A method for adjusting the relative position between the inclined plane of a whipstock and a guide cone

Abstract

The present invention discloses a method for adjusting the relative position between the inclined plane of the whipstock and the guiding cone. The present invention realizes quickly and accurately determining the relative position between the inclined plane for creating a wellbore and the guiding cone, guiding the position adjustment of the whipstock matrix and the guiding cone, ensuring the safety of on-site operators and realizing the accurate lowering of the riser into the whipstock.

Description

Technical Field

[0001] The invention belongs to the field of oil drilling technology and methods, and in particular relates to a method for adjusting the relative position of a whipstock inclined surface and a guide cone. Background Art

[0002] Before the whipstock is lowered during the riser re-entry operation in offshore oilfields, for the cut multi-layer casing (the casing may have two, three, four layers of different sizes), the eccentric direction of the innermost casing of the cut multi-layer casing under the formation is unknown, and the whipstock guide cone needs to be accurately inserted into the innermost casing of the original wellbore, and ensure that the whipstock bevel surface can meet the drilling angle and orientation designed by the engineering. This requires that the guide cone and the bevel surface can be relatively rotated and adjusted to meet the requirements that the whipstock can be inserted into the original wellbore and fixed, and the bevel surface can be adjusted at any angle. Directional drilling requires on-site surveying and mapping of the relative position of the innermost casing of the cutting section within the outermost waterproof casing (i.e., the deviation of the center of the two circles with different centers), and the installation of the whipstock guide cone according to the measured relative position. The relative position of the whipstock bevel surface and the guide cone is adjusted by calculating the adjustment angle. After the installation is completed, the relative rotation angle of the whipstock and the guide cone is calculated according to the drilling direction and angle requirements formulated in the engineering design, so that the drill bit can reach an inclination angle of 3.5°-5° when it passes through the whipstock's own bevel surface and exits the whipstock tool. The original method for adjusting the whipstock guide cone was to divide the multi-layer casing into sections on the drilling floor after it was pulled out of the original wellbore. When measuring the eccentric position of the innermost casing, the operator needed to use a ruler and a marker to mark the cut surface of the multi-layer casing, measure the arc length corresponding to the eccentric angle, and calculate the casing eccentric angle. Since the watertight pipe is cut into sections on the drilling floor during on-site operations, there is a risk of falling objects from a high altitude during on-site measurements. The measurement space for personnel at the bottom is limited, the measurement time is long, and any slight deviation in the measurement result requires repeated measurement, which greatly reduces the efficiency of on-site operations. Summary of the Invention

[0003] The object of the present invention is to overcome the deficiencies of the prior art and to provide a method for adjusting the relative position of a whipstock inclined surface and a guide cone.

[0004] The present invention is achieved through the following technical solutions:

[0005] A method for adjusting the relative position of a whipstock inclined surface and a guide cone comprises the following steps:

[0006] S1: Pre-mark the bevel position on the rubbing paper;

[0007] S2: Apply paint to the innermost and outermost casings on the cut end surface of the casing;

[0008] S3: Align the pre-marked bevel position with the actual sidetracking position of the drilling design using the rubbing paper, and make the rubbing paper coincide with the cut end face of the casing.

[0009] S4: Select the corresponding wedge block and guide cone for installing the whipstock according to the relative positions of the inner casing and the outer casing after rubbing with the rubbing paper.

[0010] S5: Weld and fix the wedge block and guide cone of the whipstock to the whipstock base body.

[0011] S6: Use scissors to cut off the inner hole of the innermost casing on the rubbing paper after rubbing, and remove the outer corners of the outermost casing on the rubbing paper.

[0012] S7: Place the colored surface of the rubbing paper against the lower end face of the whipstock base body, insert the inner hole of the rubbing paper into the guide cone of the whipstock, and rotate the rubbing paper to make the outer circular surface of the rubbing paper coincide with the outer circular surface of the base body.

[0013] S8: Rotate the whipstock base body to make the bevel surface of the whipstock coincide with the main viewing direction of the marked bevel surface on the rubbing paper, and the angle adjustment of the whipstock can be completed.

[0014] S9: Weld the whipstock base body and the whipstock guide pipe body so that the whipstock base body and the whipstock guide pipe cannot rotate.

