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Tuesday, April 21, 2020 | History

3 edition of Drilling mud invasion of unconsolidated aquifer materials found in the catalog.

Drilling mud invasion of unconsolidated aquifer materials

C. R. Dudgeon

Drilling mud invasion of unconsolidated aquifer materials

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  • 31 Currently reading

Published by Australian Govt. Pub. Service in Canberra .
Written in English


Edition Notes

Statementby C.R. Dudgeon and R.J. Cox.
SeriesTechnical paper / Australian Water Resources Council ;, no. 17, Research project / Australian Water Resources Council ;, no. 71/25, Technical paper (Australian Water Resources Council) ;, no. 17., Research project (Australian Water Resources Council) ;, no. 71/25.
Classifications
LC ClassificationsMLCM 91/11710 (T)
The Physical Object
Pagination216 p. :
Number of Pages216
ID Numbers
Open LibraryOL1655513M
ISBN 100642501424
LC Control Number91216143

@article{osti_, title = {Laboratory study of acid stimulation of drilling-mud-damaged geothermal-reservoir materials. Final report}, author = {}, abstractNote = {Presented here are the results of laboratory testing performed to provide site specific information in support of geothermal reservoir acidizing programs. The testing program included laboratory tests performed to determine the. When even heavy drilling mud cannot prevent the caving of hole walls, well casing must be emplaced as drilling proceeds. Caving, lost circulation, and conditions associated with the encounter of flowing artesian water constitute the most common drilling problems. The design of a deep-cased well in an unconsolidated aquifer must include. full thickness of the fluvial aquifer was cored by driving a m long, cm diameter split spoon. A cm diameter tri-cone rock bit was used to drill after each m of new coring. Synthetic drilling mud was used during the process. A cm outer diameter steel casing was driven to new cored and drilled depths to hold back theFile Size: 1MB. unconsolidated materials, and soil. drilling mud is used as the circulating fluid. In both methods, the circula ting fluid is pumped down For example, drilling fluid invasion and the buildup of borehole filter cake may reduce the effective porosity of the aquifer in the vicinity of the borehole. In addition, bentonite.


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Drilling mud invasion of unconsolidated aquifer materials by C. R. Dudgeon Download PDF EPUB FB2

Drilling fluids include clean water and prepared mixtures of special-purpose materials. The fluid is usually a mixture of water and special viscosity-building additives (various types are described later).

For drilling unconsolidated formations, drag bits (fishtail and three- and six-way designs) can be used. Lost circulation is carried out through one of two basic mechanisms: invasion and fracturing.

Invasion refers to fluid loss to formations that are cavernous, vugular, fractured, or unconsolidated, whereas fracturing mechanism refers to the fluid loss due to hydraulic Cited by: 3.

standard drilling in unconsolidated aquifers can lead to mud invasion and severe washout of formation materials during drilling (Kobr et al., ) and thus further disturbance beyond the borehole wall (Dlubac et al., ).

This can raise questions about whether the NMR logging measurements are repre-sentative of the undisturbed formation materials.

Introduction [2] There are several hydrological methods that can be used to obtain estimates of hydraulic conductivity in unconsolidated groundwater aquifers.

While these methods can provide valuable insight into the hydraulic conductivity within the investigated zone, many of them also have limitations [Butler, ; Chen Drilling mud invasion of unconsolidated aquifer materials book al., ].An aquifer test, which is the most common method used.

Various well drilling methods have been developed because geologic conditions range from hard rock to completely unconsolidated material such as alluvial sand and gravel. Particular drilling methods are employed more frequently in certain areas because they are more effective in penetrating the local aquifers and thus offer cost advantages.

Peter Aird, in Deepwater Drilling, Typical Deepwater Casing Program. Well design and casing programs must address all installation, drilling, and production conditional load perspectives.

Installation shall consider running, cementing, and plug bump ng should additionally consider pressure testing, the maximum drilling mud weight (MW), and all well control assurance issues, i. Developed during the late 19th and early 20th Drilling mud invasion of unconsolidated aquifer materials book, mud rotary drilling is one of the main methods of well drilling for water and oil in areas that contain unconsolidated formations.

In mud rotary drilling, fluid is pumped down the hollow drill pipe, called the kelly, and forced out of jets in the drill bit. Drilling fluid technology for horizontal wells to protect the formations in unconsolidated sandstone heavy oil reservoirs Yue Qiansheng 1,2, *, Liu Shujie 3, Xiang Xingjin 1 1.

School of Chemistry and Environmental Engineering, Yangtze University, JingzhouChina; by: 4. To investigate the effect of aquifer disturbance on hydraulic properties while well drilling at unconsolidated aquifer, the following tests were conducted: the surge block and air-surging methods.

