Study On Hydrajet Fracturing Technology And Application In Zhong Yuan Oil-Field

Hydraulic jet fracturing technology is different from the conventional hydraulic fracturing. This technology synthesizes hydraulic perforation, hydraulic fracturing and drown out in casing tubing annulus. It can make fracture in the specified location, don't use the mechanical seal, and save time and reduce risk in operation. The new technology, which uses the unique feature of water jet to stimulate reservoirs, is applicable to low permeable straight well and horizontal well. It can achieve separate layer fracturing in single paragraph or multistage without the mechanical seal. It solves problems, such as casing deformation, small casing, tube channeling, poor oil-water layer, stress abnormal, which can't be reformed in layering, and provides safety simple fracturing technology for the complex well condition.Generally, reservoirs in Zhong Yuan oilfield are buried deep, the physical property of reservoirs is poor and formation temperature is high. After about 30 years of development, especially the water flood development, the condition of oil well and water well become more complex, owing to constant adjustment and implementation of the development program and reasons of the geology, engineering, management and others. In such reservoir, the conventional hydraulic fracturing already cannot satisfy the need of fine development. Therefore, research on fracturing technique used in the deep, low permeability and complex well conditions in this article, hydraulic jet fracturing technology has important significance on development of the mid -late field.In this paper, based on laboratory experiments and field application, we studied the mechanism of hydraulic jet fracturing, optimized thermostable and shearing resistance fracturing fluid for fracturing in complex well condition. At the same time , we improved tools of hydraulic jetting, optimized hydraulic jet fracturing strings and fracturing operation parameters. Fracturing technologies, suitable for complex well condition reservoirs in deep zone and low permeability condition, was created and proved successful in practice. Such fracturing technologies provide technical support for increasing production of complex well conditions in Zhong Yuan oil-field in the next step.