A testing device for sealing performance of cement sheath in deep water well cementing
A deepwater cementing and testing device technology, applied in construction and other directions, can solve the problems of inability to simulate different stratum conditions and continuous temperature changes, damage to the integrity of the cement sheath, and weak support of the cement sheath.
Inactive Publication Date: 2015-10-21
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
(2) The support effect of the soft strata on the surface layer on the cement sheath is weak, which is easy to cause the cement sheath to be under thermal stress, hydraulic stress or compaction stress (the stress caused by the reduction of the pore pressure of the formation after the release of abnormal high pressure and the subsidence of the formation) Cracks will be generated under the action of etc., and the integrity of the cement sheath will be destroyed.
Existing cement sheath sealing performance devices cannot simulate continuous changes in different formation conditions and temperatures
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[0023] The present invention is further described below in conjunction with specific embodiments.
[0024] A device for testing the sealing performance of a cement sheath in deep water well cementing: comprising a hollow casing (1), a cement stone sheath (2), a simulated formation (3), a steel cylinder (4), a first liquid storage bottle (12), Electric pump (13), high-pressure pump (14), second liquid storage bottle (18) and high-pressure nitrogen cylinder (19), it is characterized in that, described sleeve pipe (1) is hollow part, has inner diameter and outer diameter, so The casing (1) is surrounded by a cement ring (2), a simulated formation (3) and a steel cylinder (4), the upper part of the casing (1) has an upper casing part (5), and the lower part has a lower casing part (6), both sides of the upper casing (5) are upper plugs (7), both sides of the lower casing (6) are lower plugs (8), and the upper casing (5) has a pressure / circulation The inlet (9), the lower sleeve p...
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The invention discloses a testing device for packing performance of a deepwater cementing cement sheath. The testing device comprises a hollow casing pipe (1), a set cement ring (2), a simulated formation (3), a steel cylinder (4), a first liquid storage bottle (12), an electrically driven pump (13), a high pressure pump (14), a second liquid storage bottle (18) and a high pressure nitrogen bottle (19). The testing device can simulates effects to the packing performance of the deepwater cementing cement sheath by changing of hydraulic loading and variable temperature circulation under different conditions of a formation.
Description
technical field [0001] The invention relates to a device for testing the sealing performance of a deep-water well cementing cement sheath. Background technique [0002] The purpose of oil and gas well cementing is to form a complete cement sheath in the casing-formation annulus, effectively isolate the formation, provide effective support and protection for the casing, and confirm the safe, economical and efficient exploitation of oil and gas resources. Isolation of the formation is the most important role of cementing, and it is also the ultimate goal of evaluating the quality of cementing. However, in the cementing operation, cement displacement, cement slurry weathering and later production of oil and gas wells are faced with the loss of balance of annular pressure. or risk of containment failure. A lot of research work has been carried out at home and abroad on the design of equivalent circulating density, selection of displacement flow state, design of pre-fluid, etc. ...
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IPC IPC(8): E21B47/005
Inventor 王成文王瑞和王富华
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)