1, how to calculate the drill turns allowed?
Answer: the calculation formula is as follows:
N=KH
Type: N - to allow drill pipe turns, circle.
K (the torsion coefficient according to the use of drill pipe steel grade and thickness of the look-up table).
H refers to the card point depth meter.
2.What is the role of a short trip?
Answer: (1) in the process of drilling, a short trip to the new borehole drilling hole to ensure timely cleaning, avoid smoothly, footage too much longer to drill out the piston.
(2), in directional wells, through a short trip, the timely removal of sand bed is formed on the lower wall, to prevent sticking.
(3), after the drilling in hydrocarbon reservoir, before the drilling, make a short trip, can grasp the flow rate of oil and gas, so as to understand the balance of mud column pressure, prevent static caused by long time, well kick and blowout.
(4) in electrical measurement before the short play, in addition to the above effect, but also through the short trip about suspension ability in the process of drilling in short bottom sand and the number of mud, so as to formulate specific measures to ensure the success of electrical measurement.
3, oil and gas upwardvelocity calculated?
Answer: V=H/T
Where: H=H1 - H2
The displacement of H2= (l/s) x is not gas cut mud return time (s) / per meter borehole volume (l/m)
Type: V - oil and gas flow rate, M / h.
The height of the oil and gas channeling H, M.
T - hour rest time.
H1 - reservoir depth meter.
H2 - no gas cut mud depth meter.
4, how to calculate the weighting agent?
Answer: Type: X - the need to increase the weight of material, tons.
R pulp density, g/cm3.
R1 - increase the material density, g/cm3
R2 to g/cm3 with mud density.
V - for increased volume of pulp, Party
5.What is the use of adding to the drill pipe?
Answer: increase the drill pipe and the main difference is that the ordinary drill pipe wall thick pipe 127mm diameter and wall thickness of 24.5mm, at the same time, the middle part of the heavy weight drill pipe diameter increased, the diameter of 139.7mm. This drill has the following purposes:
(1), can replace part of the drill collar, improve drilling depth of drilling rig.
(2) and effectively used in curved wellbore, replace the drill pipe, because of its high stiffness, can reduce wear and fatigue failure of drill string.
(3), as the transition section of drill collar and drill pipe, drill pipe and drill collar to prevent joints due to stress concentration caused wear and fatigue failure of drill string.
(4), in directional wells instead of a part of the drill collar, with wall contact area is small, can reduce the torque and resistance and the possibility of differential pressure sticking. It is more important to enhance the stability of directional well position, the use of drill collar, rotation and shaft have great friction, the borehole deflection trend, with the wall thickness of drill pipe can reduce this possibility.
6.What is the use of spiral drill collar?
Answer: in the deep wells, directional wells, due to the high density of drilling fluid, borehole bending, drill collar is easy to stick in the wall caused by differential pressure sticking, drill collar screw into a braided, greatly reducing the contact area with the curved borehole (the area only with the size of the light collar contact area, it is 42%) to prevent or avoid differential pressure sticking.
7, what is the casing accident?
Answer: in the process of casing or cementing, casing fracture, casing thread off or casing to the accident, referred to as casing accidents.
8, after the well casing sent to check what content?
Answer: (1) identify, send wells total root number, total length of preliminaryascertain.
(2), manufacturer, country, standard, steel grade wall thickness measurement of the length of the data record, and respectively arranged.
(3), visual inspection, damage, deformation, bending, thread damage, corrosion, cracks, delamination etc..
(4), through the examination, can use the standard by passimeter.
(5), conditional word detection.
9, site storage casing should pay attention to what?
Answer: (1), no electric welding operation in the casing above.
(2), hard metal objects do not hit the casing.
(3), shall be discharged in the double pipe rack distance of 6~7 meters, if the multilayer emissions on alignment pad bar.
(4), should press the order to arrange the order of wells.
(5), are not allowed to put any items inside the casing.
(6), should not be used.
10, before the well casing should pay attention to what?
Answer: (1) and electrical measurements after drilling well, well drilling by BHA light drill collar 2~3 column, bit nozzle as large as possible, not even.
(2), drilling well in the end, with large displacement well flushing 2~3 weeks to ensure wellbore clean casing smoothly in the end.
(3), to adjust the mud property plus the amount of lubricant to friction mud straight well within 0.15 directional wells in less than 0.10.
11.Why, to two times lower casing diameter?
Answer: the casing may occur in the following site during parking:
(1), the casing may accidentally smashed flat, but the cementing plug.
(2) and the casing into gloves, sticks, crowbars and other debris, blocking the choke ring hole circulation barrier.
12, the casing should pay attention to what?
Answer: (1), with sleeve cap, wear pin protector wire. (2), do two times size check.
(3) balance, pull on the floor.
(4), the quasi steady good buckle buckle, rotating rope clamp closely fastened to the specified torque.
(5), slow up the balance of decentralization. (Note 6), according to the provisions of the filling slurry.
(7), painted a good oil casing thread. (8) check, clamp marks, slip mark.
(9), reliability accuracy and installation accessory position to control the design check.
13, when our operation casing pay attention to what?
Answer: (1), the operation should be smooth, prevent travel car radial swing.
(2), shall be put under the control of violent pulling, casing drilling speed, prevent.
(3), according to the specified torque closely.
(4), pay attention to rig the post operation personnel safety, act according to the rules.
(5), the problem occurs, must actively in the jurisdiction and report for instructions.
(6), safety inspection tools and ropes.
(7), always pay attention to the reliability of the braking system.
(8), always pay attention to changes in the hanging weight.
14, the casing before check what should be done?
Answer: (1), there is no abnormal power and transmission system. (2), lifting and braking system is safe and reliable.
(3), the tool is complete, easy to use, rope safety. (4), whether there is sufficient standard thread compound.
(5), the total number of order and review the casing without change of casing appearance to further review.
(6), casing accessories are complete, the number is enough. (7) no debris, floor area of operation, easy to operate.
(8), and the number of standard bore gauge must be accurate. (9), flexible and easy to use, accurate instrument adjustment.
(10), mud pump in normal operation, good water. (11), meet the requirements of casing mud performance.
(12), the preparatory work will require cooperation according to cementing ready (such as: preparation, quality and quantity of water cement slurry cementing performance test etc.).
15, when the casing casing filled with drilling fluid on time and why?
Answer: because the casing, the choke ring in the role of the drilling fluid can enter the casing, the casing is filled with air. So, the following situations occur:
(1), the buoyancy of the drilling fluid, casing down slowly, not even into the influence of decentralization, efficiency.
(2), because of the drilling fluid column pressure, when the casing to a certain depth, collapsing force pressure of drilling fluid column is greater than that of casing, casing damage.
(3), nylon ball by the upward pressure, when the pressure is large enough the nylon ball is pressed into a deep impression. With the increase of pressure, deepen the impression. When the nylon ball seat sealing position changes, because the imprint effect cannot effectively prevent the liquid back pipe. So, after cementing cement slurry can flow into the casing in a cement plug.
(4), when the pressure is greater than the pressure bearing capacity of nylon ball when the nylon ball is damaged, causing rapid mud intrusion into the casing, the wellbore level decreased rapidly, making the hole and out of balance, causing the collapse of the death card sleeve.
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