CN-116498294-B - Intelligent directional closed-loop regulation and control method and system for bent shell screw drilling tool assembly

CN116498294BCN 116498294 BCN116498294 BCN 116498294BCN-116498294-B

Abstract

The invention discloses an intelligent directional closed-loop regulation and control method and system for a curved shell screw drilling tool assembly, wherein the method comprises intelligent switching control of a sliding/composite drilling mode and intelligent regulation and control of a tool face, wherein the intelligent switching control of the sliding/composite drilling mode takes a single or upright post as a control object, the sliding/composite drilling length of the single or upright post to be drilled and a switching scheme between the single or upright post and the sliding/composite drilling length are intelligently designed and executed by an automatic executing mechanism, the intelligent switching between sliding/composite drilling is realized, the intelligent regulation and control of the tool face comprises the steps of changing a drilling pressure regulation and control tool face and a wellhead rotary drill string regulation and control tool face, and before the tool face regulation and control, the intelligent design of tool face regulation and control parameters are executed by an automatic executing mechanism, so that the intelligent closed-loop regulation and control of the tool face is realized. The invention can avoid repeated adjustment of a great deal of non-drilling time and improve drilling efficiency.

Inventors

LI QIAN
DENG TIANSHENG
YIN HU

Assignees

西南石油大学

Dates

Publication Date: 20260505
Application Date: 20230606

Claims (8)

