scholarly journals Applying modern technologies when drilling directional wells with long horizontal boreholes

2020 ◽  
pp. 13-18
Author(s):  
Kuriachii Aleksandr ◽  
◽  
Kaliagin Sergei ◽  
Keyword(s):  
Horizontal Wells ◽  
Economic Advantage ◽  
Directional Drilling ◽  
Skew Angle ◽  
Service Companies ◽  
Bottom Hole ◽  
Geological Conditions ◽  
Bottom Hole Assembly ◽  
The Given ◽  
Modern Technologies

Introduction. Directional drilling of wells is currently carried out by a rotary steerable system and conventional equipment including a mud motor with an adjustable skew angle. Either of the two methods has particular advantages. Research aim is to analyze the technologies provided by various service companies in the field of directional and horizontal wells drilling in order to provide means of improving the utilization capacity of the conventional bottom hole assembly in long horizontal boreholes. Methodology. When drilling directional wells with a small departure from the vertical and wells with horizontal boreholes up to 500 m long, a preference is given to a mud motor as far as a change in deviation parameters is concerned. This is due to the fact that the mud motor has a significant economic advantage. However, when drilling directional well with complex planned profile or a well with a horizontal borehole of more than 500 m, the mud motor may cause a variety of problems, while a rotary steerable system will allow to avoid some of them. Results. The rotary steerable system is not always economically feasible suggesting a need for an alternative technology with a more advantageous offer on the market of services. A system of pulsed controlled drilling will allow the adjustment of the trajectory of the wellbore when drilling in a rotary mode with conventional equipment for directional drilling, reduce rig time, and improve the borehole quality. Summary. The given technology will make it possible to improve the efficiency of conventional equipment which includes the mud motor for directional wells drilling with complex planned profile and long horizontal boreholes of more than 500 m, as soon as the technology provides the possibility of adjusting the trajectory in a rotary mode. The system of pulsed controlled drilling is developed as an alternative to the rotary steerable system making it possible to significantly reduce construction expenses for wells with complex geological conditions of drilling

scholarly journals Studying of speed on the process drill string flattening vertical wells

2019 ◽  
pp. 30-38
Author(s):  
Rasul M. Aliyev ◽  
Shamil M. Kurbanov ◽  
Temirlan M. Umariev
Keyword(s):  
Drill String ◽  
Oil Field ◽  
Vertical Wells ◽  
Service Companies ◽  
Field Service ◽  
Bottom Hole ◽  
Geological Conditions ◽  
Bottom Hole Assembly ◽  
The Cost ◽  
Drill Collar

The issue of vertical wells curvature is important, especially when conducting wells in complex geological conditions of drilling, due to the increasing depth of the wells and the corresponding rise in the cost of drilling. The cause of this circumstance lies in the large time and financial costs while flattening of the bent wells. Moreover, it should be noted that during the subsequent drilling of a curved well the risk of key-seating and the corresponding complications increases. That is why large oil field service companies and drilling enterprises are paying more and more attention to solving the problem of vertical wells curvature. This article is devoted to investigation the effect of rotation of the drill string on the deflecting force on the bit while drilling a vertical well in a rotary way. We suggest using of eccentric drill collars for drilling vertical wells in difficult geological conditions. Also, we create an expression for the dynamic milling force on the bit, taking into account the usage of an eccentric drill collar in the composition of bottom-hole assembly.

Application Of Tandem Rotary Steerable-Positive Displacement Motor Bottom Hole Assembly In Drilling Horizontal Wells: Case Study Of Three East Siberia Wells

2011 ◽  
Author(s):  
Zimuzor Michael Okafor ◽  
Andrew John Buchan ◽  
Dmitry Diyanov ◽  
Sheldon Andre Rawlins ◽  
Grigoriy Zhadan ◽  
...  
Keyword(s):  
Horizontal Wells ◽  
East Siberia ◽  
Positive Displacement ◽  
Bottom Hole ◽  
Bottom Hole Assembly

The development of the modeling of the BHA for directional drilling

2020 ◽  
pp. 15-23
Author(s):  
I.D. Mukhametgaliev ◽  
◽  
А.K. Agliullin ◽  
R.A. Ismakov ◽  
M.E. Loginova ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Directional Drilling ◽  
Gas Wells ◽  
Natural Form ◽  
Lower Point ◽  
Bottom Hole ◽  
Simulation Based ◽  
Oil And Gas Wells ◽  
Bottom Hole Assembly ◽  
Typical Calculation

The article discusses the development of technology for directional drilling of oil and gas wells in the perspective of modeling downhole operations. The most significant mathematical models developed by Soviet and foreign scientists in the XX century are listed. An example of calculating the reaction on a bit based on the most widely used method of initial parameters is shown. In the process of a typical calculation of the deflecting force on the bit, it was possible to set the boundary conditions on the bottom hole assembly (BHA) supports in a natural form, using a well-known approach for calculating the deflection of the beam. The obtained results of calculations were applied in the construction of a simulation model for computer simulation based on a virtual program-simulator of the drilling directional wells. The simulating software allowed us to evaluate the effect of the Zenith angle of the well and the rigidity of the oriented layout on the deflecting force on the bit, the deflection of the turbo drill along the length from the bit to the nearest lower point of contact of the well wall.

