CN108915649B - Oil reservoir pressure plugging and flooding process mode optimization method - Google Patents
Oil reservoir pressure plugging and flooding process mode optimization method Download PDFInfo
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Abstract
The invention discloses an oil reservoir pressure blocking and flooding process mode optimization method, which determines a well group high flooding ineffective circulation part according to well group reservoir development, well pattern conditions, development current situation, residual oil distribution condition, flooding layer explanation and other data, provides 7 pressure blocking and flooding construction process modes, carries out condition judgment according to simple ineffective circulation parts and residual oil distribution condition, and quickly matches a target oil reservoir single well or well group with a reasonable pressure blocking and flooding construction process mode. The problem of current adoption carry out oil well pressure to block up or oil well pressure drives the process model of oil well to single well can not realize effectively digging latent complicated well group surplus oil is solved.
Description
Technical Field
The invention relates to the technical field of oil exploitation, in particular to a method for selecting a process mode of oil reservoir pressure plugging and flooding.
Background
At present, after chemical flooding development of some oil field main oil layers in China, the extraction degree is as high as more than 50%, the comprehensive water content is more than 95%, rock particles in reservoir pores are gradually dispersed and moved, high-permeability strong water washing strips which are dozens of or even hundreds of times larger than the original pore diameter are formed, and the longitudinal heterogeneity of the oil layers is more serious. In the subsequent water drive development process, strong water washing strips are formed at the bottom of an oil layer, so that the efficiency is low, ineffective circulation is serious, and residual oil at the top of a positive rhythm oil layer or a low water washing part at the middle upper part of a composite rhythm oil layer cannot be used for displacement.
At present, the existing oil field combines the distribution characteristics of residual oil after chemical flooding, provides a fracturing plugging technology, utilizes large-scale fracturing to make horizontal cracks, quickly pushes a medicament to a target area, and realizes a new idea of plugging ineffective circulation positions at the bottom of an oil layer and submerging the residual oil.
The existing fracturing plugging technology mainly adopts two construction process modes of single-well pressure plugging and single-well pressure flooding at an oil well end, and the two construction process modes are used for a period of time to find that certain problems exist, and are specifically as follows:
a. single well pressure plug
The principle is as follows: pressing open horizontal artificial cracks at the bottom preferential seepage passage part of the oil well end, as shown in figures 1A and 1B, injecting a plugging medicament by a pump, plugging the preferential seepage passage after the medicament is gelatinized, and injecting fluid to flow around the near oil well end to displace the residual oil at the low water-containing part at the upper part of an oil layer.
The problems are as follows: the method is limited by the maximum injection medicament scale of the fracturing string and the influence of the shape of the horizontal fracture, the penetration ratio of the fracturing artificial fracture at the oil well end is uncontrollable, if the artificial fracture is elliptical, the actual blocking radius R is slightly smaller, the injection fluid flow line is closer to the oil well end, and the range of the involved residual oil is smaller, so that the condition of the residual oil at the low-water-content part at the upper part of an oil layer cannot be effectively used.
b. Single well pressure drive
The principle is as follows: and pressing open the horizontal artificial cracks at the low water-containing part at the upper part of the oil well end, and injecting an oil displacement agent by a pump as shown in figures 2A and 2B, so that the oil is pumped out from the oil well end to play an oil displacement role, and residual oil is excavated and submerged.
The problems are as follows: the maximum injection medicament scale of the fracturing string is limited, and the longitudinal heterogeneity of the oil layer is influenced, the pressure-drive throughput radius of the low-water-content part at the upper part of the oil well end is small, and the injected fluid does not have a streaming flow at the oil well end, so that the residual oil at the low-water-content part at the upper part of the oil layer cannot be effectively displaced.
