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Airtight online cleaning method for workover operation oil pipe and sucker rod

A technology for sucker rods and oil pipes, which is applied in the field of closed on-line cleaning of oil pipes and sucker rods in well workover operations. It can solve the problems of inability to clean the inner wall of oil pipes, inability to effectively recover melted wax, and poor field application effects, etc., and achieve short operation time. , prevent splashing, and thoroughly clean the effect

Inactive Publication Date: 2019-09-06
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process takes a long time to clean and cannot clean the inner wall of the oil pipe. At the same time, the melted wax cannot be recovered effectively, and it falls into the wellbore polluted formation, and the field application effect is poor.

Method used

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  • Airtight online cleaning method for workover operation oil pipe and sucker rod
  • Airtight online cleaning method for workover operation oil pipe and sucker rod
  • Airtight online cleaning method for workover operation oil pipe and sucker rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] according to Figure 1-6 A method for airtight on-line cleaning of oil pipes and sucker rods for workover operations as shown, comprising the following steps

[0044] Step 1: Install the sucker rod cleaning device 2

[0045] First disassemble the Christmas tree, lift out the polished rod, then install the sucker rod cleaning device 2 and the sucker rod blowout preventer 3 on the tubing hanger in turn, and then connect the airtight cleaning vehicle 4 to the sucker rod cleaning device 2;

[0046] Step 2: Clean the sucker rod 1 and recover the waste liquid

[0047] When the first step is completed, shackle and lift the sucker rod 1, start the piercing pump in the airtight cleaning vehicle 4, pierce the sucker rod 1 with the cleaning medium in the airtight cleaning vehicle 4, and at the same time seal the negative in the cleaning vehicle 4. The pressure recovery system 42 recovers waste liquid or waste gas in real time;

[0048] Step 3: Pull out the sucker rod 1

[0049...

Embodiment 2

[0065] according to Figure 1-6 The airtight on-line cleaning method for well workover tubing and sucker rods shown is different from Embodiment 1 in that the cleaning media in the second, fifth and sixth steps are all steam-hot water medium.

[0066] In actual use, the cleaning medium in step 2, step 5 and step 6 is steam-hot water medium, which makes full use of the dual effects of high-pressure piercing and high-temperature melting wax on the inner and outer surfaces of sucker rods and tubing. The wax deposition is sealed and cleaned, the operation time is short, and the cleaning is more thorough.

Embodiment 3

[0068] The first step is to connect the airtight cleaning vehicle 4 with the sucker rod cleaning device 2, which is to connect the high temperature and high pressure piercing system 41 and the vacuum negative pressure recovery system 42 of the airtight cleaning vehicle 4 to the injection ports 27 and 27 of the sucker rod cleaning device, respectively. The recovery port 26 of the sucker rod cleaning device is connected to establish a wellhead cleaning channel.

[0069] In actual use, the technical solution establishes an outlet for cleaning medium cleaning and a recovery channel for waste liquid and exhaust gas after cleaning, which better realizes the cleaning operation of the sucker rod. All the waste liquid generated during the operation is recovered in real time, and there is no damage to the stratum and ground, which truly realizes the cleaning operation.

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Abstract

The invention belongs to the technical field of oilfield cleaning and workover operation and particularly relates to an airtight online cleaning method for a workover operation oil pipe and a sucker rod. According to the airtight online cleaning method, through the seven steps of mounting of a sucker rod cleaning device, cleaning of the sucker rod and recovery of waste liquid, trip-out of the sucker rod, mounting of an oil pipe cleaning device, cleaning of the outer wall of the oil pipe and recovery of waste liquid, cleaning of the inner wall of the oil pipe and recovery of waste liquid, and trip-out of the oil pipe, by adopting a high-temperature and high-pressure steam-hot water medium, and by utilizing the double effects of high-pressure washing and high-pressure wax melting, crude oiland paraffin deposits on the inner surface and the outer surface of the oil pipe and on the sucker rod are subjected to airtight cleaning, the operation time is short, and cleaning is more thorough, and online synchronous operation of tripping out the sucker rod and the oil pipe is realized; and the problem that the inner wall of an oil pipe cannot be cleaned in the prior art is solved. The wasteliquid generated in the operation process is completely recovered, thus the damage to a formation and the ground is avoided, and cleaning operation is realized truly. The airtight online cleaning method can also be applied to cleaning and workover operation of a well without oil drain devices such as screw pumps.

Description

technical field [0001] The invention belongs to the technical field of oilfield clean workover operations, in particular to a closed-line cleaning method for oil pipes and sucker rods for well workover operations. Background technique [0002] Crude oil and wax blocks are adhered to the surface of oil pipes and sucker rods from workover operations in oil fields. Generally, high-temperature steam of boiler trucks is used for ground cleaning, which is time-consuming and labor-intensive and pollutes the environment. [0003] In recent years, some oilfields in China have used cleaning equipment to install cleaning devices at the wellhead to establish a hot-washing circulation channel to clean the tubing and rods, but the field adaptability is poor. For example, the "On-line Cleaning Process for Oil Pipes and Sucker Rods for Well Workover Operations" disclosed in Patent No. CN105114035A mainly uses steam heat source devices to provide hot water, and establishes circulation in the...

Claims

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Application Information

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IPC IPC(8): E21B37/00E21B41/00
CPCE21B37/00E21B41/005
Inventor 江智强王尚卫巨亚锋李旭梅罗有刚张家富白小佩梁万银张雄涛韩兴林
Owner PETROCHINA CO LTD
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