CN112664168A - Method for adjusting injection and production system of oil field encrypted well - Google Patents
Method for adjusting injection and production system of oil field encrypted well Download PDFInfo
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Abstract
The invention provides an adjusting method of an oil field encryption well injection and production system, which aims to solve the problems that the existing injection and production well cannot meet the production requirement at the later exploitation stage of the injection and production well with fault development and poor absorption capacity of a water injection well. The method comprises the following steps: according to the three-dimensional seismic structure interpretation result, the newly added well area with imperfect injection-production relation is used for implementing oil well transfer injection; meanwhile, on the basis of the current well arrangement mode of encryption adjustment, a slow injection well is injected, and finally a four-point method area well pattern and a linear water injection mode are formed through adjustment; further improving the injection-production relation of the well region; preferentially transferring inefficient and ineffective wells; hole patching and pressure relief; by applying a fine geological research result, the perforation corresponding rate of the oil-water well of the transfer injection well region is improved through hole patching, and the single sand injection-production relation of the encryption adjustment well is further perfected. The method is suitable for adjusting the injection and production wells with complex geological conditions and reduced injection and production capacity.
Description
Technical Field
The invention relates to an adjusting method of an oil field encrypted well injection and production system.
Background
For an oil well with extremely complex fault development, the injection and production adaptability of the well area is obviously poor through years of water injection development, and the development effect of the block is influenced. Taking the west of the south two areas of a certain oil field as an example, the method is specifically shown in the following aspects:
1) the development of the fault is very complex, and the development effect is influenced
The number of small faults in the western block of the south two area of a certain oil field is increased, the fault extension length is increased, the trend of a large fault is basically consistent with that of the original fault, 108 new faults are identified by the SaII group, and 32 new faults can be determined after the new faults are combined with well data to form a plurality of closed and semi-closed fault blocks.
2) High ratio of oil-water well and poor water absorption capacity of water injection well
Two sets of well patterns are adopted in the west once-encryption adjusting well in the south second area, a new four-point method area well pattern is formed by the offset adjusting wells, the linear water injection mode is formed by the offset adjusting wells, and the oil-water well ratio is 2.54: 1. the secondary encryption adjustment well forms a linear water injection mode with the well spacing of 250 meters and the row spacing of 125 meters, and the oil-water well ratio is 1.54: 1.
the contradiction of water absorption difference of the water injection well is more prominent by the limitation of water absorption capacity of the thin difference oil layer and the encryption adjustment. The statistical encryption adjustment well has 48 holes which are not matched with injection wells when the water absorption capacity is poor, the water absorption capacity accounts for 26.09 percent of the total number of the encryption water injection wells, the average single well water injection pressure is 10.52MPa, the oil pressure difference is 0.41MPa, the average single well is matched and injected for 103m3 every day, the daily injection is 64m3, and the well which is subjected to fracturing and acidizing measures is 98 wells. Under the condition of the existing injection-production well pattern, the potential of further enhancing water injection and improving the liquid production capacity of the block is small by adjusting the pressure.
3) The injection-production relationship of partial well areas is not coordinated, and the multidirectional water drive control degree is low
The statistical encryption adjustment well injection and production imperfect well area has sandstone water drive control degree of 87.67% and effective water drive control degree of 83.55%, wherein the control degrees of the one-way sandstone and the effective water drive are 41.05 and 39.91% respectively, the control degrees of the two-way sandstone and the effective water drive are 25.97 and 24.08% respectively, and the control degrees of the three-way sandstone and the above sandstone and the effective water drive are 20.65 and 19.56% respectively.
4) The formation pressure level is low and the pressure system is unreasonable
And counting pressure data of the oil extraction well with 39 ports, wherein the current formation pressure is 7.80MPa, the average flowing pressure is 2.60MPa, and the total pressure difference is-1.83 MPa. Wherein the formation pressure of the primary encrypted well is 7.91MPa, the average flowing pressure is 2.61MPa, and the total pressure difference is-1.62 MPa (the formation pressure of the Sadiff layer is 7.88MPa, and the total pressure difference is-1.66 MPa); the formation pressure of the secondary encrypted well is 7.73MPa, the average flowing pressure is 2.60MPa, and the total pressure difference is-1.96 MPa.
Counting 274 encrypted adjustment well liquid level data, wherein the average single well sinking degree is 231.1m, the average sinking degree of 153 ports of the primary encryption well is 243.4m, the average sinking degree of 121 ports of the secondary encryption well is 215.6 m; the number of the liquid supply deficient wells is large, 89 liquid supply deficient wells with the sinking degree lower than 100m account for 32.48% of the number of the statistical wells, and the average sinking degree is only 50.0 m. 43 primary encryption wells account for 28.1 percent of the number of the primary encryption statistical wells, and the average sinking degree is 46.5 m; the number of the secondary encryption wells is 46, which accounts for 38.1% of the number of the secondary encryption statistical wells, and the average sinking degree is 53.3 m.
5) The yield decrement amplitude is larger
Due to the influence of faults, the multidirectional water drive control degree of a well region of the encryption adjusting well is low, and the difficulty in controlling the yield decreasing speed is increased.
The results show that on the basis of the three-dimensional seismic technical explanation result, the multidirectional water drive control degree of partial well zones of the western encryption adjusting well in the southern two areas is low, the number ratio of oil-water wells is high, the formation pressure is low, the oil pressure-allowable difference is small, the yield decreasing speed is high, and the injection-production adaptability of the well pattern is poor, so that the injection-production system adjustment is needed.
Disclosure of Invention
The invention aims to provide an adjusting method of an oil field encryption well injection and production system, which is suitable for the exploitation of an oil field with poor injection and production performance of an oil field well pattern.
An oil field encrypted well injection and production system adjusting method comprises the following steps:
1) according to the three-dimensional seismic structure interpretation result, the newly added well area with imperfect injection-production relation is used for implementing oil well transfer injection; meanwhile, on the basis of the current well arrangement mode of encryption adjustment, a slow injection well is injected, and finally a four-point method area well pattern and a linear water injection mode are formed through adjustment;
2) the broken block closed area further improves the injection-production relation of the well area by adopting comprehensive excavation and potential methods such as well pattern recombination, well type adjustment, perforation layer optimization and the like;
3) preferentially transferring the ineffective and ineffective wells, controlling the yield influenced by the transfer to be a lower level, and suspending the transfer for the slow injection well with the oil production of more than 5t at present;
4) patching holes for pressure relief aiming at the combination measure of the well points with higher pressure and the layer positions;
5) the injection-production well spacing of the transfer well of the encryption adjusting well and the production wells of each well network in the block is kept above 100 m;
6) after the injection and production system is adjusted, a fine geological research result is applied, the perforation corresponding rate of the oil-water well of the transfer injection well zone is improved through hole patching, and the single sand injection and production relation of the encryption adjustment well is further perfected:
7) the injection of the shot hole well is not changed within 50m from the large fault on the plane of the oil production well at the edge of the fault, and the injection of the shot hole well is not changed within 10m from the break point when the break point is located at the oil layer part in the longitudinal direction;
8) the original water injection well area further improves the single sand injection and production relation by compensating part of the thickness.
The invention achieves the following beneficial effects:
by adopting the invention, the control degree of the injection and production system for adjusting the multi-directional water drive of the well drive is obviously improved, the oil output of the old well is increased, and the service life of the old well is prolonged.
