This paper considers the results of geophysical logging of multi-layer pumping wells with a bypass system of ESP units. Multi-layer production well testing with Y-tool assembly supports logging under commercial operation upon achievement of a steady-state flow regime. Here, several formations within the field are being operated. Testing of flooding in a low permeability reservoir takes place when injection pressure is higher than the formation fracturing pressure of self-induced fracturing. Downhole logging in multi-layer wells with bypassing of ESP units is used to determine flooded formations where self-induced fracturing takes place. This approach is essential to plan activities to decrease water-cut in multi-layer production wells with injected liquid breakthroughs. In the course of the study, certain field regions with considerable undrilled reserves were found in various formations. The risk of wellbores intersection with dynamically induced fractures in injection wells must be considered with regards to kick-offs of horizontal sidetracks and other well completions. This paper presents the results of numerical simulation using the reservoir model of a development element configuration with a long auto hydraulic fracture and several horizontal wells (HW) with multi-stage hydraulic fractures drilled perpendicular to a fracture in an injection well. Susceptibility to reservoir permeability, number of fractures in HW with multi-stage hydraulic fractures and a distance between fractures were analyzed.

Development of low-permeability reservoirs leads to intensive flooding at high pressure injection. The induced fracture length extends when the injection pressure exceeds the formation fracturing pressure. In a number of cases, the length of induced fracture can reach 1000 m and even more. This results in high water-cut in adjacent producers. Moreover, during sidetracking, repeated fracturing, drilling a new hydraulically fractured directional or horizontal well, etc., a high pressure in the producer and a high water-cut can arise. It can be due to the spontaneous fracturing from neighboring wells as well as from injectors of adjacent elements of field development system. Thus, the number of injectors, which could potentially lead to the high water-cut / the high pressure in the well, is quite large. In order to find such injector, interference tests, dynamic data analysis (correlation of injection rate, production rate, and water-cut) should be carried out as well as data analysis during the steady-state injection tests in the adjacent injectors. The advantages and disadvantages of the methods, as well as the matrix of the step-by-step application of methods are discussed in the paper. Furthermore, the trajectory of spontaneous fracturing is simulated using the geomechanical simulator, which is implemented in the geomechanical module ("RN-KIN"). It can be useful for interference tests when it is necessary to identify the most likely candidate wells for the rating, and find the optimal set of priority active injectors. This helps one to reduce the number of wells in the research program that leads to the reduction of losses in the injection/production. Thus, the proposed approach can significantly reduce the cost and losses in the injection/production during the interference-tests.

No abstract

The research is devoted to a discussion of the impact of fracture parameters in the curves of changes in pressure and flow rate of the injected fluids during hydrodynamic studies by established pumping regimes in the injection well with a crack fracturing. Modeling was performed at various parameters of the layer and technogenic fracture. Researched variety of deviation cases from the researched technology, in particular, untimely transition from one mode to another, a violation of the mode sequences and etc.

No abstract