Oil reservoir development method (variants)

FIELD: oil industry, particularly development of oil reservoir penetrated by horizontal wells.

SUBSTANCE: method involves drilling wells; injecting working agent through a number of injection wells and recovering oil through a number of production wells arranged in parallel to injection ones, in dependence of oil viscosity. In above method vertical or horizontal wells are bored. If oil mobility index M≥2.5 vertical injection and horizontal production wells are bored. If oil mobility index is 0,4<M<2.5 horizontal wells are drilled. If oil mobility index M≤0.4 horizontal injection and vertical production wells are bored.

EFFECT: increase efficiency.

4 cl, 8 dwg

 

The invention relates to the oil industry and can find application in the development of oil deposits drilled horizontal wells.

There is a method of developing oil deposits, including oil extraction, injection of the working agent in cyclic mode through a horizontal well, located crosswise with perpendicular arrangement (U.S. Pat. Of the Russian Federation No. 2166070).

The disadvantage of this method is the reduction of reservoir sweep drainage and exposure due to stagnant zones in areas mutually perpendicular arrangement of the intake and production wells horizontal type.

Closest to the claimed method is the development of oil deposits, ("Areal flooding of oil fields", Retvalue, 1979, p.47-50)containing the injection of working agent through a series of vertical injection wells, oil extraction through a series of vertical extraction wells parallel to the row of injection wells.

The disadvantage of this method is the low enrolment rate of reservoir drainage and exposure.

In the present method the development of oil deposits containing well drilling, pumping the working agent through a series of injection wells and oil extraction through a series of extraction wells, the parallel number magnetfeld the x wells, when the mobility of the oil in the reservoir M≤0,4 Buryats horizontal discharge and vertical production wells.

In the present method the development of oil deposits containing well drilling, pumping the working agent through a series of injection wells and oil extraction through a series of wells parallel to the row of injection wells, when the mobility of the oil deposits of 0.4<M<2,5 injection and production wells are drilled horizontally.

In the present method the development of oil deposits containing well drilling, pumping the working agent through a series of injection wells and oil extraction through a series of wells parallel to the row of injection wells, when the mobility of the oil deposits of 0.4<M<2.5 and the total length of horizontal wells injection and production wells less than 0.6 unit length of the element area deposits, injection and production wells are drilling horizontal and are arranged staggered relative to each other.

In the present method the development of oil deposits containing well drilling, pumping the working agent through a series of injection wells and oil extraction through a series of wells parallel to the row of injection wells, when the mobility of the oil in the reservoir M≥2,5 Buryats vertical injection and horizontal production wells.

When the mobility of the oil in the reservoir 0,4 ated and less to meet the conditions of the material balance, the optimum length of the horizontal shafts reaches a value at which the performance of a horizontal production well equal performance respectively vertical and horizontal well must be replaced on less capital-intensive vertical production well. This conclusion is substantiated found dependencies for the cost of horizontal wells, as well as the relative values of the horizontal and vertical sections from the horizontal stretch of the trunk ("evaluation of the effect of the length of the horizontal wellbore on the cost of construction of horizontal wells". Syromyatnikov Y.S. and other "Construction of oil wells on land and at sea", 2000, No. 6-7, p.20-23).

Horizontal wells have greater drainage area, in comparison with the vertical. Parallel horizontal wells relative to each other stabilizes the magnitude of the pressure gradient in the reservoir and reduces the likelihood of zones with pressure gradients below the gradient shift oil (dead zones). This allows you to increase the sweep effect.

Chess placement of production and injection wells relative to each other when the mobility of the oil deposits of 0.4>the< 2.5 and the total length of horizontal wells injection and production wells less than 0.6 unit length of the element in the development of oil deposits, increasing enrolment ratio in comparison with the line of the frontal placement of the wells due to the interference effect. Using inline chess placement of wells specified enrolment ratio can be obtained with a smaller length of length of horizontal boreholes, respectively, at a lower cost for the construction of wells. If exceeded, the total length of horizontal wells injection and production wells 0,6 single length element of the development of oil deposits, the coverage ratio is the same for row chess and row frontal placement of production and injection wells relative to each other.

