CN109577942B - Excavation and submergence method for residual oil in dominant seepage channel development reservoir - Google Patents
Excavation and submergence method for residual oil in dominant seepage channel development reservoir Download PDFInfo
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Abstract
The invention relates to a method for excavating residual oil in a dominant seepage channel development oil reservoir, belonging to the technical field of petroleum geological development. Firstly, calculating scale parameters of the dominant seepage channel according to data of all single wells in a target area, and establishing a three-dimensional geological model representing the characteristics of the dominant seepage channel according to the obtained scale parameters; then according to a three-dimensional geological model representing the characteristics of the dominant seepage channel, performing numerical reservoir simulation to realize quantitative description of the residual oil based on the dominant seepage channel and determining a residual oil distribution mode; and finally, dividing the residual oil distribution mode into a plane residual oil distribution mode and a section residual oil distribution mode, and performing dredging and blocking according to the residual oil at different positions of the dominant seepage channel by adopting corresponding dredging and blocking dredging and submerging means. According to the invention, comprehensive dredging and potential dredging measures are adopted for residual oil at different parts of the dominant seepage channel in a targeted manner, the energy of water injected into the dominant seepage channel is reasonably utilized to dredge the residual oil, and the development effect of the oil reservoir is improved.
Description
Technical Field
The invention relates to a potential excavation method for residual oil in an oil reservoir developed by an advantage seepage channel, and belongs to the technical field of petroleum geological development.
Background
In the process of oil-gas water injection development, the pore throat channel with relatively high-speed seepage formed by long-time water drive exploitation of a reservoir has strong mutation relationship between the attribute parameters and fluid seepage characteristics of the pore throat channel and adjacent regions, and the part with stronger flow conductivity is called as a dominant seepage channel. In the later stage of development of an oil field, due to the fact that injected water is washed for a long time, the advantage seepage channel is easily formed in a reservoir stratum with high permeability, the formation of the advantage seepage channel plays an important role in fluid distribution and migration, and the formation and the distribution of remaining oil are influenced and controlled, so that the advantage seepage channel is effectively treated, and the method has important significance in digging the remaining oil in the reservoir stratum and improving the oil reservoir development effect.
The existing method for developing residual oil in an oil reservoir by using a potential dominant seepage channel mainly comprises the following aspects:
(1) well pattern adjustment: through drilling the encrypted well or the renewal well, the old well is sidetracked, the stratum is changed and the injection and production well category is changed, the injection and production relation is perfected, the liquid flow direction is changed, the plane contradiction of the reservoir stratum is reduced, and the oil reservoir development effect is improved. For example, "adjustment practice and knowledge of injection and production well pattern in the winning area" published in petrochemical technology "in 6 months in Zhang Yan 2015, well pattern adjustment is carried out by drilling a small number of new wells and layer changing measures of old wells, so as to achieve the purposes of improving the well pattern, improving the water driving degree and excavating the potential of residual oil.
(2) Adjusting the structure of water injection and liquid production in the layer: the water well is used for plugging a water flooded part with good physical property in the layer by subdividing water injection in the layer, and water injection at a poor part in the reinforcing layer is used to realize adjustment of a water injection structure in the layer; the oil well realizes the adjustment of a liquid production structure through subdivision water plugging and selective hole patching in the layer, and submerges the residual oil. For example, "water drive development and adjustment policy research in ultra high water-cut period of Madian oil field" published in the 2 nd period 2015 of the Haosansong 2015 in 2 months ", water injection is subdivided in an implementation layer in the Madian oil field, a liquid production structure in the adjustment layer is adjusted, the yield of the oil field is decreased progressively, and the water-cut rising speed is effectively controlled.
(3) Profile control and flooding control: by profile control and profile control, the water injection rate and the water yield of the dominant seepage channel are controlled, the contradiction in the reservoir stratum is reduced, the water drive wave and volume are enlarged, and the water drive recovery ratio of the oil reservoir is improved. If the 'application of the dominant channel identification technology in the surplus oil field' published in 2011, 4 th month in 2011 in 4 th month in Wanghong flood indicates that the surplus oil production plant performs the measures of profile control and flooding on the dominant seepage channel, the daily oil increase of a block single well is 0.2 ton, the economic efficiency of the measures of 41 profile control wells and 14 profile control and flooding wells is more than 85 percent, and better economic benefit is obtained.
