CN101148985A - Adjusting method for oil field injection and extraction system in ultra-high water-containing period - Google Patents
Adjusting method for oil field injection and extraction system in ultra-high water-containing period Download PDFInfo
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Abstract
The present invention is method of regulating oil field water injecting and oil producing system in very high water containing stage, and aims at solving the problems of too great ratio between oil producing well number and water injecting well number, too high water injecting pressure, and too low stratum pressure and flow pressure in very high water containing stage. The present invention adopts water injecting and oil producing mode with transverse linear water injecting well net, five point area well net, longitudinal linear water injecting well net, and determinant type water injecting well net. The present invention can raise oil output greatly.
Description
Technical field
The present invention relates to a kind of method of adjustment of oil field injection and extraction system.
Background technology
Ultra-high water cut stage is meant that the oil field comprehensive water cut reaches the period more than 90%.Large-scale terrigenous deposit multiple zone heterogeneous body sandstone oil field, the main feature of its oil reservoir are that the number of plies is many, complex shape, serious heterogeneity.After large-scale terrigenous deposit multiple zone heterogeneous body sandstone oil field enters the ultra-high water cut stage mining phase, the injection and extraction system adjustment mainly is to refer to that at the block series of strata (anti-9 method areal well patterns are a kind of flooding patterns to anti-9 method areal well patterns, with 1 mouthful of water injection well is that the center is provided with 8 mouthfuls of oil wells on every side, each flooding unit has 9 mouthfuls of wells, it is 3: 1 that the oil-water well of each flooding unit is counted ratio, promptly 1 mouthful of water injection well provide water filling need for 3 mouthfuls of producing wells) the oil-water well number is than for bigger than normal, water injection capacity does not satisfy the needs of production fluid amount, water injection pressure is higher, strata pressure and flowing pressure are on the low side, and the oil field cover decreases relatively problems such as part wellblock flooding pattern imperfection.Because oil field development is a process that the oil field is constantly adjusted, the Development characteristics difference of different development phases, adjustment practice difference, through once encrypting adjusting stage and superencipher after the adjusting stage, the injection and extraction system adjustment is primarily aimed at the series of strata well pattern of separate, the even perforation independent and perfect of series of strata well pattern, relies on the producing well metaideophone separately, changes the liquid flow path direction, increases the water filling well point, improves injection and extraction system.But ultra-high water cut stage series of strata well pattern is perfect mutually, and well pattern is adjusted one by one and formed local notes in the evolution process to adopt exploitation situation such as imperfection comparatively complicated, has many comparatively outstanding contradiction.It is traditional that only can't solve the ultra-high water cut stage oil field injection and extraction by the method for utilizing old well metaideophone concerns problem.
Summary of the invention
The objective of the invention is for solving existing ultra-high water cut stage mining phase, the injection and extraction system adjustment mainly is to refer to that at the block series of strata anti-9 method areal well pattern oil-water well numbers ratio is for bigger than normal, water injection capacity does not satisfy the needs of production fluid amount, water injection pressure is higher, strata pressure and flowing pressure are on the low side, and oil field cover decreases relatively, and flooding pattern incomplete problem in part wellblock provides a kind of method of adjustment of oil field injection and extraction system in ultra-high water-containing period.The method of adjustment of oil field injection and extraction system in ultra-high water-containing period of the present invention realizes according to the following steps: one, at first injection and extraction system is optimized adjustment, the end hole of the row of adopting forms the injection-production method of horizontal linear injection pattern between annotating between the employing metaideophone, perhaps the metaideophone corner well forms the injection-production method of five-spot areal well pattern, perhaps the end hole of metaideophone oil recovery well array forms the injection-production method of vertical linear injection pattern, perhaps interval metaideophone corner well forms the injection-production method of block water filling unit, perhaps the end hole of metaideophone oil recovery well array forms vertical two row's water injection well folders, three row's producing wells at interval, the injection-production method of the ranks shape injection pattern that middle ware is adopted between annotating; Two, adjust well spacing, it is between 160～190m that well spacing is adjusted to average distance.The situation of present oil field injection and extraction system in ultra-high water-containing period that the present invention has passed through comprehensive systematically assay, complexity in conjunction with the ultra-high water cut stage injection-production relation, at dissimilar oil reservoirs, different geology characteristics, different exploitation situations, different existing well pattern conditions, the injection and extraction system adjustment is reduced five kinds of patterns, taking into full account " five combinations " preferred injection and extraction system method of adjustment simultaneously combines with original well pattern, combine with three encryption adjustment, combine with the complementary off set drilling of well pattern, with improve the single sand body injection-production relation and combine, combine with the improvement of poor efficiency well, optimize supporting technology after the injection and extraction system adjustment, implement the back water drive and respectively overlap the exploitation effect of series of strata and all obtain in various degree improvement, efficiently solve the ultra-high water cut stage multilayer and be the exploitation contradiction under many well patterns condition.Adjust 50.6 tons of back individual well day production fluids, 3.9 tons of day produce oils, comprehensive water cut 92.28%, a day produce oil amplitude improves 34.48%, 1.29 percentage points of water cut decreases.Outstanding effect shows the burden of having alleviated the fractional water flooding well, average water injection pressure drops to 12.11Mpa by 12.42Mpa, 0.31Mpa has descended, the well number of bursting split pressure water filling drops to 40.5% by 69.8%, production capacity is greatly improved, and contrasts 235 mouthfuls of no measure producing well accumulative totals and increases oil 3.4 * 10
4T, 0.42 percentage point of moisture decline, whole district's lapse rate is slowed down 1.27 percentage points.The present invention will make water drive injection and extraction system adjustment technology become better and approaching perfection day by day more, for the injection and extraction system adjustment of large-scale terrigenous deposit multiple zone heterogeneous body sandstone oil field ultra-high water cut stage provides powerful technical support and assurance.
