Procedure for selective isolation and restraint of water production into horizontal wells

FIELD: oil and gas production.

SUBSTANCE: invention refers to oil producing industry, particularly, to procedures of isolation and restraint of water production in horizontal boreholes of producing wells. The procedure consists in polymer pumping, in driving polymer solution, and in well shut-down for the period of polymer structure formation. Prior to pumping polymer solution into each interval, blocking fluid with optimal period of "life" is pumped into the well; further, specified volume of polymer is pumped into an isolated interval during this period of "life"; after the expiration of the period blocking fluid self-decomposes in volume required for filling the horizontal borehole from the bottomhole of the well to the nearest from the bottomhole boundary of interval of polymer solution treatment. Upon conditioning, decomposer of polymer is pumped into the well for the period of polymer structure formation in the latest treated interval; with water decomposer is further driven through into a reservoir to the nearest near-well zone and is conditioned there for the period of polymer decomposition.

EFFECT: increased efficiency of isolating water production in horizontal wells.

5 dwg, 1 ex

 

The invention relates to the oil industry, in particular to methods of restriction and isolation of the water in a horizontal trunks of producing wells.

There is a method of isolation of the water in a horizontal wellbore producing wells using a collar without coupling long tubes, which consists in filling the horizontal section of the wellbore blocking fluid and the subsequent injection of water composition in water producing interval of the formation (RF patent №2235873, CL 7 EV 43/32, 33/13, 2003).

The disadvantage of this method is the additional equipment, in particular collar without coupling long tubes, increasing the number of tripping operations and the time of implementation of activities, the complexity of the implementation of the forcing of water composition in the interval isolation method Dating back fill where fill rate isolated interval of the horizontal shaft must match the speed of the lifting collar without coupling long tubes. The disadvantage is that the method is applicable only in the case when precisely defined arrangement intervals of the water.

Know of any other way to isolate the produced water in open hole horizontal section of the production well, whereby after the descent of the casing to the bottom of horizontalvelocity wellbore annulus open hole horizontal section filled with cement mortar, modified polyvinyl acetate reagent, hold the shutter speed for 2-3 hours, followed by washing wells (RF patent No. 2273722, CL EV 33/13, 2004). According to the mode across intervals vodopodayuschih layers form a thin dense waterproof coat.

The disadvantage of this method is the ability to quickly break the insulated water in a horizontal wellbore along a thin impervious cover in the well. This contributes to the fact that, as a rule, horizontal trunks drilled along the strata of the rocks, and permeability along the strata are much higher than in the transverse direction. Therefore, the produced water can be easily filtered by the rocks unconformity along the thin impervious cover and to break into the cavity horizontal wellbore.

The closest technical solution chosen for the prototype is a way of isolating the water in a horizontal wellbore production wells (RF patent No. 2286447, CL EV 43/27, 2004).

The method comprises the injection into the bottom zone to create a preventive layer of a viscous oil, fillers, acid-soluble or light oil, the particle size which is bigger than the size of the pores and channels in oil-rich end of the horizontal shaft, but smaller than the channels in the area of water production, the subsequent injection of the polymer or composition on the basis of the angle of ogorodnoi liquid hydrophilic powder material or a mixture thereof, the displacement of the polymer or composition of hydrocarbon-based fluid with hydrophilic powder material or a mixture thereof, a stop well at the time of curing of the polymer or composition of hydrocarbon-based fluid with hydrophilic powder material or a mixture thereof, the drilling of the cured polymer or composition of hydrocarbon-based fluid with hydrophilic powder material or a mixture thereof, the injection of acid or a light oil or diesel fuel or distillate.

The disadvantage of this method is the difficulty of establishing a reliable preventive layer, which will depend on the choice of the optimal size of the fillers viscous oil, otherwise it may significantly decrease the permeability of the zone of water production and the decrease of the coefficient of the selectivity of the subsequent injection of the plugging composition. The disadvantage is the need for drilling cured plugging composition or mixture of plugging compositions.

The task of the invention is to increase the efficiency of isolation of water flow in horizontal wells, and also in long horizontal wells cased or open bottom, and is equipped with a shank filter at an elevated reservoir temperature when you do not know the location of the zone of water flow.

The technical result is to create an efficient method for the isolation of water flow in horizontal wells, providing selective penetration of water compositions mainly in the area of water production, and also in long horizontal wells cased or open bottom, and is equipped with a shank filter at an elevated reservoir temperature when you do not know the location of the water flow area

The invention consists in that in the method the interval isolation and limitation of the water in horizontal wells, including injection of the polymer in each interval, the displacement of the polymer solution with water, stopping well during the structure formation of polymer after processing each interval, before the injection of the polymer solution in each interval in the well is pumped blocking fluid with an optimal time of "life", within which is injected into the isolated interval specified volume of the polymer, after which the self-destruction blocking fluid volume required to fill the horizontal stem from the borehole bottom to the near side of the bottom limit of the interval of processing the polymer solution after exposure for a period of structure formation of polymer in the last processed interval in SC is the azhina download destructor polymer, which then pushes the water into the reservoir in the near well bore area and maintain for the period of the destruction of the polymer in this area.

