Antifreeze device for dual-reagent oil well wellhead dosing pipeline and antifreeze method

An antifreeze device and pipeline technology, which is applied in the direction of wellbore/well components, earthwork drilling, cleaning equipment, etc., can solve the problems of large construction volume, large manual workload, and low degree of automation of electric heating cables, and reduce construction costs , Simplify the structure and ensure the effect of reliable operation

Active Publication Date: 2019-11-22
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide an antifreeze device and antifreeze method for the wellhead dosing pipeline of a dual-medicine oil well. The second purpose is to overcome the problems of large manual workload and low degree of automation in the traditional antifreeze method

Method used

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  • Antifreeze device for dual-reagent oil well wellhead dosing pipeline and antifreeze method
  • Antifreeze device for dual-reagent oil well wellhead dosing pipeline and antifreeze method
  • Antifreeze device for dual-reagent oil well wellhead dosing pipeline and antifreeze method

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no. 1 approach

[0038] refer to figure 1 , the first embodiment of the present invention relates to an antifreeze device for a double-medicine oil wellhead dosing pipeline, including an upper computer 1 and a lower computer 2 that are electrically connected, and also includes a No. 1 medicine tank 3 and a No. 2 medicine tank 7. The said The No. 1 medicine tank 3 is connected to the suction port of the same metering plunger pump 5 through the No. 1 solenoid valve 4, and the No. 2 medicine tank 7 is respectively connected to the suction port of the same metering plunger pump 5 through the No. 2 solenoid valve 8, and the discharge port of the metering plunger pump 5 passes through the wellhead The solenoid valve 6 is connected to the target well 9;

[0039] The No. 1 solenoid valve 4 , the metering plunger pump 5 , the wellhead solenoid valve 6 , and the No. 2 solenoid valve 8 are respectively electrically connected to the lower computer 2 .

[0040] It should be noted that in this embodiment, ...

no. 2 approach

[0046] The second embodiment of the present invention relates to an antifreeze device for the dosing pipeline at the wellhead of a dual-agent oil well, which includes an electrically connected upper computer 1 and a lower computer 2, and also includes a No. There is the No. 2 medicine tank 7 of the oil-based paraffin-repellent agent, the No. 1 medicine tank 3 is connected to the same metering plunger pump 5 through the No. 1 solenoid valve 4, and the No. 2 medicine tank 7 is respectively connected to the same metering plunger pump 5 through the No. 2 solenoid valve 8 The suction port of the metering plunger pump 5 is connected to the target well 9 through the wellhead solenoid valve 6;

[0047] The No. 1 solenoid valve 4 , the metering plunger pump 5 , the wellhead solenoid valve 6 , and the No. 2 solenoid valve 8 are respectively electrically connected to the lower computer 2 .

[0048] Specifically, the upper computer 1 is a remote control terminal, and the remote control te...

no. 3 approach

[0052] This embodiment provides an antifreeze method for the antifreeze device of the wellhead dosing pipeline of a dual-medicine oil well, such as figure 2 shown, including the following steps:

[0053] Step S1, pre-estimating the purge duration, setting the purge time and purge duration of the oil-based wax remover and anti-wax agent on the upper computer 1, and sending the purge time and purge duration to the lower computer 2;

[0054] Step S2, the lower computer 2 controls the No. 2 solenoid valve 8 to close, and at the same time controls the No. 1 solenoid valve 4, the metering plunger pump 5, and the wellhead solenoid valve 6 to open, and the water-based hydrogen sulfide preparation in the No. 1 medicine tank 3 is metered. The plug pump 5 sucks and discharges into the oil casing annulus of the target well 9 to complete the injection of the water-based hydrogen sulfide preparation;

[0055] Step S3, the lower computer 2 controls the No. 1 solenoid valve 4 and the meteri...

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Abstract

The invention provides an antifreeze device for a dual-reagent oil well wellhead dosing pipeline and an antifreeze method. During operation, purge time only needs to be set on a remote control terminal, an oil-based anti-wax remover with the antifreeze property is utilized to purge an entire dosing pipeline system, and after the dosing pipeline is filled with the oil-based anti-wax remover, an RTUcontrols a metering plunger pump and other solenoid valves to close to complete antifreeze. The disadvantages of large amount of construction and high energy consumption due to the fact that a dosingpipeline from a previous dosing device to a wellhead adopts heat tapes to perform antifreeze and heat preservation are overcome. Only the RTU is required to perform simple solenoid valve and pump control according to a program, and the antifreeze and anti-blockage of the pipeline can be realized. The operation is simple, the structure of the dosing device is greatly simplified, energy consumptionis saved, the construction cost is reduced, and on-site reliable operation of the dosing device in winter is ensured.

Description

technical field [0001] The invention belongs to the technical field of oil production, and in particular relates to an antifreeze device and an antifreeze method for a wellhead dosing pipeline of a dual-medicine oil well. Background technique [0002] In the process of oil production in the oil field, the downhole tubing string and oil gathering pipeline of the oil well may be affected by wax precipitation, resulting in abnormal oil well production or wellhead back pressure and many other problems. At the same time, some oil wells are also accompanied by hydrogen sulfide overflow. The health of on-site employees poses a serious threat. In order to effectively avoid the harm caused by hydrogen sulfide to the wellbore and personnel, and to prevent the formation of wellbore wax scale, thereby reducing the wellhead back pressure and maintaining the normal production of oil wells, the most commonly used method is chemical wax prevention, that is, adding oil-based cleaning to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B37/06
CPCE21B37/06
Inventor 田殿龙李永长杨仓海樊晨于洋魏小林白晓红李丽
Owner PETROCHINA CO LTD
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