[0015] The beneficial effects of the present invention are:

[0016] The present invention realizes the rapid and accurate determination of the relative positions of the bevel surface and the guide cone, guides the position adjustment of the whipstock base body and the guide cone, ensures the safety of on-site operators, and realizes the accurate lowering of the riser re-entry whipstock. Description of the Drawings

[0017] Figure 1 It is a flowchart of a method for adjusting the relative positions of the bevel surface and the guide cone of a whipstock provided by an embodiment of the present invention;

[0018] Figure 2 It is a schematic diagram of the rubbing paper of the present invention;

[0019] Figure 3 It is a schematic diagram after rubbing of the present invention;

[0020] Figure 4 It is a schematic diagram of the shearing of the rubbing paper of the present invention;

[0021] Figure 5 It is a schematic diagram of the assembly of the guide cone of the present invention;

[0022] Figure 6 It is a schematic diagram after the assembly of the guide cone of the present invention;

[0023] Figure 7Schematic diagram of adjusting the relative positions of the build-up surface of the whipstock and the guide cone according to the present invention;

[0024] Figure 8 Schematic diagram after the relative positions of the build-up surface and the guide cone of the present invention are adjusted;

[0025] In the figure: 1 is the position of the build-up surface, 2 is the outermost layer of the casing, 3 is the mark of the innermost layer of the casing, 4 is the redundant part of the inner casing, 5 is the redundant part of the outer casing, 6 is the build-up surface of the whipstock, 7 is the guide cone, and 8 is the whipstock matrix.

[0026] For those of ordinary skill in the art, other relevant drawings can be obtained based on the above drawings without creative efforts. Detailed implementation manners

[0027] The technical solution of the present invention will be further described below in conjunction with specific embodiments.

[0028] Embodiment

[0029] A method for adjusting the relative positions of the whipstock inclined surface and the guide cone includes the following steps:

[0030] S1: Mark the position of the build-up surface on the tracing paper in advance;

[0031] S2: Apply paint to the innermost layer and the outermost layer of the casing cut end face;

[0032] S3: Align the position of the pre-marked build-up surface on the tracing paper with the actual sidetracking position of the drilling design, and make the tracing paper coincide with the casing cut end face;

[0033] S4: Select the corresponding wedge block and guide cone for installing the whipstock according to the relative positions of the inner casing and the outer casing after the tracing paper is traced;

[0034] S5: Weld and fix the whipstock wedge block and guide cone on the whipstock matrix;

[0035] S6: Use scissors to cut off the inner hole of the innermost layer of the casing on the tracing paper after tracing, and remove the outer corners of the outermost layer of the casing on the tracing paper;

[0036] S7: Face the painted surface of the tracing paper with the lower end face of the whipstock matrix, put the inner hole of the tracing paper into the guide cone of the whipstock, and rotate the tracing paper to make the outer circular surface of the tracing paper coincide with the outer circular surface of the matrix;

[0037] S8: Rotate the whipstock matrix to make the build-up surface of the whipstock coincide with the main viewing direction of the marked build-up surface on the tracing paper, and the angle adjustment of the whipstock can be completed;

[0038] S9: Weld the whipstock matrix and the whipstock conduit body so that the whipstock matrix and the whipstock conduit cannot rotate.

[0039] The above makes an exemplary description of the present invention. It should be noted that without departing from the core of the present invention, any simple deformation, modification or equivalent replacement that can be made by those skilled in the art without creative labor falls within the protection scope of the present invention.

Claims

1. A method for adjusting the relative position between the inclined plane of a whipstock and a guide cone, characterized in that The steps include: S1: Pre-mark the bevel-making position on the rubbing paper; S2: Apply paint at the innermost and outermost sleeves of the cut end face of the casing; S3: Overlap and align the pre-marked bevel-making position with the actual sidetracking position of the drilling design using the rubbing paper, and overlap the rubbing paper with the cut end face of the casing; S4: Select the corresponding wedge block and guide cone of the whipstock according to the relative positions of the inner sleeve and the outer sleeve after rubbing with the rubbing paper; S5: Weld and fix the wedge block and guide cone of the whipstock to the whipstock matrix; S6: Use scissors to cut off the inner hole of the innermost sleeve on the rubbing paper after rubbing, and remove the outer corners of the outermost sleeve on the rubbing paper; S7: Align the painted surface of the rubbing paper with the lower end face of the whipstock matrix, insert the inner hole of the rubbing paper into the guide cone of the whipstock, and rotate the rubbing paper to make the outer circular surface of the rubbing paper coincide with the outer circular surface of the matrix; S8: Rotate the whipstock matrix to make the bevel of the whipstock coincide with the main view direction of the marked bevel on the rubbing paper, and the angle adjustment of the whipstock can be completed; S9: Weld the whipstock matrix and the whipstock guide pipe body so that the whipstock matrix and the whipstock guide pipe cannot rotate.

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