Method for constructing high-temperature and high-pressure packer performance envelope curve

Abstract

The invention provides a method for constructing a performance envelope curve of a high-temperature and high-pressure packer, which is characterized by mainly according to ISO (International Standards Organization) 14310 and ISO 6892 standards; the working state of the high-temperature and high-pressure packer is judged according to the following principles: 1) before metal parts such as a mandrel / central tube, a metal barrel, a joint, a wedge block, a slip, a piston and a cone of the high-temperature and high-pressure packer enter an elastic limit and sine buckling state, the sealing capacity of the packer is kept unchanged; (2) after all metal parts of the packer enter the elastic limit state, the sealing capacity of the packer begins to decline linearly; (3) after all metal parts of the packer enter the plastic limit and sine buckling state, the packer completely loses the sealing capacity; the performance envelope curve of the high-temperature and high-pressure packer is constructed by combining experimental testing, theoretical calculation and finite element simulation, and the structural design, material optimization and service life prediction of the high-temperature and high-pressure packer are effectively guided. The invention relates to the technical field of deep well, ultra-deep well and deep shale gas horizontal well mining.

Description

technical field

[0001] The invention relates to the technical field of exploitation of deep wells, ultra-deep wells and deep shale gas horizontal wells, in particular to a method for constructing a performance envelope curve of a high-temperature and high-pressure packer. Background technique

[0002] Completion packer is an essential downhole tool in the completion and production process of high-temperature and high-pressure wells. In the process of oil and gas production, a packer is often installed between the tubing and casing. Packer confinement, using the radial expansion and deformation of the packer rubber tube to separate the production layer, isolate the fluid and pressure in the well, so as to meet the needs of oil and gas production or downhole operations (such as acidizing, fracturing and other stimulation measures). The main components of typical high-temperature and high-pressure packers (such as PHP, THT) used in deep wells and ultra-deep wells in my country ...

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