A long build-up section composite drilling speed-up method and speed-up system

Abstract

The application discloses a long-stabilized-inclination-section composite drilling speed-up method and a speed-up system, which comprises a sliding guide drilling system composite drilling inclination change rate prediction method, a sliding guide drilling tool combination design and drilling parameter optimization method, a long-stabilized-inclination-section to-be-drilled track optimization and control method matched with the sliding guide drilling system and a screw drill working parameter regulation method conducive to long-stabilized-inclination-section speed-up. Starting from the sliding guide drilling system composite drilling inclination change rate prediction method, through optimization of the sliding guide drilling system design scheme, drilling parameters and the long-stabilized-inclination-section to-be-drilled track design scheme, the composite drilling inclination change rate can be predicted and regulated while drilling, and the composite drilling mode can be used as much as possible in the long-stabilized-inclination section. Through real-time regulation of the screw drill working parameters, the screw drill can convert more hydraulic energy into mechanical energy to drive the drill bit to break rocks, the long-horizontal-section composite drilling speed and the screw drill output power can be improved, and the screw drill can be prevented from being damaged in advance.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of oil and gas drilling, and relates to a long build-up section composite drilling speed-up method and a speed-up system. BACKGROUND

[0002] Current oil and gas resource exploration and development is turning to deep strata, in order to improve exploration and development efficiency, the number of directional wells and horizontal wells is increasing. For the directional wells and horizontal wells with large reservoir burial depth, the designed well trajectory basically has a long build-up section (more than 1000m), and a sliding guide drilling system is generally used to drill the long build-up section (including the horizontal section) at home and abroad. The system can switch to sliding drilling mode to quickly adjust the well trajectory at any time, or to composite drilling mode to improve the drilling speed. Drilling theory and practice show that, under the same conditions, the composite drilling speed is often several times the sliding drilling speed; the composite drilling mode is mainly used when drilling the long build-up section, and the sliding drilling mode is auxiliary; whether the long build-up section can be safely and quickly drilled often becomes the key link to shorten the drilling cycle and reduce the drilling cost. Patent No. CN107609214B discloses a well trajectory tortuosity control method capable of improving the effect of horizontal section composite drilling, which only relates to the well trajectory design method of the horizontal section to be drilled, does not relate to the design of the long build-up section sliding guide drilling system and the prediction and analysis of the composite drilling effect, and is completely different from the core technology of the present patent application. Patent No. CN202010301009.1 discloses a two-opening-one-trip drilling assembly and construction method suitable for oil well horizontal well construction, which only relates to the operation method of a single-bend single-stabilizer sliding guide drilling system, does not relate to the well trajectory design method of the long build-up section to be drilled, and does not relate to the design of the long build-up section sliding guide drilling system and the prediction and analysis of the composite drilling effect. Scientifically formulating a long build-up section composite drilling speed-up method and as much as possible using the composite drilling mode have become an important technical problem to be solved in the field of drilling engineering. SUMMARY

[0003] The present application aims to solve the problems in the prior art, and provides a long build-up section composite drilling speed-up method and a speed-up system, which aims to solve the technical problems of low composite drilling proportion, frequent drilling mode alternation and being not conducive to drilling speed-up in the prior art.

[0004] To achieve the above-mentioned purpose, the following technical solutions are adopted in the present application:

[0005] The long build-up section composite drilling speed-up method provided by the present application comprises the following steps:

[0006] obtain the composite drilling parameters of the long build-up section, set the high side tool face 0° and the high side tool face 180°, predict the build-up rate K0 and the drop-off rate K180 according to the composite drilling parameters of the long build-up section; obtain the well deviation change rate Kr according to the average of the build-up rate K0 and the drop-off rate K180;

[0007] obtain the length Lh of the build-up section and the well deviation angle αbo of the build-up section, predict the well deviation angle cumulative deviation Δα of the long build-up section according to the length Lh of the build-up section and the well deviation change rate Kr; adjust the well deviation angle αbs corresponding to the starting point of the build-up section composite drilling and the well deviation angle αbe corresponding to the ending point of the build-up section composite drilling according to the well deviation angle cumulative deviation Δα and the well deviation angle αbo of the build-up section;

[0008] monitor the well deviation angle α and the well deviation change rate Kr, when the well deviation angle α is close to the well deviation angle αbe corresponding to the ending point of the build-up section composite drilling, switch to the sliding drilling mode, adjust the well deviation angle α to the well deviation angle αbs corresponding to the starting point of the build-up section composite drilling until the build-up section drilling is completed; when the well deviation angle α is far away from the well deviation angle αbe corresponding to the ending point of the build-up section composite drilling, continue to monitor the well deviation angle α and the well deviation change rate Kr until the build-up section drilling is completed.

[0009] Preferably, the method for predicting the build-up rate K0 and the drop-off rate K180 is as follows:

[0010] preliminarily give the wellbore curvature K, perform the BHA stress analysis, obtain the bit lateral force and the bit turning angle, and obtain the well deviation trend angle according to the bit lateral force and the bit turning angle;

[0011] if the well deviation trend angle is 0, the given wellbore curvature K is the build-up rate; if the well deviation trend angle is not 0, the wellbore curvature K is given again, the bit lateral force and the bit turning angle are obtained again until the well deviation trend angle is 0.

[0012] Preferably, the bit lateral force and the bit turning angle are expressed as formula (1):

[0013] (1)

[0014] wherein, is the corresponding bending moment near the bit stabilizer; is the drilling pressure; , , are respectively the length, the lateral uniform load and the stability coefficient of the first span beam of the lower drilling tool assembly; is the corresponding support height near the bit stabilizer; , are both the load amplification coefficients of the first span beam.E is the modulus of elasticity of the drill string; I1 is the cross-sectional moment of inertia of the first beam.

[0015] Preferably, the inclination trend angle The mathematical expression is shown in formula (2):

[0016] (2)

[0017] wherein, is the anisotropy index of the drill bit.

[0018] Preferably, the expression of the inclination angle cumulative deviation Δα is: Δα=Kr×Lh.

[0019] The expression of the inclination angle αbs corresponding to the starting point of the build-up section composite drilling is: αbs=αbo-Δα.

[0020] The expression of the inclination angle αbe corresponding to the ending point of the build-up section composite drilling is: αbe=αbo+Δα.

[0021] Preferably, the inclination change rate Kr of the long build-up section composite drilling is greater than 0, which is to adjust the long build-up section as a slow build-up section as a whole.

[0022] Preferably, the inclination change rate Kr of the long build-up section composite drilling is less than 0, which is to adjust the long build-up section as a slow drop section as a whole.

[0023] Preferably, the speed-up method of the long build-up section composite drilling mainly uses composite drilling and auxiliary sliding drilling.

[0024] The speed-up system of the speed-up method of the long build-up section composite drilling provided by the application comprises:

[0025] The composite drilling inclination change rate acquisition module is used to acquire the long build-up section composite drilling parameters, set the high-side tool face 0° and the high-side tool face 180°, predict the full-force build-up build-up rate K0 and the full-force drop build-up rate K180 according to the long build-up section composite drilling parameters, and acquire the composite drilling inclination change rate Kr according to the average of the full-force build-up build-up rate K0 and the full-force drop build-up rate K180.

[0026] The inclination angle adjustment module is used to acquire the build-up section length Lh and the build-up section inclination angle αbo, predict the long build-up section composite drilling inclination angle cumulative deviation Δα according to the build-up section length Lh and the composite drilling inclination change rate Kr, and adjust the build-up section composite drilling starting point inclination angle αbs and the build-up section composite drilling ending point inclination angle αbe according to the inclination angle cumulative deviation Δα and the build-up section inclination angle αbo.

[0027] The inclination angle α is close to the inclination angle αbe corresponding to the end point of the build-up section composite drilling, and is converted into a sliding drilling mode, the inclination angle α is adjusted to the inclination angle αbs corresponding to the starting point of the build-up section composite drilling, and the drilling of the build-up section is ended until the drilling of the build-up section is ended.

[0028] Compared with the prior art, the present application has the following beneficial effects:

[0029] The long build-up section composite drilling speed-up method provided by the present application helps to improve the long build-up section composite drilling ratio, reduce the alternating frequency of drilling modes, significantly improve the long build-up section drilling speed, extend the output power of the screw drill and prolong its service life while improving the speed, reduce the frequency of tripping and replacing the drill, significantly improve the composite drilling speed and single drilling footage, help to reduce the hole tortuosity, significantly improve the long build-up section hole trajectory quality, and reduce the drilling difficulty of the lower well section and the difficulty of casing in the completion stage.

[0030] The speed-up system of the long build-up section composite drilling speed-up method provided by the present application divides the system into a composite drilling inclination rate acquisition module, an inclination angle adjustment module and a build-up section drilling speed-up module, adopts the modularization idea to make each module independent of each other, and facilitates unified management of each module. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0032] Figure 1 The basic steps of the balance trend angle build-up rate prediction method of the present application.

[0033] Figure 2The step of predicting the inclination change rate of the composite drilling of the sliding guide drilling system of the application.

[0034] Figure 3 The long build-up section to-be-drilled track optimization design and control process matched with the composite drilling and the sliding guide drilling system of the application.

[0035] Figure 4 The long build-up section composite drilling speed-up technical solution design and implementation process of the application.

[0036] Figure 5 The long build-up section to-be-drilled track optimization design schematic diagram matched with the composite drilling and the sliding guide drilling system of the application. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the embodiments of the application clearer, the technical scheme in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are part of the embodiments of the application, rather than all the embodiments. The components of the embodiments of the application described and shown in the drawings can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the application without creative labor are within the scope of protection of the application.

[0039] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0040] In the description of the embodiments of the application, it should be noted that, if the orientation or position relationship indicated by the terms "upper", "lower", "horizontal", "inner" and the like is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship when the product of the application is usually placed, and is only for the convenience of describing the application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. In addition, the terms "first", "second" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0041] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0042] In the description of the embodiments of the present application, it should also be noted that unless specifically defined and limited, if the terms "arrange", "mount", "connect", "connect" appear, they should be understood in a broad sense, for example, they can be fixedly connected, or can be detachably connected, or integrally connected, can be mechanically connected, or can be electrically connected, can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] The present application will be described in further detail below with reference to the accompanying drawings:

[0044] The present application proposes a design and implementation method of a long stable inclination section composite drilling speed-up method, which specifically includes the following four aspects:

[0045] As shown in Figure 1 and Figure 2 , it is the specific operation steps of the well inclination change rate prediction method of the sliding guide drilling system composite drilling system of the present application:

[0046] When long stable inclination section composite drilling is carried out, it is important to accurately predict and control the well inclination change rate. At present, there is no well inclination change rate prediction method for sliding guide drilling system composite drilling. Based on the existing balanced trend build-up rate prediction method, a sliding guide drilling system composite drilling well inclination change rate prediction method is created here.

[0047] After the sliding guide drilling assembly, drilling parameters, inclination angle, drill bit and anisotropy parameters of the formation are given, as shown in Figure 2 , the basic idea and steps of the prediction method are as follows:

[0048] 1) Set the high edge tool face to 0°, and apply the balanced trend build-up rate prediction method to predict the full build-up build-up rate K0 (positive value);

[0049] 2) Set the high edge tool face to 180°, and apply the balanced trend build-up rate prediction method to predict the full build-down build-up rate K180 (negative value);

[0050] 3) Based on the characteristics that the inclination angle changes mainly and the azimuth angle changes slightly under the condition of composite drilling, the average value of the full build-up build-up rate K0 (positive value) and the full build-down build-up rate K180 (negative value) is taken as the composite drilling well inclination change rate Kr, Kr= (K0+K180) / 2.