The density of the well pattern is higher in the later development stage and is limited by the drilling cost and the residual recoverable reserve controlled by a single well, and the implementation difficulty of well pattern encryption is increased; the adjustment of the structure of water injection and liquid production in the stratum requires that a relatively stable interlayer is arranged in the range of an injection and production well group, and part of wells cannot be effectively implemented due to the limitation of well conditions and reservoir conditions; profile control and profile control are limited by the cost and performance of the plugging agent, and limited in the effect of reducing plane and in-layer contradiction, wherein the application range of the organic chemical plugging agent is easily limited by the conditions of oil reservoir temperature, mineralization degree and the like, and for a sandstone-cemented loose heterogeneous oil reservoir, the plugging dominant seepage channel has poor effect, short effective period, serious sand production and poor development effect.
At present, the excavation and submergence method for the residual oil of the dominant seepage channel is mainly focused on means of profile control, water shutoff and other blocking, because the flow direction is not increased and adjusted, injected water easily flows along the original dominant seepage channel or the dominant seepage channel is formed again, the extraction degree of an oil reservoir is relatively low, and the development effect is poor.
Disclosure of Invention
The invention aims to provide a method for excavating residual oil in an oil reservoir developed by a dominant seepage passage, which aims to solve the problem that the oil reservoir extraction degree is relatively low due to the fact that the existing method for excavating the residual oil in the dominant seepage passage is heavier than the means of profile control, water shutoff and the like.
The invention provides a potential excavation method for residual oil of an oil reservoir developed by a dominant seepage channel to solve the technical problems, which comprises the following steps:
1) calculating scale parameters of the dominant seepage channel, including extension length, thickness, width, curvature, porosity and permeability, according to core data, logging data, testing data, well testing data and dynamic data of all single wells in the target area, and establishing a three-dimensional geological model representing the characteristics of the dominant seepage channel according to the obtained scale parameters;
2) according to a three-dimensional geological model representing the characteristics of the dominant seepage channel, performing numerical reservoir simulation to realize quantitative description of residual oil based on the dominant seepage channel and determining a residual oil distribution mode;
3) and dividing the residual oil into a plane residual oil distribution mode and a section residual oil distribution mode according to different positions of the residual oil in the advantageous seepage channel, and performing dredging and blocking by adopting corresponding dredging and blocking potential means according to the residual oil distribution mode.
Furthermore, the plane residual oil distribution mode is divided according to the distribution position of the residual oil on the plane of the dominant seepage channel, and comprises the residual oil at the tail end of the dominant seepage channel, the residual oil on the side wing of the dominant seepage channel and the residual oil in the dominant seepage channel.
Furthermore, for the residual oil at the tail end of the dominant seepage channel, adopting the measures of perfecting a well pattern and plugging a water outlet layer to keep the stratum energy, and simultaneously selectively filling holes in the oil well at the tail end of the dominant seepage channel, and adopting a dredging and plugging combined method to carry out excavation and submergence; for the residual oil on the side wing of the dominant seepage channel, measures of transferring injection, recovering water injection, plugging and shutting down a high-water-content oil well are adopted, the stratum energy of the dominant seepage channel is increased, and the side wing performs excavation and submergence by deploying a new well to perfect a well pattern, selectively filling holes of the oil well, fracturing a thin difference layer and acidizing; for the residual oil in the dominant seepage channel, the measures of pumping thin well pattern, enlarging the injection-production well distance, reversing water injection and periodically injecting water are adopted, and the method of expanding the injected water wave and volume is used for carrying out excavation and submergence.
Furthermore, the profile residual oil distribution mode is divided according to the distribution position of the residual oil in the longitudinal direction of the dominant seepage channel, and comprises the residual oil at the top of the dominant seepage channel, the residual oil in the middle of the dominant seepage channel and the residual oil at the bottom of the dominant seepage channel.
