CN117684938B - Reservoir transformation method and device for directional pulse jet flow control seam height - Google Patents
Reservoir transformation method and device for directional pulse jet flow control seam height Download PDFInfo
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Abstract
The invention relates to the technical field of reservoir reconstruction, in particular to a reservoir reconstruction method and device for controlling seam height by directional pulse jet flow, which comprises the steps of obtaining oil pipe pumping pressure, casing wellhead pressure and the cracking pressure of reservoirs above and below a target layer corresponding to the target depth according to a preset time interval in the process of carrying out fracturing operation from the target depth to the target azimuth by utilizing the directional pulse jet flow; and adjusting construction parameters according to the pumping pressure of the oil pipe, the wellhead pressure of the sleeve and the cracking pressure of the upper and lower reservoirs of the target layer, and controlling the relation between the bottom hole pressure and the cracking pressure of the upper and lower reservoirs of the target layer to meet the transformation control condition. According to the invention, the directional pulse jet is utilized to carry out fracturing operation in a target depth direction, the ground technological parameters are adjusted according to the oil pipe pumping pressure, the casing wellhead pressure and the cracking pressure of the upper and lower reservoirs of the target layer, the bottom hole pressure is accurately controlled, the crack height is effectively controlled, the accurate transformation of the target layer is realized, and the reservoir transformation effect is effectively improved.
Description
Technical Field
The invention relates to the technical field of reservoir transformation, in particular to a reservoir transformation method and device for controlling seam height by directional pulse jet flow.
Background
At present, the exploitation mode of the bottom water reservoir at home and abroad mainly aims at perforation production or small-scale acidification, but as the bottom water reservoir is developed to enter the middle and later stages, the stratum energy is gradually reduced, the liquid supply capacity of an oil well is insufficient, and moreover, the near-wellbore area is easy to pollute, so that an oil-gas seepage channel is blocked, and the recovery ratio is influenced. The conventional reservoir reconstruction process is difficult to control the seam height, and the side bottom water reservoir is not provided with an interlayer or is only provided with a very thin interlayer between an oil layer and a water layer, so that the crack is very easy to communicate with the water layer during fracturing construction, the water content rises rapidly after fracturing, the purpose of improving the oil well yield cannot be achieved, the reservoir utilization degree is generally low, the problem of hydraulic loss along the deep well and the ultra-deep well cannot be solved, and further the effective reconstruction of the bottom water reservoir cannot be realized.
The prior published patent document I, with the publication number of CN114856532A, discloses a method, a device and equipment for transforming an oil and gas reservoir, and responds to a reservoir transformation mode acquisition instruction to acquire logging data of the oil and gas reservoir of a target well; then determining the minimum horizontal main stress, brittleness index and fracture toughness value of the oil and gas reservoir of the target well according to the logging data; the weight value of the parameter is used for obtaining the fracturing index of the oil and gas reservoir of the target well; and finally, determining a target reservoir reconstruction mode according to the corresponding relation between the preset fracturing property index and the reservoir reconstruction mode. According to the method, the specific numerical value of the fracturing index in the hydrocarbon reservoir can be calculated through the minimum horizontal main stress, the brittleness index, the fracture toughness and the weight of the hydrocarbon reservoir, so that the actual condition of the hydrocarbon reservoir of a target well can be accurately determined, the corresponding production improvement mode of the hydrocarbon reservoir can be accurately determined, and the single well yield is finally improved.
The second existing published patent document, with publication number CN113622903B, discloses a reservoir reconstruction method and device, and belongs to the technical field of reservoir reconstruction. The utility model discloses a through handling the output data and the first logging data of each test reservoir section, obtain each influencing factor to the projection importance index of output. And obtaining reservoir transformation coefficients of the target reservoir sections based on the projection importance indexes of each influencing factor on the yield and the second logging data of the target reservoir sections, and transforming each target reservoir section according to the reservoir transformation coefficients. The method accurately identifies the influence degree of different factors on the reservoir production, and classifies the reservoir production based on the influence degree, so that different processes are adopted to reform the reservoir based on the classification of each reservoir section, and the heterogeneous reservoir sections are reformed pertinently, so that the single well production is further improved.
The reservoir reconstruction methods disclosed in the above prior published patents are all difficult to control the fracture height, and further cannot realize reservoir reconstruction by controlling the fracture height.
Disclosure of Invention
The invention provides a reservoir reconstruction method and device for controlling seam height by directional pulse jet flow, which overcome the defects of the prior art and can effectively solve the problem that the seam height cannot be controlled in the conventional reservoir reconstruction method.
One of the technical schemes of the invention is realized by the following measures: a reservoir reconstruction method for directional pulse jet control seam height, comprising:
Carrying out fracturing operation at a target depth to a target azimuth by utilizing directional pulse jet flow, and acquiring oil pipe pumping pressure, casing wellhead pressure and fracturing pressures of upper and lower reservoirs of a target layer corresponding to the target depth according to a preset time interval, wherein the target depth and the target azimuth are the depth and azimuth of a residual oil enrichment zone, the fracturing pressures of the upper and lower reservoirs of the target layer are acquired by utilizing a reservoir rock fracturing model, and the reservoir rock fracturing model is established according to a fracture fracturing mechanism;
Adjusting construction parameters according to the pumping pressure of the oil pipe, the wellhead pressure of the sleeve and the starting pressure of the upper and lower reservoirs of the target layer, wherein the relation between the bottom hole pressure and the starting pressure of the upper and lower reservoirs of the target layer is controlled to meet reconstruction control conditions, and the reconstruction control conditions are set according to the requirement of controlling the crack height;
And (5) circulating the process until the fracturing operation is finished.
The following are further optimizations and/or improvements to the above-described inventive solution:
the reservoir rock fracture model described above is as follows:
wherein,
Wherein,Is the cracking pressure; /(I)Perforation initiation pressure for perforation at perforation angle = 0 °; /(I)Perforation initiation pressure for perforation at perforation angle = 90 °; /(I)Pressure of formation pore fluid; /(I)Is a pressure correction factor along the wellbore direction; /(I)、、/>Respectively the maximum horizontal ground stress, the minimum horizontal ground stress and the vertical stress; /(I)Is poisson's ratio; /(I)A contribution coefficient to formation pore pressure; /(I)Is the tensile strength of stratum rock.
Above-mentioned according to oil pipe pump annotate pressure, sleeve pipe well head pressure and the corresponding target layer of purpose degree of depth play and crack pressure adjustment construction parameter of reservoir about, control bottom hole pressure and the target layer and play the relation between the crack pressure of reservoir and satisfy transformation control condition, include:
Determining the corresponding bottom hole pressure according to the casing wellhead pressure;
judging whether the bottom hole pressure and the cracking pressure of the upper and lower reservoirs of the target layer meet the transformation control conditions or not, wherein the transformation control conditions comprise 80-90% of the bottom hole pressure which is the cracking pressure of the upper and lower reservoirs of the target layer;
in response, no adjustment is made;
And if not, adjusting the oil pipe pumping pressure by adjusting the oil pipe displacement, and acquiring the oil pipe pumping pressure, the casing wellhead pressure and the cracking pressure of the reservoirs above and below the target layer corresponding to the target depth again according to the preset time interval.
The above-mentioned adjusting the tubing pump pressure by adjusting the tubing displacement is performed in combination with an adjustment rule, wherein the adjustment rule comprises:
the bottom hole pressure is smaller than the cracking pressure of the upper reservoir layer and the lower reservoir layer of the target layer, and the oil pipe displacement is kept unchanged;
the bottom hole pressure is equal to the cracking pressure of the upper reservoir layer and the lower reservoir layer of the target layer, and the oil pipe displacement is reduced by 2%;
the bottom hole pressure is greater than the cracking pressure of the upper reservoir layer and the lower reservoir layer of the target layer, and the oil pipe discharge capacity is reduced by 5%.
The second technical scheme of the invention is realized by the following measures: a directional pulse jet controlled seam height reservoir retrofitting apparatus comprising:
The data acquisition unit is used for carrying out fracturing operation at a target depth to a target azimuth by utilizing directional pulse jet flow, and acquiring oil pipe pumping pressure, casing wellhead pressure and the fracturing pressure of the upper and lower reservoirs of the target layer corresponding to the target depth according to a preset time interval, wherein the target depth and the target azimuth are the depth and azimuth of a residual oil enrichment zone, the fracturing pressure of the upper and lower reservoirs of the target layer is obtained by using a reservoir rock fracturing model, and the reservoir rock fracturing model is established according to a fracture fracturing mechanism;
And the parameter adjusting unit is used for adjusting construction parameters according to the oil pipe pumping pressure, the casing wellhead pressure and the target depth, which correspond to the cracking pressures of the upper and lower reservoirs of the target layer, and controlling the relation between the bottom hole pressure and the cracking pressures of the upper and lower reservoirs of the target layer to meet the transformation control conditions, wherein the transformation control conditions are set according to the requirement of controlling the crack height.
