Probe of FDT (Formation Dynamic Test) module type formation tester

Abstract

The invention discloses a probe of an FDT (Formation Dynamic Test) module type formation tester of a formatting dynamic monitoring system, belonging to the technology of oil-gas exploration. The probe comprises a probe piston, a packer, a probe body, a connecting plate, a connecting screw, a filter sleeve, a filter piston, a probe plug, an elastic block, a positioning sleeve, a baffle ring, a piston body, a pressure-limiting valve, a guide block, a fixing screw and a fluid conveying pipe. According to the probe disclosed by the invention, the area of a formation which is packed by the packer is enlarged, a plurality of diversion trenches are added beside a sampling port of the packer, consequently, liquid sampling is facilitated, and the FDT module type formation tester can be more effectively and safely used in an unconsolidated formation, an oil sheet and a low permeable formation; the FDT module type formation tester is more reliable in sealing, more convenient in positioning and faster in sampling; and the FDT module type formation tester is more convenient and reliable to use, wider in application range and more outstanding in effect.

Description

technical field [0001] The invention relates to oil and gas exploration technology, in particular to an FDT modular bottom tester probe. Background technique [0002] FDT (Formation Dynamic Test System) modular formation test system is an instrument for testing formation pressure and directly sampling formation fluid during oil and gas drilling and development. The FDT modular formation test system is the most direct and effective system for verifying reservoir fluid properties, dividing oil-water and oil-gas interfaces, and obtaining formation productivity in oil and gas exploration. It is the key equipment urgently needed in my country's oil exploration and development. It is one of the main technologies that provide the basis for quality and production potential and formulate a reasonable development plan. [0003] The FDT modular formation tester is widely used in the field of petroleum logging, but the commonly used FDT modular formation tester probes in loose formation...

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Problems solved by technology

[0003] The FDT modular formation tester is widely used in the field of petroleum logging, but the commonly used FDT modular formation tester probes in loose formations are often deformed due to long-term use of the packer or failure of the sealing due to formation collapse, or due to the failure of the sampling port. The area is too small to block; in thin oil layers and low-permeability formations, the probe often fails to find the formation because the sealing area is too small, or the test fails because the sampling time is too long

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