The two process modes have the problems that the construction of a single well is relatively simple, and the residual oil cannot be effectively displaced, so that the problem of ineffective circulation of large pore passages at the bottom of an oil-water interwell oil layer after polymer flooding is solved under the conditions of complex well group sand body development, communication and residual oil distribution, and the fracturing plugging or fracturing oil displacement process mode of the single well cannot adapt to complex reservoir conditions after polymer flooding, and the targeted refining, classification and optimization of the fracturing plugging and flooding process mode are urgently needed.
Disclosure of Invention
In view of the above, the invention provides an oil reservoir pressure blocking and flooding process mode optimization method, which is suitable for effective displacement of residual oil in a complex well group and solves the problem that residual oil in a complex well group cannot be effectively excavated and submerged by adopting a process mode for oil well pressure blocking or oil well pressure flooding aiming at a single well at present.
In order to achieve the purpose, the invention adopts the technical scheme that: a preferable method for a reservoir pressure plugging and flooding process mode is characterized by comprising the following steps:
determining flooding interpretation data of a well group, oil-water inter-well communication conditions of the well group and residual oil distribution conditions of the well group; and
selecting a pressure plugging and flooding process mode according to the flooding interpretation data of the well group, the oil-water inter-well communication condition of the well group and the distribution condition of the residual oil of the well group, wherein the process modes respectively comprise:
the oil well end and the water well end of the well group do not have a high water flooding section with the height of more than 0.5m, and the sand body connectivity between the oil well and the water well is not good, then:
if the residual oil is close to the oil well end, performing oil well pressure drive at the oil well end;
if the residual oil is close to the water well end, performing water well pressure drive at the water well end;
and if the oil well end has a water flooding section with the length of more than 0.5m, the following steps are performed:
if the sand body connectivity between the oil-water wells is good, the residual oil is close to the oil well end, and oil well pressure plugging is carried out at the oil well end;
if the sand body connectivity between the oil-water wells is not good, the residual oil exists in the middle of the oil-water well, namely performing water well pressure flooding at the water well end and performing oil well pressure plugging at the oil well end;
③ the well end has a high water flooded section above 0.5m, then:
if the sand body connectivity between the oil-water wells is good, the residual oil is close to the water well end, oil well pressure flooding is carried out at the oil well end, and water well pressure plugging is carried out at the water well end;
if the sand body connectivity between the oil-water wells is not good, the residual oil exists in the middle of the oil-water well, and well pressure plugging is performed at the well end;
and fourthly, high water flooded sections with the length of more than 0.5m exist at the oil well end and the water well end, the sand body connectivity between the oil wells is good, the residual oil exists at the upper part of an oil layer between the oil wells, and then oil well pressure plugging is carried out at the oil well end and water well pressure plugging is carried out at the water well end.
Preferably, in the first process mode, the oil well pressure flooding is to perform fracturing and crack formation at a low-permeability part at the upper part of a reservoir, inject an oil displacement agent for oil displacement, and deliver the residual oil from the oil well end; the water well pressure flooding is characterized in that a high-permeability section at the upper part of a reservoir is fractured to form a seam, the oil-displacing agent is injected for displacing oil, fluid is subsequently injected, the fluid displaces a slug of the oil-displacing agent, and residual oil is excavated and submerged.
Preferably, in the second process mode, the oil well pressure plugging is to perform fracture formation at a high permeability section at the lower part of a reservoir, inject plugging agent for plugging, and subsequently inject the fluid to bypass at the end of the oil well to excavate residual oil;
the well pressure flooding is carried out at the well end, and the well pressure plugging is carried out at the well end, then:
the water well pressure flooding is to perform fracturing and crack formation on a lower high-permeability section and inject the plugging agent for plugging;
and the oil well pressure blocking is to perform fracturing and crack building on a low-permeability section at the upper part of a reservoir, inject the oil displacement agent and the fluid, and the oil displacement agent promotes the fluid to enter a middle-low permeability layer to submerge the residual oil.
Preferably, in the third process mode, if both the oil well pressure flooding is performed at the oil well end and the water well pressure plugging is performed at the water well end, then:
the oil well pressure flooding is to perform fracturing and crack formation on a low-permeability section at the upper part of a reservoir layer and inject the oil displacement agent and the fluid;
the water well pressure plugging is to perform fracturing and crack formation on a high-permeability section at the lower part of a reservoir, inject the plugging agent for plugging, and promote the fluid to enter a middle-low permeable layer by the oil displacement agent to excavate residual oil;
the water well pressure plugging is carried out at the water well end, namely, a high-permeability section at the lower part of a reservoir is fractured to form a seam, the plugging agent is injected to carry out plugging, and the fluid is subsequently injected to flow around the water well end to displace the residual oil position.
Preferably, in the process mode, oil well pressure blocking is performed at the oil well end, water well pressure blocking is performed at the water well end, the high-permeability section at the lower part of an oil layer is correspondingly fractured to form a seam, the blocking agent is injected to block, and the fluid is subsequently injected to enter the medium-low permeability layer to drive and excavate the residual oil.
Preferably, the residual oil is close to the well end, which means that the residual oil is located in 1/3 well intervals of the well end; the residual oil is close to the water well end, and means that the residual oil is located in 1/3 well spacing of the water well end.
The invention has the following beneficial effects: the optimization method of the oil layer pressure plugging and flooding process mode provides 7 pressure plugging and flooding construction process modes which can be implemented on site, avoids the inadaptability of a single oil well end fracturing plugging or fracturing oil flooding process to a complex development condition, can quickly optimize the appropriate pressure plugging and flooding process by performing condition judgment through simple ineffective circulation of a well group and the distribution condition of residual oil, and is convenient and quick to place in a matched manner.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
FIG. 1A is a schematic diagram of a single-well plugging process at the well end in the background art;
FIG. 1B is a prior art single well plug at the well end;
FIG. 2A is a schematic diagram of a single-well pressure flooding process at the end of an oil well in the background art;
FIG. 2B is a prior art single well pressure drive at the well end;
FIG. 3 is a flow chart of a preferred method of a pressure plugging and flooding process mode according to an embodiment of the invention;
FIG. 4 is a schematic representation of an oil well pressure flood in accordance with an embodiment of the present invention;
FIG. 5 is a schematic illustration of a water well pressure flood in accordance with an embodiment of the present invention;
FIG. 6 is a schematic illustration of a triple well plug according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of four oil well pressure plugging and water well pressure flooding in accordance with an embodiment of the present invention;
FIG. 8 is a schematic diagram of a pressure plugging and flooding scheme for a water well and an oil well according to an embodiment of the invention;
FIG. 9 is a schematic illustration of a six well plug according to an embodiment of the present invention;
FIG. 10 is a schematic view of the corresponding plugging of a seven oil-water well according to an embodiment of the present invention.
Detailed Description
The present invention will be described below based on examples, but it should be noted that the present invention is not limited to these examples. In the following detailed description of the present invention, certain specific details are set forth. However, the present invention may be fully understood by those skilled in the art for those parts not described in detail.
It is to be stated that, according to the connected state, the connection is divided into one type, two types and three types: the method is characterized in that the method respectively corresponds to three levels of reservoir conditions of oil field division, namely a first-class reservoir, a second-class reservoir and a third-class reservoir. Good connectivity means that an oil-water well displacement relationship can be established, a water well can supply water to the direction of an oil well, and poor connectivity means that no water is supplied to the direction of the oil well by the water well, and the residual oil in the direction cannot be displaced correspondingly.
FIG. 3 is a flow chart of a preferred method of a pressure plugging and flooding process mode according to an embodiment of the invention; as shown in fig. 3: a preferable method for oil reservoir pressure plugging and flooding process mode comprises the following steps:
(1) oil-pressure-laminated plugging and flooding well group data preparation
And researching the well condition, the well pattern condition, the production dynamic, the test data, the distribution condition of the residual oil and the like of the target well, obtaining the communication condition between oil and water wells of the well group, the interpretation data of oil layer flooding and the distribution condition of the residual oil, and preferably preparing data for a pressure plugging and flooding process mode.
(2) The pressure plugging and flooding process mode is optimized:
according to the problems existing in the prior construction process mode of pressure plugging at the oil well end or pressure flooding at the oil well end, from the overall view of a well group, the conditions of communication between oil and water wells of the well group, reservoir flooding interpretation data, invalid circulation state of injected water, residual oil distribution and the like are considered, in order to achieve the purposes of changing the flow line of the injected water and using residual oil at a low-water-content part in an oil layer, 7 pressure plugging and flooding process modes are provided, condition judgment is carried out through invalid circulation, residual oil and distribution state of the well group, and a construction process mode suitable for a target oil layer is preferably selected:
scheme one, shown by figure 4: the residual oil is close to the oil well end, a low-permeability part at the upper part of a reservoir at the oil well end is fractured to form a seam, an oil displacement agent is injected for oil displacement, the oil displacement effect is played by the huff and puff of the oil well end, and the residual oil is excavated and submerged;
scheme two, shown by figure 5: and residual oil is close to the water well end, a high-permeability section at the upper part of a reservoir at the water well end is fractured to form a seam, an oil-displacing agent is injected for displacing oil, fluid is injected conventionally subsequently, an oil-displacing agent slug is displaced, and the residual oil is excavated and submerged.
scheme three, shown by figure 6: residual oil is close to the oil well end, a high-permeability section at the lower part of a reservoir at the oil well end is fractured and fractured, plugging agent is injected for plugging, and then fluid is injected to bypass at the oil well end to excavate the residual oil;
scheme four, shown by figure 7: and residual oil is in the middle of the oil-water well, a high-permeability section at the lower part of the well end is fractured to form a seam, plugging agent is injected to perform plugging, and meanwhile, an oil displacement agent is injected to displace oil at a low-permeability section at the upper part of a reservoir at the oil well end. And the fluid is promoted to enter the medium and low permeable layer, the oil displacement effect of the well group is improved, and the residual oil is excavated and submerged.
scheme five, shown by figure 8: and residual oil is in the middle of the oil-water well, a low-permeability section at the upper part of a reservoir at the end of the oil well is fractured to form a seam, an oil displacement agent is injected for oil displacement, and meanwhile, a high-permeability section at the lower part of the reservoir at the end of the water well is fractured to form a seam, a plugging agent is injected for plugging, so that fluid is forced to enter a medium-low permeability layer, the oil displacement effect of a well group is improved.
Scheme six, shown by figure 9: residual oil is close to the water well end, a high-permeability section at the lower part of a reservoir at the water well end is fractured to form a seam, a plugging agent is injected to perform plugging, and subsequently fluid is injected to flow around the water well end to displace the residual oil;
scheme seven, shown by figure 10: and correspondingly fracturing and crack-making high-permeability sections at the lower parts of oil layers at two ends of the oil-water well, injecting a plugging agent for plugging, and allowing subsequent fluid to enter the medium-low permeability layer for driving, washing and excavating residual oil.
The preferred process of the present application is further illustrated by the following specific examples:
example 1
The experimental wells were Chongqing Changyuan type reservoirs B1-6-P68 wells.
The B1-6-P68 well is an old well which is a polymer flooding post-production well and has the completion time of 1996, 10 months and 10 days. The well oil-water well distance is 175m, the well depth is 1166.71m, the depth of a perforated well section is 1068.9-1097.7 m, and the total number of perforated PI 1-PI 7 is 8 small layers, wherein the number of the small layers comprises PI2 small layers.
(1) Destination well group data preparation
The target well group is arranged at the edge of the experimental area of the horizontal well group, 1 oil well is arranged in the middle, and 6 injection wells are additionally arranged on the periphery of the target well group. The well mining target layer belongs to a river-delta sedimentary system, the PI2 unit belongs to the flooding flat original phase high-bending large-scale composite meandering river sedimentary, and the reservoir point dam sand body develops.
As can be seen from the fine description of sand body development of well group reservoirs, the B1-6-P68 well PI2 unit and the 6 injection wells are communicated with river channel sand, and the control degree of the river channel sand is 100%.
The polymer flooding well is put into operation in 1997 in 8 months, the water content reaches 92.48% after 4 months, the well is shifted to subsequent water flooding in 2003 in 3 months, the well is shut in with high water content at the end of 2008, the well is opened and produced in a horizontal well group development test in 2013 years, the daily produced liquid is 181t, the daily produced oil is 0.1t, and the water content is 99.9%.
The well mainly exploits grape blossom reservoirs, PI 1-PI 7 small layersThe well point permeability is 0.44-1.17 mu m2The development thickness of the oil layer of the main reservoir PI2 group is large, and the maximum permeability is 1.17 mu m2Dominant percolation channels develop. From the plot of the interpretation result of the small-layer water flooding, the PI2b has better small-layer pore permeation conditions and high water flooding, and is a main liquid production layer (best before construction, annular testing is carried out, and the main liquid production layer is implemented by combining the latest data).
The existing data are consistent and confirmed, the PI2b layer is a high water flooded part in an oil layer, and the PI2 layer of the well group is communicated with river sand, so that invalid circulation among oil-water wells of the well group is determined.
According to reservoir residual oil numerical simulation research, the PI2 layer after polymer flooding is relatively enriched in top residual oil, is mainly distributed at a position close to an oil well end 1/3, is 44.6% in oil saturation, is less in bottom residual oil and is 26.3% in oil saturation, the well controls 3.6 ten thousand tons of residual recoverable reserves of the reservoir, the recovery degree is expected to be improved by 8%, and 2880 tons of crude oil can be recovered.
(2) Optimization of pressure plugging and flooding process mode
Through the data analysis, it can be confirmed that 1 oil well 6 water wells are arranged in a well group, a construction target layer is that PI2 group oil layers are communicated with river sand bodies, a large pore passage is formed after polymer flooding, invalid circulation among oil wells is serious, daily produced liquid 181t and daily produced oil 0.1t exist at a position close to a well distance of 1/3 at present, water control and oil increase measures need to be carried out, and the preferable thinking of a construction process mode is as follows: the well group has an ineffective circulation → the ineffective circulation exists at the oil well end → the remaining oil is distributed close to the oil well → the oil well end is pressed and blocked.
After the optimization is carried out by the method, the optimization result of the third scheme can be executed, the oil well fracturing and plugging process is carried out on the PI2 oil layer group of the B1-6-P68 well, the invalid circulation of the injected water at the bottom of the oil layer of the PI2 group at the end of the oil well is plugged, the injected water generates the streaming flow in the oil layer near the end of the oil well, the residual oil at the low water-containing part at the upper part of the oil layer is communicated, and the production degree of the oil.
The construction time of the well is 11 and 24 days in 2017, the daily liquid production is 162.05t before pressing, the daily oil production is 0.16t, the water content is 99.9%, the monthly average liquid production after measures is continuously reduced, the monthly average liquid production is 146.46t, the daily oil production is 2.11t, and the water content is 98.56%, and the fracturing plugging process measures reduce the ineffective circulation of the produced liquid at the oil well end and achieve a good oil increasing effect.
Example 2
The experimental wells were Chongqing Changyuan type oil reservoirs L9-PS2133 wells.
The L9-PS2133 well is an old well of a recovery well after polymer flooding, and the drilling completion time is 2008, 01 month and 4 days. The well oil-water well distance is 150m, the well depth is 1141.10m, the depth of a perforation well section is 1014.8-1035.2 m, 5 small layers are formed in total by shooting SIII 3-10, and the small layers comprise SIII3-7 small layers.