Detailed Description
An adjusting method of an encryption well injection-production system in western mining areas of south two areas of an oil field comprises the following steps: 1) according to the three-dimensional seismic structure interpretation result, the newly added well area with imperfect injection-production relation is used for implementing oil well transfer injection; meanwhile, on the basis of the current well arrangement mode of encryption adjustment, a slow injection well is injected, and finally a four-point method area well pattern and a linear water injection mode are formed through adjustment;
2) the broken block closed area further improves the injection-production relation of the well area by adopting comprehensive excavation and potential methods such as well pattern recombination, well type adjustment, perforation layer optimization and the like;
3) preferentially transferring the ineffective and ineffective wells, controlling the yield influenced by the transfer to be a lower level, and suspending the transfer for the slow injection well with the oil production of more than 5t at present;
4) patching holes for pressure relief aiming at the combination measure of the well points with higher pressure and the layer positions;
5) the injection-production well spacing of the transfer well of the encryption adjusting well and the production wells of each well network in the block is kept above 100 m;
6) after the injection and production system is adjusted, a fine geological research result is applied, the perforation corresponding rate of the oil-water well of the transfer injection well zone is improved through hole patching, and the single sand injection and production relation of the encryption adjustment well is further perfected:
7) the injection of the shot hole well is not changed within 50m from the large fault on the plane of the oil production well at the edge of the fault, and the injection of the shot hole well is not changed within 10m from the break point when the break point is located at the oil layer part in the longitudinal direction;
8) the original water injection well area further improves the single sand injection and production relation by compensating part of the thickness.
The specific operation is as follows:
(1) transfer notes
According to the method, 16 wells are co-injected, and the well numbers are as follows: south 1-40-434, south 1-4-229, south 1-4-propyl 029, south 1-butyl 6-222, south 1-6-230, south 1-butyl 5-218, south 2-1-propyl 026, south 2-2-224, south 2-2-232, south 2-30-429, south 2-3-230, south 2-butyl 1-220, south 2-butyl 1-228 (requiring the well to be subjected to major repair, if the well cannot be repaired, the lateralization is stopped), south 2-butyl 1-B125, south 2-butyl 2-propyl 130, and south 2-butyl 2-water 133.
The average single-well jet-opening sandstone thickness of the transfer well is 13.1m, the effective thickness is 4.5m, 13 wells are opened at present, the daily produced fluid is 271t, the daily produced oil is 25.7t, the comprehensive water content is 90.51%, the average single-well submergence is 247.91m, and the average single-well cumulative oil production is 4.05 multiplied by 104 t; 3 wells which are shut in at present, 27t of daily production fluid before shut in, 3.0t of daily oil production, 89.89% of comprehensive water content and 2.47 multiplied by 104t of average single well accumulated oil production. After the transfer, the ratio of oil to water in the well is adjusted by encryption from 2.00: 1 adjusted to 1.76: 1, wherein once encrypt well oil water well ratio of adjusting by 2.54: 1 was adjusted to 2.04: 1.
aiming at a three-dimensional seismic interpretation result, a plurality of closed and semi-closed fault blocks are formed, 11 times of oil production well re-injection are implemented, the average single-well ejection sandstone thickness of the re-injection well is 14.1m, the effective thickness is 4.7m, the daily liquid yield is 258t, the daily oil yield is 24.5t, the comprehensive water content is 90.49%, the average single-well sinking degree is 276.83m, and the average single-well cumulative oil yield is 3.79 multiplied by 104 t.
In addition, according to the well pattern arrangement relation of the production bed series, partial slow injection wells with lower daily oil production level are converted into water injection wells, 5 ports of the slow injection wells are totally converted, the average single well injection sandstone thickness of the slow injection wells is 10.8m, the effective thickness is 3.9m, the daily oil production is 40.1t, the daily oil production is 4.0t, the comprehensive water content is 89.53%, the average single well sinking degree is 179.93m, and the average single well cumulative oil production is 3.67 multiplied by 104 t.
(2) The oil and water well of the well region is re-injected with 34 openings, so that the single sand injection-production relation is further improved
In order to perfect the single sand injection-production relationship, the potential of residual oil is further excavated, and the sand distribution form and the communication relationship are cleared on the basis of fine geological anatomy. Determining a hole repairing layer position of an oil-water well; on the plane, the hole patching object of the transfer injection well is mainly an un-perforated oil layer communicated with the shooting position of the well zone encryption adjustment oil production well, the single sand body injection and production relation is further perfected, and meanwhile, in order to prevent ineffective water injection, the hole patching object is not implemented on the position communicated with the high water-bearing layer. In the longitudinal direction, in order to prevent the interlayer channeling, the distance between the interlayer and the high water-bearing layer is required to be more than 2.0 m. The hole filling of the oil production well mainly aims at excavating residual oil formed by incomplete injection and production and improving the daily production level of a single well.
