محاسبه پارامترهاي ژئومكانيكي پايداري ديواره چاه با استفاده از داده‌هاي پتروفيزيكي در يكي از ميادين نفتي جنوب خليج فارس

Calculation of geomechanical parameters and wellbore stability using petrophysical in one of the oilfield, southern Persian Gulf

ژﺋﻮﻣﮑﺎﻧﯿﮏ ﻣﺨﺎزن ﻫﯿﺪروﮐﺮﺑﻨﯽ، ﻧﻘﺶ ﻣﻬﻢ و ﻓﺰاﯾﻨﺪه اي در ارزﯾﺎﺑﯽ و ﺗﻮﺳﻌﻪ ﻣﯿﺎدﯾﻦ ﻧﻔﺖ و ﮔﺎز اﯾﻔﺎ ﻣﯽﮐﻨﺪ. ﯾﮑﯽ از ﻣﺴﺎﺋﻞ ﻣﻬﻢ در اﯾﻦ زﻣﯿﻨﻪ ﺗﺤﻠﯿﻞ ﭘﺎﯾـﺪاري ﭼـﺎه ﻫـﺎي ﻧﻔﺖ ﻣﯽ ﺑﺎﺷﺪ. ﺑﺎ ﺗﻮﺟﻪ ﺑﻪ اﻗﺘﺼﺎدي ﺑﻮدن ﻣﻮﺿﻮع ﺗﻌﯿﯿﻦ ﻓﺸﺎر ﮔﻞ ﺟﻬﺖ ﭘﺎﯾﺪاري ﭼﺎه ﺑﺎﯾﺪ ﺑﺎ دﻗﺖ اﻧﺠﺎم ﮔﯿﺮد. ﻣﻘﺪار و ﺟﻬﺖ ﺗﻨﺶ ﻫﺎي اﺻﻠﯽ، ﺧﺼﻮﺻـﯿﺎت ﻣﮑـﺎﻧﯿﮑﯽ ﺑـﻪ ﻫﻤـﺮاه ﻓﺸﺎر ﻣﻨﻔﺬي ﭘﺎراﻣﺘﺮﻫﺎي ﻣﻮرد ﻧﯿﺎز ورودي ﺗﺤﻠﯿﻞ ﻣﯽ ﺑﺎﺷﺪ. ﺑﺎ اﻧﺘﺨﺎب ﻣﻌﯿﺎر ﺷﮑﺴﺖ ﻣﻨﺎﺳﺐ ﻣﯽ ﺗﻮان ﺗﺤﻠﯿﻞ ﻫﺎ را ﺑﺎ دﻗﺖ ﻣﻨﺎﺳﺐ اﻧﺠﺎم داد. ﻫﺪف از اﯾﻦ ﻣﻘﺎﻟﻪ ﺗﺤﻠﯿـﻞ ﭘﺎﯾـﺪاري ﯾﮑﯽ از ﻣﯿﺎدﯾﻦ ﺟﻨﻮب ﮐﺸﻮر ﻣﯽ ﺑﺎﺷﺪ. ﺑﻪ ﻣﻨﻈﻮر اﻧﺠﺎم اﯾﻦ ﺑﺮرﺳﯽ، 4 ﻧﻘﻄﻪ ﺑﺤﺮاﻧﯽ اﻧﺘﺨﺎب و ﺗﺤﻠﯿﻞ ﻫﺎ ﺑﺎ اﺳﺘﻔﺎده از ﻣﻌﯿﺎر ﺷﮑﺴﺖ ﻣﻮﻫﺮ- ﮐﻠﻤﺐ و در ﻣﺤﯿﻂ ﻧـﺮم اﻓـﺰاي ﻣﺘﻠـﺐ ﺻﻮرت ﭘﺬﯾﺮﻓﺘﻪ اﺳﺖ. ﺑﺎ ﺗﻮﺟﻪ ﺑﻪ ﻣﺸﺨﺺ ﺑﻮدن ﭘﺎراﻣﺘﺮﻫﺎي ورودي ﺑﺮرﺳﯽ ﭘﺎﯾﺪاري در ﺷﯿﺐ و آزﯾﻤﻮت ﻫﺎي ﻣﺨﺘﻠﻒ ارزﯾﺎﺑﯽ ﺷﺪه اﺳﺖ. ﭘﻨﺠﺮه ﮔﻞ ارزﯾﺎﺑﯽ ﺷـﺪه ﺑـﺮاي ﻧﻘـﺎط 1 ﺗﺎ 4 ﺑﻪ ﺗﺮﺗﯿﺐ ﺑﺮاﺑﺮ 27 ﺗﺎ 29 ،36/5 ﺗﺎ 39/5 ، 41 ﺗﺎ 55 و 47/5 ﺗﺎ 55 ﻣﺤﺎﺳﺒﻪ ﺷﺪه اﺳﺖ. در اداﻣﻪ ﺣﺪاﮐﺜﺮ وﺣﺪاﻗﻞ ﭼﮕﺎﻟﯽ ﮔﻞ ﺣﻔﺎري ﻧﯿﺰ ﻣﺤﺎﺳـﺒﻪ ﮔﺮدﯾـﺪ. ﻫﻤﭽﻨـﯿﻦ در انتهاي ﻣﻘﺎﻟﻪ ﮔﺴﯿﺨﺘﮕﯽ ﻫﺎي ﻣﻤﮑﻦ در ﺷﯿﺐ و آزﯾﻤﻮت ﻫﺎي ﻣﺨﺘﻠﻒ ارزﯾﺎﺑﯽ ﺷﺪه و ﺗﻌﺪادي از آن ﻫﺎ ﮔﺰارش ﺷﺪه اﺳﺖ

Geomechanical hydrocarbon reservoirs are important in oil and gas fields' development. Also one of the most important issues is Oil wells stability. Considering being economical this Issue, Determine mud Pressure for well stability is important. The amount and direction of the main tensions, Mechanical properties with pore pressure are input necessary parameters for study. By choosing stubble failure criteria can doing analysis with Fine precision. This study is about how to determine stress around wellbore and how to measure safe mud weight window at every Slope and Azimuth for well in oilfield in south of Persian Gulf by geomechanical method. For this study, then we chose 4 different depth for typical sampling and calculated bottom hole pressure, direct and azimuth of well that well be stable by using Mohr-Colomb criteria. By identifying the input data, different direct and azimuth of well is calculated. Mud window for 4 different depth respectively is 27-36.5 & 29-39.5 & 41-55 & 47.5-55. In continue maximum and minimum mud drilling density is calculated. In the end Obtained ruptures in different direct and azimuth and some of them have been reported.