CN-121976789-A - Drill bit drilling numerical control system and control method thereof

CN121976789ACN 121976789 ACN121976789 ACN 121976789ACN-121976789-A

Abstract

The invention discloses a drill bit drilling numerical control system and a control method thereof, which relate to the technical field of drill bit control and comprise the following steps: and acquiring drilling load variation, rotation resistance variation and drilling tool axial movement variation in the drilling process, identifying the contact establishment process between the cutter teeth of the drill bit and the hole bottom stratum according to the variation relation of the three, and determining that the cutter teeth of the drill bit and the stratum form rock breaking contact when the drilling load is increased and the rotation resistance is synchronously increased within a preset time interval relative to a stable drilling state and the axial advancing speed of the drilling tool is reduced and changed, and determining the rock breaking contact as a rock breaking behavior unit. According to the invention, through identifying rock breaking contact, repeating rock breaking behaviors, local impact rock breaking behaviors and composite rock breaking behaviors in the drilling process and carrying out differential accumulation on the drill bit drilling number according to different types of rock breaking behavior units, the drilling number characterization result can be more close to the stress and abrasion process of the drill bit under the actual working condition.

Inventors

Wei Jiusen
LIU WEI
LI FENGJIAO
FAN YUDONG

Assignees

胜利油田万和石油工程技术有限责任公司

Dates

Publication Date: 20260505
Application Date: 20260402

Claims (9)

