CN117217025A - Ultra-short radius horizontal well design method - Google Patents
Ultra-short radius horizontal well design method Download PDFInfo
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Abstract
The invention relates to the field of petroleum and natural gas exploration and development, in particular to an ultra-short radius horizontal well design method, which comprises the following steps of S1, identifying an internal interlayer of a sand body through comprehensive analysis of a logging curve, a core and an interlayer identification standard; step S2, further splitting the thick sand layer by using an interlayer, and carrying out fine depiction on the sand bodies among the wells by combining earthquake inversion sandstone prediction to finish the well earthquake combined deposition phase depiction; step S3, establishing a sand body fine geological model according to fine depiction of the inter-well sand body; step S4, carrying out fine numerical simulation on the basis of the three-dimensional geological model established in the step S3, quantitatively describing the distribution characteristics of the residual oil in the sand body, and determining the optimal design scheme of the final ultra-short radius horizontal well through numerical simulation prediction of the submerged arc effect; and S5, performing test operation according to the determined optimal design scheme of the final ultra-short radius horizontal well, and judging whether the optimal design scheme is reasonable or not.
Description
Technical Field
The invention relates to the field of petroleum and natural gas exploration and development, in particular to a design method of an ultra-short radius horizontal well.
Background
The ultra-short radius horizontal well technique is also called ultra-short radius sidetrack horizontal well technique, and is characterized by that in the vertical well in which the casing is put down, the window sidetrack is opened, and the flexible drilling tool is combined with conventional drilling equipment, and the flexible drilling tool is turned in the oil layer to make the angle of inclination, after the angle of inclination is made, the horizontal section can be continuously drilled in horizontal direction. The horizontal well drilling machine has the advantages that the curvature radius is small, and the horizontal well drilling machine can meet the requirement of small-scale sand bodies; secondly, compared with the conventional horizontal well, the drilling cost is low; thirdly, the single well yield is high and is generally 2-3 times of the yield of the vertical well; fourthly, the construction period is short, only 1-2 days is needed, the construction equipment is simple, and the workover rig for underground operation can be used as power equipment.
Chinese patent publication No.: CN116562040a discloses a trajectory optimization method and system for ultra-short radius sidetrack horizontal well, the method comprising: establishing a sidetrack horizontal well geological model; determining key geological factors affecting the productivity of the sidetrack horizontal well; performing numerical simulation analysis according to the key geological factors based on the sidetracking horizontal well geological model; and carrying out oil production sensitivity analysis according to the numerical simulation analysis result, and determining the optimal parameter value of the ultra-short radius horizontal well track according to the oil production sensitivity analysis result.
The existing ultra-short radius horizontal well technology has low oil deposit description precision in the residual oil of the excavation, and potential problems and risks cannot be found before the formal operation of all ultra-short radius horizontal wells, so that optimization and improvement can be performed in time, and the cost and the risks are reduced.
Disclosure of Invention
Therefore, the invention aims to provide an ultra-short radius horizontal well design method, which solves the problems that in the prior art, the description precision of oil reservoirs in the oil which is reserved in the ultra-short radius horizontal well technology is low, potential problems and risks cannot be found before the full ultra-short radius horizontal well formally runs, and optimization and improvement are carried out in time, so that the cost and the risks are reduced.
In order to achieve the above object, the present invention provides a method for designing an ultra-short radius horizontal well, comprising,
step S1, identifying an internal interlayer of the sand body through comprehensive analysis of a logging curve, a core and an interlayer identification standard;
step S2, further splitting the thick sand layer by using an interlayer, and carrying out fine depiction on the sand bodies among the wells by combining earthquake inversion sandstone prediction to finish the well earthquake combined deposition phase depiction;
step S3, establishing a sand body fine geological model according to fine depiction of the inter-well sand body;
step S4, carrying out fine numerical simulation on the basis of the three-dimensional geological model established in the step S3, quantitatively describing the distribution characteristics of the residual oil in the sand body, and determining the optimal design scheme of the final ultra-short radius horizontal well through numerical simulation prediction of the submerged arc effect;
step S5, performing trial run according to the determined optimal design scheme of the final ultra-short radius horizontal well, and judging whether the optimal design scheme is reasonable or not;
in step S5, single-point production capacity evaluation and overall production capacity evaluation are performed on each of the ultra-short radius horizontal wells that are in trial operation, production levels of each of the ultra-short radius horizontal wells are determined according to the single-point production capacity evaluation, production scores of the ultra-short radius horizontal wells under different production levels are calculated according to the different production levels, and overall actual production capacity is calculated according to the different production scores, so that a scheme level of the final ultra-short radius horizontal well optimal design scheme and specific measures under different scheme levels are determined.
Further, dividing a plurality of the ultra-short radius horizontal wells set in the final ultra-short radius horizontal well optimization design scheme, wherein the ultra-short radius horizontal wells in the first set are used for production test operation, and carrying out production capacity assessment according to the actual production capacity of each ultra-short radius horizontal well in the obtained test operation stage, and the production capacity assessment comprises single-point production capacity assessment and overall production capacity assessment.
