A METHOD FOR DETERMINING THE CURRENT LENGTH OF A HORIZONTAL SECTION OF AN OIL WELL UNDER CONDITIONS OF DEPLETION OF A DEPOSIT

When developing small oil fields with horizontal wells for depletion, i.e. without maintaining reservoir pressure, oil is extracted, since additional injection wells must be drilled to maintain pressure. In the range of reservoir pressure drop below the saturation pressure, the change in the above coefficients will be significant, and this will lead to a decrease in well flow. Therefore, to reach the initial level, it is necessary to increase the length of the horizontal part in order to maintain the flow rate and deepening of the layer. In most cases, horizontal wells are drilled without an appropriate justification for the length and diameter of the horizontal trunk and fountain pipes, their profile within the productive interval, the location of the trunk in thickness and relative to the contours of the drainage zone, taking into account the capacitive and filtration properties of the layers being opened, the degree of contamination of the bottomhole zone, the possibility of well flooding and the formation of deep depression funnels.

Therefore, when choosing the design of horizontal wells, it is necessary to take into account, in addition to the placement of trunks and the completeness of opening, the amount of depression on the formation, the anisotropy parameter, the profile of the trunk in the productive interval, the possibility of watering, etc.

The design features of horizontal wells exclude the possibility of direct use of methods and technologies developed for vertical wells to substantiate their design, opening the reservoir and placing such wells in thickness. This work is designed to solve this problem.