Earthquakes near Rocky Mountain House, Alberta, and their relationship to gas production facilities

1986 ◽  
Vol 23 (2) ◽  
pp. 172-181 ◽  
Author(s):  
Robert J. Wetmiller
Keyword(s):  
Field Survey ◽  
Rocky Mountain ◽  
Gas Production ◽  
Earthquake Activity ◽  
Gas Reservoir ◽  
Regional Seismicity ◽  
Thrust Faulting ◽  
Northern United States ◽  
East West ◽  
Sour Gas

A 1980 field survey of earthquake activity near Rocky Mountain House, Alberta, using one digital and six conventional seismographs, recorded 146 microearthquakes (M ≤ 3.4) in 23 days and located 67 of them. The located events, and probably the unlocated events as well, all occurred in a small zone approximately 4 km north–south by 4 km east–west by 1 km thick, centred near 52°12.5′N, 115°15′W at a depth of 4.0 km, with an uncertainty of ±2 km on each of the location coordinates. The activity occurred below and (or) in the Strachan D-3A sour gas reservoir, which is a Devonian-aged limestone reef complex in a section of nearly flat-lying, unfaulted sediments. The earthquakes had a composite thrust-faulting mechanism with generally north-trending, intermediate-dipping planes in the presence of a regional deviatoric stress field that was horizontally compressive and oriented approximately east–west. The earthquake activity may be related to the extraction of the natural gas and related fluids from the reservoir, but the exact relationship cannot be documented at this time.The earthquake activity in the region increased dramatically after the production of gas from the reservoir began in the early 1970's. The tight cluster of activity found by the field survey suggests that all the activity in the region occurred in the same small zone but that earlier events may have been mislocated. Earthquake activity in western Alberta generally is not induced and occurs within a regional seismicity belt spatially continuous with the Intermountain Seismic Belt of the northern United States, but the earthquake activity in Canada seems to be tectonically distinct from that in the U.S.A., being characterized by thrust faulting and horizontally compressive stress.

scholarly journals Quantitative study on natural gas production risk of Carboniferous gas reservoir in eastern Sichuan

2021 ◽  
Author(s):  
Guo Yu ◽  
Haitao Li ◽  
Yanru Chen ◽  
Linqing Liu ◽  
Chenyu Wang ◽  
...  
Keyword(s):  
Risk Factors ◽  
Risk Factor ◽  
Natural Gas ◽  
Gas Production ◽  
Probability Method ◽  
Gas Reservoir ◽  
Production Risk ◽  
Probability Interval ◽  
Natural Gas Production ◽  
Stable Production

AbstractQuantifying natural gas production risk can help guide natural gas exploration and development in Carboniferous gas reservoirs. In this study, the Monte Carlo probability method is used to obtain the probability distribution and growth curve of each production risk factor and production in a Carboniferous gas reservoir in eastern Sichuan. In addition, the fuzzy comprehensive evaluation method is used to conduct the sensitivity analysis of the risk factors, and the natural gas production and realization probability under different risk factors are obtained. The research results show that: (1) the risk factor–production growth curve and probability distribution are calculated by the Monte Carlo probability method. The average annual production under the stable production stage under different realization probabilities is obtained. The maximum probability range of annual production is $$\left( {43.43 - 126.35} \right) \times 10^{8} {\text{m}}^{3} /{\text{year}}$$ 43.43 - 126.35 × 10 8 m 3 / year , and the probability range is 14.59–92.88%. (2) The risk factor sensitivity analysis is significantly affected by the probability interval. In the entire probability interval, the more sensitive risk factors are the average production of the kilometer-deep well (D) and the production rate in the stable production stage (A). During the exploration and development of natural gas, these two risk factors can be adjusted to increase production.

Effect of sulphur deposition on well performance in a sour gas reservoir

2017 ◽  
Vol 96 (4) ◽  
pp. 886-894 ◽  
Author(s):  
Jinghong Hu ◽  
Zhengdong Lei ◽  
Zhangxin Chen ◽  
Zhanguo Ma
Keyword(s):  
Well Performance ◽  
Gas Reservoir ◽  
Sulphur Deposition ◽  
Sour Gas

A Dynamic Workflow of Well Health Issue Prediction – Sulfur Deposition

2021 ◽  
Author(s):  
Bashirul Haq
Keyword(s):  
Material Balance ◽  
Gas Production ◽  
Health Issue ◽  
Sulfur Deposition ◽  
Gas Reservoirs ◽  
Gas Field ◽  
Actual Performance ◽  
Sulphur Deposition ◽  
Balance Analysis ◽  
Sour Gas