Further, single-point production capacity evaluation is carried out according to the obtained actual production capacity and the set standard production capacity to determine the production grade of the ultra-short radius horizontal well,
under the condition that the mining grade of the ultra-short radius horizontal well is primary mining, the absolute value of a first difference value between the actual mining capacity and the standard mining capacity is larger than the mining capacity difference evaluation value, and the actual mining capacity is smaller than the standard mining capacity;
under the condition that the production grade of the ultra-short radius horizontal well is three-level production, the absolute value of the first difference between the actual production capacity and the standard production capacity is larger than the evaluation value of the difference of the production capacity, and the actual production capacity is larger than the standard production capacity.
Further, the ultra-short radius horizontal well of the primary production and the ultra-short radius horizontal well of the tertiary production are integrated, including a primary point location and a tertiary point location,
a first calculation compensation parameter of the primary mining scoring is set on the basis of the actual mining capacity of the primary point under the condition of calculating the primary mining scoring of the primary point;
and calculating a second compensation parameter of the three-level mining score on the basis of the actual mining capacity provided with the three-level point under the condition of calculating the three-level mining score under the three-level point.
Further, the primary and tertiary production scores obtained calculate the overall actual production capacity K using the following formula:
K＝∑ x q ＝1 Cx×Gx-∑ p y＝1 Cy×Fy
wherein Cx is the actual mining ability of the first level x point location, gx is the first calculated compensation parameter for the actual mining ability of the first level x point location to score the first level mining; cy is the actual exploitation capacity of the third level point, fy is the second calculated compensation parameter of the third level point's actual exploitation capacity to the third level exploitation score.
Further, under the condition that the final ultra-short radius horizontal well optimal design scheme is a first-class scheme, the overall actual exploitation capacity exceeds the maximum value in a preset scheme level evaluation interval;
based on the condition that the final ultra-short radius horizontal well optimal design scheme is a second-level scheme, the overall actual exploitation capacity is within the allowable range of a preset scheme level evaluation interval;
and under the condition that the final ultra-short radius horizontal well optimal design scheme is a third-level scheme, the overall actual exploitation capacity is smaller than the minimum value in a preset scheme level evaluation interval.
Further, if the optimal design scheme of the final ultra-short radius horizontal well is judged to be reasonable according to the overall actual exploitation capability, the ultra-short radius horizontal wells in the second set are started to run formally according to the scheme;
if the final ultra-short radius horizontal well optimization design scheme is judged to be unreasonable in design and is the level B scheme according to the overall actual exploitation capability, corresponding correction measures are made for the scheme;
and if the final ultra-short radius horizontal well optimal design scheme is judged to be unreasonable according to the overall actual exploitation capability and is the third-level scheme, the scheme is redesigned.
Further, in step S2,
if the split thick sand layer belongs to the physical interlayer, the split sand body keeps consistent with the original phase type;
if the split thick sand layer belongs to the argillaceous interlayer or the calcareous interlayer, the split sand body is adjusted according to new well logging phase and adjacent well microphase type comprehensive analysis.
Further, in step S3, the sand body is finely modeled, including,
establishing a layer model based on a model unit grid conversion technology and a sand vertical shaping technology;
constructing a fault model based on the constraint of seismic interpretation and layering;
wherein, the model unit grid conversion technology models the sand body by taking the top and the bottom of the sand body as layering and taking the small layers and the layer groups as layer group surfaces, so that the sand body model models the sand body on the vertical shelf under the common constraint of the thickness plane distribution of the sand body and the top and the bottom of the small layers,
the sand body vertical shaping technology is characterized in that a control method of a uniform thickness surface is adopted: and establishing a sand body bottom layer model by using a sand body thickness graph obtained by modeling software and an established sand body top layer model as constraints, wherein the top and bottom layer models are required to be overlapped together at a sand body pinch-out position and are matched with the actual spatial distribution of the sand body.
Further, the design of the ultra-short radius horizontal well is optimized, including optimization of fault edge type residual oil design suitable for ultra-short radius horizontal well digging, optimization of gravity separation type residual oil design and optimization of mud wedge shielding type residual oil design.
Compared with the prior art, the method has the beneficial effects that according to the determined optimal design scheme of the final ultra-short radius horizontal well, the method carries out exploitation test operation on part of the ultra-short radius horizontal wells in the scheme, carries out single-point exploitation capability evaluation and overall exploitation capability evaluation on all the ultra-short radius horizontal wells in the test operation, determines the exploitation grades of all the ultra-short horizontal wells according to the single-point exploitation capability evaluation, calculates exploitation scores of the ultra-short radius horizontal wells under different exploitation grades through different exploitation grades, calculates overall actual exploitation capability according to the exploitation scores of different grades, thereby determining the scheme grade of the optimal design scheme of the final ultra-short radius horizontal well and specific measures under different scheme grades, and can timely find whether the scheme design is reasonable or not by carrying out exploitation test operation and evaluation on part of the ultra-short radius horizontal wells, so as to avoid later accidents caused by unreasonable scheme design and potential problems and risks found before formal operation of all the ultra-short radius horizontal wells, and timely optimize and improve exploitation costs and risks, and improve the efficiency of the ultra-short radius horizontal wells.