[0051] The currently popular "three-point circle method" for predicting build-up rate can only predict the build-up rate K0 (positive value) with maximum effort to increase the inclination, but cannot predict the build-up rate K180 (negative value) with maximum effort to decrease the inclination. This limits both the build-up rate prediction function and accuracy. The balanced trend build-up rate prediction method can predict both the build-up rate K0 (positive value) with maximum effort to increase the inclination and the build-up rate K180 (negative value) with maximum effort to decrease the inclination. Its prediction accuracy is also far higher than the "three-point circle method," making it almost the only usable build-up rate prediction method in this context. Actual drilling data shows that the above-mentioned method for predicting the inclination rate change of the composite drilling system in sliding steerable drilling system has high accuracy and meets the requirements for field drilling applications.

[0052] The equilibrium trend method assumes that the build-up rate of the bottom drill string assembly should be equal to the wellbore curvature when the drilling trend angle is zero. Given a preliminary wellbore curvature K, a BHA force analysis is performed to determine the lateral force on the drill bit. and drill bit angle Then calculate the well inclination trend angle Ar. If the well inclination trend angle Ar = 0, the well inclination trend is just balanced, and the pre-given wellbore curvature K is the desired well inclination rate. If the well inclination trend angle Ar ≠ 0, the well inclination trend is not yet balanced, and the wellbore curvature must be given again and the well inclination trend angle Ar must be recalculated until the well inclination trend angle Ar = 0.

[0053] The preliminary mathematical expression for the wellbore curvature is shown in formula (1):

[0054]

[0055] The drill bit lateral force and drill bit angle The expression is shown in formula (2):

[0056] (2)

[0057] in, This represents the bending moment at the near-drill bit stabilizer. For drilling pressure; , , These are the length of the first span beam of the lower drilling assembly, the lateral uniformly distributed load, and the stability coefficient, respectively. This refers to the support height corresponding to the near-drill bit stabilizer. , All are load amplification factors for the first span of the beam; E I is the elastic modulus of the drill bit; I1 is the moment of inertia of the first span of the beam.

[0058] Well inclination trend angle The mathematical expression for is shown in formula (3):

[0059] (3)

[0060] in, The anisotropy index of the drill bit.

[0061] The specific steps for the design of sliding steerable drill string assemblies (including drill bit selection) and the optimization of drilling parameters are as follows:

[0062] The long-stable-angle section composite drilling acceleration technology mainly uses composite drilling, supplemented by sliding drilling. The key is to minimize the rate of change of the inclination angle in the composite drilling well (minimum absolute value when negative), thus improving the stabilization effect of the long-stable-angle section. The overall principle for optimizing drill string combinations (including drill bit optimization) and drilling parameters is to minimize the rate of change of the inclination angle in the composite drilling well (minimum absolute value when negative) while meeting the build-up rate requirements of sliding drilling.

[0063] The equilibrium trend build-up rate prediction method integrates a drill string assembly mechanics analysis model and a drill bit-formation interaction model. It can comprehensively analyze the impact of screw drill string structural parameters (tool diameter, bend angle, bend location, stabilizer diameter and location, tool length), drill string stabilizer diameter, drilling parameters (drill pressure), and drill bit and formation characteristic parameters on the build-up rate. Based on the equilibrium trend build-up rate prediction method, the aforementioned method for predicting the composite drilling inclination rate of a sliding steerable drilling system can be used to calculate the full-force increase build-up rate K0 (positive value), the full-force decrease build-up rate K180 (negative value), and the composite drilling inclination rate Kr.

[0064] The specific steps for the optimized design and control method of the long, stable inclination section of the drilling trajectory matched with a sliding steerable drilling system are as follows:

[0065] The overall design concept of this method is to make full use of the characteristics of slow inclination increase or slow inclination decrease in composite drilling. When the inclination change rate Kr of composite drilling is greater than 0 (slow inclination increase), the long stable inclination section is adjusted to a slow inclination increase section. When the inclination change rate Kr of composite drilling is less than 0 (slow inclination decrease), the long stable inclination section is adjusted to a slow inclination decrease section.

[0066] After completing the design of the sliding steerable drill string assembly (including drill bit selection) and optimization of drilling parameters, based on the full-force increase in inclination rate K0 (positive value), the full-force decrease in inclination rate K180 (negative value), and the composite drilling inclination change rate Kr, such as Figure 3 and Figure 4 As shown, the following ideas and steps were used to develop an optimized design and control scheme for the long, stable, inclined section of the drilling track:

[0067] 1) Based on the length of the stable inclination section Lh and the composite drilling inclination change rate Kr, estimate the cumulative deviation Δα of the composite drilling inclination angle in the long stable inclination section, Δα=Kr×Lh;

[0068] 2) According to the cumulative deviation Δα of the hole inclination angle, the design hole inclination angle αbo of the stable inclination section is determined, the corresponding hole inclination angle αbs of the composite drilling starting point of the stable inclination section (the end point of the previous well section) is determined, the corresponding hole inclination angle αbs of the composite drilling starting point of the stable inclination section is αbo-Δα, the corresponding hole inclination angle αbe of the composite drilling end point of the stable inclination section (the starting point of the sliding drilling) is determined, and the corresponding hole inclination angle αbe of the composite drilling end point of the stable inclination section is αbo+Δα;

[0069] 3) According to the drilling parameter (mainly the drilling pressure) optimization result, the composite drilling is started, and the hole inclination angle and the composite drilling hole inclination change are monitored while drilling;

[0070] 4) If the composite drilling hole inclination change rate Kr is fast (the absolute value when the negative value is referred to), the drilling parameter (mainly the drilling pressure) is re-optimized, and the composite drilling hole inclination change rate is as low as possible (the absolute value when the negative value is referred to);

[0071] 5) The hole inclination angle α and the composite drilling hole inclination change rate Kr are monitored while drilling, the hole inclination angle αbe is taken as the upper limit value (the composite drilling hole inclination change rate Kr>0) or the lower limit value (the composite drilling hole inclination change rate Kr<0) of the long stable inclination section hole inclination angle, and if the bottom hole inclination angle α is close to the upper limit value (or the lower limit value), the sliding drilling mode is converted, and the hole inclination angle α is adjusted to αbs;

[0072] 6) The steps 3)~5) are repeated until the drilling of the stable inclination section is completed.

[0073] The implementation process of the long stable inclination section composite drilling speed-up method proposed in the application is as follows:

[0074] The screw drill is a kind of downhole power drill most widely used in the field of oil drilling, and the main function is to convert the hydraulic energy carried by high-pressure drilling fluid into mechanical energy to drive the drill bit to break rocks. According to the structure and working principle of the screw drill, the output torque M and the output power N are only related to the working pressure drop Δp and the working displacement Q, that is, the output torque M=ΔpQ 2 , and the output power N=ΔpQ 3 . Compared with the turbine drill, the output torque and the rotating speed of the screw drill are independent of each other in a larger load range, and have good overload capacity. Within the rated displacement and working pressure drop range, appropriately increasing the working displacement and working pressure drop of the screw drill can significantly improve the output torque M and the output power N, which is helpful to improve the drilling speed.

[0075] Taking the most commonly used 5LZ172×7.0 type screw drill as an example, the rated displacement (maximum working displacement) is about 36L / s, and the rated working pressure drop is about 3.2MPa; the actual working displacement at the drilling site is about 30L / s, and the working pressure drop is less than 3MPa; if the working pressure drop remains unchanged, and the working displacement is increased to 33L / s (an increase of 10%), the output torque M will increase by 21%, and the output power N will increase by 33.1%; if the working displacement and working pressure drop are increased at the same time, the output torque M and output power N will continue to increase, and the drilling speed will also be significantly improved.

