Oil-gas well hot N2 plugging removal technology method and device

A process method and technology for oil and gas wells, applied in isolation devices, wellbore/well parts, earthwork drilling and production, etc., can solve problems such as unsatisfactory effects, and achieve the effects of wide sources, high plugging removal efficiency, and low price

Inactive Publication Date: 2017-09-29
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current common practice is to use partial hot water solution circulation to wash the well, hot oil to dilute and other methods, and the effect is not satisfactory. Once the hot water circulation is used for the low pressure well of the gas well, the well will usually be crushed to death, especially for the blocked one. These methods will fail in wells where the pipe string and gas well kill are sensitive

Method used

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  • Oil-gas well hot N2 plugging removal technology method and device
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  • Oil-gas well hot N2 plugging removal technology method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Simple production string plugging

[0029] 1. Connect the nitrogen generating device, high-pressure injection device, and heating device to the oil (gas) production wellhead through the surface pipeline.

[0030] 2. Pressure test the injection pipeline according to the level of oil (gas) production wellhead. Ordinary oil production wellhead pressure test is 21Mpa, and wellhead pressure test of 35MPa or more is 25MPa, and it is qualified without puncture or leakage.

[0031] 3. Inject hot nitrogen from the annular space of the oil jacket, stay for a certain period of time, release the pressure, inject hot nitrogen again, release the pressure again, repeat this several times, and dissolve the wax in the column through the exchange of hot nitrogen.

Embodiment 2

[0032] Example 2: The tubing annulus and the production string are blocked and there is no circulation channel

[0033] 1. Connect the nitrogen generating device, high-pressure injection device, and heating device to the oil (gas) production wellhead through the surface pipeline.

[0034] 2. Pressure test the injection pipeline according to the level of oil (gas) production wellhead. Ordinary oil production wellhead pressure test is 21Mpa, and wellhead pressure test of 35MPa or more is 25MPa, and it is qualified without puncture or leakage.

[0035] 3. Alternately inject hot nitrogen from the inside of the production pipe string or the annular space of the oil jacket, and after staying for a certain period of time, release the pressure and vent, then inject hot nitrogen again, and release the pressure again, repeat this several times, through the exchange of hot nitrogen, dissolve the inside Wax, so that the solid section of the blockage in the column gradually moves down, an...

Embodiment 3

[0036] Example 3: The oil casing of the pipe string with a packer on the bottom is blocked

[0037] 1. Connect the nitrogen generating device, high-pressure injection device, and heating device to the oil (gas) production wellhead through the surface pipeline.

[0038] 2. Pressure test the injection pipeline according to the level of oil (gas) production wellhead. Ordinary oil production wellhead pressure test is 21Mpa, and wellhead pressure test of 35MPa or more is 25MPa, and it is qualified without puncture or leakage.

[0039] 3. Install the coiled tubing, inject hot nitrogen from the coiled tubing, lift and release the coiled tubing and circulate the hot nitrogen to dissolve the blockage in the string.

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Abstract

The invention discloses an oil-gas well hot N2 plugging removal technology method. The method comprises the steps that a plugging removal device is connected to an oil (gas) extraction wellhead through ground pipelines; step 2, an injection pipeline is subjected to pressure test according to the level of the oil (gas) extraction wellhead; step 3, hot nitrogen is injected into a well, dissolved and subjected to pressure release, the hot nitrogen is injected, dissolved and subjected to pressure release again, and the process is repeated for multiple times until plugging is removed. The device comprises a liquid storage tank, the wellhead and a nitrogen production device, an oil tube is connected to the lower portion of the wellhead and sleeved with a sleeve, an inlet / outlet is formed in the side face of the wellhead and communicated with the oil tube, and an inlet / outlet is formed in the side face of the sleeve and communicated with an annular space portion of the oil sleeve. The method has the advantages that the hot nitrogen does not burn or blast, has no chemical corrosivity or pollution and is safe and reliable, the heating temperature can be controlled to 450 DEG C, and the price is low. The method is suitable for plugging removal of obstruction in an immovable string of a well with thick oil, high pour point oil and high wax-bearing oil and a non-circulation channel of a high pressure gas well, and is high in plugging removal efficiency, the nitrogen can escape rapidly, and the plugging materials can be taken out by gas flowback.

Description

technical field [0001] The invention relates to the technical field of oil and gas field exploitation, in particular to an oil and gas well heat N 2 Blocking removal process method and device. Background technique [0002] In the process of oil and gas field development, along with the production of oil and gas wells, wax deposits and hydrates are often blocked in the production string. Once blockages are formed in heavy oil wells, production will be affected, resulting in a significant drop in fluid production or even no fluid production. . The current common practice is to use partial hot water solution circulation to wash the well, hot oil to dilute and other methods, and the effect is not satisfactory. Once the hot water circulation is used for the low pressure well of the gas well, the well will usually be crushed to death, especially for the blocked one. These methods will fail in wells where the pipe string and gas well kill are sensitive. Contents of the inventio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B37/00E21B36/00
CPCE21B37/00E21B36/00
Inventor 杨丽娟徐克彬李军白田增向荣徐昊洋杜鑫芳张军刘爱民贾容锐杨小涛李进杨昱杨东苏东梅田娜娟
Owner CNPC BOHAI DRILLING ENG
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