In particular, through setting different standard exploitation capacities and exploitation capacity difference evaluation values for the ultra-short radius horizontal wells at different positions, the exploitation conditions of all the ultra-short horizontal wells can be well determined, the exploitation grades of all the ultra-short radius horizontal wells can be judged through analyzing the actual exploitation capacity of each ultra-short horizontal well, data support is provided for improving the optimal design scheme of the ultra-short radius horizontal wells, and exploitation efficiency is guaranteed.
In particular, by arranging and summarizing different three-level points and one-level points and integrally calculating the overall exploitation capacity of a plurality of ultra-short radius horizontal wells in the first set D, data support is provided for judging the scheme level of the final ultra-short radius horizontal well optimal design scheme, and exploitation efficiency is guaranteed.
In particular, the interlayer inside the sand body is identified through comprehensive analysis of a logging curve, a core and an interlayer identification standard; further splitting the thick sand layer by using an interlayer, and carrying out fine characterization on the sand bodies among the wells by combining earthquake inversion sandstone prediction to finish well earthquake combined deposition characterization; establishing a sand body fine geological model according to the fine depiction of the inter-well sand body; carrying out fine numerical simulation on the basis of the established three-dimensional geological model, quantitatively describing the distribution characteristics of residual oil in the sand body, predicting the digging effect through numerical simulation, and determining the final ultra-short radius horizontal well optimization design scheme; aiming at the problem that the description precision of oil reservoirs in the oil field is required to be further improved in the technology of the ultra-short radius horizontal well in the later period of oil field development, the technology of fine description of the oil reservoirs in the narrow-thin sand body oil field sand body is developed, the ultra-short radius horizontal well is optimally designed on the basis, the measure mining effect is guaranteed to the maximum extent, and the recovery ratio in the later period of oil field development is improved.
In particular, when in actual modeling, the stratum thickness at the pinch-out position of the sand body is 0m, the stratum thickness at the sand body is equal to the sand body thickness, and the sand body undulating form is consistent with the small-level undulating form, so that the established sand body top and bottom layer models are reasonable and accord with the actual geological conditions; in order to accurately reflect the distribution of faults, the construction model is built under the constraint of seismic interpretation and sand layering, and fault elements such as trend, tendency, extension length and the like of the faults are accurately reflected; the spread of faults on the plane is faithful to the fault polygon of the seismic interpretation; and the accuracy of the fault plane model at the breakpoint is ensured by fine adjustment of the stratum contrast logging breakpoint.
Drawings
FIG. 1 is a flow chart of an ultra-short radius horizontal well design method according to an embodiment of the present invention;
FIG. 2 is a logic diagram of single point production capacity evaluation in an ultra-short radius horizontal well design method according to an embodiment of the present invention;
FIG. 3 is a logic diagram of overall production capacity assessment in an ultra-short radius horizontal well design method according to an embodiment of the present invention;
FIG. 4 is a logic diagram of determining specific measures at different scheme levels in an ultra-short radius horizontal well design method according to an embodiment of the present invention.
Detailed Description
In order that the objects and advantages of the invention will become more apparent, the invention will be further described with reference to the following examples; it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that, in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1-4, fig. 1 is a flowchart of an ultra-short radius horizontal well design method according to an embodiment of the present invention; FIG. 2 is a logic diagram of single point production capacity evaluation in an ultra-short radius horizontal well design method according to an embodiment of the present invention; FIG. 3 is a logic diagram of overall production capacity assessment in an ultra-short radius horizontal well design method according to an embodiment of the present invention; FIG. 4 is a logic diagram of determining specific measures at different scheme levels in an ultra-short radius horizontal well design method according to an embodiment of the present invention.
The embodiment of the invention provides a design method of an ultra-short radius horizontal well, which comprises the following steps,
step S1, identifying an internal interlayer of the sand body through comprehensive analysis of a logging curve, a core and an interlayer identification standard;
step S2, further splitting the thick sand layer by using an interlayer, and carrying out fine depiction on the sand bodies among the wells by combining earthquake inversion sandstone prediction to finish the well earthquake combined deposition phase depiction;
step S3, establishing a sand body fine geological model according to fine depiction of the inter-well sand body;
step S4, carrying out fine numerical simulation on the basis of the three-dimensional geological model established in the step S3, quantitatively describing the distribution characteristics of the residual oil in the sand body, and determining the optimal design scheme of the final ultra-short radius horizontal well through numerical simulation prediction of the submerged arc effect;
and S5, performing test operation according to the determined optimal design scheme of the final ultra-short radius horizontal well, and judging whether the optimal design scheme is reasonable or not.
In particular, in step S1, the identified sand body internal interlayer includes,
the natural potential of the argillaceous interlayer is close to a base line, the microelectrode returns obviously, the amplitude difference is almost zero, and the deep direction-finding resistivity is reduced by more than 50% of an adjacent layer;
the microelectrode curve of the physical interlayer has obvious return, the return amplitude is lower than that of the muddy interlayer, and the physical interlayer has a certain amplitude difference, the natural potential amplitude is reduced, and the natural gamma value is increased;
a calcareous interlayer having a deep direction-finding resistivity higher than or near the oil layer resistivity; the curve ratio of the microelectrode exceeds 1.2 times of that of the adjacent layer and is in a peak shape; the acoustic wave time difference is significantly lower.
