CN114109327B - Oil-water well linkage profile control method - Google Patents
Oil-water well linkage profile control method Download PDFInfo
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- CN114109327B CN114109327B CN202010876807.7A CN202010876807A CN114109327B CN 114109327 B CN114109327 B CN 114109327B CN 202010876807 A CN202010876807 A CN 202010876807A CN 114109327 B CN114109327 B CN 114109327B
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- 239000003129 oil well Substances 0.000 claims abstract description 68
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Classifications
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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
- 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
-
- 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
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
Abstract
The invention provides an oil-water well linkage profile control method, which comprises the following steps: selecting a target well and a target oil well communicated with the target well as a profile control well group; and performing profile control operation on the target well, and simultaneously performing oil well linkage operation on the target well, wherein the oil well linkage operation comprises one or more of water plugging operation, oil extraction operation, reservoir reconstruction operation and sand prevention operation. According to the invention, by implementing the oil-water well linkage comprehensive treatment technology for the oil-water wells with good reservoir correspondence, oil-water well measures are implemented simultaneously, the oil-water wells are produced in a coordinated manner, the problem that residual oil between the oil-water wells cannot be effectively used is solved, the water absorption profile of the water wells and the liquid production profile of the oil wells are effectively improved, the water injection wave area is increased, and the recovery ratio of the oil wells is improved.
Description
Technical Field
The invention relates to the technical field of oil extraction engineering, in particular to an oil-water well linkage profile control method.
Background
Along with the development of the oil field entering the middle and later stages, the water injection ineffective circulation is easy to form in the long-term water injection development between the oil-water wells with better connectivity, and the comprehensive water content of the oil well is high. The water well profile control process as tertiary oil recovery technology plays a vital role in oil field oil increasing and production stabilizing. However, as the profile control of the water well is continued to be advanced, the water well with better stable yield and yield increasing effects is subjected to multiple profile control, whether the near-end profile control of the water well or the deep profile control of the water well is implemented, the improvement degree of the water absorption profile is gradually reduced, and the profile control effect is continuously deteriorated.
Disclosure of Invention
The invention aims to provide an oil-water well linkage profile control method, which aims to solve the problem that the profile control effect is continuously deteriorated due to the fact that the improvement degree of a single well profile control on a water absorption profile is gradually reduced.
In order to achieve the above purpose, the invention provides an oil-water well linkage profile control method, which comprises the following steps: selecting a target well and a target oil well communicated with the target well as a profile control well group; and performing profile control operation on the target water well, and simultaneously performing oil well linkage operation on the target oil well, wherein the oil well linkage operation comprises one or more of water shutoff operation, oil extraction operation, reservoir reconstruction operation and sand prevention operation.
The oil-water well linkage profile control method as claimed in claim, wherein the step of performing profile control operation on the target well comprises the steps of: selecting a profile control pipe column and determining a profile control process; the profile control pipe column is put into the target water well; and performing profile control operation on the target water well according to a predetermined profile control process.
The oil-water well linkage profile control method as claimed in, wherein the selective profile control pipe column comprises: selecting a profile control pipe column according to the distribution condition of the high-permeability oil layer in the oil reservoir to be profile controlled, and selecting a general profile control pipe column when the distribution of the high-permeability oil layer in the oil reservoir to be profile controlled is single; when a high-permeability oil layer in an oil reservoir to be profile-controlled is distributed in an upper layer system and a lower layer system with different water absorption capacities, selecting an oil jacket split injection profile-control pipe column; and when the high-permeability oil layer in the oil reservoir to be profile-controlled is distributed in a plurality of layers with different water absorption capacities, selecting the multi-stage injection profile-controlled tubular column.
The oil-water well linkage profile control method as set forth in claim, wherein the profile control pipe column is an oil jacket split injection profile control pipe column, the oil jacket split injection profile control pipe column comprises an oil pipe, two water distributors arranged on the oil pipe, and a packer arranged on the oil pipe and located between the two water distributors, wherein the two water distributors respectively correspond to two oil layers.
The oil-water well linkage profile control method as set forth in claim, wherein the profile control pipe column is a multi-stage split injection profile control pipe column, the multi-stage split injection profile control pipe column comprises an oil pipe, a plurality of water distributors arranged on the oil pipe, and a plurality of packers arranged on the oil pipe, wherein the packers and the water distributors are alternately arranged from top to bottom, and the water distributors respectively correspond to a plurality of oil layers.
