A method for accurately adjusting the centering of a derrick mast

Abstract

The present application relates to the technical field of offshore engineering equipment installation, and discloses a well derrick well center alignment accurate adjustment method, which comprises the following steps: assembling a drilling floor and a well derrick, measuring the coordinates of the well center of the drilling floor and the coordinates of the well center of the well derrick, calculating the lateral deviation A and the longitudinal deviation B of the well center of the well derrick according to the coordinates; arranging a tensioning device at the foot of the well derrick, connecting the foot and the drilling floor by the tensioning device; setting a lifting device at the eccentric proximal end of the well derrick to lift the well derrick, and monitoring the coordinates of the well center of the well derrick and the well center of the drilling floor in real time until the lateral deviation A and the longitudinal deviation B are zero; selecting appropriate adjustment shims to support the lateral well derrick eccentric proximal end foot and the longitudinal well derrick eccentric proximal end foot after adjustment, and locking the drilling floor and the well derrick. The present application fixes the well derrick by the tensioning device to prevent the well derrick from toppling during adjustment, and adjusts the lateral and longitudinal well center of the well derrick by the lifting device, so that a large crane is not needed, and the operation is simple.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of offshore engineering equipment installation, in particular to a well center alignment accurate adjustment method. BACKGROUND

[0002] Currently, the top drive and top drive guide rail, finger beam, movable yoke, pipe rack and other high-precision installation requirements of drilling and production equipment are installed on the well center, and the drilling and production equipment is installed on the well center and the well center of the drilling platform as the positioning reference. Since the well center is far away from the drilling platform, after the well center is installed and launched, the well center is affected by the release of the welding residual stress of the moon pool area and the drilling platform area structure, and the well center and the well center of the drilling platform are deviated from the design requirements. In the prior art, a large crane is usually used to adjust the well center and the well center of the drilling platform, which is troublesome and high in cost. SUMMARY

[0003] The technical problem to be solved by the present application is how to solve the problem of the prior art that the well center and the well center of the drilling platform are deviated from the design requirements.

[0004] In order to solve the above technical problems, the present application provides a well center alignment accurate adjustment method, comprising the following steps:

[0005] Assembling the drilling platform and the well center and measuring the coordinates X0Y0 of the well center of the drilling platform and the coordinates X1Y1 of the well center of the well center, calculating the lateral deviation A and the longitudinal deviation B of the well center of the well center according to the coordinates X0Y0 and X1Y1;

[0006] A tensioning device is arranged at the foot of the well center, and the foot is connected with the drilling platform by the tensioning device;

[0007] A first lifting device is arranged at the eccentric proximal end of the well center along the lateral direction, the lateral well center eccentric proximal end foot is lifted, and the coordinates of the well center and the well center of the drilling platform are monitored in real time until the lateral deviation A is zero;

[0008] A second lifting device is arranged at the eccentric proximal end of the well center along the longitudinal direction, the longitudinal well center eccentric proximal end foot is lifted, and the coordinates of the well center and the well center of the drilling platform are monitored in real time until the longitudinal deviation B is zero;

[0009] After the lateral and longitudinal inclination adjustment of the well center is completed, appropriate adjustment shims are selected to support the lateral well center eccentric proximal end foot and the longitudinal well center eccentric proximal end foot, and the drilling platform and the well center are locked;

[0010] The tensioning device, the first lifting device and the second lifting device are removed.

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

[0012] Four derrick bases are arranged on the drilling platform, and four feet of the derrick are connected with the derrick bases through fasteners;

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

[0014] Further preferably, the step of arranging a tensioning device at the foot of the derrick and connecting the foot with the drilling platform by using the tensioning device comprises:

[0015] A fixed fulcrum is arranged at the foot, a tensioning device is arranged on the drilling platform, and the tensioning device is arranged on the opposite sides of the foot along the lateral direction and the longitudinal direction, and a steel wire rope is connected between the fixed fulcrum and the tensioning device;

[0016] A flower basket 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 along the lateral direction, lifting the lateral derrick eccentric proximal foot and monitoring the coordinates of the well center of the derrick and the well center of the drilling platform in real time until the lateral deviation A is zero comprises:

[0018] A first code plate is arranged at the lateral derrick eccentric proximal foot, and a first connecting piece is used to lock the lateral derrick eccentric proximal foot and the first code plate, so that the first code plate is parallel to the drilling platform;

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

[0020] The second fastener of the lateral derrick eccentric proximal foot and the lateral proximal base is removed, the first fastener of the lateral derrick eccentric distal foot and the lateral distal base is loosened, and the first jacking mechanism lifts the first code plate to move upward and lift the lateral derrick eccentric proximal foot;

[0021] The flower basket tensioner is adjusted, the coordinates X0Y0 of the well center of the drilling platform and the coordinates X1Y1 of the well center of the derrick are monitored in real time, and the first jacking mechanism stops working until the lateral deviation A is reduced to zero.

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

[0023] A second code plate is installed on the eccentric proximal support of the longitudinal derrick, and the eccentric proximal support and the second code plate are locked together by a second connector, so that the second code plate is parallel to the drilling platform;

[0024] A second lifting mechanism is provided on the drilling rig, and the output end of the second lifting mechanism is connected to the second code plate;

[0025] Remove the fourth fastener between the longitudinal derrick eccentric proximal support and the longitudinal proximal base, loosen the third fastener between the longitudinal derrick eccentric distal support and the longitudinal distal base, and the second lifting mechanism lifts the second code plate upward to raise the longitudinal derrick eccentric proximal support.

[0026] Adjust the basket tensioner and monitor the coordinates X0Y0 of the wellhead center and X1Y1 of the derrick center in real time until the longitudinal deviation B is reduced to zero, at which point the second lifting mechanism stops operating.

[0027] More preferably, before the first lifting mechanism and the second lifting mechanism lift, a three-dimensional model is used to simulate and calculate the preliminary values ​​of the eccentric proximal support legs of the transverse derrick and the eccentric proximal support legs of the longitudinal derrick, respectively. The lifting amount of the first lifting mechanism and the second lifting mechanism is determined based on the preliminary values.

[0028] More preferably, after the lateral and longitudinal tilt adjustments of the derrick center are completed, the steps of selecting appropriate adjusting shims to support the lateral derrick eccentric proximal support and the longitudinal derrick eccentric proximal support, and locking the drilling platform and derrick, include:

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

[0030] More preferably, after the lateral and longitudinal tilt adjustments of the derrick center are completed, the steps of selecting appropriate adjusting shims to support the lateral derrick eccentric proximal support and the longitudinal derrick eccentric proximal support, and locking the drilling platform and derrick, further include:

[0031] When the lateral deviation B is reduced to zero, the second lifting mechanism stops operating. The gap between the longitudinal derrick eccentric proximal support and the longitudinal proximal base is measured. A second adjusting shim of appropriate thickness is placed between the longitudinal derrick eccentric proximal support and the longitudinal proximal base.

[0032] More preferably, after the lateral and longitudinal tilt adjustments of the derrick center are completed, the steps of selecting appropriate adjusting shims to support the lateral derrick eccentric proximal support and the longitudinal derrick eccentric proximal support, and locking the drilling platform and derrick, further include:

[0033] After adding the adjusting shims, the first fastener is used to lock the transverse derrick eccentric distal end support and the transverse distal end base. The second fastener is used to lock the transverse derrick eccentric proximal end support, the first adjusting shim, and the transverse proximal end base. The third fastener is used to lock the longitudinal derrick eccentric distal end support and the longitudinal distal end base. The fourth fastener is used to lock the longitudinal derrick eccentric proximal end support, the second adjusting shim, and the longitudinal proximal end base.

