skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Silica removal from steamflood produced water: South Texas Tar Sands Pilot

Abstract

Steamflood produced waters commonly contain suspended solids, oil, hardness, sulfide, and silica. Removal of these contaminants would make many of these waters suitable candidates for recycling as steam feedwater. Reuse of steamflood produced waters will increase steamer feedwater supplies, as well as reduce water disposal requirements. This paper describes a field pilot study of silica removal from steamflood produced water in the South Texas Tar Sands region. A hot-lime precipitation process was used to reduce dissolved silica concentrations from 400 mg/l to less than 50 mg/l SiO/sub 2/ in Mary R. Saner Ranch produced water. Most water systems using hot-lime precipitation for silica removal call for the addition of magnesium salts, as well as lime, to enhance silica removal. In this field study, however, magnesium salt addition did not improve silica removal efficiency. Hydrated lime ((Ca(OH)/sub 2/), alone, was sufficient to attain the desired silica residual, 50 mg/l SiO/sub 2/. The dissolved silica adsorbed onto the CaCO/sub 3/ crystals formed by lime reacting with the alkalinity present in the produced water. Required lime dosage was approximately 900 mg/lCa(OH)/sub 2/. Residual silica concentrations were found to be strongly related to both precipitator pH and calcium ion concentration. Therefore, on-line pH andmore » hardness monitoring may be used to estimate and control residual silica concentration. A 50,000-BPD (7,900 m/sup 3//d) produced water treating plant has been designed using results from this pilot study.« less

Authors:
; ;
Publication Date:
Research Org.:
Conoco Inc.
OSTI Identifier:
6125577
Report Number(s):
CONF-8409104-
Journal ID: CODEN: SEAPA
Resource Type:
Conference
Journal Name:
Soc. Pet. Eng. AIME, Pap.; (United States)
Additional Journal Information:
Journal Volume: SPE 13021; Conference: 59. annual Society of Petroleum Engineers of AIME technical conference, Houston, TX, USA, 16 Sep 1984
Country of Publication:
United States
Language:
English
Subject:
04 OIL SHALES AND TAR SANDS; OIL SANDS; STEAM INJECTION; WASTE WATER; PURIFICATION; RECYCLING; PRECIPITATION; REMOVAL; SILICA; TEXAS; THERMAL RECOVERY; WATER TREATMENT; BITUMINOUS MATERIALS; CARBONACEOUS MATERIALS; CHALCOGENIDES; ENERGY SOURCES; ENHANCED RECOVERY; FEDERAL REGION VI; FLUID INJECTION; FOSSIL FUELS; FUELS; HYDROGEN COMPOUNDS; LIQUID WASTES; MATERIALS; MINERALS; NORTH AMERICA; OXIDE MINERALS; OXIDES; OXYGEN COMPOUNDS; RECOVERY; SEPARATION PROCESSES; SILICON COMPOUNDS; SILICON OXIDES; USA; WASTES; WATER; 040401* - Oil Shales & Tar Sands- In Situ Methods, True & Modified

Citation Formats

Thomas, S A, Cathey, S R, and Yost, M E. Silica removal from steamflood produced water: South Texas Tar Sands Pilot. United States: N. p., 1984. Web.
Thomas, S A, Cathey, S R, & Yost, M E. Silica removal from steamflood produced water: South Texas Tar Sands Pilot. United States.
Thomas, S A, Cathey, S R, and Yost, M E. 1984. "Silica removal from steamflood produced water: South Texas Tar Sands Pilot". United States.
@article{osti_6125577,
title = {Silica removal from steamflood produced water: South Texas Tar Sands Pilot},
author = {Thomas, S A and Cathey, S R and Yost, M E},
abstractNote = {Steamflood produced waters commonly contain suspended solids, oil, hardness, sulfide, and silica. Removal of these contaminants would make many of these waters suitable candidates for recycling as steam feedwater. Reuse of steamflood produced waters will increase steamer feedwater supplies, as well as reduce water disposal requirements. This paper describes a field pilot study of silica removal from steamflood produced water in the South Texas Tar Sands region. A hot-lime precipitation process was used to reduce dissolved silica concentrations from 400 mg/l to less than 50 mg/l SiO/sub 2/ in Mary R. Saner Ranch produced water. Most water systems using hot-lime precipitation for silica removal call for the addition of magnesium salts, as well as lime, to enhance silica removal. In this field study, however, magnesium salt addition did not improve silica removal efficiency. Hydrated lime ((Ca(OH)/sub 2/), alone, was sufficient to attain the desired silica residual, 50 mg/l SiO/sub 2/. The dissolved silica adsorbed onto the CaCO/sub 3/ crystals formed by lime reacting with the alkalinity present in the produced water. Required lime dosage was approximately 900 mg/lCa(OH)/sub 2/. Residual silica concentrations were found to be strongly related to both precipitator pH and calcium ion concentration. Therefore, on-line pH and hardness monitoring may be used to estimate and control residual silica concentration. A 50,000-BPD (7,900 m/sup 3//d) produced water treating plant has been designed using results from this pilot study.},
doi = {},
url = {https://www.osti.gov/biblio/6125577}, journal = {Soc. Pet. Eng. AIME, Pap.; (United States)},
number = ,
volume = SPE 13021,
place = {United States},
year = {1984},
month = {9}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share: