From 83 bbls To 157 bbls in 4 Hours, 19 Minutes with Extreme Pulse Technology (ExP)

Location: Permian Basin, West Texas

Problem: Calcium carbonate scale with some Fe in tubing, casing and near wellbore region

Objective: Utilize 1.25″ CT with the 1.33″ ExP BHA for removal of blockages and calcium carbonate scale from tubing, casing, perforations and near wellbore region, utilizing produced water acid and N2 (when needed).

Spot 8% inhibited and HCL acid across the perforations to help with stimulation of the formation.

Procedure: The ExP tool was deployed via 1.25″ third party coiled tubing. An initial pump rate of .25 bbls/min was pumped with circulating pressures of 1,200psi.

When a blockage was encountered, the CT was picked up by 50ft and the fluid rate was increased to .5 bbls/min, which removed the debris blockage which was seen at surface 16 minutes later.

Throughout the operations large pieces of scale and debris was observed in the flow-back returns at surface. As depth progress continued fluid rates increased to increase AVs, while the turbulent flow kept solids in suspension. Upon complete removal of all scale and debris, 8% HCL acid was spotted across the perforations to help stimulate the near wellbore region.

Total Time from RIH to TD: 4 hours 19 minutes

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Result Removed all scale
Pre-ExP Intervention 83 bbls
Post ExP Intervcention 157 bbls
Tubing 2 3/8″
Casing 5.5″
Well TD 8,375′
CT Size 1.25″
CT Speed 50-100 ft/min
Circulation PSI 1,900 to 4,500
Fluid Flow Rate 0.25 bbls to 1 bbls/min
N2 Flow 200 to 500 CFM
Acid 10 bbls


Extreme Pulse Technology (ExP) implements multi-flow conditioning patterns through a series of resonating chambers, which create dynamic high and low pressure events during workover (cleanout) operations.

The ExP surge clean out tool can be utilized in oil, gas and water wells for optimal cleaning of the wellbore and near wellbore regions. When utilized for surge clean out of injection, wastewater and disposal wells the ExP will help improve injectivity by breaking and removing debris within the near region. Read more about ExP

Coil Tubing Technology, Inc. (CTT) supplies a full line of enterprise-class, proprietary coiled tubing tools. The core business of the Company is worldwide development and marketing of specialty tools and related innovative technical solutions used with coiled tubing and jointed pipe in the bottomhole assembly for the exploration and production of hydrocarbons.

Since its formation in 1998, CTT has specialized in the design of proprietary tools for the coil tubing industry, concentrating on four categories of tubing application: thru tubing fishing; thru tubing workover and intervention; pipeline clean out; and coil tubing lateral drillout operations.