#SLIP ONE PAST THE GUNK HOW TO#

The first stage is easy to describe, but the others are described by different theories.

Jarring process is usually treated as three stages: storing up strain energy by tensioning string, converting strain energy to kinetic energy after triggering, and transmitting dynamic force and impulse to stuck point after impact. The reasons of large coefficient span mainly come from two aspects: dimensions of working string and theories used in discussion. Prior studies on jars indicate that the amplification coefficient of maximum dynamic force to jar triggering force ranges from 2 to 10, and the coefficient is regarded as an important parameter for evaluating jar efficiency (Sun and Huang, 1997 He and Chen, 1999 Huang, Chi, Tang, Lv and Xue, 2010). Jarring is one of the practical methods in oil fields (Skeem, Friedman and Walker, 1979 Zhang, Li and Wang, 2004).

#SLIP ONE PAST THE GUNK HOW TO#

INTRODUCTION A lot of researches have been made on how to free stuck strings during oil well drilling and workover operations, but there is no report on releasing stuck packer during well testing. Moreover, axial forces in tubing string and slip joint during jarring operation are investigated, and advices are proposed to ensure the testing string security. Influence of collar length, jar stroke length and triggering force on unstuck force and impulse delivered to the packer are calculated. Therefore the whole string is treated as a continuous elastic medium. From string axial force and stress wave analysis, it is found that the slip joint does not interrupt testing string mechanical behavior during jarring.

Completion Installation and OperationsВ (2)ДЄBSTRACT Based on the stress wave propagation theory, testing string dynamic behavior during jarring operation is studied.

Slip one past the gunk