CBHP Kill Methods 2 CBHP Kill Methods 1 / 40 What is the proper procedure to check for trapped pressure after killing a well? Open the choke and bleed all pressures to zero Open the choke to bleed off a small amount of volume through the choke and close it again. If the well is underbalanced, the pressures will increase. Open the BOP and flow check the well through the mud gas separator Increase the mud weight by 1.0 ppg to ensure the well is killed 2 / 40 How can you maintain Bottom Hole Pressure (BHP) constant while pumping kill fluid down the string on the 2nd circulation of the Driller’s Method if there is still an influx in the annulus? Follow the pipe pressure schedule Bleed off any trapped pressure to increase your BHP above Formation Pressure Keep your casing pressure constant Pump kill fluid down the pipe as fast as possible to maximize your Equivalent Circulating Density (ECD) 3 / 40 Use the information below to answer the following question: Well is shut-in while drilling. SIDPP = 400 psi SICP = 800 psi MW = 10 ppg Kick Density = 8.6 ppg Well Depth = 9000 ft TVD / 11000 ft MD If the Driller’s Method is used to circulate out this salt-water kick, what would happen to the casing pressure as the kick moves up throught the annulus? Casing pressure would remain the same Casing pressure would change as the annulus size changes Casing pressure would increase until the kick is out Casing pressure would decrease as the water kick is not expanding 4 / 40 What surface pressure should be kept constant on a surface stack rig while bringing the pump online at the beginning of the kill operation? Shut In Drill Pipe Pressure (SIDPP) Shut In Casing Pressure (SICP) Shut In Drill Pipe Pressure (SIDPP) plus the Slow Pump Pressure (SPP) Final Circulating Pressure (FCP) 5 / 40 While circulating out a gas kick using the first circulation of the Driller’s Method, what happens to casing shoe pressure while the gas is still in the open hole if the proper kill procedure is followed? Casing shoe pressure would increase Casing shoe pressure woud decrease Casing shoe pressure would stay the same There is no way to know 6 / 40 While circulating out a gas kick using the first circulation of the Driller’s Method, what happens to casing shoe pressure once the gas bublle is in the casing if the proper kill procedure is followed? Casing shoe pressure would increase Casing shoe pressure woud decrease Casing shoe pressure would stay the same There is no way to know 7 / 40 What would happen to the Bottom Hole Pressure (BHP) if a vertical pipe pressure schedule is used while pumping kill fluid down the pipe in the Wait and Weight Method? BHP would be higher once too much pressure would be applied against the well BHP would stay the same and balanced against formation pressure BHP would be lower once too little pressure would be applied against the well There is no way to know 8 / 40 What happens to the Bottom Hole Pressure (BHP) if the drill pipe pressure (DPP) is held constant while increasing the pump rate during a kill operation? BHP would increase BHP would decrease BHP would stay the same There is no way to know 9 / 40 What happens to the Bottom Hole Pressure (BHP) if the pipe pressure (DPP) is held constant while reducing the pump rate during a kill operation? BHP would increase BHP would decrease BHP would stay the same There is no way to know 10 / 40 After a successful first circulation of the Driller’s Method, what pressure shoud be kept constant while pumping kill fluid down thestring? Pipe Pressure Casing Pressure Pump Pressure Pipe Pressure plus a safety margin 11 / 40 As a gas kick is circulated out, what would happen to the pit level? Increase Decrease Stay the Same It would increase once the gas is coming out of the choke 12 / 40 As a gas kick is circulated out using the first circulation of the Driller’s Method, what would happen to the pit level? It would increase once the gas is expanding and then decrease as the gas vents out the choke It would stay the same throught the circulation It would increase once the gas is expanding and then stay the same once the well is clean It would decrease once the gas is expanding and then increasing as the gas reaches the surface 13 / 40 If the Final Circulating Pressure (FCP) is held constant on the drill pipe pressure gauge as kill fluid is pumped up the annulus, what would happen to the Bottom Hole Pressure (BHP)? BHP would increase BHP