Procedure for development of multi-pay oil deposit

FIELD: oil and gas production.

SUBSTANCE: procedure for development of multi-pay oil deposit consists in casing string opening, in lowering packer on oil-well tubing (OWT), in positioning packer between reservoirs, in pumping hardening back-filling solution and in its conditioning. Back-filling solution is preliminary pumped and pressurised into a lower watered reservoir. Upon back-filling solution hardening in the reservoir the casing string is opened above the lower reservoir. Packer is set above interval of casing string perforation. A connecting rod receiving fluid from the watered reservoir by means of the pump is arranged at a lower end of the OWT string.

EFFECT: raised efficiency of procedure for development of multi-pay oil deposit due to maintaining operational mode of producer and elimination of filtration of reservoir water through annular space to upper payout reservoir of well thus increasing well operation period; reduced well production watering and increased reservoir recovery.

1 dwg

 

The proposed method relates to the oil industry, in particular to methods for developing multilayer deposits of oil and limitations of water in producing wells, which revealed two or more of the productive formation.

There is a method of isolating interval of leakage in the casing in the borehole (patent RU №2254443, E21B 33/13, publ. Bull. No. 17 dated 20.06.2005), including the definition of a range of leakage in the casing, the education of the screen from the plastic mass in the annular space through the injection well and produce in its annulus under pressure working fluid to its interaction with developing fluid. The well is maintained at a pressure of up to set formed of plastic by weight not less than 30% of the final planned structural strength. Then remove the remnants of the plastic mass from the casing at a pressure precluding reverse flow of the main volume of the visco-plastic mass of the annular space in the casing, after which the well can withstand up to a set of viscoplastic weight of the final structural strength.

The disadvantage of this method is low efficiency, due to the fact that the insulating material penetrates, primarily in high-permeability channels of the reservoir and at a relatively small depth, the OS is avlee small pores and cracks with higher filtration resistance uninsulated, that reduces the tightness of the casing in the well and, as a consequence, leads to a rapid restoration of cross-flows.

The closest in technical essence to the present invention is a method of repair of wells, including the opening of the casing, the descent to Nocona-compressor pipes (tubing) packer, the setting of the packer between the layers, the injection of cement slurry in the annulus, waiting for it to cure and removing the packer (patent RU №2354802, E21B 29/10, 33/13, publ. Bull. No. 13 from 10.05.2009). Before injection of the insulating material spend filling pedacinho space insulating material and setting of the packer. The installation of the packer perform between the lower and upper productive formation. For injection of the insulating material in the annulus increases the pressure in padmakara space, reduce the pressure in the borehole in nadakarni space without reducing the pressure in padmakara space. Before removing the packer equalize pressure in nadakarni and padmakara space, after removal of the packer washed hole from the remnants of an insulating material and conduct technology shutter speed for setting and curing of the insulating material.

The disadvantage of this method is that the known method does not allow to exclude the filtration of produced water in annulus is the space to the upper productive formation wells which, in turn, prevents the flow of oil to the perforation intervals and increases water cut wells. In cases where the lower layer is vysokopiaristye, all of the injected solutions collateral him, not behind-the-casing flows.

The technical objective of the proposed method is to increase the efficiency of the method of developing multilayer deposits of oil by maintaining the operating mode of the production well and exceptions filter produced water in the annular space to the upper productive formation wells, reduction of water production wells and increase oil recovery.

This task is solved by a method of developing multilayer deposits of oil, including the opening of the casing, the descent to Nocona-compressor pipes (tubing) packer, the setting of the packer between the layers, the injection of the hardening cement slurry and waiting for it to cure.

What's new is that pre-fetch and push cement slurry at the bottom of obwodnica layer, after curing the layer of cement slurry to produce the opening of the casing above the lower layer, set the packer above the perforated interval of the casing, and the bottom end of the tubing string set the nozzle for receiving the fluid pump from obvo is newsthose layer.

The drawing shows a section of oil-saturated reservoir placed in the vertical bore of the proposed method.

The invention

Oil reservoir razvarivat wells 1 project on the net, carry out their arrangement, clarify the geological structure of the deposits, determine the capacitive layer permeability: upper 2 and lower 3, the thickness of the clay rocks 4 which separates the upper productive layer 2 of the bottom 3. At the production wells 1 produce the perforation 5 of the casing and the selection of well production from reservoirs 2 and 3. Make regular measurements of selected oil and water. Determine the water content of the layers 2 and 3 on their products in the borehole, identify the reasons for its growth. During operation, increasing the water content of the lower vysokobarievogo productive formation. In violation of the integrity of the annular space occur behind-the-casing flows and flooding of the upper productive formation. The oil production rate is reduced to uneconomic.

To maintain the operational mode of the production well and exceptions filter produced water in the annular space to the upper productive formation wells, reduction of water production wells and increase oil recovery, isolation, lower vysokobarievogo productively what about layer 3, it pumped cement slurry 6. As the cement slurry is used, for example, gel-forming composition, etc. the Amount of cement slurry required for killing of Obvodnogo layer depends on the thickness of the layer and its permeability.

After curing of the cement slurry 6 in the lower layer 3 above the lower layer in the interval of occurrence of weakly cemented shale produce the opening of the casing of the well 1 perforation 7. The perforation interval 7 is at a distance of one to two meters above the roof of the lower layer 3. Lower packer 8 Nocona-compressor pipes (tubing) 9 and set between the upper 2 and lower 3 layers above the perforated interval 7. In the annulus 10 is injected hardening cement slurry (for example, gel-forming formulations, and others). Well stop on technological shutter speed depending on the composition of the cement slurry. As the cement compositions used cement slurries, aqueous solutions of polymers, etc. After pumping the cement slurry push to fill Sokolenko space gelling composition.

In the lower part of the casing install the fitting 11. The lower part of the casing is placed above the roof of the lower layer 3 at a distance of 1.0 to 1.5 m When excess pressure in podvecerni the area above Yes the population in nadakarni the area there is a flow of formation fluid through the fitting from the bottom up in nadakarni zone, from which it is drawn deep well pumping equipment.

By creating a depression in the bottom hole zone of the proposed method ensures smooth establishing the desired operational mode works well and eliminates the filtration of produced water in the annular space to the upper productive formation wells, which, in turn, prevents the flow of oil to the perforation intervals and increases water cut wells.

The method provides for maintaining the permeability of the oil-saturated part of the reservoir, reduces water cut production by more than 15% due to the exclusion of permeability between productive layers in the annular space of the well, prevents the ingress of water from the bottom of Obvodnogo reservoir into the upper reservoir, which increases oil production rate and consequently oil recovery.

Specific example

Oil reservoir razvarivat wells project on the net, carry out their arrangement. Production well 1 revealed two productive stratum 2 and 3. The thickness of the weakly cemented shale 4, separating the layers, is eight meters.

At the production wells open perforation 5 reservoirs 2 and 3. During operation make regular measurements of selected oil and water. About Radelet watering layers 2 and 3 on their products in the borehole 1, reveal the reasons for its growth. After a year of well operation the lower reservoir 3 obwodnica. As a result, the water content in crude production rose to 92%. Oil production from the upper reservoir 2 decreased from 9.2 tons/day to 0.8 tonnes/day. Based on our data establish the presence of cross-flows of produced water between reservoirs 2 and 3. Produced water from the lower reservoir 3, rising up to the annulus, to prevent the flow of oil from the reservoir 2 to the perforation interval.

To isolate the bottom of the reservoir 3 into it pumped aqueous solution of polymers 6 in the quantity necessary for plugging of the formation.

After curing of the cement slurry 6 in the bottom layer of the 3 above him in the interval of occurrence of weakly cemented shale produce the opening of the casing of the well 1 perforation 7. The perforation interval 7 is located at a distance of two meters above the roof of the lower layer 3. After the descent of the tubing packer 8 installed between the top layer 2 and the perforated interval 7 at a distance of 1.5 m above the perforated interval. In the annulus 10 is injected hardening cement slurry is an aqueous solution of polymers. Well stop on technological shutter speed depending on the composition of the cement slurry.

In the lower part of the casing install the fitting 11. The lower part of the tubing string post vysetrovani lower reservoir 3 at a distance of 1.5 m

The proposed method can improve the efficiency of the method of developing multilayer deposits of oil by maintaining the operating mode of the production well and exceptions filter produced water in the annular space to the upper productive layer of the well, thereby prolonging the period of operation of the well, reducing the water production wells and increase oil recovery.

The method of developing multilayer deposits of oil, including the opening of the casing, the descent to Nocona-compressor pipes (tubing) packer, the setting of the packer between the layers, the injection of the hardening cement slurry and waiting for it to cure, wherein the pre-fetch and push cement slurry at the bottom of obwodnica layer, after curing the layer of cement slurry to produce the opening of the casing above the lower layer, set the packer above the perforated interval of the casing, and the bottom end of the tubing string set the nozzle for receiving the fluid pump of Obvodnogo layer.



 

Same patents:

FIELD: oil and gas production.

SUBSTANCE: procedure consists in drilling-out with producers crossing impermeable natural inter-layers in pay-out bed, in lowering casing string with successive perforation of pay-out bed, in analysis of oil-and-water saturation and intervals of their bedding, in analysis of dimension of impermeable natural interlayer and in making barriers out of insulating composition separating water-saturated zones of bed from oil-saturated zones. By results of analysis there is determined thickness of the oil-saturated zone of the bed. If thickness of oil-saturated zone of the bed exceeds 4 metres, part of the casing string is cut out in the interval above lower perforation orifices of the oil-saturated zone of the bed up to a bottomhole of the well. Borehole is enlarged in this interval and is filled with isolating composition corresponding to cement grout. When thickness of the oil-saturated zone of the bed is below 4 metres, then a part of casing string is cut out from the roof of the impermeable natural interlayer to the bottomhole of the well. The borehole of the well is enlarged in this interval and is filled with isolating composition. There is formed a packer by introduction into the bottomhole zone of the oil-saturated zone of the well bed.

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2 cl, 4 dwg

FIELD: oil and gas production.

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3 dwg

FIELD: oil and gas production.

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FIELD: oil and gas industry.

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2 tbl, 2 ex

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2 tbl

FIELD: oil extractive industry.

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1 tbl

FIELD: oil extractive industry.

SUBSTANCE: method includes pumping, in carrying liquid - waterless mixture of oil products containing waterless oil, of powder-like water-soluble polymer and connector in amount of 0.05-0.2% for mass of carrying liquid or 30-100% for mass of power-like water-soluble polymer, as said mixture a mixture of waterless oil and light oil products processed in relation 0.1:9.9-9.9:0.1 is used, and as connector - dry aluminum sulfate, chrome sulfate, iron sulfate, magnesium sulfate, copper sulfate or their mixtures, or their alums with common formula MIMIII(SO4)

.2
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2 tbl

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7 cl, 1 ex

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EFFECT: higher efficiency.

8 ex, 2 tbl

FIELD: oil and gas industry.

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EFFECT: higher precision.

2 cl, 2 dwg, 1 ex, 1 tbl

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