Description of drawings
Fig. 1 is that the end hole of the row of adopting forms the schematic diagram of horizontal linear injection pattern between annotating between metaideophone, Fig. 2 is the schematic diagram that the metaideophone corner well forms the five-spot areal well pattern, Fig. 3 is the schematic diagram that the end hole of metaideophone oil recovery well array forms the vertical linear injection pattern, Fig. 4 is the schematic diagram that interval metaideophone corner well forms block water filling unit, and Fig. 5 is that the end hole of metaideophone oil recovery well array at interval forms the ranks shape injection pattern schematic diagram of adopting between vertical two row's water injection wells folders, three row's producing wells, middle ware notes.The end hole of the row of adopting between annotating between the Reference numeral 1-among the figure, 2-corner well, the end hole of 3-oil recovery well array.
The specific embodiment
The specific embodiment one: (referring to Fig. 1～Fig. 5) method of adjustment of present embodiment oil field injection and extraction system in ultra-high water-containing period realizes according to the following steps: one, at first injection and extraction system is optimized adjustment, the end hole of the row of adopting forms the injection-production method of horizontal linear injection pattern between annotating between the employing metaideophone, perhaps the metaideophone corner well forms the injection-production method of five-spot areal well pattern, perhaps the end hole of metaideophone oil recovery well array forms the injection-production method of vertical linear injection pattern, perhaps interval metaideophone corner well forms the injection-production method of block water filling unit, perhaps the end hole of metaideophone oil recovery well array forms vertical two row's water injection well folders, three row's producing wells at interval, the injection-production method of the ranks shape injection pattern that middle ware is adopted between annotating; Two, adjust well spacing, it is between 160～190m that well spacing (between any two adjacent wells) is adjusted to average distance.
The specific embodiment two: the end hole of the row of adopting formed the injection-production method of horizontal linear injection pattern between (referring to Fig. 1) present embodiment adopted and annotates between metaideophone, and it is 175m that well spacing (between any two adjacent water injection wells and producing well) is adjusted to average distance.Present embodiment water drive control degree is up to 94.4%, and wherein multidirectional connection ratio is 55.8%, and increase rate is 23.4%, and the ultimate recovery value reaches as high as 44.7%, and good with the joining relation of former well pattern.
The specific embodiment three: (referring to Fig. 1～Fig. 5) present embodiment combines with three encryption adjustment, by adjusting well spacing (former well spacing is 250m), to improve thin poor reservoir and to show outer field development degree.1.0 of direction numbers are imitated in three average individual well increases of infill well, encrypt adjustment series of strata benefit at three times and open sandstone thickness 5.9m, effective thickness 1.8m.Adjust and afterwards encrypt to adjust the series of strata thin poor reservoirs three times and show outer field development degree and obviously improve, bring up to present 70.9%, 50.4% respectively by 59.6%, 42.4% before adjusting.
