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  6. Three Tips for Job Planning

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- [Narrator] Of course, not all the tools work all the time. There are certain steps, some gotchas to be aware of in case you decide to design a microfracturing run. The first one is to minimize solids in the mud. Ideally we're gonna have less than 5% solids by volume. But sometimes that's not feasible, depending on the mud circulation issues that we are having in the wellbore or if you wanna achieve a certain mud wave. It requires extensive discussion between the drilling engineer, the mud engineer and whoever is designing this test, because you can see that these solids can block hydraulic pump O-ring mud check valves in our seal. Here, right next to a vug in a carbonate reservoir. And when we receive the pack on the surface we notice that elastomer has protruded out. That causes a lot more wear and tear on this elastomer material, and whenever feasible, it's good to acquire a winch vug prior to manufacturing, that way you can look at the image data, try and find where you have billing and use fractures, where you have vugs, and in turn a wide source of both. It requires extensive pre-job planning, because in most cases you'll just have a few hours from the time it takes to upload the image data and in the purchase I like to process it and decide where you stick the pack with all that. The third tip is to design test with Packer Specs from Vendor and Borehole size, and the source is gonna be different depending on the kind of packer you're using, what type of logging company you're using, but the basic concept still applies. What I'm showing is the maximum differential pressure of the tires and the mud grade at a particular depth, on the y-axis, versus the hole size on the x. What you see is that if you're at an 8 and a half or 9 inch hole, you can go up to 4000 psi differential, but if you're in a 12 inch hole, you're limited to just around 2000 psi. In performing this test on an 8 and a half or 9 inch hole it's the sweet spot. We expect breakdown to bee close to the limit or slightly beyond that. You can also use sleeve fracs or cutting on street sidewalks or tire manufacturing, and that can help decrease the hoop strength in the near-level region.