20 different types of drilling situation and solution 2

11.What problems should we pay attention to when drilling in the upper soft strata?

(1) When drilling under the upper formation, the drill bit should be pulled out, the Taper Taps should be changed, and the drill pipe should be connected to the hole.

(2) Maintain good fluidity and sand carrying performance of drilling fluid;

(3) To punch, pass mainly, can be properly drawn;

(4) Power drilling is strictly prohibited;

12. What is the reason for not opening the pump after drilling? How to deal with it?

The reasons are:

(1) there is dirt in the drilling tool or things falling in the drilling tool block the drill hole;

(2) drilling down speed is too fast, drilling fluid cuttings into the drilling tool, or due to the collapse of the well wall, serious back, cuttings into the drilling tool, blocking the drill bit water hole;

(3) The wall mud cake is thick, there are a lot of rock debris adhered to, and the drill bit is squeezed into the water hole when drilling;

(4) freezing of ground pipelines or drilling tools in winter;

(5) The drill filter is blocked by dirt;

(6) the wall mud cake is thick or the wall collapses, the annulus is not smooth, and the drilling fluid cannot return up;

(7) During drilling, there is hard pressure or multiple columns do not return drilling fluid, and the drill bit is pressed into the cuttings, resulting in the opening of the pump;

Treatment: If the pump is not opened, it is necessary to eliminate the ground factors first, and then deal with the downhole blockage. If the drill hole is blocked, the drilling tool can be greatly moved and the water hole can be opened using excited pressure. If the annulus is blocked, the drill tool should be moved up and down to dreg the annulus, and then the pump should be slowly opened with a small displacement. If the annulus is not effective, the drill should be started to open the pump again in the open well section, and then the bottom drilling. If it is found that the formation is leaking, drilling should be started immediately, and the pump should not be opened in the middle to prevent the formation from collapsing and causing stuckdrilling.

13.What is the reason for the increase in pumping pressure in drilling? How to deal with it?

The reasons are: well collapse, drilling tool water hole blockage, a large number of rock debris piled up in small holes, drilling fluid performance changes, scraper bit bald or blade off, drilling fluid density is not uniform.

Treatment method: If the well collapse should be large circulation drilling fluid, repeated drilling, carrying out the lost block, light pressure drilling to restore normal. If the drill pipe cuttings accumulation should be eliminated by turning or moving the drill pipe up and down. If the pump pressure continues to rise, the pumping drill can be stopped, and the accumulation will be broken up and then the pump out. If the drilling fluid performance deteriorates, the drilling should be stopped. If the density is not uniform, add barite in sections or circulate one pump and mix one pump at low pressure to make it uniform.

14.What is the reason for the drop in pumping pressure in drilling? How to check? How to deal with it?

Pump pressure drop causes, pump water is not good, pipeline or gate leakage, drilling tool puncture caused short circuit circulation, drill hole puncture or off the nozzle, broken drilling tool, leakage, drilling fluid gas invasion bubble and so on.

Inspection method: First check the ground, pump working condition, pipeline. Whether the gate is punctured or short-circuited circulation, whether the pressure gauge is accurate, and then consider whether the downhole drilling tool is punctured or broken, whether the nozzle is punctured or fallen off, and whether there is leakage.

Treatment method: Emergency repair should be organized for ground reasons, and drilling fluid treatment defoaming. After the drilling tool or nozzle is punctured, start drilling immediately, check the drilling tool in detail, do not use the turntable shackle during drilling, do not brake hard to prevent the drilling tool from tripping and breaking. In case of loss, drilling fluid should be continuously pumped out immediately.

15.Drilling rotary plate load increase, remove the rotary plate clutch down the car is why? How to deal with it?

Reasons:

(1) formation collapse debris collapse (such as drilling to faults, cracks, formation fracture zone, etc.);

(2) Dry drill or mud pack;

(3) the bit cone is stuck or the scraper fragment;

(4) downhole falling objects;

(5) Short circuit cycle, cuttings can not come out;

(6) The trajectory of the directional well is not good, the well inclination is large, the displacement is large, and the dog leg is severe;

Treatment method: First determine whether the drill bit is normal, if dry drilling, to lift the drill tool repeatedly reaming lifted, in addition, with light turn to judge the drill bit, if the short circuit cycle should immediately start drilling to check the drill tool. According to formation prediction, adjacent well data, and returned cuttings, the location and extent of well collapse are analyzed, and effective measures are taken to eliminate and prevent stuck drilling. If the problem of well trajectory is solved, the drilling tool can be simplified and the torque can be reduced.

16. What is the reason for the jump found in drilling? How to deal with it?

Skip drilling occurs in the cone bit drilling, the reasons are:

(1) Drilling encountered gravel layer soft and hard interlayers, uneven texture limestone strata;

(2) well collapse or downhole falling objects;

(3) Excessive torque when using a big tooth drill;

Treatment method: Adjust the parameters to exclude drilling skip, and make a comprehensive judgment according to the formation lithology, if the treatment is ineffective, should consider the downhole object, drilling to check the wear of the bit, should take effective measures, in the process to prevent stuck drilling.

17. What is the cause of the bit bouncing? How to deal with it?

(1) The scraper bit meets the soft and hard surface of the formation;

(2) the bit weight of the scraper is too large or drilling;

(3) drilling gravel layer or limestone cave;

(4) Formation blocks or falling objects in the well;

(5) cone bit mud or cone stuck;

(6) Drop the cone or scraper blade;

(7) The diameter of the scraper bit is smaller than the diameter of the stabilizer after grinding;

Treatment: If the formation cause can be adjusted to eliminate the weight on bit speed, if ineffective, it may be caused by the bit or falling object, should be drilling inspection to determine the next step.

18, drilling in the transmission chain broken should be how to deal with?

(1) First, the cycle must be maintained;

(2)When the well is shallow, use the manpower to turn the kelly or use the gas hoist to pull the turntable chain to move the drill;

(3)When the well is deep, part or all of the weight of the drill tool is pressed down, resulting in bending of the drill tool and reducing the chance of sticking;

(4) Quickly organize personnel to grab the chain, and then lift the drill tool to check the normal parts after resuming drilling;

19. What is the reason why the hose is entangled with the kelly pipe when drilling? How to deal with it?

The reason is that the swivel bearing has problems (bad, lack of butter, etc.) the flushing tube disc is too tight, the kelly is bent and the turntable is fierce, the faucet anti-twist rope is not bolted according to the regulations, and the big hook is not locked. After the hose is wrapped around the kelly, the kelly can be pulled by lifting pliers, and the faucet or kelly can be removed if it is seriously entangled; If the flushing pipe is too tight and lightly wrapped around the kelly pipe, the rope clamp can be used to fix the faucet and turn slowly for a period of time.

20. What is the reason for the drop in the hanging weight of the middle finger? How to deal with it?

The reason is that the weight gauge is bad or the drill pipe is broken.

The treatment method: first lift the drill pipe to check the weight gauge sensor, whether the pressure transmission pipeline and the table or the joint are leaking oil, whether the parts are damaged, and then re-calibrate the weight gauge. If the weight table is intact, immediately start drilling to check the drill tool, and decide the treatment method according to the situation.