would decrease BHP would stay the same There is no way to know 14 / 40 Analyze the following scenario to answer the question. Well is shut-in on a gas kick. Gas is migrating and casing shoe pressure is increasing. There is not enough barite available on the rig. Which kill method should be used? Driller's Method Wait and Weight Method Lubricate and Bleed Method Volumetric Method 15 / 40 After the first circulation of the Driller’s Method, the pump has been shut down. The Casing Pressure (CP) is 450 psi higher than the Shut-In Drill Pipe Pressure (SIDPP). What is the best course of action? Pump kill fluid down the pipe while holding CP constant Pump kill fluid down the pipe while holding DPP constant Resume circulation and circulate a bottoms-up Everything looks good, prepare to open the well and bleed off any trapeed presssure 16 / 40 If the Driller’s Method is used to circulate out a salt-water kick, use the information below to asnwer the following question: SIDPP = 200 psi SICP = 500 psi Mud Weight = 8.0 ppg Influx density = 8.6 ppg When will casing pressure (CP) reach its minimum value? When the influx reaches its maximum height in the annulus When the influx reaches its minimum height in the annulus When the influx reaches the shoe There is no way to know 17 / 40 With kill fluid pumped to the bit during the Wait & Weight (W&W) Method, the pump was shut down with no trapped pressure and the pressure gauges read: Drill Pipe Pressure = 125 psi Casing Pressure = 800 psi What is the status of the well? The well is dead, bleed off any trapped pressure and resume drilling Everything looks good, resume pumping to get kill fluid to the surface Verify if the kill fluid density is correct and the surface to bit strokes were pumped There is 800 psi of trapped pressure in the well, open the choke to avoid shoe fracture 18 / 40 While killing a well using the Wait & Weight Method, how should be Bottom Hole Pressure (BHP) be kept constant with kill fluid in the annulus? Hold the drill pipe pressure (DPP) constant at Final Circulating Pressure (FCP) Follow the drill pipe pressure schedule Hold casing pressure (CP) constant Hold the drill pipe pressure (DPP) constant at Initial Circulating Pressure (ICP) 19 / 40 A gas kick is being circulated along the horizontal section of the hole. What will happen to the active pit volume if the proper procedure is followed? Increase as the mud is expanding Increase as the gas kick is expanding Decrease as mud replaces the gas in the horizontal section Remain approximately the same 20 / 40 Under which circumstance would the Wait & Weight Method provide lower casing shoe pressure than the Driller’s Method? The casing shoe pressure are the same on both methods When the drill string volume is less than the open hole volume When the drill string volume is greater than the open hole volume When the open hole volume is less than the drill string volume 21 / 40 What is the main objective of the Wait & Weight Method? Displace both legs of the well with kill fluid in two circulations Displace both legs of the well with kill fluid in one circulation Remove the kick using the original mud weight To circulate the well as soon as possible before gas migration happens 22 / 40 Why should you leave spare capacity in the active pits when circulating out a kick? To store the formation fluid as it is circulated out of the hole To compensate for any possible losses while killing the well If the kick is a gas, it will expand and the pit level will increase If the kick is a oil, it will expand and the pit level will increase 23 / 40 The decision is made to hold the casing pressure (CP) constant while displace the string with kill fluid during the 2nd circulation of the Driller’s Method. Why is it important that the first circulation was successful? Any gas left in the annulus will increase the Bottom Hole Pressure (BHP) if CP is held constant Any gas left in the annulus will decrease the BHP once the gas will expand It is not important if there is gas left in the well Any water ledt in the well decrease the BHP once the kick will expand 24 / 40 How is Bottom Hole Pressure (BHP) kept constant while displacing the drill string with kill fluid during the Wait & Weight Method? Hold the Drill Pipe Pressure (DPP) constant at Initial Circulating Pressure (ICP) Hold the Drill Pipe Pressure (DPP) constant at Final Circulating Pressure (FCP) Follow the DPP schedule Hold Casing