NVision HandHeld Scanner Helps Increase Life of Hydraulic Fracturing Tools
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NVision HandHeld Scanner Helps Increase Life of Hydraulic  Fracturing Tools


(September 15, 2010) - A major manufacturer of hydraulic fracturing tools for  the oil and gas industry is using NVision's HandHeld laser scanner to increase  the performance and life of its products by gaining a clearer picture of erosion  patterns. The company previously used ultrasonic sensors to measure discrete  points in a gridded pattern after erosion testing with proppant. The HandHeld  Scanner provides a much clearer understanding of erosion patterns by measuring  millions of points and providing a comparison of the geometry before and after  testing with color deviation models showing the amount of material that has  been eroded in each area of the tool. This information helps engineers gain  an intuitive understanding of tool performance, which in turn helps improve  design and substantially increase tool life.

Hydraulic fracturing involves pumping a fracturing fluid into a well bore at  a high enough level of pressure to cause the formation to crack, enhancing the  flow of oil and gas from the formation to the well. A slurry material called  proppant, which commonly consists primarily of sand or ceramic material, is  then injected into the fracture to prop it open, thereby increasing the flow  of formation fluids. However, the proppant is highly abrasive and erodes the  casing and tools. After they have eroded to a certain point, the equipment needs  to be replaced, which is expensive in terms of labor and tool cost, but most  important delays the completion process.

The tool manufacturer ran tests of different tool geometries and materials  in an effort to extend tool life. Typically, these tests involve pumping large  volumes of proppant through the tool and measuring the resulting wear. Normally  these measurements are performed with an ultrasonic scanner that determines  the thickness at each point where a measurement is taken. The problem with this  approach is that it's impossible to measure enough points get a complete picture  of the tool's geometry. Engineers working on the tool design know in which areas  the erosion has occurred but lacking knowledge of the complete geometry makes  it difficult to fully understand the erosion patterns.

After some investigation, the manufacturer decided to perform the erosion measurements  with the NVision HandHeld Scanner. A key advantage of the HandHeld Scanner is  that it is mounted on a mechanical arm so it can move freely around tools of  any size. The mechanical arm keeps track of the scanner's location so all data  is collected within the same coordinate system. As technicians inspect the tool,  the scanner generates a point cloud consisting of millions points each with  x,y,z coordinates and i,j,k vectors. The laser scanner also provides far superior  accuracy - to a few thousandths of an inch - compared to ultrasonic sensors,  which can be off by as much as 100 thousandths of an inch. Integrated software  that comes with the scanner is used to convert the point cloud to an STL polygon  mesh. Reverse engineering software then converts the STL data to a surface model.  At different phases during the process, the surface models are compared to the  original model, illustrating erosion and wear patterns of the tool.

The accuracy of the HandHeld Scanner and the ability to visualize the wear  caused by the proppant has helped the manufacturer improve both the geometry  and the materials of its tools. As a result, the manufacturer has implemented  the design changes necessary to significantly increase the performance and life  of its tools.


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