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Emergency treatment method of hydrogen sulfide in unbalanced drilling fluid ground circulating system

An underbalanced drilling and circulation system technology is applied in the field of emergency treatment of hydrogen sulfide in the drilling fluid ground circulation system, which can solve the problems affecting the removal effect and efficiency of hydrogen sulfide, and achieve the effects of preventing leakage and prolonging the reaction time.

Inactive Publication Date: 2017-09-12
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the above-mentioned methods for treating hydrogen sulfide in the prior art, excessive addition of desulfurizer to the drilling fluid will have a certain impact on the performance of the drilling fluid material, and therefore will impose certain restrictions on the amount of desulfurizer added. After limiting the amount of sulfur removal agent added, it will affect the removal effect and efficiency of hydrogen sulfide

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  • Emergency treatment method of hydrogen sulfide in unbalanced drilling fluid ground circulating system
  • Emergency treatment method of hydrogen sulfide in unbalanced drilling fluid ground circulating system

Examples

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Embodiment 1

[0024] As a preferred embodiment of the present invention, with reference to the attached figure 1 , this example discloses:

[0025] The emergency treatment method for hydrogen sulfide in the underbalanced drilling fluid surface circulation system, firstly, the drilling fluid containing hydrogen sulfide returned from the well is depressurized and then enters the multi-phase separator for liquid-gas separation, and the separated drilling fluid is discharged to solid In the control system; before or when the drilling fluid enters the solid control system, the hydrogen sulfide content in the drilling fluid is monitored. When the monitored hydrogen sulfide content exceeds the standard and cannot continue to be discharged into the solid control system, inject sulfur removal Add the agent to the multiphase separator, and make the hydrogen sulfide in the drilling fluid react with the desulfurizer; adopt the following treatment methods to treat the drilling fluid; open the branch pip...

Embodiment 2

[0027] As another preferred embodiment of the present invention, with reference to the attached figure 1 , this example discloses:

[0028] The emergency treatment method for hydrogen sulfide in the underbalanced drilling fluid surface circulation system, firstly, the drilling fluid containing hydrogen sulfide returned from the well is depressurized and then enters the multi-phase separator for liquid-gas separation, and the separated drilling fluid is discharged to solid In the control system; before or when the drilling fluid enters the solid control system, the hydrogen sulfide content in the drilling fluid is monitored. When the monitored hydrogen sulfide content exceeds the standard and cannot continue to be discharged into the solid control system, inject sulfur removal put the agent into the multiphase separator, and make the hydrogen sulfide in the drilling fluid react with the desulfurizer; adopt the following treatment methods to treat the drilling fluid; the unsepar...

Embodiment 3

[0030] As another preferred embodiment of the present invention, with reference to the attached figure 1 , this example discloses:

[0031] The emergency treatment method for hydrogen sulfide in the underbalanced drilling fluid surface circulation system, firstly, the drilling fluid containing hydrogen sulfide returned from the well is depressurized and then enters the four-phase separator for liquid-gas separation, and the separated drilling fluid is discharged to solid In the control system; before or when the drilling fluid enters the solid control system, the hydrogen sulfide content in the drilling fluid is monitored. When the monitored hydrogen sulfide content exceeds the standard and cannot continue to be discharged into the solid control system, inject sulfur removal Add the agent to the four-phase separator, and make the hydrogen sulfide in the drilling fluid react with the desulfurizer; use the following treatment methods to treat the drilling fluid; use the combinat...

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Abstract

The invention discloses an emergency treatment method of hydrogen sulfide in an unbalanced drilling fluid ground circulating system, which relates to the technical field of petroleum exploitation and drilling process. The hydrogen sulfide in drilling fluid returned in a well is monitored in real time, a drilling fluid treatment control process is controlled by virtue of three emergency guarantee methods of adding a desulphurizing agent, bypass refluxing and circularly re-charging when a ground separation system cannot completely separate toxic and harmful gases, the drilling fluid can also be processed by combining various methods provided by the invention, so that the harm of the volatilization of toxic and harmful gases such as hydrogen sulfide into a solid control system on the personnel and the environment can be maximally avoided.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling and drilling technology, and more specifically relates to an emergency treatment method for hydrogen sulfide in a drilling fluid surface circulation system mainly used in a closed underbalanced drilling circulation system in which the atmosphere is isolated. Background technique [0002] The conventional underbalanced drilling process drilling fluid surface circulation system mainly includes choke manifolds, multiphase separators, solids control systems and circulation tanks and other treatment devices. The liquid-gas separator in the circulation system is mainly used to separate the formation gas returned from the wellbore with the drilling fluid. In the sulfur-bearing formation, it contains gases such as natural gas and hydrogen sulfide. If in the surface circulation system, the multiphase separator cannot completely separate and process the formation gas, it will cause the possibilit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B21/06
CPCE21B21/067E21B21/068
Inventor 羡维伟韩烈祥陈科旭张鹏潘登任伟郑冲涛刘小玮刘先明程艳孙翊成何嵬
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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