CN112878954A - Design method of adjustment construction slug of underground river oil reservoir flow channel - Google Patents
Design method of adjustment construction slug of underground river oil reservoir flow channel Download PDFInfo
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- CN112878954A CN112878954A CN202110092339.9A CN202110092339A CN112878954A CN 112878954 A CN112878954 A CN 112878954A CN 202110092339 A CN202110092339 A CN 202110092339A CN 112878954 A CN112878954 A CN 112878954A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
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Abstract
The invention discloses a design method of a slug for adjustment construction of a flow passage of a subsurface river reservoir, which comprises the following steps: sequentially injecting a test injection slug, a main body slug, a reinforcing slug and a high-pressure water slug into the well of the underground river oil reservoir; the pilot injection slug consists of water, a flow-regulating particle slug with the highest concentration and water; the main body slug and the reinforcing slug are both composed of a plurality of groups of first slugs and second slugs, the first slugs are composed of water and flow channel adjusting particles, and the second slugs are composed of polymer solution; the high-pressure water slug is water, and the amount of the high-pressure water slug is half of the water injection amount of one water injection period of the well before the flow channel adjustment construction; the injection pressure of the high-pressure water slug is 0-5MPa higher than that of the well before the flow channel adjustment construction. The invention can ensure the effective injection of particles in the adjustment construction process of the underground river oil reservoir flow passage and ensure the water injection development effect after construction.
Description
Technical Field
The invention relates to the technical field of oil and gas field development, in particular to a design method of a slug for adjustment construction of a flow passage of a subsurface river reservoir.
Background
In the process of oil and gas field development, slug displacement is often adopted to improve the recovery ratio, most of related slugs in the prior art relate to the fields of weathering crust reservoir surface active agent displacement of reservoir oil, sandstone composite profile control and flooding, sandstone polymer displacement of reservoir oil, gel plugging of fractured low-permeability reservoirs and the like, and the slugs can not be directly applied to adjustment construction of a subsurface carbonate reservoir surface weathering crust karst cavity flow-pipe flow-seepage coupling flow channel.
For example, patent CN105840156A (a multi-segment plug composite profile control and flooding process) discloses a multi-segment plug composite profile control and flooding process, which comprises the following steps: (1) firstly, a front slug is injected, and 50m of quicklime water with the mass concentration of 0.5 percent is injected into the front slug3And then injecting carbon dioxide 2m3Door, roomEvery 1 day, adding 0.5% quicklime water 50m3Post injection of 2m carbon dioxide3Repeating the alternate injection for 3-5 times; (2) then the main slug is injected, the profile control agent is injected, and the injection amount of the first profile control agent is 300m3-500m3Then injecting carbon dioxide for 30m3Repeatedly injecting for 3-5 times; (3) after the main slug is injected, petroleum sulfonate surfactant solution with the mass concentration of 7-8% is injected for 500m3Injecting carbon dioxide 200m3(ii) a (4) After the construction is finished, water injection is required to be recovered. The process can obviously improve the sweep efficiency, can also improve the oil washing efficiency, can obviously reduce the water content of a block and improve the oil field recovery ratio.
As another example, the literature (Zhang. fractured reservoir multiple slug gel profile control technology research and application [ J]2016,33(1):46-50) in order to research the profile control mechanism and effect of the multi-section plug profile control agent on the fractured low-permeability oil reservoir, the physical process of the multi-section plug profile control agent for plugging a single fracture and for profile control on a composite fracture system is researched through an indoor visual fracture model, the multi-section plug profile control mechanism of the fractured low-permeability oil reservoir is explained, and a multi-section plug deep profile control mine field test is carried out in the eastern oil field. Indoor experiments and mine field experiments show that: for a single crack, the multi-section plug profile control plugging process is divided into two stages: in the gel filling stage and the gel compacting stage, the profile control agent is injected into the small section plug for multiple times, and the pressure gradient of the water drive is improved by more than 2 times compared with the pressure gradient of the water drive after the large section plug is continuously injected; for a composite fracture system, the multi-section plug profile control plugging process then comprises three stages: the profile control agent selectively enters a phase, a gel filling phase and a gel compacting phase, and finally the water absorption profile of the fracture system is improved to the maximum extent. After the test area of the eastern oilfield is prolonged and profile control is carried out on the deep part of a multi-section plug, the water injection well is injected with water normally, the water injection pressure is increased to 8.5MPa from 0.25MPa, and the water injection quantity is increased from 2.0m3D rises to 8.0m3And d, the daily oil increment of the oil well is 2.52t, the average water content of the oil well is reduced to 71.7 percent from more than 90 percent, and the multi-section plug deep profile control technology obtains better mine field test effect and can be used as one of the optimal technologies for oil increment and water reduction measures of the fractured low-permeability oil reservoir.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a design method of a slug for adjustment construction of a flow passage of a reservoir of a underground river.
