Ann field fracturing sand plug factor analysis and solution

Ann profile field work area proppant sand manufacturers is the key exploration area of henan oilfield in recent years, in the south and discuss basin in biyang Zhao Ao - shed nose-like structure belt in southeast, Ann for underwater branch of fan delta front facies flow channel and front sand deposits. Reservoir geological characteristics indicate that Ann tent oilfield is characterized by deep buried depth (2 800 ~ 3 800 m), high temperature (90 ~ 140 ℃), the average permeability is 1.81 x 10-3 mu m2, average porosity of 5.2%, belong to the typical high temperature and high pressure, low porosity, low permeability fractured sandstone reservoirs. Its natural reservoir capacity is low, must be conducted by fracturing to industrial development. The formation of natural fracture development, the average fracture density is 0.57 / m, natural gas fracturing average length of 0.16 m. The existence of microcracks caused by fracturing fluid filtration, easy cause sand plug. In-situ stress and the study of the physical and mechanical properties of rocks show that Ann field horizontal maximum principal stress direction for north east 81 ￣ 93 °. Nearly east-west, level of minimum principal stress gradient averaged 0.016 0 MPa/m, high ground stress, formation fracture pressure is higher, to some extent, increased the difficulty of fracturing operation. A principle is put forward according to the geological characteristics of low damage organic boron hydroxypropyl guar water-based fracturing fluid system, the use of the linear sand and crack closure techniques such as fracturing technology