SU1657610A1 - Method of insulation of absorbing or water-bearing stratum - Google Patents

Abstract

The invention relates to the oil and gas industry. The goal is to improve the quality of the insulation process. For this, the stem is treated in the range of absorption or water supply by jetting jets of the first component of the plugging mixture. The components are mixed by pumping the first component through the turbulent flow of the jetting jet of the second component at the static position of the filling pipe string. The resulting plugging mixture is injected into the channels of the formation rocks with a flow rate that creates a pressure drop across the top of the formation equal to or greater than 3.0 MPa. At the same time, the fluid flow rate is maintained within the limits sufficient to create a pressure drop over the roof of the insulated object equal to or greater than 30 MPa. This intensifies the process of separation from the mixture of mixing water and irreversible growth of its rheological properties. 1 il. yo

Description

The invention relates to the oil and gas industry, in particular to methods for isolating absorbing or water-producing formations in wells for various purposes.

The aim of the invention is to improve the quality of the insulation process.

The drawing shows the scheme of the proposed insulation method.

In the borehole 1, the filling pipes 2, the flow liquid in the filling pipes 2, the washing liquid filling the well 1, the first component 5 placed in the filling pipes 2 and the well 1 are placed. The second component 6 mixes about the column of the filling pipes 2, the monitor head 3, absorbing layer 4. zones 7 of clogging with jetting jets, zones 8 of isolation by injection of a mixture into them.

The method is carried out as follows.

In the well 1, a column of filling pipes 2 with hydraulic monitor 3 is lowered and installed at the bottom of the absorbing reservoir 4. The components of the cement mixtures — clay 5 and cement 6 — are pumped into the filling pipes successively and pushed until the first component emerges from the pipes 2. At this time 3 is raised 12–15 m above the absorption base (for the length of the working tube) and from the top downwards with simultaneous rotation of the tool, the walls of the well are processed by means of a jetting slurry, forming in the stalk zone, the colmatage layer 7 in areas where the filtration properties of the rocks are amenable to

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waterproofing in this way. At the end of the processing of the first interval, the tool is raised above its roof by 13-15 m and the operation is repeated.

In this way, the entire absorbed interval from the sole to the roof is processed, but in such a way that by the end of the first isolation phase the second component (cement mortar) approaches the lower end of the filling pipes 2. The honor of the first component 5 absorbed by the formation is located in the annulus above hydro monitor 3.

The tubular space is sealed with a preventer. Simultaneously feeding the cement mortar and the annular space of the slurry through the casting pipes at the static position of the tool, pumping the first component through the turbulent streams of the cement slurry mixes the latter and injects into the absorption channels 8. At the same time, the flow rate is maintained to the extent sufficient to create a pressure differential the roof of the insulated object is equal to or greater than-. j 3.0 MPa. This intensifies the process of separation from the mixture of mixing water and irreversible growth of its rheological properties. Upon completion of the operation, the preventer is opened, the tool is lifted from the well.

FORUMAWLAH AND ISLANDS

A method of isolating an absorbing or water-bearing formation by pumping a first component of a plugging mixture with clogging properties through a column of injection pipes, introducing a second component into the spacing of the first jetting jets, mixing both components and injecting the resulting plugging mixture into the rock channels of the formation, that, in order to improve the quality of the insulation process, the stem is treated in the interval of absorption or water supply by jetting jets of the first component that plugging mixture, mixing the components is produced t pumping the first through the turbulent flow of jetting streams of the second component in the static state column casting pipes, pumping the resulting plugging mixture into the channels of the reservoir rock is carried out at a flow rate that creates a pressure drop in the reservoir roof, equal to or greater than 3.0 MPa.

Claims (1)

Claim A method of isolating an absorbing or water-developing formation by pumping through the column of filling pipes the first component of the plugging mixture with clogging properties, introducing the second component into the interval of placement of the first hydraulic jets, mixing both components and injecting the resulting plugging mixture into the rock channels of the formation, characterized in that, in order to improve the quality of the isolation process, the barrel is processed in the interval of absorption or water development by the jet jets of the first component of the plugging mixture, the components are mixed by pumping the first through a turbulent stream of jet jets of the second component with a static position of the casting pipe string, and the resulting plugging mixture is injected into the rock channels the formation is carried out at a rate that creates a pressure drop across the roof of the formation equal to or greater than 3.0 MPa.