With Vinyl Opening Ball sheared and the port closed, keep pumping and lift the tool above the table to visually check the port is closed. Stop the pumps, pick up string and place in the slips, break the tool between the circulating sub main body and the ball catcher sub. Remove Kelly and back out the circulating sub from the string and retrieve the balls from the ball catcher.
Do not under any circumstances re-use the vinyl opening balls once they have been used in the tool. Record pump pressure and strokes prior to dropping the Vinyl Activation opening ball. This will be referred to upon de-activation of the tool to confirm that the tool has closed. Stop the pumps and place string in the slips.
Break the string at floor level and drop the 1" vinyl activation opening ball into the string. Ensure that the pipe screen has been removed. This will ensure that the vinyl ball is landed gently and not allowed to blow straight through the tool. If this should occur, drop the steel deactivation closing balls and recycle the tool. When the vinyl activation ball engages the seat, an initial rise in pressure will be seen at the surface, followed by a significant pressure loss, as the inner mandrel will have moved down to its open position and the fluid diverted through the side ports.
Increase the pump strokes and circulate the desired fluid volume keeping a constant pump rate for the PBL Sub. This is not necessary when the locking ball has been used. There is a chance, when pumping LCM, the ports can become choked and therefore the pressure can, very quickly, reach the shearing pressure of the opening ball.
Stop pumps and place string in the slips. Make up the string and engage pumps and pump at normal flow rate. When the steel balls engage the two open port orifices, the pressure will rise quickly.
It is preferred to take the pressure quickly to the shearing pressure; this will reduce the washing effect of the drilling fluid on the ball and port. The shear pressure down hole may be lower than on surface as down-hole conditions can have an effect on the tool. When the 1" Vinyl Activation ball is sheared through the ball seat of the PBL Sub, the piston will move up, closing the circulating port, and allowing the two Steel Closing Balls to fall into the Ball Catcher.
Circulation will now be through the bottom-hole assembly to bit. Check the pre-recorded pump pressure and strokes to see if they are the same as before the Ball Locking PBL Sub was activated, if the fluid weight in the hole is the same. The string can be circulated whilst the ball is dropping down the string.
Do not pump too fast when nearing the orifice of the PBL Tool or the ball may shear straight through the ports. When the pressure rises this will indicate that the ball is lodged in the port orifice and the pumps may now be switched off. When pumping slugs etc. When on surface the PBL tool can be racked back vertically in the locked open position with the drilling stand if it is to be re-run back in the hole to fill pipe etc.
However if the PBL tool is laid down in the interim, it is recommended re-setting the tool to the closed position as a precaution. This will eliminate the possibility of the vinyl activation ball inadvertently dislodging from tool, which could be over looked when picking up the tool again to RIH.
When the Locking Ball has been sheared through the port orifice, the second Steel De-Activation Closing Ball will take its place in the port.
Continue pumping and raise pressure to the Shear Pressure required. When the 1" Vinyl Activation opening ball is sheared through the ball seat of the PBL Sub, the piston will move up, closing the circulating ports, allowing the two Steel Closing Balls to fall into the Ball Catcher following behind the vinyl ball.
Circulation will now be through the bottom-hole assembly. The same procedure is used on surface to re-set and close the PBL. This operation should be done with the PBL tool below the rotary table. Surface function test; when tool is placed in the BHA, drop 2" Vinyl Activation opening ball in the top of the tool and allow to sit in the ball seat. Break the string at floor level and drop the 2" vinyl activation opening ball into the string. When the 2" Vinyl Activation ball is sheared through the ball seat of the PBL Sub, the piston will move up, closing the circulating port, and allowing the two Steel Closing Balls to fall into the Ball Catcher.
When the 2" Vinyl Activation opening ball is sheared through the ball seat of the PBL Sub, the piston will move up, closing the circulating ports, allowing the two Steel Closing Balls to fall into the Ball Catcher following behind the vinyl ball.
This can cause the pressure to rise and blow the ball through the ball seat prematurely, therefore closing the tool. Open navigation menu. Close suggestions Search Search. User Settings. Skip carousel. Carousel Previous. Carousel Next. What is Scribd? PBL Operation Procedure.
Uploaded by kudturkar. Did you find this document useful? Is this content inappropriate? Report this Document. Flag for inappropriate content. Download now. Related titles. Carousel Previous Carousel Next. Jump to Page. Search inside document. When tool function confirmed, stop pumps PBL piston will close , set tool in slips, break Kelly and drop steel deactivating closing ball s into tool on top of vinyl activation ball. Without Locking Ball 1.
This can cause the pressure to rise and blow the ball through the ball seat prematurely, therefore closing the tool 3. Evence Chen. Ferry Andri. Tran Dang Sang. Adil Aytekin. Hao Xu. Dozie Kesieme. Jeff Formica. Abhijeet Feelproud. Mufti Ghazali. Sanjay Mishra.
Christian Olascoaga Mori. Markus Landington. Zaid Prokik. Popular in Science And Technology. Lanin a. Young Jae Kim. Andreea Busecan. Joshua Sanchez. Nanda Auliana. Bindu Chipiri. Li Du. Bit ApplicationThis Varel Drilling Equipment. Varel Bits. Neo-Oil Tools. Redback Drilling Tools. Casing Technology. Down Hole Products. Deep Casing Tools. Leader in Down-Hole Circulation Technology. Neo-Oil Tools NeoTork is a downhole tool that manages torque generated as well as mitigating axial and torsional vibrations,
0コメント