Bridging leaking stoppage slurry and preparation method thereof
A technology for bridging plugging and slurry leakage, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as poor temperature resistance, poor anti-channeling ability, low viscosity of plugging slurry, etc., to reduce complexity conditions, speed up drilling, and ensure drilling safety
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[0042] The preparation method of the gel adopts the method of Example 8 in Chinese Patent Publication CN106317321A, which specifically includes the following steps:
[0043] Add 17g of acrylamide, 4g of acryloxyethyltrimethylammonium chloride, 0.2g of N,N'-methylenebisacrylamide into 100g of water, stir to fully dissolve, add 4g of ammonium alginate, stir to fully dissolve, add 0.5g ultra-fine calcium carbonate, stir to fully disperse, add 1g ammonium persulfate and 1g acetic acid, stir to fully dissolve, and finally, put the mixed system at 55°C to react and form a gel after 2 hours.
Example Embodiment
[0044] Example 1
[0045] Formula: (unit is parts by weight)
[0046] Water: 100
[0047] Gel: 1
[0048] Calcium carbonate particles (1mm): 5
[0049] Walnut shell (0.5-1mm): 2
[0050] Suspension polymerization monoene-diene cross-linked gel resin (1mm): 0.5
[0051] Sepiolite fiber (0.5-1mm): 2
[0052] Mica (0.5mm): 2
[0053] Calcium carbonate powder (400 mesh): 5
[0054] Preparation method: mix the gel with water to make a gel solution, add the above-mentioned other materials to the gel solution separately, stir at 4500r / min for 10min, according to the above formula, prepare 1000mL gel plugging slurry for use.
[0055] Test method: Install a 1mm simulated fracture core in the DL-2 plugging instrument, fill the core cracks with 190g of asphalt, then add 1000mL gel plugging slurry and 1000mL drilling fluid to the DL-2 plugging instrument, and replace it with drilling fluid Gel plugging slurry. The simulated fracture core was heated to 120℃ and slowly pressurized. During the pressurizat...
Example Embodiment
[0056] Example 2
[0057] Formula: (unit is parts by weight)
[0058] Water: 100
[0059] Gel: 1
[0060] Clam shell powder (2mm): 6
[0061] Apricot shell (0.5-2mm): 2
[0062] EPDM and 4-tert-butyl styrene copolymer (1mm): 2
[0063] Aluminum silicate fiber (0.5-1mm): 2
[0064] Raw vermiculite (0.5mm): 2
[0065] Calcium sulfate powder (400 mesh): 5
[0066] Preparation method: mix the gel with water to make a gel solution, add other materials to the gel solution separately, stir at 4500r / min for 10 minutes, prepare 1000mL gel plugging slurry according to the above formula, and use it for later use.
[0067] Test method: Install a 2mm simulated fracture core in the DL-2 plugging instrument. The core cracks are filled with 380g asphalt. Then 1000mL gel plugging slurry and 1000mL drilling fluid are added to the DL-2 plugging instrument and replaced with drilling fluid. Gel plugging slurry. The simulated fracture core was heated to 120℃ and slowly pressurized. During the pressurization proc...
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