Casing deformation wireless monitoring system in well cementation, fracturing and production processes

Abstract

The invention discloses a casing deformation wireless monitoring system in well cementation, fracturing and production processes, which comprises an underground casing deformation wireless monitor, a transmission channel, a signal relay device and a ground receiving system, and is characterized in that the underground casing deformation wireless monitor and a casing string enter a well together, the casing deformation condition is detected while the casing is centralized, and the signal relay device is connected with the ground receiving system; a casing transformation data signal is modulated, excited and transmitted outwards, the signal relay device amplifies and re-transmits the casing transformation data signal, the ground receiving system receives and demodulates the casing transformation data signal from the signal relay device, and the multi-point detection condition of underground casing deformation is obtained through computer processing. And information such as the deformation position, the deformation degree and the number of casing deformation points of the underground casing can be accurately obtained in real time. According to the invention, real-time monitoring and risk prediction can be carried out on casing deformation conditions in operation construction stages of casing lifting and lowering, cement paste well cementation, perforation, fracturing, production and the like, and positive practical significance is provided for guaranteeing long-acting development of oil and gas resources.

Description

technical field [0001] The invention relates to the technical field of well completion and cementing in oil and gas exploitation, in particular to a wireless monitoring system for casing deformation during well cementing, fracturing and production. Background technique [0002] Casing is the lifeline to maintain the operation of oil and gas wells. In oil and gas production, it is used to support the well wall during the drilling process and after well completion. It plays a role in protecting the wellbore, strengthening the well wall, isolating the oil, gas, and water layers in the well and sealing them. The role of various complex formations ensures the safety of the drilling process and the normal operation of the entire oil well after completion. At present, my country is facing severe challenges in the exploration and production of oil and gas fields. Due to different geological conditions and complex stress states downhole, tension, compression, bending and torsional st...

AI Technical Summary

Problems solved by technology

The monitoring system and monitoring method have high accuracy, complete monitoring functions and high efficiency, but the monitoring system is difficult to construct in the process of optical fiber winding and casing running, and requires a long length of optical fiber to penetrate or extend the downhole seal. If the casing is sheared or deformed, and the fracturing process is strongly disturbed, the optical cable may be worn or even pulled and broken. Once damaged, the cable will be damaged. Can not be repaired, maintainability is not high

[0009] To sum up, the existing technologies can solve the detection and monitoring problems of casing deformation in oil and gas wells to a certain extent. Various technologies have different applicable engineering scenarios, but they also have high cost, need to improve accuracy, and need to optimize convenience. , Low maintainability and other issues, it is urgent to find another way on the existing basis, and propose a comprehensive and strong casing deformation detection / monitoring technology to better solve the problem of frequent abnormal casing deformation in fracturing reconstruction

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