Time-lapse logging method while drilling

Abstract

The invention discloses a time-lapse logging while drilling method. The first logging-while-drilling tool and / or the second logging-while-drilling tool installed on the screw rod measure the target formation; store the formation information obtained after measuring the target formation, or upload it to the acquisition terminal , the transmitted data can be used for real-time geosteering and formation evaluation of drilling, and any two or more groups of transmitted or stored data in different time periods can be used for reservoir interpretation and evaluation. The invention realizes real-time geosteering of drilling and time-lapse logging while drilling in different time periods, timely understands the dynamic changes of reservoir fluids, and provides reliable lithology, physical properties and oil-gas parameters for post-drilling logging interpretation and evaluation , and then provide a reliable basis for subsequent reservoir engineering reserve calculation and development plan formulation.

Description

technical field [0001] The invention belongs to the technical field of petroleum well logging, and in particular relates to a logging method with time lapse while drilling. Background technique [0002] During the drilling process, the mud filtrate invades the formation to form an invasion zone of the mud filtrate. The characteristics of the invasion zone are different from those of the original formation, and the logging response is often affected by the invasion effect of the mud filtrate. During the invasion process, the change of fluid parameters is not a stepwise distribution, but a complex dynamic distribution related to time. Mud filtrate invasion into a formation is a function of time, formation permeability, porosity, mudcake permeability, mud filtrate viscosity and fluidity, and pressure differential between wellbore and formation. Formation characteristics change over time due to the above factors. [0003] In the existing wireline logging technology, downhole i...

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Problems solved by technology

[0004] (1) In the reservoir, there is mud intrusion, and the original formation information cannot be measured;

[0005] (2) It takes a certain amount of time to occupy the well, which affects the timeliness of drilling and completion or oil and gas production;

[0006] (3) For highly deviated wells / horizontal wells, the construction of wireline logging is difficult, and it is easy to get stuck or logging failure or logging time is long. In serious cases, even buried instruments, well filling and borehole scrapping may occur.

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