Method and device for selecting a ship for the positioning operation of an offshore oilfield

Abstract

The present invention provides a method and device for selecting a ship for in-place operation in an offshore oilfield. The method includes: obtaining basic parameter information and calculating the values of each parameter; determining the value of each first preferred parameter and its first preset threshold range; sequentially judging whether the value of each first preferred parameter satisfies the first preset threshold range in the order of water depth at the operation site, pile penetration depth into the mud, maximum allowable value of the ship lifting air gap, covered area of the rotary table center, and drilling load; if not, ending; if so, determining the value of each second preferred parameter and its corresponding second preset threshold range; sequentially judging whether the value of each second preferred parameter in each second group of preferred parameters satisfies the second preset threshold range in the order of pile penetration anti-slip rate and pile penetration anti-puncture rate; if not, ending; if so, outputting the corresponding pending drilling ship name as the result. The present invention can improve the ship selection efficiency and the accuracy of in-place operation, and ensure the safety of on-site pile penetration and the anti-collision safety of large facilities.

Description

Technical Field

[0001] The present invention relates to the technical field of oil drilling, and particularly to a method and device for selecting a ship for in-position operation in an offshore oilfield. Background Art

[0002] At present, the development and exploitation of offshore oilfields have been intensified. 80% of the development of offshore oilfields is completed by drilling ships. Using a drilling ship for in-position operation is the premise and foundation of oilfield development and exploitation. Whether a drilling ship meets the requirements of development operations needs to be analyzed from multiple aspects, and finally it is determined which drilling platforms are competent for in-position operations. The traditional method for selecting a ship is that engineers select a ship through data collection, parameter analysis, matching analysis, etc. However, when the number of drilling ships and the workload of in-position operations are increasing, and the requirements for production progress are getting higher and higher, the traditional method for selecting a ship exposes the disadvantages of low efficiency, low accuracy, and high risk in offshore implementation, resulting in deviations between ship selection and actual in-position operations, which not only affects the safety of offshore oilfield facilities, but also delays the progress of oilfield development operations. Summary of the Invention

[0003] The present invention provides a method and device for selecting a ship for in-position operation in an offshore oilfield, which can facilitate the selection of a reasonable drilling ship for development wells and adjustment wells during the in-position operation of an offshore oilfield, improve the efficiency of ship selection and the accuracy of in-position operations, and can ensure the safety of on-site pile insertion and the anti-collision safety of large facilities, and promote the development process of offshore oilfields.

[0004] In a first aspect, the present invention provides a method for selecting a ship for in-position operation in an offshore oilfield, including:

[0005] Obtaining basic parameter information, where the basic parameter information includes the basic parameter information of multiple to-be-determined drilling ships and the basic parameter information of a target operation location;

[0006] Determining the value of each first preferred parameter in a first set of preferred parameters corresponding to each to-be-determined drilling ship according to the basic parameter information, and a first preset threshold range corresponding to each first preferred parameter; wherein, the first preferred parameters include water depth at the operation site, pile insertion depth into the mud, maximum allowable value of lifting air gap, turntable center coverage area, and drilling load;

[0007] Sequentially determining whether the value of each first preferred parameter in the first set of preferred parameters corresponding to each to-be-determined drilling ship satisfies the first preset threshold range in a preset order;

[0008] If not, the process ends;

[0009] If so, determine the value of each second preferred parameter in the second set of preferred parameters corresponding to each to-be-determined drilling vessel according to the basic parameter information, and the second preset threshold range corresponding to each second preferred parameter; wherein, the second preferred parameters include the spudcan anti-slip rate and the spudcan anti-puncture rate;

[0010] Judging in a preset order whether the value of each second preferred parameter in the second set of preferred parameters corresponding to each to-be-determined drilling vessel satisfies the second preset threshold range;

[0011] If not, the process ends;

[0012] If so, output the name of the corresponding to-be-determined drilling vessel as the result;

[0013] Wherein, both the first set of preferred parameters and the second set of preferred parameters include the operation location preferred parameters determined according to the basic parameter information of the target operation location and the drilling vessel preferred parameters of multiple to-be-determined drilling vessels determined according to the basic parameter information of multiple to-be-determined drilling vessels; both the first preset threshold range and the second preset threshold range include the operation location parameter threshold range determined according to the basic parameter information of the target operation location and the drilling vessel parameter threshold range of multiple to-be-determined drilling vessels determined according to the basic parameter information of multiple to-be-determined drilling vessels.

[0014] In an alternative embodiment, the basic parameter information of the to-be-determined drilling vessel includes the overlapping area between the drilling vessel and the old footprint, and the value of the spudcan anti-slip rate is determined according to the overlapping area between the drilling vessel and the old footprint.

[0015] In an alternative embodiment, the basic parameter information of the to-be-determined drilling vessel further includes the unit pressure of the drilling vessel, and the value of the spudcan anti-puncture rate is determined according to the unit pressure of the drilling vessel.