[0076] like Figure 5 As shown, the optimization design and control method of the drilling trajectory in the stable inclination section under the condition of slow inclination increase in composite drilling (composite drilling inclination change rate Kr>0) is taken as an example. In this case, the long stable inclination section needs to be adjusted as a whole into a slow inclination increase section. First, based on the length of the stable inclination section Lh and the inclination change rate of composite drilling Kr, the cumulative deviation of the inclination angle of composite drilling in the long stable inclination section Δα (Δα=Kr×Lh) is estimated; then, the inclination angle αbs (αbs=αbo-Δα) corresponding to the starting point of composite drilling in the stable inclination section (the end point of the inclination build-up section of the drilling trajectory) and the inclination angle αbe (αbe=αbo+Δα) corresponding to the ending point of composite drilling (the starting point of sliding drilling) are determined. It can be seen that in this case, the inclination angle at the end point of the inclination build-up section of the drilling trajectory (the starting point of composite drilling) is smaller than the inclination angle at the end point of the inclination build-up section of the pre-drilling designed trajectory, and the designed drilling trajectory needs to be converted into composite drilling mode in advance.

[0077] The present invention proposes a speed-up system for a composite drilling speed-up method for long, stable inclined sections, comprising:

[0078] A composite drilling inclination change rate acquisition module is used to acquire composite drilling parameters for long and stable inclination sections, setting the high side tool face to 0° and 180°, predicting the full-force inclination increase rate K0 and the full-force inclination decrease rate K180 based on the composite drilling parameters for long and stable inclination sections, and acquiring the composite drilling inclination change rate Kr based on the average of the full-force inclination increase rate K0 and the full-force inclination decrease rate K180.

[0079] The well inclination angle adjustment module is used to obtain the stable inclination section length Lh and the stable inclination section well inclination angle αbo, predict the cumulative deviation Δα of the composite drilling well inclination angle of the long stable inclination section based on the stable inclination section length Lh and the composite drilling well inclination change rate Kr, and adjust the well inclination angle αbs corresponding to the starting point of the composite drilling of the stable inclination section and the well inclination angle αbe corresponding to the ending point of the composite drilling of the stable inclination section based on the cumulative deviation Δα and the stable inclination section well inclination angle αbo.

[0080] The build-up section drilling speed-up module is used to monitor the hole inclination angle a and the composite drilling hole inclination rate Kr, the hole inclination angle a is close to the hole inclination angle abe corresponding to the end point of the build-up section composite drilling, and the sliding drilling mode is converted, the hole inclination angle a is adjusted to the hole inclination angle abs corresponding to the starting point of the build-up section composite drilling, until the end of the build-up section drilling; the hole inclination angle a is far away from the hole inclination angle abe corresponding to the end point of the build-up section composite drilling, the hole inclination angle a and the composite drilling hole inclination rate Kr are continuously monitored, until the end of the build-up section drilling.

[0081] (1) Composite drilling hole inclination rate prediction of sliding guide drilling system

[0082] Taking a 212.7mm borehole single bend double stabilizer sliding guide drilling assembly as an example. The default borehole parameters, drilling assembly parameters, drilling parameters, formation parameters and other calculation conditions are shown in the attached Figure 1 , and a group of calculation results are shown in Table 1.

[0083] Table 1 Φ212.7mm borehole drilling pressure and composite drilling build-up effect

[0084]

[0085] (2) Sliding guide drilling assembly design (including bit optimization) and drilling parameter optimization

[0086] Based on the above sliding guide drilling assembly mechanical model and build-up rate prediction model, the sliding drilling build-up rate and composite drilling effect under different drilling assembly parameters, drilling parameters, formation parameters and other conditions are calculated, which are shown in Tables 2-5. Based on the simulation analysis results, the drilling assembly design scheme and drilling parameter optimization scheme are shown in Table 6.

