FDT modular double-probe formation tester and test system

Abstract

The invention provides an FDT modular double-probe formation tester and a test system which can measure the anisotropic formation pressure and permeability, draw the formation pressure gradient and improve the test accuracy. The formation can be tested from the two sides through two symmetrical probes, mutual backup support can be provided during test sampling, and the backup device in a single-probe system is omitted when the task is completed. The related parameters of an anisotropic formation can be measured, and the tester and the test system are compact and fully functional. A hydraulic power system, two sets of independent formation fluid test systems and two independent probe structure systems work together to complete formation fluid pressure test and permeability test. The problem concerning anisotropic formation permeability and pressure test can be solved. Furthermore, a single-probe formation tester and the FDT modular double-probe formation tester can be combined to realize three-point or multi-point formation fluid sampling.

Description

technical field [0001] The invention relates to oil and gas exploration technology, in particular to an FDT modular dual-probe formation tester and a test system. Background technique [0002] FDT (FormationDynamicTestSystem) modular formation tester is an instrument for testing formation pressure and permeability and directly sampling formation fluid during oil and gas exploration and development. The FDT modular formation test system is the most direct and effective system for verifying the fluid properties of oilfield reservoirs, dividing oil-water and oil-gas interfaces, and obtaining formation productivity. It is the key equipment urgently needed in my country's petroleum exploration and development. It is one of the main technologies that provide the basis for developing a reasonable development plan. [0003] Common formation testers use a single probe system to test the fluid pressure and permeability of a single point in the formation, or use a double isolation syst...

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Problems solved by technology

[0003] Common formation testers use a single probe system to test the fluid pressure and permeability of a single point in the formation, or use a double isolation system to test the overall pressure and permeability of the soft formation. The theoretical basis of the test is based on the fluid pressure and permeability of the formation. On the basis of isotropy, but the permeability and pressure of the real formation have different degrees of difference in all directions, such test results cannot truly reflect the true characteristics of the formation and reservoir properties

Existing testing equipment cannot realize simultaneous testing of anisotropic formation permeability and pressure, and cannot measure formation horizontal permeability, vertical permeability, storage coefficient, and formation pressure gradient, and the test data will be affected by near-wellbore permeability. Influenced by rate interference, it cannot meet the test requirements of field logging in oilfields

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