The following are further optimizations and/or improvements to the above-described inventive solution:
The data acquisition unit includes:
the first acquisition module acquires oil pipe pumping pressure based on a first pressure sensor and acquires casing wellhead pressure based on a second pressure sensor according to a preset time interval;
The second acquisition module is used for acquiring the fracture initiation pressure of the reservoir above and below the target layer by using a reservoir rock fracture initiation model, wherein the reservoir rock fracture initiation model is as follows:
wherein,
Wherein,Is the cracking pressure; /(I)Perforation initiation pressure for perforation at perforation angle = 0 °; /(I)Perforation initiation pressure for perforation at perforation angle = 90 °; /(I)Pressure of formation pore fluid; /(I)Is a pressure correction factor along the wellbore direction; /(I)、、/>Respectively the maximum horizontal ground stress, the minimum horizontal ground stress and the vertical stress; /(I)Is poisson's ratio; /(I)A contribution coefficient to formation pore pressure; /(I)Is the tensile strength of stratum rock.
The parameter adjustment unit includes:
The bottom hole pressure calculation module is used for determining the corresponding bottom hole pressure according to the wellhead pressure of the casing;
The judging and adjusting module is used for judging whether the bottom hole pressure and the cracking pressure of the upper reservoir layer and the lower reservoir layer of the target layer meet the transformation control conditions or not, and if so, the bottom hole pressure and the cracking pressure of the upper reservoir layer and the lower reservoir layer of the target layer do not need to be adjusted; and if not, adjusting the oil pipe pumping pressure by adjusting the oil pipe displacement, and acquiring the oil pipe pumping pressure, the casing wellhead pressure and the cracking pressure of the upper and lower reservoirs of the target layer again according to a preset time interval, wherein the modification control condition comprises that the bottom hole pressure is 80 to 90 percent of the cracking pressure of the upper and lower reservoirs of the target layer.
The third technical scheme of the invention is realized by the following measures: a storage medium having stored thereon a computer program readable by a computer, the computer program being arranged to perform a directional pulse jet control method of reservoir retrofitting with slot height at run-time.
The fourth technical scheme of the invention is realized by the following measures: an electronic device includes a processor and a memory having a computer program stored therein, the computer program loaded and executed by the processor to implement a reservoir retrofitting method of directional pulse jet control slot height.
According to the invention, the directional pulse jet is utilized to carry out fracturing operation in a target depth direction, the perforation depth is improved, the cracking pressure is reduced by means of the 'water hammer' effect of the directional pulse jet, the expansion of cracks is guided in a directional manner, the expansion of the cracks to a residual oil enrichment area is realized, construction parameters are adjusted according to the pumping pressure of an oil pipe, the wellhead pressure of a casing pipe and the cracking pressure of a target layer corresponding to the upper and lower reservoirs of the target layer in the fracturing operation process, the relation between the bottom hole pressure and the cracking pressure of the target layer is controlled to meet the transformation control condition, wherein the transformation control condition is set according to the requirement of controlling the crack height, and therefore, the bottom hole pressure is controlled accurately by adjusting the ground process parameters, the crack height is controlled effectively, the accurate transformation of the target layer is realized, and the reservoir transformation effect is improved effectively.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
FIG. 2 is a flow chart of a method for adjusting construction parameters in the present invention.
Fig. 3 is a schematic view of the structure of the device of the present invention.
Fig. 4 is a graph showing parameters at 2530.0 to 2537.0m reservoir depth in example 3 of the present invention.
Fig. 5 is a schematic view of construction operation monitoring in embodiment 3 of the present invention.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments can be determined according to the technical scheme and practical situations of the present invention.
The invention is further described below with reference to examples and figures:
Example 1: as shown in fig. 1, the embodiment of the invention discloses a reservoir reconstruction method for controlling seam height by directional pulse jet, which comprises the following steps:
step S110, carrying out fracturing operation at a target depth to a target azimuth by utilizing directional pulse jet flow, and acquiring oil pipe pumping pressure, casing wellhead pressure and the fracturing pressures of reservoirs above and below a target layer corresponding to the target depth according to a preset time interval, wherein the target depth and the target azimuth are the depth and azimuth of a residual oil enrichment zone, the fracturing pressures of the reservoirs above and below the target layer are obtained by using a reservoir rock fracturing model, and the reservoir rock fracturing model is established according to a fracture fracturing mechanism;
Step S120, adjusting construction parameters according to the oil pipe pumping pressure, the casing wellhead pressure and the target depth, which correspond to the cracking pressures of the upper and lower reservoirs of the target layer, and controlling the relation between the bottom hole pressure and the cracking pressures of the upper and lower reservoirs of the target layer to meet the transformation control conditions, wherein the transformation control conditions are set according to the requirement of controlling the crack height;
step S130, the process is circulated until the fracturing operation is finished.
The invention discloses a reservoir reconstruction method for controlling seam height by directional pulse jet flow, which comprises the steps of adjusting construction parameters according to oil pipe pumping pressure, casing wellhead pressure and the cracking pressure of upper and lower reservoirs of a target layer corresponding to the target layer in the process of carrying out fracturing operation from the target depth to the target direction by utilizing directional pulse jet flow, controlling the relation between the bottom hole pressure and the cracking pressure of the upper and lower reservoirs of the target layer to meet reconstruction control conditions, wherein the reconstruction control conditions are set according to the requirement of controlling the seam height, thereby accurately controlling the bottom hole pressure, effectively controlling the seam height of the seam by adjusting the ground process parameters, realizing the accurate reconstruction of the target layer and effectively improving the reservoir reconstruction effect.
Example 2: the embodiment of the invention discloses a reservoir transformation method for controlling seam height by directional pulse jet flow, which comprises the following steps:
Step S210, carrying out fracturing operation at a target depth to a target azimuth by utilizing directional pulse jet flow, and acquiring oil pipe pumping pressure, casing wellhead pressure and the fracturing pressures of the upper and lower reservoirs of the target layer corresponding to the target depth according to a preset time interval, wherein the target depth and the target azimuth are the depth and azimuth of a residual oil enrichment zone, the fracturing pressures of the upper and lower reservoirs of the target layer are obtained by using a reservoir rock fracturing model, and the reservoir rock fracturing model is established according to a fracture fracturing mechanism;
According to the preset time interval, the oil pipe pumping pressure, the casing wellhead pressure and the cracking pressure of the upper reservoir layer and the lower reservoir layer of the target layer corresponding to the target depth are obtained, and the method specifically comprises the following steps:
(1) According to a preset time interval, the oil pipe pumping pressure and the casing wellhead pressure are obtained, for example and without limitation, the casing wellhead pressure can be monitored by installing a pressure sensor on a wellhead casing, the pressure sensor is installed on the ground oil pipe pumping end, and the oil pipe pumping pressure is monitored;
(2) And obtaining the fracture initiation pressure of the reservoir above and below the target layer by using a reservoir rock fracture initiation model, wherein the reservoir rock fracture initiation model is as follows:
wherein,
Wherein,The cracking pressure is MPa; /(I)Perforation initiation pressure in MPa for perforation angle = 0 °; /(I)Perforation initiation pressure in MPa for perforation angle = 90 °; /(I)Is the formation pore fluid pressure, MPa; /(I)Is a pressure correction factor along the wellbore direction; /(I)、/>、/>Respectively the maximum horizontal ground stress, the minimum horizontal ground stress and the vertical stress; /(I)Is poisson's ratio; /(I)A contribution coefficient to formation pore pressure; /(I)Is the tensile strength of stratum rock and MPa.
Where perforation angle = 0 ° is the perforation angle parallel to the minimum principal stress or perpendicular to the maximum principal stress, and angle = 90 ° is the perforation angle parallel to the maximum principal stress or perpendicular to the minimum principal stress.