(1) Destination well group data preparation
The target well group is positioned in an L9-PS2133 well and is positioned in a first northeast block of a catamount oilfield, the area of the block is 7.1 km2, 3-10 layers of mining salami are mined, SIII3-7 layers are river sand bodies which are grown in a connected mode, the hole seepage condition is good, and the reservoir belongs to a class of reservoirs.
As can be seen from the fine description of sand development of well group reservoirs, the L9-PS2133 well SIII3-7 unit and 4 surrounding injection wells are communicated with river sand in the same type, and the control degree of the river sand is 100%. After the SaIII 3 unit subdivides the structural units, the upper sand body is changed from one type of communication to two types of communication in the injection and production direction of the 9-PS2134 well.
The well is put into production in 2008 in 9 months, the daily liquid production is 52t at the initial stage of the production, the daily oil production is 1t, and the water content is 98.8%. 13000t of the current accumulated oil production, 53.3 percent of stage production degree, 92t of current daily oil production, 2.2t of daily oil production and 97.6 percent of water.
The well is provided with 4 communicated injection wells, the injection conditions are stable, and the average daily injection is 305m3And 2 months for controlling ineffective injection, the daily injection amount is adjusted down to 235 m3。
As can be known from the detailed description of the reservoir, the oil layers of the well groups Sa 3-7 are all one-class oil layers with good connectivity, after the SulIII 3 unit subdivides the structural units, the upper sand body is changed from one-class communication to two-class communication in the injection and production direction of the 9-PS2134 well, and the parts with high water content are mainly concentrated at the bottom of the layer section.
By studying the water absorption profile data of the L9-PS2133 well group, it can be seen that when the block is in the polymer injection oil recovery stage, the water absorption conditions of the 4-port polymer injection wells of the well group are counted (as shown in Table 2), the water absorption ratio of the lower part of the ISII 3-7 oil layer is 55.5%, 41.5% and 25.0% higher than the upper part and the middle part respectively, and the water absorption ratio is the main water absorption part. In 2017, the block enters a subsequent water flooding stage, SIII3-7Lower partThe ineffective circulation of the oil layer is serious, and for achieving the purpose of stabilizing oil and controlling water, the aim of S III3-7 of well groupsLower partThe oil layer was subjected to controlled flooding. Since the well end SIII3-7On the upper partThe water absorption capacity of an oil layer group is small, the capacity of injected water waves and residual oil is poor, and well group pressure plugging and flooding measures and technologies need to consider well end synchronization measures.
TABLE 2L 9-PS2133 well group Water absorption Profile data
And a liquid production profile test is carried out on an L9-PS2133 well by an oil production plant in 2018, 4 and 11, and an interpretation result of the four-parameter combination logging data of the production profile is obtained.
L9-PS2133 well SIII3-7Lower partThe depth of each layer section is 1021.6-1028 m, and the liquid production data show SIII3-7Lower partInterval liquid production capacity 17.4m3The/d, which accounts for only 22.2% of the total well fluid volume, is not the major fluid production zone, indicating that SIII3-7 was in the last two yearsLower partThe oil layer has obvious effect of controlling water injection. Currently SIII3-7On the upper partAnd SIII9+10 fluid production rose to 54.3% and 23.5% of the total well fluid volume, respectively, considering SIII3-7On the upper partOil layer was transformed by fracturing in 2013 and affected by waterflooding, SIII3-7On the upper partThe reservoir had formed a partial dominant permeability and the interpretation data was compiled (see table 3).
TABLE 3L 9-PS2133 well production Profile four parameter combination log data interpretation
Comprehensively analyzing the identification of the dominant channel part of the thick oil layer, the production fluid and water absorption data of the well group, and considering that SIII3-7 exists at the current oil well endOn the upper partAnd SIII3-7Lower partTwo dominant percolation paths.
Consider that SIII3-7 is currently availableLower partThe stratum reduces the fluid production strength of the stratum through well group water injection regulation and control, and the current fracturing plugging SIII3-7 is determined through researchOn the upper partThe layer is a preferential seepage channel, and the layer depth is 1014.8-1018.0 m.