1. An intelligent directional closed-loop regulation and control method for a curved shell screw drilling tool assembly is characterized by comprising intelligent switching control of a sliding/compound drilling mode and intelligent regulation and control of a tool face, The sliding/composite drilling mode intelligent switching control takes a single or upright post as a control object, intelligently designs the sliding/composite drilling length of the single or upright post to be drilled and a switching scheme between the sliding/composite drilling length and the sliding/composite drilling length, and is executed by an automatic executing mechanism to realize intelligent switching between sliding/composite drilling; The intelligent regulation and control of the tool face comprises the steps of changing the drilling pressure regulation and control tool face and the wellhead rotary drill string regulation and control tool face, and the intelligent closed-loop regulation and control of the tool face is realized by intelligently designing the tool face regulation and control parameters and executing the parameters by an automatic executing mechanism before the tool face regulation and control; the intelligent tool face regulation and control method comprises the following steps: In a mode of lifting the drill bit off the bottom of a well to adjust the tool face, based on the set bit pressure during normal sliding drilling after the tool face adjustment is completed, the tool face regulation and control in the mode of lifting the drill bit off the bottom of the well to adjust the tool face is completed by acquiring the relation between the reverse torsion angle and the bit pressure or the pressure difference of the vertical pipe and the relation between the rotation angle of the drill string at the wellhead and the change value of the tool face in the well; In a mode that the drill bit contacts the bottom hole adjusting tool face, according to the difference value between the current bit pressure and the set bit pressure interval during normal sliding drilling, the tool face regulation and control of the mode that the drill bit contacts the bottom hole adjusting tool face is completed by acquiring the relation between the anti-torsion angle and the bit pressure or the pressure difference of the vertical pipe and the relation between the rotation angle of the wellhead drill string and the change value of the bottom hole tool face; The method for acquiring the relation between the rotation angle of the wellhead drill string and the change value of the downhole tool face comprises the following steps: S31, calculating a theoretical change value of a tool face in a mode of changing the tool face by rotating a drill string through a wellhead by using a drill string dynamics model by using borehole tracks, a well structure, a drilling tool assembly, drilling fluid data, drilling pressure or hooking data during tool face adjustment and top drive rotation angle and rotation speed data during tool face adjustment of a drilling section of an adjacent well and a current well; S32, using a theoretical change value of the tool face and a parameter causing the difference between the theoretical change value and the actually measured change value of the tool face as input parameters, using the actually measured change value of the tool face as output parameters, adopting a GA-BP neural network to fit the relation between the input parameters and the output parameters, and constructing and training an intelligent tool face prediction model when the condition of the known tool face regulation parameters in the tool face mode of the wellhead rotary drill string is adjusted; S33, after the tool face intelligent prediction model meets the precision requirement, calculating a theoretical change value of the underground tool face through a drill string dynamics model by presetting a drill string wellhead rotation angle and speed, and predicting the change value of the underground tool face by adopting the trained tool face intelligent prediction model; And S34, through adjusting wellhead rotation angle and speed data, when the predicted result of the intelligent tool face prediction model and the required tool face change value are within an allowable error range, reasonable tool face regulation and control parameters are obtained.
2. The intelligent directional closed-loop control method of a curved casing screw drilling assembly of claim 1, wherein the intelligent switching control of the sliding/compound drilling mode comprises the steps of: S11, grouping the data of the adjacent well and the current well drilled section by taking the measurement interval of the MWD two tracks as a reference; S12, constructing and training an intelligent prediction model of the build rate of the sliding/composite mixed drilling section of the bent shell screw drilling tool according to each group of grouped data; s13, predicting the slope of a single or upright post to be drilled by adopting a trained slope intelligent prediction model; And S14, obtaining the optimal sliding drilling proportion of the single to be drilled or the stand column by adjusting the sliding drilling proportion data of the single to be drilled or the stand column, and performing sliding drilling and compound drilling.
3. The intelligent directional closed-loop control method for the curved shell screw drilling tool assembly according to claim 2 is characterized in that step S12 is specifically implemented by respectively calculating the lateral force and the limit curvature of a drill bit in a sliding drilling mode and a compound drilling mode of the curved shell screw drilling tool by adopting a longitudinal and transverse bending continuous beam method and a limit curvature method according to each group of grouped data, combining well track data and a sliding drilling proportion as input parameters of a GA-BP neural network, taking the actual curvature of a well track as output parameters, fitting the relation between the input parameters and the output parameters, and constructing and training an intelligent prediction model for the slope of a sliding/compound mixed drilling section of the curved shell screw drilling tool.
4. The intelligent directional closed-loop control method for the curved shell screw drilling tool assembly is characterized in that step S13 specifically comprises the steps of taking a single or upright post as a control object after a slope intelligent prediction model reaches a preset precision requirement, taking designed borehole track data and sliding/composite drilling weight as basic parameters, respectively calculating bit lateral force and limit curvature in a single or upright post sliding drilling mode to be drilled and a composite drilling mode by adopting a longitudinal and transverse bending continuous beam method and a limit curvature method, and then combining the designed borehole track data, and predicting the slope of the single or upright post to be drilled by adopting a trained slope intelligent prediction model through preset single or upright post sliding drilling proportion data.
5. The intelligent directional closed-loop control method for the bent shell screw drilling tool assembly according to claim 2, wherein step S14 is characterized in that through adjusting sliding drilling proportion data of a single to be drilled or a stand column, when a prediction result of a slope intelligent prediction model is consistent with a curvature of a designed borehole track, an optimal sliding drilling proportion of the single to be drilled or the stand column is obtained, after that, the single to be drilled or the stand column is firstly subjected to sliding drilling, the designed sliding drilling footage is completed, then the composite drilling is carried out, and an automatic executing mechanism obtains and automatically executes a sliding/composite drilling mode switching scheme of the single to be drilled or the stand column.
6. The intelligent directional closed-loop control method of a curved casing screw drilling assembly according to claim 1, wherein the obtaining the relationship between the anti-twist angle and the weight on bit or riser differential pressure comprises the steps of: s21, reversing the relation between the reactive torque of the screw drilling tool of the bending shell and the change value of the drill weight or the change value of the vertical pressure by using the borehole track, the well structure, the drilling tool assembly, the drilling fluid data, the change value of the drill weight or the change value of the vertical pressure of the adjacent well and the current well drilled section and the change data of the reverse torsion angle of the screw drilling tool after the change of the drill weight or the vertical pressure by using a drill string dynamics model; S22, calculating the reverse torsion angle change value of the bent shell screw drilling tool through the drill string dynamics model on the premise of knowing the drilling pressure or vertical pressure change value, or reversing the drilling pressure or vertical pressure change value through the drill string dynamics model on the premise of knowing the reverse torsion angle change value of the bent shell screw drilling tool.
7. The method of intelligent directional closed-loop control of a curved casing screw drilling tool assembly of claim 6, wherein the intelligent control of the tool face comprises the steps of: Under the mode that the drill bit is lifted off the bottom of a well to adjust the tool face, based on the set bit pressure during normal sliding drilling after the tool face is adjusted, calculating the reverse torsion angle of the screw drill with a shell after the drill bit reaches the set bit pressure during normal sliding drilling before the drill bit contacts the bottom of the well through the steps S21-S22, adding the reverse torsion angle of the screw drill to the target tool face, subtracting the current tool face from the reverse torsion angle of the screw drill, obtaining the angle of the tool face which is required to rotate when the drill string is rotated at the well, calculating the rotation angle and the speed of the well through the steps S31-S34, executing the rotation angle and the speed of the well through an automatic executing mechanism, and lowering the drill string to reach and maintain the bit pressure instruction during normal sliding drilling, thereby completing the regulation of the tool face in the mode that the drill bit is lifted off the bottom of the well; In the mode that the drill bit contacts the bottom hole, according to the difference value between the current weight and the set weight section during normal sliding drilling, whether the tool face angle reaches the target tool face can be judged through S21-S22, the reverse torsion angle of the bent shell screw drilling tool can be changed through changing the weight of the drill bit, the change value of the weight of the drill bit is calculated and executed by an automatic executing mechanism on the premise that the tool face reaches the target tool face through changing the weight of the drill bit, if the tool face can not reach the target tool face through changing the weight of the drill bit, the wellhead rotation angle and rotation speed are calculated through S31-S34 and executed by the automatic executing mechanism, and the tool face regulation and control under the mode that the drill bit contacts the bottom hole is completed.
8. An intelligent directional closed-loop regulation and control system of a curved shell screw drilling tool assembly for realizing the intelligent directional closed-loop regulation and control method of the curved shell screw drilling tool assembly according to any one of claims 1-7, which is characterized by comprising a dynamic measurement system, a monitoring system, an intelligent decision system and an executing mechanism, wherein, The dynamic measurement system comprises an MWD (measurement and logging) system, a comprehensive logging system and a top drive main shaft rotary positioning system, wherein the MWD system is used for measuring the well inclination angle, the azimuth angle and the tool face angle of the screw drilling tool in a sliding drilling state; the monitoring system comprises a well deviation monitoring module, an azimuth monitoring module and a tool face monitoring module, wherein the well deviation monitoring module and the azimuth monitoring module are used for comparing real drilling data with designed borehole tracks; The intelligent decision system is used for intelligently setting the control parameters of the well track; The execution mechanism is used for executing the track control parameters formulated by the intelligent decision system.

