Wednesday, December 17, 2014

892 m: Premature end to DFDP-2B

Rupert Sutherland, GNS Science and Victoria University of Wellington
John Townend, Victoria University of Wellington
Virginia Toy, University of Otago


A core of cement and borehole wallrock from 471 m depth. 15/12/14. R. Sutherland.

Yesterday afternoon, we decided that it was not sensible to continue drilling in the DFDP-2B borehole. We will not drill in January 2015. The broken PWT steel casing is severely misaligned and cannot be repaired. We will securely cement it in place, and then use the well as a geophysical observatory – though with less capability than planned, and above the fault.

It would be possible to continue drilling from 463 m in the DFDP-2B hole, but only with a 4.5” (114 mm) bit, or smaller. A range of technical and safety concerns make it very unlikely this is a feasible way to achieve our goals below 1000 m depth.

Our primary concern now is to ensure that the final cementing operation is done well. This is scheduled for later today (Wednesday 17/12/14). After Christmas, we will drill out the excess cement to leave a sealed borehole to a depth of 400 m. We will install a wellhead, a seismometer, and then make temperature measurements.

This is not the end of the DFDP-2 project. We did not achieve our goals of making observations and installing instruments within and below the fault zone in DFDP-2B; but we obtained important data and samples to a depth of 893 m. These show that the Whataroa Valley is even more interesting than first thought, and that our original plan was feasible.

This project is interesting to the international science community, because we are investigating a fault that is due to fail in a large earthquake, and because we can investigate it deep enough to account for the complications of mountainous terrain above. This has not been done before.

We have learnt that the Whataroa Valley is much hotter than anticipated. The base of our planned borehole at 1300 m has a temperature of about 190°C. Temperature is fundamental in rock mechanics, and 190°C puts us in the lower half of the brittle crust, where some very important earthquake processes occur. Sampling any fault in this state would be an important world first. It is high risk, but with potential for very high reward.

More blog posts will follow…

Virginia Toy walks past a table of concrete. It was not what we had hoped for.
14/12/14. R. Sutherland


Funded by: the International Continental Scientific Drilling Program (ICDP); the Royal Society of New Zealand Marsden Fund; GNS Science;Victoria University of Wellington; University of Otago; and governments of NZ (MBIE), UK (NERC), & USA (NSF).

39 comments:

  1. Geothermal gas exists in Otira vuaduct approx 500-700m west of Candys bend toward Otira. It is where an earthquake ruptured the road approx 17 years ago. Why not drill where the ground is already ruptured?

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  3. Hi,
    can you give us the coordinates of this well?
    And how many meters of fluvial sediment did you drill at the river valley? I've heard it was more than 200 m, is that correct?

    thanks

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  31. Million stainless steel seamless pipe production hit a record highCold drawn (rolled) seamless steel pipe: round tube → heating → perforated → beginning → anneal → pickling → oiled (copper plating) → multi-pass cold drawing → cold pipe → heat treatment → straightening → water Pressure test (testing) → mark → storage.[url=http://stainlesscoilstock.com/sheet-stock/7010.html]High Quality AISI 316 4X8 Stainless Steel Sheet For Wall Panels[/url]Cold drawn (rolled) seamless steel pipe rolling method than hot-rolled (extruded seamless steel pipe) complex. The first three steps of their production process is basically the same. The difference from the fourth step, the round tube blank after the blow, to start, anneal.[url=http://steelcoilsales.com/on-sale/12084.html]precio de acero inoxidable por tonelada 304 316 chapa de acero inoxidable[/url]After annealing with a special acid liquid pickling. Pickled, oiled. Then followed by a multi-pass cold drawing (cold rolling) and then pipe, special heat treatment. After heat treatment, and steel pipe cooling process the same treatment.[url=http://stainlesssheetprice.com/products-list/6950.html]hot rolled AISI ASTM 304 stainless steel round bar[/url]First, the thicker the wall thickness of the product, the more economical and practical it is. The thinner the wall thickness is, the higher the processing cost of the product is. Second, the process of the product determines its limited performance. Seamless steel pipe with low accuracy: uneven wall thickness, low brightness inside and outside the tube, fixed length and high cost, and there are pockmarks on the inside and outside, black spots are not easy to remove; Third, its detection and shaping must be processed offline. Therefore, it shows its superiority in high pressure, high strength and mechanical structure materials.[url=http://steelsheetsupply.com/coil-price/7520.html]Exporting 0.05mm 410 Stainless Steel Wire Factory price[/url]

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  32. CE Series Switches: High Performance and Reliable ProductsHigh performance and high reliability have become the necessary quality of cloud-based data center networks. High-performance, high-reliability networks require high-performance and reliable products. Through years of hard work and market performance, Huawei CE series switches have become synonymous with high performance and reliability.[url=http://switchproductsupplier.com/cisco/4926.html]Poe switch Huawei S3700 28TP PWR EI industrial network[/url]The core data center CE12800 of Huawei data center can be remembered. The whole machine architecture has never changed since its release in 2012. From the initial Gigabit and 10-Gigabit, to the 36-port 40GE, to the industry's highest performance 7.2T, the whole life cycle. The interface boards are compatible to reduce the investment in repetitive purchasing and spare parts storage of the client box. The switch capacity of the whole machine continues to be 3 to 6 times that of similar products in the industry, and the maximum capacity of nearly 50,000 servers in a single data center can be achieved.[url=http://switchproductsupplier.com/cisco/4932.html]Original Huawei Next Router Ar1220W Ar1200 Series Enterprise Routers[/url]Moving on, the CE12800 is a software system that supports high-reliability networks from stacks to M-LAGs to VxLANs to BGP-EVPNs, to virtual ones, using the latest and best networking technologies.[url=http://datacommunicationdevice.com/enterprise-cloud-communications/TP3106-70_TP3206-65_Immersive_Telepresence.html]TP3106-70/TP3206-65 Immersive Telepresence[/url]The CE8860 access switch with four specification subcards that can be flexibly inserted into the card and the newly released 4GB cache access switch CE6870 also demonstrate the capabilities of Huawei data center access switches.[url=http://inverterproducts.com/products/1000W_12_Volt_High_Quality_Power_Solar_Inverter_With_Charger.html]1000W 12 Volt High Quality Power Solar Inverter With Charger[/url]

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