Specifically, in step S2, in this embodiment, during the further splitting of the thick sand layer,
if the split thick sand layer belongs to the physical interlayer, the split sand body keeps consistent with the original phase type;
if the split thick sand layer belongs to the argillaceous interlayer or the calcareous interlayer, the split sand body is adjusted according to new well logging phase and adjacent well microphase type comprehensive analysis.
In particular, the present embodiment, in step S3, finely models the sand body, including,
a layer model is established by a model unit grid conversion technology and a sand vertical shaping technology,
wherein, the model unit grid conversion technology models the sand body by taking the top and the bottom of the sand body as layering and taking the small layers and the layer groups as layer group surfaces, so that the sand body model models the sand body on the vertical shelf under the common constraint of the thickness plane distribution of the sand body and the top and the bottom of the small layers,
the sand body vertical shaping technology is characterized in that a control method of a uniform thickness surface is adopted: establishing a sand body bottom layer model by using a sand body thickness graph obtained by modeling software and an established sand body top layer model as constraints, wherein the top and bottom layer models are required to be overlapped together at a sand body pinch-out position and are matched with the actual spatial spreading of the sand body;
fault models are built by constructing a construction model under the constraints of seismic interpretation and stratification.
In the embodiment of the invention, during actual modeling, the stratum thickness at the pinch-out position of the sand body is 0m, the stratum thickness at the sand body is equal to the sand body thickness, and the sand body undulating form is consistent with the small-level undulating form, so that the established sand body top and bottom layer models are reasonable and accord with the actual geological conditions; in order to accurately reflect the distribution of faults, the construction model is built under the constraint of seismic interpretation and sand layering, and fault elements such as trend, tendency, extension length and the like of the faults are accurately reflected; the spread of faults on the plane is faithful to the fault polygon of the seismic interpretation; and the accuracy of the fault plane model at the breakpoint is ensured by fine adjustment of the stratum contrast logging breakpoint.
Specifically, the embodiment uses deposit facies deterministic modeling and reservoir physical property stochastic modeling to finely model the sand,
the sedimentary facies deterministic modeling digitizes a sedimentary facies belt chart provided by geological personnel, and a deterministic algorithm is adopted to establish a fine sedimentary facies model;
and the reservoir physical property random simulation adopts a phase control random modeling technology to establish a reservoir parameter model so as to improve the prediction precision of reservoir property parameters between wells.
Specifically, the present embodiment describes the sand body internal residual oil in step S4, including sand body internal residual oil control factor analysis, sand body residual oil distribution type, and sand body residual oil potential study;
wherein the analysis of the control factors of the residual oil in the sand body comprises the analysis of local microstructure, composite closed fault, deposited microphase type, sand body communication relation, reservoir heterogeneity, well pattern perfection degree and block dynamic development history,
the sand body residual oil distribution type is used for classifying the residual oil by combining different types through researching the sand body type, microstructure and oil layer heterogeneity, and comprises a numerical simulation technology, a differential by gravity, mud wedge shielding, plane contradiction, a sand body side part and a fault side part;
and the sand body residual oil potential research is used for realizing the residual oil into different refining areas through realizing potential, and quantifying the residual oil potential according to different well region sand body types and potential positions and combining well patterns and injection and production relations.
In particular, the embodiment optimizes the design of the ultra-short radius horizontal well, comprising optimizing the design of fault edge type residual oil suitable for the ultra-short radius horizontal well to be dug and the design of gravity separation type residual oil and mud wedge shielding type residual oil,
and (3) designing and optimizing the fault edge part type residual oil: cutting the sand body near the fault completely, lacking a drainage channel for injecting water, so as to form residual oil at the edge of the fault, laterally drilling one side of a lower disc of the fault by utilizing the ultra-short radius horizontal well technology, and digging reserves at the edge of the fault along the fault trend or the sand body extending direction in azimuth;
the design optimization of the gravity-differential type residual oil is as follows: at a microstructure high point without well control, no injected water is displaced to become a residual oil retention area, sidetracking is carried out on the microstructure high point well, and the microstructure high point is close to the top of an oil layer along a gentle azimuth of the structure, wherein the microstructure high point is an important place for the re-accumulation of residual oil in the oil-water re-separation along with the oil reservoir development process;
the design optimization of the mud wedge shielding type residual oil is as follows: mainly communicating a water well structure body with an oil well lower structure body for synchronous deposition, wherein injected water flows in the lower synchronous structure body preferentially, residual oil in the oil well upper structure body is enriched according to the shielding effect of a mud wedge gap, the sidetrack position of the ultra-short radius horizontal well is close to the upper part of a sand body, and an inclination angle is designed along the top of the sand body;
the method comprises the steps of laterally drilling a selected well to determine the effective thickness of a target layer, the standard of single-layer residual recoverable reserves, analysis of potential zone development conditions and effect evaluation, and designing the drilling direction to be vertical to the direction of a crack or to form a certain included angle with the direction of the crack, wherein the drilling direction is free of flooding or low-flooding.
Specifically, in the final ultra-short radius horizontal well optimization design scheme in this embodiment, the total number of ultra-short radius horizontal wells is N, a part of the ultra-short radius horizontal wells is selected from the total number N of ultra-short radius horizontal wells as a first set D, the remaining part of the total number N of ultra-short radius horizontal wells is set as a second set D1, the ultra-short radius horizontal wells in the first set D are tested according to the determined final ultra-short radius horizontal well optimization design scheme, and a plurality of ultra-short radius horizontal wells are in the first set D, including, a first ultra-short radius horizontal well A1, a second ultra-short radius horizontal well A2 … …, an ultra-short radius horizontal well An, where N is less than N, and the production capacity of each ultra-short radius horizontal well in the obtained first set D is evaluated, and it is determined whether the final ultra-short radius horizontal well optimization design scheme is reasonable, and in the process of determining, it is necessary to perform single-point production capacity evaluation and overall production capacity evaluation, where the capacity includes quality M and efficiency E.
Specifically, in this embodiment, for the i-th ultra-short radius horizontal well Ai, a standard production capacity C0i is set, an actual production quality Mi and an actual production efficiency Ei of the i-th ultra-short radius horizontal well Ai are obtained, where i=1, 2..n, single-point production capacity evaluation is performed for the i-th ultra-short radius horizontal well Ai, an actual production capacity Ci of the i-th ultra-short radius horizontal well Ai is calculated,
Ci＝a×Mi+b×Ei，
a is a first weight coefficient of the actual exploitation quality Mi to the actual exploitation capability Ci, b is a second weight coefficient of the actual exploitation efficiency Ei to the actual exploitation capability Ci, and the values of the standard exploitation capability C0i are different according to the different design positions of the ultra-short radius horizontal well;
calculating a first difference absolute value Si, si= |Ci-C0i|,
if Si is less than or equal to S0i, judging that the actual exploitation capacity of the ith ultrashort radius horizontal well Ai is moderate, and performing secondary exploitation;
if Si is greater than S0i and Ci is less than C0i, judging that the actual exploitation capability of the ith ultrashort radius horizontal well Ai is weak, and obtaining three-stage exploitation;
if Si is more than S0i and Ci is more than C0i, judging that the actual exploitation capability of the i-th ultra-short radius horizontal well Ai is strong, and obtaining primary exploitation;
the S0i is a mining capability difference evaluation value of the ith ultra-short radius horizontal well Ai, the positions of the ultra-short radius horizontal well Ai are different, and the values of the mining capability difference evaluation value S0i are different.
And for the ultra-short radius horizontal wells at different positions, different standard exploitation capacity and exploitation capacity difference evaluation values are set, the exploitation condition of each ultra-short horizontal well can be well determined, the exploitation grade of each ultra-short radius horizontal well can be judged by analyzing the actual exploitation capacity of each ultra-short horizontal well, and data support is provided for improving the optimal design scheme of the ultra-short radius horizontal well, so that the exploitation efficiency is ensured.
In particular, in this embodiment, the actual production capacities of the plurality of ultra-short radius horizontal wells in the first set D are integrated, and it is determined whether the overall production capacity meets the requirement,
obtaining the number of ultra-short radius horizontal wells with the production capacity of the three-stage production and calculating a three-stage production score, obtaining the number of ultra-short radius horizontal wells with the production capacity of the one-stage production and calculating a one-stage production score, comprising,
1) Renumbering the number of the ultra-short radius horizontal wells extracted in three stages, namely a first three-stage point position A11, a second three-stage point position A12 … … and a third p-stage point position A1p, wherein p is less than or equal to n,
2) Renumbering the number of the ultra-short radius horizontal wells mined at one stage, namely a first-stage point position A21, a second-stage point position A22 … … and a first-q first-stage point position A2q, wherein q is less than or equal to n,
determining whether the overall production capacity of a plurality of ultra-short radius horizontal wells in the first set D meets the requirement, calculating the overall actual production capacity K, setting,
K＝∑ x q ＝1 Cx×Gx-∑ p y＝1 Cy×Fy
wherein Cx is the actual exploitation capacity of the first-level point position A2x of the first x, gx is the first calculation compensation parameter of the actual exploitation capacity of the first-level point position A2x of the first x on the first-level exploitation score; cy is the actual exploitation capacity of the third-level point position A1y, fy is a second calculated compensation parameter of the actual exploitation capacity of the third-level point position A1y for grading the third-level exploitation, the value of the first calculated compensation parameter Gx is different according to the position of the ultra-short radius horizontal well, and the value of the second calculated compensation parameter Fy is different according to the position of the ultra-short radius horizontal well.