The oil-water well linkage profile control method as set forth in claim, wherein the profile control process is a segment rotation profile control process for performing profile control on a plurality of oil layers with different permeabilities of an oil reservoir to be profile controlled, the segment rotation profile control process comprising: determining injection quantity and injection concentration of profile control agents required by each of a plurality of oil layers; preparing profile control agents for a plurality of oil layers according to the injection quantity and the injection concentration of the profile control agents, which are preset; and injecting the profile control agent into a plurality of oil layers by adopting a mode of injecting the profile control agent and injecting water alternately until the injection quantity of the profile control agent reaches a preset injection quantity.
The oil-water well linkage profile control method as set forth in claim, wherein the profile control process is an intermittent slug profile control process for profile control of an oil layer to be profile controlled having a plurality of areas of different permeability, the intermittent slug profile control process comprising: determining a plurality of injection concentrations of a profile control agent required by an oil layer to be profile controlled and injection amounts corresponding to the injection concentrations; preparing profile control agent according to the predetermined injection concentration and injection quantity; according to the sequence of the injection concentration of the profile control agent from high to low, the profile control is carried out on the oil layer to be subjected to profile control for a plurality of rounds, and the step of profile control for each round comprises the following steps: firstly injecting a profile control agent, then closing the well, condensing, and then injecting water.
The oil-water well linkage profile control method as set forth in claim, wherein the profile control process is a multi-segment plug compound profile control process, the multi-segment plug compound profile control process comprising a segment rotation profile control process and an intermittent segment plug profile control process; the sectional alternate profile control process comprises the following steps: determining injection quantity and injection concentration of profile control agent required by each of a plurality of oil layers; preparing profile control agents for a plurality of oil layers according to the injection quantity and the injection concentration of the profile control agents, which are preset; injecting profile control agents with corresponding concentrations into a plurality of oil layers respectively by adopting a mode of injecting the profile control agents and injecting water alternately until the injection quantity of the profile control agents reaches a preset injection quantity; the intermittent slug profile control process comprises the following steps: determining injection concentration of various profile control agents required by an oil layer to be profile controlled and injection quantity corresponding to each injection concentration; preparing profile control agent according to the predetermined injection concentration and injection quantity; according to the sequence of the injection concentration of the profile control agent from high to low, the profile control is carried out on the oil layer to be subjected to profile control for a plurality of rounds, and the step of profile control for each round comprises the following steps: firstly injecting a profile control agent, then closing the well, condensing, and then injecting water.
The oil-water well linkage profile control method as claimed in, wherein the step of simultaneously performing oil well linkage operation on the target oil well comprises the following steps: obtaining various production indexes of each target oil well, wherein the production indexes are obtained from each target oil well during early exploitation, and the production indexes comprise water outlet layers, sand outlet amount, liquid production amount and water content; determining the construction direction of each target oil well according to various production indexes of each target oil well, wherein the construction direction is water shutoff, liquid extraction, reservoir reconstruction or sand prevention; and performing profile control operation on the target water well, and simultaneously performing water shutoff operation, oil extraction operation, reservoir reconstruction operation or sand prevention operation on each target oil well according to the predetermined construction direction.
The oil-water well linkage profile control method as set forth in claim, wherein said water shutoff operation comprises a mechanical water shutoff operation, an intelligent water shutoff finding operation, and a profile control water shutoff operation, and said reservoir modification operation comprises acidizing, fracturing, and perforating.
The oil-water well linkage profile control method has the characteristics and advantages that:
according to the invention, by implementing the oil-water well linkage comprehensive treatment technology for the oil-water wells with good reservoir correspondence, oil-water well measures are implemented simultaneously, the oil-water wells are produced in a coordinated manner, the problem that residual oil between the oil-water wells cannot be effectively used is solved, the water absorption profile of the water wells and the liquid production profile of the oil wells are effectively improved, the water injection wave area is increased, and the recovery ratio of the oil wells is improved.
Drawings
The following drawings are only for purposes of illustration and explanation of the present invention and are not intended to limit the scope of the invention. Wherein:
FIG. 1 is a schematic illustration of a profile control well group to which the oil-water well linkage profile control method of the present invention is applied;
FIG. 2 is a schematic illustration of a general profile control string;
FIG. 3 is a schematic illustration of an oil jacket split injection profile control string;
FIG. 4 is a schematic illustration of a multi-stage split injection profile control string;
FIG. 5 is a flow chart of the oil-water well linkage profile control method of the present invention;
FIG. 6 is a flow chart of an embodiment of the present invention for performing profile control operations on a target well;
FIG. 7 is a flow chart of one embodiment of the present invention for performing well-linked operations on a target well.
Reference numerals for main elements:
1. a target well; 2. plugging the water-layer production well; 3. a liquid extracting well; 4. reservoir reforming wells; 5. sand control well;
6. an oil pump; 7. plugging the water packer of oil layer; 8. a large pump of deep extract; 9. fracturing a tubular column;
10. a rotary sand control pump; 11. sand control screen pipe; 12. an oil pipe; 13. a packer; 14. a water distributor;
100. an oil layer; 200. a technical sleeve; 300. a surface sleeve.