What's new is that horizontal well treated pointervalue from a distant area from the well bottom, moving to the bottom, each time cutting off a region, uncultivated polymer, completing this part of the horizontal wellbore auto blocking fluid with a given ' lifetime', which allows for the processing of long boreholes in the conditions of high temperatures, when the solids are injected into the entire horizontal wellbore polymer composition is limited to a small gelation time and can be complicated by the premature formation of a gel structure in the wellbore, in addition, does not require subsequent drilling of the cured polymer.

As the blocking of auto fluids can be used, for example, an aqueous solution of the inverse emulsion type, containing, parts: diesel fuel 25-38, emulsifier Alan 9-1 0.5 to 5, the water of 62.5-70.

As the polymer composition can be used, for example, a composition containing, parts: polyacrylamide 1-2,5, water 97-98,8, a crosslinking agent, the chromium acetate 0.2 to 0.5.

As the destructor of the polymer may be used, for example, a composition containing, parts: monoperoxyphthalate urea 5-20, water 80-95.

Pre the submitted drawings explain the scheme of implementation of the method in the open horizontal shaft on the example techinterviews processing.

Figure 1 shows the open horizontal shaft 1, the location of the blocking liquid 2, water composition 3 when processing the first interval, podavlivaya fluid 4.

Figure 2 presents outdoor horizontal shaft 1, the location of the blocking liquid 2, the structured polymer layer 5, water composition 3 when processing the second interval, podavlivaya fluid 4.

Figure 3 presents outdoor horizontal shaft 1, the location of the structured polymer layer 5, water composition 3 when processing the third interval, podavlivaya fluid 4.

Figure 4 presents outdoor horizontal shaft 1, the location of the structured polymer layer 5, destructor polymer 6 when processing the entire horizontal wellbore, podavlivaya fluid 4.

Figure 5 presents outdoor horizontal shaft 1, the location podavlivaya liquid 4 and the structured polymer layer 5 after the destruction of the polymer in the stalk zone.

An example implementation of the method.

Horizontal well has an open barrel with a length of 900 m and a diameter of 152 mm, the Interval of the well water inflow is unknown. The decision on carrying out waterproofing works with phased techinterviews processing is th length of the horizontal well.

Waterproofing work is carried out in the following sequence.

Into the well through the tubing pump 9,2 m3the blocking fluid, after which inject the polymer solution in a volume of 45 m3. Download initially carried out at the open annulus of the valve, when reaching the blocking fluid tubing valve closed. Since the blocking fluid is not filtered into the reservoir, it is one's pressing away the polymer to the borehole bottom, blocking the far part of the trunk from the penetration of the polymer. The polymer is filtered into the reservoir in the first interval, i.e. in the area of the hole that is not filled with the blocking fluid, and in a greater degree in the area of water production, which is achieved by selective filtering of the polymer. The displacement of the polymer carry water. Followed by a technological restraint during gelation and the self-destruction blocking fluid with a duration of 12-24 hours.

Then, when the open annulus valve in the well pumped 4.6 m3the blocking fluid, after which inject the polymer solution in a volume of 45 m3when reaching the blocking fluid tubing valve closed. The displacement of the polymer carry water. In this case, blocking fluid also one's pressing away on the bottom hole, and a polymer mainly filtered into the reservoir, the second is nterval, i.e. in the area of the well, which is not occupied by the blocking fluid and structured gel, and in a greater degree in the area of water production, which is achieved by selective filtering of the polymer. Then spend the next technological exposure during gelation and the self-destruction blocking fluid with a duration of 12-24 hours.

The next step in the well at the open annular valve pump 45 m3polymer, while achieving the polymer tubing valve is closed, the pushing of the polymer is carried out with water, and the polymer is filtered primarily in the third interval, to a greater extent in the area of water production, which is achieved by selective filtering of the polymer. Spend the next technological exposure during gelation duration of 12-24 hours.

The next step in the well at the open annular valve pump 14 m3destructor polymer, when reaching the destructor tubing valve cover, replacing the destructor from the well near the stalk region. Punching destructor hold water, while the destructor penetrates into the reservoir rather evenly along the entire length of the horizontal wellbore in accordance with the kinetics of chemical interaction. Spend the next technological exposure for the period of the development of the texts of the gel in the stalk region within 6 hours.

Method interval isolation and limitation of the water in horizontal wells, including injection of the polymer, the displacement of the polymer solution, stop wells for the period of structure formation of polymer, characterized in that before the injection of the polymer solution in each interval in the well is pumped blocking fluid with an optimal time of "life", within which is injected into the isolated interval specified volume of the polymer, after which the self-destruction blocking fluid volume required to fill the horizontal stem from the borehole bottom to the near side of the bottom limit of the interval of processing the polymer solution, after exposure for a period of structure formation of polymer in the last processed time interval in the well pumped destructor polymer, which is then forced into the formation in the near-well bore area and maintain for the period of the destruction of the polymer in this area.



 

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.2
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8 ex, 2 tbl

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2 cl, 2 dwg, 1 ex, 1 tbl

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