Highly-deviated/horizontal well resistivity correction method based on rock physical experiment
A petrophysics, correction method technology, applied in wellbore/well components, earthwork drilling, design optimization/simulation, etc., to achieve improved capabilities, accurate results, and compensate for large errors
Pending Publication Date: 2020-12-22
CHINA UNIV OF PETROLEUM (EAST CHINA) +2
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[0004] In order to solve the current technical problems such as large and inaccurate resistivity correction errors of highly deviated wells / horizontal wells, the present invention provides a resistivity correction method for highly deviated / horizontal wells based on petrophysical experiments. Solved the problem that the apparent resistivity correction error is too large when the formation dip angle is too large
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[0042] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the present invention, that is, the described embodiments are only some of the embodiments of the present invention, but not all of the embodiments.
[0043] figure 1 It is a flowchart of resistivity anisotropy correction of the present invention, and the method comprises the following steps:
[0044] Step 1, according to the change law of rock resistivity with dip angle combined with mathematical methods to construct resistivity anisotropy inversion model;
[0045] figure 2 It is a schematic diagram of an anisotropic resistivity mathematical model in an anisotropic formation, and the change trend of the model conforms to the la...
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The invention relates to a highly-deviated / horizontal well resistivity correction method based on a rock physical experiment. The method comprises the steps: 1, constructing a resistivity anisotropy inversion model according to the law that rock resistivity changes along with the inclination angle in combination with a mathematical method; 2, measuring the resistivity of the rock in a laboratory through a rock physical experiment, and calculating an anisotropy coefficient lambda according to the relationship between the horizontal resistivity and the vertical resistivity; step 3, calculating aresistivity correction coefficient according to the rock physical experiment data and the theoretical value of the resistivity anisotropy inversion model; and step 4, determining a resistivity correction formula. According to the method, the defect that the error of the Salun-Bezier formula is large under the condition of a large inclination angle is overcome, the calculated value and the measured value have good consistency, and an important parameter basis is provided for interpretation of highly-deviated wells and horizontal wells.
Description
technical field [0001] The invention relates to the field of petroleum exploration and development, in particular to a method for correcting the resistivity of highly inclined / horizontal wells based on petrophysical experiments. Background technique [0002] As unconventional oil and gas has become the key field of oil and gas exploration and development in my country, more and more highly deviated wells and horizontal wells have been put into use. However, compared with vertical wells, highly deviated wells and horizontal wells have various influencing factors, which bring great challenges to well log interpretation. Due to the angle between highly deviated wells and horizontal wells and the actual formation, the evaluation of reservoir anisotropy is becoming more and more important. Anisotropy means that some physical parameters inside the rock have different results in different directions, such as sound velocity, permeability, resistivity and so on. The directional arr...
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IPC IPC(8): G06F30/20E21B49/00
CPCE21B49/00G06F30/20
Inventor 孙建孟崔瑞康闫伟超鞠睿堃李军路菁
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)