Method for preparing light fracturing propping agent for multi-hole oil and gas well

[0015] Example 1: 10 Kg of uncalcined bauxite, 1.2 Kg of uncalcined limestone, 0.2 Kg of bentonite, and 0.1 Kg of starch were weighed with an alumina content of 70 wt%. The raw material mixture is poured into a ball mill for grinding, and the passing rate of the ground fine powder through a 300-mesh sieve is 95%. Then put the ground fine powder into the disc ball forming machine, add appropriate amount of water in batches, turn it into balls, and obtain the proppant ceramsite green body. Place the proppant ceramsite green body in well-ventilated air to dry naturally. Then put it into a rotary kiln and heat it up to 1350°C at a rate of 30°C/min for 20 minutes for sintering. After cooling down, the proppant sintered body is obtained, and then it is classified and screened through a 20-mesh and 40-mesh screen to remove oversized and undersized particles. particles, resulting in a lightweight and porous proppant. The performance of the proppant is as follows, the bulk density is 1.11g/cm 3 , the apparent density is 2.51g/cm 3 , The crushing rate under 52MPa is 15.7%, the roundness and sphericity are both 0.9, the acid solubility is 5.2%, the turbidity is 40FTU, and the single particle open porosity is 35%.

[0016] Example 2: Take 10Kg of uncalcined bauxite, 1.5Kg of uncalcined dolomite, 0.3Kg of kaolin, and 0.08Kg of dextrin with an alumina content of 62 wt%. The raw material mixture is poured into a vibration mill for grinding, and the passing rate of the ground fine powder through a 300-mesh sieve is 90%. Then put the ground fine powder into a high-speed ball forming machine, add an appropriate amount of water in batches, turn it into balls, and obtain the proppant ceramsite green body. Put the proppant ceramsite green body into a drying oven at 150°C for drying and dehydration. Then put it into a tunnel kiln and heat it up to 1300°C at a rate of 20°C/min for 1 hour for sintering. After cooling down, the proppant sintered body is obtained, and then it is classified and screened through 20 mesh and 40 mesh screens to remove oversized and undersized particles. particles, resulting in a lightweight and porous proppant. The performance of the proppant is: the bulk density is 1.27g/cm 3 , the apparent density is 2.58g/cm 3 , The crushing rate under 52MPa is 10.1%, the roundness and sphericity are both 0.9, the acid solubility is 5.8%, the turbidity is 50FTU, and the single particle open porosity is 33%.

[0017] Example 3: Take 10Kg of uncalcined bauxite, 1.2Kg of uncalcined magnesite, 0.5Kg of bentonite, 0.3Kg of kaolin and 0.1Kg of starch with an alumina content of 50 wt%. The above-mentioned raw material mixture was poured into a ball mill for grinding, and the passing rate of the ground fine powder through a 300-mesh sieve was 88%. Then put the ground fine powder into the disc ball forming machine, add appropriate amount of water in batches, turn it into balls, and obtain the proppant ceramsite green body. Put the proppant ceramsite green body into a drying oven at 200°C for drying and dehydration. Then put it into a rotary kiln and heat it up to 1350°C at a rate of 40°C/min for 20 minutes for sintering. After cooling down, the proppant sintered body is obtained, and then it is classified and screened through a 20-mesh and 40-mesh screen to remove oversized and undersized particles. particles, resulting in a lightweight and porous proppant. The performance of the proppant is: the bulk density is 1.08g/cm 3 , the apparent density is 2.38g/cm 3 , The crushing rate under 52MPa is 15.6%, the roundness and sphericity are both 0.9, the acid solubility is 6.5%, the turbidity is 34FTU, and the single particle open porosity is 42%.