Horizontal well geosteering modeling method based on geological engineering integration

Abstract

The invention discloses a horizontal well geosteering modeling method based on geological engineering integration, and belongs to the technical field of petroleum drilling exploration and development, and the horizontal well geosteering modeling method comprises the following steps: determining seismic response modes and logging characteristics of a high-quality reservoir and a non-reservoir of a structural target stratum where a target well is located; establishing a horizontal well geologic model; optimizing well trajectory design according to the horizontal well geological model and geological target region requirements; establishing a horizontal well drilling fluid safety density window model; establishing a drilling tool combination model and a matched process model; and comprehensively analyzing the models, effectively fusing a targeted and operable engineering scheme with a horizontal well geologic model, and establishing a horizontal well geosteering model adaptive to geological and engineering characteristics of a target well area. According to the method, the target drilling rate and the reservoir drilling rate of the horizontal well can be guaranteed, underground complexity and well control dangerous cases are effectively avoided, the construction efficiency of the horizontal well and the single well yield are improved, and the method is particularly suitable for efficient implementation of the horizontal well of the deep low-porosity ultra-low-permeability carbonate reservoir.

Description

Technical Field

[0001] The invention relates to the technical field of oil drilling exploration and development, and in particular to a horizontal well geosteering modeling method based on geological and engineering integration. Background Art

[0002] The Dengying Formation in the Gaoshiti-Moxi area is one of the main production layers of a gas field in a basin, with a burial depth of more than 5000m in general. The Dengying Formation platform margin belt in this area has well-developed reservoirs and high single-well production, but the intra-platform area with extensive gas content mainly develops low-porosity and ultra-low-permeability carbonate reservoirs. The single-well production of vertical wells implemented in the early stage was low, and the efficiency upgrade and utilization of reserves could not be achieved. The implementation of horizontal wells has proved that horizontal wells can effectively increase the single-well production of the Dengying Formation compared with vertical wells. It is an important technical measure to selectively and gradually explore the gas-rich "sweet spot" within the Dengying Formation platform and achieve effective upgrade and utilization of reserves.

[0003] The Dengying Formation in the Gaoshiti-Moxi area has high-temperature, hydrogen sulfide-containing, and well-developed siliceous layers. The reservoirs vary greatly in the vertical and lateral directions, and the resistivity of the reservoir sections is generally high. Although the horizontal wells in the previous tests can ensure the reservoir drilling rate and increase the gas production of single wells, there are many problems such as well leakage, frequent gas display, well wall instability, and low efficiency of geological guidance construction. When the well leakage is serious during the drilling process, leakage and blowout conversion are prone to occur, and well control hazards occur, posing major hidden dangers to life and property. In addition, the complexity of the downhole and the easy wear of the siliceous layer on the geological guidance instruments are the main factors for the low efficiency of horizontal well construction, resulting in a long well construction period and high well construction costs, which seriously restrict the safe and efficient exploration and development of the Dengying Formation in this area.

[0004] Existing geosteering modeling methods, such as "Research and Application of Geosteering Technology for Heterogeneous Fracture-Cave Reservoirs of Dengying Formation in Gaoshiti-Moxi Area" published in "Well Logging Technology" No. 5, 2022, "Application of Geological Modeling Technology While Drilling in Horizontal Well Geosteering" published in "Special Oil and Gas Reservoirs" No. 2, 2020, "Geological Steering Modeling Method for Horizontal Wells Combined with Well Seismic" (Patent Application No. 201610971436.4), "A Geosteering Modeling Method, System and Computer-readable Storage Medium" (Patent Application No. 202110816794.9), and "A Horizontal Well Integrated Geosteering Method" (Patent Application No. 201210581537.2), are mainly aimed at structural analysis and reservoir Prediction, identification, tracking and evaluation, well trajectory optimization adjustment and control, remote visualization, etc. can, to a certain extent, provide support for the implementation of horizontal wells in the Dengying Formation in the Gaoshiti-Moxi area. However, the established geosteering model fails to effectively combine specific geological characteristics, horizontal well drilling tool technology, and wellbore requirements for oil testing. Downhole anomalies such as well leakage, frequent gas display, well wall instability, support pressure, obstruction, and damage to geosteering instruments during geosteering drilling of horizontal wells often lead to low construction efficiency and long construction cycle. Therefore, the current geosteering modeling method is difficult to meet the requirements of efficient implementation of horizontal wells in deep low-porosity and ultra-low-permeability carbonate reservoirs, such as the Dengying Formation horizontal wells in the Gaoshiti-Moxi area. Summary of the invention

[0005] The present invention aims to solve the problem that the existing geosteering model is difficult to meet the demand for efficient implementation of horizontal wells in deep low-porosity and ultra-low-permeability carbonate reservoirs. A horizontal well geosteering modeling method based on geological and engineering integration is proposed. This method can ensure the target hitting rate and reservoir drilling rate of horizontal wells, effectively avoid downhole complexity and well control hazards, and improve the construction efficiency of horizontal wells and the production of single wells.

[0006] In order to achieve the above-mentioned object of the invention, the technical solution of the present invention is as follows: A horizontal well geosteering modeling method based on geological and engineering integration includes the following steps: S1. Determine the seismic response mode and logging characteristics of high-quality reservoirs and non-reservoir layers in the target layer of the structure where the target well is located; S2. Analyze the geological characteristics, structural characteristics, reservoir characteristics, fluid properties, and geostress of the target layer in the well area where the target well is located, make fine layer comparisons, clarify the distribution characteristics of favorable reservoirs, implement logging and mud logging marker layers, and establish a horizontal well geological model by combining the seismic response patterns and logging and mud logging characteristics of the target layer's high-quality reservoirs and non-reservoir layers; S3. Optimize well trajectory design based on the established horizontal well geological model and geological target area requirements; S4. Analyze the gas display, well leakage, and wellbore instability anomalies in each layer of the same open hole section in the study area and the target layer, and conduct research on formation pore pressure, collapse pressure, and fracture pressure in combination with the logging data of the corresponding layer section and the core rock mechanics test data, and establish a safe density window model for horizontal well drilling fluid; S5. Establish models of wellbore structure, well section drilling tool assembly and drilling parameter for horizontal wells, as well as supporting process models for lost circulation, stuck drill, pressure support, active gas display and difficult directional drilling; S6. Comprehensively analyze and study the horizontal well geological model, drilling fluid safety density window model, drill tool assembly and supporting process model, effectively integrate the targeted and operational engineering plan with the horizontal well geological model, and establish a horizontal well geological guidance model that adapts to the geological and engineering characteristics of the target well area.

