A method for anti-corrosion of the annulus of the oil casing of the packer completion gas well
An oil-casing annulus and packer technology is applied in the field of pipeline anti-corrosion, which can solve the problems of high operating cost, large amount of corrosion inhibitor, and inappropriate anti-corrosion treatment, and achieves reduction of corrosion rate, low cost, and convenient scale. The effect of promoting the application
Active Publication Date: 2019-08-02
PETROCHINA CO LTD
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Problems solved by technology
[0005] When anti-corrosion treatment is carried out on the oil casing annulus through the existing technology, the injection amount of corrosion inhibitor is large and the operation cost is high, and this method is not suitable for anti-corrosion treatment of oil and gas wells that have been shut down
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Embodiment 1
[0047] This embodiment provides an anti-corrosion method for the annulus of a packer completion gas well, by which the Longgang 001-23 well is treated with anti-corrosion. The Longgang 001-23 well was completed with a packer. After the start of production, the casing pressure gradually increased from 0, and finally higher than the oil pressure, indicating that there is leakage in the oil casing annulus and the oil casing annulus anti-corrosion treatment is required. The specific production situation of Longgang 001-23 well is shown in Table 1:
[0048] Table 1 Production data of Longgang 001-23 well
[0049]
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Abstract
The invention discloses a corrosion resisting method for a tubing-casing annulus in well gas well completion with a packer, and belongs to the field of pipeline corrosion resistance. The method comprises the following steps: the concentration of iron ions of liquid in the tubing-casing annulus is initially detected, and the initial concentration of the iron ions and the initial detecting date arerecorded; according to a pre-passivating treatment experience formula, the use level of an oil soluble corrosion inhibitor in the pre-passivating treatment is calculated; the oil soluble corrosion inhibitor is pumped into the tubing-casing annulus according to the use level of the oil soluble corrosion inhibitor to form corrosion resisting protective films on the inner wall of a casing and the outer wall of a tubing; the concentration of the iron ions of the liquid in the tubing-casing annulus is detected by every other preset time and recorded until the difference between the concentration ofthe iron ions and the initial concentration is smaller than 5-10 ppm, the date of the present day is recorded as the detecting completion date, and the interval days from the initial detecting date are calculated, and the days are used as the pre-passivating treatment period; and according to the pre-passivating treatment period and the use level of the oil soluble corrosion inhibitor, the oil soluble corrosion inhibitor is pumped into the tubing-casing annulus for termly pre-passivating treatment to realize corrosion resistance of the tubing-casing annulus. The method is convenient, feasibleand low in cost.
Description
Technical field [0001] The invention relates to the field of pipeline anticorrosion, in particular to an anticorrosion method for the annulus of a packer completion gas well oil casing. Background technique [0002] During the completion of oil and gas wells, the annulus between the tubing and casing (ie, the annulus of the oil casing) needs to be sealed by a packer to prevent the natural gas in the oil layer from entering the annulus of the oil casing and causing corrosion. In order to further ensure the anti-corrosion effect of the oil sleeve annulus, it is also necessary to inject annulus protection fluid into the oil sleeve annulus to reduce the corrosion of the oil sleeve annulus and extend the service life of the oil pipe and casing. However, with the development of oil and gas wells, packers are prone to deformation and failure, and oil pipes and threads will also leak, which will cause the oil sleeve annulus to communicate with the inside of the oil pipe, resulting in abn...
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IPC IPC(8): C23F11/14
Inventor 余华利陈文谷坛窦丽媛江晶晶黄刚华
Owner PETROCHINA CO LTD
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