The method for carrying out fracturing operation at a target depth to a target azimuth by using the directional pulse jet flow comprises the following steps:
(1) Determining the depth and the azimuth of a residual oil enrichment zone according to geological data, wherein the residual oil enrichment zone can be classified as an interwell pressure balance zone or an interwell zero pressure gradient part, namely the slope of a tangent line at the point on an interwell pressure distribution curve is zero, namely the derivative of the pressure gradient is zero, and the depth is the depth of an oil layer;
(2) The positioning joint, the centralizer, the pulse generator, the ejector, the centralizer and the guide shoe are sequentially connected to the tail end of the oil pipe from top to bottom to form a fracturing tool string;
(3) Sending the fracturing tool string into a target depth in the well, and enabling a nozzle on the injector to be aligned to a target azimuth needing fracturing;
(4) Injecting high-viscosity pre-fluid with apparent viscosity of more than 50 mPas from an oil pipe, wherein the fluid quantity of the high-viscosity pre-fluid accounts for 60% of the total amount of the pre-fluid, then injecting low-viscosity pre-fluid with apparent viscosity of 10-20 mPas into the oil pipe, wherein the fluid quantity of the low-viscosity pre-fluid accounts for 40% of the total amount of the pre-fluid, and carrying out a sand carrying stage after the injection is completed;
(5) Sand carrying stage: the sand-carrying liquid amount accounts for 60% -70% of the total amount of the sand-carrying liquid and the front-end liquid, the low-viscosity sand-carrying liquid with apparent viscosity of 10-20 mPa.s is injected into the oil pipe in the early stage of low sand ratio, the sand is 40-70 mesh natural quartz sand, the sand ratio is increased from 10% to 20% according to the gradient of 5%, then the oil pipe enters the stage of high sand ratio, the liquid is converted, the high-viscosity sand-carrying liquid with apparent viscosity of more than 50 mPa.s is injected into the oil pipe, the sand ratio is increased from 20% to 40% according to the gradient of 5%, and the sand is 40-70 mesh natural quartz sand. Entering a displacement stage after injection is completed;
(6) And (3) a displacement stage: after the sand carrying stage is finished, high viscosity displacement fluid with apparent viscosity greater than 50 mPa.s is injected into the oil pipe, and the displacement fluid volume is 1.2-1.4 times of the internal volume of the oil pipe.
And (3) carrying out fracturing operation in a target direction at a target depth by utilizing directional pulse jet flow based on the steps (1) to (6), controlling the height of the crack by utilizing the steps (210) to (230), and after the fracturing operation is finished, lifting the oil pipe to align the nozzle carried by the injector on the tool string to a target interval needing fracturing at the next section, repeating the operation process, and realizing infinite section fracturing and reasonable control of the seam height construction operation.
And step S220, adjusting construction parameters according to the oil pipe pumping pressure, the casing wellhead pressure and the target depth, which correspond to the cracking pressures of the upper and lower reservoirs of the target layer, and controlling the relation between the bottom hole pressure and the cracking pressures of the upper and lower reservoirs of the target layer to meet the transformation control conditions, wherein the transformation control conditions are set according to the requirement of controlling the crack height.
The step S220, as shown in fig. 2, includes:
step S221, determining the corresponding bottom hole pressure according to the casing wellhead pressure;
The bottom hole pressure = casing wellhead pressure + liquid column pressure; liquid column pressure = bottom hole vertical depth x fracturing fluid density x gravity acceleration;
Step S222, judging whether the bottom hole pressure and the cracking pressures of the upper and lower reservoirs of the target layer meet the transformation control conditions, wherein the transformation control conditions comprise 80-90% of the bottom hole pressure as the cracking pressures of the upper and lower reservoirs of the target layer;
step S223, responding to the response, not adjusting, namely not adjusting the oil pipe displacement, and maintaining the current oil pipe pumping pressure unchanged;
Step S224, in response to no, the oil pipe pumping pressure is adjusted by adjusting the oil pipe displacement, and the oil pipe pumping pressure, the casing wellhead pressure and the cracking pressure of the upper reservoir layer and the lower reservoir layer corresponding to the target depth are obtained again according to the preset time interval.
The above-mentioned adjusting the tubing pump pressure by adjusting the tubing displacement is performed in combination with an adjustment rule, wherein the adjustment rule comprises:
the bottom hole pressure is smaller than the cracking pressure of the upper reservoir layer and the lower reservoir layer of the target layer, and the oil pipe displacement is kept unchanged;
the bottom hole pressure is equal to the cracking pressure of the upper reservoir layer and the lower reservoir layer of the target layer, and the oil pipe displacement is reduced by 2%;
The bottom hole pressure is larger than the cracking pressure of the upper reservoir layer and the lower reservoir layer of the target layer, and the oil pipe displacement is reduced by 5%;
Step S230, the process is circulated until the fracturing operation is finished.
In summary, the invention utilizes the directional pulse jet to carry out fracturing operation in a target depth to a target direction, the perforation depth is improved, the cracking pressure is reduced by means of the 'water hammer' effect of the directional pulse jet, the expansion of cracks is guided in a directional way, the expansion of the cracks to a residual oil enrichment area is realized, in the fracturing operation process, the construction parameters are adjusted according to the pumping pressure of an oil pipe, the wellhead pressure of a casing pipe and the cracking pressure of a target layer corresponding to the upper reservoir layer and the lower reservoir layer, the relation between the bottom hole pressure and the cracking pressure of the target layer is controlled to meet the transformation control conditions, wherein the transformation control conditions are set according to the requirement of controlling the crack height, and therefore, the bottom hole pressure is controlled accurately by adjusting the ground process parameters, the crack height is controlled effectively, the accurate transformation of the target layer is realized, and the reservoir layer transformation effect is improved effectively.
