| Abstract |
San Jacinto Tizate is a high temperature geothermal field with a total of 24 original legs, 6 sidetracks, and 4 forks wells or multilateral wells (3 production wells and 1 reinjection well). One of them that show cycling behavior is SJ9-3 fork leg. SJ9-3 is a production well drilled in August 2010 at 1,676 mMD. After drilling the well, was identified formation damage due to the amount of mud, and to remove this damage and enhance permeability was performed an acid treatment in July 2011. During the build up test, the slickline was broke inside the lubricator tube and the Kuster K10 tool plus two heavy sinker bars and 5500 feet of slickline fall into the well. The well was put into production without any interference from all the parts left inside the well, but from March to September 2012 was observed a production declined. In 2013, an enhancement program was carried out with the objectives of recover the slickline and Kuster tool, deepen the well, perforate blank section 9-5/8†liner and 13-3/8†production casing, and fork the well to find additional permeability and increase production capacity. SJ9-3 fork leg was put online again in March 2014. Since it was connected to the power plant, a cycling production behavior was observed, maybe due to some competition between both legs to dominate the production which it is affected by the enthalpy’s differences of each feed zone fluids. The original leg behavior showed distant cycles that allowed more stable production, and after remediation program the well showed greater cycles which caused instability in its production. Based on unstable production behavior, PTS logs were a useful tool to identify permeable zones, what leg produced, the percentage of contribution and to understand this cycling behavior. Currently, the well continue showing production cyclic behavior between 33 and 72 tph of total mass flow, with an average enthalpy of 1,995.4 KJ/Kg and 63.38% of quality. The average power generation is 3.73 MW. |