Method for accurately adjusting well center alignment of derrick

Abstract

The invention relates to the technical field of ocean engineering equipment installation, and particularly discloses a derrick well center alignment accurate adjustment method which comprises the following steps: assembling a drill floor and a derrick, measuring coordinates of a drill floor wellhead center and coordinates of a derrick well center, and calculating a transverse deviation A and a longitudinal deviation B of the derrick well center according to the coordinates; arranging a tension device at the support leg of the derrick, and connecting the support leg with the drill floor by using the tension device; a lifting device is arranged at the eccentric near end of the derrick to lift the derrick, and coordinates of the well center of the derrick and the center of the wellhead of the drill floor are monitored in real time until the transverse deviation A and the longitudinal deviation B are zero; after adjustment, proper adjusting gaskets are selected to support the transverse derrick eccentric near-end supporting foot and the longitudinal derrick eccentric near-end supporting foot, and the drill floor and the derrick are locked. The derrick is fixed through the tensioning device, the derrick is prevented from toppling in the adjusting process, the derrick is jacked through the lifting device to achieve transverse and longitudinal adjustment of the derrick core, cooperation of a large crane is not needed, and operation is easy.

Description

Technical Field

[0001] The present invention relates to the technical field of marine engineering equipment installation, and in particular to a method for accurately adjusting the alignment of a derrick and a well center. Background Art

[0002] At present, the derrick is equipped with many drilling and production equipment with high-precision installation requirements, such as top drive and top drive guide rail, finger beam, floating yoke, pipe laying machine, etc. These drilling and production equipment are installed with the derrick well center and the drilling platform wellhead center as the positioning reference. Since the derrick well center is far away from the drilling platform surface, after the derrick is installed and undocking, it is affected by the release of residual stress of structural welding in the moon pool area and drilling platform area, and there is a situation where the alignment deviation between the derrick well center and the drilling platform wellhead center exceeds the design requirement. In the existing technology, a large crane is usually used to adjust the alignment between the derrick well center and the drilling platform wellhead center, which is cumbersome and costly to operate. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: how to solve the problem in the prior art that the alignment operation between the well center of the derrick and the wellhead center of the drilling platform is complicated and costly.

[0004] In order to solve the above technical problems, the present invention provides a method for accurately adjusting the alignment of a derrick and a well center, comprising the following steps:

[0005] Assemble the drilling platform and the derrick and measure the coordinates X0Y0 of the drilling platform wellhead center and the coordinates X1Y1 of the derrick well center, and calculate the lateral deviation A and the longitudinal deviation B of the derrick well center based on the coordinates X0Y0 and X1Y1;

[0006] Arranging a tensioning device at the support leg of the derrick, and connecting the support leg and the drilling platform by using the tensioning device;

[0007] In the transverse direction, a first lifting device is provided at the eccentric proximal end of the derrick to lift the eccentric proximal end support leg of the derrick and monitor the coordinates of the derrick well center and the drilling platform wellhead center in real time until the transverse deviation A is zero;

[0008] A second lifting device is provided at the eccentric proximal end of the derrick in the longitudinal direction to lift the eccentric proximal end support leg of the longitudinal derrick and monitor the coordinates of the derrick well center and the drilling platform wellhead center in real time until the longitudinal deviation B is zero;

[0009] After the horizontal and vertical tilt adjustments of the derrick well center are completed, use appropriate adjustment shims to support the horizontal derrick eccentric proximal support legs and the vertical derrick eccentric proximal support legs, and lock the drilling floor and derrick;

[0010] Remove the tensioning device, the first lifting device, and the second lifting device.

[0011] Further preferably, the step of assembling the drilling platform and the derrick, measuring the coordinates X0Y0 of the drilling platform wellhead center and the coordinates X1Y1 of the derrick well center, and calculating the lateral deviation A and the longitudinal deviation B of the derrick well center according to the coordinates X0Y0 and X1Y1 includes:

[0012] Arrange four derrick bases on the drilling platform, and connect four legs of the derrick to the derrick bases through fasteners;

[0013] According to the lateral deviation A and the longitudinal deviation B, the four legs of the derrick are divided into a lateral derrick eccentric distal leg, a lateral derrick eccentric proximal leg, a longitudinal derrick eccentric distal leg and a longitudinal derrick eccentric proximal leg, and are connected to the corresponding derrick bases respectively.

[0014] Further preferably, the step of arranging a tensioning device at the support leg of the derrick and connecting the support leg to the drilling platform by using the tensioning device includes:

[0015] A fixed fulcrum is arranged on the support leg, and a pull weight is arranged on the drilling platform. Each support leg is provided with the pull weight on opposite sides in the transverse and longitudinal directions, and a steel wire rope is connected between the fixed fulcrum and the pull weight;

[0016] A turnbuckle tensioner is installed on the steel wire rope.

[0017] Further preferably, the step of arranging a first lifting device at the eccentric proximal end of the derrick in the lateral direction, lifting the eccentric proximal end support leg of the derrick and monitoring the coordinates of the derrick well center and the drilling platform wellhead center in real time until the lateral deviation A is zero comprises:

[0018] A first retainer plate is provided at the eccentric proximal end support leg of the transverse derrick, and the eccentric proximal end support leg of the transverse derrick and the first retainer plate are locked together by a first connecting member so that the first retainer plate is parallel to the drilling floor;

[0019] A first jacking mechanism is provided on the drilling platform, and an output end of the first jacking mechanism is connected to a first code plate;

[0020] Remove the second fastener between the eccentric proximal support leg of the transverse derrick and the transverse proximal base, loosen the first fastener between the eccentric distal support leg of the transverse derrick and the transverse distal base, and the first jacking mechanism lifts the first yard plate to move upward to lift the eccentric proximal support leg of the transverse derrick;

[0021] Adjust the basket tensioner and monitor the coordinates X0Y0 of the drilling platform wellhead center and X1Y1 of the derrick well center in real time until the lateral deviation A is reduced to zero and the first jacking mechanism stops moving.

[0022] Further preferably, the step of arranging a second lifting device at the eccentric proximal end of the derrick along the longitudinal direction, lifting the eccentric proximal end support leg of the longitudinal derrick and monitoring the coordinates of the derrick well center and the drilling platform wellhead center in real time until the longitudinal deviation B is zero comprises:

[0023] A second retainer plate is provided at the eccentric proximal end support leg of the longitudinal derrick, and the eccentric proximal end support leg of the longitudinal derrick and the second retainer plate are locked by a second connecting member so that the second retainer plate is parallel to the drilling floor;

[0024] A second jacking mechanism is provided on the drilling platform, and an output end of the second jacking mechanism is connected to a second yard plate;

[0025] Remove the fourth fastener between the eccentric proximal support leg of the longitudinal derrick and the longitudinal proximal base, loosen the third fastener between the eccentric distal support leg of the longitudinal derrick and the longitudinal distal base, and use the second jacking mechanism to lift the second yard plate and move it upward to lift the eccentric proximal support leg of the longitudinal derrick;

[0026] Adjust the basket tensioner and monitor the coordinates X0Y0 of the drilling platform wellhead center and X1Y1 of the derrick well center in real time until the longitudinal deviation B is reduced to zero and the second jacking mechanism stops moving.

[0027] Further preferably, before the first jacking mechanism and the second jacking mechanism are jacked, preliminary values of the eccentric proximal end support legs of the horizontal derrick and the eccentric proximal end support legs of the longitudinal derrick that need to be raised are calculated in advance through three-dimensional model simulation, and the jacking amounts of the first jacking mechanism and the second jacking mechanism are determined based on the preliminary values.

[0028] Further preferably, after the horizontal and vertical tilt adjustments of the derrick well center are completed, the steps of selecting suitable adjustment gaskets to support the horizontal derrick eccentric proximal support legs and the vertical derrick eccentric proximal support legs, and locking the drilling floor and the derrick include:

[0029] When the lateral deviation A is reduced to zero, the first lifting mechanism stops moving, the gap size between the eccentric proximal support leg of the transverse derrick and the transverse proximal base is measured, and a first adjusting gasket of appropriate thickness is selected and placed between the eccentric proximal support leg of the transverse derrick and the transverse proximal base.

[0030] Further preferably, after the horizontal and vertical tilt adjustments of the derrick well center are completed, the steps of selecting suitable adjustment gaskets to support the horizontal derrick eccentric proximal support legs and the vertical derrick eccentric proximal support legs, and locking the drilling platform and the derrick further include:

[0031] When the lateral deviation B is reduced to zero, the second jacking mechanism stops moving, the gap size between the eccentric proximal support leg of the longitudinal derrick and the longitudinal proximal base is measured, and a second adjustment gasket of appropriate thickness is selected and placed between the eccentric proximal support leg of the longitudinal derrick and the longitudinal proximal base.

[0032] Further preferably, after the horizontal and vertical tilt adjustments of the derrick well center are completed, the steps of selecting suitable adjustment gaskets to support the horizontal derrick eccentric proximal support legs and the vertical derrick eccentric proximal support legs, and locking the drilling platform and the derrick further include:

[0033] After adding the adjustment gasket, use the first fastener to lock the eccentric distal support leg of the transverse derrick and the transverse distal base, use the second fastener to lock the eccentric proximal support leg of the transverse derrick, the first adjustment gasket and the transverse proximal base, use the third fastener to lock the eccentric distal support leg of the longitudinal derrick and the longitudinal distal base, and use the fourth fastener to lock the eccentric proximal support leg of the longitudinal derrick, the second adjustment gasket and the longitudinal proximal base.

[0034] Further preferably, the step of removing the tensioning device, the first lifting device and the second lifting device includes:

[0035] Remove the pull code, wire rope, basket tensioner, first code plate, first jacking mechanism, second code plate and second jacking mechanism.

[0036] Compared with the prior art, the method for accurately adjusting the derrick well center alignment provided by the present invention has the following beneficial effects:

[0037] The present invention calculates the lateral deviation A and the longitudinal deviation B of the derrick well center based on the coordinates X0Y0 and X1Y1, determines that the adjustment gap between the derrick and the base needs to be adjusted, and uses a tensioning device to fix the derrick to prevent it from tipping over during the adjustment of the derrick well center. The derrick is lifted by a first lifting device to achieve lateral adjustment of the derrick well center, and the derrick is lifted by a second lifting device to achieve longitudinal adjustment of the derrick well center. After the adjustment is completed, the tensioning device, the first lifting device, and the second lifting device are removed. In this way, no large crane is required, the operation is simple, the operation is safe, and it is economical and applicable. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 The present invention provides a flow chart of a method for accurately adjusting the alignment of a derrick and a well center.

[0039] Figure 2 It is a top view of the derrick and drilling platform of the present invention.

[0040] Figure 3 It is a lateral side view of the derrick of the present invention (in an eccentric state).

[0041] Figure 4 This invention Figure 3 Enlarged schematic diagram of point C in the middle.

[0042] Figure 5 It is a lateral side view of the derrick of the present invention (in aligned state).

[0043] Figure 6 This invention Figure 5 Enlarged schematic diagram of point D in the middle.

[0044] Figure 7 It is a longitudinal side view of the derrick of the present invention (eccentric state).

[0045] Figure 8 This invention Figure 7 Enlarged schematic diagram of point E in the middle.

[0046] Figure 9 It is a longitudinal side view of the derrick of the present invention (in aligned state).

[0047] Figure 10 This invention Figure 9 Enlarged schematic diagram of point F in the middle.

[0048] Reference numerals:

[0049] 10. Drilling platform; 11. Drilling platform wellhead center; 12. Derrick base; 121. Horizontal distal base; 122. Horizontal proximal base; 123. Longitudinal distal base; 124. Longitudinal proximal base; 13. Puller; 14. First fastener; 15. Second fastener; 16. Third fastener; 17. Fourth fastener;

[0050] 20. Derrick; 21. Derrick well center; 22. Eccentric distal support leg of transverse derrick; 23. Eccentric proximal support leg of transverse derrick; 24. Fixed fulcrum; 25. Wire rope; 26. Turnbuckle tensioner; 27. First connecting piece; 28. First yard plate; 29. First jacking mechanism; 210. First adjusting gasket; 211. Eccentric distal support leg of longitudinal derrick; 212. Eccentric proximal support leg of longitudinal derrick; 213. Second connecting piece; 214. Second yard plate; 215. Second jacking mechanism; 216. Second adjusting gasket. DETAILED DESCRIPTION