Example 3: a certain conventional vertical well needing to be controlled to avoid water fracturing is provided with a well number YXXXX, the well oil layer casing is 139.7mm multiplied by 9.17mm, the inner diameter is 121.36mm, the steel grade N80 is high in internal pressure resistance and strength of 63.31MPa, and the depth of a target layer is modified: 2540.5 to 2548.0m. The following is presented according to the reservoir rock fracture model:
wherein,
Wherein,The cracking pressure is MPa; /(I)Perforation initiation pressure in MPa for perforation angle = 0 °; /(I)Perforation initiation pressure in MPa for perforation angle = 90 °; /(I)Is a pressure correction factor along the wellbore direction; /(I)、/>、/>Respectively the maximum horizontal ground stress, the minimum horizontal ground stress and the vertical stress; /(I)Is poisson's ratio; /(I)A contribution coefficient to formation pore pressure; /(I)Is the formation pore fluid pressure, MPa; /(I)Is the tensile strength of stratum rock and MPa.
According to the stratum characteristics of the block, obtainTaking the constant 1.01,/>Taking the constant of 9.5.
And (4) calculating the reservoir fracture initiation pressure on the reconstruction target layer:
Depth of reservoir on the modified destination layer: 2530.0 to 2537.0m, calculated from software (which may use existing rock mechanics parameter calculation software): =62.57MPa，/>=43.51MPa，/>=54.52MPa，/>=0.30，σt=6.37MPa，/> =24.85 MPa. Bringing into a reservoir rock fracture model: /(I) =58.14MPa，/>=42.33 MPa, upper reservoir fracture pressure/>=42.33 MPa; reform the reservoir depth under the destination layer: 2553.0-2557.0m, calculated from software: /(I)=61.54MPa，/>=42.32MPa，/>=55.02MPa，/>=0.28，σt=7.46MPa，/>=25.02 MPa. Bringing into a reservoir rock fracture model: /(I)=56.38MPa，/>= 43.48MPa, lower reservoir fracture pressure/>= 43.48MPa. Wherein, the change of partial parameters corresponding to the depth of the reservoir layer on different reconstruction target layers is shown in figure 4.
The positioning joint, the centralizer, the pulse generator, the ejector, the centralizer and the guide shoe are sequentially connected to the tail end of the oil pipe from top to bottom to form a fracturing tool string; the fracturing tool string is sent into the well at the target depth, and the nozzle on the injector is aligned with the target direction of the fracturing, so as to prepare for construction operation.
In the reconstruction process, the bottom hole pressure is 80 to 90 percent of the cracking pressure of the upper and lower reservoirs of the target layer, and the bottom hole pressure is smaller than the cracking pressure of the upper and lower reservoirs of the target layer, so that the oil pipe displacement is kept unchanged; the bottom hole pressure is equal to the cracking pressure of the upper reservoir layer and the lower reservoir layer of the target layer, and the oil pipe displacement is reduced by 2%; and the bottom hole pressure is greater than the cracking pressure of the upper and lower reservoirs of the target layer, the oil pipe displacement is reduced by 5%, and the bottom hole pressure is continuously adjusted to be 80-90% of the cracking pressure of the upper and lower reservoirs of the target layer.
As shown in fig. 5, from the site construction of the present well, the wellhead casing pressure is basically maintained at 6 to 12MPa, the liquid column pressure is 24.96MPa, and the bottom hole pressure is 30.96 to 36.96MPa. At this time, the pressure acting on the bottom of the well is less than 80 to 90 percent of the cracking pressure of the upper reservoir and the lower reservoir, so that the well construction is smoothly completed without adjusting the oil pipe discharge.
