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Method for prolonging safe operating cycle of offshore drilling during typhoon dodging

A technology for safe operation and offshore drilling, applied in earth-moving drilling, wellbore/well components, etc., can solve the problem of high pressure, improve the accuracy, improve the safe operation cycle of drilling, and reduce the risk of high pressure

Active Publication Date: 2014-05-07
CHINA UNIV OF PETROLEUM (EAST CHINA)
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AI Technical Summary

Problems solved by technology

During typhoon evacuation, the fluid in the wellbore is in a static state for a long time. If formation gas invades the wellbore, under certain conditions, the gas rises and accumulates towards the wellhead. When the storm valve is released and the well is opened, the pressure is very high, and there is great safety. risk

Method used

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  • Method for prolonging safe operating cycle of offshore drilling during typhoon dodging
  • Method for prolonging safe operating cycle of offshore drilling during typhoon dodging
  • Method for prolonging safe operating cycle of offshore drilling during typhoon dodging

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Embodiment Construction

[0032] Such as figure 1 As shown, the method of increasing the safety operation cycle of offshore drilling during typhoon avoidance includes the following steps:

[0033] 1. Read the basic data of the current well

[0034] According to the actual situation of the current well, read the basic data of the current well, including: drilling fluid density, drilling fluid viscosity, wellbore structure, average pore diameter of formation, position of storm valve, and estimated typhoon avoidance time.

[0035] 2. Divide the wellbore into several cells from bottom to top

[0036] Using the method of non-uniform grid division, the wellbore is divided into several cells from the bottom of the well to the storm valve, respectively 1, 2, 3, ..., N. Since the gas rises slowly at the bottom of the well, the position close to the wellhead The rising speed is fast, so the grid division can be in the form of non-uniform grid, with the bottom sparse and the top dense; because the gas rise spee...

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Abstract

The invention belongs to the field of offshore oil and gas development, particularly relates to a method for prolonging the safe operating cycle of offshore drilling during typhoon dodging. The method includes following steps: reading current basic data of a well; dividing a wellbore into a plurality of cells from bottom to top; determining the diameter of initial bubbles at the well bottom; calculating a safe operating cycle under current drilling fluid condition; judging whether the safe operating cycle meets requirements of typhoon dodging or not; choosing viscosity of injection liquid slug; estimating the length of a high-viscosity liquid slug injected into the well bottom; calculating the safe operating cycle after the high-viscosity liquid slug is injected; judging whether the length of the high-viscosity liquid slug meets a lowest requirement or not; and judging whether the length of the high-viscosity liquid slug is within a longest limit or not. By the method, the safe operating cycle can be longer than the time of typhoon dodging, high-voltage risks during removal of a storm valve are lowered, and safe operating is realized.

Description

technical field [0001] The invention belongs to the field of offshore oil and gas development, and in particular relates to a method for increasing the safety operation period of offshore drilling during typhoon avoidance. Background technique [0002] my country's South China Sea contains a large amount of oil and gas resources, which is an important source of oil and gas in my country. There are frequent typhoons and monsoons in the South my country Sea. When a typhoon comes, normal offshore drilling operations must be stopped, a storm valve is lowered into the wellbore below the mud line to seal the well, and personnel are evacuated from the operation site. When the weather and sea conditions are suitable for drilling operations after the typhoon, the storm valve will be released again to resume normal offshore drilling operations. During typhoon evacuation, the fluid in the wellbore is in a static state for a long time. If formation gas invades the wellbore, under certa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B41/00
Inventor 王志远孙宝江王金波公培斌王宁王金堂
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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