Tangible Values for Running Distributed Temperature Survey (DTS) as Part of Stimulating Multi-Lateral Injection Wells

Al-Gamber, Salman Dawood; Mehmood, Sajid; Ahmed, Danish; Burov, Anton; Brown, George; Barkat, Souhaibe; Shrake, Gwynne

doi:10.2118/167490-ms

Day 3 Wed, October 30, 2013 2013

DOI: 10.2118/167490-ms

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Tangible Values for Running Distributed Temperature Survey (DTS) as Part of Stimulating Multi-Lateral Injection Wells

Salman Dawood Al-Gamber

Sajid Mehmood

Danish Ahmed

et al.

Abstract: Proven to maximize hydrocarbon production or well injectivity, horizontal multilateral completions have witnessed growth both in number and complexity over the years. These well types brought challenges with respect to well accessibility for rigless well intervention, and the ability to access these wells has been developed using coiled tubing (CT) to enable operations, such as reservoir stimulation, to be carried out. One of the main challenges is to identify and access each lateral, to be able… Show more

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Cited by 7 publications

References 2 publications

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Setting a New Milestone in Carbonate Matrix Stimulation with Coiled Tubing

Al-Hajri

AL-Ghamdi

Al-Subaie

et al. 2015

SPE Middle East Oil &Amp; Gas Show and Conference

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Horizontal carbonate reservoir stimulation has attracted considerable attention in the past decade as one of the major areas for development in matrix stimulation engineering. Modern technologies have enabled technically suitable interventions in extended and even mega-reach wells. In the Middle East especially, carbonate field development strategies have used mega-reach wells as the main technique in achieving the highest possible reservoir contact. In such a case, coiled tubing (CT) intervention becomes a necessity.With carbonate acidizing, since more than 50% of the matrix is soluble in acid, the objective is to bypass the damage and increase the productivity by creating new highly conductive channels called wormholes. The success of a treatment is a function of fluid penetration, acid reactivity, injection rate and diversion. To increase the success of the treatments, improvements have been made recently in injection rate and diversion using the latest technologies in CT intervention. The introduction of CT provides significant advantages in stimulation execution, yet imposes some challenges. Real-time downhole measurements using fiber optic telemetry have been used frequently to improve chemical diversion and fluid placement. However, pumping rates have been significantly limited to a maximum of 2.0 bbl/min when this technology is deployed.Extensive engineering work was invested in solving this challenge. The main objective was to obtain the optimum diversion using downhole "point" and distributed measurements without sacrificing the high injection rates. In response to this need, modifications to the existing downhole measurement system were introduced enabling pumping of rates beyond 5.0 bbl/min. The key focus of the redesign was the repackaging of the downhole tools as well as the telemetry link to surface, resulting in expansion of the operating envelope of the technology.Yard testing has been completed, and results have been encouraging. The solution has been piloted in the field, and a field case study showed remarkable injectivity improvement.

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Setting a New Milestone in Carbonate Matrix Stimulation with Coiled Tubing

Al-Hajri

AL-Ghamdi

Al-Subaie

et al. 2015

SPE Middle East Oil &Amp; Gas Show and Conference

Self Cite

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Case History: New Horizons for Downhole Flow Measurements via Coiled Tubing Equipped with Real-Time Downhole Sensors at South Ghawar Field, Saudi Arabia

BuHassan

Halder

Tammar

et al. 2015

SPE Middle East Oil &Amp; Gas Show and Conference

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During the last 5 years, one of the most common matrix acidizing enhancement techniques used to improve zonal coverage in open hole or cased hole wells is conducting a distributed temperature survey (DTS) using coiled tubing (CT) equipped with fiber-optic and real-time downhole sensors during the preflush stage before the main stimulation treatment. This is used to identify high and low intake zones so the pumping schedule can be modified to selectively place diverters and acidizing fluids with a high degree of control. Once stimulation treatment has been completed, a final DTS analysis is performed to evaluate the zonal coverage and effectiveness of the diversion. Even though this technique has provided satisfactory results, alternative methods providing faster and more accurate understanding of flow distribution between the zones and laterals are needed, especially if there is limited temperature contrast between fluids and reservoir. Thus, an innovative coiled tubing real-time flow tool has been recently developed to monitor flow direction and fluid velocity. This measurement is based on direct measurement of the heat transfer from the sensors to the surrounding fluid using a calorimetric anemometry principle. The first worldwide use of this technology in a Saudi Aramco injector well showed this to be a viable new approach to downhole flow monitoring that can be used by itself or in conjunction with DTS, depending on the constraints of each individual intervention.

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First High-Rate Stimulation Treatment Through Coiled Tubing with Real-Time Downhole Monitoring—A Story of Success

Al-Thiyabi

Al-Ruwaily

Mahmood

et al. 2015

Day 3 Wed, September 16, 2015

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Over the last 10 years, matrix stimulation of multilateral wells has been one of the most fascinating and technology-driven interventions in the oil and gas industry due to the several challenges involved in this kind of operation. Overcoming these challenges, which include lateral identification and accessibility, reservoir assessment, and accurate placement of stimulation fluids, has encouraged operators and manufacturing and service companies to develop innovative techniques and novel technologies. In Saudi Arabia, coiled tubing (CT) equipped with real-time downhole measurements and a multilateral identification tool (LIT) has been one of the most valuable technologies to enhance the interventions in multilateral wells. Initially, the ability to monitor real-time data enabled a more efficient operation of the LIT, as well as optimizing and properly placing the stimulation treatment fluids by avoiding the identified high-intake zones across each lateral. Most recently, the incorporation of gamma ray tool into the real-time downhole measurements package allowed a faster identification of each lateral and accurate depth correlation for pinpoint acid stimulation; nevertheless, when this technology was deployed, pumping rates were significantly limited to a maximum of 2.0 bbl/min due to limitations on downhole tools and optical fiber installed inside the 2 3/8-in. CT. In some cases, this barrier also represented a drawback for optimum fluid penetration and efficient diversion across the zone of interest during the stimulation treatment. This paper documents the first worldwide applications of the enhanced version of a real-time downhole measurements package deployed on 2 3/8-in. CT for the successful matrix stimulation of a multilateral power injector well in Saudi Arabia, where the barrier of 2.0 bbl/min was far exceeded while maintaining intact all downhole readings. The operation represented a significant increase in operational efficiency and set a new record for this technology. A total of 4,585 bbl of stimulation fluids were injected across the open hole laterals (7,685-ft combined on both wells) at maximum rate achieved of 4.6 bbl/min, which were successfully accessed with the use of the LIT in a single run without the need to pull out the CT to surface. The use of enhanced the real-time downhole measurements package reduced the operational time by almost 50%, enabled more effective formation damage removal by injecting stimulation fluids at a higher rate, provided real-time depth correlation, verified access via gamma ray to each lateral without the need to tag total depth, and resulted in a tangible cost reduction.

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Tangible Values for Running Distributed Temperature Survey (DTS) as Part of Stimulating Multi-Lateral Injection Wells

Cited by 7 publications

References 2 publications

Setting a New Milestone in Carbonate Matrix Stimulation with Coiled Tubing

Setting a New Milestone in Carbonate Matrix Stimulation with Coiled Tubing

Case History: New Horizons for Downhole Flow Measurements via Coiled Tubing Equipped with Real-Time Downhole Sensors at South Ghawar Field, Saudi Arabia

First High-Rate Stimulation Treatment Through Coiled Tubing with Real-Time Downhole Monitoring—A Story of Success

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