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Method for monitoring and controlling hydrogen sulfide in sulfur-containing stratum underbalanced drilling

A technology of underbalanced drilling and control method, applied in the directions of surveying, earthwork drilling, flushing wellbore, etc., can solve problems such as safety accidents, hydrogen sulfide volatilization, atmospheric environment damage, etc., and achieve the effect of avoiding safety accidents

Active Publication Date: 2012-10-10
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the above method, the solid control system is an open structure, which is directly connected to the atmosphere. If the airtight device does not completely remove the hydrogen sulfide in the drilling fluid, so that the drilling fluid containing hydrogen sulfide enters the solid control system, then there will be Very serious consequences, hydrogen sulfide will volatilize into the atmosphere, causing immeasurable damage to the atmospheric environment, and also cause serious safety accidents

Method used

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  • Method for monitoring and controlling hydrogen sulfide in sulfur-containing stratum underbalanced drilling
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  • Method for monitoring and controlling hydrogen sulfide in sulfur-containing stratum underbalanced drilling

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Embodiment 1

[0029] Refer to the attached figure 2 , the invention discloses a method for monitoring and controlling hydrogen sulfide in underbalanced drilling in sulfur-bearing formations. First, the drilling fluid containing hydrogen sulfide returned from the well is processed through a closed device, and the closed device at least includes a closed sampler, four Phase separator, closed grit chamber, closed oil storage tank, closed drilling fluid buffer tank and vacuum degasser, the treated drilling fluid is discharged into the solids control system, and after the performance of the drilling fluid is adjusted, it is circulated to In the well, when the drilling fluid passes through the closed sampler, the hydrogen sulfide content in the drilling fluid is monitored, and the monitored hydrogen sulfide content signal is input to the control system. The sulfur agent goes to the four-phase separator and reacts the hydrogen sulfide in the drilling fluid with the sulfur removal agent to remove ...

Embodiment 2

[0031] Refer to the attached figure 1 , 2 , a preferred embodiment of the present invention is: on the basis of embodiment 1, when the drilling fluid passes through the closed grit chamber, the closed oil storage tank and the closed drilling fluid buffer tank, the content of hydrogen sulfide in the drilling fluid is monitored respectively, And input the monitored hydrogen sulfide content signals to the control system, the control system respectively converts the amount of corresponding desulfurization agent required and issues instructions, injects desulfurization agent and makes the closed grit chamber, closed oil storage tank and The hydrogen sulfide in the closed drilling fluid buffer tank reacts with the respective injected desulfurizers to further remove residual hydrogen sulfide.

Embodiment 3

[0033] Refer to the attached figure 1 , 2 , 3, another preferred embodiment of the present invention is: on the basis of embodiment 1 or 2, also carry out the monitoring of hydrogen sulfide content to the drilling fluid that flows out by closed drilling fluid buffer tank, when hydrogen sulfide is still not completely removed , or the hydrogen sulfide content in the drilling fluid returned from the well suddenly rises, but the sealing device cannot be completely removed, the detected hydrogen sulfide content signal is input to the control system, and the control system issues an instruction: close the closed drilling fluid buffer tank and solid control The valve on the system, and open the valve between the closed drilling fluid buffer tank and the drilling pump, so that the drilling fluid is directly pumped into the standpipe by the drilling pump; when the hydrogen sulfide content of the drilling fluid flowing out of the closed drilling fluid buffer tank is monitored When it ...

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Abstract

The invention discloses a method for monitoring and controlling sulfureted hydrogen in sulfur-containing stratum underbalanced drilling. The content of the sulfureted hydrogen in drilling fluid is monitored when the drilling fluid passes through a hermetic sampler, the monitored signal of the content the sulfureted hydrogen is inputted to a control system which converts the signal into the quantity of required sulfur remover and sends an order, the sulfur remover is injected into a four-phase separator so that the sulfureted hydrogen in the drilling liquid and the sulfur remover is reacted with each other to remove the remaining sulfureted hydrogen. The invention can monitor the content of the sulfureted hydrogen contained in each equipment of the hermetic device in real time and carry out corresponding control action, thereby, preventing the sulfureted hydrogen from entering into a solid control system and being directly volatilized into atmosphere to pollute atmosphere and occur accident.

Description

technical field [0001] The invention relates to the technical field of hydrogen sulfide monitoring and control methods for underbalanced drilling in sulfur-bearing formations, and is used for monitoring and controlling the hydrogen sulfide in the drilling fluid returned from the well. Background technique [0002] Underbalanced drilling technology can effectively protect reservoirs and increase drilling speed, so it has been widely used in my country in recent years. The sulfur-bearing oil and gas reservoirs are widely distributed in my country and are important oil and gas resources in my country. Therefore, the implementation of underbalanced drilling in sulfur-bearing oil and gas reservoirs is of great significance for accelerating the exploration and development of oil and gas resources and ensuring the country's oil and gas security. [0003] The underbalanced ground equipment currently used in China (including liquid-gas separators, skimming tanks, and solids contr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/08E21B21/06E21B47/00
Inventor 羡维伟张保贵刘小玮郑冲涛柏轲
Owner BC P INC CHINA NAT PETROLEUM CORP
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