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Anhydrite

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Journal Articles
Journal: SPE Journal
SPE J. 26 (03): 1144–1160.
Paper Number: SPE-203840-PA
Published: 16 June 2021
...Mohamed Mahmoud; Muhammad Shahzad Kamal; Murtada Saleh Aljawad; Abdulwahab Ali; Ayman Al-Nakhli Summary Calcium sulfate (anhydrite) exists in most of the carbonate reservoirs, and its content can reach more than 20%. The high content of anhydrite affects the efficiency of the acidizing process...
Proceedings Papers

Paper presented at the SPE International Conference and Exhibition on Formation Damage Control, February 19–21, 2020
Paper Number: SPE-199304-MS
.... Certainly, other examples of scale dissolvers can be found in the literature; this reference is one of the earliest examples that provides a fundamentally rational description of CaSO 4 dissolver blends. Table 1 Table of mass of anhydrite sample to volume of dissolver ratio used. Mass (g...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0519
... ABSTRACT: Induced earthquakes due to gas production have taken place in the province of Groningen in the northeast of the Netherlands since1986. Anhydrite layers or stringers are located in the Zechstein salt above the Groningen field. Recent high resolution studies have shown that a few...
Proceedings Papers

Paper presented at the International Petroleum Technology Conference, March 26–28, 2019
Paper Number: IPTC-19133-MS
... Abstract Many mechanisms have been proposed for low salinity waterflooding enhanced oil recovery (EOR) in carbonate rocks over the last decade, and they are still in debate. One suggested mechanism is the dissolution of anhydrite (CaSO 4 ) mineral from a rock material, which generates sulfate...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-999
... anhydrite rock specimens in the laboratory at varied confining stress conditions and observed these fractures with X-ray imaging. Anhydrite was acquired from the Big Sky Carbon Sequestration Partnership in Montana. These experiments provide a means to evaluate the potential for hydraulically conductive...
Proceedings Papers

Paper presented at the Abu Dhabi International Petroleum Exhibition & Conference, November 13–16, 2017
Paper Number: SPE-188566-MS
... a vertical profile; however, during the last two years; the majority of drilling wells in Burgan use a directional profile. The primary lithological description of the 16-in. section includes carbonates, anhydrite, and shale ( Fig. 2 ). The section begins with the Dammam formation, which primarily...
Proceedings Papers

Paper presented at the SPE Russian Petroleum Technology Conference, October 16–18, 2017
Paper Number: SPE-187723-MS
... Challenge Upgrade compressive strength multiple well Burgan Field dull condition shale application operator bit design durability footage interbedded anhydrite bearing average footage kuwait carbonate formation development well well type vertical well drill bit drive system society...
Proceedings Papers

Paper presented at the SPE International Conference on Oilfield Chemistry, April 3–5, 2017
Paper Number: SPE-184525-MS
... allows the solid inhibitor product to be completely compatible with the fracturing fluid. Scale modelling indicates that the wells treated have a severe anhydrite scale problem under downhole conditions. The results of comprehensive laboratory testing show the new solid inhibitor can prevent anhydrite...
Proceedings Papers

Paper presented at the Abu Dhabi International Petroleum Exhibition & Conference, November 7–10, 2016
Paper Number: SPE-182975-MS
... Abstract The Lower Fars formation located at the depths of 1350-1950meters, it mainly consists of alterations of claystone, anhydrite and salt layer with a 2.22 g/cm 3 high pressure aquifer in 1400~1600m, the safe drilling window is limited to 0.15g/cm 3 ,the 10~15m interval under...
Journal Articles
OIJ 2016 (07): 72–74.
Paper Number: OIJ-2016-07-072-074-RU
Published: 01 July 2016
... in sandstones associate with the uneven distribution of the thin layers of clay with thickness from several millimeters to 20–30 cm. Secondary texture are formed by postsedimentary epigenetic processes and expressed spotted inclusions of carbonate-anhydrite material in sand and silt rock matrix. An algorithm...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-071
... Abstract: Large carbonate or anhydrite inclusions are embedded in many salt bodies (so-called rafts, floaters or stringers) and these respond to the movements of the salt in a variety of ways, including displacement, folding and fracturing. The movement and deformation of those embedded...
Journal Articles
OIJ 2016 (05): 21–23.
Paper Number: OIJ-2016-05-021-023-RU
Published: 01 May 2016
...E. U. Ilina The pdf file of this paper is in Russian. The article describes some of the features of terrigenous complex of Eastern Siberia. The process of digitization of the core image for determination of the quantity of carbonate-anhydrite impurities in the rock is described. The version...
Proceedings Papers

Paper presented at the International Petroleum Technology Conference, December 6–9, 2015
Paper Number: IPTC-18369-MS
... out, the facies within bed changes markedly at a scale of <200 meters. For subsurface applications, this could be significant if the change in facies correlates with a change in petrophysical properties. The anhydrite layers at Brightling Mine are mostly composed of nodular, sabkha-type layers...
Proceedings Papers

Paper presented at the SPE Oil & Gas India Conference and Exhibition, November 24–26, 2015
Paper Number: SPE-178129-MS
...+ ions form anhydrite fines with the available SO 4 2- ions. The salinity and composition of brines present in pore space shows direct correlation with the amount of fines produced during CO 2 injection. With increase in temperature and pressure, the amount fines formation increased significantly...
Proceedings Papers

Paper presented at the SPE/IATMI Asia Pacific Oil & Gas Conference and Exhibition, October 20–22, 2015
Paper Number: SPE-176203-MS
... Abstract High-pressure and salt /anhydrite rocks at 1340-1950m Lower Fars formation present a lot of challenges in 244.5mm casing cementing in Halfaya oilfield due to existing the alternations of salt and anhydrite and clay, high pressure, high salinity(160000~220000ppm), low static temperature...
Proceedings Papers

Paper presented at the SPE Improved Oil Recovery Symposium, April 12–16, 2014
Paper Number: SPE-169065-MS
... at the end of the experiment. Experiment D4 was similarly performed with 3 wt% NaBO 2 in 8 wt% brine at 0.9 ft/d in a sandstone core containing gypsum at 55 °C. The effluent pH and the pressure drop across the core were monitored. Abstract The presence of gypsum or anhydrite in oil reservoirs limits...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-619
... ABSTRACT: Anhydritic claystones are among the most problematic rocks for tunneling. Their swelling has led to serious damage and high repair costs in a number of tunnels. One cause of the swelling process is undoubtedly the formation of gypsum. Anhydrite dissolves into calcium and sulphate...
Proceedings Papers

Paper presented at the SPE International Symposium on Oilfield Chemistry, April 11–13, 2011
Paper Number: SPE-141420-MS
... Abstract Alkali in surfactant flooding can sequester divalent ions and reduce surfactant adsorption. When the alkali is sodium carbonate and anhydrite (or gypsum) is present, the anhydrite will dissolve and precipitate as calcium carbonate. An anhydrite level of only 0.1% in the rock is enough...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2010, June 15–18, 2010
Paper Number: ISRM-EUROCK-2010-075
... ABSTRACT: Understanding the potential influence of brittle failure on swelling processes is motivated by the remarkable short and long-term heaving problems associated with tunnels constructed in anhydrite rich rock types (Gipskeuper) in Switzerland and elsewhere. Brittle failure behavior...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2010, June 15–18, 2010
Paper Number: ISRM-EUROCK-2010-076
... of exceeding strain and deformation in areas of swelling rocks. The following article presents a new approach to the understanding of considerable swelling and deformation in rocks containing sulphate of the "Gipskeuper" formation. In doing so it is focused on the small rock zone of the anhydrite surface...

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