[0087] Table 2 Φ212.7mm borehole screw bend angle and composite drilling build-up effect

[0088]

[0089] Table 3 Φ212.7mm borehole screw stabilizer diameter and composite drilling build-up effect

[0090]

[0091] Table 4 Φ212.7mm borehole drill string stabilizer position and composite drilling build-up effect

[0092]

[0093] Table 5 Φ212.7mm borehole formation anisotropy index and composite drilling build-up effect

[0094]

[0095] Table 6 Φ212.7mm borehole 2 compound drilling inclination stabilizing technical scheme

[0096]

[0097] (3) Long inclination stabilizing section to-be-drilled track optimization design and control scheme matched with sliding guide drilling system

[0098] Based on the sliding guide drilling assembly and drilling parameter optimization scheme given in Table 6, the to-be-drilled track optimization design and control scheme shown in Table 7 is taken as an example. In this case, the overall performance of compound drilling is slow build-up, the well inclination change rate is 0.034° / 30m, the natural build-up rate and the inclination angle change amount reserved for the inclination stabilizing section are 2.14°, the sliding build-up section is ended at the well depth of 3881.65m, and then compound drilling and slow build-up into the target are performed. The advantage of this is to maximize the use of compound drilling, improve drilling efficiency, drill a smoother borehole, and reduce the risk of casing. Figure 2

[0099] (4) Screw drilling tool working parameter regulation and control scheme for helping long inclination stabilizing section speed up

[0100] Taking a 5LZ172x7.0 type screw drilling tool as an example, the capacity displacement is about 36L / s, and the capacity working pressure drop is about 3.2MPa; the actual working displacement on the drilling site is about 30L / s, and the working pressure drop is less than 3MPa; if the working pressure drop remains unchanged, only the working displacement is increased to 33L / s (increased by 10%), the output torque M will be increased by 21%, and the output power N will be increased by 33.1%; if the working displacement and the working pressure drop are increased at the same time, the output torque M and the output power N will continue to increase, and the drilling speed will also be significantly improved.

[0101] The above are only preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.​

Claims

1. A method for accelerating composite drilling in long, stable inclined sections, characterized in that, Includes the following steps: Obtain the composite drilling parameters for the long and stable inclined section, set the high side tool face to 0° and 180°, and predict the full-force increase inclination rate K0 and the full-force decrease inclination rate K180 based on the composite drilling parameters for the long and stable inclined section; obtain the composite drilling inclination change rate Kr based on the average of the full-force increase inclination rate K0 and the full-force decrease inclination rate K180. Obtain the length of the stable inclination section Lh and the well inclination angle αbo of the stable inclination section. Predict the cumulative deviation Δα of the well inclination angle of the long stable inclination section based on the length of the stable inclination section Lh and the well inclination change rate Kr of the composite drilling. Adjust the well inclination angle αbs corresponding to the starting point of the composite drilling of the stable inclination section and the well inclination angle αbe corresponding to the ending point of the composite drilling of the stable inclination section based on the cumulative deviation Δα of the well inclination angle and the well inclination angle αbo of the stable inclination section. While drilling, monitor the well inclination angle α and the rate of change of inclination during composite drilling Kr. When the well inclination angle α approaches the well inclination angle αbe corresponding to the end point of composite drilling in the stable inclination section, switch to sliding drilling mode and adjust the well inclination angle α to the well inclination angle αbs corresponding to the starting point of composite drilling in the stable inclination section until the end of drilling in the stable inclination section. When the well inclination angle α moves away from the well inclination angle αbe corresponding to the end point of composite drilling in the stable inclination section, continue to monitor the well inclination angle α and the rate of change of inclination during composite drilling Kr until the end of drilling in the stable inclination section. The methods for predicting the slope-increasing rate K0 and the slope-decreasing rate K180 with all-out efforts are as follows: Given a preliminary wellbore curvature K, perform BHA stress analysis to obtain the drill bit lateral force and drill bit rotation angle, and obtain the well inclination trend angle based on the drill bit lateral force and drill bit rotation angle; If the well inclination trend angle is 0, then the wellbore curvature K is given as the build-up rate; if the well inclination trend angle is not 0, then the wellbore curvature K is re-given, and the drill bit lateral force and drill bit rotation angle are re-acquired until the well inclination trend angle is 0. The expression for the cumulative deviation of the well inclination angle Δα is: Δα = Kr × Lh; the expression for the well inclination angle αbs corresponding to the starting point of the composite drilling in the stable inclination section is: αbs = αbo - Δα; the expression for the well inclination angle αbe corresponding to the ending point of the composite drilling in the stable inclination section is: αbe = αbo + Δα.