Abstract Sour gas reservoirs are vital sources for natural gas production. Sulphur deposition in the reservoir reduces a considerable amount of gas production due to permeability reduction. Consequently, well health monitoring and early prediction of Sulphur deposition are crucial for effective gas production from a sour gas reservoir. Dynamic gas material balance analysis is a useful technique in calculating gas initially in place utilizing the flowing wellhead or bottom hole pressures and rates during the well's lifetime. The approach did not apply to monitor a producing gas's health well and detect Sulphur deposition. This work aims to (i) modify dynamic gas material balance equation by adding the Sulphur deposition term, (ii) build a model to predict and validate the issue utilizing the modified equation. A unique form of the flowing material balance is developed by including Sulphur residue term. The curve fitting tool and modified flowing gas material balance are applied to predict well-expected behaviour. The variation between expected and actual performance indicates the health issue of a well. Initial, individual components of the model are tested. Then the model is validated with the known values. The workflow is applied to active gas field and correctly detected the health issue. The novel workflow can accurately predict Sulphur evidence. Besides,the workflow can notify the production engineers to take corrective measures about the subject. Keywords: Sulfur deposition, Dynamic gas material balance analysis, Workflow

A Volumetric Analysis of Almond Formation (Cretaceous, Mesaverde Group) Gas Production in the Coal Gulch-Echo Springs Standard Draw Field Complex, Washakie Basin, Southwest Wyoming

1998 ◽  
Vol 1 (04) ◽  
pp. 328-337
Author(s):  
D.N. Burch ◽  
R.M. Cluff
Keyword(s):  
Gas Flow ◽  
Rocky Mountain ◽  
Volumetric Analysis ◽  
Gas Production ◽  
Total Production ◽  
Total Contribution ◽  
Gas Leakage ◽  
Original Manuscript ◽  
Field Area ◽  
Mesaverde Group

This paper (SPE 50995) was revised for publication from paper SPE 38368, first presented at the 1997 SPE Rocky Mountain Regional Meeting, Casper, Wyoming, 18-21 May. Original manuscript received for review 18 June 1997. Revised manuscript received 27 April 1998. Paper peer approved 1 June 1998. Summary The Coal Gulch-Echo Springs-Standard Draw field complex is one of the largest commercial gas accumulations in the Rocky Mountain region with over 1 Tcf of gas of recoverable reserves. Gas is produced from both the Upper Almond barrier bar and shoreline sandstones at the top of the Mesaverde Group (Upper Cretaceous) and from underlying Main Almond fluvial and marginal marine sandstones. Some recently published models suggest that although the bulk of the produced gas in the fields is from the Upper Almond bar interval, simple volumetric calculations can only account for about 50% of the estimated ultimate recovery from this reservoir. These models imply that the depleting Upper Almond reservoir might be actively recharged by gas leakage from deeper Main Almond sandstones, with contributions from the deeper reservoirs of up to 10 to 30 Bcf of gas per well. This is in stark contrast to typical Main Almond-only producers outside the field area, which have mean reserves of less than 1 Bcf of gas and rarely produce more than 2 Bcf of gas per well. The implication is that the Upper Almond bar sand acts as a gas flow conduit, and its presence is required for efficient drainage of the Main Almond. We determined the gas in place (GIP) for all field wells drilled before 1993. The GIP within the Upper Almond reservoir only was determined by detailed openhole log analysis and volumetric mapping to be 1,050 Bcf of gas. Total reserves from all producing intervals (Upper Almond and Main Almond combined) are estimated by decline curve analysis to be 1,003 Bcf of gas. The Main Almond lenticular reservoirs contribution to total production is then assumed to be statistically similar to Main Almond-only producers outside the field area, giving an estimated total contribution from Main Almond completions of 96 Bcf of gas; therefore, the recovery factor from the Upper Almond alone is estimated to be (1003 - 96)/1050=86%. We conclude that field volumetrics do not support a disproportionate contribute of Main Almond gas to the total field production, nor does the volumetric analysis support the active reservoir recharge hypothesis. P. 328

scholarly journals Drill core from seismically active sandstone gas reservoir yields clues to internal deformation mechanisms

Geology ◽  
2020 ◽  
Author(s):  
Berend A. Verberne ◽  
Suzanne J.T. Hangx ◽  
Ronald P.J. Pijnenburg ◽  
Maartje F. Hamers ◽  
Martyn R. Drury ◽  
...  
Keyword(s):  
Microstructural Analysis ◽  
Gas Production ◽  
Drill Core ◽  
Gas Reservoir ◽  
Gas Field ◽  
Reservoir Compaction ◽  
Key Factor ◽  
Forecasting System ◽  
Internal Deformation ◽  
Dauphiné Twinning

