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CN-121997474-A - Well Duan Taoguan design method with interval smaller than 6m based on well group borehole track

CN121997474ACN 121997474 ACN121997474 ACN 121997474ACN-121997474-A

Abstract

The invention discloses a well Duan Taoguan design method based on well group well tracks, which belongs to the technical field of oil and gas well drilling and completion engineering design and construction, and comprises the steps of knowing the space position and the minimum space of each well, using a magnetic detection tool while drilling, detecting magnetic force lines of surrounding well casing strings in the drilling process, calculating relative position data of the well drilling holes and the surrounding well and returning the relative position data to the ground, calculating the bending centralizing degree of each well straight section casing string according to the returned relative position data, adjusting the outer diameter size and the torsion direction of a centralizer according to the distance between the well drilling holes and the adjacent well, completing drilling, dredging the well, recording and analyzing friction data and friction distribution conditions in the well dredging process, determining a main barrier-around well section when the maximum friction is in a barrier-around well section, and using a larger casing. The invention can optimize the design of the sleeve and reduce the risk of failure of the seal of the screw thread of the sleeve.

Inventors

  • GAO YONGWEI
  • LI XIAOLI
  • XU CHAOYANG
  • LI QIANCHUN
  • LIU KEQIANG
  • ZHOU WENBING
  • WU LEI
  • WANG PEIFENG
  • FANG DAN
  • LI JING

Assignees

  • 中国石油天然气集团有限公司
  • 中国石油集团川庆钻探工程有限公司

Dates

Publication Date
20260508
Application Date
20241105

Claims (10)

  1. 1. A method of designing a well Duan Taoguan having a pitch less than 6m based on a well group borehole trajectory, comprising the steps of: Step a, knowing the space position and the minimum distance of each borehole, and detecting magnetic lines of force of surrounding well casing strings in the drilling process by using a magnetic detection tool while drilling; step b, calculating relative position data of the well bore hole and surrounding well bores, and transmitting the data back to the ground; Step c, calculating the bending centralizing degree of each well section casing string according to the returned relative position data; Step d, adjusting the outer diameter size and the torsion direction of the centralizer according to the distance between the drilled well and the adjacent well; E, completing drilling, well dredging, recording and analyzing friction data and friction distribution conditions in the well dredging process; and f, when the maximum friction is in the barrier-surrounding well section, determining the main barrier-surrounding well section, and using a large sleeve with a coupling.
  2. 2. The method for designing the well Duan Taoguan with the interval smaller than 6m based on the well group borehole track as set forth in claim 1, wherein in the step a, the use environment of a magnetic detection tool is reasonably selected to prevent the occurrence of excessive barrier-surrounding drilling curvature.
  3. 3. The method for designing the well Duan Taoguan with the interval smaller than 6m based on the well group borehole track as claimed in claim 1, wherein in the step a, a drilling tool structure used in the drilling process comprises a PDC drill bit, a screw rod, a reducing centralizer, a magnetic detection type anti-collision tool, an MWD, a drill collar, a weighted drill rod and a drill rod.
  4. 4. The method of designing a well Duan Taoguan having a well group trajectory spacing of less than 6m based on claim 1, wherein in step d, drilling monitoring is continued by changing the outside diameter size and twist position of the centralizer when the wellbore distance is 8-10m from the adjacent well.
  5. 5. The method of designing a well Duan Taoguan having a pitch less than 6m based on a well string trajectory as defined in claim 1, wherein in step d, when the well string is positioned 5-6m away from the adjacent well, the outer diameter size and twist position of the centralizer are changed again to allow the well string to quickly break away from its original trend.
  6. 6. The method for designing a well Duan Taoguan with a pitch less than 6m based on a well string trajectory as set forth in claim 1, wherein in step e, the drill structure used is a full size drill bit + a weighted drill rod + a full size centralizer + a drill rod.
  7. 7. The method of designing wells Duan Taoguan with a pitch of less than 6m based on the well string trajectory as claimed in claim 1, wherein in step f, a large collar is used at each 100m above and below the barrier-surrounding wellbore section.
  8. 8. The method of designing a well Duan Taoguan based on a well group wellbore trajectory at a spacing of less than 6m, as set forth in claim 1, wherein the collar has a larger casing diameter of 162mm.
  9. 9. The method of designing a well Duan Taoguan based on a cluster of well trajectories with a spacing of less than 6m as set forth in claim 4, wherein the centralizer outer diameter varies from 215mm to 210mm and the twist position varies by 5 to 6 degrees when the wellbore distance is 8 to 10m adjacent the well.
  10. 10. The method of designing a well Duan Taoguan having a pitch less than 6m based on a well string trajectory as claimed in claim 5, wherein in step d, the outer diameter of the centralizer is changed from 210mm to 206mm and the twist sense is changed by 6-8 degrees when the well string is positioned 5-6m adjacent to the well.

