SU1446271A1 - Method of starting a well - Google Patents

Abstract

The invention relates to a gas and oil industry. The goal is to increase the efficiency of well development by preventing the reservoir from becoming contaminated with particles of clay mud (GR). A special solution is pumped into the well, which is lined with an explosive column, into the perforation interval and 150–200 m above it through the pump-compressor pipes, preventing contamination of the reservoir beds. Perforate the well. Then GH is replaced by light water by circulating, involving the mixing zone of GH and a special solution. The mixing zone is determined by calculation. In the contact zone of GH and a special solution, their mixture is formed. Circulation is performed involving the mixing zone completely. This prevents the deposition of clay particles on the face. Using this method improves the productivity of the well. with b cl

Description

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The invention relates to the oil and gas industry, in particular to methods for developing wells.

The purpose of the invention is to increase the efficiency of well development by preventing the reservoir formations from becoming contaminated with mud particles.

The method is carried out as follows.

A special solution is injected into the well cased with the production string into the perforation interval and for 150–200 m through the tubing to prevent contamination of the reservoir beds. Perforate the well. Then, the replacement of the clay solution with a light or water is carried out by circulation with the treatment of the mixing zone of the clay solution and the special solution. The mixing zone is determined by calculation, In the contact zone of the clay and special solution, their mixture is formed. This phenomenon is associated with the presence of convective motions due to the difference in density across horizontal sections. Circulating with the involvement of a mixing zone that completely prevents sedimentation of the downhole of clay particles.

Example, well data: 426 mm jig 22J m; 299 mm technical column 1500 m; 219 mm production column 3500 mj productive formations lie in the range of 3250-3450 m.

Descend into the well to a depth of 3450 m HscocHO-KOMnpeqcopHbie pipe. Diesel fuel is pumped through tubing in the interval 3450-3100 m. By calculation, the mixing zone of clay solution and diesel fuel is determined at the time of well completion with a circulation of 50 m.

Perforate the well, then descend under the level of the mixing zone of the drilling and special solutions to a depth of 3150 m tubing and call the inflow of formation fluid by creating a circulation of a solution of lower density or water, followed by aeration.

The implementation of the method increases the productivity of the well.

Claims (1)

Invention Formula The method of development of wells, including the injection of working fluid in the perforation interval and above it, the subsequent perforation and the replacement of the mud with a light circulation path, characterized in that, in order to increase the efficiency of well completion by preventing the reservoir particles from contaminating the wells, the circulation of the lightened solution or water is carried out with the involvement of the mixing zone of the mud solution and the working fluid.