CN-121993154-A - Method and system for monitoring bending degree and tightness of sleeve column in adjacent well

CN121993154ACN 121993154 ACN121993154 ACN 121993154ACN-121993154-A

Abstract

The invention discloses a method and a system for monitoring the bending degree and the tightness of an inner sleeve column in a horizontal well of an adjacent well, and relates to the technical field of drilling and completion engineering design and construction; the method comprises the steps of (A) setting a strong magnetic centralizer in each well completion, C obtaining magnetic force line distribution conditions in each adjacent well completion vertical section by using a magnetic detection drilling tool while drilling, and calculating position data of each strong magnetic centralizer, D calculating bending degree of casing strings in each adjacent well completion vertical section, and judging sealing property of the casing strings in each adjacent well completion vertical section, E repeating step C, D, calculating bending degree of casing strings in each adjacent well completion inclined section and horizontal section, and judging sealing property of the casing strings in each adjacent well completion inclined section and horizontal section, and F comprehensively obtaining integral bending degree and integral sealing property of the casing strings in each well completion vertical section. The invention solves the technical problem that the bending degree and the tightness of the casing string are not effectively monitored.

Inventors

ZHOU WENBING
LIN ZIYAN
GAO YONGWEI
ZHAO WENZHUANG
LIU KEQIANG
ZHAO HANGBO
GUO XIAOMING
FANG DAN
YANG MIN
WANG YIFEI

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. A method of monitoring the degree of buckling and tightness of an inner casing string in a horizontal well in an adjacent well, comprising the steps of: Step A, selecting a well group, wherein the well group comprises a new well and a completed well adjacent to the new well, and establishing a well group space eye-rail diagram according to the new well and the completed well; Step B, after each well completion is completed, respectively putting a strong magnetic centralizer into each well completion through a casing string to well fix, and simultaneously preparing to drill a new well by adopting a magnetic detection drilling tool while drilling; step C, performing surface drilling on a new well, detecting magnetic force lines generated by the strong magnetic centralizers in each adjacent completed well by using a magnetic detection while drilling tool in the surface drilling process to obtain magnetic force line distribution conditions in each adjacent completed well section; Step D, the ground system superimposes the received position data on a well group space eye-rail diagram and displays the position data, meanwhile, the bending degree of the casing string in each adjacent well-completed straight well section is calculated, and the tightness of the casing string in each adjacent well-completed straight well section is judged according to the bending degree of the casing string; E, after surface layer drilling is completed, performing inclined shaft section drilling on the new well, repeating the step C, D in the inclined shaft section drilling process, calculating the bending degree of the casing string in each adjacent well-completed inclined shaft section, and judging the tightness of the casing string in each adjacent well-completed inclined shaft section according to the bending degree of the casing string; step F, after the inclined well section drilling is completed, carrying out horizontal section drilling on the new well, repeating the step C, D in the horizontal section drilling process, calculating the bending degree of the casing string in each adjacent completed horizontal section, and judging the tightness of the casing string in each adjacent completed horizontal section according to the bending degree of the casing string; And G, comprehensively obtaining the integral bending degree and the integral tightness of each adjacent well completion inner casing string according to the result of the step D, E, F.
2. A method of monitoring the extent of buckling and sealing of a casing string in an adjacent well according to claim 1, wherein in step A the well string comprises at least one new well and at least three completed wells, the new well being a well ready for drilling and the completed well being a well to be drilled or a well to be drilled.
3. A method of monitoring the extent of buckling and sealing of an inner casing string in an adjacent well as set forth in claim 1 wherein in step A, a pattern of well group space patterns is created based on the drilling and completion designs of each completed well and each new well.
4. The method of claim 1, wherein in step B, the number of the strong magnetic centralizers is a plurality of the strong magnetic centralizers, and the strong magnetic centralizers are arranged in the well completion straight section, the well completion inclined section and the well completion horizontal section respectively through casing strings.
5. A method for monitoring the bending degree and the tightness of an inner sleeve column in an adjacent well according to any one of claims 1 to 4, wherein in the step B, the connecting structure of any one of the strong magnetic centralizers and the sleeve column is a floating shoe, a sleeve, a floating hoop, a sleeve, the strong magnetic centralizer, the sleeve, a short joint and the sleeve.
6. The method of claim 1, wherein in step B, the while-drilling magnetic drilling tool comprises a PDC drill bit, a screw, a centralizer, a magnetic detection type anti-collision tool, an MWD, a drill collar, a weighted drill rod and a drill rod which are fixedly connected in sequence.
7. A system for monitoring the degree of buckling and tightness of an inner casing string in a horizontal well in an adjacent well, comprising: a drilling tool assembly for drilling a new well; the strong magnetic centralizer is respectively arranged in each well-completed vertical well section, inclined well section and horizontal section adjacent to the new well through the casing string; The magnetic detection type anti-collision tool is fixed on the drilling tool assembly and is used for detecting the magnetic force line distribution condition of the strong magnetic centralizer in each well completion when a new well is drilled, calculating the position data of the strong magnetic centralizer in each adjacent well completion straight well section, inclined well section and horizontal section according to the detected magnetic force line distribution condition, and transmitting the position data to a ground system through the drilling tool assembly; The surface system is used for building a well group space eye track diagram according to the new well and the well completion design of the well completion, is used for receiving the position data of the ferromagnetic centralizer sent by the drilling tool assembly, is used for superposing the position data of the ferromagnetic centralizer into the well group space eye track diagram and displaying the position data, is used for calculating the bending degree of the casing string in each well completion straight well section, the bending degree of the casing string in the inclined well section and the bending degree of the casing string in the horizontal section according to the position data of the ferromagnetic centralizer, and is used for judging the tightness of the casing string in each well completion according to the bending degree of the casing string.
8. The system for monitoring the bending degree and the tightness of an inner casing string in a horizontal well of an adjacent well according to claim 7, wherein the drilling tool assembly comprises a PDC drill bit, a screw, a centralizer, an MWD, a drill collar, a weighted drill rod and a drill rod which are sequentially fixed, and the magnetic detection type anti-collision tool is fixed between the centralizer and the MWD.
9. A system for monitoring the degree of buckling and tightness of a casing string in a horizontal well in an adjacent well as set forth in claim 7, wherein the drilling assembly receives position data from a magnetic probe type anti-collision tool via the MWD and transmits the position data to a surface system.
10. The system for monitoring the bending and sealing properties of an inner casing string in a horizontal well of an adjacent well of claim 7, wherein the completed wells are adjacent to the new wells and the number of new wells is at least one and the number of completed wells is at least three.

