A kind of magnesium alloy for making soluble fracturing ball and its preparation method
A technology of magnesium alloy and fracturing ball, which is applied in the field of manufacturing magnesium alloy for soluble fracturing ball and its preparation, can solve the problems of deformation and jamming into the ball seat, difficulty in flowback, low density, etc., so as to overcome jamming, promote Dissolving, low density effect
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Embodiment 1
[0029] This embodiment provides a magnesium alloy for manufacturing soluble fracturing balls, the magnesium alloy includes the following components in parts by mass:
[0030] Zn 5.0~8wt.%;
[0031] Ca 2.0~7wt.%;
[0032] Nd 0.5~4 wt.%;
[0033] FeCl 3 0.2~2wt.%;
[0034] Cu 0.5~2wt.%;
[0035] Ni 0.5~2wt.%,
[0036] The balance is Mg, and the sum of the parts by mass of the above components is 100%.
[0037] The above-mentioned magnesium alloy is used to produce fracturing balls and bridge plug separation tools used in the process of fracturing reconstruction in oil and gas fields.
[0038] Experiments show that the magnesium alloy material prepared by the present invention and used for making soluble fracturing balls is composed of grain phase and network grain boundary phase. Due to the potential difference between the grain phase and the grain boundary phase, when the alloy exists in a solution containing an electrolyte, at the interface of the alloy, countless micr...
Embodiment 2
[0041] This embodiment provides a method for preparing a magnesium alloy for manufacturing a soluble fracturing ball, comprising the following steps:
[0042] (a) Weigh the pure metals of Mg, Ca, Nd, Zn, Cu, Ni (Mg, Ca, Nd, Zn, Cu , the purity of Ni metal ≥ 99.9%), in the protective gas (helium, argon or SF 6 +CO 2 A kind of mixed gas) under the condition of smelting into alloy liquid, after the alloy liquid is stirred evenly at 720-750 °C, add anhydrous FeCl preheated at 180-250 °C for 3-6 hours 3 After heating up to 750-780°C, continue to stir for 30-50 minutes, pour the alloy solution into a low-carbon steel mold preheated to 100-200°C at 680-720°C, and cool it in the air to form a cast alloy;
[0043] (b) Machine the cast alloy obtained in step (a) into a cylinder, put it into a heat treatment furnace and heat it to 380-420°C for heat preservation, and perform hot extrusion treatment after 4-8 hours. The hot extrusion temperature: 380-420°C, the extrusion ratio: 5-20, t...
Embodiment 3
[0046] Magnesium alloy 84.25Mg-6Zn-5Ca-2.5Nd-0.25FeCl 3 Preparation of -1Ni-1Cu:
[0047] (a) Weigh the pure metals of Mg, Ca, Nd, Zn, Cu, and Ni in the set mass fraction, in the protective gas of 0.5%SF 6 +99.5%CO 2 smelting at 740°C, after the alloy liquid was stirred evenly at 740°C, anhydrous FeCl preheated at 200°C for 4 hours was added 3 After raising the temperature to 760°C, continue to stir for 30 minutes, pour the alloy liquid into a low-carbon steel mold preheated to 100°C at 700°C, and cool it in the air.
[0048] (b) Machining the as-cast alloy obtained in step (a) into a cylinder, putting it into a heat treatment furnace and heating it to 400° C. for heat preservation, and performing hot extrusion treatment after 6 hours. Hot extrusion temperature: 400°C, extrusion ratio: 10.9, extrusion speed: 10 mm / min.
[0049] 84.25Mg-6Zn-5Ca-2.5Nd-0.25FeCl obtained by the above method 3 -1Ni-1Cu magnesium alloy material, its engineering stress-strain curve is as follows...
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