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CN-121993026-A - Well group underground drilling anti-collision detection method

CN121993026ACN 121993026 ACN121993026 ACN 121993026ACN-121993026-A

Abstract

The invention belongs to the technical field of oil and gas well drilling and completion engineering design and construction, and particularly provides a well group underground drilling anti-collision detection method, which comprises the following steps of determining a target site; drilling a base well in a target site, drilling a plurality of adjacent wells around the base well, putting a casing in the adjacent wells, putting an anti-collision tool in the base well, starting the anti-collision tool to magnetically detect the casing in the adjacent wells, comparing the magnetic detection result with actual data of the casing in the adjacent wells, and correcting until the magnetic detection result is consistent with the actual data, thus completing anti-collision detection. The invention solves the problems that the effect verification of the large well group drilling anti-collision tool is not performed systematically and the development progress of the large well group drilling anti-collision tool is reduced, provides data for the improvement of the anti-collision tool, improves the magnetic detection effect of the anti-collision tool, shortens the improvement time of the anti-collision tool, reduces the development cost and fills the blank of the related technology at present.

Inventors

  • GAO YONGWEI
  • ZHANG XUSHUAI
  • ZHAO WENZHUANG
  • CHEN CAIZHENG
  • YANG XIANLI
  • WANG JUNCHUANG
  • CHEN QIAN
  • LI KUNPENG
  • CHEN CHUNYU
  • LI YANWEI

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
20241107

Claims (10)

  1. 1. A well group underground drilling anti-collision detection method is characterized by comprising the following steps: s1, determining a target site; S2, drilling a base well (1) in a target site; S3, drilling a plurality of adjacent wells (2) around the base well (1); s4, a casing (4) is put into the adjacent well (2); S5, a collision prevention tool (3) is put into the base well (1); S6, starting an anti-collision tool (3) to perform magnetic detection on the sleeve (4) in the adjacent well (2), comparing the magnetic detection result with actual data of the sleeve (4) in the adjacent well (2), and correcting the result until the result is consistent with the actual data, so that anti-collision detection is completed.
  2. 2. The method for detecting the collision avoidance of a well group downhole drilling as claimed in claim 1, wherein the target field is located in an open area with stable geomagnetic field.
  3. 3. The method of claim 2, wherein the subsurface of the target site is a stable and 80-120m deep layer of yellow soil.
  4. 4. The method for detecting the anti-collision of the underground drilling of the well group according to claim 1, wherein the step S2 is characterized in that 1 deep hole is drilled firstly, the inner diameter of the deep hole is 420-450mm, the depth of the deep hole is 80-120 m, and then a PVC pipe is put in, so that the well cementation is performed.
  5. 5. The method for detecting the anti-collision of the underground drilling of the well group according to claim 1, wherein the step S3 is characterized in that a plurality of adjacent wells (2) are drilled around the base well (1), a plurality of deep holes with different relative orientations are drilled around the base well (1), and PVC pipes are placed in the deep holes to fix the well.
  6. 6. The method for detecting the collision avoidance of well group downhole drilling as claimed in claim 5, wherein the number of adjacent wells (2) in the step S3 is 8-10.
  7. 7. The method for detecting the anti-collision of the underground drilling of the well group according to claim 5, wherein the inner diameter of each adjacent well (2) is 420-450mm, the depth is 80-120 m, and the distance between two adjacent wells (2) is 8-30m.
  8. 8. The method for detecting the collision avoidance of a well group downhole drilling as claimed in claim 4 or 5, wherein the PVC pipe has an outer diameter of 320mm and an inner diameter of 300mm.
  9. 9. The method for detecting the underground drilling collision prevention of the well group according to claim 1, wherein a baffle (5) is arranged around the opening of the base well (1).
  10. 10. The method for detecting the collision prevention of underground drilling of a well group according to claim 1, wherein a plurality of reducing centralizers are connected to the casing (4).

Description

Well group underground drilling anti-collision detection method Technical Field The invention belongs to the technical field of oil and gas well drilling and completion engineering design and construction, and particularly relates to a well group underground drilling anti-collision detection method. 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. But the current domestic mature magnetic positioning tool mainly meets SAGD thick oil exploitation technology, such as RMS-I developed by western drilling. The basic principle of the similar products is that the similar products are all active magnetic positioning tools, when the tools are used, magnetic sources need to be put into a target well, the production of a temporary well is affected, and the use of the tools is limited. Therefore, development of a passive type accurate magnetic detection anti-collision tool is needed, so that requirements of different production requirements on the passive type accurate magnetic detection anti-collision tool are met, and meanwhile, the blank of the technical industry is filled. The method is widely used for inquiring the middle experimental problem of the research and development effect of the underground magnetic detection type anti-collision tool, and the following similar technology exists at present: Firstly, the research on cluster well anti-collision technology aims at gradually forming a three-dimensional development well pattern along with the development of Fuling shale gas fields, and the anti-collision analysis of a main body area is more important in drilling construction in a complex space encrypted between an upper layer and a lower layer. 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 in adjacent well detection and simulation research based on the ground penetrating radar technology, 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. Thirdly, a model machine of the magnetic ranging anti-collision system while drilling, which has 2 functions of ranging and inclinometry, is developed by efficiently