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Overflow detecting system and method for shaft

A detection system and detection method technology, which is applied in the field of drilling, can solve problems such as inability to meet micro flow requirements

Pending Publication Date: 2020-01-14
中石化石油工程技术服务有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, gas kick detection in the domestic and foreign drilling industry is limited to gas kick judgment, and there is no method for quickly and accurately judging the position of gas kick during drilling, which cannot meet the requirements of micro-flow and accurate unconventional well killing

Method used

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  • Overflow detecting system and method for shaft
  • Overflow detecting system and method for shaft
  • Overflow detecting system and method for shaft

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0069] Embodiment 1 of a detection method includes the following steps:

[0070] The first step is to judge whether gas invasion occurs according to the gas-liquid flow rate in the second slurry outlet pipe recorded by the gas-liquid flow rate. When the gas-liquid gas-liquid flowmeter detects gas, gas invasion occurs at the bottom of the well. When no gas is detected by the gas-liquid gas-liquid flowmeter, there is no gas invasion at the bottom of the well.

[0071] In the second step, when the first step determines that gas invasion occurs, reduce the opening of the second throttle valve. The pressure wave generated by the action of the hydraulic throttle valve is the wave source, and the wave propagates along the annular space to the bottom of the well, and is divided into hollow drill pipes. 1, the two loops of the annulus return to the wellhead;

[0072] Based on the different propagation speeds of pressure waves in gas-containing drilling fluid and gas-free drilling flui...

Embodiment approach 2

[0074] Embodiment 2 of a detection method includes the following steps:

[0075] The first step is to reduce or increase the opening of the second throttle valve. The pressure wave generated by the action of the hydraulic throttle valve is the wave source, and the wave propagates along the annular space to the bottom of the well, and is divided into two circuits: the hollow drill pipe and the annular space. Wellhead;

[0076] Based on the different propagation speeds of pressure waves in gas-containing drilling fluid and gas-free drilling fluid, it is judged whether gas kick occurs according to the time difference between the first pressure sensor and the second pressure sensor receiving the pressure wave. When the first pressure sensor When there is a time difference between the second pressure sensor and the pressure wave received by the second pressure sensor, gas kick occurs at the bottom of the well.

[0077] In the second step, when the first step determines that gas in...

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Abstract

The invention provides an overflow detecting system and method for a shaft, and used for achieving gas intrusion detection in prior art. The overflow detecting system for the shaft is used for detecting the gas intrusion position of a well drilling system, the well drilling system comprises a hollow drilling pipe and a vertical cylinder, the outer wall of the vertical cylinder is used for being matched with the inner wall of a well bore, the outer diameter of the hollow drilling pipe is less than the inner diameter of the vertical cylinder, and a second slurry outlet pipe is arranged on the vertical cylinder; and the overflow detecting system for the shaft comprises a first pressure sensor arranged on the hollow drilling pipe, a second throttle valve arranged on the second slurry outlet pipe, a second pressure sensor arranged on the second slurry outlet pipe, and a gas-liquid flow meter arranged on the second slurry outlet pipe. The overflow detecting system can achieve gas intrusion position detection.

Description

technical field [0001] The invention relates to the field of well drilling, in particular to a wellbore overflow detection system and detection method. Background technique [0002] During the drilling process, the excitatory pressure generated when drilling, the density of the drilling fluid is too low, and the formation pressure is abnormal, which will cause the formation pressure to be greater than the annular pressure, causing formation gas to invade the bottom of the well, and gas invasion occurs. In any working condition, when a gas kick occurs, there is a negative pressure difference between the annular space and the formation. If the gas kick is not detected in time and effective measures are not taken, as the gas migrates to the wellhead, it will cause The further increase of the negative pressure difference between the layers will intensify the gas invasion, further deteriorate it, and easily induce blowout and other accidents. Normally, gas kick occurs at the bot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/117
Inventor 张朝举张俊波姜国富简加田王梅张弛陈祎杨小军孔祥伟李榕李春林
Owner 中石化石油工程技术服务有限公司
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