[0016] In an alternative embodiment, the basic parameter information of the to-be-determined drilling vessel further includes the full load draft value of the drilling vessel, the total length of the drilling vessel's legs, the maximum allowable value of the spudcan depth, the maximum allowable value of the drilling vessel's jack-up air gap, and the reserved length of the legs. The first preset threshold range corresponding to the water depth at the operation site is:

[0017] The minimum allowable value of the operation water depth > the full load draft of the drilling vessel, and,

[0018] The maximum allowable value of the operation water depth ≤ the total length of the drilling vessel's legs - (the maximum allowable value of the spudcan depth + the maximum allowable value of the drilling vessel's jack-up air gap + the reserved length of the legs).

[0019] In an alternative embodiment, the basic parameter information of the to-be-determined drilling vessel further includes the minimum allowable value of the spudcan depth. The first preset threshold range corresponding to the spudcan penetration depth into the mud is:

[0020] The minimum allowable value of the pile insertion depth ≤ the pile insertion depth into the mud ≤ the maximum allowable value of the pile insertion depth

[0021] Among them, the pile insertion depth into the mud is determined according to the pile insertion depth curve; the minimum allowable value of the pile insertion depth is determined according to the height value from the tip of the drilling ship's pile to the maximum cross-sectional area of the pile shoe.

[0022] In an alternative embodiment, the first preset threshold range corresponding to the maximum allowable value of the jacking air gap is as follows:

[0023] The maximum allowable value of the jacking air gap ≤ the total length of the drilling ship's legs - (the maximum allowable value of the operating water depth + the maximum allowable value of the pile insertion depth + the reserved length of the legs).

[0024] In an alternative embodiment, the basic parameter information of the target operation location includes the wellhead area of the production platform, and the first preset threshold range corresponding to the covered area of the rotary table center is: the covered area of the rotary table center covers the wellhead area of the production platform.

[0025] In an alternative embodiment, the basic parameter information of the to-be-determined drilling ship includes the lateral displacement of the rotary table center and the longitudinal displacement of the rotary table center, and the first preset threshold range corresponding to the drilling load is: the drilling load > the load required for wellhead operation, where the load required for wellhead operation is determined according to the lateral displacement of the rotary table center and the longitudinal displacement of the rotary table center.

[0026] In an alternative embodiment, the basic parameter information of the to-be-determined drilling ship further includes the height from the sea level at high tide to the seabed, and the first preset threshold range corresponding to the water depth at the operation location is:

[0027] The water depth at the operation location < the height from the sea level at high tide to the seabed.

[0028] In a second aspect, the present invention provides an offshore oilfield positioning operation ship selection device, including:

[0029] An acquisition module, configured to acquire basic parameter information, where the basic parameter information includes the basic parameter information of multiple to-be-determined drilling ships and the basic parameter information of the target operation location;

[0030] A determination module, configured to determine the value of each first preferred parameter in the first set of preferred parameters corresponding to each to-be-determined drilling ship according to the basic parameter information, and the first preset threshold range corresponding to each first preferred parameter; among them, the first preferred parameters include the water depth at the operation location, the pile insertion depth into the mud, the maximum allowable value of the jacking air gap, the covered area of the rotary table center, and the drilling load;

[0031] A first judgment module, configured to sequentially judge whether the value of each first preferred parameter in the first set of preferred parameters corresponding to each to-be-determined drilling ship meets the first preset threshold range according to a preset order;

[0032] If the answer is no, the process ends;

[0033] If the answer is yes, determine the value of each second preferred parameter in the second set of preferred parameters corresponding to each to-be-determined drilling vessel according to the basic parameter information, and the second preset threshold range corresponding to each second preferred parameter; wherein, the second preferred parameters include the pile-insertion anti-slip rate and the pile-insertion anti-puncture rate;

[0034] The second judgment module sequentially judges whether the value of each second preferred parameter in the second set of preferred parameters corresponding to each to-be-determined drilling vessel satisfies the second preset threshold range in a preset order;

[0035] If the answer is no, the process ends;

[0036] If the answer is yes, output the name of the corresponding to-be-determined drilling vessel as the result;

[0037] Wherein, both the first set of preferred parameters and the second set of preferred parameters include the operation location preferred parameters determined according to the basic parameter information of the target operation location and the drilling vessel preferred parameters of multiple to-be-determined drilling vessels determined according to the basic parameter information of multiple to-be-determined drilling vessels; both the first preset threshold range and the second preset threshold range include the operation location parameter threshold range determined according to the basic parameter information of the target operation location and the drilling vessel parameter threshold range of multiple to-be-determined drilling vessels determined according to the basic parameter information of multiple to-be-determined drilling vessels.

[0038] The beneficial effects of the present invention are as follows: The method and device for selecting a ship for the in-position operation of an offshore oilfield of the present invention establish a new modular ship selection method, break through the limitations of manual ship selection, and are conducive to selecting a reasonable drilling vessel for development wells and adjustment wells during the in-position operation of an offshore oilfield, promoting the development process of the offshore oilfield; improve the ship selection efficiency and the accuracy of the in-position operation, making the drilling vessel more matched and scientific with the production platform; consider the pile-insertion slip and pile-insertion puncture situations, ensure the pile-insertion safety, avoid the collision between the drilling platform and the production platform, and ensure the in-position safety and the safety of large facilities; the anti-collision safety of large facilities.

[0039] Other features and advantages of the present invention will be described in the following specification, and part of them will become obvious from the specification or be understood by implementing the present invention. The objectives and other advantages of the present invention are achieved and obtained by the structures specifically pointed out in the specification and the drawings.

[0040] To make the above objectives, features, and advantages of the present invention more obvious and understandable, the following specific preferred embodiments are given, and in conjunction with the accompanying drawings, the detailed description is as follows. Description of the Drawings

[0041] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0042] Figure 1 is a schematic flow diagram of the present invention;

[0043] Figure 2 is a schematic vertical side view of the drilling ship of the present invention;

[0044] Figure 3 is a schematic top deck plan view of the present invention;

[0045] Figure 4 is a schematic diagram of the drilling load of the present invention;

[0046] Figure 5 is a schematic diagram of the vertical relationship of water depth, pile penetration depth, and ship lifting air gap of the present invention;

[0047] Figure 6 is a schematic diagram of the horizontal space coverage range of the present invention;

[0048] Figure 7 is a schematic diagram of the pile penetration curve of the present invention;

[0049] Figure 8 is another schematic diagram of the pile penetration curve of the present invention;

[0050] Figure 9 is a schematic diagram of the system principle of the present invention.

[0051] In the figure: 81 - acquisition module; 82 - determination module; 83 - first judgment module; 84 - second judgment module. Specific Embodiments

[0052] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions of the present invention with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0053] For ease of understanding of this embodiment, the following will introduce in detail a method for selecting a ship for offshore oilfield positioning operations disclosed by the present invention through an embodiment.

[0054] Refer to Figure 1, this embodiment provides a method for selecting a ship for offshore oilfield positioning operations, including:

[0055] Step S10, obtaining basic parameter information, where the basic parameter information includes the basic parameter information of multiple pending drilling ships and the basic parameter information of the target operation location.

[0056] Specifically, the basic parameter information of the pending drilling ship includes: the full-load draft value of the drilling ship, the total length of the drilling ship's leg, the maximum allowable value of the pile insertion depth, the maximum allowable value of the lifting air gap of the drilling ship, the remaining length of the leg, the minimum allowable value of the pile insertion depth, the lateral displacement of the rotary table center, the longitudinal displacement of the rotary table center, the overlapping area between the drilling ship and the old footprint, the unit pressure of the drilling ship, the height from the sea level at high tide to the seabed, etc. In addition, in this embodiment, the basic parameter information of the target operation location includes the wellhead area of the production platform.

[0057] Step S20, determining the value of each first preferred parameter in the first set of preferred parameters corresponding to each pending drilling ship according to the basic parameter information, and the first preset threshold range corresponding to each first preferred parameter; wherein, the first preferred parameters include the water depth at the operation location, the pile insertion depth into the mud, the maximum allowable value of the lifting air gap, the coverage area of the rotary table center, and the drilling load. For example, Figure 5 Among them, Lz represents the total length of the leg; L1 represents the leg margin, and its value is greater than 1.5 meters; L2 represents the height of the fixed pile area, and its value is 8.8 meters; L3 represents the height of the hull, and its value is 9.4 meters; L4 represents the lifting air gap, and its value is 14 meters; L5 represents the water depth at the operation location, and its value is 105 meters, and L6 represents the pile insertion depth into the mud, and its value is 9.4 meters.

[0058] In this embodiment, there are five first sets of preferred parameters, namely the water depth at the operation location, the pile insertion depth into the mud, the maximum allowable value of the lifting air gap, the coverage area of the rotary table center, and the drilling load.

[0059] Step S30, sequentially determining whether the value of each first preferred parameter in the first set of preferred parameters corresponding to each pending drilling ship satisfies the first preset threshold range in a preset order.

[0060] Here, each pending drilling ship corresponds to a set of first sets of preferred parameters. Therefore, step S30 can be specifically divided into the following steps S31~S35 (steps S31~S35 are not shown in the figure), and the comparison and judgment are carried out sequentially.

[0061] Step S31, determining whether the water depth at the operation location satisfies its corresponding first preset threshold range.