Europe’s largest gas field, the Groningen field (the Netherlands), is widely known for induced subsidence and seismicity caused by gas pressure depletion and associated compaction of the sandstone reservoir. Whether compaction is elastic or partly inelastic, as implied by recent experiments, is a key factor in forecasting system behavior and seismic hazard. We sought evidence for inelastic deformation through comparative microstructural analysis of unique drill core recovered from the seismogenic center of the field in 2015, 50 yr after gas production started, versus core recovered before production (1965). Quartz grain fracturing, crack healing, and stress-induced Dauphiné twinning are equally developed in the 2015 and 1965 cores, with the only measurable effect of gas production being enhanced microcracking of sparse K-feldspar grains in the 2015 core. Interpreting these grains as strain markers, we suggest that reservoir compaction involves elastic strain plus inelastic compression of weak clay films within grain contacts.

Modeling of sulfur plugging in a sour gas reservoir

2013 ◽  
Vol 11 ◽  
pp. 18-22 ◽  
Author(s):  
Jinghong Hu ◽  
Shunli He ◽  
Jinzhou Zhao ◽  
Yongming Li
Keyword(s):  
Gas Reservoir ◽  
Sour Gas

Study on Supercritical Carbon Dioxide Fracturing Coalbed Gas Method

2013 ◽  
Vol 807-809 ◽  
pp. 2529-2533 ◽  
Author(s):  
Ying Xin Zhang ◽  
Peng Fei Wang ◽  
Jie Yang ◽  
Guang Qi Li
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Coal Seam ◽  
Gas Production ◽  
Reflection Effect ◽  
Gas Reservoir ◽  
Coalbed Gas ◽  
The Difference ◽  
Coal Reservoir ◽  
Supercritical Carbon

The difference between coal reservoir and conventional natural gas reservoir leads to difficulty for fracturing coal seam, also extremely low permeability in coal seam affects seriously the coalbed gas production. However, supercritical carbon dioxide has unique properties that promote pores and cracks, improve coal seam permeability and replace of CH4 in coal and rock seam. This paper researches on fracturing principle, generational capacity and carrying capacity, anti-reflection effect. At the sametime, based on the problem of change permeability in coal seam, the paper also analyes characteristics of coal reservoir and coalbed gas and combines with properties of supercritical carbon dioxide, which points out the feasibility and necessity that using supercritical carbon dioxide as fracturing carrier in coalbed gas exploitation realizes anti-reflection and increasing production.

Research and Application of Material Corrosion Prevention Technology in the Completed well System for Sour Gas well

2013 ◽  
Vol 712-715 ◽  
pp. 1096-1099
Author(s):  
Ling Feng Li
Keyword(s):  
Steel Corrosion ◽  
Gas Production ◽  
Corrosion Prevention ◽  
Gas Reservoirs ◽  
Gas Field ◽  
Gas Well ◽  
Corrosion Resistant Alloy ◽  
System Life ◽  
Sour Gas

For natural gas well in sour gas reservoirs, very serious corrosion in the completed well system is an important factor of gas production system life. In order to ensure the long-term development of gas wells, this paper mainly introduces material corrosion prevention technology in the completed well system, such as corrosion-resistant alloy steel corrosion control technology, bimetallic combination tubing, corrosion inhibitor technology and so on. By taking LJ Gas Field as an example, this paper introduces the material corrosion prevention technology in the completed well system in LJ Gas Field. For application in the completed well system in LJ Gas Field, the technology above have good performance of corrosion resistance.

Research on Tubing and Casing Corrosion in Sour Gas Reservoirs and Corrosion-Resistant Material Selection

2013 ◽  
Vol 690-693 ◽  
pp. 1516-1519
Author(s):  
Ling Feng Li
Keyword(s):  
Material Selection ◽  
Gas Production ◽  
Resistant Material ◽  
Gas Reservoirs ◽  
Gas Well ◽  
Corrosion Resistant ◽  
System Life ◽  
Sour Gas ◽  
Selection Of

For natural gas well in sour gas reservoirs, very serious corrosion in the gas well string is an important factor of gas production system life. In order to ensure the long-term development of gas wells, this paper mainly introduces the tubing and casing corrosion in sour gas reservoirs, corrosion-resistant material selection of tubing and casing in sour gas reservoirs and proposes the optimization idea and technique of tubing material selection.. By taking W 63 well as an example, this paper optimizes the material selection of production casing for W 63 well. For application, the optimal materials of gas well string in W 63 well have good performance of corrosion resistance.

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