Method and device for obtaining terrestrial facies shale horizontal well borehole trajectory layer crossing position

Abstract

The embodiment of the invention provides a method and device for obtaining the stratum penetrating position of a well track of a continental facies shale horizontal well. The method comprises the steps that geological parameters and engineering parameters of all small stratums of continental facies shale are obtained; hydraulic fracturing fracture morphological parameters are determined according to the geological parameters, the engineering parameters and the hydraulic fracturing process parameters; according to the hydraulic fracturing fracture morphological parameters, the propping agent stacking height of the continental facies shale under different horizontal well track layer penetrating positions is determined, and the supporting condition in the fracture height direction is evaluated according to the propping agent stacking height; and according to the hydraulic fracturing fracture morphological parameters and the supporting condition in the fracture height direction, the final horizontal well hole track layer penetrating position is determined. By means of the method, the high-quality borehole crossing position can be obtained and used for guiding drilling design and development of the continental facies shale horizontal well.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of drilling and oil production, in particular to a method and device for obtaining a horizontal well bore trajectory crossing position of a continental shale. BACKGROUND

[0002] The continental shale reservoirs in China are affected by the change of sedimentary environment, and overall present the characteristics of thin thickness of high-quality reservoir, multiple small layers, vertical multi-lithology combination, high interlayer stress and strong heterogeneity. The vertical small layers have large differences in geological parameters and engineering parameters, which have important influences on the horizontal well bore trajectory crossing position selection of the continental shale horizontal well, the horizontal well fracturing reconstruction and the development process.

[0003] The horizontal well bore trajectory crossing position is greatly affected by the vertical lithology, rock mechanics and ground stress, and has important influences on the fracture shape and fracturing reconstruction in the later stage. The existing technology mainly designs the well bore trajectory crossing according to the geometric characteristics, drillability and wellbore stability, but the vertical multi-lithology combination of the continental shale reservoirs leads to large differences in the geological parameters and engineering parameters between the vertical small layers, and there is a high stress barrier layer. In the hydraulic fracturing process, the fracturing cracks may not communicate with the high-quality shale small layers or the high-quality shale small layers, resulting in poor support effect and poor fracturing reconstruction effect of the multi-lithology combination continental shale reservoir, and the expected production target cannot be achieved. SUMMARY

[0004] The purpose of the embodiments of the present application is to provide a method and device for obtaining a horizontal well bore trajectory crossing position of a continental shale, which can obtain a high-quality well bore crossing position and be used for guiding the drilling design and development of the continental shale horizontal well.

[0005] In order to achieve the above purpose, the embodiments of the present application provide a method for obtaining a horizontal well bore trajectory crossing position of a continental shale, which comprises the following steps:

[0006] Obtaining the geological parameters and engineering parameters of each small layer of the continental shale;

[0007] Determining the hydraulic fracturing crack shape parameters according to the geological parameters, engineering parameters and hydraulic fracturing process parameters;

[0008] Determining the proppant accumulation height under the horizontal well bore trajectory crossing position of the continental shale according to the hydraulic fracturing crack shape parameters, and evaluating the support condition of the fracture height direction according to the proppant accumulation height;

[0009] Determining the final horizontal well bore trajectory crossing position according to the hydraulic fracturing crack shape parameters and the support condition of the fracture height direction.

[0010] Optionally, determining hydraulic fracturing crack morphology parameters according to the geological parameters, engineering parameters and hydraulic fracturing process parameters includes:

[0011] Constructing a continental shale hydraulic fracturing fracture propagation model based on the geological parameters, engineering parameters and hydraulic fracturing process parameters;

[0012] The hydraulic fracture propagation model is used to simulate the fracture morphology under different horizontal wellbore trajectory penetration conditions to obtain the hydraulic fracture morphology parameters under different horizontal wellbore trajectory penetration conditions;

[0013] The geological parameters include porosity, permeability and formation pressure of each sub-layer;

[0014] The engineering parameters include elastic modulus, Poisson's ratio, tensile strength and triaxial principal stress of each small layer;

[0015] The hydraulic fracturing process parameters include segmented and clustered perforation, operation displacement, operation scale, and liquid viscosity;

[0016] The hydraulic fracturing fracture morphological parameters include fracture height, longitudinal fracture width distribution and average fracture width under different horizontal wellbore trajectory penetration conditions.

[0017] Optionally, constructing a continental shale hydraulic fracturing fracture propagation model based on the geological parameters, engineering parameters, and hydraulic fracturing process parameters includes:

[0018] Interpretation and analysis of the geological parameters, engineering parameters and vertical distribution of each sub-layer are performed to obtain interpretation data, wherein the interpretation data includes vertical lithological characteristics and thickness changes, and vertical changes of geological parameters and engineering parameters;

[0019] The continental shale hydraulic fracturing fracture propagation model is constructed based on the interpretation data and hydraulic fracturing process parameters.

[0020] Optionally, determining the proppant accumulation height at different wellbore trajectory penetration positions of the continental shale according to the hydraulic fracturing fracture morphology parameters includes:

[0021] Obtaining the hydraulic fracture morphology parameters under the condition that the wellbore trajectory can penetrate the high-quality shale layer;

[0022] Determine the proppant stacking height in the fracture height direction under the penetration layer of different horizontal wellbore trajectories that can connect the high-quality shale layer according to the hydraulic fracturing fracture morphology and construction parameters;

[0023] The construction parameters include construction displacement, liquid viscosity, proppant particle size and sand addition concentration.

[0024] Optionally, the determining the final horizontal well borehole trajectory position according to the hydraulic fracture crack shape parameters and the support condition of the fracture height direction comprises:

[0025] determining the fracture height expansion condition according to the hydraulic fracture crack shape parameters under the different borehole trajectory positions;

[0026] determining the horizontal well borehole trajectory position and the support fracture height condition capable of communicating the high-quality shale sublayer according to the fracture height expansion condition, and determining the borehole trajectory position capable of completely supporting the high-quality shale sublayer;

[0027] determining the final horizontal well borehole trajectory position by comparing all the borehole trajectory positions capable of fracturing, communicating and supporting the high-quality shale sublayer.

[0028] In another aspect, the application further provides a device for obtaining a horizontal well borehole trajectory position of a continental shale, which comprises:

[0029] a obtaining module, configured to obtain geological parameters and engineering parameters of each sublayer of the continental shale;

[0030] a first processing module, configured to determine hydraulic fracture crack shape parameters according to the geological parameters, the engineering parameters and hydraulic fracturing process parameters;

[0031] a second processing module, configured to determine a support agent accumulation height under the different horizontal well borehole trajectory positions of the continental shale according to the hydraulic fracture crack shape parameters, and evaluate a support condition of a fracture height direction according to the support agent accumulation height;

[0032] a third processing module, configured to determine a final horizontal well borehole trajectory position according to the hydraulic fracture crack shape parameters and the support condition of the fracture height direction.

[0033] Optionally, the determining the hydraulic fracture crack shape parameters according to the geological parameters, the engineering parameters and the hydraulic fracturing process parameters comprises:

[0034] constructing a hydraulic fracture crack expansion model of the continental shale according to the geological parameters, the engineering parameters and the hydraulic fracturing process parameters;

[0035] simulating the hydraulic fracture crack shape under different horizontal well borehole trajectory conditions according to the hydraulic fracture crack expansion model, to obtain the hydraulic fracture crack shape parameters under the different horizontal well borehole trajectory conditions;

[0036] the geological parameters comprise porosity, permeability and formation pressure of each sublayer;

[0037] the engineering parameters comprise elastic modulus, Poisson's ratio, tensile strength and three principal stresses of each sublayer.

[0038] The hydraulic fracturing process parameters include segmented cluster perforation, construction discharge, construction scale, and liquid viscosity.

[0039] The hydraulic fracturing fracture morphology parameters include fracture height, longitudinal fracture width distribution, and average fracture width under different horizontal wellbore trajectory crossing layer conditions.

[0040] Optionally, the constructing the continental shale hydraulic fracturing fracture propagation model according to the geological parameters, engineering parameters, and hydraulic fracturing process parameters comprises:

[0041] The interpretation data include longitudinal lithology characteristics and thickness variation, and longitudinal variation of geological parameters and engineering parameters, by interpreting and analyzing the geological parameters, engineering parameters, and longitudinal small layer distribution.

[0042] The continental shale hydraulic fracturing fracture propagation model is constructed according to the interpretation data and hydraulic fracturing process parameters.

[0043] Optionally, the determining the proppant accumulation height under the horizontal wellbore trajectory crossing layer position of the continental shale according to the hydraulic fracturing fracture morphology parameters comprises:

[0044] The hydraulic fracturing fracture morphology parameters under the wellbore trajectory crossing layer condition in which the fracture can communicate with the high-quality shale small layer are obtained.

[0045] The proppant accumulation height under the fracture height direction of the different horizontal wellbore trajectory crossing layers which can communicate with the high-quality shale small layer is determined according to the hydraulic fracturing fracture morphology and construction parameters.

[0046] The construction parameters include construction discharge, liquid viscosity, proppant particle size, and sand concentration.

[0047] Optionally, the determining the final horizontal wellbore trajectory crossing layer position according to the hydraulic fracturing fracture morphology parameters and the proppant accumulation under the fracture height direction comprises:

[0048] The fracturing fracture height propagation is determined according to the hydraulic fracturing fracture morphology parameters under the different wellbore trajectory crossing layers.

[0049] The horizontal wellbore trajectory crossing layer position and the propped fracture height condition which can communicate with the high-quality shale small layer are determined according to the fracturing fracture height propagation, and the wellbore trajectory crossing layer position which can completely support the high-quality shale small layer is determined.

[0050] The final horizontal wellbore trajectory crossing layer position is determined by comparing all the wellbore trajectory crossing layer positions which can fracture, communicate, and support the high-quality shale small layer.

[0051] The present invention provides a method for obtaining the penetration position of a horizontal wellbore trajectory in continental shale, comprising: obtaining geological parameters and engineering parameters of each sublayer of the continental shale; determining hydraulic fracture morphology parameters based on the geological parameters, engineering parameters, and hydraulic fracturing process parameters; determining proppant accumulation heights at different horizontal wellbore trajectory penetration positions of the continental shale based on the hydraulic fracture morphology parameters, and evaluating the support situation in the fracture height direction based on the proppant accumulation height; and determining the final horizontal wellbore trajectory penetration position based on the hydraulic fracture morphology parameters and the support situation in the fracture height direction. The present invention determines the optimal wellbore trajectory penetration position by evaluating the hydraulic fracture morphology parameters and the support situation in the fracture height direction under different wellbore trajectory penetration conditions, which is used to guide the drilling design and development of continental shale horizontal wells, thereby achieving the purpose of improving the fracturing transformation effect and enhancing the development effect of continental shale reservoirs.

[0052] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following detailed description, they are used to explain the embodiments of the present invention, but do not constitute a limitation of the embodiments of the present invention. In the accompanying drawings:

[0054] Figure 1 The present invention provides a flow chart of a method for obtaining the wellbore trajectory penetration position of a continental shale horizontal well;

[0055] Figures 2a-2e It is a schematic diagram of reservoir barriers with different lithologies;

[0056] Figures 3a-3e This is a schematic diagram of the vertical accumulation of proppant considering the expansion of fracturing cracks under different wellbore trajectory penetration conditions in multi-lithologic continental shale.

[0057] Description of Reference Numerals

[0058] 1- Upper compartment,

[0059] 2- The first small layer,

[0060] 3- The second small layer,

[0061] 4- The third small layer,

[0062] 5- The fourth small layer,

[0063] 6- The fifth small layer,

[0064] 7-Lower compartment. DETAILED DESCRIPTION

[0065] The following describes the specific implementation of the embodiment of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the embodiment of the present invention and is not used to limit the embodiment of the present invention.

[0066] Example 1

[0067] Figure 1 The present invention provides a flow chart of a method for obtaining the wellbore trajectory penetration position of a continental shale horizontal well. Figure 1 As shown, a method for obtaining the wellbore trajectory penetration position of a continental shale horizontal well of the present invention includes:

[0068] Step S101 is to obtain geological parameters and engineering parameters of each sub-layer of continental shale.

[0069] Specifically, the continental shale mainly targets combined lithologic continental shale, which has many small layers, diverse lithologic combinations such as shale, sandstone, and gray interlayers, and large differences in vertical geological engineering parameters. Under different wellbore trajectory penetration conditions, there are problems such as difficulty in communicating high-quality shale fracturing fractures or poor support effect of high-quality shale reservoirs due to fracturing fractures.

[0070] The geological parameters are vertical sub-layer geological parameters, including porosity, permeability, and formation pressure of each sub-layer, vertical lithologic variations, and thickness characteristics. Based on the characteristics of continental shale reservoirs, regional geological analysis, geophysical interpretation, and well logging interpretation of similar reservoirs in adjacent wells are used to study the distribution characteristics of regional reservoirs and clarify the vertical and horizontal distribution characteristics and variation patterns of the target reservoirs. The vertical lithologic variations include lithologic variation patterns and thickness variations.

[0071] The engineering parameters are engineering parameter characteristic evaluation and analysis, including elastic modulus, Poisson's ratio, tensile strength and triaxial principal stress, etc., which are used to determine the overall reservoir characteristics, total reservoir thickness, upper and lower interlayer characteristics of the target well area, and refine the distribution of each sub-layer of the target reservoir, sub-layer thickness, and lithologic variation patterns.

[0072] Step S102 is to determine the hydraulic fracturing fracture morphology parameter according to the geological parameter, the engineering parameter and the hydraulic fracturing process parameter; specifically, the determination of the hydraulic fracturing fracture morphology parameter according to the geological parameter, the engineering parameter and the hydraulic fracturing process parameter comprises: constructing a continental shale hydraulic fracturing fracture propagation model according to the geological parameter, the engineering parameter and the hydraulic fracturing process parameter; simulating the fracturing fracture morphology under the conditions of different horizontal well borehole trajectory penetrating layers according to the hydraulic fracturing fracture propagation model to obtain the hydraulic fracturing fracture morphology parameter under the conditions of different horizontal well borehole trajectory penetrating layers; the geological parameter comprises the porosity, the permeability and the formation pressure of each small layer; the engineering parameter comprises the elastic modulus, the Poisson's ratio, the tensile strength and the three principal stresses of each small layer; the hydraulic fracturing process parameter comprises segmented cluster perforation, construction discharge, construction scale, liquid viscosity; the hydraulic fracturing fracture morphology parameter comprises the fracture height, the longitudinal fracture width distribution and the average fracture width under the conditions of different horizontal well borehole trajectory penetrating layers.

[0073] The construction of the continental shale hydraulic fracturing fracture propagation model according to the geological parameter, the engineering parameter and the longitudinal distribution of each small layer comprises: obtaining interpretation data by interpreting and analyzing the geological parameter, the engineering parameter and the longitudinal distribution of each small layer, wherein the interpretation data comprises the longitudinal lithological characteristics and thickness variation, the longitudinal variation of the geological parameter and the engineering parameter; constructing the continental shale hydraulic fracturing fracture propagation model according to the interpretation data and the hydraulic fracturing process parameter.

[0074] According to the distribution of the mechanics of each small layer and the horizontal minimum principal stress, further coarse analysis of the small layer is performed. Specifically, the finite element numerical simulation method is used to construct a horizontal well cluster fracturing fracture propagation model, including the geometric characteristics of each different lithology and small layer subdivision result in the longitudinal direction.

[0075] Step S103 is to determine the proppant accumulation height of the continental shale under the conditions of different horizontal well borehole trajectory penetrating layers according to the hydraulic fracturing fracture morphology parameter, and to evaluate the proppant accumulation height in the fracture height direction.

[0076] Specifically, the determination of the proppant accumulation height of the continental shale under the conditions of different horizontal well borehole trajectory penetrating layers according to the hydraulic fracturing fracture morphology parameter comprises: obtaining the hydraulic fracturing fracture morphology parameter under the conditions of the well borehole trajectory penetrating layers that can communicate the high-quality shale small layer; determining the proppant accumulation height in the fracture height direction under the conditions of different horizontal well borehole trajectory penetrating layers that can communicate the high-quality shale small layer according to the hydraulic fracturing fracture morphology and the construction parameter; the construction parameter comprises the construction discharge, the liquid viscosity, the proppant particle size and the sand concentration.

[0077] Evaluating the fracture height support based on the proppant accumulation height specifically includes determining the fracture height extension based on the hydraulic fracture morphology parameters of the different wellbore trajectories. Based on the fracture connectivity, the wellbore trajectory penetration locations that can connect to high-quality shale layers are initially optimized. For locations where the hydraulic fracture height cannot connect to high-quality shale layers, subsequent proppant fracture height analysis is not performed.

[0078] Step S104 is to determine the final horizontal wellbore trajectory penetration position based on the hydraulic fracture morphology parameters and the support situation in the fracture height direction. The determination of the final horizontal wellbore trajectory penetration position based on the hydraulic fracture morphology parameters and the support situation in the fracture height direction includes: determining the fracture height expansion situation based on the hydraulic fracture morphology parameters under different wellbore trajectory penetration situations; determining the horizontal wellbore trajectory penetration position and the support fracture height situation that can connect the high-quality shale layer based on the hydraulic fracture height expansion situation, and determining the wellbore trajectory penetration position that can fully support the high-quality shale layer; and determining the final horizontal wellbore trajectory penetration position by comparing all wellbore trajectory penetration positions that can connect the high-quality shale layer and the proppant-supported high-quality shale layer.

[0079] The hydraulic fracturing fracture morphology parameters include fracture height, longitudinal fracture width distribution, and average fracture width under different horizontal wellbore trajectory penetration conditions. Based on the fracture morphology under the conditions of wellbore trajectory penetration that can connect to high-quality shale layers, the fracture morphology (including fracture height, average fracture width, and fracture height profile) is obtained; the parameters of the fracturing process are obtained: construction displacement, liquid viscosity, proppant particle size, and sand addition concentration; and the propped fracture height is obtained (the Babcobc model can be used to calculate the maximum propped fracture height). The formula is as follows:

[0080]

[0081] Where Q is the pump displacement, m 3 / s; H is the height of the sand bank, m; H eq is the height of the balanced sand bank (i.e., the support fracture height), m; h is the height of the fluid flow area in the fracture, m; h eq The height of the fluid flow area corresponding to the equilibrium height of the sand bank, m; ν is the flow velocity of the sand-carrying fluid, m / s; ν eq is the equilibrium flow rate of the sand mixing fluid, m / s; ν s is the final settling velocity of the particles, m / s; ( w ) eq is the friction velocity at equilibrium, m / s; w is the width of the fracture, m; r H is the hydraulic radius, m; k′ is a custom constant, dimensionless; t is time, s; Add sand to sand ratio, decimal; μ is liquid viscosity, mPa.s; ds Diameter of proppant particle, m; p l Density of sand-carrying fluid, kg / m 3 ; p s Density of proppant, kg / m 3 a, b, c are constants.

[0082] According to a specific embodiment, based on the proppant support fracture height results under different wellbore trajectory through layer conditions, the support of the fracture height of the high-quality shale sublayer is evaluated; based on the support fracture height feature evaluation of the high-quality shale sublayer, the support effect is sorted. The support feature of the fracture height direction of the fracture propagation characteristics of the multi-lithology combined type continental shale is determined, the fracture height propagation and support fracture height analysis results under different wellbore trajectory through layer conditions of the multi-lithology combined type continental shale are targeted, the wellbore trajectory through layer effect is sorted, the wellbore trajectory through layer position is optimized, and the optimal continental shale horizontal well wellbore trajectory through layer position is determined. According to the sorted and optimized wellbore through layer position range of the target well, the continental shale horizontal well drilling design is guided.

[0083] The method couples the geological parameters and engineering parameter characteristics of each sublayer of the combined lithology continental shale, evaluates the fracture morphology, especially the fracture height propagation characteristics and support fracture height parameters under different horizontal well wellbore trajectory through layer position conditions, performs reverse design of the horizontal well wellbore through layer position for the high-quality shale sublayer fracturing reconstruction effect, and finally determines the optimal wellbore trajectory through layer position of the combined lithology continental shale.