Detailed Description
For a clearer understanding of technical features, objects, and effects of the present invention, a specific embodiment of the present invention will be described with reference to the accompanying drawings.
Aiming at the problem that the profile control effect of a single well is not ideal, the inventor changes the technical thought, takes a profile control well and a profile control well group formed by a profile control well and a corresponding oil well as an integral target, and provides an oil-water well linkage profile control method, as shown in fig. 5, which comprises the following steps:
step S1: selecting a target well and a target oil well communicated with the target well as a profile control well group;
step S2: and performing profile control operation on the target well, and simultaneously performing oil well linkage operation on the target oil well, wherein the oil well linkage operation comprises one or more of water shutoff operation, oil extraction operation, reservoir transformation operation and sand prevention operation, such as two, three or four of the operations, so as to realize oil-water well linkage composite profile control and yield increase.
According to the invention, by implementing the oil-water well linkage comprehensive treatment technology for the oil-water wells with good reservoir correspondence, oil-water well measures are implemented simultaneously, the oil-water wells are produced in a coordinated manner, the problem that residual oil between the oil-water wells cannot be effectively used is solved, the water absorption profile of the water wells and the liquid production profile of the oil wells are effectively improved, the water injection wave area is increased, and the recovery ratio of the oil wells is improved.
As shown in fig. 1, for example, the profile control well group includes one target well 1 and four target wells, which are communicated through an oil layer, and the four target wells are respectively water shutoff, liquid extraction, reservoir reformation and sand prevention in the construction direction, that is, the four target wells are respectively a water shutoff layered production well 2, a liquid extraction well 3, a reservoir reformation well 4 and a sand prevention well 5, and while the profile control operation is performed on the target well, the water shutoff operation, the oil extraction operation, the reservoir reformation operation and the sand prevention operation are respectively performed on the four target wells.
Further, in step S1, a sandstone reservoir with better development of the reservoir is selected, the correspondence between the sandstone reservoir and the reservoir layers of the surrounding oil well is better, or the tracer interpretation result is the main water driving direction effect well, the complex conditions such as no sleeve change, down-hole junk, serious sand production and the like in the well are avoided, and the water injection rate is 5m 3 And (3) taking the water well with water injection pressure not exceeding 15MPa as a target water well within/h.
Further, in step S1, according to the correspondence between the sandstone reservoir layers and the sandstone groups, the wells corresponding to each layer of the target well are selected as target wells.
As shown in fig. 6, in one embodiment, in step S2, a profile control operation is performed on the target water well, including:
step S211: according to the profile control construction purpose and requirements, selecting a profile control tubular column, and determining a profile control process;
step S212: a profile control pipe column is arranged in a target water well;
step S213: and performing profile control operation on the target water well according to a predetermined profile control process.
In one embodiment, a method of selecting a profile control tubular string includes:
a profile control pipe column is selected according to the distribution condition of the high-permeability oil layer in the oil reservoir, and when the distribution of the high-permeability oil layer in the oil reservoir is single, for example, the high-permeability oil layer is intensively distributed in one oil layer system, a general profile control pipe column is selected; when a high-permeability oil layer in an oil reservoir is distributed in an upper layer system and a lower layer system with different water absorption capacities, selecting an oil jacket split injection profile control tubular column; when a high permeability reservoir in the reservoir is distributed in multiple layers with different water absorption capacities, a multi-stage injection profile control column is selected.
As shown in fig. 2, further, the general profile control pipe column includes an oil pipe 12 and a packer 13 disposed on the oil pipe 12, after the general profile control pipe column is put into the well, the packer 13 is located above the oil layer 100, and a flare is provided at the bottom of the oil pipe 12, and is an outlet of the profile control agent.
The general profile control pipe column is suitable for target wells with less main oil layer and relatively single high-permeability oil layer distribution. For example, a conventional water injection pipe column adopts a phi 73mm flat oil pipe, and a packer avoids the position of a casing collar, so that the main purpose is to reduce the influence of large pressure fluctuation on the pipe column and a wellhead during profile control and improve the construction safety; the depth of the general profile control pipe column is not more than 1800m, because the burial depth of the main oil layer is 1625 m-2350 m, the burial depth of the high-permeability oil layer is 1800 m-2000 m, and the general profile control pipe column is not more than 1800m, the profile control agent can effectively block the high-permeability layer.
