New Hybrid System Brings the Flexibility of Coiled Tubing to Very Long Extended-Reach Wells
- Fraser McNeil (Halliburton) | Sharlene D. Lindsay (Halliburton) | Robert Lyons | Randal Paul Gracey (Halliburton)
- Document ID
- Society of Petroleum Engineers
- SPE/ICoTA Coiled Tubing & Well Intervention Conference and Exhibition, 5-6 April, The Woodlands, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2011. Society of Petroleum Engineers
- 2.5.2 Fracturing Materials (Fluids, Proppant), 3.2.4 Acidising, 2.4.5 Gravel pack design & evaluation, 1.7 Pressure Management, 4.1.2 Separation and Treating, 2.4.3 Sand/Solids Control, 1.14 Casing and Cementing, 3.2.2 Downhole intervention and remediation (including wireline and coiled tubing), 1.6 Drilling Operations, 1.7.5 Well Control, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 1.10 Drilling Equipment, 3 Production and Well Operations, 2.2.2 Perforating, 3.2.3 Hydraulic Fracturing Design, Implementation and Optimisation, 2 Well Completion, 1.6.1 Drilling Operation Management, 1.6.9 Coring, Fishing
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The number of long, extended-reach wells being drilled in the oil and gas industry continues to increase. These wells present complex challenges in completion and intervention procedures because operators demand the same level of performance achieved on shallower wells while providing a cost-effective and safe solution.
To reach deep target depths with coiled tubing (CT), smaller coil must be used because of reel capacity, which limits pumping rates because of pressure and velocity limitations. Many areas have road weight restrictions that will also dictate the size and length of CT that can be used. As an alternative, jointed pipe can be used; however, using jointed pipe reduces the overall efficiency of the process, as continuous pumping cannot be achieved.
The new hybrid system uses both CT and jointed pipe in a single workstring. The system incorporates a unique flapper safety valve that enables seamless functioning of the string in a live well. The hybrid system enables larger CT and jointed pipe to be deployed, which results in higher pumping rates and depths. This reduces the overall job time, while improving safety and efficiency for deeper well applications, including multizone stimulation, cleanouts, drilling, and mill-outs.
This paper presents the hybrid system design and benefits in multizone stimulation, drillouts, cleanouts, and other well-intervention applications. Also included is a case history to demonstrate the success of the system when applied in a multizone fracture-stimulation treatment.
CT is a vital tool for oil and gas operators to achieve safe, efficient, and effective well-intervention operations. Typically ranging beyond 25,000 ft in length and from 1 to 2.875 in. in outside diameter (OD), these continuous strings of pipe are uncoiled into live wells to perform milling, drilling, cementing, logging, perforating, fracturing, completion, or maintenance operations. Deeper well completions with extended-reach horizontal laterals have presented some unique problems to those seeking to perform well-intervention operations.
Limitations of Large CT
Road Size and Weight Restrictions. Larger CT sizes are preferred to achieve higher treatment rates, cleanup rates, and in getting to the target depth when running in hole. However, the ever-increasing depths of these wells present difficulties for large CT, beginning with size and weight limitations enforced on all roads. In the US, legal size and weight limits have been established for vehicles and loads when operating on state-maintained roads and bridges. These federal and state restrictions can include width, height, length, and weight. Each of these limits has a maximum allowable and an upper threshold at which an escort(s) and permits are required. In some cases, routes must physically be inspected and certified by authorities. These limits are enforced, where charges, fees, and fines are levied which can prove costly.
|File Size||3 MB||Number of Pages||20|