From the numerical simulation result of the residual oil of the reservoir, the oil saturation degree of the SIII4+5 unit of the L9-PS2133 well is higher, about 40%, than that of other units, the residual oil is enriched, and the comprehensive analysis shows that a certain amount of residual oil exists in the SIII3-7 thick oil layer of the well.
The carbon-oxygen ratio test result before pressing shows that: the oil saturation degree is relatively high at the depth of 1018.0-1020.0mm, the oil saturation degree is shown as medium water flooding, and the residual oil is relatively enriched.
TABLE 4L 9-PS2133 well carbon to oxygen ratio test results
(2) Optimization of pressure plugging and flooding process mode
The data analysis can confirm that 1 oil well and 4 water wells exist in the well group, and the construction target layer is SIII3-7On the upper partThe oil layer is communicated with river sand bodies, a subsequent water flooding adjustment well group water injection scheme forms a dominant seepage channel, an invalid circulation exists at the oil well end, and the numerical simulation analysis is performed on the residual oil existing in the middle of the oil-water well to the oil well end. At present, the daily produced fluid of the well is 92.0t, the daily produced oil is 2.2t, the water content is 97.6 percent, water control and oil increasing measures are required, and the preferable thinking of the construction process mode is as follows: the well has an ineffective circulation → an ineffective circulation at the end of the oil well → the residual oil is distributed in the middle of the oil-water well → the oil well pressure plugging and the water well pressure driving combined process mode exists.
After the optimization is carried out by the method, the optimization result of the fourth scheme can be executed, the oil well fracturing and plugging is carried out on the oil layers of the groups of L9-PS2133 wells SIII3-7, the fracturing and oil displacement measures are synchronously carried out on the wells of L9-PS2134, and the oil well ends SIII3-7 are pluggedOn the upper partThe produced water at the bottom of the oil layer of the oil group is in ineffective circulation, so that the injected water generates streaming in the oil layer at the middle section of the oil-water well, and communicates the residual oil at the low water-containing part at the upper part of the oil layer, thereby improving the production degree of the oil layer.
The construction time of the well group is 2018, 4 months and 20 days, the current daily liquid production is 92t before pressing, the daily oil production is 2.2t, and the water content is 97.6%. After the L9-PS2133 well measures, the pressure of the well head is reduced from 9.5MPa to 1.7MPa, the pump is put into the well, the well group water well L9-PS2134 is put into a separate layer water injection pipe column, and SIII3-7On the upper partThe liquid absorption of the oil layer is obvious, and the effect of the well pressure blocking and flooding measures is to be further evaluated.
The above-mentioned embodiments are merely embodiments for expressing the invention, and the description is specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, various changes, substitutions of equivalents, improvements and the like can be made without departing from the spirit of the invention, and these are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (6)
1. A preferable method for a reservoir pressure plugging and flooding process mode is characterized by comprising the following steps:
determining water logging interpretation data, sand body communication conditions between oil-water wells and residual oil distribution conditions of the well groups; selecting a pressure plugging and flooding process mode according to the water flooding interpretation data of the well group, the sand body communication condition between the oil-water wells and the distribution condition of the residual oil; the process modes are respectively as follows:
(1) the oil well end and the water well end of the well group do not have a high water flooded section more than 0.5m, the connectivity of the sand body between the oil well and the water well is not good, and if:
if the residual oil is close to the oil well end, performing oil well pressure drive at the oil well end;
if the residual oil is close to the water well end, performing water well pressure flooding at the water well end;
(2) the oil well end has a water flooded section of more than 0.5m, if:
the sand body connectivity between the oil-water wells is good, and the residual oil is close to the oil well end, so that oil well pressure plugging is carried out at the oil well end;
if the sand body connectivity between the oil well and the water well is poor, and the residual oil exists in the middle of the oil well end and the water well end, performing water well pressure plugging at the water well end and performing oil well pressure flooding at the oil well end;
(3) the water well end has a high water flooded section of more than 0.5m, if:
the sand body between the oil and water wells has good connectivity, and the residual oil is close to the water well end, so that the water well pressure plugging is carried out at the water well end;
if the sand body connectivity between the oil-water wells is poor, and the residual oil exists between the oil well end and the water well end, performing oil well pressure flooding at the oil well end and performing water well pressure plugging at the water well end;
(4) and the oil well end and the water well end both have high water flooded sections of more than 0.5m, the sand body connectivity between the oil and the water wells is good, and the residual oil exists at the upper part of an oil layer between the oil well end and the water well end, so that the oil well pressure plugging is carried out at the oil well end and the water well pressure plugging is carried out at the water well end.
