The Productivity Study Of Horizontal And Vertical Wells Pattern

Nowadays, the way of integral development with horizontal well and vertical well has been paid attention and already used in the actual oilfield, however, the study of combination of horizontal and vertical well is not mature. Normal five-spots pattern, normal seven-spots pattern and normal nine-spots pattern have been studied, but the study of productivity formula with the direction of horizontal well arbitrarily changed in inverted five-spots pattern, seven-spots pattern, inverted seven-spots pattern, nine-spots pattern and inverted nine-spots pattern has not been reported yet. This paper, by the theory of conformal transformation, imaging and superposition principle, completely studies the theory of combination of horizontal and vertical well and parameter optimization of well pattern, derives the calculating formulas for different combination of horizontal and vertical well and analyses influential factors.In this paper, using comprehensively the information of seismic, geology, well logging and etc, combined with geological characteristics in G1 oilfield blocks, the well network, horizontal length, well array direction and etc are studied, instruct and use in the horizontal well development of the same kinds of reservoirs.The main result of this paper:1. Determined the optimum length of lateral segment in horizontal well2. Derived the calculating formulas of inverted five-spots pattern, seven-spots pattern, inverted seven-spots pattern, nine-spots pattern and inverted nine-spots pattern and analyze influential factors.3. By studying G1 oilfield blocks, three-dimensional geological model by petrel software was set up.4. Using reservoir simulation, this paper proposed the well network, well array direction, vertical location of horizontal well and horizontal segment length for Daqing G1 oilfield blocks.