[0084] The application can optimize the wellbore trajectory through layer according to the longitudinal geological engineering parameters and the fracturing fracture morphology, further reduce the subsequent fracturing reconstruction difficulty, increase the fracturing reconstruction effect, and achieve the purpose of improving the development effect of the target well. The method can be used not only for continental shale reservoirs but also for other unconventional oil and gas reservoirs with interbeds, and can be used to guide the design of the horizontal well wellbore trajectory through layer position of different types of unconventional oil and gas reservoirs.

[0085] Example two

[0086] According to the characteristics of the continental shale reservoir of a certain block, combined with geological analysis, drilling and logging core display, geophysical interpretation, logging interpretation results, etc., it is determined that the continental shale of the target block contains five sublayers, and the reservoir is surrounded by dense sandstone interlayers. According to the characteristics of the five sublayers, the fracture height of the five sublayers is calculated, and the fracture height of the five sublayers is calculated. Figures 2a-2eAs shown, the continental shale includes an upper barrier layer 1, a first sublayer 2, a second sublayer 3, a third sublayer 4, a fourth sublayer 5, a fifth sublayer 6, and a lower barrier layer 7. The upper barrier layer 1 is composed of dense sandstone; the first sublayer 2 is composed of shale; the second sublayer 3 is composed of shale; the third sublayer 4 is composed of sandy shale; the fourth sublayer 5 is composed of gray sandstone; the fifth sublayer 6 is composed of shale; and the lower barrier layer 7 is composed of dense sandstone.

[0087] Combined with the drilling and logging analysis results of the pilot wells or vertical wells in the area around the target design well, Figures 2a-2e and Figures 3a-3e The distribution of the upper and lower interlayers is analyzed as shown. Upper interlayer 1 is dense sandstone, with an overall thickness of 20-30 meters. Lower interlayer 7 is dense sandstone, with a thickness of 25-30 meters. First sublayer 2 is the target reservoir's shale layer, 3-4 meters thick. The shale mineral composition of first sublayer 2 contains a certain proportion of quartz. Second sublayer 3 is the target reservoir's shale layer, 8-10 meters thick. Third sublayer 4 is sandy shale, 2.2-3.2 meters thick. Fourth sublayer 5 is a limy sandstone reservoir, a high-stress barrier, 1.5-2.6 meters thick. Fifth sublayer 6 is shale, 7.8-8.6 meters thick. Based on the geological and engineering parameter characteristics of the target reservoir, second sublayer 3 is the optimal shale reservoir.

[0088] Based on the vertical reservoir lithologic characteristics of the pilot well of the target design well or the nearest vertical well adjacent to it, combined with experimental testing or geophysical interpretation results, the geo-engineering parameters of the target reservoir, upper and lower barriers, and all sub-layers are calculated and analyzed. The geological parameters obtained include porosity, permeability, and formation pressure, and the engineering parameters include elastic modulus, Poisson's ratio, tensile strength, and triaxial principal stress. Based on the vertical reservoir-barrier geo-engineering parameter characteristics, the quality characteristics of the sub-layers are further analyzed, and the differences in the geo-engineering parameters of the sub-layers and reservoirs at different vertical locations are compared to guide subsequent simulation analysis. At the same time, the geo-engineering parameters of the upper and lower barriers are calculated based on well logging data. Based on the rock mechanics and the distribution of the horizontal minimum principal stress of each vertical sub-layer, further coarsening analysis of the sub-layers is carried out to facilitate the establishment of the subsequent fracture propagation model.

[0089] Based on the characteristics of multi-lithologic composite continental shale reservoirs, regional vertical reservoir sub-layer characteristics analysis, and interpretation of vertical lithologic and geotechnical parameters for composite shale, a horizontal well clustered fracture height expansion model (i.e., a hydraulic fracturing fracture expansion model) was constructed. The model includes seven major sub-layers, whose geometric characteristics were further refined based on geotechnical and engineering parameter characteristics. Models were constructed for different sub-layer wellbore trajectory penetration conditions to facilitate subsequent simulation of fracture height expansion under different wellbore trajectory penetration conditions.

[0090] The seven sub-layers are assigned different geological engineering parameters, and the geological engineering parameters of the sub-layers are further refined and assigned according to the measured geological engineering parameter characteristics of the sub-layers. The related parameters mainly include porosity, permeability, elastic modulus, Poisson's ratio, tensile strength, three principal stresses and other parameters. After the model geometric feature division, differentiated geological-engineering parameter assignment, grid division and simulation step setting, the fracture morphology and height extension under different well trajectory crossing layer conditions are simulated to obtain the fracture extension characteristics and fracture height, fracture width and other fracture parameter characteristics under different well trajectory crossing layer conditions.

[0091] Figure 2a The fracture height extension map of the well trajectory crossing the first sub-layer 2, the fracture height can communicate the best quality sub-layer, and the communication effect of the overall reservoir is relatively poor. Figure 2b The fracture height extension map of the well trajectory crossing the second sub-layer 3, the fracture height can communicate the first sub-layer 2 to the fourth sub-layer 5. Figure 2c The fracture height extension map of the well trajectory crossing the third sub-layer 4, the fracture height can communicate the first sub-layer 2 to the fifth sub-layer 6, and the fracture height extension morphology can basically communicate all the sub-layers. Figure 2d The fracture height extension map of the well trajectory crossing the fourth sub-layer 5, the fracture height communicates the second sub-layer 3 to the fifth sub-layer 6, but the communication effect of the high-quality reservoir second sub-layer 3 is poor. Figure 2e The fracture height extension map of the well trajectory crossing the fifth sub-layer 6, the fracture height communicates the second sub-layer 3 to the fifth sub-layer 6, but the communication effect of the high-quality reservoir second sub-layer 3 is poor.

[0092] According to the fracture height extension simulation under different well trajectory crossing layer conditions, the fracture of the well trajectory crossing the second sub-layer 3, the third sub-layer 4 and the fourth sub-layer 5 can communicate the high-quality second sub-layer 3. Based on the fracture communication, the well trajectory crossing layer position capable of communicating the high-quality sub-layer is preliminarily optimized. For the crossing layer position where the fracture height cannot communicate the high-quality sub-layer, the subsequent proppant fracture height accumulation analysis is not performed.

[0093] According to Figures 2a-2e The fracture height extension results shown in FIG. 9 are obtained, and the fracture height size under different well trajectory crossing layer conditions is obtained, including the longitudinal fracture height, the fracture width and the fracture height profile parameters. According to the fracture height, the average fracture width and the fracture width profile data under different well trajectory crossing layer conditions, the proppant supporting fracture height under the fracture height scale condition is determined. Specifically, based on the fracture morphology of the well trajectory crossing layer condition capable of communicating the high-quality shale sub-layer, the fracture morphology under this condition is obtained, including the fracture height, the average fracture width and the fracture height profile morphology. Based on the fracture construction process, the construction discharge, the liquid viscosity, the proppant particle size and the sand concentration and other parameters are obtained. The Babcobc model is used to determine the proppant fracture height determination, and the calculation of the propped fracture height of the fracture is performed. The determined propped fracture height distribution is shown in FIG. 10. Figures 3a-3e The fracture height extension results shown in FIG. 9 are obtained, and the fracture height size under different well trajectory crossing layer conditions is obtained, including the longitudinal fracture height, the fracture width and the fracture height profile parameters. According to the fracture height, the average fracture width and the fracture width profile data under different well trajectory crossing layer conditions, the proppant supporting fracture height under the fracture height scale condition is determined. Specifically, based on the fracture morphology of the well trajectory crossing layer condition capable of communicating the high-quality shale sub-layer, the fracture morphology under this condition is obtained, including the fracture height, the average fracture width and the fracture height profile morphology. Based on the fracture construction process, the construction discharge, the liquid viscosity, the proppant particle size and the sand concentration and other parameters are obtained. The Babcobc model is used to determine the proppant fracture height determination, and the calculation of the propped fracture height of the fracture is performed. The determined propped fracture height distribution is shown in FIG. 10. Figure 3a The support fracture height accumulation result map of the wellbore trajectory through the first sublayer 2, and the proppant can support the second sublayer 3. Figure 3b The support fracture height accumulation result map of the wellbore trajectory through the second sublayer 3, and the proppant can support the second sublayer 3 to the fourth sublayer 5. Figure 3c The support fracture height accumulation result map of the wellbore trajectory through the third sublayer 4, and the fracture height can communicate the second sublayer 3 to the fifth sublayer 6. Figure 3d The support fracture height accumulation result map of the wellbore trajectory through the fifth sublayer 6, and the fracture height communicates the third sublayer 4 to the fifth sublayer 6, and the second sublayer 3 is not supported by the proppant. Figure 3e The support fracture height accumulation result map of the wellbore trajectory through the fifth sublayer 6, and the proppant can accumulate the fourth sublayer 5 to the fifth sublayer 6.

[0094] According to the support fracture height accumulation effect, under the conditions of the wellbore trajectory through the first sublayer 2, the second sublayer 3 and the third sublayer 4, the support fracture height of the proppant can effectively support the second sublayer 3. Overall, based on the support effect ranking, the wellbore trajectory through the first sublayer 2 is greater than the wellbore trajectory through the second sublayer 3, which is greater than the wellbore trajectory through the third sublayer 4.

[0095] According to the analysis results of the fracture propagation and the support fracture height under the conditions of the wellbore trajectory through different sublayers of the multi-lithology combination type continental shale, the wellbore trajectory through the second sublayer 3 and the third sublayer 4 is the best, and the drilling wellbore through the sublayer is the second sublayer 3 and the third sublayer 4.

[0096] Example three

[0097] In another aspect, the application provides a device for obtaining a position of a wellbore trajectory through a sublayer of a horizontal well of continental shale, the device comprising: an obtaining module for obtaining geological parameters and engineering parameters of each sublayer of the continental shale; a first processing module for determining a hydraulic fracture shape parameter according to the geological parameters, the engineering parameters and a hydraulic fracturing process parameter; a second processing module for determining a proppant accumulation height under different positions of the wellbore trajectory through the sublayer of the horizontal well of the continental shale according to the hydraulic fracture shape parameter, and evaluating a support condition of a fracture height direction according to the proppant accumulation height; and a third processing module for determining a final position of the wellbore trajectory through the sublayer of the horizontal well according to the hydraulic fracture shape parameter and the support condition of the fracture height direction.

