Determination of magnitude and orientation of the in-situ stress from borehole breakout and effect of pore pressure on borehole stability — Case study in Cheshmeh Khush oil field of Iran

Yaghoubi, Ali; Zeinali, M.

doi:10.1016/j.petrol.2009.05.008

Cited by 48 publications

(17 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2019, 9, 5033 4 of 16 (8) Young's modulus. Young's modulus represents the degree of deformation caused by stress, which can better reflect the stress-strain characteristics of rock [40]. Young's modulus is positively correlated with crack height and negatively correlated with crack length and crack width.…”

Section: Index System Constructionmentioning

confidence: 99%

Gray Relational Analysis Optimization for Coalbed Methane Blocks in Complex Conditions Based on a Best Worst and Entropy Method

et al. 2019

View full text Add to dashboard Cite

The uncertainty and complexity of the geological parameters of coalbed methane (CBM) reservoirs may result in the assignment of atypical exact values to a whole block. Therefore, the influence of different resources and productivity characterization indices on the development of CBM blocks was analyzed systematically in this research. Furthermore, this research reported an interval-number index evaluation system and a gray relational analysis optimization model for CBM development. The weights of the evaluation indices were determined by combining the entropy method and the best worst method (BWM) with the objective deviation law of the data and the subjective experience of experts. Based on the gray system theory, a multi-index gray relational analysis optimization model was established to evaluate the interval values and optimize the development potential of CBM blocks with complex geological conditions. The results show that the order of importance of the eight resources and reservoir evaluation indices, from highest to lowest, is permeability, reservoir pressure gradient, gas content, reservoir thickness, reservoir depth, critical reservoir ratio, Young's modulus, and reservoir temperature. The order of the target blocks, from most to least optimal, is the Sanjiao block, Fanzhuang-Zhengzhuang block, Daning-Jixian block, Gujiao block, and Fengrun block. The evaluation results are consistent with actual conditions. Thus, the multi-index gray relation analysis optimization model, on account of the gray system theory, is feasible for the development evaluation of CBM blocks under complex conditions. This model is suitable for the CBM blocks in the range of 547 km 2~6 75 km 2 . When using this model, the index values must be representative and accurate.

show abstract

Section: Index System Constructionmentioning

confidence: 99%

Gray Relational Analysis Optimization for Coalbed Methane Blocks in Complex Conditions Based on a Best Worst and Entropy Method

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Many problems, such as borehole breakouts, collapse, losses of borehole and increased drilling time, are associated with inaccurate wellbore stability analysis [4]. The signs of stress concentration around the borehole are distinguished by compressive and tensile-induced failure which can occur at both sides of the borehole wall where stress concentration has exceeded the strength of the rock [5].…”

Section: Introductionmentioning

confidence: 99%

“…Image log is widely used for interpretation of axial tensile-induced and compressive (breakout) failures which are reliable indicators of the minimum and maximum horizontal in situ stress orientation, respectively. The mechanical instabilities in the borehole during the drilling can be reduced or mitigated by choosing the optimal mud weight and optimal well bore trajectory [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Identification of stress regimes by using 1D geomechanical modeling of clastic and carbonate reservoirs

Satti

Chen

2020

SN Appl. Sci.

View full text Add to dashboard Cite

“…Yet, the 2008 World Stress Map database contains very little present-day stress information for Iran and no stress data from petroleum wells [23]. Yaghoubi and Zeinali [24] investigated a detailed profile of the stress orientation in two wells in the Cheshmeh Khush oilfield in SW of Iran. Later, Rajabi et al [25] examined resistivity image logs and determined the presentday stress orientation of the Abadan Plain in SW Iran.…”

Section: Introductionmentioning

confidence: 99%

New Analytical Approach for Reservoir Stress Approximation Based on Acid Fracturing Data

Haghi¹,

Asef²,

Kharrat³

2015

jeg

View full text Add to dashboard Cite

In this research attempts were made to estimate the in-situ stresses acting on a hydrocarbon reservoir based on routine activities of acid injection in oil reservoir. It was found that the relation between the reopening pressure of fracture and principal in-situ stresses can be estimated using rock mechanics equations for the circular underground cavities. An appropriate relation between the maximum and minimum horizontal principal in-situ stresses and reservoir parameters such as permeability, reservoir pressure, Young's modulus, acid viscosity, injection flow rate and etc., was developed by using the well-known Darcy equations for fluid flow in porous media. Accordingly, knowing the flow rate of acid injection during well operations and some other reservoir parameters, in-situ stresses may be estimated. The method was then successfully applied to a large carbonate reservoir as a case study in south-west of Iran. Maximum and minimum effective horizontal stresses were calculated by employing the presented method.

show abstract

Determination of magnitude and orientation of the in-situ stress from borehole breakout and effect of pore pressure on borehole stability — Case study in Cheshmeh Khush oil field of Iran

Cited by 48 publications

References 29 publications

Gray Relational Analysis Optimization for Coalbed Methane Blocks in Complex Conditions Based on a Best Worst and Entropy Method

Gray Relational Analysis Optimization for Coalbed Methane Blocks in Complex Conditions Based on a Best Worst and Entropy Method

Identification of stress regimes by using 1D geomechanical modeling of clastic and carbonate reservoirs

New Analytical Approach for Reservoir Stress Approximation Based on Acid Fracturing Data

Contact Info

Product

Resources

About