Indoor experimental device for simulating interaction of deep water drilling underwater casing string and seabed shallow soft soil

Abstract

The invention discloses an indoor experimental device for simulating interaction of a deep water drilling underwater casing string and seabed shallow soft soil. The indoor experimental device comprises a hollow barrel-shaped object (1), a bottom clamping device (2), a variable cross-section casing string combination (3) and a data acquisition system (15), wherein the bottom of the hollow barrel-shaped object (1) is provided with the bottom clamping device (2) which is used for clamping and fixing the bottom end of the variable cross-section casing string combination (3) for an experiment; and the data acquisition system (15) is connected with a force sensor (12) of a cyclic loading device (9), an acceleration sensor (10) and a telescopic displacement sensor (11) which are arranged at the top of a casing string, a strain gauge (6) attached on the pipe wall of the variable cross-section casing string combination (3), and a soil pressure meter embedded in the periphery of the variable cross-section casing string combination (3), and is used for acquiring experimental data in real time. According to the indoor experimental device, the indoor experiment research of the interaction mechanism of the underwater casing string and the seabed shallow soft soil under the action of a transverse circulating load under different working conditions of deep water drilling can be completed, an experiment result can provide support for deep water drilling in China, and remarkable economic benefit is brought.

Description

technical field [0001] The invention relates to the technical field of marine deepwater drilling, in particular to an indoor experimental device for simulating the interaction between an underwater casing string of deepwater drilling and soft soil in the shallow part of the seabed. Background technique [0002] In deepwater drilling, the underwater wellhead is connected with blowout preventer group and riser, and the casing string (composed of conduit and other casings) is connected below. Factors such as the advanced water riser pipeline and the increased weight of the blowout preventer group all put forward higher requirements on the stability of the underwater wellhead. The force on the underwater wellhead during deepwater drilling mainly comes from the vertical and lateral reaction forces at the bottom joint of the riser, the gravity of the blowout preventer group and the hanging casing string, and the transverse wave flow acting on the blowout preventer group and the we...

AI Technical Summary

Problems solved by technology

[0005] Therefore, the current traditional pile foundation dynamic test analysis method cannot solve the problem of the interaction between the deepwater drilling underwater casing string and the shallow soft soil on the seabed.

In addition, since my country has not carried out deepwater drilling operations on-site practice, and there is no mature experimental research program for the interaction between deepwater drilling underwater casing string and soft soil in the shallow seabed.

Images