Method of development of low-permeable oil deposits

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil production industry and can be used during development of pure oil deposits with low-permeable reservoirs. Method of development of low-permeable oil deposits includes drilling of the production and injection wells as per in-line development system using the hydraulic fracturing in all wells. Rows of injection and production wells are arranged in parallel and alternating by one in direction of the maximum horizontal stresses of the reservoir. At that the production and injection wells are drilled with horizontal bores in direction of the maximum horizontal stresses with multi-stage hydraulic fracturing.

EFFECT: increased rate of oil extraction and reduced density of wells grid.

3 dwg, 2 ex

 

The way to develop low-permeability oil reservoirs

The invention relates to oil industry and may find application in the development of pure oil reservoirs with low-permeability reservoirs.

A method of developing oil deposits with low-permeability reservoir, according to which mining and discharge deviated wells are drilled by precision system design, hydraulic fracturing, all the wells, placing the rows of injection and production deviated wells with alternating through one in the direction of maximum horizontal stress of the formation. In a number of injection deviated wells are scattered through one [the choice of the optimal system design for fields with low-permeability reservoirs. / V. A. Baikov, R. M. Zhdanov, T. I. Mullagaliev, Usmanov T. S. // Oil and gas business. - 2011. - № 1].

The main disadvantage of this method is the low technical and economic efficiency, which is associated with a low rate of oil withdrawal and high density of the grid wells.

The closest to the proposed technical solution is the way to develop low-permeability oil reservoirs, including the drilling of production and injection wells in row a development system with hydraulic fracturing on sexsquirting, by placing a series of production and injection wells in parallel with alternating through one in the direction of maximum horizontal stress of the formation [Technical and economic analysis of development systems, formed by wells with hydraulic fracture / M. M. KHASANOV et al. / / Oil industry - 2009. - No. 2. Pp. 92-96]. The disadvantage of this technical solution is the use of deviated wells, the application of which in low-permeability reservoirs is unprofitable because of low rates of producing wells.

The main task of the presented method is cost-effective development of low permeability oil reservoirs. The technical result is an increase in the rate of extraction of oil, increase reservoir sweep flooding by increasing the likelihood of involvement in the development of isolated sand bodies and reducing the density of the grid wells with preservation or increase of oil recovery factor.

The problem is solved in that in the method of development of low permeability oil reservoirs, including the drilling of production and injection wells in row a development system with hydraulic fracturing, all the wells, placing the rows of injection and production wells in parallel and interleaved one in the direction of maximum horizontal stress PL�hundred, according to the invention for production and injection wells drilled with horizontal shafts in the direction of maximum horizontal stress with holding them with MSS.

Low-permeability sandy-silty deposits are characterized by high lateral (area) of disconnection collectors. The application of horizontal production and injection wells with multiple hydraulic fracturing increases the likelihood of involvement in the development of isolated sand bodies. the Application of horizontal wells with multiple hydraulic fracturing in isolation from waterflood enable to increase the rate of extraction of oil only slightly. All the distinctive features in conjunction with all the essential features allows to obtain a synergistic technological effect and will allow the development of cost-effective low-permeability reservoirs. In particular, the drilling of separate horizontal wells with multistage fracturing can significantly improve the flow rates of the liquid immediately after running well to the work, however, if you do not organize an effective system of reservoir pressure maintenance, then as soon as the debit individual horizontal wells will drop significantly down to zero. In the case of a perpendicular arrangement of the horizontal wellbore fracturing and cracks in the discharge of SLE�gine can occur induced crack growth in an injection well in the direction of the horizontal wellbore, hereby irrevocably Obvodny her. Thus, only the decision of the joint selection of the optimal type of well completions and the organization of an effective maintenance system that is proposed in the invention, will provide a synergistic effect.

The method is as follows.

Oil field drill horizontal mining and horizontal injection wells. Rows of horizontal production and injection wells with multistage fracturing alternate one. The direction of horizontal wells production and injection wells are placed in the direction of maximum horizontal stress of the formation. On all horizontal wells is carried out with MSS.

Example 1.

For deposits of oil fields, developed by devyatietazhnoe and row development system with hydraulic fracturing deviated wells (the prototype), the section of the field (Bush) additionally razvarivat of the proposed system development. Fig. 1 presents the proposed mining system, according to which horizontal production and injection horizontal wells are drilled row on a development system with hydraulic fracturing, all the wells, with horizontal production wells is carried out multi-stage fracturing. In this series of discharge Horiz�al settings and extractive horizontal wells with alternating one feature in the direction of maximum horizontal stress of the formation. The length of the horizontal wellbore 1000 m. the Distance between rows of injection and production wells 300 m. On horizontal wells completed 5-7 stages of hydraulic fracturing.

Fig. 2 shows the dynamics of changes in average flow rate of the liquid of the wells drilled by the known (prototype) and the proposed development systems (TOS with MHF). From Fig. 2 shows that the average fluid flow rates of the horizontal wells drilled by the proposed development, exceeds the average flow rates of the fluid directional wells drilled by well-known development system (prototype) 3 times.

Example 2.

For the section under consideration deposits created by the hydrodynamic model with the placement of production wells in three rows of three wells in a row, with a distance between rows of wells of 300 m, with a hydraulic fracture half-length is 100 m and auto-frac - 350 m. the Calculated two variants of development of downhole pressure on production and injection wells 8 MPa and 45 MPa respectively:

Option 1 (the proposed development), according to the invention, nine producing wells with horizontal completion and 12 horizontal injection wells. The length of the horizontal section of wells 1000 m of the injection wells is 800 m. the horizontal Distance between the producing wells in row 300 m. the borehole spacing �leaves 42 Acres on the well.

Option 2 (prototype), prototype, twelve producing directional wells and 28 discharge deviated wells with the location of extractive directional wells in four rows of seven holes in a row. The distance between the rows of wells - 325 m, the distance between extracting extended reach wells in row - 500 m, the distance between the discharge extended reach wells in row 1000 m. the borehole spacing is 25 Hectares on the well.

Fig. 3 shows the calculation results of both options. From Fig. 3 shows that cumulative production per well according to Embodiment 2 (prior art) is significantly lower cumulative production per well for Option 1 (the proposed development).

Thus the use of the invention allows to obtain the effect by increasing the extraction of oil, maintaining a high recovery factor of oil and lower capital construction costs by reducing the mesh density of wells.

The way to develop low-permeability oil reservoirs, including the drilling of production and injection wells in row a development system with hydraulic fracturing (HF) of all the wells, placing the rows of injection and production wells in parallel and interleaved one in the direction of maximum horizontal�'s stress layer, characterized in that the producing and injection wells are drilled with horizontal shafts in the direction of maximum horizontal stress with implementation of multistage fracturing them.



 

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12 cl, 3 dwg

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