Furthermore, for the residual oil on the top of the dominant seepage channel, carrying out excavation and submergence by adopting a method of water well profile control, in-layer subdivision water injection, in-layer subdivision water plugging of an oil well and rhythm section hole filling; for the residual oil in the middle of the dominant seepage channel, adopting a method of oil well extract, selective water plugging and periodic water injection of a water well to carry out excavation and submergence; and (4) for the residual oil at the bottom of the dominant seepage channel, carrying out excavation and submergence by adopting a method of hole filling of an oil well rhythm section, water well profile control and water injection subdivision in the layer.
Furthermore, the three-dimensional geological model for characterizing the dominant seepage channel characteristics is established by adopting a random modeling method.
Furthermore, the test data comprises data of pressure drop test, water absorption profile, water absorption indication curve, fluid production profile, residual oil monitoring and tracer monitoring; the logging information comprises data information of conventional logging and production logging; the well testing data comprises data information of pressure drop well testing and interference well testing.
The method has the advantages that firstly, the scale parameters of the dominant seepage channel are calculated according to the data of all single wells in the target area, and a three-dimensional geological model representing the characteristics of the dominant seepage channel is established according to the obtained scale parameters; then according to a three-dimensional geological model representing the characteristics of the dominant seepage channel, carrying out numerical reservoir simulation, realizing quantitative description of residual oil based on the dominant seepage channel, and determining a residual oil distribution mode; and finally, dividing the residual oil distribution mode into a plane residual oil distribution mode and a section residual oil distribution mode, and carrying out dredging according to the residual oil distribution mode by adopting corresponding dredging and blocking dredging and submerging means. The invention adopts comprehensive dredging and blocking combined potential digging measures for residual oil at different parts of the dominant seepage channel in a targeted manner, reasonably utilizes the energy of the injected water in the dominant seepage channel to dig the residual oil, and improves the development effect of the oil reservoir.
Drawings
FIG. 1 is a flow chart of the method for mining remaining oil in a dominant seepage channel developing reservoir according to the present invention;
FIG. 2-a is a schematic diagram of a well pattern deployment prior to tuning of a hu 12-152 well group in an embodiment of the present invention;
fig. 2-b is a well pattern deployment schematic diagram of a hu 12-152 well group adjusted in an embodiment of the invention.
Detailed Description
The following description will further describe embodiments of the present invention with reference to the accompanying drawings.
In the later development stage of water flooding oil reservoir development, the formation of the dominant seepage channel in the reservoir causes ineffective circulation of injected water, reduces the swept volume of the injected water, greatly reduces the oil reservoir recovery ratio and seriously influences the water flooding development effect. How to reduce the adverse effect of the dominant seepage channel on the development effect has important significance for improving the ultimate recovery ratio of the oil reservoir, but the adverse effect brought by the dominant seepage channel is difficult to solve by a single measure.
Therefore, the invention provides a potential excavation method for residual oil in an oil reservoir developed by a dominant seepage channel, which comprehensively treats the dominant seepage channel of the oil reservoir in a dredging and blocking combined mode, can greatly reduce the adverse effect of the dominant seepage channel on development, and improves the final recovery ratio of the oil reservoir. The method comprises the steps of firstly, establishing a three-dimensional geological model representing the characteristics of a dominant seepage channel according to geological data of a target area; then according to a three-dimensional geological model representing the characteristics of the dominant seepage channel, carrying out numerical reservoir simulation, realizing quantitative description of residual oil based on the dominant seepage channel, and determining a residual oil distribution mode; and finally, dividing the residual oil distribution mode into a plane residual oil distribution mode and a section residual oil distribution mode, and carrying out dredging according to the residual oil distribution mode by adopting corresponding dredging and blocking dredging means. The flow of the method is shown in fig. 1, and is explained in detail below by taking the example of the residual oil potential excavation of the hu 12-152 well group developed by the traditional Chinese oil field hu 12 dominant seepage channels, and the specific implementation steps are as follows.
1. And establishing a three-dimensional geological model representing the characteristics of the dominant seepage channel according to geological data.
