Method for producing crude oil

Abstract

The invention describes a method for injecting a fluid into a crude oil-containing layer of rock or earth by means of a suitable line, wherein the line is introduced into the layer of rock or earth and the fluid is injected for the purpose of an enhanced crude oil production from the crude oil-containing layer of rock or earth.

1 . A method for injecting a fluid into a crude oil-containing layer of rock or earth by means of a suitable line, wherein the line is introduced into the layer of rock or earth and the fluid is injected for the purpose of an enhanced crude oil production from the crude oil-containing layer of rock or earth,
 characterized in that the fluid is discontinuously injected into the crude oil-containing layer of rock or earth.   
   
   
       2 . The method according to  claim 1 , characterized in that the fluid is injected into the crude oil-containing layer of rock or earth in a positioned manner. 
   
   
       3 . The method according to  claim 1 , characterized in that the fluid is injected in the gaseous state. 
   
   
       4 . The method according to  claim 3 , characterized in that the fluid is selected from the group consisting of nitrogen, carbon dioxide and gaseous hydrocarbons. 
   
   
       5 . The method according to  claim 4  wherein said gaseous hydrocarbon is methane. 
   
   
       6 . The method according to  claim 1 , characterized in that the fluid is injected in pulses. 
   
   
       7 . The method according to  claim 6 , characterized in that different fluids are injected in succeeding pulses. 
   
   
       8 . The method according to  claim 6 , characterized in that the time lag between two injection pulses is not shorter than pulse length, 
   
   
       9 . The method according to  claim 8 , characterized in that the time lag between two injection pulses is one to ten times the pulse length. 
   
   
       10 . The method according to  claim 6 , characterized in that the period required by the gas to cover half the distance between the line, through which the fluid is injected, and the conveyor line, is chosen as minimal pulse length. 
   
   
       11 . The method according to  claim 6 , characterized in that the fluid is injected from more than one line in a positioned manner, wherein pulse length, pulse distance and/or start of the injection in the case of at least one line is/are different from pulse length, pulse distance and/or start of the injection in the case of at least one other line. 
   
   
       12 . The method according to  claim 9 , characterized in that the quantities of induced fluids from at least two lines are adjusted in such a manner that the induced fluid from a first line is diverted in the direction of the conveyor line by means of the quantity of the injected fluid from at least a second line. 
   
   
       13 . The method according to  claim 10 , characterized in that the direction of the induced fluids from at least two lines is adjusted in such a manner that the combined fluid flow from the lines is oriented in the direction of the conveyor line. 
   
   
       14 . The method according to  claim 2 , characterized in that the fluid is injected as directed shock wave.