Effects of the formation to the orientation of the directional wells in the Adıyaman region

Ünlü, Ahmet
Directional drilling is controlling the inclination and azimuth of a wellbore to reach a predetermined underground target and is a method used widely nowadays. There are various methods for directional drilling operations such as; Mud Motor & Measurement While Drilling System (MWD) or Rotary Steerable System to reach the targets. Within the scope of this study, Mud Motor and MWD were used to change orientation of the hole. While drilling with mud motor, directional drillers (DD) make sliding drilling which means that DD drill with a mud motor rotating the bit downhole without rotating the drill string from the surface with using Tool-face which is taken from MWD system. Controlling hole orientation is important to drill smooth wells, to follow the plan with low tortuosity, to hit the target and to finish the well early. Several studies have been performed to investigate the parameters that affects the hole orientations. The factors affecting the orientation of the hole are weight on bit (WOB), bottom hole assembly (BHA), hole size, rotary speed (RPM), flow rate (GPM), stabilizers position on the drill string, drilling bit and stabilizers gauge. In addition to all of these parameters, orientation of the wells is also affected from the formation properties. This study detailed the effects of the formations to the orientation of the directional wells in the Adıyaman Region with the help of the field data. Even if the same parameters (WOB: 10-11 tones, flow rate: 450 gpm, RPM:40) are applied and the same equipments (8-3/8” of outer diameter sleeve stabilizer, 7-3/4” of outer diameter integral blade stabilizer, equal length of drill collars, roller cone drilling bit) are used in seven different wells to drill 8.5” (0.216 m) hole in diameter, theoretical expectations with respect to the orientation may not be obtained due to the formation effects. To see this effect, North/South and East/West deviations were calculated according to the wellhead location with the real and the calculated survey data. Real survey data were taken from the wells for every 30 m interval with the help of the MWD system. Moreover, data used for theoretical deviation calculation were obtained with using the output dog-leg of the Mud Motor. The differences between real and calculated results show the effect of the formation to the orientation and this gives us a chance to see if there is a trend or not between the wells when respective results are compared. As a result of this study, it was observed that there is a trend in the effect of the formation on the orientation in the Adıyaman Region. The direction and the deviation of the wells change for different wells although the formation has the same lithology. Moreover, the results show that when a well is drilled in a certain wellhead location in this region, the direction does not change from top to the bottom of the section.


Trajectory estimation in directional drilling using bottom hole assembly(bha) analysis
Doğay, Serkan; Kök, Mustafa Verşan; Department of Petroleum and Natural Gas Engineering (2007)
The aim of this study is to combine the basic concepts of mechanics on drill string which are related to directional drilling, thus finding a less complicated and more economical way for drilling directional wells. Slick BHA, which has no stabilizers attached and single stabilizer BHA are analyzed through previously derived formulas gathered from the literature that are rearranged for this study. An actual directional well is redrilled theoretically with a slick BHA and a computer program is assembled for c...
Effects of different bed roughnesses on the characteristics of hydraulic jumps
Velioğlu, Deniz; Tokyay, Nuray; Department of Civil Engineering (2012)
In practice, baffle blocks and sills are commonly being used to stabilize the location of a hydraulic jump and shorten the length of a stilling basin. On the other hand, gravels, corrugations and rectangular prismatic roughnesses which cover the entire length of the basin or placed in a staggered manner may be an alternative. The objective of this study is to determine the effects of these roughness elements on the characteristics of hydraulic jumps such as conjugate depth, jump length and energy dissipatio...
Effects of polymers and CMC concentration on rheological and fluid loss parameters of water-based drilling fluids
Iscan, A. G.; Kök, Mustafa Verşan (2007-01-01)
Fluid loss during drilling operations has a very significant effect on both reservoir formation damage and monetary terms. There are many additives to control this unwanted phenomenon. Nevertheless, most of these substances are artificial chemicals. Thus, they are not only expensive, but also hazardous to the environment. In this article, a more natural method was applied to overcome the higher filtration problems by employing carboxyl methyl cellulose (CMC) and polymers (XT), DSHV, and MAC PR. Drilling flu...
Determination of cuttings transport properties of gasified drilling fluids
Ettehadi Osgouei, Reza; Mehmetoğlu, Mustafa Tanju; Özbayoğlu, Mehmet Evren; Department of Petroleum and Natural Gas Engineering (2010)
The studies conducted on hole cleaning have been started with single phase drilling fluids for vertical holes in 1930’s, and have reached to multiphase drilling fluids for directional and horizontal wells today. The influence of flow rate and hole inclination on cuttings transport has been well understood, and many studies have been conducted on effective hole cleaning either experimentally or theoretically. However, neither the hydraulic behavior nor the hole cleaning mechanism of gasified drilling fluids ...
Torque and drag applications for deviated and horizontal wells: a case study
Çağlayan, Burak Kağan; Kök, Mustafa Verşan; Eren, Tuna; Department of Petroleum and Natural Gas Engineering (2014)
One of the most critical limitations during hydrocarbon exploration, especially during directional drilling, is torque and drag generated by the contacts between the drill string and the borehole or casing. Therefore, torque and drag analysis and calculations are very important for well design to prevent equipment and economical losses. Proper modeling is highly important to predict and prevent downhole problems related to drill string and borehole, beforehand commencing to the activities if not during the ...
Citation Formats
A. Ünlü, “Effects of the formation to the orientation of the directional wells in the Adıyaman region,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Petroleum and Natural Gas Engineering., Middle East Technical University, 2020.