Volume 36 Issue 6
Dec.  2019
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2019  >  36(6): 777-781,788
LIU Peipei. Study and Application of an Easy-to-flowback and Water Block Preventive Slick Water Fracturing Fluid for Tight Gas Reservoirs[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(6): 777-781,788. doi: 10.3969/j.issn.1001-5620.2019.06.021
Citation: LIU Peipei. Study and Application of an Easy-to-flowback and Water Block Preventive Slick Water Fracturing Fluid for Tight Gas Reservoirs[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(6): 777-781,788. doi: 10.3969/j.issn.1001-5620.2019.06.021
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Study and Application of an Easy-to-flowback and Water Block Preventive Slick Water Fracturing Fluid for Tight Gas Reservoirs

doi: 10.3969/j.issn.1001-5620.2019.06.021

  • Oil & Gas Engineering Institute, Petrochina Jilin Oilfield Company, Songyuan, Jilin 138000

  • Received Date: 2019-10-08
  • Publish Date: 2019-12-30
    Abstract
  • The tight gas reservoir in Jilin Oilfield, a low porosity and low permeability gas reservoir, is full of micrometer-and nanometer-sized pores with narrow pore throats and poor connectivity. Long period of development of this gas reservoir has resulted in reduction of formation pressures and productivity. Water block of the reservoir formations is aggravating and making flow back after fracturing more and more difficult. Swelling and migration of clay particles inside the formation caused blocking of the flow channels, further reducing the effective permeability of the reservoir and restricting the increase of oil recovery. A slick water fracturing fluid has been developed to address these problems. This slick water fracturing fluid is able to prevent water block and is easy to be flowed back after fracturing job. It is mainly composed of the drag reducer XY-205, a nanometer micro emulsion cleanup additive and the clay stabilizer XY-63. Laboratory experiments showed that this fracturing fluid has the properties of instant dissolving and low viscosity, which are beneficial to fast and continuous mixing. Friction reduced using this fracturing fluid was at least 70%. This slick water fluid has surface tension that is 40% lower than the surface tension of the slick water fracturing fluids used in other gas wells, indicating that the slick water is beneficial to the clean-up of the well after fracturing job. The slick water fracturing fluid is also useful in inhibiting clay swelling, the permeability of cores tested with this slick water fracturing fluid was only reduced by 9.45%, and the recovery of the permeability of the cores 24 hours after test was nearly 90%. Application of this slick water fracturing fluid on 4 wells gave 100% rate of success. Fracturing fluid flowed back was increased by a factor of 2. In well test, gas production rate was increased remarkably. This slick water fracturing fluid has good prospects of large-scale promotion and application

     

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