[0051] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0052] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like used in the present invention to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0053] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0054] Furthermore, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0055] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0056] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0057] like Figures 1-10 As shown, the present invention provides a method for accurately adjusting the alignment of a derrick and a well center, comprising the following steps:

[0058] S1: Assemble the drilling floor 10 and the derrick 20 and measure the coordinates X0Y0 of the drilling floor wellhead center 11 and the coordinates X1Y1 of the derrick well center 21, and calculate the lateral deviation A and the longitudinal deviation B of the derrick well center 21 based on the coordinates X0Y0 and X1Y1;

[0059] S2: Arranging a tensioning device at the support leg of the derrick 20, and connecting the support leg to the drilling platform 10 by using the tensioning device;

[0060] S3: In the transverse direction, a first lifting device is provided at the eccentric proximal end of the derrick 20 to lift the eccentric proximal end support leg 23 of the derrick and monitor the coordinates of the derrick well center 21 and the drilling platform wellhead center 11 in real time until the transverse deviation A is zero;

[0061] S4: Along the longitudinal direction, a second lifting device is provided at the eccentric proximal end of the derrick 20 to lift the longitudinal derrick eccentric proximal end support leg 212 and monitor the coordinates of the derrick well center 21 and the drilling platform wellhead center 11 in real time until the longitudinal deviation B is zero;

[0062] S5: After the horizontal and vertical tilt adjustments of the derrick well center 21 are completed, suitable adjustment shims are selected to support the horizontal derrick eccentric proximal support leg 23 and the vertical derrick eccentric proximal support leg 212, and the drilling floor 10 and the derrick 20 are locked;

[0063] S6: Remove the tensioning device, the first lifting device and the second lifting device.

[0064] The purpose of this embodiment is to use simple means to achieve adjustment and alignment of the derrick well center 21 and the drilling platform wellhead center 11 (alignment refers to being located on the same straight line in the vertical direction), calculate the lateral deviation A and longitudinal deviation B of the derrick well center 21 according to the coordinates X0Y0 and X1Y1, determine the adjustment gap between the derrick and the base that needs to be adjusted, and use a tensioning device to fix the derrick 20 to prevent the derrick well center 21 from tipping over during the adjustment process. The derrick 20 is lifted by the first lifting device to achieve lateral adjustment of the derrick well center 21, and the derrick 20 is lifted by the second lifting device to achieve longitudinal adjustment of the derrick well center 21. After the adjustment is completed, the tensioning device, the first lifting device and the second lifting device are removed. This method does not require the cooperation of a large crane, is simple to operate, safe to operate, and economical and applicable. In addition, the adjustment method of the present invention can ensure the installation accuracy of the derrick 20, thereby ensuring the installation accuracy of drilling and production equipment such as the top drive and top drive guide rails, finger beams, traveling yokes, and pipe racks, so that the drilling and production equipment can operate smoothly and normally.

[0065] In some embodiments, the distance between the horizontal plane where the derrick well center 21 is located and the horizontal plane where the drilling floor 10 is located is 30-60 m.

[0066] In some embodiments, taking the horizontal coordinate as X and the vertical coordinate as Y as an example, the horizontal deviation A = |X1-X0|, and the vertical deviation B = |Y1-Y0|. During the adjustment process, the derrick 20 is lifted horizontally and vertically so that A = 0 and B = 0, thereby achieving the alignment of the drilling platform wellhead center 11 and the derrick well center 21.

[0067] In another embodiment, the values of the lateral deviation A and the longitudinal deviation B may be within a set center alignment deviation range.

[0068] For example, in step S1, the steps of assembling the drilling floor 10 and the derrick 20, measuring the coordinates X0Y0 of the drilling floor wellhead center 11 and the coordinates X1Y1 of the derrick well center 21, and calculating the lateral deviation A and the longitudinal deviation B of the derrick well center 21 according to the coordinates X0Y0 and X1Y1 include:

[0069] S11: Arrange four derrick bases 12 on the drilling platform 10, and connect four legs of the derrick 20 to the derrick bases 12 through fasteners;

[0070] S12: Based on the lateral deviation A and the longitudinal deviation B, the four legs of the derrick 20 are divided into a lateral derrick eccentric distal leg 22, a lateral derrick eccentric proximal leg 23, a longitudinal derrick eccentric distal leg 211 and a longitudinal derrick eccentric proximal leg 212, and are connected to the corresponding derrick bases 12 respectively.

