CN111946312A - Method for prolonging effective period of water injection well - Google Patents
Method for prolonging effective period of water injection well Download PDFInfo
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- CN111946312A CN111946312A CN202010889356.0A CN202010889356A CN111946312A CN 111946312 A CN111946312 A CN 111946312A CN 202010889356 A CN202010889356 A CN 202010889356A CN 111946312 A CN111946312 A CN 111946312A
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- 238000002347 injection Methods 0.000 title claims abstract description 218
- 239000007924 injection Substances 0.000 title claims abstract description 218
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 174
- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000011010 flushing procedure Methods 0.000 claims abstract description 24
- 239000003814 drug Substances 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 7
- 230000008859 change Effects 0.000 claims abstract description 4
- 238000005406 washing Methods 0.000 claims description 40
- 239000002253 acid Substances 0.000 claims description 9
- 230000003044 adaptive effect Effects 0.000 claims description 9
- 230000020477 pH reduction Effects 0.000 claims description 9
- 239000002455 scale inhibitor Substances 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 7
- 239000004568 cement Substances 0.000 claims description 6
- 239000004094 surface-active agent Substances 0.000 claims description 6
- 230000002579 anti-swelling effect Effects 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 238000010276 construction Methods 0.000 claims description 5
- 230000002035 prolonged effect Effects 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims description 4
- 230000035945 sensitivity Effects 0.000 claims description 4
- 238000004458 analytical method Methods 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 2
- 230000035699 permeability Effects 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 5
- 230000008092 positive effect Effects 0.000 abstract description 5
- 238000006073 displacement reaction Methods 0.000 abstract description 4
- 230000007774 longterm Effects 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 7
- 239000009096 changqing Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000002354 daily effect Effects 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000003203 everyday effect Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241000237858 Gastropoda Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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Abstract
The invention provides a method for prolonging the effective period of water injection of a water injection well, which comprises the steps of tracking the dynamic state of water injection of the water injection well and the production dynamic state of a corresponding well group, analyzing the characteristics of water injection quantity and pressure change curves, and selecting closed circulation well flushing, injection increasing or injection of a comprehensive slug medicament to prolong the effective period of water injection after analyzing a water injection pressure curve and a water injection dynamic curve. The effective period of water injection in the invention refers to the days that the daily actual water injection of the water injection well can reach the injection allocation amount required by the oil reservoir. The water injection amount meets the oil reservoir injection allocation requirement, the formation energy can be supplemented in time, an effective pressure displacement system is established, and the reasonable pressure maintaining level is realized. The method has a very positive effect on the long-term effective and stable water injection of the water injection well, and the method has a good implementation effect in the ultra-low permeability reservoir.
Description
Technical Field
The invention relates to the field of petroleum industry, in particular to a method for prolonging the effective period of water injection of a water injection well.
Background
The Changqing oil field belongs to a typical low-permeability-ultralow-permeability sandstone oil reservoir, is influenced by a deposition environment, has strong heterogeneity of interlayer development of the Changqing oil field, large level difference between small layers, prominent contradiction of water absorption between layers and in-layer, low water drive utilization degree, slow establishment of an effective pressure displacement system and poor development effect. Along with the change from hypotonic reservoir to ultra-hypotonic and ultra-hypotonic reservoir development, the problem of insufficient injection of the water injection well is increasingly prominent, and after the insufficient injection, part of wells need to be repeatedly treated, so that the cost is high, the effective period of measures is short, and the effective period of part of wells is even less than 3 months.
Disclosure of Invention
In order to overcome the problems that after the existing water injection well is lack of injection, part of the well after the lack of injection needs to be repeatedly treated, the cost is high, and the effective period of the measures is short, the invention provides a method for prolonging the effective period of the water injection well for water injection.
The technical scheme adopted by the invention is as follows:
a method for prolonging the effective period of water injection well includes tracking the dynamic state of water injection well and the dynamic state of production well group, analyzing the curve characteristics of water injection quantity and pressure variation, and selecting closed circulation well washing, increasing injection or injecting comprehensive slug chemical to prolong the effective period of water injection.
The effective period of water injection refers to the days that the daily actual water injection can reach the injection allocation required by the oil reservoir.
The water injection pressure curve and the water injection dynamic curve of the analysis are as follows: if the rising amplitude of the injection water pressure in one month exceeds 10 percent or the actual injection water amount is less than 70 percent of the injection amount after continuous 15 days, follow-up measures are taken into consideration.
