill pipes, which favoured the diffusion of hydrogen, the brittleness of the material and the brittle fracture.

scholarly journals The Stress-Strain State of the Drill String at the Section of the Borehole with a Cavern

2016 ◽  
Vol 5 (2) ◽  
pp. 122
Author(s):  
Ruslan Rachkevych ◽  
Iryna Rachkevych
Keyword(s):  
Cross Section ◽  
Relative Position ◽  
Strain State ◽  
Drill String ◽  
Transverse Load ◽  
Bending Stress ◽  
Stress Strain ◽  
Stress Strain State ◽  
Drill Pipes ◽  
The Cross

<p class="1Body">This study analyses the stress-strain state of a drill string at the section of the borehole with a cavern/chute. The study was conducted to obtain analytical dependencies to determine normal bending stress in the cross section of the drill string and its downforces to the walls of the well. This will allow to compare these values with the critical ones, and draw conclusions about the possibility and duration of the drill string operation under these conditions.</p><p class="1Body">The study is based on modelling the drill string as a beam, which indicates longitudinal and transverse load and deforms in-plane.</p><p class="1Body">The formulas obtained to determine stresses and pressing forces apply to the following cases of the relative position of the drill string in a straight borehole and a curved borehole with a cavern/chute: a – the drill string touches only the bottom of the borehole; b – the drill string touches only the bottom of the borehole and the bottom of the cavern/chute; c –  the drill string touches the top and the bottom of the borehole; d – the drill string touches the top and the bottom of the borehole and the cavern/chute.</p><p class="1Body">The calculations based on the dependencies obtained lead to the following conclusions: a – the cavern/chute in the inclined straight borehole causes bending stress value in the cross section of drill pipes proportional to the fatigue margin of the material; b – the cavern/chute in the curved borehole may increase normal bending stress in the cross section of the borehole up to five times.</p>

Trajectory Tracking Control for Rotary Drilling Systems Via Integral Sliding Mode Control Approach

2020 ◽  
Vol 1 (3) ◽  
Author(s):  
Chien-Chih Weng ◽  
Mansour Karkoub ◽  
Wen-Shyong Yu ◽  
Ming-Guo Her ◽  
Hsuan-Yi Chen
Keyword(s):  
Sliding Mode Control ◽  
Trajectory Tracking ◽  
Sliding Mode ◽  
Drill String ◽  
Rotary Table ◽  
Rotary Drilling ◽  
Integral Sliding Mode Control ◽  
Integral Sliding Mode ◽  
Mode Control ◽  
Drilling System

Abstract Active and passive control techniques have been devised over the years to mitigate the effect of vibrations on drill-string life with varying degrees of success. Here, it is proposed to design a robust trajectory tracking controller, which ultimately forces the rotary table and the drill-bit to move with the same speed (speed synchronization), hence reducing/eliminating torsional vibrations from the drill pipes. A model of the rotary drilling system, which includes torsional stick-slip, is first developed; then, an integral sliding mode control with time-varying exponent (ISMC-TVE) scheme is developed such that the bit motion tracks that of the rotary table to mitigate the effects of the induced vibrations. The ISMC-TVE is able to control the transient stage of the drill-string system’s response, maintain the system in the sliding state even under abrupt or existing external disturbances, and guarantee asymptotic stability of the rotary drilling system. The Lyapunov stability theorem is used here to analyze the performance of the closed-loop system, and the simulation results showed that the ISMC-TVE law is capable of accurately synchronizing the bit and rotary table speeds.

Friction Considerations in Rotary Shouldered Threaded Connections

2007 ◽  
Author(s):  
Catalin Teodoriu ◽  
Herschel McDonald ◽  
Charles Bollfrass
Keyword(s):  
Drill Pipe ◽  
Extreme Environments ◽  
Drill String ◽  
Directional Drilling ◽  
Frictional Properties ◽  
Threaded Connections ◽  
Safety Margins ◽  
Drill Pipes ◽  
Drilling Conditions ◽  
First Time

The new connection designs introduced by the drill pipe manufacturers (double shoulder connections, intelligent drill pipes or any new design for increased torque resistance) make the use of the Farr formula for calculating proper assembly torque more problematic. Additionally, severe drilling conditions like HPHT, directional drilling and extreme environments are affecting critical thread compound performance properties, which can make it impossible to attain the optimum makeup torque for the connection. The new drilling conditions are exposing the drill string components to higher loads and consequently reduce the safety margins. Since the makeup process is the only way to control and achieve the maximum tool joint loading capacity, it becomes important to understand the effect of friction on optimum makeup torque calculation. This paper presents a modified equation for optimum makeup torque calculation by using the latest research on thread compound frictional properties. Also, the thread compound lubrication mechanism will be explained. For the first time the thread turn load will be related to the optimum makeup torque. The paper will also explain why there is a need for a new API standard for determining thread compound frictional properties. The formula developed herein, based on experimental results, demonstrates that the newly introduced overall factor may differentiate between used and new connections.

scholarly journals Analytical investigations of the accuracy of the small diameter tool-joint tapered thread made by a lathe machining

2019 ◽  
Vol 2 (1) ◽  
pp. 268-276
Author(s):  
Oleh Onysko ◽  
Volodymyr Kopei ◽  
Iulia Medvid ◽  
Vitalii Panchuk ◽  
Lolita Pituley ◽  
...  
Keyword(s):  
Small Diameter ◽  
Rake Angle ◽  
Drill String ◽  
Influential Factor ◽  
Tangential Displacement ◽  
Profile Angle ◽  
Operational Characteristics ◽  
Thread Profile ◽  
Drill Pipes ◽  
Tool Joint

