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Seabed in-situ excess pore pressure long-term monitoring device based on casing pipe drilling mode and method

A monitoring device and technology of excess pore pressure, applied in measurement devices, surveying, underwater drilling, etc., can solve the problem of long-term in-situ monitoring in deep seabed, achieve high-precision, true and reliable long-term in-situ observation, save costs, provide The effect of accuracy

Pending Publication Date: 2019-11-08
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the technical problem that the existing equipment in the prior art can only realize short-term testing of pore pressure and cannot carry out long-term in-situ monitoring of the deep seabed, a long-term monitoring of in-situ excess pore pressure on the seabed based on the casing drilling method is provided. device

Method used

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  • Seabed in-situ excess pore pressure long-term monitoring device based on casing pipe drilling mode and method
  • Seabed in-situ excess pore pressure long-term monitoring device based on casing pipe drilling mode and method

Examples

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Effect test

Embodiment 1

[0035] Such as figure 1 As shown, the long-term monitoring device for in-situ excess pore pressure on the oilfield seabed based on the casing drilling method, including detection devices and data processing devices;

[0036] A seabed borehole 1 is longitudinally opened along the seabed 14;

[0037] The detection device is provided with a probe 13, a hydraulic pipe 4 and a sensor 2 sequentially from bottom to top, the probe 13 and the hydraulic pipe 4 are placed in the seabed borehole 1 and the seabed borehole 1 is filled with sealing slurry 9, and the sensor 2 is arranged in the seabed. On the upper surface of the bed 14, the top of the hydraulic pipe 4 is connected to the sensor 2, the sensor 2 is connected to the monitoring device through the coaxial cable 10, and the measurement of the pore water pressure is realized through the monitoring device;

[0038] The probe 13 is sequentially provided with a water-permeable part 6 and a hydraulic pipe connector 12 connected to eac...

Embodiment 2

[0055] Such as figure 2 As shown, the long-term monitoring device for in-situ excess pore pressure in the oil field based on the casing drilling method includes a detection device and a data processing device; a seabed borehole 1 is longitudinally set up along the seabed 14; the detection devices are arranged in sequence from bottom to top The probe 13, the hydraulic pipe 4 and the sensor 2, the probe 13 and the hydraulic pipe 4 are placed in the seabed borehole 1 and the seabed borehole 1 is filled with sealing slurry 9, the sensor 2 is arranged on the upper surface of the seabed 14, and the top of the hydraulic pipe 4 It is connected with the sensor 2, the sensor 2 is connected with the monitoring device through the coaxial cable 10, and the measurement of the pore water pressure is realized through the monitoring device; the probe 13 is sequentially arranged with the water permeable part 6, the hydraulic pipe connector 12, and the water permeable part connected with each ot...

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Abstract

The invention belongs to the technical field of seabed monitoring and discloses a seabed in-situ excess pore pressure long-term monitoring device based on a casing pipe drilling mode. The seabed in-situ excess pore pressure long-term monitoring device comprises a detection device and a data processing device; a seabed drilled hole is formed in the longitudinal direction of a seabed; the detectiondevice is sequentially provided with a probe, a hydraulic pipe and a sensor from bottom to top, the probe and the hydraulic pipe are placed in the seabed drilled hole, the seabed drilled hole is filled with sealing slurry, the sensor is arranged on the upper surface of the seabed, the top end of the hydraulic pipe is connected with the sensor, and the sensor is connected with the data processing device through coaxial cables; and the probe is provided with a water-permeable part and a hydraulic pipe connecting part from bottom to top, wherein the water-permeable part and the hydraulic pipe connecting part are connected mutually, the lower end of the water-permeable part penetrates into a deeper seabed at the bottom of the seabed drilled hole, and the upper end of the hydraulic pipe connecting part is connected with the hydraulic pipe; and the water-permeable part, the hydraulic pipe connecting part and the hydraulic pipe are all hollow to form hydraulic transmission channels. The seabed in-situ excess pore pressure long-term monitoring device can measure the pore water pressure at any height of the seabed, long-time monitoring can be realized, and the defect that monitoring is conducted by a probe rod in the prior art is overcome.

Description

technical field [0001] The invention belongs to the technical field of seabed monitoring, and in particular relates to a long-term monitoring device and a monitoring method for in-situ excess pore pressure on the seabed. Background technique [0002] Pore ​​water pressure is the pressure of the fluid in the pores between the individual particles that make up the soil matrix. From the basic concept of geotechnical engineering - effective stress principle, the importance of pore pressure is obvious. Effective stress in a soil mass is a function of total stress and pore pressure, which provide two main definitions of stress states, with all geotechnical analyzes including strength and deformation falling into one of these stress states. For example, soil strength depends on effective stress, and in the case of long-term slope stability, the most relevant analysis methods use the effective stress state. In oilfield production areas, the importance of pore pressure and effectiv...

Claims

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Application Information

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IPC IPC(8): E21B7/12E21B47/001E21B47/06E21B47/12G01D21/02G01L11/00
CPCE21B7/12E21B47/001E21B47/06E21B47/12G01D21/02G01L11/00
Inventor 刘涛朱永茂魏冠立杨秀卿张艳郭珍琦戴国威陈睿奇苏秀婷
Owner OCEAN UNIV OF CHINA
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