Description

Well Duan Taoguan design method with interval smaller than 6m based on well group borehole track Technical Field The invention relates to the field of oil and gas well drilling and completion engineering design and construction, in particular to a well Duan Taoguan design method with a distance smaller than 6m based on a well group borehole track. Background In recent years, the number of shale oil and gas adopted well group development modes is increasing year by year, limited by the enhancement of environmental protection policies. In recent years, the development of the Changqing shale oil adopts multi-layer, large well cluster and three-dimensional development modes, wherein a Hua H100 platform single platform deploys 31 horizontal wells, the well head distance is 8m, the well head row distance is 31m, and the collision prevention pressure of the diameter section and the inclined well section is huge. The well of the oil production ten factories is closed at the white 409 well region, 73 well straight fixed wells and highly inclined wells are deployed at 18-78 well sites, the well mouth distance is 4-8m, and the anti-collision difficulty of the inclined well section is high. The construction of the old area adjusting encryption well is in the original well site, the well site area is limited, and the collision prevention between the straight well sections is difficult in the new well drilling process. In 2021, the group company is used for in-situ conversion of Changqing shale oil into small well spacing horizontal well cluster drilling and completion technical test projects, and the requirement on anti-collision tools is urgent. Meanwhile, for the drilling data in the 90 th and the past of the last century, the data accuracy is poor or even lost due to the influence of the long-term and preservation mode, and the anti-collision working pressure is unprecedented in the secondary operation. However, when the magnetic detection type anti-collision tool detects an adjacent well casing, the borehole track must be changed rapidly, so that the local well section is bent obviously, the friction is larger, and the safety of the casing is affected, so that the use is limited. Therefore, the casing running quality is improved while the research and development of the passive precise magnetic detection anti-collision tool are carried out, so that the requirements of different production requirements on the application of the passive magnetic detection anti-collision tool and the sealing of a shaft are met, and meanwhile, the industry blank of the technology is filled. The method is widely technically inquired for the problem of safely putting the casing after the underground anti-collision operation construction, and the following similar technical measures are adopted at present: Firstly, aiming at the three-dimensional development well patterns formed along with the gradual formation of Fuling shale gas fields, the anti-collision analysis of a main body area is more important in the well drilling construction in the complex space between an upper layer and a lower layer and between wells. Taking a focal-plane X6HF well as an example, in order to prevent the occurrence of sleeve collision accidents, conventional scanning and three-dimensional scanning verification are carried out on the well design track, and the anti-collision requirement of the shortest distance of more than 40m is met by adjusting the track to reach the depth of more than 2000-3000 m. The existing adjustment deployment well is positioned in the main body area of the coke dam, and the anti-collision scanning analysis flow can be used in the Jiangdong and flat bridge areas, can also be popularized in the market, and can be repeatedly popularized and used. Secondly, an adjacent well detection technology based on a ground penetrating radar technology is provided for realizing active ranging guiding drilling, and simulation research is carried out on the working principle and the detection method of the adjacent well detection technology. By establishing an underground radar detection model, theoretical analysis is carried out aiming at the problems of propagation medium absorption boundary, a dispersion medium model, an iterative algorithm and the like, an antenna simulation model is established by using XFDTD, and simulation research is carried out on the propagation condition of radar signals in a stratum in a time domain range. The result shows that the ground penetrating radar technology can be used for underground adjacent well detection, and particularly, accurate anti-collision can be realized when the adjacent well is close. The third application number 202010467593.8 is a method and a system for evaluating safety of casing running of shale gas long-section horizontal well, and the method and the system are technically characterized in that a three-dimensional soft rod tubular column model is used for carrying out sensitivity analysis on a