2. The preferable method for oil reservoir pressure plug-drive process mode according to claim 1 is characterized in that:
the residual oil is close to the oil well end, namely the residual oil is located in 1/3 well spacing of the oil well end; the residual oil is close to the water well end, and means that the residual oil is located in 1/3 well spacing of the water well end.
3. The preferable method for oil reservoir pressure plug-drive process mode according to claim 1 is characterized in that:
in the process mode (1), the oil well pressure flooding is to fracture and crack at a low-permeability part at the upper part of a reservoir at the oil well end, inject an oil displacement agent for oil displacement, and throughput the residual oil from the oil well end; the water well pressure flooding is characterized in that a high-permeability section at the upper part of a reservoir at the water well end is fractured to form a seam, the oil displacement agent is injected for displacement of oil, fluid is subsequently injected, the fluid displaces a slug of the oil displacement agent, and residual oil is excavated and submerged.
4. The preferable method for oil reservoir pressure plug-drive process mode according to claim 3, characterized in that:
in the process mode (2), the oil well pressure plugging is to perform fracturing and crack formation on a high-permeability section at the lower part of a reservoir at the oil well end, inject plugging agent for plugging, and subsequently inject the fluid to bypass at the oil well end to excavate residual oil;
both carry out well pressure stifled at the well end, and carry out oil well pressure at the oil well end and drive, then:
the water well pressure plugging is to perform fracturing and crack formation on a high-permeability section at the lower part of the water well end, and inject the plugging agent for plugging;
and the oil well pressure flooding is to perform fracturing and crack formation on the low-permeability section at the upper part of the reservoir at the oil well end, inject the oil displacement agent and the fluid, and the oil displacement agent promotes the fluid to enter the middle-low permeability layer to submerge the residual oil.
5. The preferable method for oil reservoir pressure plug-drive process mode according to claim 4, characterized in that:
in the process mode (3), performing oil well pressure flooding at the oil well end and performing water well pressure plugging at the water well end, then:
the oil well pressure flooding is characterized in that a low-permeability section at the upper part of a reservoir at the oil well end is fractured to form a seam, and an oil displacement agent is injected to displace oil;
the water well pressure blocking is to perform fracturing and crack formation on a high-permeability section at the lower part of a reservoir at the water well end, inject the blocking agent for blocking, and promote the fluid to enter a medium-low permeability layer to excavate residual oil.
6. The preferable method for oil reservoir pressure plug-drive process mode according to claim 4, characterized in that:
in the process mode (4), oil well pressure plugging is carried out at the oil well end, water well pressure plugging is carried out at the water well end, the plugging agent is injected to plug a high-permeability section at the lower part of an oil layer at two ends of the oil well corresponding to fracturing and crack forming, and the fluid is subsequently injected to enter the middle-low permeable layer to drive and excavate the residual oil.
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| CN111322052A (en) * | 2019-12-12 | 2020-06-23 | 大庆油田有限责任公司 | Method for injecting oil displacement agent and plugging agent into thick oil layer by fracturing to drive and wash low-water-content part and plug strong-water-washing strip |
| CN114427374A (en) * | 2020-09-21 | 2022-05-03 | 中国石油化工股份有限公司 | Well group cooperative water control method for solution reservoir |
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