CN-122014113-A - Sleeve combination recommending method based on passing verification

CN122014113ACN 122014113 ACN122014113 ACN 122014113ACN-122014113-A

Abstract

The application relates to the technical field of petroleum engineering, and discloses a sleeve combination recommending method based on passing verification, which comprises the following steps: constructing a virtual well, a general discrimination formula, an influence characteristic, a correction discrimination formula and a comprehensive analysis model, and operating the comprehensive analysis model to recommend a whipstock or a casing combination. According to the application, the virtual well is constructed to represent the geometrical characteristics of the real well, the general discrimination formula is obtained to judge the passing performance of the casing combination, the characteristics of the whipstock influencing the geometrical characteristics of the virtual well are combined to obtain the corrected discrimination formula, the comprehensive analysis model is constructed based on the corrected discrimination formula, and the whipstock recommendation or the casing combination recommendation is finally realized, so that a more scientific and accurate casing combination and whipstock selection scheme are provided for reuse of old well slots, and the well utilization rate and quality are improved.

Inventors

GUO XUE
An Mengwen
CHEN FULU
TIAN DEHAO
GUO JIAWEI
REN XIANKE
Xi Zishan
ZHANG XU
ZHANG QIANG
LI WEI
YUAN RUIXIA
DONG TAIJI
CAO MENGYU
ZHANG XINHUA

Assignees

东北石油大学

Dates

Publication Date: 20260512
Application Date: 20251203

Claims (10)

1. A method of sleeve combination recommendation based on pass verification, comprising: s1, constructing a virtual borehole, wherein the virtual borehole is used for representing the geometrical characteristics of a real borehole; S2, acquiring a general discrimination formula, wherein the general discrimination formula is used for judging the trafficability of the sleeve combination; S3, obtaining influence characteristics, wherein the influence characteristics are characteristics of influence on the geometric characteristics of the virtual well bore when a whipstock is used for carrying out old well slot weight; s4, acquiring a correction discrimination formula, wherein the correction discrimination formula is used for judging the passing performance of the sleeve combination when the whipstock is used, and the correction discrimination formula is obtained by correcting the general discrimination formula by utilizing the influence characteristics; S5, acquiring a comprehensive analysis model, wherein the comprehensive analysis model is used for recommending a whipstock or recommending a sleeve combination, and the comprehensive analysis model is constructed based on the correction discrimination formula; And S6, operating the comprehensive analysis model to recommend a whipstock or a sleeve combination.
2. The method for recommending casing combinations based on the passing verification according to claim 1, the method is characterized in that the virtual well bore comprises the following steps: establishing a plane rectangular coordinate system by taking the vertex of the whipstock as a coordinate origin O; Constructing concentric circles with the radius of R 1 and R 2 in the space, wherein the coordinate with the center point of O t is (x, y); In the inner area of the new riser, only a circle R 1 of a point C and a part below the point C, a circle R 2 and a side drilling well hole are considered to form a virtual well hole for a casing pipe to pass through, wherein the circle R 1 is a circle tangential to a well wall and a whipstock, the circle R 2 is a circle concentric with the circle R 1 and passing through a fixed point A on the directional window, the point M is a tangent point of the circle R 1 and the whipstock, the distance from the x axis is n, and the point C is a tangent point of the circle R 1 and the vertical well wall.
3. The sleeve combination recommendation method based on the passing verification according to claim 2, wherein the calculation formulas of the radii R 1 and R 2 corresponding to the circle R 1 and the circle R 2 are specifically: Setting a lower windowing point B, wherein the distance between the B and the bottom edge of the whipstock is L B ; Wherein R 1 passes the radius of the circle of the B point cut vertical well wall and the slant of the slant machine and is in m, R 2 is the radius of the circle concentric with R 1 passing the A point and is in m, theta Oblique angle is the slant machine inclination angle and is in rad, theta Window is the windowing angle and is in rad, D is the well diameter and is in m, L Window is the windowing diameter and is in m, and L B is the distance from the bottom edge of the slant machine to the lower windowing point B and is in m.
4. The method for recommending a sleeve combination based on the passing verification according to claim 1, wherein the general discrimination formula is specifically: d Cover max ＜min(L Window ·sinθ Window ,d Cover 1 ) Wherein d Cover max is the maximum value unit of the sleeve combination diameter, min is the minimum value symbol, L Window is the windowing diameter and unit is m, θ Window is the windowing angle and unit is rad, and d Cover 1 is the calculated sleeve combination diameter and unit is m.
5. The method for recommending a sleeve combination based on the passing verification according to claim 4, wherein the calculation formula of the sleeve combination diameter d Cover 1 is specifically as follows: Wherein q is an evenly distributed load acting on a lateral force and is in N/m, L is a casing length and is in m, R is a borehole radius of curvature and r=0.5 x (R 1 +R 2 ) and is in m, D is a borehole diameter and is in m, EI is a drilling tool stiffness and is in kg/m3, K n 、K m 、K q is a preset parameter, and m 0 is a bending moment received and is in n·m.
6. A sleeve combination recommendation method based on a pass verification according to claim 3, characterized in that said influencing features are in particular: When using a whipstock, the calculated update of the radii R 1 and R 2 corresponding to the circle R 1 and the circle R 2 results in: The updated result is used to correct the general discrimination formula.
7. The method of claim 5, wherein the process of obtaining the revised discrimination equations comprises: The maximum value of the allowed-through sleeve combination diameter d Cover max is smaller than the smaller value of the window diameter of the sidetrack fenestration and the inside diameter of the whipstock, namely: d Cover max ＜min(L Window ·sinθ Window ,d Oblique angle ) wherein d Oblique angle is the inner diameter of the whipstock and the unit is m.
8. The method of claim 7, wherein the process of obtaining the revised discrimination equations further comprises: and correcting the general discrimination formula by utilizing the influence characteristics to obtain a corrected discrimination formula, wherein the corrected discrimination formula is as follows: d Cover max ＝d Coupling ＜min(L Window ·sinθ Window ,d Oblique angle ,d Cover 1 ) wherein d Coupling passes through the diameter of the collar of the casing assembly of the wellbore and has the unit m.
9. The sleeve combination recommendation method based on the passing verification according to claim 1, wherein the process of recommending by the comprehensive analysis model into the whipstock is as follows: the available whipstock parameters are recommended based on known string dead weight, run-in casing diameter, sidetrack fenestration window diameter and window angle.
10. The method for recommending the sleeve combination based on the passing verification according to claim 1, wherein the process of recommending the sleeve combination by the comprehensive analysis model is as follows: the available whipstock parameters are recommended based on known string dead weight, run-in casing diameter, sidetrack fenestration window diameter and window angle.