The necessity of using high-viscosity drilling fluids for coring unconsolidated materials presents problems in settling out cuttings, which, if not settled out, would cause excessive weight of the drilling fluid resulting in greater hydrostatic head of the drilling mud column and consequently deeper drilling-fluid invasion.

The manner and size of the drilling-mud pit construction is important Drilling mud invasion of unconsolidated aquifer materials book the cuttings settling process because the drilling mud.

Horizontal wells. Horizontal wells are more susceptible to formation damage than vertical wells for the following reasons. Pay zone in a horizontal wellbore comes into contact with a drilling fluid for a much Drilling mud invasion of unconsolidated aquifer materials book period than a vertical pay zone (days compared with.

Need for Development AM methods of drilling cause compaction of unconsolidated materials in an annulus of variable thickness about a drill hole.

In addition, fines are driven into the formation, drilling mud invasion may also occur there to some extent, and a mud cake may be formed around the hole, in consolidated formations also similar. Drilling fluid density/type is an important factor in drilling and production operations.

Most of encountered problems during rotary drilling are related to drilling mud types and weights. Particular functions of the drilling mud include Drilling mud invasion of unconsolidated aquifer materials book the bit, lifting rock cuttings to the surface, preventing destabilisation of the rock in the wellbore walls and overcoming the pressure of fluids inside the rock so that these fluids do not enter the wellbore.

Some oil wells are drilled with air or foam as the drilling fluid. Aquifer Basics Links. Home. Unconsolidated and semiconsolidated sand and gravel aquifers. The principal water-yielding aquifers of North America can be grouped into five types: unconsolidated and semiconsolidated sand and gravel aquifers, sandstone aquifers, carbonate-rock aquifers, aquifers in interbedded sandstone and carbonate rocks, and aquifers in igneous and metamorphic rocks.

migration and possible fresh water aquifer contamination, proper cementing is of increasing importance. A glossary of drilling terms is included at the end of this chapter. For some readers, it may be wise to read this section first in order to fully understand the text.

DRILLING EQUIPMENT Two basic types of drilling rigs are used for drilling. As stated previously, the unconsolidated sequence at GEMS can be subdivided into two major units. Unit 1, which comprises the floodplain aquifer, is characterized by relatively low EC values with thin, discontinuous zones of high EC, suggesting deposits that consist of.

Cl −, that enter the mud system as a result of drilling salt sections or from formation saltwater flow cause a mud to have high yield strength, high fluid loss, and pH decrease.

Some actions for treatment are dilution with fresh water, the use of dispersants and fluid-loss chemicals, or conversion to a mud that tolerates the problem if the.

This research presents a study of the effect of drilling fluid on the reservoir rock properties. The interactions between the clay minerals existing in the formations and the drilling fluids have been studied.

Two types of drilling fluids, which are water-based ferrochrome lignosulfonate base mud and lime mud, were prepared for the study. About core plugs were prepared from seven oil Cited by: 4.

Mud pits may also be excavated for temporary use during drilling and then backfilled after com­ pletion of the well (sec Chapter II for various mud pit configurations).

Beforethe type of rotary drill used in water well drilling was commonly called a whirler. This equipment used the well casing itself as the drill pipe. The lower end. In addition, standard drilling in unconsolidated aquifers can lead to mud invasion and severe washout of formation materials during drilling (Kobr et al., ) and thus further disturbance beyond the borehole wall (Dlubac et al., ).

This can raise questions about whether the NMR logging measurements are representative of the undisturbed Cited by: 1. Drilling mud invasion of unconsolidated aquifer materials - AWRC Technical report No.

17 (PDF MB) Effects of near-well permeability variation on well performances - AWRC Technical report No. 18 (PDF MB) Hydraulic design data for water wells in unconsolidated sediments - AWRC Technical report No. 22 (PDF MB).

Unconsolidated Aquifer - An aquifer made of loose materials such as gravel or sand. Valley fill materials are often unconsolidated aquifers. Confined Aquifer - An aquifer where water moves beneath a layer of clay or other dense, low-permeability material.

Primary Aquifer (State) - Highly productive aquifers presently being utilized as sources of. Get this from a library. Drilling mud invasion of unconsolidated aquifer materials.

[C R Dudgeon; R J Cox]. The upper layers of the bed materials are deformed by the frictional drag of the overlying ice. Unconsolidated material will act like a ball bearings and allow the glacier to move forward. 1 Introduction Well construction consists of three main components: 9Setting (and pulling) of the well screen 9Placement of a gravel pack of formation stabilizer 9Sealing of the borehole annulus The factors that determine the methods of well construction include the nature and hydraulic properties of the aquifer materials, drillingFile Size: KB.

Most core drillers consider it impossible to core unconsolidated materials and, as a consequence, many will not attempt it. These unconsolidated materials are most commonly referred to as overburden and they are cased off in the exploration-drilling industry, prior to starting any coring operations.

However the overburden is usually of major interest in water-resource investigations. When drilling through the oceanic gas hydrate-bearing sediments, the water-based mud under overbalanced drilling condition will invade into the borehole sediments.

The invasion behavior can influence the hydrate stability, wellbore stability and well logging evaluation. In this work, we performed the numerical simulations to study the effects of density (i.e., corresponding pressure Cited by: 2. A well is an excavation or structure created in the ground by digging, driving, or drilling to access liquid resources, usually oldest and most common kind of well is a water well, to access groundwater in underground well water is drawn up by a pump, or using containers, such as buckets, that are raised mechanically or by hand.

Modern Groundwater Exploration: Discovering New Water Resources in Consolidated Rocks Using Innovative Hydrogeologic Concepts, Exploration, Drilling, Aquifer Testing and Management Methods [Bisson, Robert A., Lehr, Jay H.] on *FREE* shipping on qualifying offers.

Modern Groundwater Exploration: Discovering New Water Resources in Consolidated Rocks Using Innovative Cited by: may be a clay layer in unconsolidated materials or un-fractured bedrock in consolidated materials. The appropriate type of drilling rig to drill through the worst expected conditions at a site shall be used (i.e., air rotary for drilling into bedrock, or mud rotary/direct push for drilling into unconsolidated materials File Size: KB.

The U.S. Department of Energy's Office of Scientific and Technical Information. Dewatering of Multi-aquifer Unconsolidated Rock Opencast Mines – Alternative Solutions with Horizontal Wells Mike MüLLeR¹, tional-drilling (hdd) that reduces environmental impact on excavations and open pit mining.

Labora- with aquifer material with a volume of approximately 70 m³. Three sides of the test station are. Adapted from SMET & WIJK () and WAL () Well development after the completion of drilling is part of the normal drilling procedure. All drilling methods alter the hydraulic characteristics of formation materials in the vicinity of the borehole: fines and drilling fluid additives originating from the drilling process remain in the borehole and block the pores of the surrounding aquifer.

Drilling water wells on Kharyaga oilfield, Timan-Pechora region of Russia, often resulted into poor water production due to aquifer formation plugging with weighting materials and drilled solids and insufficient filter cake removal.

Bentonite-based drilling fluids have been traditionally used for water wells drilling Author: Roman Vladimirovich Bulgachev, Pascal Pouget. The Till Veneer Aquifer System has the most limited ground-water resources of the unconsolidated aquifer syt em in hc ou.T apdv rb 50 fW lC,g w the depth to the bedrock surface is less than 50 feet.

There is little potential for ground water production in the Till Veneer Aquifer. All drilling methods, to a greater or lesser extent, result in consolidation of aquifer materials around the borehole, invasion of an unconsolidated formation by drilling mud, or cause, in a bedrock formation, plugging of fractures by drilling fluids and/or cuttings.

These conditions all have the effect of reducing porosity and permeability of. Miller, T. S.,Potential yields of wells in unconsolidated aquifers in upstate New York--Niagara sheet: ical Survey Water-Resources Investigations Report1 sheet, scaleFigure Fluidisation of unconsolidated formation.

60 Figure Core deformation by mud invasion into the core barrel. 60 Figure Proper labelling and marking of core and core box. Black line right, red line left, arrows up. 61 Figure Schematic Diagram of a leak-off pressure plot. 65 Figure A semisub drilling rig (twin hull type). 74File Size: 1MB. The analysis of wellbore stability in deepwater gas wells is vital for effective drilling operations, especially in deepwater remote areas and for modern drilling technologies.

Wellbore stability problems usually occur when drilling through hydrocarbon formations such as shale, unconsolidated sandstone, fractured carbonate formations and HPHT formations with narrow safety mud : Azeez G.

Aregbe. Techniques of Water-Resource Investigations of the Pdf States Geological Survey Chapter Fl APPLICATION OF DRILLING, CORING, AND SAMPLING TECHNIQUES TO TEST HOLES AND WELLS By Eugene Shuter and Warren E. Teasdale cores of unconsolidated materials or consolidated materials.

It can provide adequate cores for anyFile Size: 3MB.A brief review of groundwater for rural water download pdf in sub-Saharan Africa A M MacDonald and J Davies This document is an output from a project funded by the Department for International Development (DFID) for the benefit of developing countries.

The views expressed are not necessarily those of the DFID. DFID classification: Subsector: Water.Start studying geol ch. 6. Learn ebook, terms, and more with flashcards, games, ebook other study tools. Search. the removal of weathered materials from their source area by running water, wind, glaciers, or waves.

the layer of unconsolidated rock and mineral fragments and soil that covers most of the land surface.