Abstract The drill string consists of connected drill pipes and other elements. The connection is carried out by screwing of the drill string elements with the help of tool-joint tapered thread. The operational characteristics of the drill pipes depend of the manufacture precision of these tool-joints mostly. The accuracy of the thread is regulated by the accuracy of its profile and the accuracy of its pitch diameter value. The accuracy of the tapered thread manufacturing on the lathe in its depending on the values of the geometric parameters of the lathe tool and the values of deviations of its installation relatively to the workpiece axis is investigated. It is proved that for the tapered thread of form VI profile used for connection of drill pipes with the diameter from 30 mm to 44 mm the most influential factor, in relation to the accuracy of the thread profile is the value of the rake angle. Application of the rake angle value up to −5° according to the research data leads to a deviation from the specified profile of 0.3°, which is more than 35% of the declared standard tolerance on deviations from the profile. Also, the influence of the back rake angle value on the value of the deviation from the standard pitch diameter of the thread is proved. It is proved that the magnitude of the tangential displacement of the nose of the cutter relatively to the axis of the thread up to −0.2 mm can cause a deviation of the profile angle of 0.18°, which is 27% of the standard tolerance.

A Challenging Drilling Campaign Unleashed a Unique Fast Drill String Recovery Methodology Eliminating Utilizing Wireline, CT and Overcome Highly Deviated String Accessibility

2021 ◽  
Author(s):  
Khaled Abdelhalim ◽  
Mohamed Al Zaabi ◽  
Salim Al Ali ◽  
Islam khaled Abdel Karim ◽  
Haitham Jadallah ◽  
...  
Keyword(s):  
Drill String ◽  
Fast Recovery ◽  
Significant Cost ◽  
Engineering Team ◽  
Downhole Tool ◽  
Environmentally Safe ◽  
Zonal Isolation ◽  
Drill Pipes ◽  
Side Track ◽  
Operating Company

Abstract Stuck pipe is one of the biggest challenges in the drilling sector and is a multi-billion-dollar issue. Recovering from stuck pipe absorbs significant cost and time. Durations for stuck pipe events and recovery can be mostly variable from a few days to up to over a month to resolve. When attempts to release the stuck pipe by jarring or acid fail, the operating company and drilling contractors are left with little option but to sever the drill string and prepare for side-track operations or even abandon the hole. Traditional pipe severance methods in the event of a stuck pipe situation typically take significant time (often days, and sometimes weeks), require specialist tools, Service Hands, and are usually reliant on wireline services to deliver the severance method. In 2018, a Major Operating Company in UAE faced a challenging high-sticking Formation, which caused massive NPT, stuck of drill strings, and loss of drilled section holes. Brainstorming within the Drilling Engineering team took the campaign to the next level of pre-planning to reach deep access in the hole to be able to achieve zonal isolation by spotting cement plugs through drilling BHA, find a solution to save the hole and recover the pipes in an efficient, cheap and productive manner. An environmentally safe pre-planned solution to severe the drill string was proposed to help save the wells and allow an excellent methodology to save the wells/fields from stuck pipe risks. The engineering solution allows a fast recovery of drill pipes using a downhole tool as a part of drilling BHA, with the option to activate it if required, by dropping a smart dart and circulating with mud for a specific time to apply cut string with two option, either spotting cement with recovered BHA or lift BHA with fish neck to try to fish in the hole.

Automated Well Control: From Automated Detection to Automated Shut-In

2021 ◽  
Author(s):  
Bryan Wade Atchison
Keyword(s):  
Oil And Gas ◽  
New Technologies ◽  
Oil And Gas Industry ◽  
Drill String ◽  
Step Change ◽  
Innovative Technology ◽  
Environmental Damage ◽  
Gas Industry ◽  
Well Control ◽  
Drilling Rig

Abstract Objectives April 2010 in the Gulf of Mexico and January 2017 in Oklahoma brought into sharp focus what can happen if the oil and gas industry gets well control wrong: 16 fatalities, significant environmental damage, loss of assets and reputation. Each year we have multiple blowouts and several fatality events due to a loss of well control. The oil and gas industry can improve from a personnel safety, environmental and reputation perspective. The Automation of Well Control will bring a significant step change in the area of Process Safety forwells. It prevents blowouts, reduces all influx volumes, minimising kicktolerance volumes and reducingcasing and well costs. Method A system has been developedwhich enables Automated Well Control whilst in drilling mode. Pre-determined influx rates, agreed by the operator and drilling contractor, and input by the driller are established. Once the system detects the influx, it performs a series of operations by taking control of the drilling rig equipment. The drill string is spaced out, top drive and mud pumps are stopped, and the BOP is closed. All of this occurs without the driller doing anything; however, he can intervene at any moment. Thissystem is designed as an aid to the driller and does not remove his responsibility. Results The Automated Well Control system has been tested on drilling simulators with real drillers. Comparisons tests have shown that the technology enables shut-in times faster than conventional human interface methods, with influx volumes typically 10-20% of those experienced during manual shut-in. Additionally, a full Field Trial using a traditional rigdemonstrated the effectiveness of the system, proving up the functionality under different operational requirements. The system can now be applied to any type of rig worldwide. Over 50 potential modules have been identified. Planned developments forthe system include circulatingout the kick automatically, shut-in for tripping, circulating, cementing and in-flow testing. It provides assurance for afast, safe and effective shut-in.A full Technology Qualification process has been used for this technology. Innovative Technology Over the past 20 years, technology advancements associated with simulators and cyber-rigs have enabled new technologies to be developed. One of these technologies is Automated Well Control. It is believed that this innovative system will enable a step change in the performance ofprocess safety forwell control, dramaticallyreducing major accident hazards, thereby saving millions of dollars per well, reducing environmental impact and preventing loss of life.

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