Seamed net fracturing technological method

• Main Authors: MA JINLIANG, TIAN SHENGMIN, WANG LIN, ZHANG SHILIN, HUANG DEHUI, CAO NING, HU YONGXIONG
• Format: Patent
• Language: English
• Published: 10.02.2016
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

The invention discloses a seamed net fracturing technological method. The method includes the following steps that 1, before fracturing, high-viscosity fracturing fluid (like linear gel) replaces a fractured interval in a wellhole; 2, low-viscosity fracturing fluid (like slickwater) is used in a wellhead, and the high-viscosity fracturing fluid in the wellhole is squeezed into the stratum at the pressure of being higher than formation fracture pressure; 3, after fracturing of the stratum, the low-viscosity fracturing fluid is used as fracturing fluid for construction; 4, the high sand ratio section where sand adding is to be ended or the final high sand ratio section is fractured, and the high-viscosity fracturing fluid is used for carrying sand; 5, sand adding is completed, clear water or the slickwater is used for replacement, and fracturing is ended. According to the method, the fluid with viscosity is used for fracturing the stratum first, an independent crack is formed by the stratum and the wellhole, it can be guaranteed that the crack has a sufficient width, a high-concentration propping agent is made to enter the crack smoothly, the supporting crack width of the root portion of the crack is increased, higher flow guiding capacity is achieved, and therefore higher oil and gas production is obtained.