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Method for predicting carbonate formation pore pressure by using log information

A technology of formation pore pressure and carbonate rock, used in surveying, earthmoving, wellbore/well components, etc., can solve lost circulation, difficult to find explanatory models, and exacerbate the complexity of carbonate rock deposition process, etc. question

Inactive Publication Date: 2011-02-02
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

Carbonate strata have a complex pore space structure, such as cracks and pores, and its anisotropy, heterogeneity and other factors aggravate the complexity of the carbonate rock deposition process, resulting in the inability to accurately determine the carbonate Because of the formation mechanism of abnormal pore high pressure in rock formations, it is difficult to find a reasonable explanation model
Drilling in carbonate formations, due to the difficulty in predicting abnormal pressure, often leads to downhole complex accidents such as well wall collapse, lost circulation, and even blowout

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  • Method for predicting carbonate formation pore pressure by using log information
  • Method for predicting carbonate formation pore pressure by using log information
  • Method for predicting carbonate formation pore pressure by using log information

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Embodiment Construction

[0028] Specific examples of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0029] According to the effective stress theorem, the pressure of the overlying strata is jointly borne by the skeleton stress and the pore fluid pressure, and the porosity of the rock decreases with the increase of the total stress (overlying strata pressure) during normal drainage and consolidation. The deposition mechanism of carbonate formations is different from that of clastic formations. According to the theory of elastic wave propagation, sound waves must pass through the rock skeleton and pore fluid when propagating in the formation. The sound velocity can reflect the composition of the rock skeleton and pore fluid. Effective stress, bulk modulus, pore fluid density, formation pore pressure, pore fluid temperature and other factors are related. Therefore, the pore pressure of carbonate rock formations can be predicted by using t...

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Abstract

The invention discloses a method for predicting carbonate formation pore pressure by using log information. The method for predicting the carbonate formation pore pressure by using the log information is based on the effective stress theorem; and by establishing a framework longitudinal wave velocity and pore fluid longitudinal wave velocity equation, a carbonate formation pore pressure equation is established, so that the carbonate formation pore pressure is detected according to the measured log information, scientific evidences are provided for determining safety drilling fluid density during drilling design, and carbonate formation underground complex accidents in the construction process are effectively prevented.

Description

technical field [0001] The invention relates to a method for predicting the pore pressure of carbonate rock formations by using well logging data, more specifically, it relates to a method based on the effective stress theorem, considering the longitudinal wave velocity of the skeleton and pore fluid, and using the well logging data to predict carbonate method of pore pressure in rock formations. Background technique [0002] There is a large amount of undeveloped oil and gas in the carbonate strata of ancient buried hills, which is a new exploration area for stable oil production in the future. Carbonate rocks are widely distributed. Dagang, Tarim, Jianghan, Sichuan, Shengli, Zhongyuan, North China, Xinjiang, Qinghai, Changqing and other oilfields are developing carbonate rock reservoirs. Carbonate strata have a complex pore space structure, such as cracks and pores, and its anisotropy, heterogeneity and other factors aggravate the complexity of the carbonate rock depositi...

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Application Information

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IPC IPC(8): E21B49/00E21B47/14
Inventor 金衍陈勉余夫侯冰卢运虎
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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