This case history paper presents the first multistage fracture stimulation of a mature field well in Ecuador using a hydraulic workover unit deploying jointed pipe. The process used a hydrajet perforating application followed by tubing-path pumping of the fracturing treatments. To place fractures properly in each pay zone, effective diversion is required. This has been a challenge in many fields of Ecuador. Furthermore, multistage fracturing completions have represented a complex process when applying conventional methods because of the number of operations involved, such as perforating, fracturing, setting isolation plugs, and cleaning out the wellbore for each interval. Several trips into the well are often required, which adds time and costs to the entire completion intervention. Because of the absence of some information as well as the presence of upper open perforated intervals, the hydrajet assisted fracturing (HJAF) process, which uses highly effective abrasive jet perforating immediately before the fracturing stage, was used to provide a degree of flexibility for making additional decisions and performing changes during the operation. This paper presents the detailed workover planning, multiple customized fracturing designs, operations data, and the stimulation results of the case study. The multistage hydraulic fracturing technique was designed and applied to individually fracture stimulate three formation layers in the Ecuador mature field. The method allowed using customized treatments for each zone and more aggressive fracturing schedules to promote high fracture conductivity or length when necessary. Successful production from the mature Ecuadorian field was achieved using the multistage hydraulic fracturing HJAF method. Additionally, this method does not require mechanical zonal isolation between stages. The HJAF technique provides an attractive option for applications in similar wells to help recover additional reserves.
Jujo Teco is one of the most important oil fields located in southern Mexico. It produces an average oil gravity of 35 API, which is combined with the heavy oil from offshore Mexico to enrich the Mexican oil blend. Sustaining oil production rates is one of the main targets for this mature field, and controlling the water produced is one of the primary challenges to keep the oil production up to the desired levels. Performing conformance treatments in this field is also a major challenge. Formations to be treated are naturally fractured carbonates averaging depths of 19,000 ft with bottomhole temperatures above 300°F. They are completed in openhole sections with typically 300 ft of exposed formation. It is especially difficult to address if the water-control treatments are bullheaded because there is no way to distribute and place the fluids in the right zone without the risk of sealing off the oil producing sections. Using coiled tubing for placing these types of treatments has been a viable alternative to increase the rate of success on these deep, openhole completions in conjunction with the introduction of a high-temperature conformance polymer. The cases presented in this paper show how the water cut has remained almost zero in some instances, even when the treatment was performed three years ago.
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