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Search Petrowiki: DLS
...Glossary:DLS PetroWiki Dog leg severity...
Petrowiki
Technology:
- Information Technology > Knowledge Management (1.00)
- Information Technology > Communications > Collaboration (1.00)
...Retrieved from "https://petrowiki.org/index.php?title Glossary:DLS&oldid 39648"...
Petrowiki
Technology:
- Information Technology > Knowledge Management (1.00)
- Information Technology > Communications > Collaboration (1.00)
...1 Sidetrack * 2.2 Steerable drilling and kickoff * 3 Medium-radius applications (6 to 15 /100 ft DLS) * 4 Intermediate- and short-radius applications * 5 Rotary steerable systems (RSS) * 6 Adjustab...culate the build/drop/turn rates of the motor assemblies.Fig. 1 shows the expected Dogleg Severity (DLS) and the bit side forces for a two-stabilizer motor assembly. * Fig. 1--The effect of the bent-ho...to ensure that they are less than the endurance limit. Medium-radius applications (6 to 15 /100 ft DLS) The vast majority of medium-radius drilling is undertaken in hole sizes of 12¼ in. and less with...
The most common deviation tools for directional drilling are steerable motor assemblies (or so-called positive-displacement motors [PDMs]) and rotary steerable systems (RSSs). Adjustable-gauge stabilizers, known as "2D rotary systems," have become quite popular to run with the rotary and PDM assemblies to control inclination. Whipstocks, especiallycasing whipstocks, are used routinely to sidetrack out of cased wellbores. Other tools, such as turbines, are used mainly in Russia, and jetting bits are seldom used today. Power delivered to the bit * 2 PDM applications in directional drilling * 2.1 Sidetrack * 2.2 Steerable drilling and kickoff * 3 Medium-radius applications (6 to 15 /100 ft DLS) * 4 Intermediate- and short-radius applications * 5 Rotary steerable systems (RSS) * 6 Adjustable-gauge stabilizers (AGSs) * 7 Whipstocks * 8 Turbines * 9 Jetting bits * 10 Nomenclature * 11 References * 12 See also * 13 Noteworthy papers in OnePetro * 14 External links * 15 Category The most important advancements in trajectory control are the steerable motor assemblies, which contain PDMs with bent subs or bent housing.
Petrowiki
adjustable-gauge stabilizer, agss, application, asia government, assembly, bearing, bearing assembly, bent sub, configuration, directional drilling systems and equipment, Drilling Conference, Drilling Equipment, drilling operation, europe government, inclination, knowledge management, presented, rotation, russia government, russian government, shaft, stabilizer, torque, trajectory, united states government, Upstream Oil & Gas, wellbore, whipstock
Country:
- North America > United States (0.29)
- Europe > Russia (0.25)
- Asia > Russia (0.25)
SPE Disciplines:
Technology:
- Information Technology > Knowledge Management (0.50)
- Information Technology > Communications > Collaboration (0.40)
...vertical depth [TVD] is unaffected), whereas the minimum-curvature method uses the Dogleg Severity (DLS) to calculate displacements in both planes. Minimum curvature is considered to be the most accurate...
There are several known methods of computing directional survey. The five most commonly used are: tangential, balanced tangential, average angle, curvature radius, and minimum curvature (most accurate).[1] This method uses the inclination and hole direction at the lower end of the course length to calculate a straight line representing the wellbore that passes through the lower end of the course length. Because the wellbore is assumed to be a straight line throughout the course length, it is the most inaccurate of the methods discussed and should be abandoned completely. Modifying the tangential method by taking the direction of the top station for the first half of the course length, then that of the lower station for the second half can substantially reduce the errors in that method.
Petrowiki
Technology:
- Information Technology > Knowledge Management (0.42)
- Information Technology > Communications > Collaboration (0.42)
...ate the TVD of the various formations to allow geological mapping * Evaluate the Dog Leg Severity (DLS), which is the total angular inclination and azimuth in the wellbore, calculated over a standard le...
The method used to obtain the measurements needed to calculate and plot the 3D well path is called directional survey. MD is the actual depth of the hole drilled to any point along the wellbore or to total depth, as measured from the surface location. Inclination is the angle, measured in degrees, by which the wellbore or survey-instrument axis varies from a true vertical line. An inclination of 0 would be true vertical, and an inclination of 90 would be horizontal. Hole direction is the angle, measured in degrees, of the horizontal component of the borehole or survey-instrument axis from a known north reference.
Petrowiki
Technology:
- Information Technology > Knowledge Management (0.42)
- Information Technology > Communications > Collaboration (0.42)
...ubulars. Smaller holes with more-flexible tubulars have a higher allowable maximum dogleg severity (DLS). Short-radius horizontal wells have build rates of 5 to 10 /3 ft (1.5 to 3 /ft), which equates to... wells. * Calculate the TVD of the various formations to allow geological mapping. * Evaluate the DLS, which is the total angular inclination and azimuth in the wellbore, calculated over a standard len...ment in the horizontal plane (the TVD is unaffected), whereas the minimum-curvature method uses the DLS to calculate displacements in both planes. Minimum curvature is considered to be the most accurate ...
Directional drilling is defined as the practice of controlling the direction and deviation of a wellbore to a predetermined underground target or location. This section describes why directional drilling is required, the sort of well paths that are used, and the tools and methods employed to drill those wells.
