Method for using rolling-type three-dimensional controllable source electrical method to monitor and evaluate well drilling fracturing

Abstract

The invention discloses a method for using a rolling-type three-dimensional controllable source electrical method to monitor and evaluate well drilling fracturing. A long-offset long lead is used forcarrying out power supply and field building, a non-polarized electrode is used for grounding, and a multi-channel receiver collects information of an artificial electric field and a natural electricfield. Evaluation is carried out through information collected before and after fracturing. An electric source with multiple strands of electrode wires connected in parallel is used for building the field, and the non-polarized electrode is used for measuring potential information of a ground surface natural field and a secondary field. A high-power generator is used for supplying a high-ampere current to the ground to build the field, a transmitter and a receiver are synchronized through a satellite, and continuous collection of a primary field and a secondary field is achieved. Due to a factthat the artificial source is adopted for building the field, the method can not influence microseism monitoring and can also be carried out simultaneously with the microseism monitoring. The technology is good in economic benefit, equipment cost is far lower than that of microseism monitoring equipment, monitoring construction cost is slightly lower than that of microseism, meanwhile, a monitoring effect is good, and sensitivity of electromagnetic waves to a fracturing fluid is far higher than that of seismic waves to the fracturing fluid.

Description

technical field [0001] The invention relates to a method for calculating and analyzing detection information, which belongs to the field of applied geophysics and can be applied to the exploration of petroleum and nonferrous metal deposits, and is especially suitable for evaluating the fracturing effect of drilling horizontal well sections and the effect of reservoir transformation. Background technique [0002] Drilling projects in the petroleum industry cost a lot of money, but the actual success or failure of drilling is determined by the success or failure of fracturing, but the effectiveness of drilling and fracturing can only be verified by post-fracturing processes such as "reverse drainage" and "trial production" after fracturing , so it is very important to develop a set of economical, effective and rapid fracturing effect evaluation methods. [0003] The technology uses a controlled source electrical method to excite the geophysical fields of the fractured stage. ...

AI Technical Summary

Problems solved by technology

The difficulty of this technology is the non-plane wave characteristics of the near-field source, which is manifested as the near-field effect in the low-frequency band where the resistivity decreases with frequency and rises at 45° on the log-logarithmic coordinate diagram.

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