Top water exclusion effect identification method

A technology for oil production wells and packers, which is applied in the field of water isolation and oil production effect identification, and can solve the problems of complex process, high cost, inability to judge and so on.

Pending Publication Date: 2021-02-12
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is complicated in process, and needs to stop the well, and then use the pump truck, and the cost is high
[0003] In addition, the most commonly used simple method at present is to test the formation water. According to the water type, it is judged whether it is casing water or formation water. If it is casing water, the packer isolation will be invalid. If the fluid entering the wellbore is poured backward, it may cause misjudgment. In addition, if the casing break water is consistent with the formation water type and the salinity is similar, it cannot be judged.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0038]This embodiment provides a method for ground recognition of the effect of water-proof oil production, such asfigure 1 As shown, including the following steps:

[0039]S1. Maintain normal production of isolation oil wells;

[0040]S2. Open the oil sleeve annulus gate and vent the casing gas;

[0041]S3. Install a water-proof oil extraction effect identification device at the outlet of the oil jacket annulus;

[0042]S4. Judge the setting effect of the packer through the water-insulating oil recovery effect identification device; if the packer is set well, it can indicate that the water-insulating oil recovery measures are effective, even if the oil well productivity cannot be recovered in the later stage, it can be ruled out The problem of the failure of the packer's isolation and production is to eliminate interference factors for further searching for the decline of oil well productivity.

Embodiment 2

[0044]On the basis of Example 1, since the plastic film has good sealing performance and is relatively soft, it responds significantly to the breathing phenomenon existing in the annulus of the oil sleeve, so the present invention selects the plastic film as the test material.

[0045]In the present invention, a plastic film is sheathed on the annulus outlet of the oil sleeve, and the pumping unit drives the piston of the pumping pump to reciprocate up and down during normal oil well production, causing the oil sleeve annulus to fluctuate up and down, and breathing phenomenon occurs at the annulus outlet of the oil sleeve. According to the principle, if the plastic film has no obvious periodic respiration, it means that the packer has a good setting effect for water and oil extraction and there is no leakage. If the plastic film has obvious periodic respiration, it means that the packer is not tightly isolated and set, and there is leakage.

[0046]Specifically, the ground recognition met...

Embodiment 3

[0057]In order to further optimize the ground identification method for water-insulating oil recovery effect, the present invention also provides a water-insulating oil recovery effect identification device, such asfigure 2 Shown, including:

[0058]The pressure plate 1 has a through hole in the axial direction;

[0059]Membrane 2, the membrane 2 can be detachably connected in the through hole;

[0060]Measuring part, the measuring part is detachably connected to the upper surface of the pressure plate 1, and the measuring end of the measuring part is perpendicular to the center of the upper surface of the film 2;

[0061]The sealing part is fixed at the bottom end of the pressure plate 1.

[0062]As a further optimization, the measuring part includes: a distance meter 5, a bracket 6, a clamping ring 7 and a positioning nut 8. One end of the bracket 6 is fixed on one side of the upper surface of the pressure plate 1, and the clamping ring 7 is fixed On the other side of the bracket 6, the distance...

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PUM

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Abstract

The invention provides a top water exclusion effect identification method. The top water exclusion effect identification method comprises the steps that S1, normal production of a top water exclusionwell is kept; S2, an oil sleeve annulus gate is opened, and casing gas is exhausted; S3, a top water exclusion effect identification device is installed at an oil sleeve annulus outlet; S4, the setting effect of a packer is judged through the top water exclusion effect identification device; and S5, the original oil sleeve annulus process is restored, and the identification is completed. Accordingto the top water exclusion effect identification method, whether a plastic film has a corresponding breathing phenomenon or not is observed along with up-down stroke reciprocating motion of an oil pumping unit, and if no obvious breathing phenomenon exists, it is indicated that the top water exclusion setting effect of the packer is good, and no leakage situation exists; and if the plastic film obviously has the breathing phenomenon, it is indicated that the top water exclusion setting effect of the packer is not tight, and the leakage situation exists. According to the top water exclusion effect identification method, the setting effect of the top water exclusion packer is identified on the premise that a pipe column is not moved and the well is not stopped, identification is almost freeof cost and risk, and normal production of the oil well is not affected.

Description

Technical field[0001]The invention belongs to the technical field of oil and natural gas exploitation, and specifically relates to a method for identifying the effect of water-proof oil extraction.Background technique[0002]In the process of oilfield development, as the production time of oil wells prolongs, due to measures such as acid fracturing, formation fluid corrosion, formation stress changes, etc., some oil well casings will gradually suffer damage and destruction. Once the casing leaks, External formation water may enter the wellbore through the casing break point to invert the formation, causing the water cut of the oil well to increase, the productivity is affected, and even the production layer is contaminated, causing blockage near the well and further reducing the productivity of the oil well. At present, the most commonly used treatment method for this problem is the use of packers for water-isolated oil recovery. If the water content of the oil well is significantly r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/00E21B33/12
CPCE21B47/00E21B33/12
Inventor 梁万银王尚卫巨亚锋罗有刚江智强张雄涛白小佩赵鹏玉张家富张安康
Owner PETROCHINA CO LTD
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