In particular, in this embodiment, according to the overall actual production capacity K and the set scheme level evaluation interval H, h= [ K0min, K0max ], the scheme level of the final ultra-short radius horizontal well optimization design scheme is determined,
if K is more than or equal to K0max, judging that the final ultra-short radius horizontal well optimal design scheme is a first-class scheme;
if K0min is less than K0max, judging that the final ultra-short radius horizontal well optimal design scheme is a class B scheme;
if K is less than or equal to K0min, judging that the final ultra-short radius horizontal well optimal design scheme is a third-level scheme;
wherein K0min is the minimum value in the scheme level evaluation section H, and K0max is the maximum value in the scheme level evaluation section H.
And the different three-level points and the first-level points are collected, the overall exploitation capacity of a plurality of ultra-short radius horizontal wells in the first set D is calculated integrally, data support is provided for judging the scheme level of the final ultra-short radius horizontal well optimal design scheme, and the exploitation efficiency is ensured.
Specifically, in this embodiment, when the final ultra-short radius horizontal well optimization design scheme is the first-class scheme, it is determined that the final ultra-short radius horizontal well optimization design scheme is reasonable in design, and the plurality of ultra-short radius horizontal wells in the second set D1 start to formally run according to the scheme;
when the final ultra-short radius horizontal well optimal design scheme is a level B scheme, judging that part of the final ultra-short radius horizontal well optimal design scheme is unreasonable in design, and carrying out corresponding rectifying measures on the scheme;
when the final ultra-short radius horizontal well optimal design scheme is a third-level scheme, the final ultra-short radius horizontal well optimal design scheme is judged to be unreasonable to design, and the scheme is redesigned.
According to the method, according to the determined optimal design scheme of the final ultra-short radius horizontal well, the part of the ultra-short radius horizontal wells in the scheme are subjected to exploitation test operation, the ultra-short radius horizontal wells subjected to test operation are subjected to single-point exploitation capability assessment and overall exploitation capability assessment, the exploitation grades of the ultra-short horizontal wells are determined according to the single-point exploitation capability assessment, the exploitation scores of the ultra-short radius horizontal wells under different exploitation grades are calculated according to the different exploitation grades, the overall actual exploitation capability is calculated according to the exploitation scores of the different grades, so that the scheme grade of the optimal design scheme of the final ultra-short radius horizontal well and specific measures under different scheme grades are determined, whether the scheme design is reasonable or not can be timely found through carrying out exploitation test operation and assessment on the part of the ultra-short radius horizontal wells, the later accident caused by unreasonable scheme design and the potential problem and risk found before the formal operation of the whole ultra-short radius horizontal wells are avoided, and the optimization and improvement are timely carried out, and therefore the cost and the risk are reduced, and the exploitation efficiency of the ultra-short radius horizontal well is improved.
The invention further provides a specific embodiment of the invention by taking PB3 broken blocks of Daqing grape flowery oil field as examples, and provides an ultra-short radius horizontal well design method of PB3 broken blocks, which comprises the following steps of,
step S1, identifying 241 interlayers by comprehensively analyzing a logging curve, a core and interlayer identification standards, wherein the 241 interlayers comprise 213 argillaceous interlayers, 17 calcareous interlayers and 11 physical interlayers;
step S2, further splitting the thick sand layer by using an interlayer, readjusting the microphase type, and carrying out fine depiction on the sand body between wells by combining earthquake inversion sandstone prediction to finish the well earthquake combined sediment phase depiction;
step S3, selecting a phase control modeling idea, establishing geologic models such as fine sediment microphases, attributes and the like of the sand body by modeling means such as deterministic simulation, sequential indication simulation, truncated Gaussian simulation and the like, and engraving out structural features, microphases types, thickness distribution and attribute parameters of the sand body;
step S4, carrying out fine numerical simulation on the basis of a three-dimensional geological model, and quantitatively describing the distribution characteristics of residual oil in the sand body;
and S5, based on PB3 fault block residual oil description results, selecting a 1-mouth fault edge part residual oil ultra-short radius horizontal well D0660800.
Specifically, in this embodiment, in order to improve the prediction accuracy of the reservoir property parameters between wells, the reservoir parameter model is established by adopting a phased random modeling technology, and after the property parameters are normally transformed, a sequential gaussian simulation method is adopted to establish a porosity, permeability, saturation and net-to-gross ratio model.
In particular, the PB3 broken block residual geological reserves of the embodiment are mainly concentrated in river channels and sand-like sand bodies, and by counting 3 main types of residual oil potential, including multi-stage river channel types, branched river channel types and sand-like sand types,
the multi-stage river sand body residual oil is mainly concentrated at the positions of staggered river superposition, lump superposition and narrow river channels, and accounts for 80.19% of the total residual oil reserve;
the molding sand body residual oil of the branched river channel is mainly enriched at the turnout junction, the river variation part and the narrow river channel part, and accounts for 95.40% of the total residual oil storage;
the residual oil of the sand-like sand molding sand body is mainly enriched in the positions of main body sand-like sand, main body variation and sheet-like thin difference layer, and accounts for 94.75% of the total residual oil storage.
