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Case Study: CoilFRAC Treatment Doubles Production in Texaco´s Hiawatha Field



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The CoilFRAC service crew completed 4 wells and 21 stages in the Hiawatha field for Texaco.


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Production logs show that new wells stimulated with the CoilFRAC treatment outperformed conventionally stimulated older wells.

Effective stimulation of Rocky Mountain sandstone formation increases recoverable reserves by more than 75%


Challenge

Separately stimulate multiple vertical sand layers with varied fracture gradients in Rocky Mountain well without increasing completion costs.

Solution

Use CoilFRAC stimulation through coiled tubing (CT) to individually stimulate each layer in one run into the wellbore.

Results

Increased recoverable reserves per well by more than 75%.

Vertical sand layers with varied fracture gradients

The Hiawatha field in the Rocky Mountains comprises multiple vertical sand layers that are from 5 ft to 60 ft thick and distributed from 2,000 ft to 5000 ft. Texaco completed wells in this field primarily with limited entry, but also with bridge plugs when the distance between layers was significant. However, because of varied fracture gradients for each sand layer, many layers were not being effectively stimulated. In addition, some marginal layers were bypassed because of economic constraints. Texaco was looking for an effective way to stimulate each interval separately without increasing completion costs.

Effective stimulation in one run

CoilFRAC technology was chosen to effectively stimulate each interval separately. In the CoilFRAC stimulation process, all producing layers are perforated conventionally. CT is then deployed into the wellbore with a straddle tool bottomhole assembly. The bottom layer is straddled and the fracture stimulation is pumped through the CT.Residual proppant is then reverse circulated out of the wellbore and the straddle tool is moved to the next interval, where the process is repeated. Through this process, each layer is individually stimulated in one run into the wellbore.

Increase in recoverable reserves

Based on the results of the four-well test, the most significant impact of the CoilFRAC treatment was that the recoverable reserves per well increased by more than 75%. For example, one well in the field was producing 1.9 MMcf/d from one limited-entry fracture stimulation of multiple layers. Some bypassed layers were perforated and the entire well was restimulated. Eight consecutive fracture stimulations were performed in 1 day, and the stabilized production from the well was recorded at 5.3 MMcf/d. In addition to a more effective stimulation on each layer, the treatment took 1 or 2 days as compared to several weeks that the conventional technique would have taken. The time, cost, and risk of milling composite bridge plugs were also eliminated using the CoilFRAC technology.

About the Contact family

CoilFRAC technology is part of the intervention category of the Contact four-category portfolio of staged fracturing and completion services. These technologies maximize reservoir contact by offering the most efficient and effective services for each well. The Contact intervention category enables multiple stages to be perforated/jetted, fractured, and isolated in one intervention. Contact services can be enhanced with real-time measurement options.

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