Abstract
In-fissure divert fracturing technology, in which diverting agent is added. It can create new branch fractures and micro fractures, increase the area of fluid-release and achieve the goal of production and injection increase. This paper introduces a new diverting agent material with different kinds of petroleum resins. A series of evaluation including compatibility, efficiency and dissolved time was put forward. The results showed that the soluble rate of this agent is from 6 h to 12h and with increasing temperature and prolonging dissolved time, soluble rate reach 96% at 110° indicated good solubility. The critical flow velocity of sand production increases more than 30 ~ 60 times with adding fiber. The highest breakthrough pressure can reach 0.5MPa in 10 cm cores containing 9‰ diverting agent in the fracturing fluid. Meanwhile, it has minimal impact on flow conductivity .It had good flow back after treatment the viscosity was 13-54 mPa.s. Moreover, a special instrument was introduced to evaluate the performances of fracture conductivity and diverting. More than 24 treatments with this new material in X oil field have been performed with encouraging results with an average post-fracturing rate 11m 3 /d. It has great influences on new chemical material for improving complex fractures net-work of hydraulic fracturing in tight oil and gas reservoirs.
Highlights
Tight oil is a petroleum play that consists of light crude oil contained in petroleum-bearing formations of low permeability, often shale or tight sandstone
After application of eight wells was successfully carried out, the result shows that the new diverting materials meet the demand of in-fissure divert fracturing technology and achieve the goal of production
The product field application time in more than 10 Wells shows that the diverter oil-soluble reached more than 95%, over the construction of combined with proppant to effect is increased by 1.5 times, after transforming effect is increased by 2.1 times, to improve crack under the unconventional reservoir volume fracturing model complexity choice to provide new material
Summary
Tight oil is a petroleum play that consists of light crude oil contained in petroleum-bearing formations of low permeability, often shale or tight sandstone. Temporary plugging agent is one of the key technology for in-fissure divert fracturing, most of the plugging agent is oil-soluble, and is not suitable for the high water cut oil wells and injection wells In this paper, we obtained a new diverting agent named Zn-1 based on original diverting materials. This diverting agent material can improve the effect of diverting. It can be provided as a new technological in the construction of high temperature wells, complicated wells and other wells with sand-adding difficulty
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