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

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

[0036] The method for precise alignment adjustment of the well core provided by this invention has the following advantages compared with the prior art:

[0037] This invention calculates the lateral deviation A and longitudinal deviation B of the derrick center based on coordinates X0Y0 and X1Y1, determines the adjustment gap between the derrick and the base that needs to be adjusted, uses a tensioning device to fix the derrick to prevent it from tipping over during the adjustment process, uses a first lifting device to lift the derrick to achieve lateral adjustment of the derrick center, and uses a second lifting device to lift the derrick to achieve longitudinal adjustment of the derrick center. 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 use of a large crane, is simple to operate, safe to work, and economical. Attached Figure Description

[0038] Figure 1 This is a flowchart of a method for precise adjustment of derrick center alignment according to the present invention.

[0039] Figure 2 This is a top view of the derrick and drilling platform described in this invention.

[0040] Figure 3 This is a lateral side view (eccentric state) of the derrick described in this invention.

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

[0042] Figure 5 This is a lateral side view (alignment state) of the derrick described in this invention.

[0043] Figure 6 is the wellhead of the present invention Figure 5 is an enlarged schematic view of D in the present invention.

[0044] Figure 7 is a longitudinal side view of the wellhead of the present invention (off-center condition).

[0045] Figure 8 is the wellhead of the present invention Figure 7 is an enlarged schematic view of E in the present invention.

[0046] Figure 9 is a longitudinal side view of the wellhead of the present invention (on-center condition).

[0047] Figure 10 is the wellhead of the present invention Figure 9 is an enlarged schematic view of F in the present invention.

[0048] Reference Signs:

[0049] 10, rig floor; 11, rig floor well center; 12, wellhead base; 121, lateral distal base; 122, lateral proximal base; 123, longitudinal distal base; 124, longitudinal proximal base; 13, drawworks; 14, first fastener; 15, second fastener; 16, third fastener; 17, fourth fastener;

[0050] 20, wellhead; 21, wellhead well center; 22, lateral wellhead off-center distal leg; 23, lateral wellhead off-center proximal leg; 24, fixed pivot point; 25, wireline; 26, flower basket tensioner; 27, first connector; 28, first drawworks; 29, first jacking mechanism; 210, first adjustment shim; 211, longitudinal wellhead off-center distal leg; 212, longitudinal wellhead off-center proximal leg; 213, second connector; 214, second drawworks; 215, second jacking mechanism; 216, second adjustment shim. DETAILED DESCRIPTION

[0051] The specific embodiments of the present invention will be further described with reference to the drawings and examples. The following examples are intended to illustrate the present invention and are not intended to limit the scope of the present invention.

[0052] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like with respect to the present application is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0053] The terms "first", "second", "third", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0054] In addition, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be broadly understood, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or it can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0055] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0056] It should be noted that when an element is referred to as "fixed to" or "provided on" another element, it can be directly on the other element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0057] As Figures 1-10 shown, the present application provides a kind of derrick well center alignment accurate adjustment method, comprising the following steps:

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

[0059] S2: at the foot of the derrick 20, arrange the tensioning device, connect the foot with the drilling floor 10 by using the tensioning device;

[0060] S3: along the lateral direction, set the first lifting device at the eccentric proximal end of the derrick 20, lift the lateral derrick eccentric proximal end foot 23 and monitor the coordinates of the derrick well center 21 and the drilling floor well center 11 in real time, until the lateral deviation A is zero;

[0061] S4: along the longitudinal direction, set the second lifting device at the eccentric proximal end of the derrick 20, lift the longitudinal derrick eccentric proximal end foot 212 and monitor the coordinates of the derrick well center 21 and the drilling floor well center 11 in real time, until the longitudinal deviation B is zero;

[0062] S5: after the lateral and longitudinal inclination adjustment of the derrick well center 21 is completed, select appropriate adjustment shims to support the lateral derrick eccentric proximal end foot 23 and the longitudinal derrick eccentric proximal end foot 212, and lock the drilling floor 10 and the derrick 20;