[0007] Furthermore, the seismic response patterns and logging characteristics of high-quality reservoirs and non-reservoir layers in the target layer of the structure where the target well is located are determined based on a comprehensive analysis of the geological, seismic, logging, mud logging and oil testing data of the target layer of the structure where the target well is located.

[0008] Furthermore, the optimization of the well trajectory design according to the established horizontal well geological model and geological target area requirements includes: reducing the dogleg degree as much as possible in the inclination section while satisfying the vertical exploration of the reservoir, so as to reduce the footage of the non-reservoir inclination section above the horizontal well target; after drilling the target, reasonably increasing the inclination while satisfying the requirements of the project implementation and subsequent oil test wellbore to increase the reservoir drilling length; after the well trajectory enters the target, the well trajectory is adjusted to a horizontal state near the middle of the reservoir to avoid the well trajectory entering the bottom non-reservoir; when tracking the reservoir drilling, the lateral change characteristics of the reservoir are analyzed according to the horizontal well geological model and actual drilling data, and the trajectory adjustment plan is prepared in advance to avoid sudden increases and decreases in the well inclination, which causes difficulties in project implementation.

[0009] Furthermore, the horizontal well body structure, well section drill tool assembly and drilling parameter model, as well as the supporting process model for preventing various anomalies are determined based on the analysis and research on the drill bits, geological guidance equipment, drill tool assembly, drilling parameters, horizontal well drilling technology and oil testing requirements of the horizontal wells that have been drilled in the same target layer in the study area.

[0010] Furthermore, the analysis and research on the drill bits, geosteering equipment, drilling tools, drilling parameters, horizontal well drilling technology and oil testing requirements of the horizontal wells that have been drilled in the same target layer in the study area include: According to the lithology of the same target layer in the study area and the use of drill bits in completed horizontal wells, determine the drill bit model suitable for the target layer of the target well in the study area; Upgrade the geosteering equipment in the study area. Its resistivity antenna adopts an embedded structure, and the resistivity shell is an embedded six-antenna, dual-frequency four-transmit and dual-receive structure; According to different wellbore structures, different drilling tool sizes and combinations are selected; Determine the most important drilling parameters during horizontal well drilling, including drilling pressure and rotation speed; and control the horizontal wellbore trajectory according to geological steering requirements; Determine targeted tools and processes based on the existing problems of lost circulation, stuck pipe, pressure support, active gas display, and directional difficulties in geo-steering drilling in the same target layer in the study area; According to the oil testing results of completed horizontal wells in the study area, the relevant requirements for horizontal well oil testing are determined.

[0011] Furthermore, in view of the problem of lost circulation in geo-steering drilling in the study area, the targeted tool technologies include: a. According to the drilling fluid safety density window model, control the drilling fluid density and try to use low-density drilling fluid for drilling under the premise of meeting well control safety; b. During the drilling process, if the gas display is active and the drilling fluid density needs to be increased, determine the reasonable drilling fluid density to prevent blindly increasing the pressure leakage formation; c. When well leakage occurs, if granular plugging materials are used, the maximum particle size should be controlled within 3mm and the concentration should be less than 0.114g / m 3 , it is forbidden to use fibrous plugging materials; if there is a big leak, temporary plugging materials must be used to plug the leak. Insist on pouring drilling fluid with the same performance as that in the well to prevent spraying and leakage. At the same time, the geological guidance tool should be pulled out and special plugging drilling tools should be used to plug the leak. After the plugging is successful, the plugging materials in the drilling fluid should be circulated and cleaned. The geological guidance tool can be lowered again only after it is cleaned up; d. During the drilling process, the drilling fluid should be circulated in sections, the pump should be started steadily, and the displacement should be from small to large to avoid leakage caused by excessive instantaneous excitation pressure, which will cause leakage of the production layer and cause complex blowouts and leakage; e. Make good use of drilling fluid purification equipment to reduce the content of useless solid phase in drilling fluid and keep the drilling fluid clean; in addition, adopt fine pressure control drilling technology to reasonably adjust the drilling fluid density and wellhead back pressure, and keep the wellbore pressure within the safe density window during drilling and column connection to avoid complicated leakage and blowout conversion caused by pressure fluctuations; at the same time, because the Dengying Formation in the target well area contains hydrogen sulfide, the bottom hole liquid column pressure should always be kept slightly greater than the formation pore pressure to reduce the entry of formation fluid into the wellbore.

[0012] Furthermore, in view of the drill sticking problem in geo-steering drilling in the study area, the targeted tool technologies include: a. Based on the drill tool assembly model, simplify the drill tool assembly as much as possible while meeting the drill tool strength requirements to reduce the risk of drill sticking; b. Pay close attention to torque, pump pressure, displacement and vibrating screen sand samples during geo-steering drilling, and issue warnings in time if any abnormality is found; c. In the drilling of the inclined well section and the horizontal section, insist on using large displacement to carry sand. Once the friction and torque increase, promptly carry out short trip and segmented circulation to reduce the cuttings bed and prevent sand settling and drill jam; d. When directional drilling in the horizontal section, pay attention to the changes in drilling pressure, friction and drilling fluid properties to prevent adhesion and drill sticking; e. When the drill encounters resistance or hangs exceeding the normal friction, precise operation is required to eliminate the friction. Generally, when pulling out the drill, lift less and release more, and when lowering the drill, release less and lift more, to prevent the drill from getting stuck due to improper operation; f. When the drilling tool is stationary for a long time in the open hole section, move the drilling tool up and down significantly once every 3 minutes to avoid sticking and jamming of the drill due to long-term fixed-point circulation; g. Strengthen the inspection, repair and maintenance of equipment to ensure normal operation during the drilling process and avoid drill sticking due to equipment failure.

[0013] Furthermore, in view of the pressure-supporting problem existing in the geo-steering drilling in the study area, the targeted tool technologies include: a. When the pressure is severe, add plastic ball solid lubricant with a particle size of ≤0.3mm to achieve a short-term orientation effect; b. Apply hydraulic oscillators and top drive torsion technology to improve the effectiveness of drilling pressure transmission during drilling and reduce the friction between the bottom drill bit and the wellbore, solving the pressure support problem during directional and sliding drilling.

[0014] Furthermore, in view of the problem of active gas display in geo-steering drilling in the study area, the targeted tool technologies include: a. During drilling, strengthen tracking and monitoring while drilling and shut down the well in time when overflow is found; b. Before each drilling, a short trip should be carried out to fully circulate and verify whether the after-effect gas upward velocity meets the safety requirements for drilling. Drilling can only be carried out after ensuring safety. c. During drilling, the drilling speed should be strictly controlled in the gas layer and the vicinity of the gas layer to prevent excessive drilling speed from causing pumping gas invasion, resulting in an imbalance of pressure in the well and inducing a blowout; In addition, precise pressure control technology and constant pressure during the entire process of drilling and drilling are used to achieve stable control of wellbore pressure throughout the entire process of drilling, connecting columns, and drilling and drilling, effectively avoiding serious well leakage, leakage and blowout caused by pressure fluctuations under conditions of narrow density windows or no density window.

[0015] Furthermore, in view of the directional difficulties in geo-steering drilling in the study area, the targeted tool technologies include: a. When entering the horizontal well, use low dogleg angle to enter the target, gradually increase the inclination to the middle of the horizontal well target body, and try to reduce the dogleg angle to make the wellbore trajectory smooth and reduce the difficulty of directional drilling in the subsequent horizontal section; b. Drilling in the horizontal section, adjust the borehole trajectory to the middle of the horizontal well target; master the change rules of the well inclination and azimuth under the state of composite drilling of the target well and horizontal well, reserve a certain amount of well inclination and azimuth offset according to the change trend of the borehole trajectory, and adjust the borehole trajectory by controlling the drilling pressure when encountering directional difficulties in the horizontal section of the target well; while ensuring the requirements of the horizontal well target of the target well, perform as much composite drilling as possible to increase the drilling speed; c. Adjust the performance of the drilling fluid. During the actual drilling of the target well and horizontal well, add drilling fluid lubricant to reduce the friction during downhole orientation according to the friction resistance, so as to avoid the screw braking and failure of orientation due to the influence of the drilling fluid performance; d. If the drilling fluid performance does not meet the directional conditions, the directional lowering drill bit cannot reach the bottom, and the drill bit slips and causes the screw to brake, solid lubricant is added to the drilling fluid to meet the directional drilling of the target well and horizontal well.

[0016] In summary, the present invention has the following advantages: 1. The present invention establishes a geological model based on the analysis of the geology, seismic, well logging, mud logging, oil testing and other data of the target layer (Dengying Formation) in the study area. The geological structure is highly accurate, the geological target area is clear, and the reservoir prediction is highly reliable, which ensures the reliability of the horizontal well geological model in structure and reservoir, and lays the model foundation for achieving geological purposes.

[0017] 2. The horizontal well geological model of the present invention fully combines the geological, seismic, well logging, mud logging, geostress and other data of the target well and the target layer (Dengying Formation) of the adjacent wells. The well logging and mud logging marker layers are clear, and the model geological content is more in line with the actual target well. The marker layers are highly operable during the geological guidance process, and the target area orientation is effectively combined with the geostress characteristics of the target layer, which can effectively support the hitting of the target during the geological guidance while drilling, the reservoir tracking while drilling and the subsequent reservoir transformation during the oil test.

[0018] 3. Based on the geological model, the well trajectory design of the present invention fully considers the key well sections such as the inclination increase section, after drilling the target body, after entering the target body, and reservoir tracking drilling, which can effectively avoid the sudden change of the wellbore trajectory to bring difficulties to subsequent drilling, logging, oil testing and other operations.

[0019] 4. The present invention is the first to incorporate the research on formation pore pressure, collapse pressure and fracture pressure, the analysis and research on horizontal well drilling tool technology and oil testing related requirements into the horizontal well geosteering modeling. The established geosteering model is not only consistent with the geological characteristics of the target well area, but also contains engineering information that further enhances the practical operability of the model. While ensuring the horizontal well target and reservoir drilling rate, it can effectively reduce downhole complexity and improve the efficiency of horizontal well operations.

[0020] 5. The present invention analyzes and studies seismic, well logging, mud logging, drilling, oil testing, ground stress and other data, while ensuring the target area and reservoir encounter rate of horizontal wells, and incorporates the difficulties and needs of drilling and oil testing engineering in the target well area into the horizontal well geosteering modeling; it has made significant progress in the prediction and prevention of underground complexity, the improvement of horizontal well construction efficiency and the control of drilling costs.

[0021] 6. The present invention can guide the implementation of horizontal wells of the Dengying Formation in the Gaoshiti-Moxi area, reduce the complexity of horizontal well engineering and avoid well control hazards, improve the efficiency of horizontal well construction and single well production, and support the efficiency upgrade and utilization of the Dengying Formation reserves in the area.

[0022] 7. The basic data of the present invention are easy to obtain and highly targeted, and can be used for horizontal well geosteering modeling. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic flow chart of a method for horizontal well geological modeling based on geological and engineering integration provided in an embodiment of the present invention; Figure 2 A schematic diagram for comparing small layers provided in an embodiment of the present invention; Figure 3 A schematic diagram of a wellbore seismic profile and well trajectory design provided by an embodiment of the present invention; Figure 4 A schematic diagram of a geological model provided by an embodiment of the present invention; Figure 5 A schematic diagram of a drilling fluid safety density window model provided by an embodiment of the present invention; Figure 6 A schematic diagram of a drilling tool assembly model for a first wellbore structure provided by an embodiment of the present invention; Figure 7 A schematic diagram of a drilling tool assembly model for a second wellbore structure provided by an embodiment of the present invention; Figure 8 A schematic diagram of a comprehensive model provided for an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to explain the present invention more clearly, the present invention is further described below in conjunction with preferred embodiments and drawings. It should be understood by those skilled in the art that the content described below is illustrative rather than restrictive, and should not be used to limit the scope of protection of the present invention.

[0025] The present invention provides a horizontal well geosteering modeling method based on geological and engineering integration. With the concept of geological and engineering integration, the method combines geological modeling, well trajectory design, formation pore pressure, collapse pressure, fracture pressure, drilling tool combination required for horizontal well drilling, supporting processes and analysis and research on relevant requirements for oil testing, thus providing a new modeling mode for horizontal well geosteering.

[0026] The invention is applicable mainly to geo-steering modeling of horizontal wells in deep heterogeneous carbonate formations in oil and gas field evaluation areas and development areas, especially the gas-bearing areas in the Dengying formation in the Gaoshiti-Moxi area; it can also be promoted and applied in horizontal wells required for global oil and gas exploration and development.

