Drilling the reservoir section in the Sagari field (Peru) presents many challenges, such as wellbore collapsing in the extremely mechanically unstable Shinai formation; differential sticking in low-pressure, high-permeability sandstone reservoirs; and total losses due to the presence of natural fractures. This paper describes how the implementation of automated managed pressure drilling (MPD) and managed pressure cementing (MPC) techniques allowed overcoming those challenges in a remote location where logistics and equipment mobilization is an additional challenge.
The preliminary geomechanical study indicated that an equivalent density (ED) of 10.5-lbm/gal was required to maintain wellbore stability, while 10.8-lbm/gal could not be exceeded due to the risk of differential sticking. Additionally, eliminating pressure variations in the mechanically unstable Shinai formation would prevent wellbore collapse. The MPD strategy for drilling the original 8.5-in hole section and sidetrack consisted in using an automated MPD System to maintain the ED profile within the 10.5 to 10.7-lbm/gal window along the open hole and a near-constant pressure of 10.5-lbm/gal in the most unstable Shinai formation at all times.
Due to its reduced footprint, this automated MPD equipment package could easily be airlifted by helicopter to the remote rigsite.
The MPD strategy was implemented as per plan; it successfully prevented wellbore instability and differential sticking and contributed to the excellent condition of the wellbore. Indeed, the production liner was run down the 2,700ft of open hole smoothly in less than six hours and later well testing revealed that the mechanical skin factor in the reservoir section was equal to zero.
When drilling the last feet of the sidetrack with an ED of 10.5-lbm/gal, a natural fracture was encountered; it was immediately detected by the MPD Coriolis flow meter located at the well returns, allowing for a quick response and curing losses rapidly. However, this further reduced the operating window size. MPC allowed using a statically underbalanced drilling fluid, while ensuring well integrity and preventing wellbore collapsing during cement placement. The estimated ED on bottom was monitored in real-time and losses were successfully prevented. The coupling of the wiper plug on the landing collar was observed as per plan, and successful zonal isolation was later confirmed by cement bond log (CBL) and casing integrity test (CIT).
In addition to the application of managed pressure techniques in the production section, MPC of the intermediate 9 5/8-in casing was performed as a contingency measure, as the reduced annular flow area between the two casing strings and the narrow pore pressure -fracture pressure window would not allow cementing the casing conventionally.
The objective of this study is to evaluate the quality of service of delivery applications, in order to have knowledge of which factors are most important for consumers when making their online purchase process and how much influence these factors have on the purchase process. consumer loyalty. Therefore, a quantitative study was carried out through a survey that uses several measurement models such as ESQUAL. This survey was applied online to 319 residents of the city of Guayaquil who use delivery applications. In th e analysis of the results, the data was divided into three groups: "General", "Uber Eats" and "Other apps", to evaluate the behavior of the variables of each group by estimating a Structural Equation Model. Among the main results, it is highlighted that the variables Guarantee, Personalization, Relationship with the brand and Traceability have a positive and significant effect on the loyalty of users of delivery apps and that "Uber Ea t s"is the market leader despite that its users consider that the shipping cost is somewhat high.
In this investigation, we sought to solve a problem that concerns a large part of the recycling companies in the world, which consists of the lack of procedures for the control and management of inventories; this problem has caused Ecorexcicle S.A.S. an hourly overload in the export process generating an economic loss due to overtime payment and a possible loss of clients due to delays in the delivery of containers. To solve this problem, it was decided to implement a procedure manual for inventory management and control through the 5s quality methodology, which, together with the integration of the components of the COSO II methodology, was optimized by 72 % the loading time of the containers and the release of 124 square meters of the main warehouse.
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