The method for carrying out closed circulation well washing comprises the following steps: the movable well washing vehicle is adopted for carrying out closed circulation well washing, and the well washing discharge capacity is 15-30 m3And h, the highest well washing pressure is 25MPa, the water quality index is monitored after well washing, if the oil content of a water outlet is less than or equal to 15mg/L and the impurities are less than or equal to 15mg/L, the well washing is qualified, otherwise, the well washing is continued until the requirement is met.
After the closed circulation well flushing is finished, if the dynamics and the pressure of the water injection well are normal, observation is continued, and if the injection allocation requirement can not be met, an adaptive injection increasing mode is selected subsequently.
The adaptive injection increasing mode is acidification or acid fracturing.
The selection of the comprehensive slug medicament type is determined by the reason of under-injection, if the block wettability is serious, a surfactant slug is added; if the formation is seriously scaled, adding a scale inhibitor slug; if the stratum has water sensitivity, adding an anti-swelling agent slug.
The comprehensive slug medicament injection construction is carried out by injecting 700 type cement truck through a well head, and the injected dose is expressed by a formula V ═ pi phi ra 2h determining the injection concentration of 0.5-3.0%, wherein V is the volume of the injected composite slug, pi is the circumferential ratio, phi is the average porosity, h is the thickness of the perforation section, raIs the radius of treatment.
Firstly, continuously tracking and analyzing a water injection pressure curve and a water injection dynamic curve, if the water injection pressure rise amplitude in one month exceeds 10 percent or the actual water injection amount is less than 70 percent of the injection allocation amount for 15 days continuously, then, recommending to carry out closed circulation well flushing, adopting a movable well flushing vehicle to carry out closed circulation well flushing, and monitoring the water quality index after well flushing, wherein if the oil content of a water outlet is less than or equal to 15mg/L, and the impurity content is less than or equal to 15mg/L, the well flushing is qualified, otherwise, the well flushing is continued until the requirement is met, and the well flushing time is 2-4 hours; after the closed circulation well washing is finished, if the production dynamic state and the water injection pressure of the water injection well are normal, continuing to observe; if the injection allocation requirement can not be met, the injection increasing is considered, such as acidification and acid fracturing; in addition, after the closed circulation well flushing or the injection increasing measures are taken, a comprehensive slug medicament is injected to prolong the effective period of water injection, and the type of the selected medicament is determined by the reason of insufficient injection.
The invention has the beneficial effects that:
the invention adopts the processes of analyzing a water injection pressure curve and a water injection dynamic curve, sealing and circularly washing a well, selecting an adaptive injection increasing mode and injecting a comprehensive slug medicament to prolong the validity period of water injection. The four processes can be selected and adjusted according to actual conditions, the effective water injection period is prolonged through multiple measures, the method has a positive effect on stable production of the water injection well by effectively and stably injecting water for a long time, and a better implementation effect is achieved in the ultra-low permeability reservoir by utilizing the method.
The following will be further described with reference to the accompanying drawings.
Drawings
Fig. 1 is a flow chart of a method for prolonging the effective period of water injection of a water injection well according to the present invention.
Detailed Description
Example 1:
in order to overcome the problems that after the existing water injection well is lack of injection, part of the well after the lack of injection needs to be repeatedly treated, the cost is high, and the effective period of measures is short, the invention provides the method for prolonging the effective period of water injection of the water injection well, which is shown in figure 1.
A method for prolonging the effective period of water injection well includes tracking the dynamic state of water injection well and the dynamic state of production well group, analyzing the curve characteristics of water injection quantity and pressure variation, and selecting closed circulation well washing, increasing injection or injecting comprehensive slug chemical to prolong the effective period of water injection.
The invention adopts the processes of analyzing a water injection pressure curve and a water injection dynamic curve, sealing and circularly washing a well, selecting an adaptive injection increasing mode and injecting a comprehensive slug medicament to prolong the validity period of water injection.
The four processes provided by the invention are not necessarily implemented each, and the adjustment sequence can be selected according to the actual situation.
The method prolongs the effective water injection period through multiple measures, has a very positive effect on the stable yield of the water injection well by effectively and stably injecting water for a long time, and achieves a better implementation effect in the ultra-low permeability reservoir by utilizing the method.
Example 2:
based on the example 1, in this example, the effective period of water injection preferably refers to the number of days that the daily actual water injection can reach the required injection allocation of the oil reservoir.
The water injection amount meets the oil reservoir injection allocation requirement, the formation energy can be supplemented in time, an effective pressure displacement system is established, and the reasonable pressure maintaining level is realized.