As shown in fig. 3, the oil jacket split injection profile control pipe column further comprises an oil pipe 12, two water distributors 14 arranged on the oil pipe 12, and a packer 13 arranged on the oil pipe 12 and positioned between the two water distributors 14, wherein the two water distributors 14 respectively correspond to two oil reservoirs 100, a water nozzle is arranged on each water distributor 14, the packer 13 is positioned between the two oil reservoirs 100, a part of profile control agent injected from the oil pipe 12 is injected into a lower oil reservoir layer system through the water distributor 14 below, and the other part of profile control agent is injected into an oil jacket annular space through the water distributor 14 above and then is injected into an upper oil reservoir layer system from the oil jacket annular space.
The oil jacket separate injection profile control pipe column is suitable for a target well with large difference of water absorption capacities of an upper layer and a lower layer of a water injection layer section, high permeable layers exist in the upper layer and the lower layer, and the water absorption profile needs to be adjusted and improved. The oil jacket separate injection profile control pipe column generally adopts phi 73mm flat oil pipe and Y521 long rubber sleeve packer, the long rubber sleeve packer adopts high temperature resistant and long rubber sleeve material, the packer is positioned at the position of about 2000m with thicker oil layer interlayer, and can play the roles of better long-term temperature resistance, pressure resistance, upper and lower sealing layers, wherein the upper and lower layers are the upper and lower layers for generally dividing the oil reservoir according to the geological condition of the oil reservoir, the dividing position is about 2000m, and the general running depth of the oil jacket packer is about 2000 m.
Further, the oil pipe 12 is provided with an anchor which is arranged above the two water distributors 14.
As shown in fig. 4, the multi-stage injection profile control pipe column further comprises an oil pipe 12, a plurality of water distributors 14 arranged on the oil pipe 12, and a plurality of packers 13 arranged on the oil pipe 12, wherein the plurality of packers 13 and the plurality of water distributors 14 are alternately arranged from top to bottom, the plurality of water distributors 14 respectively correspond to the plurality of oil layers 100, a water nozzle is arranged on each water distributor 14, and the profile control agent injected from the oil pipe 12 is respectively injected into each oil layer 100 through the plurality of water distributors 14.
The multi-stage separate injection profile control pipe column is suitable for a target well with extremely poor permeability of a water injection layer section, a plurality of high permeable layers exist, the multi-stage separate injection profile control pipe column is complex corresponding to an oil well, and the water absorption profile of the target well needs to be finely adjusted. The oil pipe of the multi-stage split injection profile control pipe column generally adopts a phi 73mm flat oil pipe, and the water nozzle adopts a casting-fishing type flow classification water nozzle. Considering that the extremely poor permeability, the water absorption capacity of a water injection interval and the injection pressure level difference are large, the depth of the interval is too large, and the packer is not tightly set or is not tightly unset, and the depth of each stage of the multi-stage injection well interval is generally not more than 100m.
Furthermore, the profile control agent used for the profile control operation of the target water well is a weak gel system, for example, a composite ion polyacrylamide and phenolic resin crosslinking agent, and the formula concentration of the system is selected according to the average permeability of an oil layer, and meanwhile, the molecular weight, the hydrolysis degree and the like of the composite ion polyacrylamide are required to be considered. When the average permeability of the oil layer is 400-1000 md, compound ion polyacrylamide with the concentration of 0.2-0.5% (the molecular weight of the compound ion polypropylene is 2000 ten thousand, the degree of hydrolysis) and phenolic resin cross-linking agent with the concentration of 0.6-0.8% are compounded, and the glue is stabilized to be generally 4000 mpa.s-11000 mpa.s.
Further, the profile control apparatus for performing profile control operation on a target well includes: a liquid preparation and stirring integrated tank, an injection increasing pump, a flow pipeline and the like. The profile control equipment is in the prior art, and the specific structure of the profile control equipment is not repeated.
In a first embodiment, the profile control process used for performing profile control operation on the target water well is a sectional rotation profile control process, the sectional rotation profile control process is used for performing profile control on a plurality of oil layers with different permeabilities of an oil reservoir to be subjected to profile control, that is, mainly solving interlayer contradiction, for example, the plurality of oil layers are respectively a high-permeability oil layer, a medium-permeability oil layer and a low-permeability oil layer, the permeabilities of the high-permeability oil layer are 800 md-1000 md, the permeabilities of the medium-permeability oil layer are 400 md-800 md, and the permeabilities of the low-permeability oil layer are less than 400md, and the sectional rotation profile control process comprises:
step S21311: determining injection quantity and injection concentration of the profile control agent required by each of a plurality of oil layers, wherein the permeability of the oil layer is in direct proportion to the injection concentration of the profile control agent, namely the higher the permeability of the oil layer is, the higher the concentration of the profile control agent is required;
step S21312: preparing profile control agents for a plurality of oil layers according to the injection quantity and the injection concentration of the profile control agents, which are preset;
step S21313: and injecting the profile control agent into a plurality of oil layers by adopting a mode of injecting the profile control agent and injecting water alternately until the injection quantity of the profile control agent reaches a preset injection quantity.