Example 4: as shown in fig. 3, an embodiment of the present invention discloses a reservoir reforming device with directional pulse jet control seam height, which includes:
The data acquisition unit is used for carrying out fracturing operation at a target depth to a target azimuth by utilizing directional pulse jet flow, and acquiring oil pipe pumping pressure, casing wellhead pressure and the fracturing pressure of the upper and lower reservoirs of the target layer corresponding to the target depth according to a preset time interval, wherein the target depth and the target azimuth are the depth and azimuth of a residual oil enrichment zone, the fracturing pressure of the upper and lower reservoirs of the target layer is obtained by using a reservoir rock fracturing model, and the reservoir rock fracturing model is established according to a fracture fracturing mechanism;
And the parameter adjusting unit is used for adjusting construction parameters according to the oil pipe pumping pressure, the casing wellhead pressure and the target depth, which correspond to the cracking pressures of the upper and lower reservoirs of the target layer, and controlling the relation between the bottom hole pressure and the cracking pressures of the upper and lower reservoirs of the target layer to meet the transformation control conditions, wherein the transformation control conditions are set according to the requirement of controlling the crack height.
The data acquisition unit includes:
the first acquisition module acquires oil pipe pumping pressure based on a first pressure sensor and acquires casing wellhead pressure based on a second pressure sensor according to a preset time interval;
The second acquisition module is used for acquiring the fracture initiation pressure of the reservoir above and below the target layer by using a reservoir rock fracture initiation model, wherein the reservoir rock fracture initiation model is as follows:
wherein,
Wherein,The cracking pressure is MPa; /(I)Perforation initiation pressure in MPa for perforation angle = 0 °; /(I)Perforation initiation pressure in MPa for perforation angle = 90 °; /(I)Is the formation pore fluid pressure, MPa; /(I)Is a pressure correction factor along the wellbore direction; /(I)、/>、/>Respectively the maximum horizontal ground stress, the minimum horizontal ground stress and the vertical stress; /(I)Is poisson's ratio; /(I)A contribution coefficient to formation pore pressure; /(I)Is the tensile strength of stratum rock and MPa.
The parameter adjustment unit includes:
The bottom hole pressure calculation module is used for determining the corresponding bottom hole pressure according to the wellhead pressure of the casing;
The judging and adjusting module is used for judging whether the bottom hole pressure and the cracking pressure of the upper reservoir layer and the lower reservoir layer of the target layer meet the transformation control conditions or not, and if so, the bottom hole pressure and the cracking pressure of the upper reservoir layer and the lower reservoir layer of the target layer do not need to be adjusted; and if not, adjusting the oil pipe pumping pressure by adjusting the oil pipe displacement, and acquiring the oil pipe pumping pressure, the casing wellhead pressure and the cracking pressure of the upper and lower reservoirs of the target layer again according to a preset time interval, wherein the modification control condition comprises that the bottom hole pressure is 80 to 90 percent of the cracking pressure of the upper and lower reservoirs of the target layer.
Example 5: the embodiment of the invention discloses a storage medium, wherein a computer program which can be read by a computer is stored on the storage medium, and the computer program is set to execute a reservoir reconstruction method of directional pulse jet control seam height when running.
The storage medium may include, but is not limited to: various media capable of storing computer programs, such as a USB flash disk, a read-only memory, a mobile hard disk, a magnetic disk or an optical disk.
Example 6: the embodiment of the invention discloses an electronic device, which comprises a processor and a memory, wherein a computer program is stored in the memory, and the computer program is loaded and executed by the processor to realize a reservoir reconstruction method of directional pulse jet flow control seam height.
The processor may be a Central Processing Unit (CPU), a general purpose processor, a digital signal processor DSP, ASIC, FPGA, or other programmable logic device, transistor logic device, hardware components, or any combination thereof. Which may implement or perform the various exemplary logic blocks, modules and circuits described in connection with this disclosure. Combinations of computing functions may also be implemented, for example, as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, or the like. The memory may include, but is not limited to: various media capable of storing computer programs, such as a USB flash disk, a read-only memory, a mobile hard disk, a magnetic disk or an optical disk.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The scheme in the embodiment of the application can be realized by adopting various computer languages, such as object-oriented programming language Java, an transliteration script language JavaScript and the like.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
The technical characteristics form the optimal embodiment of the invention, have stronger adaptability and optimal implementation effect, and can increase or decrease unnecessary technical characteristics according to actual needs so as to meet the requirements of different situations.