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

[0064] The purpose of the embodiment is to realize the adjustment and alignment of the derrick well center 21 and the drilling floor well center 11 by using a simple means (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 coordinates X0Y0 and X1Y1, determine the adjustment gap between the derrick and the base that needs to be adjusted, fix the derrick 20 by using the tensioning device to prevent the derrick well center 21 from toppling during adjustment, realize the lateral adjustment of the derrick well center 21 by using the first lifting device to jack up the derrick 20, realize the longitudinal adjustment of the derrick well center 21 by using the second lifting device to jack up the derrick 20, after adjustment, remove the tensioning device, the first lifting device and the second lifting device, so that large cranes are not needed, the operation is simple, the operation is safe, it is economical and applicable, and the adjustment method of the present application can ensure the installation precision of the derrick 20, thereby ensuring the installation precision of the top drive and the top drive guide rail, the pointer beam, the movable yoke and the pipe rack machine, and the drilling and production equipment can run 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 lateral coordinate as X and the longitudinal coordinate as Y, then the lateral deviation A = |X1-X0| and the longitudinal deviation B = |Y1-Y0|. In the adjustment process, the derrick 20 is lifted in the lateral and longitudinal directions to make A = 0 and B = 0, so as to realize the alignment of the rig well center 11 and the derrick well center 21.

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

[0068] Exemplarily, in the step S1, the step of assembling the rig 10 and the derrick 20 and measuring the coordinates X0Y0 of the rig well 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 comprises:

[0069] S11: arranging four derrick bases 12 on the rig 10, and connecting the four feet of the derrick 20 to the derrick bases 12 through fasteners;

[0070] S12: according to the lateral deviation A and the longitudinal deviation B, dividing the four feet of the derrick 20 into a lateral derrick eccentric distal foot 22, a lateral derrick eccentric proximal foot 23, a longitudinal derrick eccentric distal foot 211 and a longitudinal derrick eccentric proximal foot 212, and connecting them to the corresponding derrick bases 12.

[0071] Exemplarily, in order to prevent the derrick 20 from falling during the adjustment of the derrick well center 21, in the step S2, the step of arranging a tensioning device at the feet of the derrick 20 and connecting the feet to the rig 10 by the tensioning device comprises:

[0072] S21: arranging a fixed fulcrum 24 at the feet, arranging a tensioning rod 13 on the rig 10, each of the feet being provided with the tensioning rod on opposite sides in the lateral and longitudinal directions, and connecting a steel wire rope 25 between the fixed fulcrum 24 and the tensioning rod 13;

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

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

[0075] Exemplarily, in the step S3, the step of arranging a first lifting device at the eccentric proximal end of the derrick 20 in the lateral direction, lifting the lateral derrick eccentric proximal foot 23 and monitoring the coordinates of the derrick well center 21 and the rig well center 11 in real time until the lateral deviation A is zero comprises:

[0076] S31: setting a first code plate 28 on the lateral derrick eccentric proximal leg 23, and locking the lateral derrick eccentric proximal leg 23 and the first code plate 28 through the first connecting piece 27, so that the first code plate 28 is parallel to the drilling platform 10;

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

[0078] S33: removing the second fastener 15 of the lateral derrick eccentric proximal leg 23 and the lateral proximal base 122, loosening the first fastener 14 of the lateral derrick eccentric distal leg 22 and the lateral distal base 121, and lifting the first code plate 28 upward by the first jacking mechanism 29 to lift the lateral derrick eccentric proximal leg 23;

[0079] S34: adjusting the basket tensioner 26, and monitoring 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 jacking mechanism 29 stops working.

[0080] In this way, the first jacking mechanism 29 pushes the lateral derrick eccentric proximal leg 23 upward through the first code plate 28, so that the derrick well center 21 moves in the lateral direction to the vertical line where the drilling platform wellhead center 11 is located, so that the lateral deviation A gradually reduces to zero, and the basket tensioner 26 can be quickly operated to improve the lateral alignment efficiency and accuracy, as shown in Figure 5 and Figure 6 .

[0081] Exemplarily, in step S4, the step of setting a second lifting device on the eccentric proximal end of the derrick 20 in the longitudinal direction, lifting the longitudinal derrick eccentric proximal leg 212, 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 code plate 214 on the longitudinal derrick eccentric proximal leg 212, and locking the longitudinal derrick eccentric proximal leg 212 and the second code plate 214 through the second connecting piece 213, so that the second code plate 214 is parallel to the drilling platform 10;

[0083] S42: setting a second jacking mechanism 215 on the drilling platform 10, and connecting the output end of the second jacking mechanism 215 with the second code plate 214;

[0084] S43: removing the fourth fastener 17 of the longitudinal derrick eccentric proximal leg 212 and the longitudinal proximal base 124, loosening the third fastener 16 of the longitudinal derrick eccentric distal leg 211 and the longitudinal distal base 123, and lifting the second code plate 214 upward by the second jacking mechanism 215 to lift the longitudinal derrick eccentric proximal leg 212.

[0085] S44: Adjusting the basket tensioner 26, real-time monitoring the coordinates X0Y0 of the rig well center 11 and the coordinates X1Y1 of the derrick well center 21, until the longitudinal deviation B is reduced to zero, and the second jacking mechanism 215 stops working.

[0086] In this way, the second jacking mechanism 215 pushes the longitudinal derrick eccentric proximal leg 212 to lift through the second code plate 214, so that the derrick well center 21 moves longitudinally to the vertical line where the rig well center 11 is located, so that the longitudinal deviation B gradually reduces to zero, and the basket tensioner 26 can be quickly operated to improve the longitudinal alignment efficiency and accuracy, as shown in Figure 9 and Figure 10 .

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

[0088] Exemplarily, before the first jacking mechanism 29 and the second jacking mechanism 215 are lifted, the preliminary values required to lift the transverse derrick eccentric proximal leg 23 and the longitudinal derrick eccentric proximal leg 212 are calculated through three-dimensional model simulation respectively, and the lifting amount of the first jacking mechanism 29 and the second jacking mechanism 215 is determined according to the preliminary values, to ensure the accuracy and efficiency of the adjustment.

[0089] Exemplarily, after the transverse and longitudinal inclination adjustment of the derrick well center 21 is completed in step S5, the steps of selecting appropriate adjustment shims to support the transverse derrick eccentric proximal leg 23 and the longitudinal derrick eccentric proximal leg 212, and locking the rig 10 and the derrick 20 include:

[0090] S51: When the transverse deviation A is reduced to zero, the first jacking mechanism 29 stops working, the gap size between the transverse derrick eccentric proximal leg 23 and the transverse proximal base 122 is measured, and the first adjustment shim 210 with appropriate thickness is placed between the transverse derrick eccentric proximal leg 23 and the transverse proximal base 122;

[0091] S52: When the transverse deviation B is reduced to zero, the second jacking mechanism 215 stops working, the gap size between the longitudinal derrick eccentric proximal leg 212 and the longitudinal proximal base 124 is measured, and the second adjustment shim 216 with appropriate thickness is placed between the longitudinal derrick eccentric proximal leg 212 and the longitudinal proximal base 124;

[0092] S53: After the adjustment gasket is added, the transverse derrick eccentric distal end support 22 and the transverse distal base 121 are locked by the first fastener 14, the transverse derrick eccentric proximal end support 23, the first adjustment gasket 210 and the transverse proximal base 122 are locked by the second fastener 15, the longitudinal derrick eccentric distal end support 211 and the longitudinal distal base 123 are locked by the third fastener 16, and the longitudinal derrick eccentric proximal end support 212, the second adjustment gasket 216 and the longitudinal proximal base 124 are locked by the fourth fastener 17.

[0093] In this way, after the derrick 20 is lifted in the transverse and longitudinal directions, the adjustment gasket is needed to fill the lifting gap to ensure the balance and stability of the derrick 20 connected with the drilling platform 10 after the tensioning device, the first lifting device and the second lifting device are removed.

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

[0095] S61: The tensioning device 13, the steel wire rope 25, the flower basket tensioner 26, the first code plate 28, the first jacking mechanism 29, the second code plate 214 and the second jacking mechanism 215 are removed.

[0096] In some embodiments, it is also needed to polish the removal site to avoid cutting the equipment, instruments or workers.

