borehole Articles

  • The effective resistivity survey distance between two boreholes

    For borehole survey, the effective survey distance works the same way the surface survey does. This means the wider the electrode takeout, the larger the exploration distance. The rule of thumb to calculate the maximum exploration distance between two borehole is the half of the distance between the top electrode in one borehole and the bottom electrode in the other borehole. ...

  • Surface-point resistivity survey - Case Study

    Drilling boreholes for exploration can be cost ineffective and time consuming. Doing surface-point resistivity survey can provide fast and accurate results, with known position of the target, FlashRES can utilize its electrodes in borehole to target the position of the target, this enables operators to have a good understanding of the interested area. Surface-point resistivity method can also ...

  • Surface borehole resistivity survey case study 1

    Surface borehole method can be used to effectively maximise the value of existing boreholes. This is because surface-boreholre method can give operator more geological and geophysical information around the borehole. For example, we did a surface-borehole survey, where there was already well-known mineralisation existing between 60-80m in Figure one and 100-115m. The inversion resistivity ...

  • Rehabilitation techniques - Use of combination chemical for borehole rehabilitation

    Geoquip Water Solutions, in partnership with Aquabiotics Industrial and Laval Underground Systems, has been developing a borehole maintenance programme for the last ten years and their programme, which incorporates the BoreSaver ...


    By Geoquip Water Solutions

  • Bridge/tunnel base exploration case study

    Case 1 A surface-borehole resistivity survey completed for bridge construction As shown infigure 1, this surface-borehole survey was configured to accurately locate known caves for structural reasons. The operator collected 60k data points in only one hour as a result of how the FlashRES-UNIVERSAL can collect all voltage readings for each combination of current electrodes. Figure 2 shows that the ...

  • BOCQUENCE, France: Ecoskid–Elimination of turbidity, iron and microbiological retention

    The resource consists of two boreholes, about 45 m deep, capturing a karstic aquifer (Cenomasian chalk).Because of the spot opening of swallets and the presence of iron, water from the boreholes is temporarily unfit for ...

  • Surface-point resistivity survey case study 1

    Surface-points electrical resistivity surveys area can be used to detect one or several known underground anomalies in timely manner. A minimum of one borehole is needed to carry out Surface-points electrical resistivity surveys. A FlashRES electrical resistivity meter allows users to position active electrodes anywhere they want in the borehole, by conducting the survey in a surface-borehole ...

  • Void and cave detection case study

    Case 3 A crosshole resistivity survey to find karst caves for deep foundation construction          This survey is aimed to find voids for construction safety purpose, as figure below shows, 32 and 20 electrodes were placed into two boreholes respectively. Inversion image found low resistivity areas beside boreholes were likely to be karst caves. Later ...

  • A folded wedge model for determination of true stratigraphic thickness in directional wells

    For exploration and development the geologists and engineers try to know the true stratigraphic thickness (t). The monoclinal and folded bed models are published methods for t calculation. Both models assume parallel beds which can lead to significant deviations. In order to calculate the values of t considering the effects of both folding and stratigraphic variation we propose the 'folded wedge ...


    By Inderscience Publishers

  • Mineral prospecting case study 2

    We had recently carried out a copper prospecting survey. Electrodes were placed on the surface at 5m interval, one cable was connected to electrodes on surface and another cable is put in to the borehole. After repeating the surveys at nearby borehole, we generated two resistivity distribution images. We determined that the band of low resistivity approximately 30m below surface has a high chance ...

  • LIEUVIN, France: Ecoskid–Elimination of turbidity and microbiological retention

    The Saint Aubin de Scellon borehole is subject to large variations in turbidity in rainy periods (karstic aquifer).So Ultrafiltration was chosen for this site to eliminate these peaks in turbidity.The 75 m3/h Ultrafiltration unit will be extendable to 150 ...

  • Transformations of n-alkanes from petroleum pollutants in alluvial groundwaters

    Abstract Investigations presented in this paper were aimed at defining the alterations of n-alkane composition in cases of oil-polluted alluvial sediments. Therefore, oil-polluted groundwater samples, taken in five different time intervals during a period of 28 months, were investigated. Samples of alluvial sediments were taken from two boreholes within an oil refinery at Pancevo, Yugoslavia. In ...


    By Springer-Verlag GmbH

  • Geodrilling Dec 14: Maintaining Reliable Water Supplies

    This article describes Wessex’s problems with iron contamination and the borehole remediation work it has been doing with BoreSaver and Geoquip Water Solutions over the last four years. Water and sewage-treatment company Wessex water, serving an area of the south-west of England, talks us through its groundwater management programme and rehabilitation efforts. Around half of ...


    By Geoquip Water Solutions

  • Frequently asked Questions - Part 2: Stabilizing the Hole

    One of the most important functions of a drilling fluid is to stabilize and maintain a borehole opening. Borehole stability in coarse soils starts with creating an impermeable barrier between the soil and the drilling fluid or slurry via the filter cake (or polymer gel membrane for non-rotary mud drilling such as foundation drilling). Then, positive hydrostatic pressure from having the hole full ...


    By CETCO

  • A Case Study: Overcoming Iron Bacteria Problems in South Africa

    One of two articles published in the December issue of Borehole Water Journal, the magazine of the South African Borehole Water Association. Craig Jones from Midlands Pumps in South Africa is the BoreSaver partner of Geoquip Water Solutions Ltd. Craig outlines case studies that demonstrate the effectiveness of BoreSaver in treating iron oxide, manganese oxide, iron related bacterial and ...


    By Geoquip Water Solutions

  • A Monte Carlo Investigation of a Proposed Screen for NX-Borehole Jack Data

    Heuze has submitted a draft standard guide to the ASTM Subcommittee D18.12 on Rocks and Soils for using the NX-borehole (“Goodman”) jack and calculating the in-situ deformation modulus of rock masses. One aspect of the proposed standard is a “data screen” based on a full platen seating criterion. This article describes a computer simulation study that was performed to test the effect of the ...


    By ASTM International

  • WaterActive Jan 2014: Groundwater Asset Management

    Mike Deed, Managing Director of Geoquip Water Solutions, considers the problems of groundwater asset management in the January 2014 issue of WaterActive. Groundwater boreholes are a key component for commercial operations where large volumes of water are required, as part of the ...


    By Geoquip Water Solutions

  • IFFERNET, France: Ecoskid–Elimination of turbidity and microbiological retention

    The Iffernet plant is located in the southwest of Cahors. The four boreholes at Treboulou can together supply an available water flow of around 230 m3/hr. The main characteristic of the raw water is a highly variable turbidity: 2 to 190 NTU, sometimes as much as 300 NTU.The station was built in two phases: first a skid in 2001, then an Ecoskid™ in ...

  • Effects of Borehole Fluid on Standard Penetration Test Results

    The standard penetration test (SPT) represents the most widely used in-situ test method for evaluating the liquefaction resistance of saturated soils. Significant progress has been made in recent years in developing correlations between SPT results obtained using different test procedures and equipment in order to develop a higher degree of standardization for SPT testing. One of the heretofore ...


    By ASTM International

  • Reproducibility of Borehole Shear Test Results in Marine Clay

    An investigation was conducted to determine the variability of borehole shear test results obtained in testing soft and medium consistency marine clays. A statistical comparison of the results of stage tests obtained by different operators at two test depths at a research site is made. An additional comparison of the results obtained from stage tests and fresh shearing and a brief discussion of ...


    By ASTM International

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