CN115828639B - Profile control and profile control combined process scheme adjustment method - Google Patents
Profile control and profile control combined process scheme adjustment method Download PDFInfo
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- CN115828639B CN115828639B CN202310050937.9A CN202310050937A CN115828639B CN 115828639 B CN115828639 B CN 115828639B CN 202310050937 A CN202310050937 A CN 202310050937A CN 115828639 B CN115828639 B CN 115828639B
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Abstract
The invention discloses a profile control and profile control combined process scheme adjustment method, which is characterized in that after an oilfield divides a layer, for a reservoir with extremely large difference, an injection mode of multi-stage profile control and profile control/profile control is mainly adopted for different layers, firstly, an effective displacement pressure difference can be established for a hypertonic layer, secondly, resistance factors of microspheres in deep migration can be increased, small layers in the layer are fully utilized, and the effect of the reservoir is exerted to the greatest extent; the combination of the macroscopic profile control and the deep profile control can effectively block the water flow dominant channel, improve the oil-water fluidity ratio, realize the deep profile control and the deep profile control, greatly improve the water injection development effect and further improve the crude oil recovery ratio.
Description
Technical Field
The invention relates to the field related to oilfield exploitation, in particular to a profile control and profile control combined process scheme adjustment method.
Level of
The driving type of the oil field is related to the selection problem of the development mode, so that the development of the oil field is determined by what force (natural energy or artificial retention pressure) according to the petroleum storage condition; the oil field is driven by water pressure, the energy of the edge high-pressure water is utilized, and the final recovery ratio is the highest and can reach 50-30%; the method comprises the steps of carrying out a first treatment on the surface of the The oil field is driven by air pressure, the crude oil is pushed to flow to the bottom of the well by the energy action of the gas in the form of gas cap, and the final recovery ratio is 40-50%; the dissolved gas drives the oil field, and the gas separated from the oil layer expands to enable crude oil to flow to the bottom of the well, so that the final recovery rate is only 15-30%; the elastic driving oil field is compressed by rock pressure and petroleum, and the oil body is expanded to flow to the bottom of the well by utilizing the force of reducing the pressure of the oil layer; the method comprises the steps of carrying out a first treatment on the surface of the Gravity drives the oil field, and crude oil flows to the bottom of the well under the action of gravity.
When the oil field is affected by fault cutting and sand body distribution, most of the oil fields are fault block oil reservoirs, the oil-bearing intervals are more, and in order to improve the single well productivity, the adopted solution is to develop a partition layer system, and the solution neglects one essential problem: when the layer is extremely poor to a certain extent, under the condition of large extremely poor, due to the interference of a high-permeability layer, enough displacement pressure difference cannot be established, and the low-permeability layer is difficult to use; regardless of how the layers are combined, the single-layer production is low, resulting in a target reservoir with a higher residual oil content; in addition, the long-term flushing of the water body can further aggravate the internal contradiction of the reservoir, and severely restrict the water flooding development effect of the oil field.
Disclosure of Invention
Therefore, in order to solve the above-mentioned shortcomings, the invention provides a profile control and profile control combined process scheme adjusting method.
The invention is realized in such a way, a profile control and profile control combined process scheme adjusting method is constructed, and the method mainly adopts an injection mode of 'multi-stage profile control + profile control/profile control' aiming at different layers, fully utilizes each small layer in the layer, and plays a role to the greatest extent;
the specific process method comprises the following steps:
(1) determining a target reservoir profile according to the current production and suction profile of the target well group and PI value pressure drop curve test data;
(2) simulating the actual reservoir permeability and the degree of heterogeneity based on the physical simulation experimental data;
(3) taking balanced displacement of a heterogeneous reservoir as a starting point, injecting a profile control system in stages, gradually increasing displacement pressure difference, and maximally improving the utilization degree and sweep effect of the reservoir;
(4) establishing the relation between the driving pressure increment and the shunt degree of each layer under the conditions of the permeability level and the extremely poor condition;
(5) aiming at the regulation and control effects of a dispersion type microsphere profile control system with different mass concentrations on reservoirs with different physical properties, establishing resistance to form barrier shunt so as to determine the imbibition level of each small layer, the plugging pressure of different permeation layers and the injection quantity of simulated water;
(6) and determining the profile control concentration according to the on-site actual regulation and control layer permeability, and determining the resistance coefficient required to be established by the actual regulation and control layer according to the to-be-expanded sweep layer permeability level, so as to guide the on-site implementation of injection quantity.
