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Abstract Recently a new coiled tubing technology has been used to clean out horizontal wellbores with a low downhole pressure. This technique uses a dual coiled tubing string and a special vacuum tool designed to create a pressure drop across the formation sand face in order to clean out formation fines, unwanted fluids and solids. The work string, used for this application, has a rectangular matrix design; the two 1-1/2"coiled tubing strings are encapsulated into one uniform body using a high strength thermoplastic jacket. The power fluid is circulated down through one of the strings and the returns, including fines and solids, are transported to surface, up the second string. To operate the system, a custom coiled tubing reel, with two rotating joints was designed. The fluid goes through a jet pump (BHA), where it passes through a nozzle creating a "Venturi effect". New software has been developed to simulate the torque and drag, given that the cross section area is similar to a rectangle and it has two contact points, instead of one. A hydraulic simulation has been performed to determine the jet pump performance, circulation rates and pressures. Real time data was used to calibrate the models. The technology has been used for liner clean outs, in horizontal heavy oil (8 API) wells, with low pressure averaging 362 psi at 2625 ft (2.5 MPa; 800 m TVD; ) reservoirs. In the first well, 656 feet (200 meters) of 5-1/2" horizontal slotted liner was cleaned out down to 3008 feet (916 meters) and 4.7 barrels (745 liters) of sand were circulated out to surface (30% of the total internal volume). In the first well the production was recovered from an initial rate 6 bbls/day to 31 bbls/day (1 m3/day to 5 m3/day). In the second well, with 5% H2S, the dual coiled tubing was run in the 4- 1/2" production tubing and the 4-1/2" horizontal slotted liner was cleaned out down to 3550 feet (1082 meters). Based on the results, this technology is proven to be a viable solution for cleaning long horizontal wells with low bottom hole pressures.
- North America > Canada > Alberta > Western Canada Sedimentary Basin > Alberta Basin > Bluesky Formation (0.99)
- North America > Canada > Alberta > Seal Field > Aecog Storm Seal 15-24-82-15 Well (0.99)
Abstract Production logging plays an important role in understanding the impact that well trajectory, completion practices and trials, and well placement have on EUR. The data can further help to characterize the reservoir in new plays. This is particularly true in the case when both water and gas production deviate dramatically from expectations. Logging helps to answer the questions: Are all zones and perforating clusters producing equally? Is the toe unloading? What is the flow regime? Is water production isolated to a particular interval? Can it be shut off? In traditional vertical wells, electric line logging is most often used to acquire production data. In a horizontal well, both active and memory tools can be deployed on coil tubing to acquire production data. Using coil tubing for production logging has its own unique challenges, one of which is getting to TD without damaging the tools. The difficulty of this challenge can be compounded by long lateral lengths and high dog leg severity. Well trajectory, well flow regime, water rate, and gas rate all have an effect on choice of logging tools and method for deployment. This paper will discuss two production logging attempts: 3 successful logs with active tools and 1 failure with memory tools. The one failed attempt involved a low gas rate, low pressure, high water rate well with severe dog legs near the heel where the coil could not reach the logging interval. The sections in this paper will discuss the role of an effective cleanout and how to achieve its success as well as best practices for acquiring high quality production data. Each of the four logging jobs will be discussed in detail with results provided.
- North America > United States > West Virginia (0.50)
- North America > United States > Virginia (0.50)
- North America > United States > Pennsylvania (0.50)
- (3 more...)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Mudrock > Shale (0.40)
- Geology > Petroleum Play Type > Unconventional Play > Shale Play > Shale Gas Play (0.40)
- North America > United States > West Virginia > Appalachian Basin > Marcellus Shale Formation (0.99)
- North America > United States > Virginia > Appalachian Basin > Marcellus Shale Formation (0.99)
- North America > United States > Pennsylvania > Appalachian Basin > Marcellus Shale Formation (0.99)
- (3 more...)