1. A method of controlling a drill bit, comprising: Step one, acquiring drilling load variation, rotation resistance variation and drilling tool axial movement variation in the drilling process, identifying the contact establishment process between the bit cutter tooth and the hole bottom stratum according to the variation relation of the drilling load variation, determining that the bit cutter tooth and the stratum form rock breaking contact when the drilling load is increased and the rotation resistance is synchronously increased within a preset time interval relative to a stable drilling state and the axial advancing speed of the drilling tool is reduced and changed, and determining the rock breaking contact as a rock breaking behavior unit; Continuously recognizing the contact change between the drill bit and the rock stratum after recognizing the rock breaking behavior unit, and determining the contact reestablishing process as a new rock breaking behavior unit when the drill bit contacts, breaks away from and contacts the rock stratum again in the continuous drilling process so as to recognize repeated rock breaking behaviors caused by drilling tool vibration; Determining distribution of each rock breaking action unit in the circumferential direction of the drill bit according to the rotation angle position of the drill bit, judging that the drill bit is in an eccentric rotation state when a plurality of rock breaking action units are distributed in the same circumferential section in the continuous rotation process, and determining the rock breaking action units generated in the circumferential section as local impact rock breaking action units; Step four, after the local impact rock breaking behavior unit is identified, when drilling load is reduced after impact contact is finished and rotation resistance is kept higher than rotation resistance level corresponding to a stable rock breaking stage, determining that sliding cutting occurs between a drill bit and a rock stratum, and determining the impact contact and subsequent sliding cutting as a composite rock breaking behavior unit; and fifthly, accumulating the drilling bit drilling numbers according to different types of rock breaking behavior units, wherein the rock breaking behavior units formed by stable contact are counted as basic drilling numbers, the repeated rock breaking behavior units are counted as superposition drilling numbers, and the local impact rock breaking behavior units and the composite rock breaking behavior units are counted as enhancement drilling numbers, so that the corrected drilling numbers are obtained.
2. The method of claim 1, wherein the identification of the broken rock contact in step one comprises the steps of: In the continuous drilling process, a dynamic reference section is constructed by a drilling section in a stable drilling state before the current drilling moment, and a drilling load datum level, a rotation resistance datum level and a drilling tool axial propelling speed datum level are determined in the dynamic reference section; Establishing a contact judging window after the dynamic reference section, and acquiring drilling load variation, rotation resistance variation and drilling tool axial propelling speed variation in the contact judging window; When the drilling load variation, the rotation resistance variation and the drilling tool axial propelling speed variation simultaneously meet the rock breaking contact judgment conditions in the same contact judgment window, determining that the cutter teeth of the drill bit form rock breaking contact with the rock stratum and form a rock breaking behavior unit; reconstructing a dynamic reference section according to a preset updating period in the continuous drilling process, and redetermining a drilling load datum level, a rotation resistance datum level and a drilling tool axial propelling speed datum level according to the updated dynamic reference section.
3. The method of claim 1, wherein the step of repeating the identification of the rock breaking action comprises the steps of: After identifying the rock breaking behavior unit, continuously acquiring the rotation angle variation of the drill bit, and carrying out sectional recording on the continuously acquired rotation angle variation according to a preset angle interval to form a plurality of angle variation sections; Recording drilling load variation and rotation resistance variation in each angle variation section respectively, and determining a contact state according to variation directions of the drilling load variation and the rotation resistance variation, wherein the drilling load variation and the rotation resistance variation increase corresponding contact establishment states at the same time, and the drilling load variation and the rotation resistance variation decrease corresponding contact release states at the same time; Continuously judging the contact state in the plurality of angle change sections according to the rotation sequence, and forming a contact state sequence when the contact establishment state, the contact release state and the contact establishment state again occur in the continuous angle change sections in sequence; When the number of angle change sections corresponding to the formed contact state sequence reaches a preset angle section continuity threshold value, and the rotation angle range corresponding to the contact establishment state and the re-contact establishment state is not smaller than the minimum repeated rock breaking angle range, determining the angle change section corresponding to the re-contact establishment state as a repeated rock breaking contact section, and determining the contact process corresponding to the repeated rock breaking contact section as a new rock breaking behavior unit; and when a contact state sequence meeting the continuity threshold value of the angle section is not formed in the continuous angle change section, or the corresponding rotation angle range between the contact establishment state and the re-contact establishment state is smaller than the minimum repeated rock breaking angle range, the corresponding contact process is not determined to be a new rock breaking behavior unit.
4. The method of claim 1, wherein the identification of the eccentric rotation and partial impact rock breaking action unit in the third step comprises the steps of: In the continuous drilling process, dividing a plurality of rotation period sections according to a preset rotation period, and dividing a plurality of circumferential angle sections in each rotation period section according to a preset circumferential angle interval; Recording the corresponding rotation angle position, drilling load variation and rotation resistance variation of the rock breaking behavior unit in each circumferential angle section, and determining the product of the drilling load variation and the rotation resistance variation as a unit impact energy value corresponding to the rock breaking behavior unit; mapping rock breaking behavior units in the same circumferential angle section in a plurality of rotation period sections to the same circumferential coordinate section, and respectively accumulating the number of the rock breaking behavior units and the unit impact energy value in each circumferential angle section to form Zhou Xiangpo rock number accumulated values and circumferential impact energy accumulated values corresponding to each circumferential angle section; Comparing the circumferential angle section positions corresponding to the largest cumulative value of the circumferential rock breaking quantity between the adjacent rotation period sections, and determining the corresponding circumferential angle section as a phase locking circumferential section when the angle deviation between the largest corresponding circumferential angle section positions in the continuous multiple rotation period sections is not greater than a preset phase locking angle threshold value; When the circumferential impact energy accumulated value of the phase locking circumferential section is larger than the circumferential impact energy accumulated values of the other circumferential angle sections and the number of rock breaking action units in the phase locking circumferential section reaches a preset number threshold, the drill bit is judged to be in an eccentric rotation state, and the rock breaking action units formed in the phase locking circumferential section are determined to be local impact rock breaking action units.