Description

Intelligent directional closed-loop regulation and control method and system for bent shell screw drilling tool assembly Technical Field The invention relates to the technical field of oil and gas field development, in particular to an intelligent directional closed-loop regulation and control method and system for a curved shell screw drilling tool assembly. Background Currently, the directional well and horizontal well borehole trajectory control drilling tool assemblies mainly comprise a curved casing screw drilling tool assembly and a rotary steering drilling tool assembly. The curved casing screw drilling assembly is still the most commonly used well bore trajectory control drilling assembly in terms of its economy and adaptability to downhole harsh environments such as high temperature and high pressure. In the process of controlling the borehole track of the bent shell screw drilling tool assembly, the build-up rate of the drilling tool assembly is difficult to accurately predict because the build-up rate of the drilling tool assembly is influenced by a plurality of parameters such as the drilling tool structure, drilling engineering parameters, drilled borehole track parameters, stratum parameters, drilling fluid performance and the like. In order to extend the borehole trajectory along a predetermined path, during the actual drilling process, the field constructor compares the borehole trajectory design data with the actual borehole trajectory data measured by the MWD, and then determines the borehole trajectory control parameters such as the drilling mode, weight on bit, toolface angle, etc. of the next wellbore section. However, due to the existence of the MWD zero length, the borehole track measurement data has hysteresis, so that the formulation of the borehole track control parameters is always in a 'catch-up' mode and a 'correction' mode for designing the borehole track, the accuracy and timeliness of the borehole track control are affected, and the experience requirements on field construction personnel are higher. The adjustment of the tool face during the control of the borehole trajectory of the curved casing screw drill assembly is very frequent. The traditional tool face adjustment accuracy is influenced by factors such as stratum, well track, well structure, drilling tool assembly, drilling fluid system, construction parameters, screw drilling tool reverse torsion angle, experience of constructors and the like, so that the traditional tool face adjustment accuracy is difficult to be in place in one step, a large amount of abnormal drilling time is consumed for repeated adjustment, and the drilling time is reduced. Disclosure of Invention The invention aims to provide an intelligent directional closed-loop regulation and control method and system for a curved-shell screw drilling tool assembly, which are used for solving the technical problems of reducing the dependence on experience of constructors in the curved-shell screw drilling tool well track control process, improving the well track control precision of a horizontal well of a directional well, shortening the drilling period and realizing the closed-loop control of the well track. The invention adopts the following technical scheme that the intelligent directional closed-loop regulation and control method of the curved shell screw drilling tool assembly comprises intelligent switching control of a sliding/compound drilling mode and intelligent regulation and control of a tool face, The sliding/composite drilling mode intelligent switching control takes a single or upright post as a control object, intelligently designs the sliding/composite drilling length of the single or upright post to be drilled and a switching scheme between the sliding/composite drilling length and the sliding/composite drilling length, and is executed by an automatic executing mechanism to realize intelligent switching between sliding/composite drilling; the intelligent regulation and control of the tool face comprises the step of changing the drilling pressure regulation and control tool face and the step of regulating and controlling the tool face of the wellhead rotary drill string, and the intelligent closed-loop regulation and control of the tool face is realized by intelligently designing the tool face regulation and control parameters and executing the parameters by an automatic executing mechanism before the tool face regulation and control. Further, the intelligent switching control of the sliding/compound drilling mode comprises the following steps: S11, grouping the data of the adjacent well and the current well drilled section by taking the measurement interval of the MWD two tracks as a reference; S12, constructing and training an intelligent prediction model of the build rate of the sliding/composite mixed drilling section of the bent shell screw drilling tool according to each group of grouped data; s13, predicting the slope of a single or u