[0071] For example, to prevent the derrick 20 from tipping over when adjusting the derrick well center 21, in step S2, the steps of arranging a tensioning device at the support legs of the derrick 20 and connecting the support legs to the drilling floor 10 using the tensioning device include:

[0072] S21: Arrange fixed fulcrums 24 on the supporting legs, arrange pull weights 13 on the drilling floor 10, and each supporting leg is provided with pull weights on opposite sides in the transverse and longitudinal directions, and connect a steel wire rope 25 between the fixed fulcrums 24 and the pull weights 13;

[0073] S22: Install a basket tensioner 26 on the steel wire rope 25.

[0074] In this way, even if the fasteners between the legs and the derrick base 12 are loosened, the derrick 20 will not fall over, thereby ensuring the safety of construction.

[0075] For example, in step S3, the step of disposing a first lifting device at the eccentric proximal end of the derrick 20 in the lateral direction, lifting the eccentric proximal end support leg 23 of the derrick and monitoring the coordinates of the derrick well center 21 and the drilling platform wellhead center 11 in real time until the lateral deviation A is zero includes:

[0076] S31: a first retainer plate 28 is provided on the eccentric proximal end support leg 23 of the transverse derrick, and the eccentric proximal end support leg 23 of the transverse derrick and the first retainer plate 28 are locked by a first connecting member 27 so that the first retainer plate 28 is parallel to the drilling floor 10;

[0077] S32: Installing a first jacking mechanism 29 on the drilling platform 10 and connecting an output end of the first jacking mechanism 29 to a first code plate 28;

[0078] S33: Remove the second fastener 15 between the eccentric proximal support leg 23 of the transverse derrick and the transverse proximal base 122, loosen the first fastener 14 between the eccentric distal support leg 22 of the transverse derrick and the transverse distal base 121, and the first jacking mechanism 29 lifts the first yard plate 28 to move upward to lift the eccentric proximal support leg 23 of the transverse derrick;

[0079] S34: Adjust the turnbuckle 26 and monitor the coordinates X0Y0 of the drilling platform wellhead center 11 and the coordinates X1Y1 of the derrick well center 21 in real time until the lateral deviation A is reduced to zero and the first lifting mechanism 29 stops moving.

[0080] In this way, the first lifting mechanism 29 pushes the eccentric proximal leg 23 of the horizontal derrick to lift through the first yard plate 28, so that the derrick well center 21 moves laterally toward the vertical line where the drilling platform wellhead center 11 is located, so that the lateral deviation A gradually decreases and becomes zero. By adjusting the basket tensioner 26, it can be operated quickly to improve the efficiency and accuracy of lateral alignment. Figure 5 and Figure 6 shown.

[0081] For example, in step S4, the step of disposing a second lifting device at the eccentric proximal end of the derrick 20 along the longitudinal direction, lifting the eccentric proximal end support leg 212 of the longitudinal derrick and monitoring the coordinates of the derrick well center 21 and the drilling platform wellhead center 11 in real time until the longitudinal deviation B is zero includes:

[0082] S41: Setting a second stopper plate 214 on the eccentric proximal end support leg 212 of the longitudinal derrick, and locking the eccentric proximal end support leg 212 and the second stopper plate 214 through a second connecting member 213 so that the second stopper plate 214 is parallel to the drilling floor 10;

[0083] S42: Install a second lifting mechanism 215 on the drilling platform 10, and connect the output end of the second lifting mechanism 215 to the second code plate 214;

[0084] S43: Remove the fourth fastener 17 between the eccentric proximal support leg 212 of the longitudinal derrick and the longitudinal proximal base 124, loosen the third fastener 16 between the eccentric distal support leg 211 of the longitudinal derrick and the longitudinal distal base 123, and the second jacking mechanism 215 lifts the second yard plate 214 to move upward to lift the eccentric proximal support leg 212 of the longitudinal derrick;

[0085] S44: Adjust the turnbuckle 26 and monitor the coordinates X0Y0 of the drilling platform wellhead center 11 and the coordinates X1Y1 of the derrick well center 21 in real time until the longitudinal deviation B is reduced to zero and the second lifting mechanism 215 stops moving.