[0097] In summary, the embodiment of the present application provides a derrick well center alignment accurate adjustment method, which calculates the transverse deviation A and the longitudinal deviation B of the derrick well center 21 according to the coordinates X0Y0 and X1Y1, determines the adjustment gap needed to be adjusted between the derrick and the base, fixes the derrick 20 by the tensioning device to prevent the derrick well center 21 from falling during the adjustment process, realizes the transverse adjustment of the derrick well center 21 by the first lifting device jacking the derrick 20, realizes the longitudinal adjustment of the derrick well center 21 by the second lifting device jacking the derrick 20, and after the adjustment is completed, the tensioning device, the first lifting device and the second lifting device are removed. In this way, it does not need to cooperate with a large crane, the operation is simple, the operation is safe, and it is economical and applicable.

[0098] The above merely describes the preferred embodiments of the present application, and it should be pointed out that those skilled in the art can make several improvements and replacements without departing from the technical principles of the present application, and these improvements and replacements should also be considered as the protection scope of the present application. The basic principles, main features and advantages of the present application are shown and described above, and it is obvious for those skilled in the art that the present application is not limited to the details of the above preferred embodiments, and the embodiments should be considered as exemplary and non-limiting, the scope of the present application is defined by the appended claims instead of the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims should be included in the present application.

[0099] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in the embodiments can also be properly combined to form other embodiments which can be understood by those skilled in the art.

Claims

1. A method for precise adjustment of derrick center alignment, characterized in that, Includes the following steps: Assemble the drilling platform and derrick and measure the coordinates X0Y0 of the wellhead center of the drilling platform and the coordinates X1Y1 of the wellhead center of the derrick. Calculate the lateral deviation A and longitudinal deviation B of the wellhead center of the derrick based on the coordinates X0Y0 and X1Y1. Four derrick bases are arranged on the drilling rig, and the four legs of the derrick are connected to the derrick bases by fasteners; Based on the lateral deviation A and the longitudinal deviation B, the four legs of the derrick are divided into the lateral derrick eccentric distal end leg, the lateral derrick eccentric proximal end leg, the longitudinal derrick eccentric distal end leg, and the longitudinal derrick eccentric proximal end leg, and are respectively connected to the corresponding derrick base. Tensioning devices are installed at the legs of the derrick to connect the legs to the drilling platform; Fixed fulcrums are arranged on the legs, and pull weights are arranged on the drilling platform. Each leg is provided with pull weights on opposite sides along the transverse and longitudinal directions, and a steel wire rope is connected between the fixed fulcrums and the pull weights. Install a basket tensioner on the wire rope; Along the lateral direction, a first lifting device is set at the eccentric proximal end of the derrick to lift the eccentric proximal end support of the derrick and monitor the coordinates of the derrick center and the drilling platform wellhead center in real time until the lateral deviation A is zero. A first code plate is installed on the eccentric proximal support of the transverse derrick, and the eccentric proximal support of the transverse derrick and the first code plate are locked together by a first connector, so that the first code plate is parallel to the drilling platform. A first lifting mechanism is provided on the drilling rig, and the output end of the first lifting mechanism is connected to a first code plate. Remove the second fastener between the eccentric proximal support foot and the eccentric proximal base of the transverse derrick, loosen the first fastener between the eccentric distal support foot and the eccentric distal base of the transverse derrick, and the first lifting mechanism lifts the first code plate and moves it upward to raise the eccentric proximal support foot of the transverse derrick. Adjust the basket tensioner and monitor the coordinates X0Y0 of the wellhead center and X1Y1 of the derrick center in real time until the lateral deviation A is reduced to zero, at which point the first lifting mechanism stops operating. Along the longitudinal direction, a second lifting device is installed at the eccentric proximal end of the derrick to lift the longitudinal eccentric proximal end support leg and monitor the coordinates of the derrick center and the drilling platform wellhead center in real time until the longitudinal deviation B is zero. After the lateral and longitudinal tilt of the derrick center is adjusted, appropriate adjusting shims are used to support the lateral derrick eccentric proximal support and the longitudinal derrick eccentric proximal support, and the drilling platform and derrick are locked. Remove the tensioning device, the first lifting device, and the second lifting device.