[0062] The water depth at the operation site is used for water depth matching. The principle is to compare the water depth value at the operation site with the range of water depths suitable for the operation of the drilling ship. If the water depth at the operation site is between the minimum allowable value and the maximum allowable value of the water depth suitable for the operation of the drilling ship, it is considered that the water depth matching is successful. Among them, the minimum allowable value of the operation water depth is determined by the full-load draft of the drilling ship, that is:

[0063] The minimum value of the operation water depth > the full-load draft of the drilling ship. This is formula 1.

[0064] The maximum allowable value of the operation water depth is affected by the penetration depth of the drilling ship into the mud, the lifting air gap of the drilling ship, and the reserved length of the leg, that is:

[0065] The maximum allowable value of the operation water depth ≤ the total length of the drilling ship's legs - (the maximum allowable value of the penetration depth + the maximum allowable value of the lifting air gap of the drilling ship + the reserved length of the leg). This is formula 2.

[0066] The above formula 1 and formula 2 can be used as the first preset threshold range to determine the maximum allowable value and the minimum allowable value of the operation water depth at the target operation location, and then determine the penetration depth of each pending drilling ship into the mud, the lifting air gap of the drilling ship, and the reserved length of the leg, and then compare them in combination with formula 1 and formula 2 to judge which drilling ships meet the above formulas.

[0067] In this step, the drilling ships that meet the conditions are screened out according to formula 1 and formula 2. The drilling ships that meet the conditions continue to execute step S32. If there are no drilling ships that meet the conditions, step S40 is executed.

[0068] In addition, the water depth of the sea area at the operation site needs to consider the height of the tide rise and fall, that is, when the height from the sea level to the seabed at high tide is greater than the full-load draft, it is also considered that the matching is successful.

[0069] Step S32, judge whether the penetration depth into the mud meets its corresponding first preset threshold range.

[0070] The penetration depth into the mud is used for penetration depth matching. The principle is that if the penetration depth of the drilling ship into the mud (predicted value) is between the minimum allowable value and the maximum allowable value of the penetration depth, it is considered that the penetration depth matching is successful; among them, the penetration depth into the mud (predicted value) is to predict the penetration depth of the drilling ship at this place according to the soil parameters, issue a penetration report and a penetration depth curve graph, and read the value of the penetration depth into the mud from the penetration depth curve graph.

[0071] The minimum allowable value of the penetration depth is the height value from the tip of the drilling ship's pile to the maximum cross-sectional area of the pile shoe; the maximum allowable value of the penetration depth is affected by the maximum allowable value of the operation water depth, the lifting air gap of the drilling ship, and the reserved length of the leg, that is:

[0072] The allowable maximum jacking depth ≤ the total length of the jacking legs of the drilling ship - (the allowable maximum operating water depth + the allowable maximum lifting air gap of the drilling ship + the reserved length of the jacking legs), which is Equation 3.

[0073] The above Equation 3 can be used as the first preset threshold range. In this step, the drilling ships that meet the conditions are screened out according to Equation 3. The drilling ships that meet the conditions continue to execute Step S33. If there are no drilling ships that meet the conditions, then execute Step S40.

[0074] In addition, within the allowable range of the combined value of the total length of the jacking legs, when the allowable maximum jacking depth and the allowable maximum lifting air gap can meet the operation requirements during operation requirements and some modifications to the drilling ship, it can also be regarded as a successful match.

[0075] Step S33: Determine whether the allowable maximum lifting air gap of the drilling ship meets its corresponding first preset threshold range.

[0076] This step is mainly for the matching of the lifting air gap of the drilling ship. When the bottom of the cantilever beam crosses all obstacles on the top deck of the production platform (as shown in Figure 2 and Figure 3 ), or does not interfere with all obstacles on the top deck of the production platform, the height value that can be achieved is below the allowable maximum lifting air gap of the drilling ship, which is regarded as a successful match of the lifting air gap.

[0077] Among them, the lifting air gap is the height from the sea level to the bottom of the cantilever beam of the drilling ship. The allowable maximum lifting air gap is affected by the allowable maximum jacking depth, the allowable maximum operating water depth, and the reserved length of the jacking legs, that is:

[0078] The allowable maximum lifting air gap ≤ the total length of the jacking legs of the drilling ship - (the allowable maximum operating water depth + the allowable maximum jacking depth + the reserved length of the jacking legs), which is Equation 4.

[0079] The above Equation 4 can be used as the first preset threshold range. In this step, the drilling ships that meet the conditions are screened out according to Equation 4. The drilling ships that meet the conditions continue to execute Step S34. If there are no drilling ships that meet the conditions, then execute Step S40.

[0080] Step S34: Determine whether the area covered by the center of the rotary table meets its corresponding first preset threshold range.