Specifically, according to different well region sand body types, potential positions, internal construction and heterogeneity, and well pattern configuration relations, the embodiment qualitatively analyzes the influence factors of the residual oil, wherein the residual oil types mainly can be divided into 5 types of gravity separation, mud wedge shielding, plane contradiction, sand body edge and fault edge, the total proportion of the gravity separation type and mud wedge shielding residual oil is up to 62.65%, and the residual oil is the most main 2 residual oil types in the region.
Specifically, the embodiment is based on PB3 fault block residual oil description results, preferably 1 fault edge part residual oil ultra-short radius horizontal well D0660800, the well is totally shot with 9 small layers, shot sandstone thickness is 18.8m, effective thickness is 14.8m, 1 water injection well is shared in a well group, injection well distance is 390m, well development layers are all located in a fault lower disc, the top surface and the fault distance are 8m and 5m respectively, and the bottom surface and the fault distance are 45m and 47m respectively.
In particular, the present embodiment analyzes according to the 1-mouth fault edge type residual oil ultra-short radius horizontal well D0660800, including,
production condition analysis: the well is put into production in 6 months of 1998, the daily production liquid in the initial stage of production is 2.9t, the daily production oil is 2.0t, and the water content is 32.4%; 2.1t of daily production liquid, 0.2t of daily oil, 90.5% of water, 1.01×104t of accumulated oil and 28.2% of geological reserve are shut in 6 months of 2019;
and (3) injection and production condition analysis: the well is positioned at the fault edge, and from the plane communication relation, only 1 water injection well D0650080 is arranged around the well, and the communication is poor;
analysis of oil layer usage status: from the oil saturation distribution diagram of each deposition unit, the oil saturation of 9-10 units is 58.5%, the residual geological reserve is 1.11 multiplied by 104t, and the residual oil is more enriched and belongs to the fault side part residual oil.
Specifically, the embodiment designs the ultra-short radius horizontal well D0660800 of the residual oil at the side part of the 1-mouth fault according to the analysis results, which comprises,
the scheme is as follows: combining the sand spreading and surrounding injection and production conditions, and designing an azimuth angle 201.15 degrees; designing a target front distance of 60m and a drilling horizontal section length of 150m; meanwhile, in view of more passing layers at the upper part of the well, well cementation completion and sectional perforation are adopted after the whole well is drilled, and production is put into operation;
single well trajectory design: according to the structural characteristics and the development thickness of the reservoir, the horizontal section is positioned at the upper middle part of the No. 9 sandstone; meanwhile, the stratum in the drilling direction of the well is inclined upwards, the target point view inclination angle of the horizontal section A is designed to be-0.36 degrees, and the well inclination angle is adjusted in time according to the change of the azimuth and the stratum inclination angle in the drilling process of the horizontal section so as to avoid layer discharge.
According to the embodiment of the invention, the interlayer inside the sand body is identified through comprehensive analysis of the logging curve, the core and the interlayer identification standard; further splitting the thick sand layer by using an interlayer, and carrying out fine characterization on the sand bodies among the wells by combining earthquake inversion sandstone prediction to finish well earthquake combined deposition characterization; establishing a sand body fine geological model according to the fine depiction of the inter-well sand body; carrying out fine numerical simulation on the basis of the established three-dimensional geological model, quantitatively describing the distribution characteristics of residual oil in the sand body, predicting the digging effect through numerical simulation, and determining the final ultra-short radius horizontal well optimization design scheme; aiming at the problem that the description precision of oil reservoirs in the oil field is required to be further improved in the technology of the ultra-short radius horizontal well in the later period of oil field development, the technology of fine description of the oil reservoirs in the narrow-thin sand body oil field sand body is developed, the ultra-short radius horizontal well is optimally designed on the basis, the measure mining effect is guaranteed to the maximum extent, and the recovery ratio in the later period of oil field development is improved.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.
The foregoing description is only of the preferred embodiments of the invention and is not intended to limit the invention; various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A design method of an ultra-short radius horizontal well is characterized by comprising the following steps of,
step S1, identifying an internal interlayer of the sand body through comprehensive analysis of a logging curve, a core and an interlayer identification standard;
step S2, further splitting the thick sand layer by using an interlayer, and carrying out fine depiction on the sand bodies among the wells by combining earthquake inversion sandstone prediction to finish the well earthquake combined deposition phase depiction;
step S3, establishing a sand body fine geological model according to fine depiction of the inter-well sand body;
step S4, carrying out fine numerical simulation on the basis of the three-dimensional geological model established in the step S3, quantitatively describing the distribution characteristics of the residual oil in the sand body, and determining the optimal design scheme of the final ultra-short radius horizontal well through numerical simulation prediction of the submerged arc effect;
step S5, performing trial run according to the determined optimal design scheme of the final ultra-short radius horizontal well, and judging whether the optimal design scheme is reasonable or not;
in step S5, single-point production capacity evaluation and overall production capacity evaluation are performed on each of the ultra-short radius horizontal wells that are in trial operation, production levels of each of the ultra-short radius horizontal wells are determined according to the single-point production capacity evaluation, production scores of the ultra-short radius horizontal wells under different production levels are calculated according to the different production levels, and overall actual production capacity is calculated according to the different production scores, so that a scheme level of the final ultra-short radius horizontal well optimal design scheme and specific measures under different scheme levels are determined.