Description

Method and system for monitoring bending degree and tightness of sleeve column in adjacent well Technical Field The invention relates to the technical field of oil and gas well drilling and completion engineering design and construction, in particular to a method and a system for monitoring the bending degree and the tightness of an inner sleeve column in an adjacent well. Background In recent years, the number of shale oil gas well group development modes is increased year by year due to the enhancement of environmental protection policies, and multi-layer, large well group and three-dimensional cluster well group development modes are gradually formed, for example, 31 horizontal wells are deployed on a single platform of a Hua H100 platform, the well head distance is 8m, the well head row distance is 31m, 73 straight wells and large inclined wells are deployed on a well field of a white 409 well of an oil recovery ten-factory, and the well head distance is 4-8m. Underground oil gas energy is obtained through the cluster well group, which is beneficial to reducing the development cost of oil gas resources, so that the cluster well group is more and more widely used. In the drilling process of cluster well groups, in order to prevent a new well from colliding with a casing string of an adjacent well (which is already completed or is to be completed), and to monitor whether a sealing failure occurs in the casing string in the adjacent well, it is generally necessary to monitor the bending degree of the casing string in the adjacent well, so as to guide the drilling of the new well through the bending degree of the casing string, and ensure the sealing effect of the casing string itself in the adjacent well, so as to provide basic data for later-stage accurate oil extraction. However, there is no technology in the prior art that can well monitor the bending degree of the sleeve in the adjacent well, so it is necessary to provide a new technology to solve the foregoing technical problems. Disclosure of Invention In order to overcome the problems in the prior art, the invention provides a method and a system for monitoring the bending degree and the sealing property of the casing string in the adjacent well, which can accurately obtain the bending degree of the casing string in the adjacent well by monitoring in the new drilling process, can provide real-time anti-collision guidance for the drilling of the new well by the obtained bending degree of the casing string, can monitor whether the sealing of the casing string in the adjacent well fails or not, solve the technical problem that the bending degree of the casing string is not effectively monitored in the prior art, and provide technical support for effective oil extraction in later period. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: In a first aspect, the invention provides a method for monitoring the bending degree and the tightness of an inner sleeve column in a horizontal well of an adjacent well, which comprises the following steps: Step A, selecting a well group, wherein the well group comprises a new well and a completed well adjacent to the new well, and establishing a well group space eye-rail diagram according to the new well and the completed well; Step B, after each well completion is completed, respectively putting a strong magnetic centralizer into each well completion through a casing string to well fix, and simultaneously preparing to drill a new well by adopting a magnetic detection drilling tool while drilling; step C, performing surface drilling on a new well, detecting magnetic force lines generated by the strong magnetic centralizers in each adjacent completed well by using a magnetic detection while drilling tool in the surface drilling process to obtain magnetic force line distribution conditions in each adjacent completed well section; Step D, the ground system superimposes the received position data on a well group space eye-rail diagram and displays the position data, meanwhile, the bending degree of the casing string in each adjacent well-completed straight well section is calculated, and the tightness of the casing string in each adjacent well-completed straight well section is judged according to the bending degree of the casing string; E, after surface layer drilling is completed, performing inclined shaft section drilling on the new well, repeating the step C, D in the inclined shaft section drilling process, calculating the bending degree of the casing string in each adjacent well-completed inclined shaft section, and judging the tightness of the casing string in each adjacent well-completed inclined shaft section according to the bending degree of the casing string; step F, after the inclined well section drilling is completed, carrying out horizontal section drilling on the new well, repeating the step C, D in the horizontal section drilling process, calculating the b