When the mobility of the oil in the reservoir 2,5 ated and more optimal length of the horizontal wellbore injection wells decreases and reaches values typical for extracting a horizontal well in an unstable front oil displacement and premature water breakthrough. At the same time to perform a material balance of the horizontal injection well may be replaced by a vertical injection wells.

Figure 1 shows the dependence of the coverage ratio element sales is the total length of the horizontal wellbore injection and production wells at different layouts wells.

Figure 2 shows the dependence between the total length of the horizontal wellbore injection and production wells on the mobility of oil at a maximum coverage rate.

Figure 3, 5, 7 show, respectively, the existing technological schemes of horizontal wells to develop oil deposits Vereisky objects Lozinsky, plot, Senasag field. Izhevsk field and the Northern section of the Angola dome Mishkinskoye field.

4, 6, 8 shown, respectively, in the proposed technological scheme with in-line arrangement of horizontal wells for development of oil deposits Vereisky objects Lozinsky, plot, Senasag field. Izhevsk field and the Northern section of the Angola dome Mishkinskoye field.

Shows the dependencies (1, 2) based on the analysis of the results of the development of verey horizon deposits of Udmurtia. Productive oil-bearing stratum have a small effective thickness with oil viscosity at reservoir conditions from 3.0 to 150 MPa·C. as the base object was seen South Changable field. Productive oil-bearing stratum have a small effective thickness with oil viscosity at reservoir conditions 8,0 MPa·C.

Optimal placement of Gori is ostalnyh wells from the point of view of the value of the coverage factor - this line (figure 1). The most profitable scheme with in-line chess placement of horizontal wells.

The optimal choice of in-line placement of horizontal wells is confirmed by the comparison of the efficiency of the existing technological schemes of placement of horizontal wells for development of oil deposits Vereisky objects Lozinskiy plot Senasag field, whole field, There raising Mishkinskoye field and the Northern section of the Angola dome Mishkinskoye field (respectively 3, 4, 5, 6) with the proposed technological schemes with in-line arrangement of horizontal wells (respectively 7, 8, 9, 10). The comparison was carried out using a three-dimensional geological and hydrodynamic models for three-phase filtration reservoir fluid. To create a three-dimensional geological model applied software package GeoFrame 3.8. The construction of the hydrodynamic model was performed using programs EGLIPSE-100. Analysis of the results showed that the proposed technological scheme allows to increase enrolment layer effects do not reduce the rate of selection and to premature water breakthrough. The extraction rates for the proposed process flow, respectively, 5%, 8%, 6% and 7% higher than those for existing the technological schemes with the use of horizontal wells.

The inventive method allows the cost-effective to provide a high coverage factor for oil of any viscosity by reducing dead zones in the development of oil deposits.

1. The way of the development of oil deposits containing well drilling, pumping the working agent through a series of injection wells and oil extraction through a series of wells parallel to the row of injection wells, characterized in that when the mobility of the oil in the reservoir M≤0,4 Buryats horizontal discharge and vertical production wells.

2. The way of the development of oil deposits containing well drilling, pumping the working agent through a series of injection wells and oil extraction through a series of wells parallel to the row of injection wells, characterized in that when the mobility of the oil deposits of 0.4<M<2,5 injection and production wells are drilled horizontally.

3. The method of developing a petroleum reservoir according to claim 2, characterized in that when the total length of horizontal wells injection and production wells less than 0.6 unit length of the element square reservoir production and injection wells are arranged staggered relative to each other.

4. The way of the development of oil deposits containing well drilling, pumping the working agent through a series of injection wells and selection of the nave and through a series of extraction wells, parallel row of injection wells, characterized in that when the mobility of the oil in the reservoir M≥2,5 Buryats vertical injection and horizontal production wells.



 

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