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Polyester acid-resisting high-pressure for composite pipe for oil field use and producing process thereof

An ultra-high pressure, composite pipe technology, applied in the pipeline field, can solve the problems of not meeting the requirements, poor corrosion resistance, unstable concentration, etc., and achieve the effect of good low temperature resistance

Active Publication Date: 2008-05-21
张春建
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, the pipelines used in oilfields for high-pressure transportation of high-concentration sulfuric acid and hydrochloric acid are made of rubber materials. During use, the pipelines made of this material have high water absorption (about 0.5%) and poor corrosion resistance. , so that the high-concentration sulfuric acid and hydrochloric acid transported have the defect of unstable concentration due to the water absorption of the pipe wall
In addition, the environmental and geological conditions of the oil field are relatively complex, requiring the pipes used to have wide weather resistance (rubber material pipes can only be used in the environment of minus 20°C-50°C), and should also have good The tensile and bending properties of rubber materials can not meet the requirements, and the service life is generally only 6-8 months

Method used

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  • Polyester acid-resisting high-pressure for composite pipe for oil field use and producing process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. Preparation of inner tube

[0038] The first step: Weigh 200Kg of PE plastic as the main material, 0.03Kg of barium stearate as lubricant, 0.05Kg of phthalic acid and 0.05Kg of chlorinated paraffin as plasticizer, and 0.06Kg of dibasic lead sulfate as Heat stabilizer and 0.12Kg of titanium dioxide raw materials;

[0039] The second step: make the above raw materials into granules and put them into the hopper of the extruder;

[0040] Step 3: Heating the extruder and extruding it into the mixing heating zone with temperatures of 180°C, 215°C and 240°C in sequence;

[0041] Step 4: Injection molding, sealing the inner cavity of the outlet tube, and putting it into the vacuum cavity to make the outlet tube round, and cooling it with room temperature water to shape it;

[0042] The fifth step: out of the vacuum cavity.

[0043] 2. Preparation of reinforcement layer

[0044] Wrap 4 layers of wires on the outer wall of the formed inner tube with a wire winding machine ...

Embodiment 2

[0050] Embodiment 2: the PE plastics of major ingredient 200Kg, the lead stearate of 0.05Kg make lubricant, the phthalic acid of 0.02Kg, the chlorinated paraffin of 0.07Kg and the alkyl sulfur phenyl ester of 0.06Kg make plasticizer, 0.07Kg of dibasic lead phthalate as heat stabilizer and 0.15Kg of talcum powder.

[0051] Heating the extruder and extruding it into a mixing heating zone with temperatures of 195°C, 230°C and 240°C in sequence;

Embodiment 3

[0052] Embodiment 3: the PE plastics of major ingredient 200Kg, the lead stearate of 0.04Kg make lubricant, the petroleum sulfur phenyl ester of 0.04Kg, the chlorinated paraffin of 0.03Kg and the alkyl sulfur phenyl ester of 0.05Kg make plasticizer, 0.10Kg of liquid barium composite heat stabilizer and 0.14Kg of titanium dioxide.

[0053] Heating the extruder and extruding it into a mixing heating zone with temperatures of 190°C, 220°C and 240°C in sequence;

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Abstract

The invention consists in: using PE plastics, lubricant, plasticizer and heat stabilizer as the main material; preparing inner pipes with a 2-6 mm thickness by the process of heating extruding by an extruder and cooling molding; forming a reinforced layer wound by a winding machine; putting low density polyethylene, inhibitor, low-temp. resisting agent, plasticizer and fire retardant as the raw material in the cladding machine; and cladding a layer of outer pipes.

Description

technical field [0001] The invention belongs to the technical field of pipelines, and specifically discloses a polyester acid-resistant ultra-high pressure composite pipe for oil fields with low water absorption and good tensile and bending resistance properties and a preparation process thereof. Background technique [0002] At present, the pipelines used in oil fields for high-pressure transportation of high-concentration sulfuric acid and hydrochloric acid are made of rubber materials. During use, the pipelines made of this material have high water absorption (about 0.5%) and poor corrosion resistance. Therefore, the concentration of the high-concentration sulfuric acid and hydrochloric acid being transported is unstable due to the water absorption of the pipe wall. In addition, the environmental conditions and geological conditions of the oil field are relatively complex, requiring the pipes used to have a wide weather resistance (rubber material pipes can only be used i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L9/147C08L23/06B32B37/00
Inventor 张春建李明
Owner 张春建