[0086] In this way, the second lifting mechanism 215 pushes the eccentric proximal support leg 212 of the longitudinal derrick to rise through the second yard plate 214, so that the derrick well center 21 moves longitudinally toward the vertical line where the wellhead center 11 of the drilling platform is located, so that the longitudinal deviation B gradually decreases and becomes zero. By adjusting the basket tensioner 26, it can be operated quickly to improve the longitudinal alignment efficiency and accuracy. Figure 9 and Figure 10 shown.

[0087] In some embodiments, the first jacking mechanism 29 and the second jacking mechanism 215 are both jacks, and during the jacking process, there are at least two first jacking mechanisms 29 to ensure the balance and stability of the first code plate 28. Similarly, there are at least two second jacking mechanisms 215 to ensure the balance and stability of the second code plate 214.

[0088] For example, before the first jacking mechanism 29 and the second jacking mechanism 215 are jacked, preliminary values of the eccentric proximal end support 23 of the horizontal derrick and the eccentric proximal end support 212 of the longitudinal derrick required to be raised are calculated in advance through three-dimensional model simulation, and the jacking amounts of the first jacking mechanism 29 and the second jacking mechanism 215 are determined based on the preliminary values to ensure the accuracy and efficiency of the adjustment.

[0089] For example, in step S5, after the lateral and longitudinal tilt adjustments of the derrick well center 21 are completed, the steps of selecting suitable adjustment shims to support the lateral derrick eccentric proximal support legs 23 and the longitudinal derrick eccentric proximal support legs 212, and locking the drilling floor 10 and the derrick 20 include:

[0090] S51: When the lateral deviation A is reduced to zero, the first lifting mechanism 29 stops moving, and the gap between the eccentric proximal support leg 23 of the transverse derrick and the transverse proximal base 122 is measured. A first adjusting gasket 210 of appropriate thickness is selected and placed between the eccentric proximal support leg 23 of the transverse derrick and the transverse proximal base 122;

[0091] S52: When the lateral deviation B is reduced to zero, the second lifting mechanism 215 stops moving, and the gap between the eccentric proximal support leg 212 of the longitudinal derrick and the longitudinal proximal base 124 is measured. A second adjusting gasket 216 of appropriate thickness is selected and placed between the eccentric proximal support leg 212 of the longitudinal derrick and the longitudinal proximal base 124;

[0092] S53: After adding the adjustment gasket, use the first fastener 14 to lock the eccentric distal support leg 22 of the transverse derrick and the transverse distal base 121, use the second fastener 15 to lock the eccentric proximal support leg 23 of the transverse derrick, the first adjustment gasket 210 and the transverse proximal base 122, use the third fastener 16 to lock the eccentric distal support leg 211 of the longitudinal derrick and the longitudinal distal base 123, and use the fourth fastener 17 to lock the eccentric proximal support leg 212 of the longitudinal derrick, the second adjustment gasket 216 and the longitudinal proximal base 124.

[0093] Therefore, after the derrick 20 is lifted horizontally and vertically, the lifting gap needs to be filled with adjusting gaskets to ensure the balance and stability of the connection between the derrick 20 and the drilling floor 10 after the tensioning device, the first lifting device and the second lifting device are removed.

[0094] Exemplarily, in step S6, the step of removing the tensioning device, the first lifting device, and the second lifting device includes:

[0095] S61: Remove the pull code 13, the steel wire rope 25, the flower basket tensioner 26, the first code plate 28, the first lifting mechanism 29, the second code plate 214 and the second lifting mechanism 215.

[0096] In some embodiments, the removed portion needs to be polished to avoid cutting equipment, instruments, or personnel.

[0097] In summary, an embodiment of the present invention provides a method for precise adjustment of the derrick well center, which calculates the lateral deviation A and longitudinal deviation B of the derrick well center 21 according to the coordinates X0Y0 and X1Y1, determines that the adjustment gap between the derrick and the base needs to be adjusted, and uses a tensioning device to fix the derrick 20 to prevent the derrick well center 21 from tipping over during the adjustment process. The derrick 20 is lifted by a first lifting device to achieve lateral adjustment of the derrick well center 21, and the derrick 20 is lifted by a second lifting device to achieve longitudinal adjustment of the derrick well center 21. After the adjustment is completed, the tensioning device, the first lifting device and the second lifting device are removed. Therefore, there is no need for a large crane, and the operation is simple, safe, and economical.

