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Method for detecting pore pressure of high pressure saltwater layer by using log information

A technology of pore pressure and logging data, which is applied in the field of detecting pore pressure of high-pressure saline layer by using logging data based on trend surface theory, can solve problems such as difficulty in abnormal pressure prediction, drilling fluid contamination, well overflow, etc., to prevent brine The effect of multi-layer downhole complex and other malignant accidents

Inactive Publication Date: 2011-01-05
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

Drilling in high-pressure saline layers often pollutes the drilling fluid and deteriorates the stability of the wellbore. Due to the difficulty in predicting abnormal pressure, the overflow of brine often causes serious accidents such as overflow in the well, vomiting and diarrhea, and even blowout and scrapping of the wellbore.

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  • Method for detecting pore pressure of high pressure saltwater layer by using log information
  • Method for detecting pore pressure of high pressure saltwater layer by using log information
  • Method for detecting pore pressure of high pressure saltwater layer by using log information

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Embodiment Construction

[0029] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0030] According to Terzaghi's effective stress principle, the overlying pressure on rock is jointly borne by the skeleton stress and pore water pressure, and the porosity of rock decreases with the increase of total stress (overlying strata pressure) during normal drainage and consolidation. If the formation is undercompacted or not fully consolidated with drainage, the pore water pressure of the formation exceeds the normal depositional state. Based on this, it can be seen that there is a correlation between rock pore water pressure, porosity, and overlying strata pressure. According to the theory of elastic wave propagation, sound waves propagate at different speeds in the rock skeleton and pore water, and the sound velocity can reflect the composition of the rock skeleton and pores. The natural potential curve records the natu...

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Abstract

The invention discloses a method for detecting the pore pressure of a high pressure saltwater layer by using log information. In the method, the pore pressure of the high pressure saltwater layer is detected according to measured log information through a relational curve between sedimentary characteristic-based interval transit time, spontaneous potential and natural gamma log response characteristic and the pore pressure of the high pressure saltwater layer, so that scientific basis is provided for determining the density of safe drilling liquid during well design, and occurrence of complexand other terrible accidents in underground of the saltwater layer during the construction can be effectively prevented.

Description

technical field [0001] The invention relates to a method for detecting the pore pressure of a high-pressure saline layer by using logging data, more specifically, a method for detecting the pore pressure of a high-pressure saline layer based on the trend surface theory by using logging data. Background technique [0002] In the process of drilling oil wells, especially deep wells and ultra-deep wells, salt (gypsum) layers are often encountered. The salt (gypsum) layers discovered by drilling in mainland China are widely distributed, such as Tarim, Jianghan, Sichuan, Shengli, Central Plains, North China, Xinjiang, Qinghai, Changqing and other oilfields have experienced vicious accidents such as pipe sticking, casing collapse, severe overflow, and even oil well scrapping when drilling into salt (gypsum) layers. Salt (gypsum) layers generally belong to lagoon continental deposits and coastal deposits. The water layer developed between salts often has the characteristics of high...

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Application Information

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IPC IPC(8): E21B47/06E21B47/14E21B49/00
Inventor 金衍陈勉李庆辉卢运虎梁红军李宁
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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