Description

Sleeve combination recommending method based on passing verification Technical Field The application relates to the technical field of petroleum engineering, in particular to a sleeve combination recommending method based on passing verification. Background In the reuse of old well slots in petroleum operations, reasonable selection of whipstock and optimization of casing combinations are of paramount importance. However, the inventors found the following problems in recommending existing whipstock or casing combination recommendation methods: 1. when judging the trafficability of the casing combination, the lack of an accurate and effective general discrimination formula is difficult to comprehensively characterize the geometric characteristics of a real well bore, so that the adaptability of the casing combination in different well bores cannot be accurately estimated; 2. When the whipstock is used for reusing the old well slot, the influence on the geometrical characteristics of the well bore is not fully considered, so that the recommended whipstock and casing combination can be mismatched in practical application, and the utilization rate and safety of the well bore are affected. 3. The existing recommendation method is single, lacks a comprehensive analysis model, cannot consider multiple factors of combination of the whipstock and the sleeve at the same time, and cannot provide an optimal solution for reuse of the old well slot In summary, a new technical solution recommended by a casing combination based on passing verification is needed to improve the efficiency and quality of old well reuse. Disclosure of Invention The application aims to provide a sleeve combination recommending method based on passing verification, which aims to solve the technical problems in the background technology. In order to achieve the purpose, the application discloses a sleeve combination recommending method based on passing verification, which comprises the following steps: s1, constructing a virtual borehole, wherein the virtual borehole is used for representing the geometrical characteristics of a real borehole; S2, acquiring a general discrimination formula, wherein the general discrimination formula is used for judging the trafficability of the sleeve combination; S3, obtaining influence characteristics, wherein the influence characteristics are characteristics of influence on the geometric characteristics of the virtual well bore when a whipstock is used for carrying out old well slot weight; s4, acquiring a correction discrimination formula, wherein the correction discrimination formula is used for judging the passing performance of the sleeve combination when the whipstock is used, and the correction discrimination formula is obtained by correcting the general discrimination formula by utilizing the influence characteristics; S5, acquiring a comprehensive analysis model, wherein the comprehensive analysis model is used for recommending a whipstock or recommending a sleeve combination, and the comprehensive analysis model is constructed based on the correction discrimination formula; And S6, operating the comprehensive analysis model to recommend a whipstock or a sleeve combination. Preferably, the virtual wellbore is specifically: establishing a plane rectangular coordinate system by taking the vertex of the whipstock as a coordinate origin O; Constructing concentric circles with the radius of R 1 and R 2 in the space, wherein the coordinate with the center point of O t is (x, y); In the inner area of the new riser, only a circle R 1 of a point C and a part below the point C, a circle R 2 and a side drilling well hole are considered to form a virtual well hole for a casing pipe to pass through, wherein the circle R 1 is a circle tangential to a well wall and a whipstock, the circle R 2 is a circle concentric with the circle R 1 and passing through a fixed point A on the directional window, the point M is a tangent point of the circle R 1 and the whipstock, the distance from the x axis is n, and the point C is a tangent point of the circle R 1 and the vertical well wall. Preferably, the calculation formulas of the radii R 1 and R 2 corresponding to the circles R 1 and R 2 are specifically as follows: Setting a lower windowing point B, wherein the distance between the B and the bottom edge of the whipstock is L B; Wherein R 1 passes the radius of the circle of the B point cut vertical well wall and the slant of the slant machine and is in m, R 2 is the radius of the circle concentric with R 1 passing the A point and is in m, theta Oblique angle is the slant machine inclination angle and is in rad, theta Window is the windowing angle and is in rad, D is the well diameter and is in m, L Window is the windowing diameter and is in m, and L B is the distance from the bottom edge of the slant machine to the lower windowing point B and is in m. Preferably, the general discrimination formula specifically includes: