Method and device for treating bottom-hole zones of oil-and-gas-bearing formations

Abstract

The invention relates to the field of the oil producing industry and particularly to apparatus the cleaning of face zones and filters of gas-and-oil-producing and water-injection wells. Described is a method for processing bottom-hole zones of oil-and-gas-bearing formations, which method comprising steps of: pumping fluid into the wellbore, then, supplying instantly and unconstrainedly, via supplying lines using the pneumatic generator, a compressed gas agent onto the wellbore fluid mirror, which is accompanied with forming a gas cushion, thereby creating compression waves with sharp edges in said fluid, which waves carry energy with high fluid density along the wellbore with a slight attenuation and ensure a high disjoining pressure that ensures opening of filtration channels of the formation, then exhausting instantly the compressed gas agent, thereby creating dilatation wave with a sharp edge that forms a cavitation pocket in said fluid and ensures an ejection of bridging particles from the formation into the well. Described is an apparatus for processing bottom-hole zones of oil wellbores, which apparatus comprising a wellbore fluid supplying line provided with the valving, a pneumatic generator, compressed gas agent supplying lines provided with quick-operating valving, and a system for exhausting compressed gas agent having gating elements, wherein the pneumatic generator includes a hollow well head comprising an exhaust outlet and an end wall, with the generator open end mounted on the wellbore, into which the compressed gas flows via compressed gas agent supplying lines. On application of this invention, the technical result is in increasing the high-quality and reducing the period of cleanup of bottom-hole zones of producing wells of oil deposit, as well as in improving the apparatus properties concerned with ecology.

1 . A method for processing bottom-hole zones of oil-and-gas-bearing formations, which method comprising steps of: pumping fluid into the wellbore, then accomplishing an impact action onto the formation by supplying instantly and unconstrainedly, via supplying lines using the pneumatic generator, a compressed gas agent onto the wellbore fluid mirror, which is accompanied with forming a gas cushion, thereby creating compression waves with sharp edges in said fluid, which waves carry energy with high fluid density along the wellbore with a slight attenuation and ensure a high disjoining pressure that ensures opening of filtration channels of the formation, then exhausting instantly the compressed gas agent, thereby creating dilatation wave with a sharp edge that forms a cavitation pocket in said fluid and ensures an ejection of bridging particles from the formation into the well. 
   
   
       2 . The method according to  claim 1 , wherein compression-dilatation waves with sharp edges are created using gating elements made in the form of quick-operating valving. 
   
   
       3 - 6 . (canceled) 
   
   
       7 . The method according to  claim 1 , wherein condition of bottom-hole zone is determined using an instrument. 
   
   
       8 . (canceled) 
   
   
       9 . The method according to  claim 1 , wherein an acoustic impact onto the wellbore is carried out additionally. 
   
   
       10 - 11 . (canceled) 
   
   
       12 . An apparatus for processing bottom-hole zones of oil-and-gas-bearing formations, the apparatus comprising a wellbore fluid supplying line provided with the valving, a pneumatic generator of compression-dilatation waves, compressed gas agent supplying lines, and a system for exhausting compressed gas agent having gating elements, wherein the pneumatic generator includes a well head having full-opening cross-section, an exhaust outlet and an end wall, with the generator open end mounted on the wellbore, into which the compressed gas flows via compressed gas agent supplying lines, and the valving of the compressed gas agent supplying line being made in the form of quick-operating valving. 
   
   
       13 . The apparatus according to  claim 12 , characterizing in that the apparatus includes an expansion drum which has a flow area exceeding a flow area of the exhaust outlet and is provided with at least one deferent pipe that forms, together with the exhaust outlet, a system for exhausting compressed gas agent from the well head space. 
   
   
       14 - 17 . (canceled) 
   
   
       18 . The apparatus according to  claim 13 , wherein the quick-operating valving of the exhausting system is built into a pipe branch between the well head end wall and expansion drum. 
   
   
       19 . (canceled) 
   
   
       20 . The apparatus according to  claim 12 , wherein the exhaust outlet is adequate to the flow area of the well head end wall. 
   
   
       21 - 24 . (canceled) 
   
   
       25 . The apparatus according to  claim 13 , wherein at least one of the deferent pipes is provided with a make-and-brake joint and high-pressure hydraulic aggregate mounted with a possibility to be connected to said pipe into the location of the make-and-brake joint. 
   
   
       26 . An apparatus for processing bottom-hole zones of oil-and-gas-bearing formations, which apparatus comprising a wellbore fluid supplying line provided with the valving, a pneumatic generator, compressed gas agent supplying lines, and a system for exhausting compressed gas agent having gating elements, wherein the pneumatic generator includes a well head having full-opening cross-section and comprising an exhaust outlet and an end wall, with the generator open end mounted on the wellbore, into which the compressed gas flows via compressed gas agent supplying lines, wherein the hollow well head having at least one acceleration nozzle for the compressed gas agent built in the exhaust outlet, and the valving of the compressed gas agent supplying line being made in the form of quick-operating valving. 
   
   
       27 . The apparatus according to  claim 26 , wherein at least one acceleration nozzle is built into the exhaust outlet coaxial with this outlet. 
   
   
       28 - 29 . (canceled) 
   
   
       30 . The apparatus according to  claim 26 , wherein at least one acceleration nozzle is mounted above the exhaust outlet coaxial and with a gap along the outlet axis. 
   
   
       31 . The apparatus according to  claim 26 , wherein the acceleration nozzles are mounted in the exhaust outlet and above this outlet. 
   
   
       32 . (canceled) 
   
   
       33 . The apparatus according to  claim 26 , wherein at least one acceleration nozzle is made with perforated walls. 
   
   
       34 - 35 . (canceled) 
   
   
       36 . The apparatus according to  claim 26 , wherein at least one acceleration nozzle is made in the form of Laval nozzle. 
   
   
       37 . The apparatus according to  claim 26 , wherein the apparatus includes an expansion drum that has a flow area exceeding a flow area of the exhaust outlet and is provided with at least one deferent pipe that forms, together with the exhaust outlet, a system for exhausting compressed gas agent from the well head space. 
   
   
       38 . (canceled) 
   
   
       39 . The apparatus according to  claim 26 , wherein the gating elements of the exhausting system are made in the form of quick-operating valving. 
   
   
       40 - 46 . (canceled) 
   
   
       47 . The apparatus according to  claim 26 , wherein the exhaust outlet is adequate to the flow area of the well head end wall. 
   
   
       48 - 50 . (canceled) 
   
   
       51 . The apparatus according to  claim 37 , wherein at least one of deferent pipes is provided with a make-and-brake joint and high-pressure hydraulic aggregate mounted with a possibility to be connected to said pipe into the location of the make-and-brake joint.