[0098] The above description is only a preferred embodiment of the present invention. It should be noted that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be considered as the scope of protection of the present invention. The basic principles, main features and advantages of the present invention are shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above preferred embodiments. The examples should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0099] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A method for accurately adjusting the alignment of a derrick and a well center, characterized in that: The following steps are involved: Assemble the drilling platform and the derrick and measure the coordinates X0Y0 of the drilling platform wellhead center and the coordinates X1Y1 of the derrick well center, and calculate the lateral deviation A and the longitudinal deviation B of the derrick well center based on the coordinates X0Y0 and X1Y1; Arranging a tensioning device at the support leg of the derrick, and connecting the support leg and the drilling platform by using the tensioning device; In the transverse direction, a first lifting device is provided at the eccentric proximal end of the derrick to lift the eccentric proximal end support leg of the derrick and monitor the coordinates of the derrick well center and the drilling platform wellhead center in real time until the transverse deviation A is zero; A second lifting device is provided at the eccentric proximal end of the derrick in the longitudinal direction to lift the eccentric proximal end support leg of the longitudinal derrick and monitor the coordinates of the derrick well center and the drilling platform wellhead center in real time until the longitudinal deviation B is zero; After the horizontal and vertical tilt adjustments of the derrick well center are completed, use appropriate adjustment shims to support the horizontal derrick eccentric proximal support legs and the vertical derrick eccentric proximal support legs, and lock the drilling floor and derrick; Remove the tensioning device, the first lifting device, and the second lifting device.

2. A method for accurately adjusting the well center alignment of a derrick according to claim 1, characterized in that: The steps of assembling the drilling platform and the derrick, measuring the coordinates X0Y0 of the drilling platform wellhead center and the coordinates X1Y1 of the derrick well center, and calculating the lateral deviation A and the longitudinal deviation B of the derrick well center according to the coordinates X0Y0 and X1Y1 include: Arrange four derrick bases on the drilling platform, and connect four legs of the derrick to the derrick bases through fasteners; According to the lateral deviation A and the longitudinal deviation B, the four legs of the derrick are divided into a lateral derrick eccentric distal leg, a lateral derrick eccentric proximal leg, a longitudinal derrick eccentric distal leg and a longitudinal derrick eccentric proximal leg, and are connected to the corresponding derrick bases respectively.

3. The method for accurately adjusting the well center alignment of a derrick according to claim 2, characterized in that: The steps of arranging a tensioning device at the support leg of the derrick and connecting the support leg to the drilling platform by using the tensioning device include: A fixed fulcrum is arranged on the support leg, and a pull weight is arranged on the drilling platform. Each support leg is provided with the pull weight on opposite sides in the transverse and longitudinal directions, and a steel wire rope is connected between the fixed fulcrum and the pull weight; A turnbuckle tensioner is installed on the steel wire rope.

4. A method for accurately adjusting the derrick well center position according to claim 3, characterized in that: The step of disposing a first lifting device at the eccentric proximal end of the derrick in the transverse direction, lifting the eccentric proximal end support leg of the derrick and monitoring the coordinates of the derrick well center and the drilling platform wellhead center in real time until the lateral deviation A is zero comprises: A first stopper is provided at the eccentric proximal end support leg of the transverse derrick, and the eccentric proximal end support leg of the transverse derrick and the first stopper are locked together by a first connecting member so that the first stopper is parallel to the drilling floor; A first jacking mechanism is provided on the drilling platform, and an output end of the first jacking mechanism is connected to a first code plate; Remove the second fastener between the eccentric proximal support leg of the transverse derrick and the transverse proximal base, loosen the first fastener between the eccentric distal support leg of the transverse derrick and the transverse distal base, and the first jacking mechanism lifts the first yard plate to move upward to lift the eccentric proximal support leg of the transverse derrick; Adjust the basket tensioner and monitor the coordinates X0Y0 of the drilling platform wellhead center and X1Y1 of the derrick well center in real time until the lateral deviation A is reduced to zero and the first jacking mechanism stops moving.

