SU1691513A1 - Method for tapping producing formation - Google Patents

Abstract

This invention relates to mining promet. The goal is to improve the quality of opening the reservoir due to uniform destruction of the cement ring (CK) by pulsating pressure drop in the interval of opening the reservoir while reducing material costs by combining the operations of the secondary open and well completion. The invention relates to the mining industry and is intended for the secondary dissection of productive formations in oil and gas wells. The aim of the invention is to improve the quality of opening the reservoir due to uniform destruction of the cement ring by pulsating pressure drop in the interval of opening the reservoir while reducing material costs due to After the housing is drilled into the well with holes blocked by acid-destructive material and the housing is the reservoir cements the well. Descend into & well column tubing with a generator of hydraulic pressure pulses (GGID). After washing, the well is pumped acid into it and held until the plugs are destroyed. The acid is removed and the CK is destroyed in the interval of the productive formation by pulsating pressure drop. At the same time, GGID is moved along the body. After the destruction of the CK in the entire interval of the reservoir, GGID is placed in the middle of this interval and water is pumped through it with the surfactant. Upon receipt of the influx of jammed well. Then GGID is removed, the pump is lowered into the well and put into operation. A pulsating dissection preserves the integrity of the CK outside the reservoir interval. combining the operations of the secondary opening and well completion. The method includes running casing in a column and placing it in a well opposite a producing formation with holes blocked by acid-ruptured material plugs, cementing the well, lowering the tubing string below the productive formation interval and flushing this interval with water, placing the acid in interval of the productive formation to the next with Och about 5 CJ

Description

the destruction of the plugs, the destruction of the cement ring opposite the open holes by creating a pressure differential. Before descending into the well, at the lower end of the tubing string, a hydraulic pressure pulse generator (GGID) is placed, after the plugs are destroyed, acid is removed from the well, and the pressure drop is created by pumping fluid through the GGID while simultaneously moving it upwards destruction of the cement ring in the entire interval of the reservoir is placed GGID in the middle part of the body and is injected into the bottomhole formation zone (PZP) of water with surfactant, after which give drawdown and washed repeatedly with an interval of productive layer.

The method is implemented as follows.

A casing with a casing having, for example, 50 holes with a diameter of 0.16 m, plugged with acid-breakable plugs, is lowered into the well. The holes are placed along the surface of the body in a spiral with a distance between them equal to 0.2. The body is placed in the well in front of the productive formation (PP). Cement the well to the mouth and after the cement hardens, the tubing with the GGID installed at its lower end is lowered into the well and is set below the SP interval. With the open annular valve flush the well to clean water. Hydrochloric acid is pumped into the PP interval. With the passage of fluid (water, acid) through HYGD, pressure pulsation is created. The well with the acid is maintained for 1-2 hours until the plugs are destroyed, after which the acid is removed from the well. Then, the cement ring is destroyed opposite the opened holes by creating a pressure drop of the pumping fluid through the GGID. At the same time, the GGID is moved upwards along the body. After destruction of the cement ring in the entire range of PP, GHD is placed in the middle part of the body and water with surfactant is pumped into the PPP. Then create a depression on the PP and re-washed interval PP.

The formation of channels in the cement stone is controlled by the pressure drop on the pressure gauge of the pump unit, which allows determining the moment of the need to move the zone of maximum pressure amplitude along the body.

The destruction of the cement ring in the pulsating mode makes it possible to improve the quality of the opening of the PP. The well is really always sloping and the thickness of the cement

rings are different in azimuth of the body. Opening with a pressure pulse allows the cement ring to be destroyed evenly and equally in azimuth. The creation of pressure in the pulsating mode reduces the likelihood of the cement ring breaking out of the PP interval as compared with the constantly increased pressure, which reduces the watering of the well and inter-layer flows. After receiving the inflow well

Claims (1)

suppress, raise GGID, lower the pump into the well and put it into operation. The invention method of opening the reservoir, including the descent of the column casing and placement in the well in front of the productive formation of the body with openings blocked by acid-ruptured material plugs, cementing the well, lowering the tubing string below the interval the reservoir and flushing this interval with water, placing the acid in the interval of the reservoir before breaking the plugs, destroying the cement ring opposite the openings by creating a pressure differential, characterized in that, in order to improve the quality of the reservoir due to the uniform destruction of the ring pulsating differential pressure in the interval of opening of the productive formation while reducing material costs by combining the operations of the secondary opening and development of the well, before descending into the well, the generator of hydraulic pressure pulses is placed at the lower end of the tubing string, and the difference pressures are created by pumping fluid through a hydraulic pulse generator with simultaneous movement from bottom to top along the body with openings, and after placing the cement ring throughout the entire reservoir interval, the hydraulic pressure pulse generator in the middle part of the body is destroyed and pumped into the bottom hole formation zone with a surface active substance, after which they create a depression in the formation and re-flush the interval of the productive formation.