Firstly, calculating scale parameters of a dominant seepage channel, including extension length, thickness, width, bending degree, porosity and permeability, by using core, logging, testing, well testing and production dynamic data of all single wells in a target area; and then, establishing a three-dimensional geological model representing the characteristics of the dominant seepage channel by using the scale parameters of the dominant seepage channel by adopting a random modeling method. The data information of the test comprises data information of a pressure drop test, a water absorption profile, a water absorption indication curve, a liquid production profile, residual oil monitoring and tracer agent monitoring; the logging data comprises data of conventional logging and production logging; the data information of the well test comprises data information of pressure drop well test and interference well test.
In the embodiment, the core, the logging, the testing, the well testing, the sedimentary facies and the dynamic production data are comprehensively utilized to depict the distribution of the dominant seepage channels of the Hu 12-152 well group on the plane and in the longitudinal direction, the scale parameters of the dominant seepage channels are quantitatively calculated, and a three-dimensional geological model of the dominant seepage channels between the water well Hu 12-152 and the oil wells 12-153 is established by utilizing geological modeling software under the control of the sedimentary facies.
2. And realizing quantitative description of the residual oil based on the dominant seepage channel by utilizing numerical reservoir simulation software according to the obtained three-dimensional geological model representing the characteristic of the dominant seepage channel, and determining a residual oil distribution mode.
The invention divides the remaining oil distribution mode based on the dominant seepage channel into two types: a planar residual oil distribution pattern and a profile residual oil distribution pattern.
In this embodiment, a numerical reservoir model is established on the basis of the three-dimensional geological model of the dominant seepage passage of the hu 12-152 well group, and the current remaining oil distribution is determined through numerical reservoir simulation, as shown in fig. 2-a, the hu 12-152 well group belongs to a plane remaining oil distribution mode, including the remaining oil on the flank of the dominant seepage passage and the remaining oil at the tail end of the dominant seepage passage.
3. And aiming at the determined residual oil distribution mode based on the dominant seepage channel, a targeted diving method is formulated.
The plane residual oil distribution mode based on the dominant seepage channel comprises the following steps: the oil is left at the tail end of the dominant seepage channel, the oil is left at the flank of the dominant seepage channel, and the oil is left in the dominant seepage channel. The three profile residual oil distribution modes based on the advantage seepage channel comprise the residual oil at the top of the advantage seepage channel, the residual oil in the middle of the advantage seepage channel and the residual oil at the bottom of the advantage seepage channel. The diving method established aiming at different residual oil distribution modes comprises the following steps:
For the remaining oil at the end of the dominant seepage channel: and measures such as well pattern improvement, water outlet layer plugging and the like are adopted, the stratum energy is kept, meanwhile, holes are timely and selectively repaired for the oil wells positioned at the tail ends of the dominant seepage channels, and the potential is excavated by a dredging and plugging combined method. For the dominant seepage channel flank residual oil: measures such as transfer injection, recovery water injection, plugging and shut-down of a high water-content oil well are adopted, the stratum energy of the dominant seepage channel is increased, and the flanks are excavated and submerged by a dredging and plugging combination method such as well pattern improvement, selective hole patching of the oil well, thin differential fracturing and acidification through new well deployment. And for residual oil in the dominant seepage channel, adopting methods of pumping thin well pattern, enlarging injection and production well distance, reversing water injection, periodically injecting water and expanding injected water wave and volume to excavate and submerge. Aiming at the residual oil at the top of the dominant seepage channel: adopting the methods of water well profile control, in-situ subdivision water injection, in-situ subdivision water plugging of an oil well and rhythm section hole patching to excavate and submerge. For the remaining oil in the middle of the dominant seepage channel: adopts oil well extract, selective water plugging and periodic water injection of a water well. For the remaining oil at the bottom of the dominant seepage channel: the method adopts the oil well rhythm section hole filling, the water well profile control and the underground subdivision water injection.
In the embodiment, the residual oil on the side wings and the tail ends of the dominant seepage channels of the hu 12-152 well groups is enriched, and the dredging and dredging combination mode is adopted for carrying out dredging and submerging. On one hand, the water well hu 12-152 implements measures of air foam injection, mechanical water plugging and the like, and plugs a main water outlet layer in the dominant seepage channel, so that the invalid water injection amount in the dominant seepage channel is reduced, and meanwhile, the oil well hu 12-153 is plugged, so that the invalid liquid production amount in the dominant seepage channel is reduced, and the formation energy is kept; on the other hand, hole supplementing measures are taken for the oil wells Hu 10-37 on the side wings of the advantageous seepage channels, residual oil is excavated on the side wings of the potential advantageous seepage channels, and hole supplementing measures are taken for the oil wells Hu 12-28 on the tail ends of the advantageous seepage channels, and residual oil is excavated on the tail ends of the potential advantageous seepage channels.