Pressure (CP) constant 25 / 40 How is Bottom Hole Pressure (BHP) kept constant while pumping kill fluid down the drill string during the Wait & Weight (W&W) Method? Follow the drill pipe pressure schedule Hold casing pressure constant Hold the drill pipe pressure constant Hold the pump pressure constant 26 / 40 How is Bottom Hole Pressure (BHP) kept constant while pumping kill fluid up the annulus during the Wait & Weight (W&W) Method? Follow the drill pipe pressure schedule Hold casing pressure constant Hold the drill pipe pressure constant at FCP Follow the casing pressure schedule 27 / 40 How is Bottom Hole Pressure (BHP) kept constant while circulating the kick out during the first circulation of the Driller’s Method? Follow the drill pipe pressure schedule Hold casing pressure constant Hold the drill pipe pressure constant at ICP Follow the casing pressure schedule 28 / 40 How is Bottom Hole Pressure (BHP) kept constant while pumping kill fluid down the drill string during the second circulation of the Driller’s Method? Follow the drill pipe pressure schedule Follow the casing pressure schedule Hold the drill pipe pressure constant Hold the pump pressure constant 29 / 40 How is Bottom Hole Pressure (BHP) kept constant while pumping kill fluid up the annulus during the second circulation of the Driller’s Method? Follow the drill pipe pressure schedule Hold casing pressure constant Hold the drill pipe pressure constant at FCP Follow the casing pressure schedule 30 / 40 How is Bottom Hole Pressure (BHP) kept constant while pumping kill fluid down the drill string during the second circulation of the Driller’s Method? Hold casing pressure constant Follow the casing pressure schedule Hold the drill pipe pressure constant Hold the pump pressure constant 31 / 40 What pressure should be controlled and kept constant while killing a well? Casing pressure Bottom hole pressure Drill pipe pressure while pumping kill fluid to the bit Drill pipe at the initial SIDPP 32 / 40 If the BHP is held constant during the first circulation of the Driller’s Method, what happens to the casing shoe pressure once all the gas is inside the casing? Casing shoe pressure will increase Casing shoe pressure will decrease Casing shoe pressure will stay the same There is no way to know 33 / 40 Compared to the vertical section of the well, a gas kick being circulated through the horizontal section of the well will expand: More There is no way to know The same Less 34 / 40 What will happen to the casing pressure when a gas kick is circulated from the horizontal section into the vertical section of the well? Casing pressure will increase Casing pressure will decrease Casing pressure will stay the same There is no way to know 35 / 40 After the first circulation of the Driller’s Method, what should be done if the casing pressure is still 400 psi greater than the string? Nothing, casing pressure is higher than the drill pipe because the well has not benn killed yet Resume circulation until the kick is out Bleed off casing pressure, that is just trapped pressure Open the well and resume drilling 36 / 40 Calculate the formation gradient with the surface pressure from the following information: Fluid weight = 6.5 ppg / SP = 250 psi / TVD = 6,000 ft / MD = 6,500 ft 0.38 psi/ft 0.41 psi/ft 0.052 psi/ft 0.58 psi/ft 37 / 40 You are displacing a tapered string with kill fluid. Which of the following should NOT change as pipe is displaced with kill mud? Bottom hole pressure Pressure drop per step Drill pipe pressure Strokes Counter 38 / 40 A well is killed with the Wait & Weight (W&W) method. At what point of the kill operation the drill pipe pressure should be held constant at the Final Circulating Pressure (FCP)? When kill fluid returns to the surface Once kill fluid has reached the bit Once the kick is out On the second circulation of the W&W method 39 / 40 A kicks was taken and, while waiting for barite, the surface pressures started to increase after stabilization. What should be done? Bleed off mud holding casing pressure constant There is nothing that can be done Use the first circulation of the Driller's Method Use the Wait & Weight method to kill the well 40 / 40 On a surface stack rig, what surface pressure should be kept constant during the pump start-up? Drill pipe pressure Slow circulating pressure Casing pressure Maximum allowable casing pressure Your score is LinkedIn Facebook Twitter VKontakte
