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Technology Applications

Chris Carpenter, JPT Technology Editor

Wellhead Outlet

AnTech launched three new products within its Wellhead Outlet (WHO) range. The Type C Wellhead Outlet, which was designed and developed by the company for use in hazardous environments, features safe and simple installation, created in compliance with a broad range of professional standards (Fig. 1). AnTech has launched three further outlets based upon the Type C, including Types CB, CC, and CD. Each adaptation has been designed to suit various working environments, including pressure ranging from 5,000 to 15,000 psi, temperatures from -60°C to 160°C, and various voltages.  Wellhead Outlets Type CB and CC are focused on lower-cost applications where a high level of specification is required. The Type CD wellhead outlet has been designed accredited with the Type 1, Division 1 certification, allowing it to operate safely in some of the world’s most stringent wellsite environments, including the Gulf of Mexico. Because the company’s wellhead-outlet products require minimal connections, they are a safe and efficient alternative to multiple connectors. The Type-C range brings substantial cost benefits to clients at a time when operators must reduce expenditure.

Straddle-Packer System

Baker Hughes introduced its OptiStriker straddle-packer system, which enables aggressive, targeted restimulation of individual perforation clusters in existing wells to boost production efficiently and effectively. The system features a large inner diameter and two rugged and resettable coiled-tubing packers, offering a pump rate of 20 bbl/min and a differential-pressure rating of 10,000 psi to enable high-rate, high-volume treatments that optimize well restimulations and maximize production. During cased-hole operations, the two packers work in unison to straddle and isolate individual clusters within the wellbore. This ensures that fluids are directed to areas that may have been untreated or undertreated during the initial stimulation. After the packers are set in the wellbore, a controlled volume of fluid and proppant can be pumped through the coiled tubing or workover tubulars and delivered to the desired areas. This targeted-stimulation technique uses only the amount of fluid and horsepower needed to treat each cluster, minimizing operational requirements and reducing costs by more than 30% compared with other restimulation techniques, while maximizing the speed and effectiveness of treatments. Fluids may enter the formation through the original perforations, or additional perforations can be created with the system’s sand-jet perforator, eliminating the need for a dedicated tubing-conveyed-perforating run.

Free-Fall-Lifeboat System

Harding has been awarded contracts for nine FF1200 free-fall-lifeboat systems complete with davits on the Heerema Offshore Services semisubmersible crane vessel Sleipnir. The vessels will be built by Sembcorp Marine at its flagship Tuas Boulevard Yard in Singapore. The FF1200 is a 70-person free-fall lifeboat designed to Det Norske Veritas OS E-406 standards, the most stringent in the industry, exceeding Safety of Life at Sea rules for free-fall lifeboats (Fig. 2). The boats will be perfectly matched with their LA1200H and LA1200HO skid-launch davits especially designed for the FF1200. The FF1200 features superior space and comfort based on 100-kg/person estimates. Seats with five-point seat belts provide safety and comfort, while the FF1200’s structural design gives the lifeboat maximum strength. In May of 2013, the FF1200S set a world record when it was successfully launched from 65 m. The lifeboat also exhibits significant positive headway and minimum accelerations (g-­forces) in extreme conditions and makes use of a high-powered engine.

Completions-Evaluation Services

MicroSeismic introduced a series of ­completions-evaluation services to quantify and predict reservoir drainage and production. These new services advance completions evaluation for unconventional wells beyond the commonly used modeling approach to a new ­observation-based approach. The newly developed analysis methods use observations taken directly from the reservoir, capturing the effects from hydraulic fracturing, providing more-accurate specific estimates of future incremental production and estimated ultimate recovery (EUR). These services help operators develop entire fields better by predicting accurate per-well and per-stage performance just weeks after completion. The first of the services is PIndex, an estimate of the well’s relative productivity. It shows a direct comparison of well productivity and identifies differences between wells, providing immediate feedback to adjust overall completion strategies. The second service, DIndex, quantifies the well’s current and future reservoir drainage ­volume and drainage pattern. The result is a map of future incremental reservoir depletion, showing when drawdown pressures from adjacent wells will interact with each other. Finally, Production Forecast is a service that predicts each well’s future incremental production and EUR after the well is completed. Because the Production Forecast is based on the post-treatment reservoir, it has been far more accurate than other common statistical methods for predicting production.

Microleak-Detection Solution

READ Cased Hole introduced a microleak-detection solution to help maximize operational safety and minimize downtime by delivering fast and reliable answers for well-integrity-management decisions. The diagnostic solution combines GE Oil & Gas’ NTO Acoustic Noise Tool and READ’s Micro-Leak Detection service line. The solution creates a detailed map of downhole acoustic energy, which, when combined with measurements from flowmeters and fast-response temperature sensors, enables precision location of leak sites, identification of active flow pathways, and determination of the sources of flow energy. READ’s specially developed Micro-Leak Detection software segregates the acquired acoustic data according to the frequency of the captured sound energy, enabling spectral analyses of the data and accurate diagnosis of unwanted flow events associated with well-integrity issues. READ’s in-house expert analysts worked extensively on the microleak-detection technology, focusing on data-processing and -­visualization software development and investing more than a year into field trials. As a result of the accuracy of the derived information and speed of response provided by the service, operators gain the factual, to-the-minute intelligence they need in order to optimize their remediation strategies.

Damaged-Control-Line Safety-Valve System

The Weatherford damaged-control-line (WDCL) safety-valve system, part of the Renaissance system of safety valves, enables operators to replace damaged control lines and install new surface-­controlled subsurface safety valves (SSSVs), thereby restoring operation of the well. In the past, the only ways to restore damaged control lines were to use a storm choke or to kill the well and pull tubing, which can significantly damage the formation. The WDCL system offers a safer, more-cost-effective alternative. The system consists of the Ren Gate wellhead-penetration conversion kit, a control-line hanger, a ­control-line stinger, and a ­wireline-retrievable SSSV (Fig. 3). Because the WDCL system is deployed by standard wireline and capillary string units, without the need for any mechanical devices, it results in less downtime compared with tubing workover operations. In an offshore well in Indonesia, the WDCL system successfully replaced a blocked control line and installed a new SSSV, maintaining the original production rate of 2.6 MMscf/D and eliminating the need for a workover. The WDCL system fits into any size safety valve from 2⅞ in. through 7 in. New safety valves are sized to match the production tubing.

Swing-Check Valve

Victaulic has extended the size range of its Series 713 swing-check valve to include 2- to 4-in. sizes. The additional sizes enable the grooved-end check valve to be used on a wider range of high-pressure piping systems, offering operators quick, simple installation and maintenance. The Victaulic Series 713 swing-check valve offers higher working pressures than previous designs, for greater versatility (Fig. 4). Designed for headers that feed upstream facilities as well as other high-pressure services, the valve can be used in applications requiring Class 300 pressure ratings. The 2-in. valve is rated to 1,000 psi, while the 2½-, 3-, and 4-in. sizes are rated to 750 psi. Featuring grooved ends, the Series 713 swing-check valve is joined by use of Victaulic couplings, enabling quicker and easier installation and maintenance than flanged valves. The valve can be joined to pipe with the Victaulic Original Groove System or EndSeal grooved ends. The valve is designed for use in horizontal installations and can be coated for use in corrosive services.