CN-121993025-A - Anti-collision drilling method based on while-drilling magnetic detection side

CN121993025ACN 121993025 ACN121993025 ACN 121993025ACN-121993025-A

Abstract

The invention belongs to the technical field of petroleum and natural gas exploration and development, and particularly relates to an anti-collision drilling method based on a magnetic detection side while drilling. The method comprises the steps of initially determining all drilled well completion affected by construction of a well to be drilled in a construction area, setting a casing strong magnetic centralizer into all/part of the drilled well completion according to logging information storage conditions of the drilled well completion, implementing drilling construction of the well to be drilled by a drill bit provided with a magnetic detection while drilling monitoring tool, acquiring magnetic force line distribution of the casing strong magnetic centralizer based on the magnetic detection while drilling monitoring tool during the drilling construction process, further acquiring the distance between a current drilling section and an adjacent well in the well to be drilled, and determining and implementing a steering drilling anti-collision measure according to the distance between the current drilling section and the adjacent well. The technical scheme changes the current situation that the application range of the existing magnetic detection type underground anti-collision tool is narrower, makes up the blank of the existing related technology, and has the characteristic of low implementation cost compared with the prior art.

Inventors

XU CHAOYANG
LI YANWEI
GAO YONGWEI
CHEN QIAN
ZHOU WENBING
LIU LIPENG
GUO XIAOMING
WANG LEI
YANG XIANLI
WU GUANG

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. The anti-collision drilling method based on the while-drilling magnetic detection side is characterized by comprising the following steps of: s1, observing a construction area where a well to be drilled is located, and preliminarily determining all drilled well completion affected by the construction of the well to be drilled in the construction area to form an adjacent well group of the well to be drilled; S2, according to the logging information storage condition of the drilled well in the adjacent well group, casing strong magnetic centralizers are arranged in all or part of the adjacent wells in the adjacent well group; S3, after the while-drilling magnetic detection monitoring tool is installed on the drill bit, drilling construction is carried out on the well to be drilled; S4, acquiring magnetic force line distribution of the casing strong magnetic centralizer based on the while-drilling magnetic detection monitoring tool in the process of implementing drilling construction on the well to be drilled; s5, acquiring the distance between the current drilling section and the adjacent well in the well to be drilled according to the magnetic force line distribution of the sleeve ferromagnetic centralizer; S6, determining and implementing a steering drilling anti-collision measure according to the distance between the current drilling section and the adjacent well.
2. The method of claim 1, wherein in step S2, the logging-while-drilling magnetic logging-side-based anti-collision drilling method is characterized in that the logging-while-drilling magnetic logging-side-based anti-collision drilling method comprises the following steps of: S21, acquiring all well tracks of the drilled well completion in the adjacent well group according to the corresponding logging data so as to establish a space well track diagram of the adjacent well group; S22, based on the space borehole trajectory diagram of the adjacent well group, acquiring the space position of the borehole of each drilled well completion in the adjacent well group and the minimum spacing S between the adjacent well group and the well to be drilled; s23, judging whether the minimum distance S is larger than a set safety value for each drilled well completion in the adjacent well group, if not, putting a casing ferromagnetic centralizer into the corresponding drilled well completion, and if so, removing the corresponding drilled well completion from the adjacent well group.
3. The method for anti-collision drilling based on the while-drilling magnetic detection side as claimed in claim 1, wherein in the step S4, obtaining the distribution of magnetic lines of force of the casing strong magnetic centralizer comprises the following steps: S41, detecting magnetic force lines of the corresponding sleeve ferromagnetic centralizers by the while-drilling magnetic detection monitoring tool, and uploading detection data to a ground computer; s42, analyzing and obtaining the magnetic force line distribution of the sleeve ferromagnetic centralizer by the ground computer according to the received detection data, and displaying the magnetic force line distribution by a display.
4. A method of anti-collision drilling based on magnetic detection while drilling as claimed in claim 3, wherein in the step S41, the magnetic detection while drilling monitoring tool detects magnetic lines of force by regularly emitting electromagnetic waves.
5. A method of anti-collision drilling based on a magnetic while-drilling system as claimed in claim 3, wherein in step S41, the detection data is uploaded to the surface computer via a downhole MWD tool.
6. The method for preventing collision on the magnetic detection side while drilling as claimed in claim 1, wherein in the step S6, the measure of preventing collision in direction-changing drilling is divided into three steps, so that the interval between the current drilling section and the adjacent well is N; If 20m < N, no anti-collision measure is taken; if 15m < N is less than or equal to 20, adopting three-stage slow turning drilling anti-collision measures; if N is less than or equal to 15m and is less than 10m, adopting a secondary acceleration steering drilling anti-collision measure; If N is less than or equal to 10m, adopting a first-stage emergency diversion drilling anti-collision measure.
7. The anti-collision drilling method based on the magnetic detection side while drilling as claimed in claim 6, wherein the three-stage slow turning drilling anti-collision measure is to start a downhole rotary guiding tool at a wellhead so that the drilling well track of the well to be drilled is subjected to obstacle-surrounding turning at an angle of 3 degrees per 30 meters.
8. The method of claim 6, wherein the second-level acceleration diversion drilling anti-collision measure is performed by starting a downhole rotary guiding tool at the wellhead so that the drilling well track of the well to be drilled is diverted around the obstacle at an angle of 5 ° per 30 meters.
9. The method of claim 6, wherein the first-stage emergency diversion drilling anti-collision measure is to start a downhole rotary guiding tool at a wellhead so that a drilling well track of a well to be drilled is diverted around a barrier at an angle of 6 ° per 30 meters.
10. The method of anti-collision drilling based on the while-drilling magnetic search side as claimed in claim 2, wherein in the step S6, before the anti-collision measure is implemented, the method further comprises the steps of: S61, determining the well number of the adjacent well to be avoided according to the distribution of magnetic lines; S62, analyzing the track trend of the well to be avoided by combining the space well track map of the adjacent well group based on the well number; and S63, determining the direction-changing direction of direction-changing drilling according to the track trend of the well hole of the adjacent well to be avoided.

Description

Anti-collision drilling method based on while-drilling magnetic detection side Technical Field The invention belongs to the technical field of petroleum and natural gas exploration and development, and particularly relates to an anti-collision drilling method based on a magnetic detection side while drilling. 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. Shale oil is developed in recent years in multi-layer, large well cluster and three-dimensional development modes, wherein a certain 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. And 73 straight fixed wells and highly inclined wells are deployed in a certain oil extraction well region, the well head distance is 4-8m, and the anti-collision difficulty of the inclined well region 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, a company deploys a test item of a small well distance horizontal well cluster drilling and completion technology for in-situ conversion of shale oil, and the requirement on collision prevention is urgent. In the prior art, the following researches on the anti-collision technology are carried out, namely firstly, the key technology of drilling of the shale oil horizontal well in the Cangdong of oil fields of large harbor is aimed at the technical difficulties of poor adaptability of PDC drill bits, great difficulty in controlling well tracks, poor stability of shale reservoir walls and the like existing in shale oil horizontal wells in different areas, the drilling of aggressive parameters is promoted, drilling tool combinations are optimized, the personalized design of the PDC drill bits is carried out, and a drilling fluid system is optimized. Secondly, the key technology of drilling and completion of the gas reservoir in Fu county is used for carrying out research on mineral components, physicochemical properties, three-pressure profile, formation drillability and other engineering geological feature analysis of a drilling stratum, establishing a data model to conduct optimization on an actual drilling high-efficiency drill bit, determining the type of the drill bit used in each well section, analyzing the application condition of drilling parameters through software simulation, determining the aggressive drilling parameter schemes of different wells, and optimizing polyamine drilling fluid system optimization through indoor evaluation and field test to ensure stability of mudstone well walls. Thirdly, the application of the aggressive drilling technology in the development of a Changqing compact hydrocarbon reservoir is combined with a screw drilling tool and a PDC drill bit selection series which are preferably matched and suitable for acceleration and efficiency improvement of different well types, different well bores and different intervals, the theoretical understanding of the mechanical drilling speed improvement based on the maximum well bottom overflow speed and the sensitivity analysis of the drilling pressure/rotating speed to the mechanical drilling speed are developed, the large-displacement, large-drilling pressure and high-rotating speed aggressive drilling field test is performed, and the aggressive drilling parameter templates of different well types and different well intervals are established, so that the large-scale acceleration of the same area is realized. Fourthly, the Jiangsu oil field union 38 high-efficiency development technology integration is suitable for Jiangsu oil fields according to series technologies such as a well factory mode, an overall optimization design technology, a well structure optimization technology, a preferable personalized PDC drill bit, a long-service-life equal-wall-thickness screw rod, a high-pressure injection technology, a complex well track friction reduction and drag reduction, an environment-friendly starch-based drilling fluid system and the like. Fifthly, research on 'industrial' horizontal well drilling mode optimization, 'efficient PDC drill bit and high-power screw' aggressive parameter drilling technology, different offset well track control mode optimization, strong inhibition low-density CQSP-4 collapse prevention drilling fluid sectional optimization and the like is carried out in 'Sungli risk cooperation block two-open structure horizontal well drilling technology', and the superior and fast drilling technology of the Tinct gas reservoir horizontal well of the Sungli gas field is formed. The above data are mainly used for anti-collision research in the aspec