Device for determining water influx intervals and water influx isolation in slanted and horizontal wells

FIELD: oil production industry, particularly methods or devices for cementing, for plugging holes, crevices, or the like.

SUBSTANCE: device comprises inflatable packers to be lowered into well along with flow string. One flow string end is closed to provide simultaneous well bore packing, another end is connected to production equipment. Flow string is provided with centralizers located near inflatable packers. Formed in flow string are additional holes located opposite to packers. Well pump is installed inside flow string. High-pressure water conduit having low diameter is connected to above holes. Flow string has perforated orifices created between inflatable packers.

EFFECT: extended operational capabilities.

1 dwg

 

The proposal relates to the oil and gas industry, in particular to a device for determining the inflow intervals and their isolation in deviated and horizontal wells wells, for example, during repair and insulation works, and can be used in cased cemented wells.

Known equipment used in remedial cementing operations in horizontal wells (see “Oil industry”, No. 2, 2003, 49-50)containing the column tubing and two inflatable packer.

The disadvantage is that the packers do not seal interval isolation, and create a hydraulic resistance to the displacement of the fluid in the interval isolation. When re-operation for isolation of water shut-off interval, i.e. when promoting device, mixing and squeezing the liquid and the liquid blocking, which ultimately leads to a significant reduction in the quality of the water shut-off.

Closest to the proposed utility model technical essence is “a Device to disable the inflow of formation water in the wells with a horizontal bottom (see application No. 2002133608/20 (036198) from 18.12.2002; the Decision on the issuance of a certificate for a utility model from 12.03.2003), including lowered on the column tubing inflatable packers, one to ncov tubing muted to allow for the simultaneous Petrovci wellbore, and the other attached to the operational equipment, and tubing made channels opposite the producing formation. In addition, tubing opposite the inflatable packers made additional holes are straight valves and mechanism of pressure relief for each of the inflatable packer, the channels of tubing installed check valves, and inside tubing installed submersible pump and tubing equipped with an additional centralizers, which are located in close proximity to the inflatable packers.

The disadvantages of the prototype are:

- the impossibility of sampling fluid from zapatenovannuyu zone for analysis of water production and, as a consequence, there is no guarantee that spacerowa aquifer area;

- the inability water shutoff;

with each repeated use of the device requires tripping operations, which in horizontal wells time-consuming and costly.

The technical objective of the proposed device for determining the inflow intervals and their isolation in deviated and horizontal wells wells is expanding its functionality due to the possibility of sampling is hidcote from any perforation interval; injection of water in the aquifer intervals; reduce material costs with the exception of the additional tripping operation and the possibility of multiple use of the present device.

The technical problem is solved by the proposed device for determining the inflow intervals and their isolation in deviated and horizontal wells wells, including lowered on the column tubing inflatable packers, with one end of the tubing is muted to allow for the simultaneous Petrovci wellbore, and the other is attached to the operating equipment, and tubing equipped with centralizers, which are located in close proximity to the inflatable packers, opposite which in tubing made extra holes, and inside tubing installed submersible pump.

What's new is that additional holes in the tubing summed up the high pressure conduit of small diameter, and tubing between the inflatable packers have the perforations.

Analysis of the known similar solutions allows to make a conclusion about the absence of these signs, similar to the distinctive features in sawse the second device, i.e. on the conformity of the proposed solutions to the criterion of “significant differences”.

The drawing shows a device for determining the inflow intervals and their isolation in deviated and horizontal wells wells with partial axial cross-section.

Device for determining the inflow intervals and their isolation in deviated and horizontal wells wells 1 (see drawing), equipped with a production column 2 and cement ring 3 includes lowered on the column tubing 4 inflatable packers 5, with one end 6 of tubing 4 is muted for simultaneous Petrovci wellbore 1 and the other 7 are attached to the operational equipment 8, and tubing 4 between the inflatable packers 5 performed the perforations 9. Through the perforations 9 is used to supply fluids to the oil reservoir which is connected with the annular space of wells 1 through the perforations 11, passing through the production casing 2 and the cement ring 3. In tubing 4 opposite the inflatable packers 5 made additional holes 12, which are connected with high-pressure conduit 13. Inside tubing 4 has a pump 14, and tubing the tube 4 is further provided with a centralizers 15, located in close proximity to the inflatable packers 5.

The device operates as follows.

Before descending the well 1 is washed and subluminous descent pattern along the entire length, then the perforation interval provide schreberiana - cleaning of the surface casing 2. On the tubing pipes have 4 inflatable packers 5 centralizers 15. Then through additional holes 12 inflatable packer 5 is connected with a high-pressure conduit 13. Next, one end 6 of tubing 4 choke, and another 7 install the necessary operating equipment.

This design on the column tubing 4 is lowered into the borehole 1 to achieve the perforations 11, and the centralizers 15 is not allowed to adhere to the walls of the casing 2 inflatable packers 5. Then the high pressure conduit 13 water under pressure and the inner space of the inflatable packer 5 is filled, overlapping intervals of perforations 11 of the casing 2. Valves for high-pressure conduit 13 and the pressure gauge installed at the wellhead 1 (Fig. not shown). Then descend deep pump 14 and sahakaranagar interval selected fluid sample. At high water production in this same spacerow the config interval pumped water composition. The success of the waterproofing works is determined by repeated analysis of well production, selected from sahakaranagar interval. When obtaining anhydrous oil relieve pressure in the high pressure conduit 13 by opening valves at the wellhead. When this inflatable packer 5 is transferred to a transport condition. Further, the proposed device is moved by a distance equal to the distance between the inflatable packers 5, and the cycle resumes. After researching all of the perforated interval and holding, if necessary, waterproofing works well operated deep-well pump 14, which is installed at the desired depth.

Device for determining the inflow intervals and their isolation in deviated and horizontal wells wells allows you to extend the functionality due to the possibility of sampling fluid from any of the perforated interval; injection of water in the aquifer intervals; reduce material costs with the exception of the additional tripping operation and the possibility of multiple use of the present device.

Device for determining the inflow intervals and their isolation in deviated and horizontal wells wells, including lowered on the column pump comp is issarny tubes inflatable packers, while one end of the tubing is muted to allow for the simultaneous Petrovci wellbore, and the other is attached to the operating equipment, and tubing equipped with centralizers, which are located in close proximity to the inflatable packers, opposite which in tubing made extra holes, and inside tubing installed submersible pump, wherein the additional holes in the tubing summed up the high pressure conduit of small diameter, and tubing between the inflatable packers have the perforations.



 

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