The sectional rotation profile control process in the embodiment aims at well groups of long well section joint injection production, mainly solves the interlayer contradiction, achieves the purposes of blocking a high-permeability oil layer and starting a middle-low-permeability oil layer, improves the water absorption profile of a water well, can realize the purpose of injection profile control of a construction layer section and injection of a non-construction layer section, avoids interlayer interference, and ensures the injection time rate of the non-construction layer section.
The sectional alternate profile control process of the embodiment can adopt an oil jacket split injection profile control pipe column and a multi-stage split injection profile control pipe column.
Further, the method for determining the injection amount of the profile control agent required by each of the plurality of oil layers comprises the following steps:
step a: acquiring distribution ratio values of a plurality of oil layers in an oil reservoir to be profile adjusted;
step b: determining the total injection amount of the profile control agent required by the oil reservoir to be profile controlled, wherein the total injection amount is called a first preset total injection amount; the specific determination method of the total injection amount of the profile control agent is the prior art, so the description is omitted;
step c: and determining the injection quantity of the profile control agent required by each of the oil layers according to the distribution ratio of the oil layers in the oil reservoir to be subjected to profile control, wherein the ratio of the injection quantity of each oil layer in the first preset total injection quantity is in direct proportion to the distribution ratio of the oil layer in the oil reservoir to be subjected to profile control.
In a second specific embodiment, the profile control process used for performing profile control operation on the target water well is an intermittent slug profile control process, where the intermittent slug profile control process is used for performing profile control on an oil layer to be profile controlled having a plurality of areas with different permeabilities, that is, mainly solving intra-layer contradiction, for example, the plurality of areas with different permeabilities are respectively a high-permeability area, a medium-permeability area and a low-permeability area, and the intermittent slug profile control process includes:
step S21321: determining a plurality of injection concentrations of a profile control agent required by an oil layer to be profile controlled and injection amounts corresponding to the injection concentrations;
step S21322: preparing profile control agent according to the predetermined injection concentration and injection quantity;
step S21323: according to the sequence of the injection concentration of the profile control agent from high to low, the profile control is carried out on the oil layer to be subjected to profile control for a plurality of rounds, each round of profile control adopts an intermittent injection mode, namely, the step of profile control for each round comprises the following steps: firstly injecting a profile control agent, then closing the well, condensing, and then injecting water. Wherein the profile control agent injected in each round may be referred to as a slug.
The intermittent slug profile control process in the embodiment mainly solves the contradiction in a large thick layer, intermittently injects, prolongs the interval time of each slug, reduces the breakthrough of water injection in high and medium permeation areas in the oil layer to be profile controlled, changes the water flooding direction in the layer, forces the water injection to turn to the medium and low permeation areas, and promotes the medicament to migrate to the deep part by means of water flooding, thereby improving the utilization degree of residual oil.
The intermittent slug profile control process in the embodiment can adopt a general profile control pipe column and an oil jacket separate injection profile control pipe column.
Further, the method for determining the injection concentration of the profile control agent required by the oil layer to be profile controlled and the injection quantity corresponding to each injection concentration comprises the following steps:
step a: obtaining technical parameters of an oil layer to be profile-adjusted, wherein the technical parameters comprise permeability, water injection pressure, kick-in speed and water kick-in direction coefficients, and calculating the total injection quantity (called second preset total injection quantity) and various injection concentrations of a profile-adjusting agent required by the oil layer to be profile-adjusted according to the technical parameters, wherein a specific calculation method is the prior art, so that the description is omitted;
step b: dividing the second preset total injection amount into a plurality of slugs, wherein the slugs respectively correspond to a plurality of injection concentrations, i.e. the slugs respectively correspond to the injection amounts of the injection concentrations.
In a third specific embodiment, the profile control process used for implementing profile control operation on the target water well is a multi-section plug composite profile control process, the multi-section plug composite profile control process mainly solves the comprehensive contradiction of contradiction and interweaving between reservoir layers, layers and planes, a single contradiction is not outstanding, the multi-section plug composite profile control process comprises a sectional alternate profile control process and an intermittent section plug profile control process, and the multi-section plug composite profile control process is a combined process, wherein the steps of the sectional alternate profile control process are the same as those of the first embodiment, and the steps of the intermittent section plug profile control process are the same as those of the second embodiment. In this embodiment, the sectional alternate profile control process may be performed first, and then the intermittent slug profile control process may be performed, or the intermittent slug profile control process may be performed first, and then the sectional alternate profile control process may be performed, as required.