2. The method for precise adjustment of derrick center alignment according to claim 1, characterized in that, The step of installing a second lifting device at the eccentric proximal end of the derrick along the longitudinal direction, lifting the longitudinal derrick eccentric proximal end support, and monitoring the coordinates of the derrick center and the wellhead center of the drilling platform in real time until the longitudinal deviation B is zero includes: A second code plate is installed on the eccentric proximal end support of the longitudinal derrick, and the eccentric proximal end support and the second code plate are locked by a second connector, so that the second code plate is parallel to the drilling platform; A second lifting mechanism is provided on the drilling rig, and the output end of the second lifting mechanism is connected to the second code plate; Remove the fourth fastener between the longitudinal derrick eccentric proximal support and the longitudinal proximal base, loosen the third fastener between the longitudinal derrick eccentric distal support and the longitudinal distal base, and the second lifting mechanism lifts the second code plate upward to raise the longitudinal derrick eccentric proximal support. Adjust the basket tensioner and monitor the coordinates X0Y0 of the wellhead center and X1Y1 of the derrick center in real time until the longitudinal deviation B is reduced to zero, at which point the second lifting mechanism stops operating.

3. The method for precise adjustment of derrick center alignment according to claim 2, characterized in that, Before the first and second lifting mechanisms are lifted, preliminary values ​​for raising the eccentric proximal support legs of the transverse and longitudinal derricks are calculated using a three-dimensional model simulation. The lifting amount of the first and second lifting mechanisms is then determined based on these preliminary values.

4. The method for precise adjustment of derrick center alignment according to claim 3, characterized in that, After the lateral and longitudinal tilt adjustments of the derrick center are completed, the steps of selecting appropriate adjusting shims to support the lateral derrick eccentric proximal support and the longitudinal derrick eccentric proximal support, and locking the drilling platform and derrick, include: When the lateral deviation A is reduced to zero, the first lifting mechanism stops operating, the gap between the lateral derrick eccentric proximal support and the lateral proximal base is measured, and a first adjusting shim of appropriate thickness is placed between the lateral derrick eccentric proximal support and the lateral proximal base.

5. The method for precise adjustment of derrick center alignment according to claim 4, characterized in that, After the lateral and longitudinal tilt adjustments of the derrick center are completed, the steps of selecting appropriate adjusting shims to support the lateral derrick eccentric proximal support and the longitudinal derrick eccentric proximal support, and locking the drilling platform and derrick, also include: When the lateral deviation B is reduced to zero, the second lifting mechanism stops operating. The gap between the longitudinal derrick eccentric proximal support and the longitudinal proximal base is measured. A second adjusting shim of appropriate thickness is placed between the longitudinal derrick eccentric proximal support and the longitudinal proximal base.

6. The method for precise adjustment of derrick center alignment according to claim 5, characterized in that, After the lateral and longitudinal tilt adjustments of the derrick center are completed, the steps of selecting appropriate adjusting shims to support the lateral derrick eccentric proximal support and the longitudinal derrick eccentric proximal support, and locking the drilling platform and derrick, also include: After adding the adjusting shims, the first fastener is used to lock the transverse derrick eccentric distal end support and the transverse distal end base. The second fastener is used to lock the transverse derrick eccentric proximal end support, the first adjusting shim, and the transverse proximal end base. The third fastener is used to lock the longitudinal derrick eccentric distal end support and the longitudinal distal end base. The fourth fastener is used to lock the longitudinal derrick eccentric proximal end support, the second adjusting shim, and the longitudinal proximal end base.

7. The method for precise adjustment of derrick center alignment according to claim 6, characterized in that, The steps for removing the tensioning device, the first lifting device, and the second lifting device to complete the adjustment include: Remove the pull bar, wire rope, basket tensioner, first code plate, first lifting mechanism, second code plate and second lifting mechanism.

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