[0081] This step refers to the matching of the coverage range of the center of the rotary table, which is to determine whether the area covered by the center of the rotary table can cover the wellhead of the production platform. If the rectangular frame formed by the lateral coverage range and the longitudinal coverage range of the center of the rotary table of the drilling ship can enclose the wellhead area of the production platform, it is regarded as a successful match between the area covered by the center of the rotary table and the wellhead of the production platform.

[0082] The longitudinal coverage of the turntable center is the maximum displacement that the turntable center can reach after the cantilever beam is pushed out from the stern; the transverse coverage of the turntable center is the maximum displacement of the turntable center to the port and starboard directions based on the centerline of the hull. Therefore, the wellhead area of the production platform can be used as the first preset threshold range. This step selects drilling ships that meet the conditions. The drilling ships that meet the conditions continue to execute step S35. If there are no drilling ships that meet the conditions, step S40 is executed.

[0083] Step S35, determining whether the drilling load satisfies its corresponding first preset threshold range.

[0084] According to the matching result of the turntable center coverage area in the previous step, the lateral and longitudinal displacements of the turntable center are measured for the operating wellheads that need to be covered, and the longitudinal and lateral displacements of the turntable center that need to be moved when covering each wellhead are obtained. Then, the displacements are compared with the drilling ship load table. If the drilling load that the drilling ship can provide is greater than the drilling load required for the well operation, the match is considered successful.

[0085] Among them, the lateral displacement of the turntable center and the longitudinal displacement of the turntable center are based on the lateral and longitudinal displacements corresponding to the alignment of the turntable center with the slot center. Therefore, the first preset threshold range corresponding to the drilling load is the load required for the wellhead operation. This step screens out drilling ships that meet the conditions, and the drilling ships that meet the conditions continue to execute step S50. If there is no drilling ship that meets the conditions, step S40 is executed.

[0086] Step S40: If no, the process ends.

[0087] Step S50, if yes, then determine the value of each second preferred parameter in the second group of preferred parameters corresponding to each pending drilling ship and the second preset threshold range corresponding to each second preferred parameter according to the basic parameter information; wherein the second preferred parameters include the anti-slip rate of the pile and the anti-puncture rate of the pile; if no, the process ends; if yes, the corresponding name of the pending drilling ship is output as the result.

[0088] Step S60: determining in sequence in a preset order whether the value of each second preferred parameter in the second group of preferred parameters corresponding to each pending drilling ship meets a second preset threshold range.

[0089] Among them, the first group of preferred parameters and the second group of preferred parameters both include the preferred parameters of the operating site determined according to the basic parameter information of the target operating site and the drilling ship preferred parameters of multiple pending drilling ships determined according to the basic parameter information of multiple pending drilling ships; the first preset threshold range and the second preset threshold range both include the operating site parameter threshold range determined according to the basic parameter information of the target operating site and the drilling ship parameter threshold range of multiple pending drilling ships determined according to the basic parameter information of multiple pending drilling ships.

[0090] Specifically, in this embodiment, the second group of preferred parameters include the overlapping area between the drilling ship and the old footprint and the unit pressure of the drilling ship (the ratio of the maximum preloading load of different drilling ships to the pile shoe area is the unit pressure). Both the area of the drilling ship and the unit pressure of the drilling ship are basic parameter information of the to-be-determined drilling ship. These two parameters are used as the second preferred parameters for ship selection only when they may occur or have occurred in the pile insertion history. This step can be specifically divided into the following steps S61 to S62 for comparison and judgment in sequence.

[0091] Step S61, determine whether the value of the anti-slip rate during pile insertion and the overlapping area of the old footprint meet the corresponding second preset threshold range.

[0092] The smaller the overlapping area between the drilling ship and the old footprint, the higher the matching degree of the drilling ship. This step screens out the drilling ships that meet the conditions. The drilling ships that meet the conditions continue to execute step S62. If there are no drilling ships that meet the conditions, the process ends.

[0093] Step S62, determine whether the value of the anti-puncture rate during pile insertion and the overlapping area of the old footprint meet the corresponding second preset threshold range.

[0094] If not, execute step S40 to end the process;

[0095] Step S70, if so, output the name of the to-be-determined drilling ship.

[0096] The unit pressure of the drilling ship is more conducive to avoiding puncture, so the matching degree of the drilling ship is higher. This step screens out the drilling ships that meet the conditions and outputs the drilling ships that meet the conditions. If there are no drilling ships that meet the conditions, the process ends.

[0097] The method of this embodiment will be further described by way of example below.

[0098] For example, for a certain production platform in the Bohai Sea, the water depth is 20.1 meters, the elevation of the top deck is 20 meters, and the elevation of the highest obstacle on the top deck is 30 meters. The lifting air gap required to cross the top deck is 30 + 1 meter safety margin = 31 meters. The wellhead is 3×3, and the spacing is 2m×2m. Through measurement, the longitudinal coverage range required to cover the wellhead is 11 meters. Considering the positioning error of 0.3 meters and the safety distance requirement of 1.5 meters, the actual value is 12.8 meters. The lateral coverage range is 3.0 meters to the left and right of the center line of the hull. Considering the positioning error of 0.3 meters, the actual value is 3.6 meters; the maximum drilling load required for 9 wells is 600t.

