An Effective Horizontal Well Completion and Stimulation System
- Rocky Allen Seale (Packers Plus Energy Services) | James Athans (Packers Plus Energy Services) | Daniel Jon Themig (Packers Plus Energy Services)
- Document ID
- Society of Petroleum Engineers
- Abu Dhabi International Petroleum Exhibition and Conference, 5-8 November, Abu Dhabi, UAE
- Publication Date
- Document Type
- Conference Paper
- 2006. Society of Petroleum Engineers
- 5.8.6 Naturally Fractured Reservoir, 4.1.2 Separation and Treating, 1.8 Formation Damage, 2.5.2 Fracturing Materials (Fluids, Proppant), 1.14 Casing and Cementing, 3 Production and Well Operations, 1.6 Drilling Operations, 2.2.2 Perforating, 5.8.7 Carbonate Reservoir, 5.8.2 Shale Gas, 4.2.3 Materials and Corrosion, 2.4.3 Sand/Solids Control, 1.6.6 Directional Drilling, 2 Well Completion, 2.5.4 Multistage Fracturing, 5.1.2 Faults and Fracture Characterisation, 1.2 Wellbore Design
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Over the last two decades many developments have enabled accelerated growth in horizontal drilling. Drilling has led the way, with current technology capable of drilling thousands of feet laterally through a hydrocarbon reservoir. Second, has been completion and stimulation advancements. Initially horizontal drilling was limited to naturally fractured reservoirs with simple open hole or slotted liner completions. This was due primarily to the ability of the reservoir to flow economically without the need for stimulation. Reservoirs requiring stimulation were not candidates for horizontal drilling. Developments in completion and stimulation technology specific for horizontal drilling have broadened the application range for the technology.
Until recently there have been two completion and stimulation option. The horizontal can be completed open hole, or with slotted or perforated liner. This has essentially negated any effective stimulation along the entire length of the horizontal wellbore. The second completion system requires cementing the production liner and running multiple isolation systems to effectively treat different sections of the wellbore. This requires multiple coiled tubing trips along with multiple rig up and rig down of the stimulation equipment involved. These multi-stage horizontal completions take weeks to complete at high cost and elevated risks. Ultimately, the high completion costs or the lack of production due to ineffective stimulation make many reservoirs uneconomical to exploit.
This paper will detail a new completion system which is run as part of the production liner, which does not require cementing and provides positive mechanical diversion at specified intervals, so fracturing and stimulations can be pumped effectively to their targeted zone. Details of the engineering design and testing will be specified, with elaboration on the applications and case histories were these systems have been successfully deployed. The case histories will detail the operational efficiencies of the system in conjunction with the enhanced production realized.
Horizontal drilling has maintained steady growth for well over a decade and in many cases has become the exploitation method of choice for infill drilling and reservoir depletion. However, there were certain technology voids that were slowing the growth of horizontal drilling. These technology short comings were the ability to effectively stimulate or fracture the horizontal wellbore from the toe to the heel, particularly in reservoirs that were not naturally fractured. The use of limited entry and bullheading techniques provided little if any benefit compared to vertical wells. Post production analysis on the deliverability of horizontal wells in reservoirs such as matrix, heterogeneous and non-conventional formations showed a direct correlation to the completion and stimulation methods employed and their shortcomings in horizontal applications. Thus, the added expense of a horizontal well was not justified by the equal to or slightly better production results versus vertical wells which were stimulated.1
|File Size||509 KB||Number of Pages||10|