Preferably, the actual control layer is a high permeable layer and the sweep layer is a low permeable layer.
Preferably, the multistage profile control aims at reservoirs which cannot establish enough displacement pressure difference, and the requirements of large pore canal treatment and deep liquid flow diversion technology of medium-low permeable layers are met.
Preferably, as permeability is increased, pressure response is gradually reduced, the profile control system is injected in stages, displacement pressure difference is gradually increased, and the use level of the low permeability layer is increased.
Preferably, for a reservoir with a permeability of 1000mD, the concentration is regulated and controlled by using 1000-4000ppm polymer microspheres, the resistance effect is correspondingly sensitive to the concentration, and the concentration is regulated and controlled according to the resistance coefficient and the step length of 50ppm in the implementation process.
Preferably, for a reservoir with a permeability of 2000mD, 1000-4000ppm of polymer microspheres are adopted for regulation and control, the resistance effect has low sensitivity to the concentration, the concentration is regulated and controlled according to the resistance coefficient in the implementation process, and the concentration is regulated and controlled according to the step length of 100 ppm.
Preferably, gel profile control and full profile control technology are combined and implemented before profile control for reservoirs with permeability of more than 3000 mD.
The invention has the following advantages: the invention provides a profile control and profile control combined process scheme adjusting method by improving the process scheme adjusting method, which has the following improvement compared with the same type of equipment:
the advantages are that: according to the profile control and profile control combined process scheme adjustment method, after an oilfield divides a layer, for a reservoir with extremely high difference, an injection mode of multi-stage profile control and profile control/profile control is mainly adopted for different layers, firstly, effective displacement pressure difference can be established for a hypertonic layer, secondly, resistance factors of microspheres in deep migration can be increased, small layers in the layer are fully utilized, and the effect of the reservoir is exerted to the greatest extent; the combination of the macroscopic profile control and the deep profile control can effectively block the water flow dominant channel, improve the oil-water fluidity ratio, realize the deep profile control and the deep profile control, greatly improve the water injection development effect and further improve the crude oil recovery ratio.
Drawings
FIG. 1 is a graph of pressure increment and split ratio at a range of 5 according to the present invention;
FIG. 2 is a graph of pressure increase and split at a margin of 10 according to the present invention;
FIG. 3 is a graph of pressure increase and split at 15 min according to the present invention;
FIG. 4 is a graph of the split ratio of the high and low permeable layers versus the pressure increment at different extreme differences according to the present invention;
FIG. 5 is a graph of drag factor versus PV number for different microsphere concentrations at a permeability of 1000mD in accordance with the present invention;
FIG. 6 is a graph of drag factor versus PV number for different microsphere concentrations at a permeability of 2000mD in accordance with the present invention;
FIG. 7 is a graph of drag factor versus PV number for different microsphere concentrations at a permeability of 3000mD according to the present invention.
