In the deep gas field of the Dongh (Offshore), large-Extended Reach Well & Slimhole wells are characterized by ultra-deep wells and significant well deviation. The characteristics of large-Extended Reach Well, The wellbore trajectory is complex, resulting in large forces between the drill pipe and the casing/wellbore wall, which leads to increased torque (friction). (KQT-A11 well, depth 8001m) deep drilling Friction issues were prominent during the drilling process. At a depth of 7,650 m, the torque peaked at 70 kN•m. Extremely high torque generates big challenges to operational safety; the operator has adopted the system of oil-based drilling fluids while the mechanism of Oil-Based Lubricant is not clear: The lubrication, friction reduction, and anti-wear mechanisms at the interface between Oil-Based Lubricant and metal (drill pipe/casing) and rock (wellbore wall) are complex, involving multiple aspects such as fluid dynamics, boundary lubrication, adsorption, and reactions.
Operator current using Oil-Based Lubricant weakness: Existing lubricants may only be effective under specific conditions. Under harsh conditions such as high temperature, high pressure, deep wells, and complex formations, their performance deteriorates rapidly, failing to provide continuous and effective lubrication. The operator current using lubricants fail to effectively reduce drilling friction, leading to lower drilling speed, significant equipment wear, and a high risk of drill bit sticking.
In view of the problem of high friction torque in deep wells with large-Extended Reach Well in the East China Sea (offshore), MECO have developed high-efficiency oil-based lubricants, and supplied to the operator. A successful oil-based drilling fluid with reduced oil content was reached. Have got coefficient of squeezing lubrication, the coefficient of mud cake adhesion, and got improvement of wear resistance and the enhancement of system lubrication reduction. The high efficiency oil-based lubricant ME-LUBE OB with high resistance performance were reached.
The performance of ME-LUBE-OB: When operator drilled reaching to 6988m, the torque fluctuated between 45 and 75 kN·m. After adding 2.0% PF-LUBEOB to the drilling fluid, drilling down to 7009.56m, during 4 hours the torque fluctuated between 42 and 71 kN·m. with the torque fluctuation value decreasing by 3-4 kN·m.
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