Water production is a serious challenge when stimulating wells in mature reservoirs. Production results after acidizing sometimes reveal a higher water cut; in some cases this change is significant enough that the well is no longer able to flow unassisted. A typical acid stimulation in the field follows a predetermined pumping schedule, where diverter is squeezed into the high water cut interval prior to injecting acid into oil zones. The diverter volume is based on a rule of thumb and the acid is pumped after assuming that the diverter is efficiently sealing the high water cut zone. Several coiled tubing (CT) matrix stimulation jobs have yielded production results of 100% water cut.Prior to stimulation (a period of months or years), diagnostic logs were conducted to identify water producing intervals. Although, in some cases, the post-stimulation water cut may be as high as or higher than the water cut prior to the stimulation, suggesting that the diverter volume was not enough to seal the water zone. An innovative method is needed to confirm the isolation of high water cut zones before pumping acid, which would lead to increased oil production and reduce the risk of unintentionally stimulating water producing zones.
Companies in the exploration and production (E&P) business often suffer from communication challenges as the enterprise grows. These businesses are typically an amalgamation of merged or acquired companies and organically grown assets. Whether the enterprise is organized along functional or asset-based lines, communication outside the normal bounds of the organization can be a challenge. Individuals and teams working on complex problems are often unable to harness all of the company's intellectual capital because their network of colleagues is limited to those colleagues they personally know.In the last decade, the emergence of Web 2.0 has changed the way that people consume and share information. Visitors to websites are no longer merely consumers of content, but can create, add to, or modify content visible to other users. This shared online space has brought individuals together and enabled the exchange of ideas in ways not previously possible. Given the way that social media has changed the landscape of society, this technology holds great potential to change the way companies conduct their internal business as well.Devon Energy evaluated the use of a Knowledge Network through a pilot project built on a foundation of commonly available software (Microsoft SharePoint). Participants were completions engineers with a wide range of experience, hailing from a variety of divisions and geographic locations. These engineers identified areas where social computing could be helpful, such as finding experts within the company, building relationships, sharing knowledge, asking questions, and rapidly assembling teams to address issues facing multiple divisions. Participants tested the tools against all of these scenarios, including team projects to address real completions engineering issues with material impact to the company.Participant feedback and business results from the pilot project have resulted in the Knowledge Network being sanctioned for deployment not only in engineering disciplines, but for all areas of the company. Through the pilot process, we came to understand why previous knowledge management efforts had met with little success. The paper outlines the changes necessary to establish and maintain a culture of community learning, from organizational structure, to participant expectations, time and money invested, and even to management expectations of return on software investments.
TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractPrudhoe Bay, located on the North Slope in Alaska, performs 300 to 400 coiled tubing (CT) interventions per year, employing the latest CT technology. This paper discusses a field trial of CT with an installed fiber-optic line. To date, over 150 CT with fiber optics (FOCT) operations have been successfully performed in BP-owned leases at Prudhoe Bay and Kuparuk in Alaska. Cementing, perforating, fishing, milling, and other wellwork operations were successfully conducted during the two year field trial.The system allows real-time depth, downhole CT pressure, and downhole temperature readings. Real-time temperature can also be measured along the entire length of the CT for distributed temperature surveys. Accurate depth control has been the primary benefit of FOCT at Prudhoe Bay, allowing single trip perforating, plug, and straddle setting.This has resulted in efficiency improvements when adding long perforation intervals, as well as prolonging CT life in the field's abrasive chrome completions. FOCT has become a key enabler for multilateral intervention and an operational case history in a penta-lateral well is described.
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