scholarly journals Drillstring Design untuk Directional Drilling pada Sumur X Lapangan Y

2020 ◽  
Vol 10 (1) ◽  
pp. 15-24
Author(s):  
Khalid Akbar Suryakusuma ◽  
Keyword(s):  
Directional Drilling ◽  
Bottom Hole ◽  
Bottom Hole Assembly

Pada metode-metode awal, saat media informasi dan teknologi yang belum begitu maju, semua sumur di bor secara vertikal kebawah. Pengeboran berarah lahir dan berkembang dari kebutuhan pengeboran lubang sumur ke berbagai arah, tidak hanya kebawah. Peralatan pengeboran khusus dan bermacam metode digunakan untuk mengubah arah pemboran dari vertikal ke arah tertentu atau bahkan kearah horizontal dengan tujuan untuk mencapai target yang tidak dapat dicapai dengan metode pemboran biasa. Program pemboran yang efisien harus didesain secara hati-hati. Desain dapat dikatakan sukses jika memiliki well path yang mudah untuk dibor, kesiapan untuk casing, dan menimalisir hole problem. Well path yang didesain pada sumur ini memiliki BUR sebesar 2.71°/100 ft dengan final inclination sebesar 15.42°. Sumur ini memiliki kedalaman target di 1875 ft dan total kedalaman di 2200 ft. Setelah well path selesai dibuat maka langkah selanjutnya adalah memilih bottom hole assembly yang tepat dan mendesain drillpipe agar sesuai dengan kondisi operasi pemboran sumur ini. Desain ini harus sesuai dengan parameter-parameter dalam pengeboran berarah seperti adanya kemungkinan collapse, adanya kemungkinan pipa putus, serta adanya drag dan torsi.

scholarly journals The concept of application of oscillation energy in modern technologies of directional drilling

2021 ◽  
Vol 230 ◽  
pp. 01017
Author(s):  
Miroslava Chernova ◽  
Yaroslav Kuntsiak
Keyword(s):  
Horizontal Well ◽  
Technology Development ◽  
Horizontal Wells ◽  
Energy Costs ◽  
Directional Drilling ◽  
Present Stage ◽  
Forward Motion ◽  
Oscillation Energy ◽  
Hydrodynamic Processes ◽  
Modern Technologies

In the process of research, there was investigated the question of influence of rotary movement of washing fluid on hydrodynamic processes with the purpose of enhancement of its transportation properties, especially in the process of drilling of horizontal wells. At present stage of science and technology development, improvement of effectiveness of drilling of horizontal wells is done at the expense of improvement of hydrodynamic circulation processes that prevent complications related to stability disturbances of well walls, formation of stagnation zones, and separation of sludge with significant reduction of energy costs. The matter of the article is related to the process of formation of stability of rotary-forward motion of washing fluid in the annulus of horizontal well directly by the energy of the flow, and also substantiation of methods of regulation of hydrodynamic parameters and flow structure with consideration of concrete geological and technical conditions.

scholarly journals Modeling and Experimental Study on Motion States of Laboratory-Scale Bottom Hole Assembly in Horizontal Wells

Energies ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 925
Author(s):  
Wei Li ◽  
Genlu Huang ◽  
Hongjian Ni ◽  
Fan Yu ◽  
Wu Jiang
Keyword(s):  
Numerical Simulation ◽  
Similarity Criterion ◽  
Horizontal Wells ◽  
Circular Motion ◽  
Rotary Drilling ◽  
Circular Arc ◽  
Bottom Hole ◽  
Drilling Engineering ◽  
Bottom Hole Assembly ◽  
Simulation Results

Motion states of bottom hole assembly (BHA) have a great effect on the trajectory control and drilling efficiency while rotary drilling. In order to study the motion states of BHA in horizontal wells, a BHA dynamic model with the finite element method was established. Meanwhile, an indoor experimental setup based on similarity criterion was designed and built to verify the numerical simulation results. Finally, the effects of measuring positions, rotate speeds, weight on bit (WOB), and friction coefficients on the motion states were analyzed in numerical simulation and experiment. The results show that the experimental results can match well with the numerical simulation results. The motion states of BHA in horizontal wells can be divided into three kinds, including circular arc swing, "8" shape swing, and dot-like circular motion. The circular arc swing mainly appears at middle section of BHA and occurs through the collective result of gravity and tangential friction. The dot-like circular motion mainly appears at near-bit or near-stabilizer area because drill bit and stabilizer can steady the BHA at the center part of the wellbore. The "8" shape swing mainly appears at the crossed area and occurs through collective disturbance of the other two motions. Moreover, rotate speed and friction coefficient have promotions on the lateral vibration while WOB have a much smaller effect. Through analyses, related suggestions are given for the drilling engineering. The related conclusions and suggestions in this paper can help to further understand the lateral dynamic characteristics of BHA in horizontal wells and select suitable parameters for drilling engineering.