Preferably, the water injection pressure curve and the water injection dynamic curve of the analysis are as follows: if the rising amplitude of the injection water pressure in one month exceeds 10 percent or the actual injection water amount is less than 70 percent of the injection amount after continuous 15 days, follow-up measures are taken into consideration.
Preferably, the method for performing the closed circulation well washing comprises the following steps: the movable well washing vehicle is adopted for carrying out closed circulation well washing, and the well washing discharge capacity is 15-30 m3And h, the highest well washing pressure is 25MPa, the water quality index is monitored after well washing, if the oil content of a water outlet is less than or equal to 15mg/L and the impurities are less than or equal to 15mg/L, the well washing is qualified, otherwise, the well washing is continued until the requirement is met.
Preferably, after the closed circulation well flushing is finished, if the dynamics and the pressure of the water injection well are normal, observation is continued, and if the injection allocation requirement cannot be met, an adaptive injection increasing mode is selected subsequently.
Preferably, the adaptive injection increasing mode is acidification or acid fracturing.
Preferably, the selection of the type of the comprehensive slug medicament is determined by the reason of underinjection, and if the block wettability is serious, a surfactant slug is added; if the formation is seriously scaled, adding a scale inhibitor slug; if the stratum has water sensitivity, adding an anti-swelling agent slug.
The surfactant slug, the scale inhibitor slug and the anti-swelling agent slug adopted in the invention are all the prior art, and the invention is not further explained.
Preferably, the comprehensive slug medicament injection construction is performed by a 700-type cement truck through a wellhead, and the injection dosage is expressed by a formula V ═ pi φ ra 2h determining the injection concentration of 0.5-3.0%, wherein V is the volume of the injected composite slug, pi is the circumferential ratio, phi is the average porosity, h is the thickness of the perforation section, raIs the radius of treatment.
The invention adopts the processes of analyzing a water injection pressure curve and a water injection dynamic curve, sealing and circularly washing a well, selecting an adaptive injection increasing mode and injecting a comprehensive slug medicament to prolong the validity period of water injection. The four processes provided by the invention are not necessarily implemented each, and the adjustment sequence can be selected according to the actual situation. The method prolongs the effective water injection period through multiple measures, has a very positive effect on the stable yield of the water injection well by effectively and stably injecting water for a long time, and achieves a better implementation effect in the ultra-low permeability reservoir by utilizing the method.
Example 3:
based on embodiment 1 or 2, the present embodiment provides a selective construction process of the method for prolonging the effective period of water injection of a water injection well as shown in fig. 1.
Firstly, a water injection pressure curve and a water injection dynamic curve are continuously tracked and analyzed, and if the water injection pressure rise amplitude in one month exceeds 10 percent or the actual water injection amount is less than 70 percent of the injection allocation amount in 15 continuous days, the next step of measures are taken into consideration. If the pressure of water injected in one month is higherThe rising amplitude exceeds 10 percent, or the actual water injection amount is less than 70 percent of the injection allocation amount within 15 continuous days, at the moment, the well is recommended to be washed in a closed circulation mode, a movable well washing vehicle is adopted to carry out the well in a closed circulation mode, and the well washing discharge capacity is 15-30 m3And h, the highest well washing pressure is 25MPa, the water quality index is monitored after well washing, if the oil content of a water outlet is less than or equal to 15mg/L and the impurities are less than or equal to 15mg/L, the well washing is qualified, otherwise, the well washing is continued until the requirement is met, and the well washing time is 2-4 hours.
After the closed circulation well washing is finished, if the production dynamic state and the water injection pressure of the water injection well are normal, continuing to observe; if the injection allocation requirement can not be met, the next measures, such as acidification and acid fracturing, are considered, the implementation scales of the acidification and the acid fracturing are designed according to specific well conditions, the acidification and the acid fracturing are the prior art and are selected according to requirements, and further description is not carried out in the invention. In addition, in order to prolong the effective period of water injection, after well flushing or injection increasing measures, a comprehensive slug medicament is injected, and the type of the selected medicament is determined by the reason of insufficient injection. If the block wettability is serious, adding a comprehensive slug mainly comprising a surfactant; if the formation is seriously scaled, a slug mainly comprising a scale inhibitor is added; if the stratum has stronger water sensitivity, a slug mainly comprising an anti-swelling agent is added. The construction is carried out by injecting 700 type cement truck through a well head, and the injection dosage is expressed by a formula V ═ pi phi ra 2h is calculated to obtain the injection concentration of 0.5-3.0%, wherein V is the volume of the comprehensive slug to be injected, pi is the circumferential rate, phi is the average porosity, h is the thickness of the perforation section, and r isaIs the radius of treatment.
