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Wellbore instability, experienced mainly in shale sections, may be induced by ei- ther in-situ stresses that are high relative to the strength of ft formations (stress-in- duced) or physico-chemical interactions of the drilling fluid with the shale or a combination of both. This paper de- scribes an efficient, 'keep it simple' ap-.
Advanced Wellbore Stability Model (WELLSTAB-PLUS) Dr. William C. Maurer TP00-09 1 DEA-139 Phase I DEA Sponsor: D
Shales account for 75% of the formations drilled worldwide, while drilling troubles associated with shale represents 90% of wellbore stability problems reported. In this paper, a traditional wellbore stability study has been implemented at an onshore gas field in a tectonically active region. Despite following the program
Utilization of a comprehensive approach to wellbore stability requires knowledge of rock strength, pore pressure and the magnitude and orientation of the three principal stresses. These parameters are often uncertain making confidence in deterministic predictions of the risks associated with instabilities during drilling and
Objectives. 1. To describe causes of wellbore instability problems. 2. To describe wellbore stability before, during, and after drilling wells. 3. To describe symptoms of the problems while drilling. 4. To discuss practical, preventive, and remedial actions for wellbore instability. 10
Wellbore stability is of critical importance in the success of drilling operations. One of the main goals of any drilling mission is to drill the well as cost-effective as possible. Wellbore instability can be detrimental to this goal. Therefore, wellbore stability analysis has been included in well planning stage of many companies.
18 Jun 2013 dx.doi.org/10.1155/2013/720271. Research Article. Wellbore Stability in Oil and Gas Drilling with. Chemical-Mechanical Coupling. Chuanliang Yan,1,2 Jingen Deng,1 and Baohua Yu1. 1 State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249,
up the wellbore. > Comprehensive lost circulation management program. The bottom three tiers of the pyramid focus on lost circulation prevention. Best drilling practices . to do so causes the wellbore's physical stability to change along a continuum of . dl/docs/2010/FredGrowcock.pdf (accessed. September 21, 2011). 8.
DRILLING CONDITIONS AT BEGINING OF 2000's. VERTICAL WELL DEPTH > 6000m (SCIENTIFIC BOREHOLES 8000-12000m). HORIZONTAL WELL : OFFSETs > 12 kms. TEMPERATURE > 200°C (350-500°C contemplated for geothermal). PORE PRESSURE : 2 to 2,5 times HYDROSTATIC. 115 MPa at 5200m ELGIN
Features incorporated into PSI. The PSI model takes into account a rich amount of rock and fluid properties affecting wellbore stability over time. Some general features it can handle are anisotropic formation stresses, arbitrary well orientation and various types of drilling mud (OBM/WBM/SOBM). More specifically, the model
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