Method and device for remotely monitoring SAGD (steam assisted gravity drainage) horizontal well

Abstract

The invention relates to a method and a device for remotely monitoring an SAGD (steam assisted gravity drainage) horizontal well. An MGT (metal gate transistor) magnetic source is placed on a target position of a producing well after drilling completion, an MWD (measuring while drilling) device with an additionally-mounted MGT magnetic-induction sensor is placed in a gas injection well during drilling, the MGT magnetic source and the MWD device are combined to measure the size of a magnetic field generated by the MGT magnetic source and measure and calculate well track relative positions between the gas injection well and the producing well and calculate well track interval by using measured hole drift angles, azimuth angles and well depth variation, vector parallelism of the two wells is monitored integrally. By adopting the mode of matched using of MWD and MGT, well track parameters are measured in real time, and a variation trend curve chart can be displayed in monitoring software in real time; the well track interval is calculated by applying a novel algorithm through data analysis on the basis of a database, and well track collision preventing and deviation prewarning are realized; and fused comparison of static data and MWD data is realized, and well site and base monitoring integration is realized.

Description

technical field [0001] The invention relates to a remote monitoring of a horizontal well, in particular to a method and a device for remote monitoring of a SAGD horizontal well. Background technique [0002] At present, with the increase of the demand for fossil energy in the world, the oil extraction industry has increased the exploitation of heavy oil. SAGD (Steam Assisted Gravity Drainage, Steam Assisted Gravity Drainage) Parallel horizontal well crude oil recovery technology is to inject high-dryness high-temperature steam into the target layer through the gas injection well to form a steam chamber to heat the heavy oil reservoir, so that the temperature of the crude oil increases and the viscosity coefficient Under the action of gravity, the crude oil is driven to the production well located at the bottom of the target layer, and then continuously produced. The SAGD parallel horizontal well crude oil recovery technology puts forward higher requirements for the drilling...

AI Technical Summary

Problems solved by technology

[0005] 1. In the existing SAGD horizontal well monitoring system, MWD and MGT are relatively independent, forming a separate monitoring mode, and the data information is scattered. The system can only conduct separate monitoring for a certain aspect of the drilling process, which destroys the relationship between data and information. The existing interrelationships cannot realize the integrated and centralized monitoring of the "vector parallel" of SAGD horizontal wells, and thus cannot better ensure the effective implementation of the injection-production process in the later stage of SAGD

[0006] 2. The wellbore trajectory spacing algorithm uses the distance and relative position between the fluxgate sensor and the magnetic field emission source. In the existing monitoring mode, although the MWD and MGT systems can control the drilling construction of SAGD horizontal wells to a certain extent The measurement and monitoring of well inclination, azimuth and wellbore spacing, but the data information is scattered, the monitoring parameters are independent of each other, and the application of information requires the assumption of "approximately parallel"

[0007] 3. The existing monitoring system can only monitor the changing trend of the data, but fails to compare and verify the static data with the real-time curve, and cannot identify the authenticity of the static data, thus failing to ensure the authenticity of the well trajectory

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