Formation testing and sampling dual-packer

Abstract

The invention discloses a formation testing and sampling dual-packer. The formation testing and sampling dual-packer comprises a first packer unit, an automatic recycling arm 1, an isolation pup joint (selectable), a second packer unit, an automatic recycling arm 2 and a hydraulic control section. Packing elements of the first packer unit and the second packer unit are expandable packer rubber sleeves, the automatic recycling arms are installed on the lower ends of the expandable packer rubber sleeves of the first packer unit and the second packer unit, the isolation pup joint (selectable) is connected to the lower end of the first packer unit and the upper end of the second packer unit, the isolation pup joint (selectable) or the second packer unit is provided with an inlet for sucking liquid, the inlet is provided with a wire-wrapped screen serving as a filter screen, and the lower end of the second packer unit is connected with the hydraulic control section. According to the invention, dependence on geological conditions is eliminated, a large-area large-space pressure testing and sampling scheme is achieved, the problem that the packer rubber sleeve cannot be released smoothly is solved, and the formation testing and sampling dual-packer can be applied to barefoot wells or cased wells.

Description

technical field [0001] The invention relates to a double packer for stratum testing and sampling, which relates to a traditional DST drill pipe tester and a stratum tester, and belongs to the field of petroleum exploration and testing. Background technique [0002] At present, formation pressure testing and formation sampling technologies mainly include conventional DST drill pipe test and probe formation tester. The traditional DST drill pipe test has problems such as long operation time, easy formation pollution, high test cost, and difficulty in setting the packer; the probe formation test is highly dependent on geological conditions, and the setting area is small. The length of the needle is limited, the pressure test and sampling area are relatively small, and it is difficult to obtain real and representative formation fluid, which makes subsequent sample analysis and geological exploration difficult. Contents of the invention [0003] In order to solve the above pro...

AI Technical Summary

Problems solved by technology

The traditional DST drill pipe test has problems such as long operation time, easy formation pollution, high test cost, and difficulty in setting the packer; the probe formation test is highly dependent on geological conditions, and the setting area is small. The length of the needle is limited, the pressure test and sampling area are relatively small, and it is difficult to obtain real and representative formation fluid, which makes it difficult for subsequent sample analysis and geological exploration

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