阅读说明：本技术 一种低密度石油压裂支撑剂及制备方法 (Low-density petroleum fracturing propping agent and preparation method thereof ) 是由 司峻山 贺永利 于 2019-09-24 设计创作，主要内容包括：本发明公开了一种低密度石油压裂支撑剂及其制备方法,属于石油压裂支撑剂技术领域。该低密度石油压裂支撑剂由轻烧铝矾土、膨润土、轻烧镁粉、锰粉、过烧回用粉、硅灰以及低铝粉煤灰制备而成。本发明还公开了上述低密度石油压裂支撑剂的制备方法,该方法包括配料、制浆、均化、烘干、造粒、筛分,并将过烧坯球粉碎后作为过烧回用粉使用,减少了原料浪费的问题,同时降低了产品的密度,提升了产品的稳定性及其强度,资源化使用,利于大规模生产。(The invention discloses a low-density petroleum fracturing propping agent and a preparation method thereof, and belongs to the technical field of petroleum fracturing propping agents. The low-density petroleum fracturing propping agent is prepared from light-burned bauxite, bentonite, light-burned magnesium powder, manganese powder, overburning recycled powder, silica fume and low-alumina fly ash. The invention also discloses a preparation method of the low-density petroleum fracturing propping agent, which comprises the steps of proportioning, pulping, homogenizing, drying, granulating and screening, and the calcined blank balls are crushed and then used as calcined recycling powder, so that the problem of raw material waste is reduced, the density of the product is reduced, the stability and strength of the product are improved, the resource utilization is realized, and the large-scale production is facilitated.)

1. The low-density petroleum fracturing propping agent is characterized by being prepared from the following components in percentage by mass:

4 to 6 percent of light-burned bauxite, 6 to 8 percent of bentonite, 0.8 to 1.2 percent of manganese powder, 0.8 to 1.2 percent of light-burned magnesium powder, 0.4 to 0.6 percent of silica fume, 0 to 0.5 percent of over-burned recycled powder and the balance of low-aluminum fly ash.

2. The low density petroleum fracturing proppant of claim 1, wherein the light calcined bauxite contains Al₂O₃The mass percentage content of the compound is 70-75 percent; in the bentonite, the mass percentage of the montmorillonite is 85-90%; in the low-aluminum fly ash, Al₂O₃33.08 to 50.10 percent of SiO₂35.10 to 42.67 percent of Fe₂O₃The mass percentage of the CaO is 1.8-4.0%, and the mass percentage of the CaO is 8-12%; the light-burned bauxite, the bentonite, the manganese powder, the light-burned magnesium powder, the low-aluminum fly ash and the silica fume are sieved by a 200-mesh sieve.

3. A preparation method of a low-density petroleum fracturing propping agent is characterized by comprising the following steps:

s1: adding the low-aluminum fly ash crude product into a straight tube ball mill, removing large materials, and sieving with a 200-300-mesh sieve to obtain low-aluminum fly ash ball milled powder;

s2: weighing the following raw materials in percentage by mass: 4 to 6 percent of light-burned bauxite, 6 to 8 percent of bentonite, 0.8 to 1.2 percent of manganese powder, 0.8 to 1.2 percent of light-burned magnesium powder, 0.4 to 0.6 percent of silica fume, 0 to 0.5 percent of over-burned recycled powder from S6 and the balance of the low-aluminum fly ash ball-milled powder obtained in the step S1 are mixed and homogenized to obtain mixed powder, and then the mixed powder is mixed with water for pulping to obtain slurry;

s3: grinding the slurry obtained in the step S2 to 600-800 meshes in a ceramic ball mill to obtain superfine powder slurry, drying the superfine powder slurry in a dryer, drying 5-15 wt% of the superfine powder slurry to obtain dry powder with the moisture content of less than or equal to 2.0%, and drying the rest superfine powder slurry to obtain semi-wet powder with the moisture content of 7.5-8.5%;

s4: adding water to spray the dry powder and the semi-wet powder obtained in the step S3 in a granulator, granulating and forming to obtain semi-finished blank balls, wherein the granulation and forming time is 1.4-1.6 h, drying the semi-finished blank balls, classifying and screening according to particle size to respectively obtain qualified blank balls, large-particle blank balls and small-particle blank balls, crushing the large-particle blank balls to 600-800 meshes, mixing with the semi-wet powder obtained in the step S3, and returning the small-particle blank balls to the granulator for re-granulation;

s5, heating and sintering the qualified blank balls obtained in the step S4 in an automatic high-temperature resistance furnace or a rotary kiln by a program, wherein the sintering temperature is 1350 +/-20 ℃, the sintering heat preservation time is 0.8-1.2 h, and after the sintering is finished, naturally cooling to the normal temperature for 5h to obtain the sintered blank balls;

s6, screening the fired blank balls obtained in the step S5 step by step, firstly screening out under-fired blank balls through a color screening machine, then screening out over-fired blank balls through particle size, finally obtaining finished product blank balls, returning the under-fired blank balls to the step S5 for re-firing, punching and crushing the over-fired blank balls under 27-29 MPa, then vibrating and screening to obtain powder, and crushing the powder into 600-800 meshes through an ultrafine grinder as the over-fired recycled powder in the step S2;

and S7, grading and screening the screened finished product blank balls through a standard screen to obtain the low-density petroleum fracturing propping agent.

4. The method for preparing the low-density oil fracturing propping agent according to claim 4, wherein in step S2, the volume ratio of the mixed powder and the water mixed for pulping is 1: 1.5.

5. The method for preparing a low density petroleum fracturing propping agent according to claim 4, wherein in step S3, the passing rate of the superfine micro-powder slurry after being screened by a 600-mesh water screen is 90% -100%.

6. The method for preparing the low-density petroleum fracturing propping agent according to claim 4, wherein in step S4, when the dry powder and the semi-wet powder are subjected to water spray granulation and molding in the granulator, the mass percentage of the dry powder is 0-10%, and the mass percentage of the semi-wet powder is 90-100%.

7. The method of preparing a low density petroleum fracturing proppant of claim 4, wherein in step S4, said acceptable green pellets are those screened through any one of standard sieves ranging from 20 mesh to 40 mesh standard sieves, from 30 mesh to 50 mesh standard sieves, and from 40 mesh to 60 mesh standard sieves, said large-particle green pellets are those that cannot be screened through the upper limit of one of said standard sieves, and said small-particle green pellets are those that can be screened through the lower limit of one of said standard sieves.

8. The method for preparing the low-density petroleum fracturing propping agent according to claim 4, wherein in step S4, the semi-finished blank ball is dried until the moisture content is less than 2% and the drying temperature is 103-107 ℃.

9. The method for preparing the low-density petroleum fracturing propping agent according to claim 4, wherein in step S5, the temperature-programmed rate is 3 ℃/min to 5 ℃/min, and the temperature-programmed time is 5.8h to 6.2 h.

10. The method for preparing a low-density petroleum fracturing propping agent according to claim 4, wherein in step S6, said color screening machine marks the color of said qualified green balls as red and marks the color of said qualified green balls as green, said color screening machine screens out said green-marked green-.