The technical scheme of the invention is as follows:
a design method of a slug for adjustment construction of a flow channel of a subsurface river reservoir comprises the following steps:
sequentially injecting a test injection slug, a main body slug, a reinforcing slug and a high-pressure water slug into the well of the underground river oil reservoir;
the test injection slug consists of oil field water, flow passage adjusting particles and oil field water;
the main body slug and the reinforcing slug are both composed of a plurality of groups of first slugs and second slugs which are alternately arranged, the first slugs are composed of oilfield water and flow channel adjusting particles, the second slugs are composed of polymer solution, and the concentration of the first slugs of the reinforcing slug is adjustable;
the high-pressure water slug is oilfield water, the amount of the high-pressure water slug is half of the water injection amount of the well in one water injection period before the flow channel adjustment construction, and the injection pressure of the high-pressure water slug is 0-5MPa higher than the water injection pressure of the well before the flow channel adjustment construction.
Preferably, the amounts of the oil field water of the slug injected in the test twice are the well bore volume, and the amount of the flow channel adjusting particles of the slug injected in the test is defined by the slug quantitative principle.
Preferably, the amount of the first slug of the body slug is defined by the slug quantification principle, and the amount of the second slug of the body slug is 50-80 square.
Preferably, the first slug concentration of the reinforced slug is determined by the injection pressure of the slug of the previous group, in particular:
if no pressure climbing phenomenon occurs in the construction process, the quantity of a first section of the reinforced section plug is defined by a section plug quantitative principle, and the quantity of a second section of the reinforced section plug is 80-100 square;
and if the injection pressure of the first section plug is obviously higher than that of the previous section plug in the construction process, directly injecting the second section plug, wherein the volume of the second section plug of the reinforced section plug is the volume of the shaft.
Preferably, the slug quantification principle is: slug amount × slug concentration <0.7 open hole volume.
Preferably, the flow channel adjusting particles are medium-density particles, and the density range of the medium-density particles is [ rho, rho +0.06g/cm [ ]3]And rho is the density of formation water.
Preferably, the flow channel adjusting particles are a mixture of asphalt, wood chips and walnut shells.
Preferably, the weight ratio of the asphalt, the wood chips and the walnut shells is 20-40: 20-40: 20-40.
The invention has the beneficial effects that: the invention adopts a sectional slug method to inject the four parts of the pilot injection slug, the main slug, the reinforcing slug and the high-pressure water slug in sequence, and the used products and the used amount of the slugs are different, so that the invention can ensure the effective injection of particles in the adjustment construction process of the underground river oil reservoir flow passage and simultaneously ensure the water injection development effect after construction.
Detailed Description
The present invention will be further described with reference to the following examples. It should be noted that, in the present application, the embodiments and the technical features of the embodiments may be combined with each other without conflict. It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
Example 1
A well group A in a certain area of a tower river oil field is a typical underground river karst oil reservoir well, A, B, C, D, E five wells are shared in the well group, original oil and gas in the area are enriched, the recoverable reserves of the well group are 63.7 ten thousand tons, the utilizable reserves are 147.8 ten thousand tons, the residual recoverable reserves are 22.5 ten thousand tons, and the residual reserves are 106.6 ten thousand tons. At present, the residual reserves between wells are large and the pressure maintaining level is high.
The A well group is a 1-injection 4-well group, and the well group is in the initial development stage:
injecting water into the well A, increasing the oil pressure of the well B by 0.6MPa, stably reducing the water content in the process of exploitation, and showing the response of a tracer;
injecting water into the well A, and lowering the water content of the well C when the well C starts to self-spray, and then raising the oil pressure and changing the oil pressure in a fluctuating way;
injecting water into the well A, and obviously taking effect on the well D;
and injecting water into the well A, enabling the well E to be effective and keep the anhydrous production for a long time, extracting liquid at the second stage of the well E, wherein the water content does not rise directly, but the water is rapidly mixed in the later stage.