And determining that 5 wells in the transfer wells in the closed and semi-closed fault block areas need hole patching and then transfer injection, and simultaneously filling 6 wells in the transfer wells (see table 1) by combining three-dimensional seismic interpretation results and adopting a comprehensive analysis method. At present, the average single-well injection sandstone thickness of 11 wells (the single-well hole filling is based on the actual hole filling scheme) is 16.9m, the effective thickness is 5.5m, and the average single-well injection sandstone thickness is estimated to be 13.3m and the effective thickness is 5.5 m.
TABLE 1 statistical table of hole-filling situation of encrypted water injection well in the west of certain oil field in the south and the second areas
The oil production well of the transfer well region needs to be subjected to hole patching for 23 holes, the current average single-well injection sandstone thickness of 23 holes (the single-well hole patching is based on the actual hole patching scheme) is 16.3m, the effective thickness is 5.6m, the average single-well injection sandstone thickness is predicted to be 9.3m, and the effective thickness is 4.9 m. Aiming at 18 holes of a producing well in the closed and semi-closed fault block areas, the average single-well shot sandstone thickness is 17.6m, the effective thickness is 5.9m, and the average single-well shot sandstone thickness is predicted to be 9.0m and the effective thickness is predicted to be 5.0 m.
After the injection and production system of the encryption adjusting well in the west of the south second area is adjusted, the oil-water well ratio of the encryption adjusting well is 2.00: 1 adjusted to 1.76: 1, the multidirectional water drive control degree is improved. After the 16 wells are transferred, the sandstone of the well and the effective water drive control degree of the well are adjusted in an encrypted mode and are respectively improved by 1.34 percent and 1.95 percent, wherein the sandstone of three or more wells and the effective water drive control degree of the well are respectively improved by 6.49 percent and 6.72 percent. The control degrees of the transfer injection well sandstone and the effective water drive are respectively improved by 8.13 percent and 9.11 percent, wherein the control degrees of the multidirectional sandstone and the effective water drive are respectively improved by 23.41 percent and 24.17 percent.
Claims (1)
1. An oil field encrypted well injection and production system adjusting method comprises the following steps:
1) according to the three-dimensional seismic structure interpretation result, the newly added well area with imperfect injection-production relation is used for implementing oil well transfer injection; meanwhile, on the basis of the current well arrangement mode of encryption adjustment, a slow injection well is injected, and finally a four-point method area well pattern and a linear water injection mode are formed through adjustment;
2) the broken block closed area further improves the injection-production relation of the well area by adopting comprehensive excavation and potential methods such as well pattern recombination, well type adjustment, perforation layer optimization and the like;
3) preferentially transferring the ineffective and ineffective wells, controlling the yield influenced by the transfer to be a lower level, and suspending the transfer for the slow injection well with the oil production of more than 5t at present;
4) patching holes for pressure relief aiming at the combination measure of the well points with higher pressure and the layer positions;
5) the injection-production well spacing of the transfer well of the encryption adjusting well and the production wells of each well network in the block is kept above 100 m;
6) after the injection and production system is adjusted, applying a fine geological research result, improving the perforation corresponding rate of the oil-water well of the transfer injection well zone through hole patching, and further perfecting the single sand injection and production relation of the encryption adjustment well;
7) the injection of the shot hole well is not changed within 50m from the large fault on the plane of the oil production well at the edge of the fault, and the injection of the shot hole well is not changed within 10m from the break point when the break point is located at the oil layer part in the longitudinal direction;
8) the original water injection well area further improves the single sand injection and production relation by compensating part of the thickness.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117291125A (en) * | 2023-11-24 | 2023-12-26 | 中国石油大学(华东) | Comprehensive adjustment optimization method and system for water-flooding well pattern and perforation interval |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117291125A (en) * | 2023-11-24 | 2023-12-26 | 中国石油大学(华东) | Comprehensive adjustment optimization method and system for water-flooding well pattern and perforation interval |
| CN117291125B (en) * | 2023-11-24 | 2024-02-02 | 中国石油大学(华东) | Comprehensive adjustment optimization method and system for water-flooding well pattern and perforation interval |
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