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How to prevent the drill from getting stuck
Release time:
2021-08-17
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First, when drilling, the downhole drill bit shall not exceed 50KN, the directional well shall not exceed 100KN, and the vertical well and directional well shall not exceed 50KN. (A specific wellbore sequence can be a specific analysis data) Second, surface drilling should ensure sufficient cyclic displacement to completely transport and remove cuttings. After drilling the material, short-term take-off and landing operations should be done to ensure that the wellbore is unblocked; before the formal start of drilling, inject pre-hydrated and thickened mud with a viscosity of 50-60s (the specific amount depends on the size and depth of the hole), To suspend the remaining drill cuttings in the well and prevent drill bit resistance and adhesion. Article 3, in
First, when drilling, the downhole drill bit shall not exceed 50KN, the directional well shall not exceed 100KN, and the vertical well and directional well shall not exceed 50KN. (A specific borehole sequence can be a specific analysis data)
Second, surface drilling should ensure sufficient cyclic displacement to completely transport and remove cuttings. After drilling the material, short-term take-off and landing operations should be done to ensure that the wellbore is unblocked; before the formal start of drilling, inject pre-hydrated and thickened mud with a viscosity of 50-60s (the specific amount depends on the size and depth of the hole), To suspend the remaining drill cuttings in the well and prevent drill bit resistance and adhesion.
Third, before connecting a single drill bit, pay attention to the additional pulling force of the drilling tool. In case of blockage, do not blindly connect a single drill bit, but completely circulate and adjust the mud.
Fourth, mud purification requirements: to ensure the operation and effectiveness of the solid control system. The sand content should be controlled below 0.5% using a high mesh vibrating screen and a good centrifuge to remove undesirable solids in the drill bit.
Article 5, in order to maintain sufficient pump displacement of the drill bit, the pump displacement must be greater than 60l / s for conductive 444.5mm holes, 55-60l / s for conductive 311.1mm holes, 35-40 l / s for conductive 241.3mm holes, and 28-32l / s for 215.9mm conductive holes.
Article 6. In oil wells that allow oil mixing, the oil content in the drill bit well fluid should be maintained at 5-8% to meet the requirements of lubrication and anti-clogging.
Article 7, after drilling a drill bit, drill once or twice, and circulate appropriately to make the cuttings at the bottom of the hole return higher, so as to avoid sinking into the mud and drill bit and causing the centralizer position.
Article 8. Requirements for multi-point test: The test can only be carried out after confirming the normal downhole conditions of the drill bit (such as suspension weight and circulating pump pressure).
Article 9, when drilling, if there is a large torque, the drag force and drag force are large in the process of drilling up and down, or the adhesion phenomenon occurs when connecting a single root, add plastic beads, extreme pressure lubricant, etc., To achieve the purpose of anti-sticking of the drill bit.
Article 10. During the orientation process, if the lens is relatively slow, you should pay attention to moving the drill frequently to prevent the drill from getting stuck without moving for a long time. In case of the phenomenon of supporting bit pressure, lubricant should be added in time, and the short stroke should be made to dredge the hole and increase the lubricity of the wall.
Article 11. Before drilling in the open hole part, the drill bit should be fully circulated and started in the first gear. In case of suction or blockage, the drill bit should be connected to the squaredrill pipe(Top drive) Grout or backstroke, and do not force.
Article 12, in the oblique section of the drill bit or the torsion bearing hole, raise the valve to this position by using low speed, and often pick the valve. Note that it is found that the card carries no more than 50 kn of the normal weight. Finally, try to drill out the method with drilling force, and use the method of water at intervals to destroy the keyway.
Article 13, the static time of the drill in the open hole shall not exceed 5 minutes. When circulating drilling fluid, machine maintenance or other situations that require stopping drilling, please keep the drilling tool in motion.
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