A kind of low-permeability oil reservoir acid-sensitive self-generated temporary plugging and diverting agent and its preparation method and application
A low-permeability, oil-reservoir technology, applied in chemical instruments and methods, reagents, and earth-moving drilling and production, etc., can solve the problem of uneven water absorption in water injection wells, and achieve low plugging performance, improve uneven water absorption, and improve water drive. degree of effect
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Embodiment 1
[0036] This embodiment provides an acid-sensitive self-generated temporary plugging and diverting agent for low-permeability oil reservoirs, which is composed of the following weight percentages: 10-20% of sodium stearate, 6-15% of sodium humate, and 10.5% of silicate. ~25%, benzoate 8.5~11.5%, polyamino polycarboxy polymer 10~16%, surfactant 4~6%, potassium chloride 3-8%, and the rest is water.
[0037] Principle of the present invention:
[0038] The acid-sensitive self-generated temporary plugging and diverting agent for low-permeability oil reservoirs of the invention is pumped into the formation, enters the pores with different pore diameters of the formation respectively, automatically matches the size of the formation pore roar, and then pumps into the acid solution, and gradually enters the pores filled with the temporary plugging agent solution. Due to the low pH value, the main components of the temporary plugging agent react with the acid solution to form solid part...
Embodiment 2
[0044] On the basis of Example 1, this example provides an acid-sensitive self-generated temporary plugging and diverting agent for low-permeability oil reservoirs, which is composed of the following weight percentages: 10% of sodium stearate, 15% of sodium humate, Silicate 10.5%, benzoate 8.5%, polyamino polycarboxy polymer 10%, surfactant 6%, potassium chloride 3%, water 37%.
[0045] making process:
[0046] Step 1) The reaction kettle is heated to 30°C and kept at a constant temperature, followed by adding water, sodium stearate, sodium humate, silicate and benzoate in the formula amount, and stirring while adding;
[0047] Step 2) Add the formula amount of polyamino polycarboxy polymer and surfactant to the above solution in turn, then the temperature is raised to 40°C, and the temperature is uniformly stirred for 30 minutes;
[0048] Step 3) Add the formula amount of potassium chloride to the above solution, stir evenly, cool the solution to room temperature, and then w...
Embodiment 3
[0057] On the basis of Example 1, this example provides an acid-sensitive self-generated temporary plugging and diverting agent for low-permeability oil reservoirs, which is composed of the following weight percentages: 15% of sodium stearate, 10% of sodium humate, Silicate 15%, benzoate 10%, polyamino polycarboxy polymer 12%, surfactant 5%, potassium chloride 5%, water 28%.
[0058] making process:
[0059] Step 1) The reaction kettle is heated to 40°C and kept at a constant temperature, followed by adding water, sodium stearate, sodium humate, silicate and benzoate in the formula amount, and stirring while adding;
[0060] Step 2) Add the formula amount of polyamino polycarboxy polymer and surfactant to the above solution in turn, then the temperature is raised to 45°C, and the temperature is uniformly stirred for 35 minutes;
[0061] Step 3) Add the formula amount of potassium chloride to the above solution, stir evenly, cool the solution to room temperature, and then weig...
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