Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Halliburton Energy Services IncfiledCriticalHalliburton Energy Services Inc
Priority to MYPI2015702011ApriorityCriticalpatent/MY174051A/en
Priority claimed from PCT/US2012/072102external-prioritypatent/WO2014105054A1/en
Publication of MY174051ApublicationCriticalpatent/MY174051A/en
A method of mitigating undesired pressure variations in a wellbore (14) due to movement of a well tool string (12) in a well can include selectively decreasing and increasing fluid communication between sections (30a, 30b, 36) of a wellbore on opposite sides of at least one well tool (16, 18, 20, 22, 24, 26, 38, 40, 66, 68) in the well tool string, the fluid communication being increased in response to detecting a threshold movement of the well tool string relative to the wellbore. A well tool string can include a well tool connected in the well tool string, and having an enlarged outer dimension relative to adjacent sections (42, 44) of the well tool string, a flow passage (48, 62) extending between the well tool's opposite ends, a sensor (58), and at least one flow control device which selectively permits and prevents fluid communication between the opposite ends via the flow passage, in response to an output of the sensor indicative of movement of the well tool string. FIGURE 1
MYPI2015702011A2012-12-282012-12-28Mitigating swab and surge piston effects in wellbores
MY174051A
(en)
method for characterizing an underground formation using a fluid pressure response during well drilling operations, and method for calculating fluid flow flowing from a well, based on a fluid pressure response during well drilling operations
downhole tool to perform a downhole operation, downhole tool to perform an operation inside a drilled well and method to control fluid flow through a downhole tool