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Soluble acid-resistant aluminum alloy oil pipe, preparation method thereof and aluminum alloy thereof

A technology of aluminum alloy and tubing, applied in the direction of drill pipe, casing, manufacturing tools, etc., can solve the problems of tubing failure, delay of production well commissioning time, workover costs, sidetracking processing difficulties, etc., so as to avoid the task of salvaging tubing, Reduce the difficulty and cost of operation and meet the effect of corrosion resistance

Active Publication Date: 2020-01-17
优模(上海)新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the failure of unsealing of the open hole packer, the corrosion and breakage of the pipe string, and the collapse of the well wall, the tubing cannot be pulled out after a production cycle is completed, which makes it difficult to deal with sidetracking in the later stage, delays the production well start-up time, and incurs a large amount of workover costs

Method used

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  • Soluble acid-resistant aluminum alloy oil pipe, preparation method thereof and aluminum alloy thereof
  • Soluble acid-resistant aluminum alloy oil pipe, preparation method thereof and aluminum alloy thereof

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preparation example Construction

[0038] see figure 1 , the present invention also provides a preparation method of a soluble acid-resistant aluminum alloy oil pipe, comprising the following steps:

[0039] S1: In terms of weight percentage, Cu: 3.8-4.9%, Mn: 0.3-0.9%, Mg: 1.2-1.8%, Ni: 0.4-0.6%, Fe: 0.05-0.1%, and the rest are Al and impurities. Smelting and refining to obtain ingots;

[0040] S2: Heating the ingot for homogenization treatment, improving the crystal structure inside the alloy, eliminating casting stress and reducing segregation;

[0041] S3: extruding the homogenized ingot into a pipe at a temperature of 420-450°C, an extrusion rate of 3-5mm / s, and an extrusion ratio of 5-25;

[0042] S4: performing solution treatment on the extruded pipe;

[0043] S5: Perform acid-resistant coating treatment on the inner wall of the pipe after solution treatment.

[0044] The aluminum alloy oil pipe provided by the present invention includes a soluble pipe material and an acid-resistant coating on the inne...

Embodiment 1

[0064] This embodiment provides a soluble acid-resistant aluminum alloy for oil pipes, its chemical composition includes: Cu: 3.85%, Mn: 0.65%, Mg: 1.6%, Ni: 0.5%, Fe: 0.08%, The remaining components are Al and unavoidable impurities, and the Si content of the impurities is not more than 0.1% of the total weight of the aluminum alloy.

[0065] The manufacturing process steps of the above-mentioned soluble acid-resistant aluminum alloy tubing are as follows: the above-mentioned raw materials are smelted and refined outside the furnace and then cast to obtain ingots, and the ingots are heated to 450°C in a heating furnace for homogenization treatment, and the holding time is 6 hours; casting The extrusion temperature of the ingot is 435°C, the extrusion ratio is 18.3, and the extrusion speed is 3mm / s; the solution treatment temperature is 360°C, and the holding time is 3 hours.

[0066] The inner wall of the pipe after solid solution treatment is subjected to the following elect...

Embodiment 2

[0076] The present invention is an aluminum alloy for soluble acid-resistant aluminum alloy oil pipe, its chemical composition includes: Cu: 4.28%, Mn: 0.86%, Mg: 1.45%, Ni: 0.6%, Fe: 0.06%, and other components in weight percentage It is Al and inevitable impurity Si, and the content of impurity Si is not more than 0.1% of the total weight of the aluminum alloy.

[0077] The manufacturing process steps of the above-mentioned soluble acid-resistant aluminum alloy tubing are as follows: the above-mentioned raw materials are smelted and refined outside the furnace and cast to obtain ingots, and the ingots are heated to 435°C in the heating furnace for homogenization treatment, and the holding time is 7 hours; casting The extrusion temperature of the ingot is 425°C, the extrusion ratio is 16, and the extrusion speed is 5mm / s; the solution treatment temperature is 360°C, and the holding time is 3.5 hours.

[0078] The inner wall of the pipe after solid solution treatment is subjecte...

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Abstract

The invention discloses a soluble acid-resistant aluminum alloy oil pipe, a preparation method thereof and aluminum alloy thereof. The oil pipe comprises an oil pipe material and an acid-resistant coating on the inner wall of the pipe material, wherein the oil pipe material is made of aluminum alloy; and the aluminum alloy comprises the following components in percentage by weight: 3.8 to 4.9% ofCu, 0.3 to 0.9% of Mn, 1.2 to 1.8% of Mg, 0.4 to 0.6% of Ni, 0.05 to 0.1% of Fe and the balance Al and impurities. The preparation method for the pipe material comprises the following steps of: smelting and refining the components to obtain a cast ingot; heating the cast ingot for homogenization treatment; extruding the homogenized cast ingot into the pipe material; performing solution treatment on the extruded pipe material; and finally, performing acid-resistant coating treatment on the inner wall of the pipe material subjected to the solution treatment. The oil pipe material can be dissolved in formation water, so that the task of fishing the oil pipe after production can be completely avoided; the inner wall of the pipe material is acid-resistant, so that the problem of corrosion, breakage and separation of the pipe wall is solved; and the oil pipe can be used as a pipeline for conveying acid liquor, and the strength meets the strength requirements of oil well formation and operation.

Description

Technical field [0001] The invention belongs to the field of oil pipe manufacturing, and in particular relates to a soluble acid-resistant aluminum alloy oil pipe and its preparation method and aluminum alloy. Background technique [0002] Tahe Oilfield is a large integrated carbonate oil and gas reservoir discovered by the Northwest Petroleum Bureau. It has strong heterogeneity, deep burial (5400-5900m), high formation pressure (58-61.7MPa), and high salinity (stratum Water contains Cl-, HCO 3 -,CO 3 2 -, OH-, SO 4 2 -, Br-, I-, K+, Na+, Mg 2 +, Ca 2 +) and high temperature (120℃-160℃). Except for a few oil wells that encounter caves and fracture zones and form natural productivity, most wells must undergo acid fracturing to connect the wellbore with caves and fracture zones to gain productivity. [0003] At present, the pipelines used to transport acid liquid are traditional oil and gas resource production pipe strings. Commonly used corrosion-resistant alloy oil p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/16C22F1/057C21D9/08C25D3/46C25D5/44C23C18/31C23C28/02E21B17/00B21C23/00B21C23/08B05D7/22
CPCB05D7/222B05D2506/15B21C23/002B21C23/085C21D9/08C22C21/16C22F1/057C23C18/31C23C28/025C25D3/46C25D5/44E21B17/00
Inventor 王鑫王锋华董帅董杰
Owner 优模(上海)新材料科技有限公司
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