Along with the increase of water injection turns, the water injection quantity increases, and 4 affected wells all have failed at present.
In order to improve the water drive development effect and most submerge the residual oil, a water injection well group flow passage adjusting technology research is carried out on the well group.
The flow regulating material is preferably: combining geological data, well drilling and completion data and water injection data of the well A to judge that the reservoir stratum of the near wellbore region of the well A is well developed and has strong absorption capacity on particles and liquid, so that medium-density elastic particles (the density is 1.19 g/cm) with the particle size of 2-7mm are selected in the construction3Flow channel adjusting particles (the water density of the Tahe formation is 1.14 g/cm)3) The flow channel adjusting particles are 20-40: 20-40: 20-40 of asphalt, wood chips and walnut shells), and a guar gum solution is used as an isolation slug.
And (3) determining the concentration of the flow regulating slug: in conjunction with current oil well strings, the open hole volume is 2.5 square, so the maximum particle volume that can be used per slug is 1.75 square. From a safety point of view, the solid particles are used in an amount of 1.4 cubic units per slug. In view of the flow channel adjustment construction experience of the well area in the previous period, the concentration of the slug is designed to be 2% -6%, and therefore, the pellet-containing slug is designed to be 20-70 square.
Injecting a test injection slug: before construction, the pressure of the last round of water injection of the well is 10 MPa. At 3m3And injecting formation water with a shaft volume at a discharge capacity of/min, wherein the water injection pressure is 10 MPa. Selecting medium-density elastic particles with the particle size of 7mm, preparing 20 parts of mixed liquid with the concentration of 6%, and pushing the mixed liquid into the stratum by using a plunger pump. During the injection process, the injection pressure is not obviously increased. Continue to push a wellbore volume of formation water.
Injecting a main body slug: selecting medium-density particles with the particle size of 2mm, sequentially preparing a 2% concentration 70 prescription, a 3% concentration 45 prescription, a 4% concentration 35 prescription and a 5% concentration 28 prescription by using oil field water, and isolating each slug by using 50 prescriptions of guar gum solution; selecting 3mm medium-density particles, preparing a 2% concentration 70 prescription, a 3% concentration 45 prescription, a 4% concentration 35 prescription and a 5% concentration 28 prescription in sequence by using oil field water, and isolating each slug by using 50 prescriptions of guar gum solution. After the 2-3mm particle slug is injected, the injection pressure is increased by 3.1MPa, and the construction purpose is not achieved.
Continuously selecting medium-density particles with the particle size of 4mm, sequentially preparing a 2% concentration 70 prescription, a 3% concentration 45 prescription, a 4% concentration 35 prescription and a 5% concentration 28 prescription by using oil field water, and isolating each slug by using a 50 prescription of guar gum solution; selecting 5mm medium-density particles, preparing a 2% concentration 70 prescription, a 3% concentration 45 prescription, a 4% concentration 35 prescription and a 5% concentration 28 prescription in turn by using oil field water, and isolating each slug by using 50 prescriptions of guar gum solution. After the 2-3mm granular slug is injected, the injection pressure is increased to 3.9MPa, and the construction purpose is not achieved.
And (3) reinforcing slug injection: selecting medium-density particles with the particle size of 6mm, sequentially preparing a plurality of 70-square 2% concentration slugs by using oilfield water, isolating by using 50-square guar gum solution, sequentially injecting the slugs into the well until the construction pressure is increased by more than 5Mpa compared with the initial pressure, stopping injecting the particles, and pushing the particles into the stratum by using 300-square oilfield water.
After the reinforced section plug is injected, the reinforced section plug is injected into the stratum with 37.8 square particles in total, and the maximum discharge capacity is 3m in the injection process3Min, maximum casing pressure of 10.2MPa and maximum pump pressure of 40.7 MPa.
High-pressure water slug injection: and withdrawing the constructed ground equipment, recovering unit pipeline water injection, controlling the water injection pressure to be 15MPa at the maximum, stopping the water injection, and detecting the production conditions of the rest four wells, wherein the water injection amount is half of the water injection amount in the previous period of the well.