2. The method of designing an ultra-short radius horizontal well according to claim 1,
dividing a plurality of ultra-short radius horizontal wells set in the final ultra-short radius horizontal well optimization design scheme, wherein the ultra-short radius horizontal wells in the first set are used for production test operation, and carrying out production capacity assessment according to the actual production capacity of each ultra-short radius horizontal well in the obtained test operation stage, and the production capacity assessment comprises single-point production capacity assessment and overall production capacity assessment.
3. The method of designing an ultra-short radius horizontal well according to claim 2, wherein the production level of the ultra-short radius horizontal well is determined by performing single point production capacity evaluation based on the obtained actual production capacity and a set standard production capacity,
under the condition that the mining grade of the ultra-short radius horizontal well is primary mining, the absolute value of a first difference value between the actual mining capacity and the standard mining capacity is larger than the mining capacity difference evaluation value, and the actual mining capacity is smaller than the standard mining capacity;
under the condition that the production grade of the ultra-short radius horizontal well is three-level production, the absolute value of the first difference between the actual production capacity and the standard production capacity is larger than the evaluation value of the difference of the production capacity, and the actual production capacity is larger than the standard production capacity.
4. The method for designing an ultra-short radius horizontal well according to claim 3, wherein the ultra-short radius horizontal well of the primary production and the ultra-short radius horizontal well of the tertiary production are obtained by integrating, including, a primary point location and a tertiary point location,
a first calculation compensation parameter of the primary mining scoring is set on the basis of the actual mining capacity of the primary point under the condition of calculating the primary mining scoring of the primary point;
and calculating a second compensation parameter of the three-level mining score on the basis of the actual mining capacity provided with the three-level point under the condition of calculating the three-level mining score under the three-level point.
5. The ultra-short radius horizontal well design method of claim 4, wherein the primary and tertiary production scores obtained calculate the overall actual production capacity K using the following formula:
K＝∑ x q ＝1 Cx×Gx-∑ p y＝1 Cy×Fy
wherein Cx is the actual mining ability of the first level x point location, gx is the first calculated compensation parameter for the actual mining ability of the first level x point location to score the first level mining; cy is the actual exploitation capacity of the third level point, fy is the second calculated compensation parameter of the third level point's actual exploitation capacity to the third level exploitation score.
6. The method of designing an ultra-short radius horizontal well according to claim 5,
based on the condition that the final ultra-short radius horizontal well optimal design scheme is a first-class scheme, the overall actual exploitation capacity exceeds the maximum value in a preset scheme class evaluation interval;
based on the condition that the final ultra-short radius horizontal well optimal design scheme is a second-level scheme, the overall actual exploitation capacity is within the allowable range of a preset scheme level evaluation interval;
and under the condition that the final ultra-short radius horizontal well optimal design scheme is a third-level scheme, the overall actual exploitation capacity is smaller than the minimum value in a preset scheme level evaluation interval.
7. The method of claim 6, wherein if the final ultra-short radius horizontal well optimization design is determined to be reasonable according to the overall actual production capacity, the ultra-short radius horizontal wells in the second set are started to run formally according to the design;
if the final ultra-short radius horizontal well optimization design scheme is judged to be unreasonable in design and is the level B scheme according to the overall actual exploitation capability, corresponding correction measures are made for the scheme;
and if the final ultra-short radius horizontal well optimal design scheme is judged to be unreasonable according to the overall actual exploitation capability and is the third-level scheme, the scheme is redesigned.
8. The method of designing an ultra-short radius horizontal well according to claim 1,
in the step S2 of the process of the present invention,
if the split thick sand layer belongs to the physical interlayer, the split sand body keeps consistent with the original phase type;
if the split thick sand layer belongs to the argillaceous interlayer or the calcareous interlayer, the split sand body is adjusted according to new well logging phase and adjacent well microphase type comprehensive analysis.
9. The method of designing an ultra-short radius horizontal well according to claim 1,
in step S3, the sand body is finely modeled, including,
establishing a layer model based on a model unit grid conversion technology and a sand vertical shaping technology;
constructing a fault model based on the constraint of seismic interpretation and layering;
wherein, the model unit grid conversion technology models the sand body by taking the top and the bottom of the sand body as layering and taking the small layers and the layer groups as layer group surfaces, so that the sand body model models the sand body on the vertical shelf under the common constraint of the thickness plane distribution of the sand body and the top and the bottom of the small layers,
the sand body vertical shaping technology is characterized in that a control method of a uniform thickness surface is adopted: and establishing a sand body bottom layer model by using a sand body thickness graph obtained by modeling software and an established sand body top layer model as constraints, wherein the top and bottom layer models are required to be overlapped together at a sand body pinch-out position and are matched with the actual spatial distribution of the sand body.
10. The method of designing an ultra-short radius horizontal well according to claim 1, wherein optimizing the ultra-short radius horizontal well design comprises optimizing a fault edge type residual oil design suitable for ultra-short radius horizontal well excavation, optimizing a gravity separation type residual oil design, and optimizing a mud wedge shielding type residual oil design.
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