5. The method of controlling drilling of a drill bit according to claim 4, wherein the identification of the unit of partial impact rock breaking behavior in the third step comprises the steps of: Acquiring the rotation angle position of the drill bit in the continuous drilling process, and dividing the rotation range of the drill bit into a plurality of circumferential angle sections according to preset angle intervals; Recording drilling load variation and rotation resistance variation corresponding to the rock breaking behavior unit in each circumferential angle section, and determining the product of the drilling load variation and the rotation resistance variation as a unit impact energy value; Overlapping and recording the unit impact energy values in the same circumferential angle section in a plurality of continuous rotation periods to form a circumferential impact energy sequence corresponding to each circumferential angle section; Determining a circumferential angle section in the circumferential impact energy sequence, wherein the energy accumulation value continuously keeps the maximum in a plurality of continuous rotation periods, and determining the circumferential angle section as a circumferential impact density stabilizing section; And when the number of the corresponding rock breaking action units in the circumferential impact density stabilizing section reaches a preset number threshold value and the rock breaking action units are all positioned in the circumferential impact density stabilizing section, determining the rock breaking action units as local impact rock breaking action units.
6. The method of claim 1, wherein the identification of the composite breaking behavior unit in the fourth step comprises the steps of: After the local impact rock breaking behavior unit is identified, recording drilling load variation and rotation resistance variation corresponding to the local impact rock breaking behavior unit, and determining the product of the drilling load variation and the rotation resistance variation as an impact energy value; Dividing a plurality of energy tracking sections in a continuous rotation angle section after impact contact is finished according to preset angle intervals, respectively recording drilling load variation and rotation resistance variation in each energy tracking section, and determining the product of the drilling load variation and the rotation resistance variation in each energy tracking section as a slip cutting energy value; Constructing an energy evolution sequence by using the sliding cutting energy values corresponding to the impact energy values and the energy tracking sections according to the rotation sequence; When the energy evolution sequence meets the condition that the impact energy value reaches a local peak value, the impact energy corresponding value in the subsequent continuous multiple energy tracking sections is in a decreasing trend relative to the impact energy peak value, and the slip cutting energy value is in an increasing trend in the continuous multiple energy tracking sections, determining the slip cutting process after the impact contact is ended as an impact slip energy transfer stage; When the impact sliding energy transfer stage forms a continuous energy transfer track in the same circumferential angle section and the energy transfer track repeatedly occurs in a plurality of continuous rotation periods, the impact contact and the subsequent sliding cutting are determined as a composite rock breaking behavior unit.
7. The method for controlling the drilling bit according to claim 1, wherein the determination of the corrected drilling bit in the fifth step comprises the steps of respectively obtaining drilling load variation, rotation resistance variation and continuous rotation angle range corresponding to each type of rock breaking behavior unit after identifying a rock breaking behavior unit, a repeated rock breaking behavior unit, a local impact rock breaking behavior unit and a composite rock breaking behavior unit formed by stable contact, and determining the product of the drilling load variation and the rotation resistance variation as a rock breaking action value; Weighting calculation is carried out on rock breaking action values corresponding to various rock breaking action units according to preset rock breaking contribution coefficients so as to determine rock breaking contribution degrees of the rock breaking action units; Mapping the rock breaking contribution degree to a circumferential angle section of the drill bit according to the rotation angle position, and accumulating rock breaking contribution degree accumulated values corresponding to each circumferential angle section in a plurality of continuous rotation periods to form circumferential abrasion contribution distribution; And finally accumulating equivalent drilling values respectively converted from a rock breaking action unit, a repeated rock breaking action unit, a local impact rock breaking action unit and a composite rock breaking action unit which are formed by stable contact in each circumferential angle section to obtain the corrected drilling number of the drill bit.
8. The method of claim 7, wherein the step five of applying the correction bit number comprises the steps of: After obtaining the corrected drilling number, calculating the increase rate of the corrected drilling number according to the change quantity of the corrected drilling number in a plurality of continuous drilling sampling intervals, and comparing the corrected drilling number with a preset drill life interval to determine the current working state of the drill; when the corrected drilling number is positioned in a preset normal use interval and the increase rate of the corrected drilling number is not greater than a preset increase rate threshold, maintaining the current drilling load, the rotation speed and the axial pushing speed of the drilling tool; When the corrected drilling number is positioned in a preset accelerated wear zone or the increase rate of the corrected drilling number is larger than a preset increase rate threshold, reducing the drilling load and the axial advancing speed of the drilling tool according to a preset adjusting amplitude, and simultaneously reducing the rotating speed of the drilling tool; When the corrected drilling number enters a preset failure critical interval, generating a bit replacement instruction and limiting further lifting of drilling load and rotation speed; And when the corrected drilling number enters a preset failure critical interval and the corrected drilling number increasing rate is larger than a preset abnormal increasing threshold value in a plurality of drilling sampling intervals, generating a protection stopping instruction to terminate the current drilling process.
9. A drill bit control system, characterized in that the control system employs the control method according to any one of claims 1-8.