[0098] The method comprises the following steps: acquiring geological parameters and engineering parameters of each small layer of the continental shale; determining a hydraulic fracturing fracture morphology parameter according to the geological parameters, the engineering parameters and a hydraulic fracturing process parameter; and determining a support agent accumulation height of the continental shale under different horizontal well bore trajectory layer-penetrating positions according to the hydraulic fracturing fracture morphology parameter, and evaluating a support condition of a fracture height direction according to the support agent accumulation height.

[0099] The device determines a preferred bore trajectory layer-penetrating position by evaluating the hydraulic fracturing fracture morphology parameter and the support condition of the fracture height direction under different bore trajectory layer-penetrating conditions, and is used for guiding drilling design and development, so that the fracturing reconstruction effect is improved, and the development effect of the continental shale reservoir is improved.

[0100] Embodiment four

[0101] The application further provides a drilling layer-penetrating method, which comprises the following steps: determining a bore trajectory layer-penetrating position according to the method for acquiring the bore layer-penetrating position; determining a reservoir horizontal well bore trajectory drilling layer-penetrating position according to the bore trajectory layer-penetrating position; and developing the continental shale reservoir according to the reservoir small layer drilling layer-penetrating position. The method can greatly improve the development effect of a target well.

[0102] The application provides a method for acquiring a bore trajectory layer-penetrating position of a continental shale horizontal well, which comprises the following steps: acquiring geological parameters and engineering parameters of each small layer of the continental shale; determining a hydraulic fracturing fracture morphology parameter according to the geological parameters, the engineering parameters and a hydraulic fracturing process parameter; determining a support agent accumulation height of the continental shale under different horizontal well bore trajectory layer-penetrating positions according to the hydraulic fracturing fracture morphology parameter, and evaluating a support condition of a fracture height direction according to the support agent accumulation height; and determining a final horizontal well bore trajectory layer-penetrating position according to the hydraulic fracturing fracture morphology parameter and the support condition of the fracture height direction. The application determines an optimal horizontal well bore trajectory layer-penetrating position by evaluating the hydraulic fracturing fracture morphology parameter and the support condition of the fracture height direction under different bore trajectory layer-penetrating conditions, and is used for guiding drilling design and development, so that the fracturing reconstruction effect and the development effect of the continental shale are improved.

[0103] The optional implementation of the embodiments of the present application is described in detail above in combination with the drawings, but the embodiments of the present application are not limited to the specific details in the above implementation. Within the technical concept of the embodiments of the present application, the technical solutions of the embodiments of the present application can be variously and simply modified, and all the simple modifications belong to the protection scope of the embodiments of the present application.

[0104] In addition, it should be noted that each specific technical feature described in the above specific implementation can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the various possible combinations are not described again in the embodiments of the present application.

[0105] Those skilled in the art can understand that all or part of the steps of the methods described in the above embodiments can be completed by using a program instructing related hardware. The program is stored in a storage medium and includes a plurality of instructions for enabling a single-chip microcomputer, a chip or a processor to perform all or part of the steps of the methods described in the embodiments of the present application. The aforementioned storage medium includes a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk and various storage media that can store program codes.

[0106] In addition, the various different implementations of the embodiments of the present application can also be combined in any manner, as long as they do not contradict the idea of the embodiments of the present application, and they should also be considered as disclosed by the embodiments of the present application.

Claims

1. A method for obtaining the wellbore trajectory penetration position of a continental shale horizontal well, characterized in that: The method includes: Obtain geological and engineering parameters of each sub-layer of continental shale; Determining hydraulic fracturing crack morphology parameters based on the geological parameters, engineering parameters and hydraulic fracturing process parameters; Determining proppant accumulation heights at penetration positions of different horizontal wellbore trajectories of the continental shale according to the hydraulic fracturing fracture morphology parameters, and evaluating the proppant condition in the fracture height direction according to the proppant accumulation heights; The final horizontal wellbore trajectory penetration position is determined based on the hydraulic fracturing fracture morphology parameters and the support conditions in the fracture height direction.

2. The method according to claim 1, characterized in that Determining hydraulic fracturing crack morphology parameters according to the geological parameters, engineering parameters and hydraulic fracturing process parameters includes: Constructing a continental shale hydraulic fracturing fracture propagation model based on the geological parameters, engineering parameters and hydraulic fracturing process parameters; The hydraulic fracture propagation model is used to simulate the fracture morphology under different horizontal wellbore trajectory penetration conditions to obtain the hydraulic fracture morphology parameters under different horizontal wellbore trajectory penetration conditions; The geological parameters include porosity, permeability and formation pressure of each sub-layer; The engineering parameters include elastic modulus, Poisson's ratio, tensile strength and triaxial principal stress of each small layer; The hydraulic fracturing process parameters include segmented and clustered perforation, operation displacement, operation scale, and liquid viscosity; The hydraulic fracturing fracture morphological parameters include fracture height, longitudinal fracture width distribution and average fracture width under different horizontal wellbore trajectory penetration conditions.

