We supply slick drill collars, spiral drill collars and non-magnetic drill collars; their sizes are from 3-1/8 to 11 inches. Besides the drill collars in the table below, we can supply other drill collars at customers' request.
Drill collar provides weight to the bit for drilling and keep the drill string from buckling. Additionally, drill pipe should not run in compression because it can get seriously damaged therefore we need to know weight of drill collar that is enough to provide weight to the bit.
Drill Collar Weight
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A component of a drillstring that provides weight on bit for drilling. Drill collars are thick-walled tubular pieces machined from solid bars of steel, usually plain carbon steel but sometimes of nonmagnetic nickel-copper alloy or other nonmagnetic premium alloys.
The bars of steel are drilled from end to end to provide a passage to pumping drilling fluids through the collars. The outside diameter of the steel bars may be machined slightly to ensure roundness, and in some cases may be machined with helical grooves ("spiral collars"). Last, threaded connections, male on one end and female on the other, are cut so multiple collars can be screwed together along with other downhole tools to make a bottomhole assembly (BHA). Gravity acts on the large mass of the collars to provide the downward force needed for the bits to efficiently break rock. To accurately control the amount of force applied to the bit, the driller carefully monitors the surface weight measured while the bit is just off the bottom of the wellbore. Next, the drillstring (and the drill bit), is slowly and carefully lowered until it touches bottom. After that point, as the driller continues to lower the top of the drillstring, more and more weight is applied to the bit, and correspondingly less weight is measured as hanging at the surface. If the surface measurement shows 20,000 lbm [9,080 kg] less weight than with the bit off bottom, then there should be 20,000 pounds force on the bit (in a vertical hole). Downhole MWD sensors measure weight-on-bit more accurately and transmit the data to the surface.
As an expert in oilfield equipment, Vigor is often asked - how much does a drill collar weigh? its weight is a critical factor that can impact drilling performance and wellbore stability. An editor from Vigor will provide a detailed overview of sizing, weight calculations, and how collar dimensions influence their mass.
Drill collars are thick-walled, heavy tubular that are used in the drill string immediately above the drill bit. They provide stiffness and weight on the bit to aid directional control and drilling efficiency. Heavier collars exert more force on the bit to crush rock and keep the hole vertical. Their weight also increases the tensile strength of the drill pipe to prevent buckling. Generally, longer and heavier collars are preferred for deeper wells and more challenging drilling environments. Typical collar lengths range from 30 to 90 feet.
Longer drill collars provide more stability by increasing the flexural rigidity and critical buckling load. However excess length also raises bending stresses along the collar and applied loads on the drill pipe. Typical drill collar lengths for various hole sizes are:
Its weight is a function of its dimensions, material density, and length. Heavier collars improve drilling performance but also increase stresses and loads. Careful selection of collar size and weight, optimized for the well design and trajectory, is key to efficient and stable drilling. Drill collar manufacturers can provide further recommendations based on their extensive application expertise. Vigor navigates your oilfield solutions!
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In oil and gas drilling, the bottom hole assembly (BHA) contains specialized components like drill collars and heavy-weight drill pipe (HWDP) to add weight and stiffness. While their purpose seems similar, these technologies have distinct designs and functional differences that suit specific drilling needs.
They are thick-walled, heavy steel tubes that connect directly above drill bits to exert maximum downward force. Weighing up to 100 pounds per linear foot, collars increase the overall mass of drill strings for heavier effective weight on bit (WOB). This extra gravity-fed push keeps bits pressing hard into formation for faster penetration rates.
Collars also stabilize wellbores; their thick tubular walls offer enhanced stiffness up to 20 times the rigidities of standard drill pipe. Limiting flex and vibration enables the transmission of clean rotational power to drill bits at the end. Such high ciscompressinal strength makes collars well-suited for deviated drilling where tubular elasticity can cause problems.
In contrast, HWDP acts as ultra-heavy drill pipe joints installed periodically in longer horizontal wellbores for intermediate reinforcement. HWDP averages 50-60 pounds per foot, making it heavier than drill pipe but lighter than 100+ lb/ft collars. However, integrating HWDP joints every 90 feet boosts overall string weight substantially.
More critically, HWDP has thick, reinforced wall strength similar to near-bit collars. High torque capacity and resistance to compression outfit HWDP to handle extreme tensile stresses over horizontal distances that normal pipes cannot endure. HWDP also resists buckling failure that can collapse long small-diameter hole sections.
While drill collars and HWDP both increase drill string weight, HWDP provides targeted heavy strength through laterals where collars cannot reach. Integrating the two technologies based on needs delivers optimal weight on bit plus the endurance to drill extreme well paths. If you need procurement solutions, please contact us at info@vigorpetroleum.com.
Designed to place weight on the drill bit and pump drilling fluids, our drill collars are integral heavy-wall joints manufactured from a solid bar of modified alloy steel. The solid bars are quenched and tempered to obtain the required mechanical properties and then trepanned, drifted, and threaded. Our drill collars are furnished as slick or spiraled; spiraled drill collars have grooves machined in the outside surface that promote the even flow of drilling fluid around the drill collar diameter, equalizing pressure and reducing the occurrence of differential sticking.
We inspect all our drill collars to comply with API standards and Grant Prideco specifications. These inspections include visual dimensional checks as well as ultrasonic inspections over the entire length of the drill collar.
We offer optional slip and elevator recesses to improve handling efficiency and safety. The upper radius of the elevator recess is cold-rolled to increase product fatigue life. Slip and elevator recesses can be used together or separately. Unless otherwise specified, slip and elevator recesses are machined in compliance with API Spec. 7-1.
Tensile properties are determined by tests on cylindrical specimens conforming to the requirements of the current ASTM A370, 0.2% offset method. Hardness tests are performed on the OD of drill collars in compliance with current ASTM standards.
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A drilling jar is a downhole tool that delivers an axial impact load to the stuck point of a drill string. Jars are often the first line of defense against stuck pipe and can save operators from costly fishing and remedial operations by quickly "jarring" the string free.
Modern drilling jar designs are double-acting hydraulic, i.e., they are capable of delivering an upward or downward impact load to the stuck point by raising or lowering the drill string from the surface. Placement of drilling jars in the bottom hole assembly (BHA) is a critical step in drill string design and will ensure maximum effectiveness of jars in the event of a stuck pipe scenario.
Jars are often placed in the upper portion of the BHA, usually in the drill collars or heavy weight drill pipe (HWDP). Depending on the wellbore, drilling jars can run in either tension or compression. In vertical or low angle wells, jars will typically run in tension since there is sufficient weight below the jar to keep it fully extended. In highly deviated or extended reach lateral wells, jars will run in compression where there is insufficient weight below the jar to keep it in tension.
Any downhole stroking tool, such as a drilling jar, is more susceptible to bending stress failures than a continuous joint, such as a drill collar or HWDP. Because of this, it is important that a jar is safely embedded within the drill collars or HWDP, and never at the crossover point between the two components.
To minimize bending stress, place jars at least two joints above or below this crossover point. The bending stress ratio (BSR) of drilling jars is more compatible with HWDP than drill collars, so it is recommended to place jars within the HWDP if possible.
Since jars are activated through axial motion of the drill string, it is critical that a jar is placed above any potential stuck point. If the drill string becomes stuck above the jar, then the jar will be rendered inoperable since axial loads can no longer be transferred to the jar.
Furthermore, if jars are placed below stabilizers or reamers in close proximity, a fulcrum is created at the blades or rollers that may induce severe bending stress at the jar, especially in highly deviated wells. 152ee80cbc
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