Description

Drill bit drilling numerical control system and control method thereof Technical Field The invention relates to the technical field of drill bit control, in particular to a drill bit numerical control system and a control method thereof. Background In the existing drilling operation process, the use state of the drill bit is generally managed through the number of drilling holes, the drilling time, accumulated footage or experience service life, and the management mode can meet basic use requirements under the conventional working condition and has the characteristics of simplicity in implementation and convenience in deployment; In the actual drilling process, the action state between the drill bit and the rock stratum is not always in a stable contact state, particularly under the working conditions of deep hole drilling, long drill rod drilling or complex rock stratum, a drilling tool system is easily influenced by the common influences of drilling load, rotation resistance and drilling tool posture change, and various rock breaking behaviors such as contact establishment, contact separation, re-contact, local impact, follow-up sliding cutting and the like are generated; Based on the above, the existing drilling control technology has the requirement of further refining the bit use state identification mode, namely, different rock breaking behaviors are distinguished by combining drilling load change, rotation resistance change, drilling tool axial movement change and bit circumferential position distribution in the drilling process, and a drilling number accumulated result which is more close to the actual rock breaking process is formed on the basis, and further, if the corrected drilling number corresponding to different types of rock breaking behaviors is used for judging the bit working state and adjusting drilling parameters, the method is beneficial to improving the refinement degree of the bit use management and enhancing the stability and controllability of the drilling process, so that the invention provides a bit drilling number control system and a bit drilling number control method. Disclosure of Invention The invention aims to provide a drill bit numerical control system and a control method thereof, which are used for solving the problems in the background art. The invention can be realized by the following technical scheme that the drill bit numerical control method comprises the following steps: Step one, acquiring drilling load variation, rotation resistance variation and drilling tool axial movement variation in the drilling process, identifying the contact establishment process between the bit cutter tooth and the hole bottom stratum according to the variation relation of the drilling load variation, determining that the bit cutter tooth and the stratum form rock breaking contact when the drilling load is increased and the rotation resistance is synchronously increased within a preset time interval relative to a stable drilling state and the axial advancing speed of the drilling tool is reduced and changed, and determining the rock breaking contact as a rock breaking behavior unit; Continuously recognizing the contact change between the drill bit and the rock stratum after recognizing the rock breaking behavior unit, and determining the contact reestablishing process as a new rock breaking behavior unit when the drill bit contacts, breaks away from and contacts the rock stratum again in the continuous drilling process so as to recognize repeated rock breaking behaviors caused by drilling tool vibration; Determining distribution of each rock breaking action unit in the circumferential direction of the drill bit according to the rotation angle position of the drill bit, judging that the drill bit is in an eccentric rotation state when a plurality of rock breaking action units are distributed in the same circumferential section in the continuous rotation process, and determining the rock breaking action units generated in the circumferential section as local impact rock breaking action units; Step four, after the local impact rock breaking behavior unit is identified, when drilling load is reduced after impact contact is finished and rotation resistance is kept higher than rotation resistance level corresponding to a stable rock breaking stage, determining that sliding cutting occurs between a drill bit and a rock stratum, and determining the impact contact and subsequent sliding cutting as a composite rock breaking behavior unit; and fifthly, accumulating the drilling bit drilling numbers according to different types of rock breaking behavior units, wherein the rock breaking behavior units formed by stable contact are counted as basic drilling numbers, the repeated rock breaking behavior units are counted as superposition drilling numbers, and the local impact rock breaking behavior units and the composite rock breaking behavior units are counted as enhancement drilling numbers, so that