Through the measures, the oil increase of the whole well group is accumulated to be 731 tons, and the recovery ratio is improved by 2.9 percentage points. In addition, in order to further improve the oil reservoir recovery ratio, the next step can plan to shut down the Hu 12-152 wells, adopt Hu 12-55 wells for water injection, enlarge the injection-production well spacing, and simultaneously conduct reverse water injection on the Hu 12-65 wells so as to increase the water flooding swept volume.
Claims (3)
1. A potential excavation method for residual oil of a dominant seepage channel development oil reservoir is characterized by comprising the following steps:
1) Calculating scale parameters of the dominant seepage channel, including extension length, thickness, width, curvature, porosity and permeability, according to core data, logging data, testing data, well testing data and dynamic data of all single wells in the target area, and establishing a three-dimensional geological model representing the characteristics of the dominant seepage channel according to the obtained scale parameters;
2) according to a three-dimensional geological model representing the characteristics of the dominant seepage channel, performing numerical reservoir simulation to realize quantitative description of the residual oil based on the dominant seepage channel and determining a residual oil distribution mode;
3) dividing the residual oil into a plane residual oil distribution mode and a section residual oil distribution mode according to different positions of the residual oil in the dominant seepage channel, and carrying out dredging and blocking by adopting corresponding dredging and blocking submerged means according to the residual oil distribution mode;
the plane residual oil distribution mode is divided according to the distribution position of residual oil on the plane of the dominant seepage channel, and comprises the residual oil at the tail end of the dominant seepage channel, the residual oil on the side wing of the dominant seepage channel and the residual oil in the dominant seepage channel;
for the residual oil at the tail end of the dominant seepage channel, adopting the measures of improving a well pattern and plugging a water outlet layer to maintain the formation energy, and meanwhile, selectively patching holes on an oil well positioned at the tail end of the dominant seepage channel and adopting a dredging and plugging combined method to carry out excavation and submergence; for the residual oil on the side wing of the dominant seepage channel, measures of transferring injection, recovering water injection, plugging and shutting down a high-water-content oil well are adopted, the stratum energy of the dominant seepage channel is increased, and the side wing is excavated and submerged by deploying a new well to perfect a well pattern, selectively filling holes in the oil well, fracturing a thin difference layer and acidizing; for the residual oil in the dominant seepage channel, adopting the measures of pumping thin well pattern, enlarging the injection-production well distance, reversing water injection and periodic water injection, and enlarging the water wave and volume of injection to carry out excavation and submergence;
The profile residual oil distribution mode is divided according to the distribution position of the residual oil in the longitudinal direction of the dominant seepage channel, and comprises the residual oil at the top of the dominant seepage channel, the residual oil in the middle of the dominant seepage channel and the residual oil at the bottom of the dominant seepage channel;
adopting a water well profile control, in-layer subdivision water injection, in-layer subdivision water plugging and rhythm section hole repairing method to excavate and submerge the residual oil on the top of the dominant seepage channel; for the residual oil in the middle of the dominant seepage channel, adopting a method of oil well extract, selective water plugging and periodic water injection of a water well to carry out excavation and submergence; and for the residual oil at the bottom of the dominant seepage channel, adopting a method of hole filling of an oil well rhythm section, profile control of a water well and subdivision water injection in the layer for excavation and submergence.
2. The method for mining the residual oil of the dominant seepage passage development reservoir according to claim 1, wherein the three-dimensional geological model for characterizing the dominant seepage passage is established by a random modeling method.
3. The method for mining the residual oil of the dominant seepage passage development reservoir according to claim 1, wherein the test data comprises data of a pressure drop test, a water absorption profile, a water absorption indication curve, a liquid production profile, residual oil monitoring and tracer monitoring; the logging information comprises data information of conventional logging and production logging; the well testing data comprises data of pressure drop well testing and interference well testing.
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