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Safe and environment-friendly closed underbalanced drilling ground operation method

An underbalanced drilling, safety and environmental protection technology, used in earth-moving drilling, flushing wellbore, wellbore/well components, etc., can solve problems such as the inability to separate and handle hydrogen sulfide safely and effectively, achieve safe and environmental protection operations, ensure personnel and equipment safety, the effect of ensuring life safety

Inactive Publication Date: 2018-06-29
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the technical problem that hydrogen sulfide cannot be safely and effectively separated and processed in the existing underbalanced technology, and to provide a safe and environmentally friendly airtight underbalanced drilling ground operation method. Using this method, on the one hand, it can realize the closed circulation type Separation and treatment of sour natural gas and sour drilling fluid, on the other hand, the removal effect of hydrogen sulfide can be significantly improved

Method used

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  • Safe and environment-friendly closed underbalanced drilling ground operation method
  • Safe and environment-friendly closed underbalanced drilling ground operation method

Examples

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Embodiment 1

[0031] As a preferred embodiment of the present invention, it discloses a method for surface operation of a safe and environmentally-friendly airtight underbalanced drilling, the steps of which are as follows:

[0032] Step 1: The drilling fluid returned from the well flows through the automatic choke manifold 1 for pressure control and then enters the two-phase separator 2 to separate the gas containing hydrogen sulfide; the separated sulfur-containing gas passes through the desulfurization device 5 after desulfurization The ignition device 6 burns;

[0033] Step 2: The drilling fluid returned by the two-phase separator 2 enters the closed vibrating screen 3 to effectively separate the cuttings and the remaining small amount of gas in the drilling fluid; the small amount of sulfur-containing gas separated by the closed vibrating screen 3 passes through the sulfur removal device 5 Finally, it is recovered by the gas recovery device 6, and the cuttings separated by the airtight...

Embodiment 2

[0039] As the best embodiment of the present invention, on the basis of the examples, the airtight vibrating screen used includes a liquid inlet, a hydrogen sulfide probe, a desulfurization agent spray port, a vacuum pump, a spiral chip removal mechanism, a liquid storage tank, a closed box and a vibrating screen; the liquid storage tank is arranged under the airtight box; the liquid inlet and the desulfurizer spray port are opened on the airtight box; the vibrating screen and the spiral row are arranged in the airtight box One end of the vibrating screen is connected to the liquid inlet, and the vibrating screen is arranged obliquely in the airtight box. The oblique arrangement of the vibrating screen in the airtight box means that the vibrating screen faces the liquid inlet One end of the mouth is higher and the other end is lower in an inclined arrangement. The spiral chip removal mechanism is located below the vibrating screen; The airtight box is connected. In the closed...

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Abstract

The invention discloses a safe and environment-friendly closed underbalanced drilling ground operation method and relates to the field of sulfur-containing oil and gas well underbalanced drilling operation. The safe and environment-friendly closed underbalanced drilling ground operation method comprises the following steps that 1, drilling liquid reversing out from a well flows through an automatic throttling manifold, subjected to pressure controlling and then enters a gas-liquid two-phase separator, and sulfur-containing gas is separated; 2, the drilling lithe quid reversing out from the two-phase separator enters a closed vibrating screen, and thus rock debris and residual gas in the drilling liquid are separated; 3, the drilling liquid flowing out from the closed vibrating screen enters a closed circulating tank, the drilling liquid in the tank is subjected to hydrogen sulfide monitoring, and after hydrogen sulfide is monitored, desulphuration treatment is conducted; and 4, the drilling liquid reversing out from the closed circulating tank is pumped into the well through a drilling pump to conduct closed underbalanced drilling, and the gas subjected to desulphuration treatmentis sent to an ignition device to be burned. By adopting the safe and environment-friendly closed underbalanced drilling ground operation method, on the one hand, sulfur-containing natural gas and thesulfur-containing drilling liquid can be subjected to closed circulating-type separating and treatment, and on the other hand, the hydrogen sulfide removing effect can be obviously improved.

Description

technical field [0001] The invention relates to the field of underbalanced drilling operations of sulfur-containing oil and gas wells, in particular to a ground operation method for safe and environment-friendly airtight underbalanced drilling, which is a ground process method for underbalanced drilling operations in sulfur-containing formations. Background technique [0002] With the further deepening of oil and gas exploration, my country has discovered harmful gases such as hydrogen sulfide in deep oil and gas layers such as Sichuan, Bohai Bay, Ordos, Tarim, and Junggar, which seriously hindered the exploration and development of such layers. At present, the gas production of sour gas fields in my country accounts for 60% of the national gas production, and the production of sour gas in the Sichuan Basin accounts for 80% of the total production. Therefore, accelerating the development and application of sour gas reservoirs will help to increase my country's oil and gas su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B21/06
CPCE21B21/067
Inventor 李枝林梁玉林伍贤柱孙海芳韩烈祥高如军唐国军魏强杨玻李赛聂捷左星
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD