Abstract
What kind of drainage system should be adopted after the volumetric fracturing of the glutenite reservoir in the Mahu 1 well area, lack of systematic research. The reasonable choice of the size of the nozzle is the key to determining the flow back of the fracturing fluid and stable production. By comparing the applicability differences of fracturing and drainage systems at home and abroad, this paper analyzes the production experience of neighboring areas and determines the overall principles of drainage system: small displacement principle, stable drainage principle and step-by-step amplification principle. Then, by calculating the rate of change of oil production, analyzing the system well test curve and production curve, and determining a reasonable drainage system, it is concluded that the volume of the glutenite reservoir after fracturing should be 1.5 mm small nozzle, and the pressure is gradually stabilized. The grade is replaced by a 2.5 mm nozzle. Most of the wells are finally stabilized in the 3.0 mm nozzle production. A small number of wells can be properly enlarged to a 3.5mm nozzle for stable production. Under the guidance of this understanding, the horizontal wells in the Mahu 1 well area have basically reached the design capacity, providing theoretical basis and guidance for the production practice after volume fracturing.
Highlights
The Mahu Oilfield in the Junggar Basin is proved to be an important oil and gas enrichment area
The fracturing fluid backflow calculation model can be used to calculate the fracture closing time corresponding to different nozzle sizes
According to the step-up principle, 1.5mm nozzles should be used in the initial well opening stage
Summary
The Mahu Oilfield in the Junggar Basin is proved to be an important oil and gas enrichment area. It is dominated by Permian and Triassic glutenite alluvial fans and fan delta-type oil and gas reservoirs [1]. Thearea between the Urho Formation in the upper Permian series and the Baikouquan Formation in the lower Triassic series forms a set of coarse-grained near-provenance sediments in the background of depression basins a set of coarse-grained near provenance sedimentation is formed under the background of depression basin [2] They are mainly composed of conglomerate-coarse sandstones, containing a small amount of fine ones. Based on the analysis of a large number of on-site mining test data, this paper obtains a reasonable drainage system rule, which can provide theoretical basis and guidance for production practice after volume fracturing in the Mahu Lake area
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