The oil pressure of the other four production wells of the well group rises, the water content decreases, the daily liquid yield is greatly increased, and the effect is obvious. Wherein, well C is effected for 242 days, well E is effected for 247 days, well D is effected for 219 days, well B is effected for 214 days, and well group accumulated oil increase 9285t after construction.
It should be noted that, in the invention, the oilfield water is directly used, and the impurities in the oilfield water do not influence the realization of the effect of the slug design method, so that the water resource can be recycled, and the waste is reduced; however, it is not intended to limit the water in the present invention, and those skilled in the art may replace it with other water resources such as tap water.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A design method of a slug for adjustment construction of a flow channel of a subsurface river reservoir is characterized by comprising the following steps:
sequentially injecting a test injection slug, a main body slug, a reinforcing slug and a high-pressure water slug into the well of the underground river oil reservoir;
the test injection slug consists of oil field water, flow passage adjusting particles and oil field water;
the main body slug and the reinforcing slug are both composed of a plurality of groups of first slugs and second slugs which are alternately arranged, the first slugs are composed of oilfield water and flow channel adjusting particles, and the second slugs are composed of polymer solution;
the high-pressure water slug is oilfield water, the amount of the high-pressure water slug is half of the water injection amount of the well in one water injection period before the flow channel adjustment construction, and the injection pressure of the high-pressure water slug is 0-5MPa higher than the water injection pressure of the well before the flow channel adjustment construction.
2. The design method of the underground river reservoir flow channel adjustment construction slug according to claim 1, wherein the amount of the oil field water of the slug injected in two times is the well bore volume, and the amount of the flow channel adjustment particles of the slug injected in two times is defined by a slug quantitative principle.
3. The method for designing the underground river reservoir flow channel adjustment construction slug according to claim 1, wherein the amount of the first slug of the main slug is defined by a slug quantitative principle, and the amount of the second slug of the main slug is 50-80 square.
4. The method for designing a subsurface reservoir flow channel adjustment construction slug according to claim 1, wherein the first slug concentration of the reinforcing slug is determined by the injection pressure of a previous group of slugs, specifically:
if no pressure climbing phenomenon occurs in the construction process, the quantity of a first section of the reinforced section plug is defined by a section plug quantitative principle, and the quantity of a second section of the reinforced section plug is 80-100 square;
and if the injection pressure of the first section plug is obviously higher than that of the previous section plug in the construction process, directly injecting the second section plug, wherein the volume of the second section plug of the reinforced section plug is the volume of the shaft.
5. The method for designing the slug for the adjustment construction of the flow channel of the underground river reservoir according to any one of the claims 2 to 4, wherein the quantitative principle of the slug is as follows: slug amount × slug concentration <0.7 open hole volume.
6. The method of claim 1, wherein the flow adjustment particles are medium density particles, and the density range of the medium density particles is [ rho, rho +0.06g/cm ]3]And rho is the density of formation water.
7. The method of claim 6, wherein the flow conditioning particles are a mixture of asphalt, wood chips, and walnut shells.
8. The method for designing the underground river reservoir flow channel adjustment construction slug according to claim 7, wherein the weight ratio of the asphalt, the wood chips and the walnut shells is 20-40: 20-40: 20-40.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110092339.9A CN112878954A (en) | 2021-01-24 | 2021-01-24 | Design method of adjustment construction slug of underground river oil reservoir flow channel |
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| CN202110092339.9A CN112878954A (en) | 2021-01-24 | 2021-01-24 | Design method of adjustment construction slug of underground river oil reservoir flow channel |
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| CN112878954A true CN112878954A (en) | 2021-06-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114437700A (en) * | 2020-10-20 | 2022-05-06 | 中国石油化工股份有限公司 | Temperature-resistant and salt-resistant flow regulating agent suitable for fracture-cavity oil reservoir and preparation method and application thereof |
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2021
- 2021-01-24 CN CN202110092339.9A patent/CN112878954A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114437700A (en) * | 2020-10-20 | 2022-05-06 | 中国石油化工股份有限公司 | Temperature-resistant and salt-resistant flow regulating agent suitable for fracture-cavity oil reservoir and preparation method and application thereof |
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