Abstract
The multistage stimulation technology of horizontal wells has brought huge benefits to the development of oil and gas fields. However, the completion string with packers often encounters stuck due to the large drag in the horizontal section, causing huge economic losses. The local drag of the completion string with packers in the horizontal section is very complicated, and it has not been fully understood by theoretical calculations. A local drag experiment is designed to simulate the influence of microsteps and cuttings on the local drag of the completion string with packers in the inclined and horizontal sections. An obvious increase of the local drag of the packer is found at microsteps of the horizontal section, and the local drag is greatly affected by the amount of sand. In addition, the string with packers will vibrate during the tripping process in the deviated section, and the local drag is different when different amounts of sand are in the hole, but the change law is similar. The experimental results show that the friction coefficients of the packers with different materials in the horizontal section vary greatly, resulting in different local drags. It indicates that the local drag of the completion string not only depends on the microsteps and sand quantity in the wellbore, but also on the material difference of the packers. Only if microsteps and cuttings are removed can the completion string be tripped into horizontal wells smoothly.
Highlights
The horizontal well technology has been maturely applied in the development of oil and gas fields, and the extension record of horizontal wells has been continuously updated with the development requirement and technological advancement [1,2,3]
A local drag experiment is designed to simulate the influence of microsteps and cuttings on the local drag of the completion string with packers in the inclined and horizontal sections
An obvious increase of the local drag of the packer is found at microsteps of the horizontal section
Summary
The horizontal well technology has been maturely applied in the development of oil and gas fields, and the extension record of horizontal wells has been continuously updated with the development requirement and technological advancement [1,2,3]. With the advancement of the completion technology, more and more horizontal sections of horizontal wells are not cemented and stimulated to increase production [14]. There are many kinds of fracturing technology, and the acidizing fracturing is the most effective one to bring the best stimulation results in many oil and gas fields [19,20,21]. The completion string with packers (as shown in Figure 1) frequently gets stuck in the horizontal section and fails to run into the bottom of the horizontal wells due to high drags, and the sticking
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
