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Stratum pressure recognition method by abnormal fluid immersing into well bore

A technology of formation pressure and identification method, applied in the field of oil drilling in oil fields

Active Publication Date: 2006-05-03
DAQING PETROLEUM ADMINISTRATION +1
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Problems solved by technology

[0007] In order to overcome the lack of a general method that can be applied to accurately identify the formation pressure under different geological conditions in the existing oil drilling and completion pressure detection technology, so as to accurately identify various rock formations, the present invention provides a method for immersion through abnormal fluid An identification method for wellbore to obtain formation pressure. After the application of this identification method, it has the characteristics of effectively identifying high-pressure layers that cannot be identified in existing technologies.

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  • Stratum pressure recognition method by abnormal fluid immersing into well bore

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with accompanying drawing:

[0034] At first set forth the conceived process that the inventor creates this method:

[0035] Fluid logging itself measures changes in mud resistivity within the wellbore. When the formation fluid is immersed, it will appear as a local anomaly on the fluid logging curve, and this local anomaly change is relative. If the abnormal change of the fluid curve is used to determine the immersion property, immersion amount and formation pressure of the fluid, the factors affecting the fluid curve must be determined first.

[0036] In the absence of formation fluid immersion, the change of mud resistance in the wellbore is mainly affected by the resistivity of the mud itself and the geothermal gradient. Conduct two indoor experiments.

[0037] Experiment 1, the relationship between mud resistivity and temperature. Through our measurements, we found that the electrical conducti...

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Abstract

The invention discloses an identification method of stratigraphic pressure through abnormal fluid into the wellbore in the oil field drilled pressure detection technique domain, which is characterized by the following: adapting the morphological variation of fluid well detection curve to affirm the fluid immersed well segment and fluid leaching high pressure layer position; explaining the high pressure layer pressure with liquid density.

Description

Technical field: [0001] The invention relates to a well completion pressure detection technology in the field of oil drilling in oil fields, in particular to a recognition technology for obtaining formation pressure by immersing abnormal fluid into a wellbore. Background technique: [0002] In the existing oil drilling and completion pressure detection technology, there are usually the following methods for identifying the formation pressure, but all of them have limitations, which are described as follows: [0003] The first is the field observation drilling display method. With this method, when drilling into a high-pressure layer with a high formation coefficient, it is easy to judge that the pressure of the layer is higher than the pressure of the drilling fluid column through the phenomenon of drilling fluid density and viscosity reduction, oil foam bubbles, etc., so that the layer can be accurately obtained. formation pressure. However, this method is difficult to ap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B47/06
Inventor 邹野郭军何礼君王广仁宗欣
Owner DAQING PETROLEUM ADMINISTRATION