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A method for unblocking oil well wellbore

A wellbore and oil well technology, which is applied in the field of oil well wellbore plugging removal, can solve problems such as poor plugging removal effect of oil wells, and achieve the effect of solving poor plugging removal effect and effective plugging removal

Active Publication Date: 2021-08-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for unblocking the shaft of an oil well, which solves the technical problem that the existing unblocking method has a poor effect on oil wells with severe clogging.

Method used

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  • A method for unblocking oil well wellbore
  • A method for unblocking oil well wellbore
  • A method for unblocking oil well wellbore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The wellbore deblocking method of oil wells provided in this example is used to deblock the clogging objects in the wellbore. By adopting step-by-step deblocking, the effective deblocking of the wellbore with serious blockage is realized, and the wax scraping sheet cannot be used in the wellbore with severe blockage. down the issue.

[0047] figure 1 It is a schematic flow chart of the oil well wellbore plugging removal method provided by Embodiment 1 of the present invention, figure 2 It is a schematic diagram of the connection of each equipment when pressurization is provided in Embodiment 1 of the present invention. The method for unblocking the wellbore of an oil well includes the following steps:

[0048] Step 101, detecting the size of the opening inside the shaft.

[0049] In this embodiment, when the blockages such as colloid and asphaltene on the inner wall of the wellbore increase, the diameter of the inside of the wellbore will decrease, so the number of b...

Embodiment 2

[0069] image 3 It is a schematic flow diagram of the oil well wellbore plugging removal method provided by Embodiment 2 of the present invention, specifically including as follows:

[0070] Step 101, detecting the size of the opening inside the shaft.

[0071] Step 102. Determine the clogging level in the wellbore according to the size of the opening. The clogging level includes: mild clogging and severe clogging. If it is judged that the clogging level is severe clogging, go to step 103, and if it is judged to be mild clogging, go to step 104.

[0072] Step 103, when it is judged that the clogging level in the wellbore is severe clogging, use a dissolving agent to pressurize and squeeze the inner wall of the wellbore.

[0073] Step 104: When it is judged that the clogging level in the wellbore is mild clogging, expand the nozzle diameter of the oil well so that the high-temperature fluid in the wellbore flows out to the wellhead to flush the inner wall of the wellbore.

[...

Embodiment 3

[0082] Figure 4 It is a schematic flow chart of the oil well wellbore plugging removal method provided in Embodiment 3 of the present invention, Figure 5 It is a schematic diagram of the connection of equipment during thermal flushing in the oil well wellbore plugging removal method provided in Embodiment 3 of the present invention. In this embodiment, the plugging removal is carried out in the ways of "one expansion", "two squeezing" and "three washings". Specifically, Including the following steps:

[0083] Step 101, detecting the size of the opening inside the shaft.

[0084] Step 102. Determine the clogging level in the wellbore according to the size of the opening. The clogging level includes: mild clogging and severe clogging. If it is judged that the clogging level is severe clogging, go to step 103, and if it is judged to be mild clogging, go to step 104.

[0085] Step 103, when it is judged that the clogging level in the wellbore is severe clogging, use a dissolvi...

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Abstract

The present invention provides a method for removing clogging in an oil well shaft. The method for removing clogging in an oil well shaft includes: detecting the size of the opening inside the well shaft, and judging the clogging level in the well shaft according to the size of the opening. The clogging level includes mild clogging and severe clogging. blockage; when it is judged that the blockage level in the wellbore is the severe blockage, the inner wall of the wellbore is pressurized and squeezed with a dissolving agent. It is a technical problem that the plugging effect of the oil well with serious blockage is not good.

Description

technical field [0001] The invention relates to the technical field of oil field equipment, in particular to a method for unblocking an oil well shaft. Background technique [0002] In the process of oilfield development, crude oil often needs to be lifted from the bottom of the well to the surface. In the process of oil and gas flow from the bottom of the well to the wellhead, impurities such as colloids and asphaltene contained in the crude oil continue to decrease with temperature. And gradually precipitated, adsorbed on the inner wall of the oil cylinder, causing the inner diameter of the oil cylinder to shrink, reducing the oil flow channel, the longer the production time, the more serious the wax deposition, and the clogging of the oil cylinder to varying degrees. It is the key to the normal production of oil wells to keep the wax on the wellbore smooth. [0003] At present, the treatment method for the clogging of foreign matter (colloid, asphaltene, etc.) in the oil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B37/06E21B37/02
CPCE21B37/02E21B37/06
Inventor 杨小华杨其展杨文明刘敏刘迎斌徐文涛杨晓东曹宏王宏高春海段云江杨国和
Owner PETROCHINA CO LTD