By adopting the multi-section plug compound profile control process of the embodiment, the profile control agent is injected at low discharge capacity and low pressure, for example, the discharge capacity is 1 square/hour-1.5 square/hour, and the injection pressure is 8MPa, so that the plugging agent selectively enters the stratum, and the layer-by-layer plugging of the high permeable layer and the medium permeable layer is realized.
The multi-section plug compound profile control process in the embodiment mainly solves the comprehensive contradiction of contradiction and interweaving between layers, in-layer and plane, improves the water driving degree and improves the water absorption profile of an oil layer.
The multi-section plug composite profile control process in the embodiment can adopt a general profile control pipe column and an oil jacket split injection profile control pipe column.
As shown in fig. 7, in one embodiment, in step S2, the simultaneously performing the well-linked operation on the target well includes:
step S221: obtaining various production indexes of each target oil well, wherein the production indexes are obtained from each target oil well during early exploitation, and the production indexes comprise water outlet layers, sand outlet amount, liquid production amount and water content;
step S222: determining the construction direction of each target oil well according to various production indexes of each target oil well, wherein the construction direction is water shutoff, liquid extraction, reservoir reconstruction or sand prevention;
step S223: and (3) performing profile control operation on the target well, and simultaneously performing water shutoff operation, oil extraction operation, reservoir reconstruction operation or sand prevention operation on each target well according to a predetermined construction direction.
Further, the water plugging operation is implemented on the target oil well corresponding to the water burst layer or the water string layer, and the water plugging operation comprises mechanical water plugging operation, intelligent water finding and plugging operation and profile control water plugging operation.
Specifically, a mechanical water shutoff tool is put into a target oil well with a clear water outlet layer to implement mechanical water shutoff operation, and the types of mechanical water shutoff processes mainly comprise four types of upper and lower seal production, upper seal production, middle seal production and two middle seal production; the method comprises the steps of (1) setting an intelligent water plugging tool into a target oil well with an undefined water outlet layer, and implementing intelligent water plugging finding operation; and injecting water shutoff agent into a target oil well with more water outlet layers and strong non-uniformity of a liquid production section, and implementing profile control and water shutoff operation. The structures and corresponding construction processes of the mechanical water shutoff tool and the intelligent water shutoff tool are the prior art, and the construction process of profile control and water shutoff is the prior art, so that the description is omitted.
Further, the oil extraction operation is performed on the target oil well with the water content lower than the preset normal water content and the liquid supply amount not lower than the preset normal liquid supply amount, for example, the oil extraction operation is a large pump liquid extraction. For example, the preset normal water content is 90% and the preset normal liquid supply amount is 30t/d.
Specifically, the water content is reduced by about 5%, the liquid supply is better, the liquid level rises or is stable, the oil well with the general sinking degree not lower than 200 meters is lifted out of the original well string, and the factors such as the liquid supply capacity, the sinking degree, the pumping unit, the string load and the like are comprehensively considered to be put into the large pump liquid extraction string, so that the productivity of the oil well is improved. The structure of the large pump liquid extraction pipe column and the corresponding construction process are in the prior art, so that the description is omitted.
Further, reservoir reformation operations including acidizing, fracturing and perforating are performed on the target well having a fluid supply less than the predetermined normal fluid supply.
Specifically, the oil well with low seepage capability and insufficient liquid supply corresponding to the near-well bottom zone pollution is lifted out of the original well string, and is put into an acidizing or fracturing string to implement reservoir reformation measures such as acidizing or fracturing, and after implementation, the oil well is put into production. And (3) for the target oil well with the water well corresponding to the unopened oil layer position or the target oil well with no obvious effect after opening, starting the original well string, putting into a perforating string, starting the string after perforation, and putting into a production string for production. The structures of the acidizing string, the fracturing string and the perforating string and the corresponding construction process are all of the prior art, so that the description is omitted.
Further, sand control operation is carried out on the target oil well with sand output larger than the preset normal sand output. For example, the preset normal sand output is 30d/m.
Specifically, according to the sand outlet condition, sand is prevented by a sand prevention tool or sand prevention production pipe column is put into production, and the adopted sand prevention tool is one or a plurality of combinations of the existing fracturing sand prevention pipe column, a sand prevention screen pipe, a rotary sand prevention pump and a rotational flow sand remover. The structure of the sand control tool and the corresponding construction process are the prior art, so that the description is omitted.