[0027] Refer to the instruction manual Figure 1 As shown in the implementation flow chart, the method of the present invention specifically comprises the following steps: Step 1: Conduct comprehensive analysis and research on the geological, seismic, well logging, mud logging and oil testing data of the target layer (the fourth section of the Dengying Formation) where the target well is located, conduct detailed structural interpretation, and determine the seismic response mode and mud logging characteristics of the high-quality reservoir and non-reservoir layers of the target layer; Taking the fourth section of the Dengying Formation in the Gaoshiti-Moxi area as an example, the seismic response mode of its high-quality reservoir is mainly the bright spot mode. Its logging response mode is: ① Fracture-hole (or hole-hole) reservoir: electrical imaging holes and fractures are well developed, and the surface hole rate is ≥10%; the natural gamma curve is straight, and the value is less than 12API; the acoustic wave time difference value is greater than 50μs / ft; the deep lateral resistivity and the shallow lateral resistivity show an obvious "positive difference", 7000Ω.m> deep lateral resistivity value>200Ω.m; Stoneley wave energy attenuation is greater than 20%; the reservoir thickness is greater than 5m; ② Karst (or cave) reservoir: electrical imaging high conductivity anomaly, surface cave ratio ≥ 60%; natural gamma curve is straight, value is less than 15API; acoustic wave time difference value is greater than 55μs / ft; resistivity: 2000Ω.m> deep lateral resistivity value> 300Ω.m; Stoneley wave energy attenuation is greater than 30%; reservoir thickness is greater than 2m; Its logging characteristics are as follows: the fourth section of the Dengying Formation is thick dolomite. Analysis and research show that the degree of reservoir development is mainly affected by silicon. The distribution of silicon in the reservoir section is concentrated between 0 and 10%, while that in the non-reservoir section is concentrated between 4 and 22%. 8% can be used as the boundary between reservoir and non-reservoir. The gas display of high-quality reservoirs is active, and there are many well leaks. There is no logging display in the non-reservoir section.

[0028] Through the above analysis and research, the seismic response patterns and logging characteristics of high-quality reservoirs and non-reservoir layers in the target layer in the study area can be determined.

[0029] Step 2: Comprehensively analyze the geological, seismic, logging, and mud logging data of the fourth section of the Dengying Formation in the target well and adjacent wells, analyze and study the geological characteristics, structural characteristics, reservoir characteristics, fluid properties, and geostress of the target strata for horizontal well implementation, make fine layer comparisons, clarify the distribution characteristics of favorable reservoirs, implement geo-guided logging and mud logging marker layers, and establish a horizontal well geological model based on the seismic response patterns and logging and mud logging characteristics of the high-quality reservoirs and non-reservoir layers in the target strata.

[0030] The seismic response mode of the high-quality reservoirs in the fourth section of the Dengying Formation in the target well area of ​​the horizontal well is mainly a bright spot mode. The relevant research results of horizontal wells are combined with the previous understanding of horizontal well drilling in the study area. It is more conducive to reservoir transformation if the horizontal well trajectory has a certain angle with the maximum principal stress of the target layer.

[0031] The maximum principal stress direction of the Dengying Formation in the study area is about 120°. Combined with the structural characteristics and the seismic response mode of the high-quality reservoir, 232°±2° is selected as the implementation direction of the horizontal well of the target well. Combined with the analysis of the actual drilling data of the adjacent wells and the pilot well of the target well, the high-quality reservoir of the fourth section of the Dengying Formation in the target well is mainly developed within 40m from the top of the fourth section of the Dengying Formation. The reservoir fluid is gas without water characteristics. Refer to the attached manual Figure 2 shown.

[0032] Based on the above data and the analysis of the geological, logging, seismic and other data of adjacent wells, the formation dip angle is extracted according to the seismic depth profile, and the logging interpretation results of the target well pilot well are combined to establish the horizontal well geological model of the target well. Figure 4 Schematic diagram of the geological model shown.

[0033] Step 3: Optimize the well trajectory design based on the established horizontal well geological model and geological target area requirements.

[0034] It mainly includes: first, in the case of satisfying the vertical exploration of the reservoir, the dogleg degree should be reduced as much as possible to reduce the footage of the non-reservoir deflection section above the horizontal well target; after drilling the horizontal well target, the inclination should be reasonably increased on the premise of meeting the requirements of project implementation and subsequent oil testing to increase the reservoir drilling length; after the well trajectory enters the target, the well trajectory is adjusted to a horizontal state near the middle of the reservoir to avoid the well trajectory entering the bottom non-reservoir; when tracking the reservoir drilling, according to the horizontal well geological model and actual drilling data, the lateral change characteristics of the reservoir are analyzed, and the trajectory adjustment plan is prepared in advance to avoid sudden increases and decreases in the well inclination, which will cause difficulties in project implementation. For details, please refer to the attached manual Figure 3 Schematic diagram of seismic profile and well trajectory design shown.

[0035] The maximum dogleg angle of the horizontal wells drilled in the fourth section of the Dengying Formation in the study area was 9.3° / 30m. The test well string failed to reach the required well depth, which was 346m shallower than the designed depth. After comprehensive analysis of drilling and testing, the maximum dogleg angle of the target well should not exceed 8° / 30m. The fourth section of the Dengying Formation in the target well area is approximately horizontal. During the actual drilling guidance process, the wellbore trajectory needs to be adjusted in time to avoid drilling out of the horizontal well target body and ensure that the horizontal wellbore trajectory of the target well is controlled within 40m of the vertical thickness at the top of the fourth section of the Dengying Formation.

[0036] Step 4: Analyze the anomalies such as gas display, well leakage, and wellbore instability in each layer of the same open hole section of the fourth section of the Dengying Formation in the study area and the target layer, combine the core rock mechanics data and logging data of the corresponding layer sections, conduct research on formation pore pressure, collapse pressure and fracture pressure, and establish a safe density window model for horizontal well drilling fluid.

[0037] In order to avoid the instability and collapse of the well wall of the fourth section of the Dengying Formation, the GS118 well in the Gaoshiti-Moxi area has been drilled. The density of 1.60g / cm 3 After drilling with drilling fluid, a serious loss occurred due to the high density of drilling fluid after entering the horizontal section (accumulated loss of various drilling fluids 3913.4m 3 ), reducing the density to 1.24g / cm 3 The leakage was stopped later, but gas was frequently displayed and the well control safety pressure was high. The density was later increased to 1.30g / cm 3 The well was drilled to a depth of 6500m. To avoid the similar situation of Well GS118, it is necessary to conduct research on formation pore pressure, collapse pressure and fracture pressure during geosteering modeling and establish a drilling fluid safety density window model, such as Figure 5 Shown is a schematic diagram of the drilling fluid safety density window model provided in this embodiment.

[0038] According to the drilling fluid safety density window model of the target well, based on the core geostress experimental data of the fourth section of the Dengying Formation in the study area, the geostress logging evaluation and formation collapse pressure and fracture pressure logging of the fourth section of the Dengying Formation were carried out. The vertical principal stress, maximum horizontal principal stress, minimum horizontal principal stress, formation collapse pressure and fracture pressure were calculated according to the logging data of the pilot well of the target well. Combined with the measured formation pore pressure of the fourth section of the Dengying Formation in the adjacent wells, the three pressure profiles of the fourth section of the Dengying Formation were established; using the three pressure profiles, the safe drilling fluid density window of the fourth section of the Dengying Formation was calculated: the lower limit of the safe drilling fluid density of the fourth section of the Dengying Formation in the target well is 1.25-1.38g / cm 3 , average value 1.36g / cm 3 ; The upper limit of safe drilling fluid density is 1.64-1.72g / cm 3 , average value 1.66g / cm 3 Combined with the actual drilling fluid density of the target well pilot well and the characteristics of horizontal wells with long reservoir sections and larger well inclination, a safe density window model of the drilling fluid of the target well is established: density 1.25-1.38g / cm 3 2. The drilling fluid system adopts an anti-collapse drilling fluid system, and the drilling fluid performance is reasonably adjusted according to the actual drilling conditions of the target well and horizontal well, but the maximum density should not exceed 1.66g / cm 3 .

[0039] Step 5. Conduct analysis and research on the drill bits, geological guidance equipment, drilling tool assemblies, drilling parameters, horizontal well drilling technology and oil testing requirements of the completed horizontal wells in the fourth section of the Dengying Formation in the study area, establish models of the relevant wellbore structure, well section drilling tool assembly and drilling parameters of the horizontal well, and a supporting process model to prevent abnormalities such as lost circulation, stuck drill pipe, pressure support, active gas display, and directional difficulties.

[0040] Drill bit: In the geo-steering drilling of the horizontal section of the fourth section of the Dengying Formation in the study area, the silicon content in the non-reservoir layer is as high as more than 20%. Generally, drilling 20 to 30 meters will easily cause the drill bit to be worn out and scrapped. The 7-blade PDC drill bit in the drilled horizontal wells has a better effect than the 6-blade PDC drill bit. Therefore, the 7-blade PDC drill bit is preferred for the target horizontal well. Geological guidance equipment: In the horizontal wells of Dengying Formation in Gaoshiti-Moxi area, the geological guidance instrument was damaged after drilling 100-200m. After research and development, the upgraded geological guidance instrument can drill more than 500m in one trip. The upgraded geological guidance instrument has the following features: the resistivity antenna adopts an embedded structure, the resistivity shell is an embedded six-antenna, dual-frequency four-transmitting and dual-receiving structure, and the resistivity shell is welded with two wear-resistant belts or installed with two wear-resistant sleeves. The upgraded geological guidance equipment is selected for the target horizontal well, which lays the foundation for the efficient implementation of geological guidance. Drilling tool combination: Drilling tool size and combination vary according to different wellbore structures: ① For example Figure 6 As shown in the figure, for the case of 7” casing hanging, a 5”+4” drilling tool combination is generally used. Compared with the conventional 5”+3.5” drilling tool combination for vertical wells, it will reduce the circulating pressure loss and increase the displacement by 1.5~2L / s in actual application; ② As Figure 7 As shown in the figure, for the case of 7” casing in the whole well, a 4”+3.5” drill bit combination is generally used. Compared with the 3.5” drill bit combination of conventional vertical wells, it will reduce the circulating pressure loss and increase the displacement by 1-1.5L / s in actual application. The target well is suspended with 7” casing, so a 5”+4” drill bit combination is suitable.

[0041] The characteristics of the drilling tool assembly of the horizontal wells drilled in the fourth section of the Dengying Formation in the Gaoshiti-Moxi block were analyzed and studied. The most effective drilling tool assembly modes for different sections of the horizontal wells are as follows: ① The drilling tool assembly before entering the horizontal well target should have the characteristics of natural inclination increase in composite drilling and rapid inclination increase in sliding drilling, which can ensure accurate and smooth entry into the horizontal well target; ② The horizontal section drilling tool assembly after entering the horizontal well target reservoir should be able to better control the well inclination and azimuth, enable long-term composite drilling, and solve the sliding support pressure problem.

[0042] In view of the geological characteristics that the formation dip angle of the fourth member of the Dengying Formation in the target well is close to horizontal and the high-quality reservoirs of the fourth member of the Dengying Formation are mainly developed within 40m from the top of the fourth member of the Dengying Formation, the horizontal well drilling tool assembly model of the target well is established as follows: ① Inclination section: 149.2mm PDC drill bit + straight motor + 2.5° bent joint + 2 float valves + UBHO directional joint + CLPS communication short joint + MWD while drilling instrument + non-magnetic weighted drill pipe + variable buckle joint + 18 columns of drill pipe + 12 columns of weighted drill pipe + drill pipe to wellhead; ② Landing-horizontal section: 149.2mm PDC drill bit + 1.5° single-bend screw + 2 float valves + short non-magnetic (CLPS) + Impulse while drilling instrument + non-magnetic weighted drill pipe + variable buckle joint + 16 drill pipes + variable buckle + water push + variable buckle + 25 columns of drill pipe + 12 columns of weighted drill pipe + drill pipe to wellhead.

[0043] Drilling parameters: drilling pressure and rotation speed are the most important drilling parameters in the process of horizontal well drilling. In the geo-steering drilling of the fourth section of the Dengying Formation in the Gaoshiti-Moxi area, 149.2mm drill bits were used for drilling the landing section and the horizontal section, and the maximum pressure of the drill bit was 60KN. High drilling pressure was mostly used in the landing section to make full use of the natural inclination effect of the drill bit. The horizontal section needs to control the wellbore trajectory according to the requirements of geo-steering. 40KN drilling pressure composite drilling is often used. According to the change law of composite drilling well inclination, increasing or decreasing the drilling pressure can adjust the well inclination during composite drilling. Combined with downhole torque and drill performance, the completed horizontal wells in the fourth section of the Dengying Formation in the study area have confirmed that the rotation speed is best at 30-50 rpm, and exceeding 60 rpm is prone to fatigue fracture of the drill bit. Analysis shows that the drilling pressure of the horizontal well inclination section of the target well should not exceed 60KN, the drilling pressure of the horizontal section should be about 40KN, and the rotation speed should be 30-50 rpm.

[0044] Related horizontal well drilling tools and technologies: In the geo-steering drilling of the fourth section of the Dengying Formation in the Gaoshiti-Moxi area, there are problems such as lost circulation, pipe sticking, pressure support, active gas display (well control risk), and directional difficulties. The main targeted tools and technologies are: ① Well leakage: a. According to the drilling fluid safety density window model, control the drilling fluid density and try to use low-density drilling fluid for drilling under the premise of meeting well control safety; b. During drilling, if the gas display is active and the drilling fluid density needs to be increased, determine the reasonable drilling fluid density to prevent blindly increasing the pressure leakage formation; c. In the event of well leakage, if granular plugging materials are used, the maximum particle size is controlled within 3mm and the concentration is less than 0.114g / m 3, it is forbidden to use fibrous plugging materials; if a large leak occurs, temporary plugging materials must be used to plug the leak. Insist on pouring drilling fluid with the same performance as that in the well into the well to prevent both spraying and leakage. At the same time, the geological guidance tool should be pulled out and a special plugging drill should be used to plug the leak. After the plugging is successful, the plugging materials in the drilling fluid should be circulated and cleaned. Only after cleaning can the geological guidance tool be lowered again; d. During the drilling process, the drilling fluid should be circulated in sections, the pump should be turned on steadily, and the displacement should be from small to large to avoid leakage caused by excessive instantaneous excitation pressure and leakage of the production layer. Cause the complexity of both blowout and leakage; e. Make good use of drilling fluid purification equipment to reduce the content of useless solid phase in drilling fluid and keep the drilling fluid clean; in addition, fine pressure control drilling technology can be used to reasonably adjust the drilling fluid density and wellhead back pressure, and keep the wellbore pressure within the safe density window during drilling and column connection to avoid complications such as leakage and blowout caused by pressure fluctuations; at the same time, because the fourth section of the Dengying Formation in the target well area contains hydrogen sulfide, the bottom hole liquid column pressure should always be kept slightly greater than the formation pore pressure to reduce the entry of formation fluid into the wellbore.

[0045] ② Drill stuck: a. Based on the drill tool assembly model, simplify the drill tool assembly as much as possible while meeting the drill tool strength requirements to reduce the risk of drill stuck; b. Pay close attention to torque, pump pressure, displacement and vibrating screen sand samples during geo-directional drilling, and issue timely warnings when abnormalities are found; c. In the drilling of the inclined well section and horizontal section, large displacement sand should be used. Once the friction resistance and torque increase, short-distance drilling and segmented circulation should be carried out in time to reduce the cuttings bed and prevent sand settling and drill stuck; d. When directional drilling in the horizontal section, pay attention to the drilling pressure. , friction and drilling fluid performance changes to prevent adhesion and drill sticking; e. When the drill encounters resistance or hanging that exceeds the normal friction, precise operation is required to eliminate the friction. Generally, less lifting and more lowering is required when pulling out the drill, and less lowering and more lifting is required when drilling down to prevent drill sticking due to improper operation; f. When the drill tool has been stationary in the open hole section for a long time, the drill tool should be moved up and down significantly once every 3 minutes to avoid adhesion and drill sticking caused by long-term fixed-point circulation; g. Strengthen the inspection, repair and maintenance of equipment to ensure normal operation during drilling and avoid drill sticking due to equipment failure.

[0046] ③ Support pressure: a. When the support pressure is serious, solid lubricants such as plastic balls (particle size ≤ 0.3mm) can be added to achieve a short-term directional effect; b. The application of tools and processes such as hydraulic oscillators and top drive torsion technology can improve the effectiveness of drilling pressure transmission during drilling and reduce the friction between the bottom drill bit and the wellbore, effectively solving the support pressure problem during directional and sliding drilling.

[0047] ④ Active gas display (well control risk): a. During drilling, strengthen tracking and monitoring while drilling, and shut down the well in time when overflow is found; b. Before each drilling, a short-distance drilling operation should be carried out to fully circulate and verify whether the speed of the after-effect gas rises to meet the safety of drilling and drilling, and drilling can be started only after ensuring safety; c. During drilling, the drilling speed in the gas layer and the vicinity of the gas layer should be strictly controlled to prevent the drilling speed from being too fast and causing pumping gas invasion, resulting in the loss of pressure balance in the well and inducing blowout; in addition, fine pressure control technology and full-time constant pressure drilling can achieve stable control of wellbore pressure throughout the entire process of drilling, column connection, and drilling and drilling, effectively avoiding serious well leakage, leakage and blowout caused by pressure fluctuations under the condition of a narrow safety density window.

[0048] ⑤ Difficulty in directional drilling: a. When drilling a horizontal well, use a low dogleg angle to drill into the target, gradually increase the inclination to the middle of the horizontal well target body, and try to reduce the dogleg angle to make the wellbore trajectory smooth, thereby reducing the difficulty of directional drilling in the subsequent horizontal section; b. When drilling in the horizontal section, adjust the wellbore trajectory to the middle of the horizontal well target body; master the variation law of well inclination and azimuth under the composite drilling state of the target well and horizontal well, reserve a certain amount of well inclination and azimuth offset according to the variation trend of the wellbore trajectory, and adjust the wellbore trajectory by controlling the drilling pressure when encountering directional difficulties in the horizontal section of the target well; While ensuring the target requirements of the horizontal well, perform as much composite drilling as possible to increase the drilling speed; c. Adjust the performance of the drilling fluid. During the actual drilling of the horizontal well of the target well, according to the friction resistance during downhole directional drilling, reasonably add drilling fluid lubricant to reduce resistance to avoid screw braking and failure to directional drilling due to the influence of drilling fluid performance; d. If the drilling fluid performance does not meet the directional conditions, the directional lowering drill bit cannot reach the bottom, and the drill bit slips and causes screw braking, solid lubricants can be added to the drilling fluid to meet the directional drilling of the horizontal well of the target well; Relevant requirements for horizontal well testing: The results of the completed horizontal well testing in the fourth section of the Dengying Formation in the Gaoshiti-Moxi area have confirmed that when the maximum dogleg angle of the horizontal wells in the fourth section of the Dengying Formation in this area exceeds 8° / 30m, it is difficult for the subsequent testing operation string to smoothly descend to the required well depth. Therefore, the maximum dogleg angle during the implementation of the target well horizontal well should not exceed 8° / 30m.

[0049] Step 6. Comprehensive analysis and research on the integration of geology and engineering, including the horizontal well geological model, drilling fluid safety density window model, horizontal well drilling tool assembly and supporting process model, and relevant requirements for oil testing. With the goal of shortest drilling cycle, highest reservoir encounter rate, least complex disposal time, best wellbore quality, and meeting relevant requirements for oil testing, a horizontal well geosteering model with optimal comprehensive geological engineering elements, close to the actual horizontal wells of the fourth section of the Dengying Formation in the Gaoshiti-Moxi area, and strong operability is established.

[0050] In the Gaoshiti-Moxi area, the GS118 well was drilled using conventional methods to establish a horizontal well geosteering model. The well began to increase the inclination at a depth of 5266m. During the implementation, the inclination section collapsed. The horizontal section encountered 7 gas invasions, 4 gas logging anomalies, and 3 well leaks (accumulated loss of various drilling fluids 3913.4m 3 ), the pressure coefficient of the regional lamp shadow group is 1.10. To prevent the well wall from instability and collapse, the density of the increased inclination section is 1.60g / cm 3 Drilling fluid drilling, maintain density 1.60g / cm 3 After drilling into the horizontal section, we encountered a serious loss of circulation and gradually reduced the density to 1.24g / cm 3 , density 1.24g / cm 3 Drilling gas is frequently displayed, well control safety pressure is high, and density is increased to 1.30g / cm 3 The well was drilled to a depth of 6500m and the horizontal section test yielded 109.45×10 4 m 3 / d high-yield industrial gas flow; GS118 well horizontal section geosteering operation accumulated 30 drillings, with an operation footage of 1,236m and an operation time of 120 days. During the implementation process, the pulser of the geosteering instrument was blocked by rock cuttings many times, the antenna was seriously worn, and the underground anomalies such as support pressure were frequent during the horizontal section drilling, resulting in low overall construction efficiency; The geosteering model established by the present invention for the MX131 well in this area is based on the conventional horizontal well geosteering model, and effectively combines the drilling fluid safety density window model, the horizontal well drilling tool assembly and the supporting process model, as well as the relevant requirements for oil testing, as shown in the attached manual. Figure 8 As shown. The density of the horizontal section of the well is 1.30g / cm 3 During drilling, 15 gas logging anomalies were found (the longest gas logging anomaly section was 84m thick), and no leakage or wellbore instability and collapse occurred. The geological guidance operation was carried out for 6 times, with a footage of 920m and an operation time of 34 days. The overall construction efficiency of the horizontal well was high, which was 162.7% higher than that of the GS118 well, and the construction efficiency was significantly improved. The oil test obtained 52.01×10 4 m 3 / d high-yield industrial gas flow, which is 5 times higher than the test production of the fourth section of the vertical well of the Dengying Formation in the adjacent well; it can be proved that the geological guidance model established by the present invention has achieved the purpose of improving the horizontal well construction efficiency and the single well production.

[0051] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A horizontal well geological steering modeling method based on the integration of geology and engineering, characterized in that, it includes the following steps: S1. Determine the seismic response patterns and logging and well logging characteristics of high-quality reservoirs and non-reservoirs in the target layer of the structure where the target well is located; S2. Analyze the geological characteristics, structural characteristics, reservoir characteristics, fluid properties, and in-situ stresses of the target layer in the well area where the target well is located, conduct fine sub-layer correlation, clarify the distribution characteristics of favorable reservoirs, identify logging and well logging marker beds, and establish a horizontal well geological model in combination with the seismic response patterns and logging and well logging characteristics of high-quality reservoirs and non-reservoirs in the target layer; S3. Optimize the well trajectory design according to the established horizontal well geological model and the requirements of the geological target area; S4. Analyze the gas shows, lost circulation, and wellbore instability anomalies in each layer of the same open hole section in the study area and the target layer, and conduct research on formation pore pressure, collapse pressure, and fracture pressure in combination with the logging data and core rock mechanics test data of the corresponding sections to establish a horizontal well drilling fluid safety density window model; S5. Establish models for the relevant wellbore structure, drill string assembly in well sections, and drilling parameters of horizontal wells, as well as supporting process models for lost circulation, stuck pipe, string drag, active gas shows, and difficult directional drilling; S6. Comprehensively analyze and study the horizontal well geological model, drilling fluid safety density window model, drill string assembly, and supporting process models, effectively integrate the targeted and operable engineering solutions with the horizontal well geological model, and establish a horizontal well geological steering model adapted to the geological and engineering characteristics of the target well area.

2. The horizontal well geological steering modeling method based on the integration of geology and engineering according to claim 1, characterized in that, the seismic response patterns and logging and well logging characteristics of high-quality reservoirs and non-reservoirs in the target layer of the structure where the target well is located are determined through comprehensive analysis and research of the geological, seismic, logging, well logging, and well testing data of the target layer of the structure where the target well is located.

3. The horizontal well geological steering modeling method based on the integration of geology and engineering according to claim 1, characterized in that, the optimization of the well trajectory design according to the established horizontal well geological model and the requirements of the geological target area includes: in the build-up section, while meeting the requirement of longitudinally exploring the reservoir, the dogleg severity should be reduced as much as possible to reduce the footage of the non-reservoir build-up section above the horizontal well target body; after drilling into the target body, the inclination should be increased reasonably on the premise of meeting the requirements of engineering implementation and subsequent well testing wellbore to increase the reservoir penetration length; after the well trajectory enters the target body, the well trajectory should be adjusted to enter the horizontal state near the middle of the reservoir to avoid the well trajectory entering the bottom non-reservoir; when drilling while tracking the reservoir, according to the horizontal well geological model and the actual drilling data, analyze the lateral variation characteristics of the reservoir, and make a trajectory adjustment plan in advance to avoid sudden increases and decreases in well inclination, causing difficulties in engineering implementation.

4. The horizontal well geological steering modeling method based on the integration of geology and engineering according to claim 1, characterized in that, the models for the relevant wellbore structure, drill string assembly in well sections, and drilling parameters of horizontal wells, as well as the supporting process models for preventing various anomalies, are determined through analysis and research on the drill bits, geological steering equipment, drill string assemblies, drilling parameters, horizontal well drilling technology, and well testing requirements of the completed horizontal wells in the study area.

5. A horizontal well geological steering modeling method based on geological engineering integration according to claim 4, characterized in that, the analysis and research on the bits, geological steering equipment, drill string assemblies, drilling parameters, horizontal well drilling technology and oil testing requirements of the completed horizontal wells in the study area include: According to the lithology of the same target formation in the study area and the usage of bits in the completed horizontal wells, determine the bit models applicable to the target formation of the target well in the study area; Upgrade the geological steering equipment in the study area. Its resistivity antenna adopts an embedded structure, and the resistivity housing is an embedded six-antenna, dual-frequency four-transmitter and two-receiver structure; For different wellbore structures, select different drill string sizes and assemblies; Determine the most important drilling parameters during horizontal well drilling, including weight on bit and rotary speed; and control the wellbore trajectory of the horizontal section according to geological steering requirements; According to the problems of lost circulation, stuck pipe, drag, active gas shows, and difficult directional drilling existing in geological steering drilling in the study area, determine targeted tool technologies; According to the oil testing conditions of the completed horizontal wells in the study area, determine the relevant requirements for horizontal well oil testing.

6. A horizontal well geological steering modeling method based on geological engineering integration according to claim 5, characterized in that, For the problem of lost circulation existing in geological steering drilling in the study area, the targeted tool technologies include: a. Based on the drilling fluid safety density window model, control the drilling fluid density well. On the premise of meeting well control safety, try to use low-density drilling fluid for drilling; b. During the drilling process, when it is necessary to increase the density of the drilling fluid due to active gas shows, determine a reasonable drilling fluid density to prevent blindly increasing the density and fracturing the formation; c. In case of lost circulation, if granular plugging materials are used, the maximum particle size of the particles shall be controlled within 3 mm and the concentration shall be less than 0.114 g / m 3 , and fibrous plugging materials are prohibited; in case of severe lost circulation, when temporary plugging materials must be used for plugging, keep pumping drilling fluid with the same properties as that in the well into the well to prevent blowout and lost circulation at the same time. After pulling out the geological steering tool, lower special plugging drill tools for plugging. After successful plugging, circulate to clean the plugging materials in the drilling fluid. After cleaning, lower the geological steering tool again; d. Circulate the drilling fluid in sections during the tripping process. Start the pump smoothly, and the displacement should increase from small to large to avoid lost circulation caused by excessive instantaneous surge pressure, fracturing the producing formation, and causing blowout and lost circulation; e. Make good use of the drilling fluid purification and treatment equipment to reduce the content of useless solids in the drilling fluid and keep the drilling fluid clean; f. Adopt the fine pressure control drilling technology, reasonably adjust the drilling fluid density and wellhead backpressure, and keep the wellbore pressure within the safe density window during drilling and connecting stands; at the same time, always keep the bottom hole fluid column pressure slightly greater than the formation pore pressure to reduce the entry of formation fluids into the wellbore.

7. A horizontal well geological steering modeling method based on geological engineering integration according to claim 5, characterized in that, For the problem of stuck pipe existing in geological steering drilling in the study area, the targeted tool technologies include: a. Based on the drill string assembly model, simplify the drill string assembly as much as possible on the premise of meeting the drill string strength requirements to reduce the risk of stuck pipe; b. During the geological steering drilling process, closely monitor the torque, pump pressure, displacement and shaker sand samples, and give early warnings in time when abnormalities are found; c. During the build-up section and horizontal section drilling, keep using large displacement to carry sand. Once it is found that the friction and torque increase, immediately conduct short trips and sectional circulation to reduce the cuttings bed and prevent sand settling and sticking; d. When drilling directionally in the horizontal section, pay attention to observing the changes in weight on bit, friction and drilling fluid performance to prevent adhesion and sticking; e. When encountering resistance or hanging during tripping that exceeds the normal friction, eliminate the friction and perform precise operations. Generally, when pulling out the drill string, lift less and lower more; when running in the drill string, lower less and lift more to prevent sticking due to improper operations. f. When the drill string stays in the open hole section for a long time, move the drill string up and down significantly once every 3 minutes to avoid sticking caused by long-term fixed-point circulation. g. Strengthen the inspection, repair, and maintenance of equipment to ensure normal operation during drilling and avoid sticking caused by equipment failures.

8. A horizontal well geological steering modeling method based on the integration of geology and engineering according to claim 5, characterized in that for the problem of weight transfer loss existing in the geological steering drilling in the study area, the targeted tool technologies include: a. When the weight transfer loss is severe, add solid lubricants of plastic balls with a particle size ≤ 0.3 mm to achieve the short-term directional effect. b. Apply hydraulic oscillators and top drive pendulum technologies to improve the effectiveness of drill pressure transfer during drilling and reduce the friction between the bottom hole assembly and the wellbore, and solve the problem of weight transfer loss during directional and sliding drilling.

9. A horizontal well geological steering modeling method based on the integration of geology and engineering according to claim 5, characterized in that for the problem of active gas shows existing in the geological steering drilling in the study area, the targeted tool technologies include: a. During drilling, strengthen the follow-up monitoring while drilling, and close the well in time when a kick is detected. b. Before each trip out, first conduct a short trip to verify whether the afterflow gas kick-up speed meets the safety requirements for tripping, and ensure safety before tripping out. c. During tripping out, strictly control the tripping speed in the gas zone and near the gas zone to prevent gas invasion caused by too fast tripping speed, resulting in imbalance of wellbore pressure and inducing blowout. d. Adopt fine pressure control technology and constant pressure tripping throughout the process to achieve stable control of wellbore pressure during drilling, connecting stands, and tripping.

10. A horizontal well geological steering modeling method based on the integration of geology and engineering according to claim 5, characterized in that for the problem of difficult directional drilling existing in the geological steering drilling in the study area, the targeted tool technologies include: a. When entering the target in a horizontal well, enter the target with a low dogleg severity, gradually increase the inclination to the middle of the target body of the horizontal well, and try to reduce the dogleg severity to make the wellbore trajectory smooth and reduce the difficulty of directional drilling in the subsequent horizontal section. b. During horizontal section drilling, adjust the wellbore trajectory to the middle of the target body of the horizontal well; master the variation laws of well inclination and azimuth under the compound drilling state of the target horizontal well, reserve a certain amount of well inclination and azimuth offset according to the variation trend of the wellbore trajectory, and when encountering difficulties in directional drilling in the horizontal section of the target well, control the drill pressure to adjust the wellbore trajectory; while ensuring the requirements of the target body of the horizontal well of the target well, try to perform more compound drilling to improve the drilling speed. c. Adjust the performance of the drilling fluid, and reasonably add drilling fluid lubricant to reduce resistance according to the friction during downhole orientation during the actual drilling of the target horizontal well to avoid the inability to orient due to the influence of drilling fluid performance resulting in the braking of the positive displacement motor. d. If the drilling fluid performance does not meet the directional conditions, the drill string cannot reach the bottom during orientation, or the drill string slips resulting in the braking of the positive displacement motor, add solid lubricants to the drilling fluid to meet the directional drilling requirements of the target horizontal well.

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