Detailed Description
The following detailed description of the present invention, taken in conjunction with the accompanying drawings, will clearly and fully describe the technical solutions of the embodiments of the present invention, it being evident that the described embodiments are only some, but not all, embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
According to the profile control and profile control combined process scheme adjustment method, a multi-stage profile control and profile control/profile control injection mode is mainly adopted for different layers, small layers in the layers are fully utilized, and the effect is exerted to the greatest extent;
the specific process method comprises the following steps:
(1) determining a target reservoir profile according to the current production and suction profile of the target well group and PI value pressure drop curve test data;
(2) simulating the actual reservoir permeability and the degree of heterogeneity based on the physical simulation experimental data;
(3) taking balanced displacement of a heterogeneous reservoir as a starting point, injecting a profile control system in stages, gradually increasing displacement pressure difference, and maximally improving the utilization degree and sweep effect of the reservoir;
(4) establishing the relation between the driving pressure increment and the shunt degree of each layer under the conditions of the permeability level and the extremely poor condition;
(5) aiming at the regulation and control effects of a dispersion type microsphere profile control system with different mass concentrations on reservoirs with different physical properties, establishing resistance to form barrier shunt so as to determine the imbibition level of each small layer, the plugging pressure of different permeation layers and the injection quantity of simulated water;
(6) and determining the profile control concentration according to the permeability of the actual control layer (high permeable layer) on site, and determining the resistance coefficient required to be established by the actual control layer according to the permeability level of the spreading layer (low permeable layer) to be expanded, so as to guide the on-site implementation of injection quantity.
The multistage profile control aims at reservoirs which cannot establish enough displacement pressure difference, and gives consideration to the technical requirements of large-pore-canal treatment and deep liquid flow steering of a medium-low permeable layer, the profile control focuses on the response to pressure (see fig. 1-4), the profile control focuses on the influence of deep migration (see fig. 5-7), and good oil and water increasing and reducing effects can be achieved by combining the two.
It can be seen from fig. 1-3 that as the permeability is extremely poor, the pressure response gradually decreases, so that the profile control system is injected in stages in order to keep the profile control system uniformly propelled in the high permeability layer, the displacement pressure difference is gradually increased, and the use level of the low permeability layer is increased (see fig. 4).
Permeability change value after polymer microsphere regulation
(1) Aiming at a permeability 1000mD reservoir, the adoption of 1000-4000ppm polymer microspheres has remarkable regulation and control effect, the resistance effect is correspondingly sensitive to the concentration, the concentration is regulated and controlled according to the resistance coefficient in the implementation process, and the concentration is regulated and controlled according to the step length of 50 ppm; (2) for a reservoir with the permeability of 2000mD, the polymer microsphere with the concentration of 1000-4000ppm has good regulation and control effect, the resistance effect has low sensitivity to the corresponding concentration, the concentration is regulated and controlled according to the resistance coefficient in the implementation process, and the concentration is regulated and controlled according to the step length of 100 ppm; (3) aiming at a reservoir with a permeability of 3000mD, the regulation and control effect of polymer microspheres of 2000-5000ppm is common, and the gel profile control is implemented before profile control and full profile control technology is combined.
From fig. 5-7, it can be seen that the concentration of the microspheres is very different for different permeabilities, and the compatibility of the microspheres with 1000-4000PPM and a reservoir with about 1000mD is better, so that effective retention can be generated, and the subsequent water injection can be carried out to the residual oil-rich region; however, for reservoirs with permeability above 3000mD, even after hydration and expansion, the compatibility with a hypertonic layer is still poor, basically water is continuously injected and flows out, and the flow steering capability is limited, so that the resistance factor is low;
therefore, for reservoirs with extremely large differences, gel profile control is performed before profile control, firstly, effective displacement pressure difference can be established for a hypertonic layer, and secondly, resistance factors of microspheres in deep migration can be increased; the combination of the macroscopic profile control and the deep profile control can effectively block the water flow dominant channel, improve the oil-water fluidity ratio, realize the deep profile control and the deep profile control, and greatly improve the water injection development effect.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A profile control and profile control combined process scheme adjusting method is characterized in that: aiming at different layers, mainly adopting an injection mode of 'multi-stage profile control + profile control/profile control', fully utilizing each small layer in the layer, and playing a role to the greatest extent;
the specific process method comprises the following steps:
(1) determining a target reservoir profile according to the current production and suction profile of the target well group and PI value pressure drop curve test data;
(2) simulating the actual reservoir permeability and the degree of heterogeneity based on the physical simulation experimental data;
(3) taking balanced displacement of a heterogeneous reservoir as a starting point, injecting a profile control system in stages, gradually increasing displacement pressure difference, and maximally improving the utilization degree and sweep effect of the reservoir;
(4) establishing the relation between the driving pressure increment and the shunt degree of each layer under the conditions of the permeability level and the extremely poor condition;
(5) aiming at the regulation and control effects of a dispersion type microsphere profile control system with different mass concentrations on reservoirs with different physical properties, establishing resistance to form barrier shunt so as to determine the imbibition level of each small layer, the plugging pressure of different permeation layers and the injection quantity of simulated water;
(6) and determining the profile control concentration according to the on-site actual regulation and control layer permeability, and determining the resistance coefficient required to be established by the actual regulation and control layer according to the to-be-expanded sweep layer permeability level, so as to guide the on-site implementation of injection quantity.
