Method of well completion

 

The invention relates to the oil and gas industry, namely, development of gas wells, especially at low reservoir pressure (anpd). Provides a smooth call flow from the reservoir through the gradual reduction of back pressure on the reservoir by reducing the light level of the liquid in the barrel developed wells, gas, and reduce the pollution of bottom-hole formation zone by eliminating zadavki mud into the formation with minimal capital and operating costs. The inventive method includes the descent of the lift pipes, replacing the mud on the lighter fluid, stimulation, development and testing of the well to the torch. In this call flow produced by the flow of natural gas from nearby wells and fluid from the pump unit booster installation, compressing it gas-liquid mixture to a pressure greater than the current reservoir pressure. Then the gas-liquid mixture is fed into the separator where it is separated into liquid and gaseous media. The liquid phase is directed back to the pump unit. The high-pressure gas is directed first into the tube space assimilate well with the displacement of the light liquid in the same Shoe tubing string. Next make the connection pipe space well with a flare line without interrupting the gas flow in the annulus before the beginning of the call flow. 1 C.p. f-crystals, 2 Il.

The invention relates to the oil and gas industry, namely, development of gas wells, especially at low reservoir pressure (anpd).

There is a method of well development, including the descent of the lift pipes, replacing the mud on the lighter fluid, stimulation, development and testing of the well on the torch [Equipment for operation of gas wells. The catalogue. - M.: CITIHOMES, 1982, S. 4].

The disadvantage of this method is the lack of smoothness of running well in operation at abnormally low and the inevitable pollution of bottom-hole formation zone filtrates mud, and quite a significant duration of stimulation and testing of wells on the torch.

There is a method of well development, including the descent of the lift pipes, replacing the mud on the lighter fluid, stimulation, development and testing of the well on the torch [RF Patent №2109934].

The disadvantage of this method is the lack of smoothness of running well in operation at abnormally low and the inevitable pollution brisabois the and and development wells on the torch.

The challenge when creating the invention is to improve the reliability and effectiveness of well development.

Achievable technical result, which is obtained by the invention, is to provide a smooth call flow from the reservoir through the gradual reduction of back pressure on the reservoir by reducing the light level of the liquid in the barrel developed wells, gas and reduce pollution of bottom-hole formation zone by eliminating zadavki mud into the formation with minimal capital and operating costs.

The task and the technical result is achieved by the fact that in the known method of development wells, including the descent of the lift pipes, replacing the mud on the lighter fluid, stimulation, development and testing of the well on the torch unlike the prototype call flow produced by the flow of natural gas from nearby wells and fluid from the pump unit booster installation, compressing it gas-liquid mixture to a pressure greater than formation pressure, current, flow, gas-liquid mixture in the separator, the gas-liquid separation of the mixture of liquid and gaseous phase, directions of the liquid phase back is of a lightweight liquid on the surface or by pushing her into the formation, then in the annulus before reaching the supplied gas Shoe tubing string, the subsequent connection to the tube space well with a flare line without interrupting the gas flow in the annulus before the beginning of the call flow. In addition, the stimulation produced by feeding high pressure gas into the internal cavity of the flexible tube coiled tubing installation, deployed gradually in the tube space developed well before slaughter, and the displacement of the light fluid at the beginning of the pipe, and then from the annular spaces assimilate well with providing stimulation.

In Fig.1 shows a scheme for the implementation of this method, Fig.2 - scheme for the implementation of this method with the use of coiled tubing equipment.

The method is implemented as follows.

Low-pressure gas (20 kgf/cm2from neighboring wells 1 via line 2 at an open gate valve 3 serves in booster installation 4, simultaneously it from the pump unit 5 through the pipe 6 serves technical water (in winter - methanol-water). In booster installation 4 gas and water are mixed, forming a gas-liquid mixture, the mixture is pressurized up to, is greater than the current reservoir pressure (70 to 90 kgf/sdelanie gas-liquid mixture of liquid and gas media. The liquid from separator 8 through the pipe 9 is again sent to the pump unit 5, and the high-pressure gas (70-90 kg/cm2) served by pipeline 10 and advocay line 11 at the open gate valves 12, 13, 14 in the tubular space 15 assimilate the wells 16. The gas pushes the technological solution, which is in the trunk master bore 16, through annular space 17 to the surface where it is collected through discharge line 18 and line 19 at open gate valves 20, 21 and closed valve 22 into the container 23 for collecting technological solutions. In the case of good injectivity of the reservoir technological solution is forced into the reservoir 24. Then close the valve 13 on the tubular space 15 and serves the gas in the annular space 17 through pipelines 10, 25 and flow line 18 when open 12, 22, 20, and closed 13, 21 valves. When the gas Shoe tubing string 26 to open the valve 27, which connects the tubular space 15 master bore 16 with the flare line 28, and continue to supply gas into the annulus 17 before symptoms developed wells 16. Then close the valve 20 into the annular space 17 and work well 16 on the torch around the pipe space 15 and flare line 28.

The tolerance of the unit 31 at 32 open and closed 12 valves. Flexible pipe 30 through the guide groove 33, the injector 34, and flow preventers 35 is gradually lowered into the tubular space 15 assimilate the borehole 16, the valve 20 when it is closed. Technological solution, which is in the trunk master bore 16, is extruded through the annular space between the flexible tube 30 and the inner wall of the lift pipe 26 and the pipe 34 to the surface when open 27, 35 and closed 13, 36 valves into the tank 37 for collecting technological solutions. The descent of the flexible tube 30 is carried out until slaughter 38 master of the well 16. This ensures complete cleaning of the barrel assimilate the wells 16 of the technological solution and replacing it with natural gas. The valve 35 is closed, open valve 36 on the flare line 28, while continuing to supply gas into the internal cavity of the flexible tube 30. In order to fully clean the annulus 17 from the technological solution serves gas from the booster installation 4 and separator 8 through pipelines 10, 25 and flow line 18 when open 12, 22, 20 and 32 closed, 21, 13 the valve into the annulus 17. After obtaining a steady inflow valves 13, 20 pipe 15 and the annulus 17 spaces wells 16 close and work well 16 on the torch. After testing Scotia wells provides fire and gusher security, reliability and trouble-free process, reduces pollution of bottom-hole formation zone, provides a smoother running well in the work, reduces the duration and cost of development wells.

Claims

1. The way of development wells, including the descent of the lift pipes, replacing the mud on the lighter fluid, stimulation, development and testing of the well on the torch, characterized in that the stimulation produced by the flow of natural gas from nearby wells and fluid from the pump unit booster installation, compressing it gas-liquid mixture to a pressure greater than formation pressure, current, flow, gas-liquid mixture in the separator, the gas-liquid separation of the mixture of liquid and gaseous phase, the direction of the liquid phase back to the pump unit, and high-pressure gas initially - in tube space assimilate well with the displacement of the light liquid on the surface or by pushing it into the reservoir, then into the annulus to achieve the supplied gas Shoe tubing string, the subsequent connection to the tube space well with a flare line without cessation raissadat by feeding high pressure gas into the internal cavity of the flexible tube coiled tubing installation the lander slowly into the tube space developed well before slaughter, and the displacement of the light fluid at the beginning of the pipe, and then from the annular spaces assimilate well with providing stimulation.

 

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