Example 4:
based on the example 3, in the example, the ultra-low permeability block ring a2 water injection well of the Changqing oil field is taken as an example, the water injection well is clear water, 25 sides/day of injection allocation and 25 sides/day of actual injection are performed, the well is under-injected from the middle ten days of 3 months in 2018, the water injection pressure is continuously increased from 17Mpa to 19Mpa, the actual water injection amount is 5-7 sides/day, the requirement in flow judgment is met, then the well is washed for 3 hours by adopting a closed cycle, the oil content at the water outlet is detected to be 12mg/L, the oil content at the water outlet is detected to be 10mg/L, the requirement is met, the pressure is reduced from 19Mpa to 18.2Mpa after the well is washed, the daily water injection amount is increased to be 12-15 sides/dayThe injection allocation requirements cannot be met. Therefore, the well is subjected to a conventional acidification measure in the middle of 4 months, retarded acid is injected into the well for 30 square hours, then the water injection pressure is reduced to 16.8MPa, and in order to prolong the effective period of water injection, according to the characteristic that the block wettability is more serious, V is pi phi ra 2h formula calculation, the average porosity phi of the well before logging is 10%, the thickness h of the perforation section of the well is 6 m, and the radius r of treatmenta1.5 m, calculated as 4.24m slug of surfactant injected3Taking 3.0% as an example, 141-square solution is required to be injected after preparation, the solution is directly injected from a wellhead by a 700-type cement truck, after surface activator slugs are injected, the injection pressure of the well is basically stable, the injection pressure is still 17.1MPa after 2019 and 4 months, 25-square injection is performed every day, and the purpose of stable water injection for a long time is achieved.
Example 5:
based on the example 3, in the example, the water injection well of the extra-low permeability block roc-2 in the Changqing oil field is taken as an example, the water injection quality of the well is clean water, 20 prescriptions/day of injection is allocated, 20 prescriptions/day of injection is implemented, the well is under-injected from 5 months and 16 days in 2018, the water injection pressure is continuously increased from 17Mpa to 17.5Mpa, and the implemented water injection quantity is 15-17 prescriptions/day. And (4) determining closed circulation well flushing through continuous tracking, detecting that the oil content at a water gap is 10mg/L and the impurity content is 8mg/L after the closed circulation well flushing is carried out for 4 hours, meeting the requirement, reducing the pressure from 17.5MPa to 16.7MPa after the well flushing, and normally injecting water into the well. But the stratum of the area of the well is seriously scaled, and in order to prolong the effective period of water injection, the injection of the scale inhibitor is determined according to the condition that V is pi phi ra 2h formula, the average porosity phi of the well before logging is 9%, the thickness h of the perforation section of the well is 5m, and the radius r of treatmentaSelecting 2.0 m, calculating to obtain 5.65m slug of scale inhibitor3Taking 2.0% concentration as an example, 280 parts of solution is required to be injected after preparation, the solution is directly injected from a wellhead by a 700-type cement truck, after the scale inhibitor slug is injected, the well pressure is always 17.0Mpa until 5 months in 2019, water injection is normal, and the purpose of long-term stable water injection is achieved.
Along with the change from hypotonic reservoir to ultra-hypotonic and ultra-hypotonic reservoir development, the problem of insufficient injection of the water injection well is increasingly prominent, and after the insufficient injection, part of wells need to be repeatedly treated, so that the cost is high, the effective period of measures is short, and the effective period of part of wells is even less than 3 months. Aiming at the situation, the key point is to search a method for prolonging the effective period of water injection of the water injection well of the ultra-low permeability reservoir stratum and the ultra-low permeability reservoir stratum, the effective period of water injection of the water injection well is prolonged by combining enhanced management and prevention and control, the strategy of low-cost development is met, and the method has positive effects on cost reduction and efficiency improvement. The invention has low cost and effectively prolongs the validity period of water injection of the water injection well. The effective period of water injection refers to the days that the water injection quantity can reach the injection quantity required by the oil reservoir every day. After the effective period of water injection is stably prolonged, the water injection quantity meets the requirement of oil reservoir injection allocation, the formation energy can be supplemented in time, and an effective pressure displacement system and a reasonable pressure maintaining level are established.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention, and all designs identical or similar to the present invention are within the scope of the present invention. The reagents and methods thereof which are not described in detail in this embodiment belong to the well-known and commonly used methods in the industry, and are not described herein.