As shown in fig. 1, for example, the profile control well group includes one target well 1 and four target wells, the target well 1 and the four target wells are communicated through an oil layer 100, according to various production indexes of each target well, the construction directions of the four target wells are determined to be water shutoff, fluid lifting, reservoir modification and sand prevention respectively, for convenience of description, according to the construction directions, the four target wells are respectively referred to as a water shutoff and layer production well 2, a fluid lifting well 3, a reservoir modification well 4 and a sand prevention well 5, the equipment in the water shutoff and layer production well 2 includes an oil pump 6 and an oil layer water shutoff packer 7, the equipment in the fluid lifting well 3 includes a deep extract pump 8, the equipment in the reservoir modification well 4 is an acidizing string, a perforating string or a fracturing string 9, the equipment in the sand prevention well 5 includes a rotary sand control pump 10 and a sand control screen 11, and the equipment in the target well 1 is a cage system profile control string, an oil jacket split control string or a multi-stage split control profile control well, wherein the equipment in the water shutoff and oil layer production well 2 includes a water shutoff packer 7, a deep extract pump 8, an acidizing string, a fracturing string, a rotary control string 9, a rotary sand control string 10 and a sand control screen 11 are not in the prior art.
The following describes the construction steps and application effects of the oil-water well linkage profile control method according to an embodiment.
Selecting a target water well and five target oil wells from a well block to form a profile control well group, and respectively determining the construction directions of the five target oil wells as intelligent water finding and blocking, large pump liquid extracting, reservoir reconstruction, water blocking layering and combined sand prevention according to the production indexes of the five target oil wells, wherein the specific construction steps are as follows:
(1) Preparation for construction
(1) Installation of profile control equipment: the liquid preparation and stirring integrated tank is connected with a pipeline of an injection pump, the injection pump is connected with a wellhead, and matched tools such as a pressure gauge, a water discharge control valve and the like are installed at the same time;
(2) opening a water discharging valve of the liquid preparation tank, sucking the composite ion polyacrylamide and the phenolic resin cross-linking agent (the system proportioning requirement is required to be carried out according to the scheme) into the tank by utilizing a venturi tube mixer, stirring and mixing uniformly, and stirring and curing for 2 hours at a low speed;
(3) corresponding to the related underground operation of the oil well, the production string of the original well is started, and is replaced by the production string designed according to the scheme, wherein the production string comprises sucker rods, oil pumps, oil pipes, underground tools such as hot wires, packers and the like.
(2) Linkage profile control construction of oil-water well
(1) Slowly opening a water well production valve, starting an injection pump, pumping cured profile control agent, and generally injecting the profile control agent into the water well to about 3000 sides; simultaneously, respectively implementing intelligent water finding and plugging operation, large pump liquid extracting operation, reservoir reconstruction operation, water plugging layering operation and combined sand prevention operation for five target oil wells according to a predetermined construction direction;
(2) after the target oil well is normally started and put into production, testing the water content change of the target oil well every 2-3 days for a common oil well, and testing the water content change of a key oil well every day;
(3) counting the pressure change of the target water well every day, and timely making tracking adjustment of the profile control scheme; the daily statistics of the target oil well yield change, the main parameters comprise liquid production, water content, oil production, working fluid level, oil well production conditions and the like, so that the statistical analysis of the effect is performed. The average daily oil increase of the profile control well group reaches 6 tons through statistics.
The foregoing is illustrative of the present invention and is not to be construed as limiting the scope of the invention. Any equivalent changes and modifications can be made by those skilled in the art without departing from the spirit and principles of this invention, and are intended to be within the scope of this invention. It should be noted that, the components of the present invention are not limited to the above-mentioned overall application, and each technical feature described in the specification of the present invention may be selected to be used singly or in combination according to actual needs, so that other combinations and specific applications related to the present invention are naturally covered by the present invention.
Claims (9)
1. The oil-water well linkage profile control method is characterized by comprising the following steps of:
selecting a target well and a target oil well communicated with the target well as a profile control well group;
performing profile control operation on the target well, and simultaneously performing oil well linkage operation on the target oil well, wherein the oil well linkage operation comprises one or more of water shutoff operation, oil extraction operation, reservoir reconstruction operation and sand prevention operation;
wherein the simultaneously performing well-linked operations on the target well comprises:
obtaining various production indexes of each target oil well, wherein the production indexes are obtained from each target oil well during early exploitation, and the production indexes comprise water outlet layers, sand outlet amount, liquid production amount and water content;
determining the construction direction of each target oil well according to various production indexes of each target oil well, wherein the construction direction is water shutoff, liquid extraction, reservoir reconstruction or sand prevention;
while the profile control operation is carried out on the target water well, water shutoff operation, oil extraction operation, reservoir reconstruction operation or sand prevention operation is carried out on each target oil well according to the predetermined construction direction, and the method comprises the following steps:
carrying out water plugging operation on a target oil well corresponding to the water bump layer or the water string layer;
oil extraction operation is carried out on a target oil well with the water content lower than the preset normal water content and the liquid supply amount not lower than the preset normal liquid supply amount;
reservoir reformation operation is carried out on the target oil well with the liquid supply amount lower than the preset normal liquid supply amount;
and carrying out sand prevention operation on the target oil well with sand output larger than the preset normal sand output.