3. The method according to claim 2, characterized in that The method of constructing a continental shale hydraulic fracturing fracture propagation model based on the geological parameters, engineering parameters and hydraulic fracturing process parameters includes: Interpretation and analysis of the geological parameters, engineering parameters and vertical distribution of each sub-layer are performed to obtain interpretation data, wherein the interpretation data includes vertical lithological characteristics and thickness changes, and vertical changes of geological parameters and engineering parameters; The continental shale hydraulic fracturing fracture propagation model is constructed based on the interpretation data and hydraulic fracturing process parameters.

4. The method according to claim 1, wherein The method of determining the proppant accumulation height at different wellbore trajectory penetration positions of the continental shale according to the hydraulic fracturing fracture morphology parameters includes: Obtaining the hydraulic fracture morphology parameters under the condition that the wellbore trajectory can penetrate the high-quality shale layer; Determine the proppant stacking height in the fracture height direction under the penetration layer of different horizontal wellbore trajectories that can connect the high-quality shale layer according to the hydraulic fracturing fracture morphology and construction parameters; The construction parameters include construction displacement, liquid viscosity, proppant particle size and sand addition concentration.

5. The method according to claim 1, wherein The method of determining the final horizontal wellbore trajectory penetration position according to the hydraulic fracturing fracture morphology parameters and the support condition in the fracture height direction includes: Determining the hydraulic fracture extension condition according to the hydraulic fracture morphology parameters under the different wellbore trajectories; Determine the horizontal wellbore trajectory penetration position and support fracture height that can connect to the high-quality shale layer based on the high expansion of the hydraulic fracture, and determine the wellbore trajectory penetration position that can fully support the high-quality shale layer; The final horizontal wellbore trajectory penetration position is determined by comparing the wellbore trajectory penetration positions of all high-quality shale layers that can be fractured and supported by proppants.

6. A device for obtaining the wellbore trajectory penetration position of a continental shale horizontal well, characterized by: The device includes: Acquisition module, used to obtain geological parameters and engineering parameters of each sub-layer of continental shale; A first processing module is used to determine hydraulic fracturing crack morphology parameters based on the geological parameters, engineering parameters and hydraulic fracturing process parameters; The second processing module is used to determine the proppant accumulation height at the penetration position of different horizontal wellbore trajectories of the continental shale according to the hydraulic fracturing fracture morphology parameters, and evaluate the support condition in the fracture height direction according to the proppant accumulation height; The third processing module is used to determine the final horizontal wellbore trajectory penetration position according to the hydraulic fracturing fracture morphology parameters and the support condition in the fracture height direction.

7. The device according to claim 6, characterized in that Determining hydraulic fracturing crack morphology parameters according to the geological parameters, engineering parameters and hydraulic fracturing process parameters includes: Constructing a continental shale hydraulic fracturing fracture propagation model based on the geological parameters, engineering parameters and hydraulic fracturing process parameters; The hydraulic fracture propagation model is used to simulate the fracture morphology under different horizontal wellbore trajectory penetration conditions to obtain the hydraulic fracture morphology parameters under different horizontal wellbore trajectory penetration conditions; The geological parameters include porosity, permeability and formation pressure of each sub-layer; The engineering parameters include elastic modulus, Poisson's ratio, tensile strength and triaxial principal stress of each small layer; The hydraulic fracturing process parameters include segmented and clustered perforation, operation displacement, operation scale, and liquid viscosity; The hydraulic fracturing fracture morphological parameters include fracture height, longitudinal fracture width distribution and average fracture width under different horizontal wellbore trajectory penetration conditions.

8. The device according to claim 7, characterized in that The method of constructing a continental shale hydraulic fracturing fracture propagation model based on the geological parameters, engineering parameters and hydraulic fracturing process parameters includes: Interpretation and analysis of the geological parameters, engineering parameters and vertical distribution of each sub-layer are performed to obtain interpretation data, wherein the interpretation data includes vertical lithological characteristics and thickness changes, and vertical changes of geological parameters and engineering parameters; The continental shale hydraulic fracturing fracture propagation model is constructed based on the interpretation data and hydraulic fracturing process parameters.

9. The device according to claim 6, characterized in that The method of determining the proppant accumulation height at different wellbore trajectory penetration positions of the continental shale according to the hydraulic fracturing fracture morphology parameters includes: Obtaining the hydraulic fracture morphology parameters under the condition that the wellbore trajectory can penetrate the high-quality shale layer; Determine the proppant stacking height in the fracture height direction under the penetration layer of different horizontal wellbore trajectories that can connect the high-quality shale layer according to the hydraulic fracturing fracture morphology and construction parameters; The construction parameters include construction displacement, liquid viscosity, proppant particle size and sand addition concentration.

10. The device according to claim 6, characterized in that The method of determining the final horizontal wellbore trajectory penetration position according to the hydraulic fracturing fracture morphology parameters and the support condition in the fracture height direction includes: Determining the hydraulic fracture extension condition according to the hydraulic fracture morphology parameters under the different wellbore trajectories; Determine the horizontal wellbore trajectory penetration position and support fracture height that can connect to the high-quality shale layer based on the high expansion of the hydraulic fracture, and determine the wellbore trajectory penetration position that can fully support the high-quality shale layer; The final horizontal wellbore trajectory penetration position is determined by comparing the wellbore trajectory penetration positions of all high-quality shale layers that can be fractured and supported by proppants.

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