Claims (9)
1. A method for prolonging the effective period of water injection of a water injection well is characterized in that: the dynamic water injection state of the water injection well and the production state of the corresponding well group are tracked, the characteristics of the water injection amount and the pressure change curve are analyzed, and the effective period of water injection is prolonged by selecting closed circulation well washing, injection increasing or injection of comprehensive slug medicaments after the water injection pressure curve and the water injection dynamic curve are analyzed.
2. The method for prolonging the validity period of water injection of the water injection well according to claim 1, wherein the method comprises the following steps: the effective period of water injection refers to the days that the daily actual water injection can reach the injection allocation required by the oil reservoir.
3. The method for prolonging the validity period of water injection of the water injection well according to claim 1, wherein the method comprises the following steps: the water injection pressure curve and the water injection dynamic curve of the analysis are as follows: if the rising amplitude of the injection water pressure in one month exceeds 10 percent or the actual injection water amount is less than 70 percent of the injection amount after continuous 15 days, follow-up measures are taken into consideration.
4. The method for prolonging the validity period of water injection of the water injection well according to claim 1, wherein the method comprises the following steps: the method for carrying out closed circulation well washing comprises the following steps: the movable well washing vehicle is adopted for carrying out closed circulation well washing, and the well washing discharge capacity is 15-30 m3And h, the highest well washing pressure is 25MPa, the water quality index is monitored after well washing, if the oil content of a water outlet is less than or equal to 15mg/L and the impurities are less than or equal to 15mg/L, the well washing is qualified, otherwise, the well washing is continued until the requirement is met.
5. The method for prolonging the validity period of water injection of the water injection well according to claim 4, wherein the method comprises the following steps: after the closed circulation well flushing is finished, if the dynamics and the pressure of the water injection well are normal, observation is continued, and if the injection allocation requirement can not be met, an adaptive injection increasing mode is selected subsequently.
6. The method for prolonging the validity period of water injection of the water injection well according to claim 5, wherein the method comprises the following steps: the adaptive injection increasing mode is acidification or acid fracturing.
7. The method for prolonging the validity period of water injection of the water injection well according to claim 1, wherein the method comprises the following steps: the selection of the comprehensive slug medicament type is determined by the reason of under-injection, if the block wettability is serious, a surfactant slug is added; if the formation is seriously scaled, adding a scale inhibitor slug; if the stratum has water sensitivity, adding an anti-swelling agent slug.
8. The method for prolonging the validity period of water injection of a water injection well according to claim 1 or 7, wherein the method comprises the following steps: the comprehensive slug medicament injection construction is carried out by injecting 700 type cement truck through a well head, and the injected dose is expressed by a formula V ═ pi phi ra 2h determining the injection concentration of 0.5-3.0%, wherein V is the volume of the injected composite slug, pi is the circumferential ratio, phi is the average porosity, h is the thickness of the perforation section, raIs a half of a treatmentAnd (4) diameter.
9. The method for prolonging the validity period of water injection of the water injection well according to claim 1, wherein the method comprises the following steps: firstly, continuously tracking and analyzing a water injection pressure curve and a water injection dynamic curve, if the water injection pressure rise amplitude in one month exceeds 10 percent or the actual water injection amount is less than 70 percent of the injection allocation amount for 15 days continuously, then, recommending to carry out closed circulation well flushing, adopting a movable well flushing vehicle to carry out closed circulation well flushing, and monitoring the water quality index after well flushing, wherein if the oil content of a water outlet is less than or equal to 15mg/L, and the impurity content is less than or equal to 15mg/L, the well flushing is qualified, otherwise, the well flushing is continued until the requirement is met, and the well flushing time is 2-4 hours; after the closed circulation well washing is finished, if the production dynamic state and the water injection pressure of the water injection well are normal, continuing to observe; if the injection allocation requirement can not be met, the injection increasing is considered, such as acidification and acid fracturing; in addition, after the closed circulation well flushing or the injection increasing measures are taken, a comprehensive slug medicament is injected to prolong the effective period of water injection, and the type of the selected medicament is determined by the reason of insufficient injection.
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| CN114198072A (en) * | 2021-11-29 | 2022-03-18 | 中国海洋石油集团有限公司 | Optimized deployment method for water-drive development well pattern of multi-layer commingled production reservoir |
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