2. The oil-water well linkage profile control method as set forth in claim 1, wherein said performing profile control operation on said target well comprises:
selecting a profile control pipe column and determining a profile control process;
the profile control pipe column is put into the target water well;
and performing profile control operation on the target water well according to a predetermined profile control process.
3. The oil-water well linkage profile control method as claimed in claim 2, wherein the selecting profile control pipe column comprises:
selecting a profile control pipe column according to the distribution condition of the high-permeability oil layer in the oil reservoir to be profile controlled, and selecting a general profile control pipe column when the distribution of the high-permeability oil layer in the oil reservoir to be profile controlled is single; when a high-permeability oil layer in an oil reservoir to be profile-controlled is distributed in an upper layer system and a lower layer system with different water absorption capacities, selecting an oil jacket split injection profile-control pipe column; and when the high-permeability oil layer in the oil reservoir to be profile-controlled is distributed in a plurality of layers with different water absorption capacities, selecting the multi-stage injection profile-controlled tubular column.
4. The oil-water well linkage profile control method according to claim 2, wherein the profile control pipe column is an oil jacket split injection profile control pipe column, the oil jacket split injection profile control pipe column comprises an oil pipe, two water distributors arranged on the oil pipe, and a packer arranged on the oil pipe and positioned between the two water distributors, and the two water distributors respectively correspond to two oil layers.
5. The oil-water well linkage profile control method according to claim 2, wherein the profile control pipe column is a multi-stage split injection profile control pipe column, the multi-stage split injection profile control pipe column comprises an oil pipe, a plurality of water distributors arranged on the oil pipe and a plurality of packers arranged on the oil pipe, the packers and the water distributors are alternately arranged from top to bottom, and the water distributors respectively correspond to a plurality of oil layers.
6. The oil-water well linkage profile control method as set forth in claim 2, wherein the profile control process is a segment alternate profile control process for performing profile control on a plurality of oil layers with different permeabilities of an oil reservoir to be profile controlled, the segment alternate profile control process comprising:
determining injection quantity and injection concentration of profile control agents required by each of a plurality of oil layers;
preparing profile control agents for a plurality of oil layers according to the injection quantity and the injection concentration of the profile control agents, which are preset;
and injecting the profile control agent into a plurality of oil layers by adopting a mode of injecting the profile control agent and injecting water alternately until the injection quantity of the profile control agent reaches a preset injection quantity.
7. The oil-water well linkage profile control method as set forth in claim 2, wherein the profile control process is an intermittent slug profile control process for performing profile control on an oil layer to be profile controlled having a plurality of areas with different permeabilities, the intermittent slug profile control process comprising:
determining a plurality of injection concentrations of a profile control agent required by an oil layer to be profile controlled and injection amounts corresponding to the injection concentrations;
preparing profile control agent according to the predetermined injection concentration and injection quantity;
according to the sequence of the injection concentration of the profile control agent from high to low, the profile control is carried out on the oil layer to be subjected to profile control for a plurality of rounds, and the step of profile control for each round comprises the following steps: firstly injecting a profile control agent, then closing the well, condensing, and then injecting water.
8. The oil-water well linkage profile control method as claimed in claim 2, wherein the profile control process is a multi-section plug compound profile control process, and the multi-section plug compound profile control process comprises a sectional alternate profile control process and an intermittent section plug profile control process;
the sectional alternate profile control process comprises the following steps:
determining injection quantity and injection concentration of profile control agent required by each of a plurality of oil layers;
preparing profile control agents for a plurality of oil layers according to the injection quantity and the injection concentration of the profile control agents, which are preset;
injecting profile control agents with corresponding concentrations into a plurality of oil layers respectively by adopting a mode of injecting the profile control agents and injecting water alternately until the injection quantity of the profile control agents reaches a preset injection quantity;
the intermittent slug profile control process comprises the following steps:
determining injection concentration of various profile control agents required by an oil layer to be profile controlled and injection quantity corresponding to each injection concentration;
preparing profile control agent according to the predetermined injection concentration and injection quantity;
according to the sequence of the injection concentration of the profile control agent from high to low, the profile control is carried out on the oil layer to be subjected to profile control for a plurality of rounds, and the step of profile control for each round comprises the following steps: firstly injecting a profile control agent, then closing the well, condensing, and then injecting water.
9. The oil-water well linkage profile control method as claimed in claim 1, wherein the water plugging operation comprises mechanical water plugging operation, intelligent water finding and profile control water plugging operation, and the reservoir modification operation comprises acidification, fracturing and perforation.
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