2. The profile control and profile control combined process scheme adjustment method according to claim 1 is characterized in that: the actual control layer is a high permeable layer, and the sweep layer is a low permeable layer.
3. The profile control and profile control combined process scheme adjustment method according to claim 1 is characterized in that: the multistage profile control aims at reservoirs which cannot establish enough displacement pressure difference, and meets the technical requirements of large pore canal treatment and deep liquid flow diversion of medium-low permeable layers.
4. The profile control and profile control combined process scheme adjustment method according to claim 1 is characterized in that: with the extremely poor permeability, the pressure response is gradually reduced, the displacement pressure difference is gradually increased by injecting the profile control system in stages, and the use degree of the low permeable layer is improved.
5. The method for adjusting the profile control and profile control combined process scheme according to claim 4 is characterized in that: for a permeability 1000mD reservoir, the concentration is regulated and controlled by adopting 1000-4000ppm polymer microspheres, and the concentration is regulated and controlled according to the resistance coefficient and the step length of 50ppm in the implementation process.
6. The method for adjusting the profile control and profile control combined process scheme according to claim 4 is characterized in that: for a reservoir with the permeability of 2000mD, the concentration is regulated and controlled by adopting 1000-4000ppm polymer microspheres, and the concentration is regulated and controlled according to the resistance coefficient and the step length of 100ppm in the implementation process.
7. The method for adjusting the profile control and profile control combined process scheme according to claim 4 is characterized in that: aiming at a reservoir with a permeability of 3000mD, 2000-5000ppm polymer microspheres are adopted for regulation and control, and gel profile control and full profile control technology are combined and implemented before profile control and flooding.
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Citations (3)
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| CN109765143A (en) * | 2019-03-01 | 2019-05-17 | 延安中杰高新工贸有限公司 | A kind of evaluation method and device being classified profile control and water plugging effect |
| CN111472736A (en) * | 2020-04-22 | 2020-07-31 | 中海石油（中国）有限公司天津分公司 | Offshore oilfield combined profile control and flooding optimization design method and device |
| CN114910391A (en) * | 2022-07-18 | 2022-08-16 | 西安石油大学 | Experimental device and method for evaluating multistage profile control performance of microbial cement in fractured reservoir |
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- 2023-02-02 CN CN202310050937.9A patent/CN115828639B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109765143A (en) * | 2019-03-01 | 2019-05-17 | 延安中杰高新工贸有限公司 | A kind of evaluation method and device being classified profile control and water plugging effect |
| CN111472736A (en) * | 2020-04-22 | 2020-07-31 | 中海石油（中国）有限公司天津分公司 | Offshore oilfield combined profile control and flooding optimization design method and device |
| CN114910391A (en) * | 2022-07-18 | 2022-08-16 | 西安石油大学 | Experimental device and method for evaluating multistage profile control performance of microbial cement in fractured reservoir |
Non-Patent Citations (3)
| Title |
|---|
| Effect of profile-control oil-displacement agent on increasing oil recovery and its mechanism;Weijia Cao;Fuel;1151–1160 * |
| 多级调剖调驱技术效果及剩余油分布;梁守成;***;吕鑫;ZHOU Yanxia;曹伟佳;卢祥国;;大庆石油地质与开发(第06期);108-112页 * |
| 扩大波及体积与流度控制组合技术研究与应用;张云宝 等;当代化工;567-571页 * |
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