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Prediction Method of Formation Pressure for Carbonate in Longgang Sour Gas Field

Author: LiLei
Tutor: ChengYuanFang
School: China University of Petroleum
Course: Oil and Gas Well Engineering
Keywords: Carbonate Fracture prediction Pore ??pressure Collapse pressure Burst pressure
CLC: P578.6
Type: Master's thesis
Year: 2011
Downloads: 105
Quote: 0
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Abstract


China's Sichuan Basin contains abundant natural gas resources, is an important natural gas producing areas for drilling wells of this region has the characteristics of high-pressure, high-yield, high-sulfur, has brought a lot of risk and safety issues. The primary key issue is to reduce the three-high gas field drilling risk to be able to accurately predict the three strata pressure profile, and then follow this profile the exploratory wells engineering design, and in strict accordance with this profile to determine the structure of the wellbore and drilling fluid density tissue production. Carbonate strata pressure profile prediction difficulty is how to create a pore pressure prediction methods for carbonate formations. Carbonate rocks chemical sedimentary rocks, there is no law of normal compaction basic traditional pore pressure prediction method based on undercompaction theory does not apply to the carbonate strata. The study employed a combination of theoretical analysis and indoor sonic experiments. Summarize predecessors on the basis of the genetic mechanism of abnormal formation pressure, combined with the lithological characteristics of carbonate, limestone indoor sonic experiments to simulate the stress state of the limestone in the ground, under conditions of constant porosity the changes in the relationship between the wave velocity and effective stress, and the same conditions of effective stress between wave velocity and porosity changes. Regression analysis on the basis of a large number of experimental data, the application of the principle of effective stress, and the establishment of a new model of a carbonate formation pore pressure prediction. Study the the log response mechanism of the different systems of the of carbonate formation fractures causes and cracks, holes, porosity, etc., dual laterolog method better able to identify the fracture system, and screened to determine the difference between deep and shallow resistivity fracture occurrence and fracture porosity and open the fracture parameters calculated based on the quantitative estimation model analysis study block fracture development. From the wellbore stability mechanism of rock mechanics, analysis of the the borehole wall surrounding rock stress state, considering the effect of the crack, and Coulomb-Mohr strength criterion and the maximum tensile stress rupture criteria given carbonate stratigraphic borehole wall collapse pressure and fracture pressure equivalent to the formula of the drilling fluid density. Three high gas field drilling geological risk prediction software based on Visual Basic 6.0 programming language, written using the software field applications of the Longgang x in Longgang experimental block well and Longgang xx well, two wells strata pressure prediction profiles. The application results show that the carbonate formation pressure prediction model established in this paper is feasible, and compared with the traditional formation pressure prediction method is more applicable in carbonate strata predicted results more accurate and scientific.

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CLC: > Astronomy,Earth Sciences > Geology > Mineralogy > Mineral classification > Carbonate
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