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Lab Research and Filed Experience of HDPE-Lined Tubing used in Nitrogen Injection Well

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The tubing of nitrogen injection well suffered heavily corrosion due to nitrogen containing 2%~5% oxygen HDPE-lined tubing was employed as one of the cost-effective measures to mitigate tubing corrosion. Two kinds of HDPE liner with white and black colors were selected as candidates for tubing liner used in nitrogen injection well performance of two HDPE liners were characterized under three conditions including as-received (A) after one month immersed in simulated oxygen-containing water under elevated temperature (B) half-year serviced in field downhole environment (C). The values of vicat softening temperature of red and blue HDPE liners are 84.5℃ and 82.6℃ respectively the vicat softening temperature is known as the key parameter for non-metallic material selection.In lab test the elongation after fracture tensile strength micro-morphology of HDPE liners tested in condition B (80℃) is almost identical to condition A; while the elongation is substantially lost in condition B (100℃) the general appearance of two liners is still white and black but several cracks were observed on both HDPE liners by microscope; two liners are full with cracks in condition B (120℃) and the elongation is totally lost the general appearance of two liners is both black due to carbonizing; the two liners are further carbonized in condition B (140℃) only small pieces were founded after test.It is found that the white HDPE liner is better than black liner white HDPE lined tubing was selected for nitrogen injection well seven tubing sections used for nitrogen injection well from bottom to top with temperature varied from 120℃ to 80℃. The liners of bottom three sections with temperature from 110℃ to 120℃ are totally fallen off only tubing body with heavily corrosion and corrosion products were observed. The liners of middle three sections with temperature from 97℃ to 88℃ are cracked which are still adhered to the tubing body the color is black due to carbonizing. The liner of the top one section with temperature of 80 ℃ is still in intact condition the values of vicat softening temperature in condition A condition B (80℃) and condition C (80℃) are 84.5℃ 82.6℃ and 79.8℃ the values of elongation after fracture are 511.25 430.88 and 511.20 the values of tensile strength are 29.82MPa 23.56MPa and 23.42MPa. It is can be seen that the lab simulated test are highly in accordance with the field test results which provided a good guidance for the selection of HDPE liner for nitrogen injection well.

Product Number: 51319-13346-SG
Author: An Qing Fu
Publication Date: 2019
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