Petrowiki
accuracy, application, assembly, azimuth, Directional Drilling, drilling operation, earth, gravity accelerometer, gyro, inclination, information, instrument, interference, knowledge management, latitude, magnetic surveying, penetration, real time system, stabilizer, survey article, tendency, trajectory design, united states government, Upstream Oil & Gas, well planning, wellbore
Oilfield Places:
- North America > United States > Texas > West Gulf Coast Tertiary Basin > Austin Chalk Formation (0.98)
- North America > United States > Texas > Sabinas - Rio Grande Basin > Austin Chalk Formation (0.98)
- North America > United States > Texas > East Gulf Coast Tertiary Basin > Austin Chalk Formation (0.98)
- (7 more...)
SPE Disciplines:
- Well Drilling > Well Planning > Trajectory design (1.00)
- Well Drilling > Drilling Operations > Directional drilling (1.00)
Technology:
...e * Glossary:Diversion * Glossary:Diverter * Glossary:Division order * Glossary:DLL * Glossary:DLS * Glossary:DMD * Glossary:DMO * Glossary:DMUR * Glossary:DMZ * Glossary:DNL * Glossary:DnV *...
The following 200 pages are in this category, out of 288 total.
Petrowiki
SPE Disciplines:
Technology:
- Information Technology > Knowledge Management (0.42)
- Information Technology > Communications > Collaboration (0.42)
...ubulars. Smaller holes with more-flexible tubulars have a higher allowable maximum dogleg severity (DLS). Short radius horizontal wells Short-radius horizontal wells have build rates of 5 to 10 /3 ft ...
Horizontal wells are high-angle wells (with an inclination of generally greater than 85) drilled to enhance reservoir performance by placing a long wellbore section within the reservoir. Horizontal Well contrasts with an extended-reach well, which is a high-angle directional well drilled to intersect a target point. There was relatively little horizontal drilling activity before 1985. The Austin Chalk play is responsible for the boom in horizontal drilling activity in the U.S. Now, horizontal drilling is considered an effective reservoir-development tool.[1] Horizontal wells are normally characterized by their buildup rates and are broadly classified into three groups that dictate the drilling and completion practices required, as shown inTable 1. * The "build rate" is the positive change in inclination over a normalized length (e.g., 3 /100 ft.)
Petrowiki
Oilfield Places:
- North America > United States > Texas > West Gulf Coast Tertiary Basin > Austin Chalk Formation (0.98)
- North America > United States > Texas > Sabinas - Rio Grande Basin > Austin Chalk Formation (0.98)
- North America > United States > Texas > East Gulf Coast Tertiary Basin > Austin Chalk Formation (0.98)
- (6 more...)
Technology:
- Information Technology > Knowledge Management (0.41)
- Information Technology > Communications > Collaboration (0.41)
...ubulars. Smaller holes with more-flexible tubulars have a higher allowable maximum dogleg severity (DLS). Short-radius horizontal wells have build rates of 5 to 10 /3 ft (1.5 to 3 /ft), which equates to ...lication. The important considerations are as follows: Medium-Radius Applications (6 to 15 /100 ft DLS). The vast majority of medium-radius drilling is undertaken in hole sizes of 12¼ in. and less with ...
Introduction Directional drilling is defined as the practice of controlling the direction and deviation of a wellbore to a predetermined underground target or location. This section describes why directional drilling is required, the sort of well paths that are used, and the tools and methods employed to drill those wells. A directional well can be divided into three main sections--the surface hole, overburden section, and reservoir penetration. Different factors are involved at each stage within the overall constraints of optimum reservoir penetration. Most directional wells are drilled from multiwell installations, platforms, or drillsites. Minimizing the cost or environmental footprint requires that wells be spaced as closely as possible. It has been found that spacing on the order of 2 m (6 ft) can be achieved. At the start of the well, the overriding constraint on the well path is the presence of other wells. Careful planning is required to assign well slots to bottomhole locations in a manner that avoids the need for complex directional steering within the cluster of wells. At its worst, the opportunity to reach certain targets from the installation can be lost if not carefully planned from the outset. Visualizing the relative positions of adjacent wells is important for correct decisions to be made about placing the well path to minimize the number of adjacent wells that must be shut in as a safety precaution against collisions. The steel in nearby wells requires that special downhole survey techniques be used to ensure accurate positioning. This section is generally planned with very low curvatures to minimize problems in excessive torque and casing wear resulting from high contact forces between drillstrings and the hole wall.
Petrowiki
accuracy, application, assembly, azimuth, bit side force, build rate, Directional Drilling, drilling operation, hole direction, inclination, information, instrument, interference, knowledge management, latitude, low side, magnetic field, side force, stabilizer, survey error, tendency, trajectory design, Upstream Oil & Gas, well planning, wellbore
Oilfield Places:
- North America > United States > Texas > West Gulf Coast Tertiary Basin > Austin Chalk Formation (0.98)
- North America > United States > Texas > Sabinas - Rio Grande Basin > Austin Chalk Formation (0.98)
- North America > United States > Texas > East Gulf Coast Tertiary Basin > Austin Chalk Formation (0.98)
- (7 more...)
SPE Disciplines:
- Well Drilling > Well Planning > Trajectory design (1.00)
- Well Drilling > Drilling Operations > Directional drilling (1.00)
Technology:
- Information Technology > Knowledge Management (0.40)
- Information Technology > Communications > Collaboration (0.40)
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