2. The method for accelerating composite drilling in long, stable inclined sections according to claim 1, characterized in that, The drill bit lateral force and drill bit angle The expression is shown in formula (1): （1） in, This represents the bending moment at the near-drill bit stabilizer. For drilling pressure; , , These are the length of the first span beam of the lower drilling assembly, the lateral uniformly distributed load, and the stability coefficient, respectively. This refers to the support height corresponding to the near-drill bit stabilizer. , All are load amplification factors for the first span of the beam; E Let I be the elastic modulus of the drill string, and I1 be the moment of inertia of the first span of the beam.

3. The method for accelerating composite drilling in long, stable inclined sections according to claim 2, characterized in that, The well inclination trend angle The mathematical expression for is shown in formula (2): （2） in, The anisotropy index of the drill bit.

4. The method for accelerating composite drilling in long, stable inclined sections according to claim 1, characterized in that, When the inclination change rate Kr>0 in the long and stable inclination section of the composite drilling, the entire long and stable inclination section is adjusted into a slowly increasing inclination section.

5. The method for accelerating composite drilling in long, stable inclined sections according to claim 1, characterized in that, When the inclination change rate Kr of the long and stable inclination section is less than 0, the long and stable inclination section is adjusted as a whole into a slowly decreasing inclination section.

6. The method for accelerating composite drilling in long, stable inclined sections according to claim 4 or 5, characterized in that, The method for accelerating long and stable inclined sections of composite drilling mainly uses composite drilling, supplemented by sliding drilling.

7. A speed-up system employing the long, stable, inclined section composite drilling speed-up method according to any one of claims 1 to 6, characterized in that, include: A composite drilling inclination change rate acquisition module is used to acquire composite drilling parameters for long and stable inclination sections, setting the high side tool face to 0° and 180°, predicting the full-force inclination increase rate K0 and the full-force inclination decrease rate K180 based on the composite drilling parameters for long and stable inclination sections, and acquiring the composite drilling inclination change rate Kr based on the average of the full-force inclination increase rate K0 and the full-force inclination decrease rate K180. The well inclination angle adjustment module is used to obtain the stable inclination section length Lh and the stable inclination section well inclination angle αbo, predict the cumulative deviation Δα of the composite drilling well inclination angle of the long stable inclination section based on the stable inclination section length Lh and the composite drilling well inclination change rate Kr, and adjust the well inclination angle αbs corresponding to the starting point of the composite drilling of the stable inclination section and the well inclination angle αbe corresponding to the ending point of the composite drilling of the stable inclination section based on the cumulative deviation Δα and the stable inclination section well inclination angle αbo. The steady-angle section drilling speed-up module is used to monitor the well inclination angle α and the composite drilling inclination change rate Kr while drilling. When the well inclination angle α approaches the well inclination angle αbe corresponding to the end point of the composite drilling in the steady-angle section, the system switches to sliding drilling mode and adjusts the well inclination angle α to the well inclination angle αbs corresponding to the start point of the composite drilling in the steady-angle section until the steady-angle section drilling ends. When the well inclination angle α moves away from the well inclination angle αbe corresponding to the end point of the composite drilling in the steady-angle section, the system continues to monitor the well inclination angle α and the composite drilling inclination change rate Kr until the steady-angle section drilling ends.

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