Study Of Low Density And Middle Strength Oil Fracturing Proppant

The fracturing technology is contribute to improve oil production.Oilfracturing proppant is a lot of solid particles which can prop up fractures, effectof properties of proppants on the fracturing result of oil and gas well productionis evident.Oil fracturing proppant is a lot of solid particles which can prop up fractures,effect of properties of proppants on the fracturing result of oil and gas wellproduction is evident.The developing situations of oil fracturing proppants are introduced in thispaper,the technical problems of internal low-density proppants is studied. Thelow-density and middle-strength oil fracturing proppant was prepared bytraditional method using bauxite, kaolinite, illite as main raw, talc and aluminumfluoride as mineralizers, its content of Al2O3is60wt%~65wt%. The influencesof raw material matching, mineralizers, size, firing temperature and holding timeon the properties were studied, the phase composition and microstructure of theproppant were investigated by XRD and SEM. The paper obtains the followingmain conclusions:(1)The low-density and middle-strength oil fracturing proppant usingbauxite, illite and kaolinite as the main raw materials was prepared through theoptimization of formulation and process of raw materials under1320℃~1360℃,its quality indicators such as density, strength and acid resistance meet nationalstandards.(2)The sintering temperature,density, strength and acid resistance wasincreased as the increase of bauxite content in proppant.(3)The sintering temperature and density of proppant was reduced when asmall amount of talc as the mineralizer. When bauxite content was62wt%, illitewas26wt%, kaolinite was12wt%, the best addition of talc was2wt%. (4)The strength and acid resistance of proppant was improved when a smallamount of aluminum fluoride as the mineralizer. When bauxite content was62wt%, illite was26wt%, kaolinite was12wt%, the best addition of aluminumfluoride was2wt%.(5)The properties of proppant was affected by the firing process systemunder the condition of the same formula, the strength of proppant was highernear the lower limit of the sintering temperature range, suitable hightemperature insulation can improve the strength and acid resistance of theproppant, and the density was increased slightly.(6)The reduce of the particle fineness of raw materials can promotesintering of proppant and can improve the strength and acid resistance of theproppant, when the formula is bauxite66wt%, illite26wt%, kaolin8wt%, talc2wt%, and the average particle size of the raw materials is2.802μm, thesample has a higher strength and a better acid resistance under1340℃for1h, thesample met the property requirements of low-density and middle-strength oilfracturing proppant, its apparent density was2.79g/cm~3, its damage rate was8.72%under52MPa closed pressure, its acid solubility was4.5%.