In the current cost-constrained oil field environment, operators must complete their wells while minimizing capital expenditure. Operators respond to these challenges by utilizing customized diagnostic services and specialized tools in a single run to save on rig costs. Coiled Tubing (CT) deployed fiber- optics assist in taking Distributed Temperature Sensing (DTS) during acid stimulations to estimate fluid volume distribution in the horizontal openhole with a specialized jetting tool to create wormholes and complex microfractures.

This paper discusses an acid stimulation process using dynamic fluid energy to divert flow into a specific sweet spot in the well to initiate and accurately pinpoint acid stimulation. The treatment efficiency was monitored and visualized in Real Time (RT) with CT-conveyed fiber-optic DTS. This acid stimulation process, named Integrated Dynamic Diversion (IDD), often uses two independent fluid streams: the acid phase down the treating string and other liquids or foamed fluid down the annulus. Two different fluids mix downhole with high energy to form a homogenous mixture.

Pre-job DTS injection profile diagnostics identified a non-permeable zone, and the stimulation pumping schedule was adjusted accordingly. Using the IDD process, this was done in RT by changing the depths and increasing the number of stages across the non-permeable zone. Post-job injection profile DTS diagnostics confirmed an increase in injectivity across the non-permeable zone with a uniform injection across the entire openhole. This proved the value of combining RT CT with IDD using a dual pumping process and the specialized jetting tool. Post-job production results also indicate a sustainable production with an oil gain of +500 BOPD.

Applying the IDD methodology with DTS services is the most appropriate solution to address the unique challenges of openhole operations, formation technical difficulties, high-stakes economics, and untapped high potential from intermittent reservoirs. This paper presents post-job results obtained from stimulating multiple zones along the lateral and describes the lessons learned in implementing this methodology, which can now be considered best practice for applications with similar challenges in other fields.

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