Method for isolating influx of foot water and fixing of well-adjacent gas wells bed zone of deposits with abnormally low bed pressure

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes feeding water-isolating compound along tubing pipes, containing polyvinyl spirits and consisting of components forming an impenetrable zone in case of mixing in the bed, pressing it into bed, washing and exposure of well for forming of impenetrable zone, tubing column is lowered for 2-3 meters below perforation range, and into isolation range along tubing pipes hydro-repelling liquid is first pumped, in volume, exceeding volume of water-isolating composition in at least two times, water-isolating composition includes special liquid except from polyvinyl spirits, its pumping is performed in sequence - first goes polyvinyl spirits, then buffer liquid, special liquid, buffer liquid, repeating these operations until reaching required height of isolation interval and fixing of well-adjacent area, after that said pressing, washing of well and said polymerization exposure are performed.

EFFECT: higher efficiency.

1 dwg, 1 ex

 

The invention relates to the oil and gas industry, in particular to the field of operation and maintenance of wells and isolate the flow of formation waters in gas wells, which are characterized by significant fluid absorption damping due to low reservoir pressure availability of washed out areas and cavities in the near-wellbore area of the formation (PPP).

A known method of injection two-component compositions after mixing of the components [Lee, A.V. Grigoriev Apelco. Insulation works the completion and operation of oil wells. M., Nedra, 1998, str].

The disadvantage of this method is the complexity of its use for the isolation of an extended absorbing gas recovery intervals.

The closest technical solution chosen for the prototype is isolation technology inflow of formation water in the well using a composition consisting of two components [Euiro, Sgiliau, Moskalyov, URALSIB. The way to isolate the flow of formation waters in the borehole, AC SU # 1328488, publ. 07.08.87, bull. No. 29].

The disadvantage of this method is its unsuitability for isolation of highly absorbing gas recovery and long perforated intervals.

The task of the invention is to develop an efficient method for the isolation of the inflow of formation water in gas wells, characterized is relating to significant absorption of fluid damping due to low reservoir pressure, the availability of washed out areas and cavities in the PPP.

The technical result of the invention is to improve the efficiency of isolation of bottom water, as well as fixing the PPP gas wells.

The task and the technical result is achieved by the fact that in the method of isolation of the inflow of bottom water and fastening the PPP gas of wells with abnormally low formation pressure, including injection water composition consisting of two components that form when mixed in the layer of impervious area, in contrast to the known, tubing down 2-3 meters below the perforated interval in the interval isolation pumped through the tubing gidrofobiziruyuschey fluid in the volume in two or more times the volume of water composition, the tubing sequentially fetch the first component of water composition, the buffer fluid the second component of water composition, the buffer fluid, and repeating these operations until reaching the desired height interval isolation and fixing the walls of the well, after which push water composition in the reservoir, the wells are washed and left for the polymerization of water composition.

Alternating injection components water composition, e.g. the measures on the basis of polyvinyl alcohol (PVA) and hydrophobic organosilicon liquid (NGL) leads to the formation of considerable height fixed area in the perforated interval due to the fact that by mixing PVA and NGL almost instantly formed a gel-like mass, further displacement in the reservoir requires increased repression. The liquid level in the turns, rises and the remaining volume of NGL and PVA go into the reservoir above the already established areas. Alternating several times, thus, the injection of PVA and NGL, can be consolidated and extended in the height interval of wellbore zone, characterized by significant acquisitions. The height interval isolation can be defined by the rise of liquid level killing in the turns.

An example implementation of the method

The drawing shows a diagram of the pumping and placement of the components of water composition in the PPP gas wells.

Flooded gas well at a depth of 1100 m and perforation interval of 40 m, with significant fluid absorption killing, muffled by secretorum. Circulation is not due to absorption. In the lower part of the PPP is washed area with a cavity 1. The fluid level in the well is 400 meters

In the well was lowered through the tubing 2 to two meters below the perforated interval. When the open annulus valve in the hole in NC is pumped 20 m 3condensate 3. When the condensate tubing closed annular valve. In the well consistently on the first speed of the machine has pumped: a ten percent aqueous solution of PVA 4 in volume 4 m3, 0.2 m3condensate, 6 m3NGL 5, 0.2 m3condensate, 3 m3PVA 6, 0.2 m3condensate, and squeezing the liquid 7. Washed well in polutorakratnomu volume (appeared circulation) and the well was left for 24 hours for polymerization of water composition.

The way to isolate the flow of bottom water and fastening borehole zone gas wells oil fields with abnormally low formation pressure, including injection in the tubing - tubing water isolating a composition containing polyvinyl alcohol and consisting of the components that form when mixed in the layer of impervious area, its displacement in the reservoir, flushing and abandonment of wells for the formation of an impermeable zone, characterized in that the tubing is lowered to 2-3 m below the perforated interval, the interval of the insulation tubing pre-fetch gidrofobiziruyuschey fluid volume at least twice the volume of water composition water composition addition of polyvinyl alcohol contains NGL, the injection is carried out in sequence - first polyvinyl who Peart, then the buffer liquid, NGL, the buffer liquid, and repeating these operations until reaching the desired height interval isolation and fastening borehole zone, followed by the specified displacement, rinse well and indicated the abandonment of the polymerization of the above-mentioned insulating composition.



 

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