5. The method for accurately adjusting the derrick well center position according to claim 4 is characterized in that: The step of arranging a second lifting device at the eccentric proximal end of the derrick along the longitudinal direction, lifting the eccentric proximal end support leg of the longitudinal derrick and monitoring the coordinates of the derrick well center and the drilling platform wellhead center in real time until the longitudinal deviation B is zero includes: A second stopper is provided at the eccentric proximal end support leg of the longitudinal derrick, and the eccentric proximal end support leg of the longitudinal derrick and the second stopper are locked together by a second connecting member so that the second stopper is parallel to the drilling floor; A second jacking mechanism is provided on the drilling platform, and an output end of the second jacking mechanism is connected to a second yard plate; Remove the fourth fastener between the eccentric proximal support leg of the longitudinal derrick and the longitudinal proximal base, loosen the third fastener between the eccentric distal support leg of the longitudinal derrick and the longitudinal distal base, and use the second jacking mechanism to lift the second yard plate and move it upward to lift the eccentric proximal support leg of the longitudinal derrick; Adjust the basket tensioner and monitor the coordinates X0Y0 of the drilling platform wellhead center and X1Y1 of the derrick well center in real time until the longitudinal deviation B is reduced to zero and the second jacking mechanism stops moving.

6. A method for precise adjustment of derrick well center alignment according to claim 5, characterized in that: Before the first and second jacking mechanisms are lifted, preliminary values of the eccentric proximal end support legs of the horizontal and longitudinal derricks that need to be lifted are calculated in advance through three-dimensional model simulation, and the lifting amounts of the first and second jacking mechanisms are determined based on the preliminary values.

7. A method for accurately adjusting the derrick well center position according to claim 6, characterized in that: After the horizontal and vertical tilt adjustments of the derrick well center are completed, the steps of selecting suitable adjustment gaskets to support the horizontal derrick eccentric proximal support legs and the vertical derrick eccentric proximal support legs, and locking the drilling platform and the derrick include: When the lateral deviation A is reduced to zero, the first lifting mechanism stops moving, the gap size between the eccentric proximal support leg of the transverse derrick and the transverse proximal base is measured, and a first adjusting gasket of appropriate thickness is selected and placed between the eccentric proximal support leg of the transverse derrick and the transverse proximal base.

8. The method for accurately adjusting the derrick well center position according to claim 7, characterized in that: After the horizontal and vertical tilt adjustments of the derrick well center are completed, the steps of selecting appropriate adjustment gaskets to support the horizontal derrick eccentric proximal support legs and the vertical derrick eccentric proximal support legs, and locking the drilling platform and the derrick further include: When the lateral deviation B is reduced to zero, the second jacking mechanism stops moving, the gap size between the eccentric proximal support leg of the longitudinal derrick and the longitudinal proximal base is measured, and a second adjustment gasket of appropriate thickness is selected and placed between the eccentric proximal support leg of the longitudinal derrick and the longitudinal proximal base.

9. The method for accurately adjusting the well center alignment of a derrick according to claim 8, characterized in that: After the horizontal and vertical tilt adjustments of the derrick well center are completed, the steps of selecting appropriate adjustment gaskets to support the horizontal derrick eccentric proximal support legs and the vertical derrick eccentric proximal support legs, and locking the drilling platform and the derrick further include: After adding the adjustment gasket, use the first fastener to lock the eccentric distal support leg of the transverse derrick and the transverse distal base, use the second fastener to lock the eccentric proximal support leg of the transverse derrick, the first adjustment gasket and the transverse proximal base, use the third fastener to lock the eccentric distal support leg of the longitudinal derrick and the longitudinal distal base, and use the fourth fastener to lock the eccentric proximal support leg of the longitudinal derrick, the second adjustment gasket and the longitudinal proximal base.

10. A method for precise adjustment of derrick well center alignment according to claim 9, characterized in that: The steps of removing the tensioning device, the first lifting device and the second lifting device to complete the adjustment include: Remove the pull code, wire rope, basket tensioner, first code plate, first jacking mechanism, second code plate and second jacking mechanism.

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