The specific embodiment four: (referring to Fig. 1～Fig. 5) present embodiment combines with the complementary off set drilling of well pattern, improves injection and extraction system.It also is once to encrypt the notes extraction well point of adjusting series of strata that east, the Bei San district basic well pattern grape flower series of strata of Daqing oil field are annotated producing well.After grape flower series of strata oil-water well in Portugal's one group of oil reservoir polymer displacement oil well net all utilizes, cause northern 3-5 row to lack 10 mouthfuls of extraction well points, according to the well pattern present situation at the preferred different method of adjustment of different well arrays, determine to lack 7 mouthfuls of extraction well points northern 3-5, northern 3-6 row, 5 mouthfuls are injected the well point, north 2-1 row lacks 10 mouthfuls of extraction well points, and these wellblock injection-production relations need further perfect.According to the well pattern present situation at the preferred different method of adjustment of different well arrays, determine to mend 21 mouthfuls of the new water injection wells of brill northern 3-5, northern 3-6 row, north 2-1 row makes full use of with superencipher and adjusts series of strata well location complementary relationship, and 8 mouthfuls of superencipher water injection wells are implemented perforations adding in order to improve infilled well pattern one time.58 mouthfuls of producing wells that are communicated with around the new well stake back, the average individual well oily 2.3t that increases day by day, moisture decline 2.25%, strata pressure improves 0.22MPa, and average individual well accumulative total increases oily 298t.The superencipher water injection well is implemented to carry out dispensing behind the perforations adding in good time, and water filling interval number is increased to 5.9 by original 3.8, is communicated with 41 mouthfuls of producing wells around adjusting the back, the average individual well oily 1.1t that increases day by day, and moisture decline 0.67%, strata pressure improves 0.14Mpa.
The specific embodiment five: (referring to Fig. 1～Fig. 5) present embodiment combines with improving the single sand body injection-production relation, implement the corresponding perforations adding of oil-water well, improve the single sand body notes and adopt corresponding rate.To the corresponding perforations adding of other oil-water well in converted production well, relevant producing well, the series of strata.Improve the principle of injection-production relation according to single sand body, the converted production well perforations adding is decided notes to adopt, relevant producing well perforations adding is adopted being doomed, other oil-water well is then taken all factors into consideration according to injection-production relation situation of change after the injection and extraction system adjustment and is carried out perforations adding in the series of strata, emphasis is to be based on the interior single sand body of these series of strata to improve injection-production relation, takes all factors into consideration the joining relation of converted production well and each cover series of strata well pattern, increases multidirectional connection thickness proportion, improve water drive control degree, fully excavate the remaining oil potentiality.The whole district adjusts 25 mouthfuls of wells of the corresponding perforations adding of back oil-water well, and average individual well is mended and opened 4.8 layers, and mend and open sandstone thickness 8.0m, effective thickness 4m, the average individual well liquid 27.2t that increases day by day behind the perforations adding, the oily 3.8t that increases day by day, 3.9 percentage points of moisture declines, the average effective phase is more than 6 months.
The specific embodiment six: (, adjust flexibly and improve regional whole development effect referring to Fig. 1～Fig. 5) present embodiment is administered with the poor efficiency well and combined.The mode of metaideophone end hole is adopted in the northern three-east injection and extraction system adjustment of Daqing oil field on the whole, but the concrete characteristics of calmodulin binding domain CaM are adjusted flexibly when adjusting, and improve the whole development effect.As Bei3-4-064Jing be northern three-east once encrypt adjust annotate between series of strata between a bite producing well of the row of adopting, by once encrypting the series of strata injection and extraction system adjustment mode of adjusting, this well needs metaideophone, but concern from well location, this well location near the 91# tomography, the unidirectional effect, at present full well is penetrated out sandstone 20.6m, effective 9.5m, formation capacity 4.735 μ m
2.m, the back day production fluid 25t that goes into operation, day produce oil 2t, moisture 90.3%, baric flow 1.17MPa does not go up the liquid closing well in February, 2002, belong to a bite poor efficiency well (poor efficiency well produce oil on duty for the day is less than the well of 1t), cumulative oil production has only 5446t before this well closing well, than secondary well average level low 80.2%.For improving regional whole development effect, consider metaideophone corner well north 3-fourth 5-64 well, at present the high moisture closing well of this well.The present day production fluid 18t of Bei3-4-064Jing behind the metaideophone, day produce oil 4t, moisture 77.8%, stream is pressed 2.94MPa, development effectiveness be improved significantly.
To sum up show, the mode of ultra-high water cut stage injection and extraction system adjustment should not be the mode of single dependence OW metaideophone again, must change into based on old well metaideophone, with the mode that multiple measures such as perforations adding, benefit well and the complementary utilization of well pattern combine, integral body is improved injection-production relation.
The water drive exploitation is adjusted, determine that reasonable injection-production ratio is the important assurance that keeps oil reservoir strata pressure, the moisture rising of control and slow down production decline on the one hand, on the other hand, injection-production ratio is adjusted in the reasonable range, can reduce the water injection rate in the higher area of part injection-production ratio, further improve the water drive development benefit.Determine reasonable injection-production ratio according to stage injection-production ratio and pressure reduction relation curve after the three-east injection and extraction system adjustment of north.Strata pressure is a rational state to return near the original formation pressure after the injection and extraction system adjustment, but recover unsuitable too fast, adjusting back pressure rise amplitude is advisable with annual 0.15～0.25MPa, according to the stage pressure reduction of a superencipher well and the relation of injection-production ratio, adjusted injection-production ratio is once encrypted the adjustment series of strata and be should be 1.6～1.7, and the superencipher well is encrypted the adjustment series of strata and be should be 2.1～2.2.
The ultra-high water cut stage oil reservoir carries out the injection and extraction system adjustment and should by doing the reasonable segmentation adjustment of separate water injection well well, improve the adjustment effect of injection and extraction system in the vertical in conjunction with single layer of sand water logging, producing status owing to water logging, producing status complexity.15 mouthfuls of water injection wells are adjusted in whole district's segmentation, the interval number is increased to 103 by 93, and water injection rate of interval drops to 2690 cubic metres by 3685 cubic metres, and wherein major oil reservoir precipitation is 445 cubic metres, 1440 cubic metres of non-major oil reservoir water lifts, be communicated with 29 mouthfuls of wells on every side, day production fluid is increased to present 2079 tons by 1608 tons before adjusting, and a day produce oil is increased to 143 tons by 83 tons, water content drops to 93.18% by 94.84%, increase day by day 16.9 tons of liquid of average individual well, 2.1 tons of the oil of increasing day by day, water content descends 1.66%.
Will make full use of the perfect opportune time of injection-production relation after the injection and extraction system adjustment, by the reasonable transfer of water injection rate between the old and new's water injection well, between high moisture good oil reservoir and low moisture poor oil reservoir, the change of promotion liquid flow path direction further improves flood effectiveness in the plane.According to the converted production well and the oil well sound attitude data on every side of newly drowning oneself in a well, water injection rate between the old and new's well is rationally mated.Converted production well and stepout well day injection allocation 6100m
3/ d, water injection intensity 8.5m
3/ d.m, the corresponding interval water injection intensity of wherein high moisture, good oil reservoir is 7.4m
3/ d.m, low moisture, the corresponding interval water injection intensity of thin poor reservoir is 9.5m
3/ d.m, the old water injection well waterflood project in metaideophone wellblock is reduced in right amount simultaneously, and a day injection allocation is adjusted downward to 5478m
3/ d, water injection intensity is by 9.3m
3/ d.m drops to 7.9m
3/ d.m.
The oil well extract mainly is by amplifying producing pressure differential and the difference oil reservoir being taked in good time modification measures, answer trace analysis after the injection and extraction system adjustment, in time catch the opportune time of being imitated, promote the whole district evenly to take effect with a definite target in view, the whole district implements to transfer ginseng after the adjustment of Daqing oil field Bei San district east system, change pump, pressure break, production fluid rises to 58.4 tons by 45 tons average individual well day after the acidifying measure, day produce oil rises to 4.1 tons by 2.9 tons, moisturely drop to 93.0% by 93.7%, stream is pressed and is dropped to 3.85Mpa by 5.46Mpa, increase day by day 13.4 tons of liquid of average individual well, increase day by day oily 1.2 tons, moisture decline 0.7%.
Claims (3)
1. the method for adjustment of an oil field injection and extraction system in ultra-high water-containing period, the method of adjustment that it is characterized in that oil field injection and extraction system in ultra-high water-containing period realizes according to the following steps: one, at first injection and extraction system is optimized adjustment, the end hole of the row of adopting forms the injection-production method of horizontal linear injection pattern between annotating between the employing metaideophone, perhaps the metaideophone corner well forms the injection-production method of five-spot areal well pattern, perhaps the end hole of metaideophone oil recovery well array forms the injection-production method of vertical linear injection pattern, perhaps interval metaideophone corner well forms the injection-production method of block water filling unit, perhaps the end hole of metaideophone oil recovery well array forms vertical two row's water injection well folders, three row's producing wells at interval, the injection-production method of the ranks shape injection pattern that middle ware is adopted between annotating; Two, adjust well spacing, it is between 160～190m that well spacing is adjusted to average distance.
2. the method for adjustment of oil field injection and extraction system in ultra-high water-containing period according to claim 1 is characterized in that it is 175m that well spacing is adjusted to average distance.
3. the method for adjustment of oil field injection and extraction system in ultra-high water-containing period according to claim 1 is characterized in that encrypting adjustment series of strata benefit at three times opens sandstone thickness 5.9m, effective thickness 1.8m.
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