Logging-while-drilling method based on time lapse

Abstract

The invention discloses a logging-while-drilling method based on the time lapse. The method includes the first step of arranging a first logging-while-drilling tool on the lower portion of a threaded rod and arranging a second logging-while-drilling tool on the upper portion of the threaded rod, the second step of measuring a target stratum through the first logging-while-drilling tool and / or the second logging-while-drilling tool arranged on the threaded rod sequentially at different drilling stages, and the third step of storing stratum information obtained by measuring the target stratum or uploading the stratum information to a collection terminal, wherein the data transmitted actually can be used for carrying out real-time drilling geosteering and formation evaluation, and any two or more sets of actually transmitted or stored data at the different stages can be used for analyzing and estimating reservoir stratums. Through the method, the real-time drilling geosteering and logging while drilling based on the time lapse at the different stages can be achieved, the dynamic changes of reservoir fluid can be timely known, reliable lithological parameters, physical property parameters and oil-gas possibility parameters can be provided for analysis and estimation of logging after drilling, and consequently a reliable basis is provided for planning of follow-up reservoir engineering reserve calculation and development programs.

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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