7-inch Casing While Drilling CWD With Retrievable Bottom Hole Assembly BHA

2021 ◽  
Author(s):  
Askhat Radikovich Usmanov ◽  
Anton Mikhailovich Shishkin ◽  
Alexander Sergeevich Merzlyakov ◽  
Jalal Lalash Ogli Karimov ◽  
Anton Valeryevich Fedotov ◽  
...  
Keyword(s):  
Vertical Surface ◽  
Directional Drilling ◽  
Wellbore Instability ◽  
Lost Circulation ◽  
Bottom Hole ◽  
Drilling Technology ◽  
Long Time ◽  
Well Trajectory ◽  
Bottom Hole Assembly ◽  
Casing Drilling

Abstract Casing drilling technology, as an alternative to conventional drilling, has been known for a long time. This method is mainly used for wells with geological complications, such as lost circulation or wellbore instability of various nature. By using drilling on a string for a section or part of it, the problem interval is immediately cased, eliminating the time spent on additional operations, such as pulling the bottom hole assembly (BHA), wiper trips and running the casing. Thus, this allows to reduce the time for well construction, reduces the risk of accidents and non-productive time associated with the complication zone. Casing drilling has become widely for drilling vertical surface conductors and technical casing with a drillable shoe, as well as for drilling with retrievable BHA in inclined sections for 324- and 245-mm casing. The aim of this work was to perform directional drilling on a 178mm production casing in an interval where the client had geological problems associated with running casing due to a zone of rock collapse. The uniqueness of the task lies in the fact that no one in the world has yet performed drilling on a casing with a building inclination and landing into a horizontal plane. It was necessary to follow the designed well trajectory, to build inclination from 67 to 85 degrees with the planned dogleg severity of 1 degree / 10m.

Bottom Hole Assembly and Mud Motor for Directional Drilling

2014 ◽  
Vol 11 (SE) ◽  
pp. 201-206 ◽  
Author(s):  
B. Antony Fayaz ◽  
Akhil Sunny ◽  
Nazeel Nazeel
Keyword(s):  
Directional Drilling ◽  
Bottom Hole ◽  
Bottom Hole Assembly

Hydraulic Workover Unit Utilization for New Well Openhole Drilling with Directional Motor and Logging-While-Drilling Bottom-Hole-Assembly in M Area

2021 ◽  
Author(s):  
Buna Rizal Rachman ◽  
Bonar Noviasta ◽  
Timora Wijayanto ◽  
Ramadhan Yoan Mardiana ◽  
Esa Taufik ◽  
...  
Keyword(s):  
High Speed ◽  
Site Preparation ◽  
Hole Drilling ◽  
Drill Bit ◽  
Directional Drilling ◽  
Bottom Hole ◽  
Drilling Method ◽  
Bottom Hole Assembly ◽  
Space Limitation ◽  
Logging While Drilling

Abstract Achieving a number of well targets in M Area is an important objective for MK, one of the oil and gas operators in Indonesia. An economic challenge is present due to marginal gas reservoirs in shallow zone. The conventional swamp rig unit requires significant costs for site preparation work and in some cases no longer fulfils the economic criteria. The objective was to drill the same one-phase well (OPW) architecture as the swamp rig normally drills, but at lower costs using a hydraulic workover unit (HWU). Drilling the 8½-in hole section OPW architecture using HWU was challenging, not only on the equipment rating and capability, but also on the deck space limitation part. The fit-for-purpose directional and logging-while-drilling (LWD) system was utilized in this project consisting of customized low-torque excellent hydraulics drill bit design, a positive displacement motor (PDM) with aggressive bend setting to achieve directional objective (with max 3.8°/30-m dogleg severity), annular-pressure-while-drilling (APWD) measurement to ensure equivalent circulating density (ECD) is maintained, and combined electromagnetic propagation resistivity and sonic slowness measurement coupled with high-speed telemetry measurement-while-drilling (MWD) tool to get an accurate and timely formation evaluation. The HWU deck space limitation was solved by implementing a single combined directional drilling (DD), MWD, mudlogging cabin, in addition to the remote operation control implementation to further reduce carbon footprint. Five wells were drilled safely and successfully in this campaign. Drilling efficiency improved with up to 109% ROP increase as compared to the first well, showing the progressive learning curve and excellent teamwork from all involved parties. The directional bottom hole assembly (BHA) was capable of delivering up to 4–5°/30-m dogleg, not only achieving the directional objective, but also penetrating the reservoir targets with tight tolerances. The drill bit delivered very good ROP, reaching 60.4 m/h (about 66% of average OPW ROP achieved by swamp rig). This campaign also successfully reduced the overall site preparation cost by up to 30%, enabling MK to drill wells that were initially not feasible to be drilled using swamp rig within the time frame and budget. Thanks to the success, this new method is currently under study for industrialization. The HWU drilling campaign provided a valuable learning experience, is considered as a proven drilling method, and served as a benchmark for other operators in Indonesia. HWU drilling has proven to be an efficient drilling method and capable of delivering the one-phase-well. This paper presents a unique case study of new well open hole drilling with the HWU and its applicability in M Area. Most studies in the past were HWU drilling in re-entry or sidetrack cases.

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