Claims (5)
1. A reservoir reforming method with directional pulse jet flow control seam height, which is characterized by comprising the following steps:
Carrying out fracturing operation at a target depth to a target azimuth by utilizing directional pulse jet flow, and acquiring oil pipe pumping pressure, casing wellhead pressure and the fracturing pressure of the upper and lower reservoirs of the target layer corresponding to the target depth according to a preset time interval, wherein the target depth and the target azimuth are the depth and azimuth of a residual oil enrichment zone, the fracturing pressure of the upper and lower reservoirs of the target layer is obtained by utilizing a reservoir rock fracturing model, and the reservoir rock fracturing model is established according to a fracture fracturing mechanism, as follows:
wherein, Is the cracking pressure; /(I)Perforation initiation pressure for perforation at perforation angle = 0 °; /(I)Perforation initiation pressure for perforation at perforation angle = 90 °; /(I)Pressure of formation pore fluid; /(I)Is a pressure correction factor along the wellbore direction; Respectively the maximum horizontal ground stress, the minimum horizontal ground stress and the vertical stress; /(I) Is poisson's ratio; /(I)A contribution coefficient to formation pore pressure; /(I)Is the tensile strength of stratum rock;
Determining the corresponding bottom hole pressure according to the casing wellhead pressure;
judging whether the bottom hole pressure and the cracking pressure of the upper and lower reservoirs of the target layer meet the transformation control conditions or not, wherein the transformation control conditions comprise 80-90% of the bottom hole pressure as the cracking pressure of the upper and lower reservoirs of the target layer;
in response, no adjustment is made;
if not, adjusting the oil pipe pumping pressure by adjusting the oil pipe displacement, and acquiring the oil pipe pumping pressure, the casing wellhead pressure and the cracking pressure of the upper reservoir layer and the lower reservoir layer corresponding to the target depth again according to a preset time interval;
And (5) circulating the process until the fracturing operation is finished.
2. The method of reservoir retrofitting with directional pulsed jet control slot height of claim 1, wherein said adjusting tubing pump pressure by adjusting tubing displacement is performed in conjunction with an adjustment rule, wherein the adjustment rule comprises:
the bottom hole pressure is smaller than the cracking pressure of the upper reservoir layer and the lower reservoir layer of the target layer, and the oil pipe displacement is kept unchanged;
the bottom hole pressure is equal to the cracking pressure of the upper reservoir layer and the lower reservoir layer of the target layer, and the oil pipe displacement is reduced by 2%;
the bottom hole pressure is greater than the cracking pressure of the upper reservoir layer and the lower reservoir layer of the target layer, and the oil pipe discharge capacity is reduced by 5%.
3. A directional pulse jet controlled slot height reservoir retrofitting apparatus employing the method of any one of claims 1 to 2, comprising:
a data acquisition unit comprising:
the first acquisition module acquires oil pipe pumping pressure based on a first pressure sensor and acquires casing wellhead pressure based on a second pressure sensor according to a preset time interval;
The second acquisition module is used for acquiring the fracture initiation pressure of the reservoir above and below the target layer by using a reservoir rock fracture initiation model, wherein the reservoir rock fracture initiation model is as follows:
wherein, Is the cracking pressure; /(I)Perforation initiation pressure for perforation at perforation angle = 0 °; /(I)Perforation initiation pressure for perforation at perforation angle = 90 °; /(I)Pressure of formation pore fluid; /(I)Is a pressure correction factor along the wellbore direction; Respectively the maximum horizontal ground stress, the minimum horizontal ground stress and the vertical stress; /(I) Is poisson's ratio; /(I)A contribution coefficient to formation pore pressure; /(I)Is the tensile strength of stratum rock;
A parameter adjustment unit comprising:
The bottom hole pressure calculation module is used for determining the corresponding bottom hole pressure according to the wellhead pressure of the casing;
The judging and adjusting module is used for judging whether the bottom hole pressure and the cracking pressure of the upper reservoir layer and the lower reservoir layer of the target layer meet the transformation control conditions or not, and if so, the bottom hole pressure and the cracking pressure of the upper reservoir layer and the lower reservoir layer of the target layer do not need to be adjusted; and if not, adjusting the oil pipe pumping pressure by adjusting the oil pipe displacement, and acquiring the oil pipe pumping pressure, the casing wellhead pressure and the cracking pressure of the upper and lower reservoirs of the target layer again according to a preset time interval, wherein the modification control condition comprises that the bottom hole pressure is 80-90% of the cracking pressure of the upper and lower reservoirs of the target layer.
4. A storage medium having stored thereon a computer program readable by a computer, the computer program being arranged to perform the method of reservoir retrofitting of directional pulse jet control slot height according to any of claims 1 to 2 when run.
5. An electronic device comprising a processor and a memory, the memory having stored therein a computer program that is loaded and executed by the processor to implement the directional pulse jet control slot height reservoir retrofitting method of any one of claims 1 to 2.
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