[0099] Select drilling ships such as "Nanhai No. 1", "Bohai No. 12", the HYSY92 series (921 - 924), "Bohai No. 10", "Bohai No. 4", HYSY932, and HYSY941. Make a list of the preferred parameters for each ship. The data in the list includes basic parameter information such as the maximum allowable value of the operating water depth, the maximum allowable value of the pile penetration depth, the maximum allowable value of the jack-up air gap, and so on.

[0100] Read the list of preferred parameters and calculate the values of the basic parameters and their corresponding preset threshold ranges. For example, perform pile penetration depth calculations. After calculation, the penetration depth of "Nanhai No. 1" into the mud is 6.5 meters, that of "Bohai No. 12" is 12.3 meters, that of the HYSY92 series is 8.9 meters, that of "Bohai No. 10" into the mud is 9.5 meters, that of "Bohai No. 4" into the mud is 10.8 meters, that of HYSY932 into the mud is 11.3 meters, and that of HYSY941 into the mud is 12.2 meters. Table 1 also lists the values of some parameters.

[0101] Table 1 Vertical Ship Selection Parameter Table

[0102]

[0103] Then, perform water depth matching, and all seven drilling ships meet the requirements. For the predicted pile penetration depth and the maximum allowable value of the pile penetration depth, "Nanhai No. 1", "Bohai No. 12", the HYSY92 series, and "Bohai No. 4" meet the matching requirements for the pile penetration depth into the mud. "Nanhai No. 1" and the HYSY92 series meet the matching requirements for the jack-up air gap. Referring to Table 2, it can be seen that "Nanhai No. 1" and HYSY922 meet the matching requirements for the covered area of the rotary table center. Through Figure 4 the data, it can be known that when the cantilever beam (rotary table center) moves horizontally and vertically, the load at the rotary table center is different at different positions. For example, if it needs to move 12 meters longitudinally and 3 meters horizontally to cover a certain well, the corresponding load at this position can be read from the load table. If the load required for drilling operations is greater than the load that the drilling ship can provide at this position, then the load of this well does not match. Determine the loads within the coverage ranges of "Nanhai No. 1" and HYSY922. Within the longitudinal coverage range of 16.8 meters and the horizontal coverage range of 3.0 meters, the drilling loads that can be provided are both above 900t. Therefore, both "Nanhai No. 1" and HYSY922 meet the matching requirements for the drilling load.

[0104] Table 2 Horizontal Space Coverage Range

[0105]

[0106] Combined with Figure 6It can be seen that since the overlapping area between the current positioning drilling ship (circular footprint) and the pentagonal old footprint is large, it is more likely to slip away from the production platform, which may lead to incomplete coverage. If the overlapping area of the square footprint (assuming the square footprint is similar in size to the pentagonal old footprint and the circular footprint) is large, the drilling ship may slip towards the production platform, which may cause the drilling ship to collide with the platform and affect the safety of large offshore facilities. Both the "Nanhai No. 1" and the HYSY922 have overlapping situations with the old footprints (A and B), and the overlapping areas are not much different.

[0107] The penetration depth of the pile into the mud is determined according to the penetration depth curve graph. Hereinafter, the curve graph with piercing risk ( Figure 8 ) and the curve graph without piercing risk ( Figure 7 ) will be respectively illustrated by examples. Figure 7 It is the relationship curve between the ultimate pile shoe load and the penetration depth of the pile shoe tip into the mud. The abscissa represents the ultimate pile shoe load, with the unit of MN; the ordinate represents the penetration depth of the pile shoe tip below the seabed mud surface, with the unit of m. The straight line S1 with an arrow in the figure is: the starting point of the arrow is the maximum preloading load of the drilling ship, with the unit of MN, and the side of the arrow is the penetration depth, that is, the value corresponding to the longitudinal coordinate. Figure 7 In [figure name], the right histogram is the histogram of soil composition. In the figure, it is silty clay - silt - silty clay - fine sand in sequence. Figure 8 The coordinate meaning of [figure name] is the same as that of Figure 7 . It can be seen from the penetration depth curve of the pile into the mud in Figure 8 that when it cannot stand on the first step surface and enters the second step surface, with a hard soil layer above and a soft soil layer below, piercing is very likely to occur, resulting in the tilting or even capsizing of the hull. If piercing risk is found, the drilling ship is not suitable for pile insertion and positioning at the production platform. In this embodiment, neither of the two drilling ships has piercing risk.

[0108] In summary, the selected ships are the "Nanhai No. 1" and the HYSY922 drilling ships. Due to the operation sequence of the drilling ships, only the "Nanhai No. 1" has a schedule in the South China Sea. Therefore, the final selected ship is the "Nanhai No. 1".

[0109] In summary, this embodiment has established a new modular ship selection method, breaking through the limitations of manual ship selection; improving the ship selection efficiency and accuracy, making the drilling ship more matched and scientific with the production platform; considering the pile insertion slip and pile insertion piercing situations, ensuring the safety of pile insertion, avoiding the collision between the drilling platform and the production platform, and ensuring the positioning safety and the safety of large facilities.

[0110] As Figure 9 shown, this embodiment provides a ship selection device for offshore oilfield positioning operations, including:

[0111] An acquisition module 81, configured to acquire basic parameter information, where the basic parameter information includes the basic parameter information of multiple to-be-determined drilling ships and the basic parameter information of the target operation location;

[0112] A determination module 82, configured to determine the value of each first preferred parameter in the first set of preferred parameters corresponding to each to-be-determined drilling vessel according to the basic parameter information, and the first preset threshold range corresponding to each first preferred parameter; wherein, the first preferred parameters include water depth at the operation location, pile penetration depth into the mud, maximum allowable value of the lifting air gap, coverage area of the rotary table center, and drilling load;

[0113] A first judgment module 83, configured to sequentially judge whether the value of each first preferred parameter in the first set of preferred parameters corresponding to each to-be-determined drilling vessel satisfies the first preset threshold range in a preset order;

[0114] If not, the process ends;

[0115] If so, determine the value of each second preferred parameter in the second set of preferred parameters corresponding to each to-be-determined drilling vessel according to the basic parameter information, and the second preset threshold range corresponding to each second preferred parameter; wherein, the second preferred parameters include pile anti-slip rate and pile anti-puncture rate;

[0116] A second judgment module 84, configured to sequentially judge whether the value of each second preferred parameter in the second set of preferred parameters corresponding to each to-be-determined drilling vessel satisfies the second preset threshold range in a preset order;

[0117] If not, the process ends;

[0118] If so, output the name of the corresponding to-be-determined drilling vessel as a result;

[0119] Wherein, both the first set of preferred parameters and the second set of preferred parameters include operation location preferred parameters determined according to the basic parameter information of the target operation location and drilling vessel preferred parameters of multiple to-be-determined drilling vessels determined according to the basic parameter information of multiple to-be-determined drilling vessels; both the first preset threshold range and the second preset threshold range include operation location parameter threshold ranges determined according to the basic parameter information of the target operation location and drilling vessel parameter threshold ranges of multiple to-be-determined drilling vessels determined according to the basic parameter information of multiple to-be-determined drilling vessels.

[0120] The device provided by the embodiment of the present invention, its implementation principle and the technical effects generated are the same as those of the foregoing method embodiment. For the sake of brief description, for the parts not mentioned in the device embodiment, reference may be made to the corresponding content in the foregoing method embodiment. The offshore oilfield positioning operation vessel selection device provided by the embodiment of the present invention has the same technical features as the offshore oilfield positioning operation vessel selection method provided by the above embodiment, so it can also solve the same technical problems and achieve the same technical effects.

[0121] Finally, it should be noted that the above-described embodiments are only specific embodiments of the present invention, used to illustrate the technical solutions of the present invention, rather than limiting it. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that any person skilled in the art within the technical scope disclosed by the present invention can still modify the technical solutions described in the foregoing embodiments, or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A method for selecting a ship for an offshore oilfield positioning operation, characterized in that, Including: Obtaining basic parameter information, where the basic parameter information includes the basic parameter information of multiple to-be-determined drilling vessels and the basic parameter information of the target operation location; Determining the value of each first preferred parameter in the first set of preferred parameters corresponding to each to-be-determined drilling vessel according to the basic parameter information, and the first preset threshold range corresponding to each first preferred parameter; wherein, the first preferred parameters include the water depth at the operation site, the penetration depth into the mud, the maximum allowable value of the lifting air gap, the covered area of the rotary table center, and the drilling load; Sequentially determining whether the value of each first preferred parameter in the first set of preferred parameters corresponding to each to-be-determined drilling vessel satisfies the first preset threshold range in a preset order; If not, the process ends; If so, determining the value of each second preferred parameter in the second set of preferred parameters corresponding to each to-be-determined drilling vessel according to the basic parameter information, and the second preset threshold range corresponding to each second preferred parameter; wherein, the second preferred parameters include the anti-slip rate of pile insertion and the anti-puncture rate of pile insertion; wherein, the basic parameter information of the to-be-determined drilling vessel includes the overlapping area between the drilling vessel and the old footprint, and the value of the anti-slip rate of pile insertion is determined according to the overlapping area between the drilling vessel and the old footprint; the basic parameter information of the to-be-determined drilling vessel also includes the unit pressure of the drilling vessel, and the value of the anti-puncture rate of pile insertion is determined according to the unit pressure of the drilling vessel; Sequentially determining whether the value of each second preferred parameter in the second set of preferred parameters corresponding to each to-be-determined drilling vessel satisfies the second preset threshold range in a preset order; If not, the process ends; If so, outputting the name of the corresponding to-be-determined drilling vessel as the result; Wherein, both the first set of preferred parameters and the second set of preferred parameters include the operation location preferred parameters determined according to the basic parameter information of the target operation location and the drilling vessel preferred parameters of multiple to-be-determined drilling vessels determined according to the basic parameter information of multiple to-be-determined drilling vessels; both the first preset threshold range and the second preset threshold range include the operation location parameter threshold range determined according to the basic parameter information of the target operation location and the drilling vessel parameter threshold range of multiple to-be-determined drilling vessels determined according to the basic parameter information of multiple to-be-determined drilling vessels.

2. The method for selecting a ship for the in-position operation of an offshore oilfield according to claim 1, characterized in that, The basic parameter information of the to-be-determined drilling vessel also includes the full-load draft value of the drilling vessel, the total length of the drilling vessel's leg, the maximum allowable value of the penetration depth, the maximum allowable value of the lifting air gap of the drilling vessel, and the reserved length of the leg; the first preset threshold range corresponding to the water depth at the operation site is: The minimum allowable value of the operation water depth > the full-load draft of the drilling vessel, and, The maximum allowable value of the operation water depth ≤ the total length of the drilling vessel's leg - (the maximum allowable value of the penetration depth + the maximum allowable value of the lifting air gap of the drilling vessel + the reserved length of the leg).

3. The method for selecting a ship for the in-position operation of an offshore oilfield according to claim 2, wherein The basic parameter information of the to-be-determined drilling vessel also includes the minimum allowable value of the penetration depth, and the first preset threshold range corresponding to the penetration depth into the mud is: The minimum allowable value of the penetration depth ≤ the penetration depth into the mud ≤ the maximum allowable value of the penetration depth, Wherein, the penetration depth into the mud is determined according to the penetration depth curve; the minimum allowable value of the penetration depth is determined according to the height value from the tip of the drilling vessel's leg to the maximum cross-sectional area of the pile shoe.

4. The method for selecting a ship for the in-position operation of an offshore oilfield according to claim 2, wherein The first preset threshold range corresponding to the maximum allowable value of the lifting air gap is: The maximum allowable value of the jacking air gap ≤ the total length of the jack-up legs - (the maximum allowable value of the operating water depth + the maximum allowable value of the penetration depth + the reserved length of the jack-up legs).

5. The method for selecting a ship for the positioning operation of an offshore oilfield according to claim 1, characterized in that, The basic parameter information of the target operating location includes the wellhead area of the production platform. The first preset threshold range corresponding to the covered area of the rotary table center is: the covered area of the rotary table center covers the wellhead area of the production platform.

6. The method for selecting a ship for the in-position operation of an offshore oilfield according to claim 1, wherein The basic parameter information of the to-be-determined jack-up includes the lateral displacement of the rotary table center and the longitudinal displacement of the rotary table center. The first preset threshold range corresponding to the drilling load is: the drilling load > the load required for wellhead operation, where the load required for wellhead operation is determined according to the lateral displacement of the rotary table center and the longitudinal displacement of the rotary table center.

7. The method for selecting a ship for the in-position operation of an offshore oilfield according to claim 1, wherein The basic parameter information of the to-be-determined jack-up further includes the height from the sea level at high tide to the seabed. The first preset threshold range corresponding to the water depth at the operation location is: The water depth at the operation location < the height from the sea level at high tide to the seabed.

8. An offshore oilfield positioning operation ship selection device, characterized in that, including: An acquisition module for acquiring basic parameter information, where the basic parameter information includes the basic parameter information of multiple to-be-determined jack-ups and the basic parameter information of the target operating location; A determination module for determining the value of each first preferred parameter in the first set of preferred parameters corresponding to each to-be-determined jack-up according to the basic parameter information, and the first preset threshold range corresponding to each first preferred parameter; where the first preferred parameters include the water depth at the operation location, the penetration depth into the mud, the maximum allowable value of the jacking air gap, the covered area of the rotary table center, and the drilling load; A first judgment module for sequentially judging whether the value of each first preferred parameter in the first set of preferred parameters corresponding to each to-be-determined jack-up meets the first preset threshold range in a preset order; If not, the process ends; If so, determine the value of each second preferred parameter in the second set of preferred parameters corresponding to each to-be-determined jack-up according to the basic parameter information, and the second preset threshold range corresponding to each second preferred parameter; where the second preferred parameters include the anti-slip rate of pile penetration and the anti-puncture rate of pile penetration; where the basic parameter information of the to-be-determined jack-up includes the overlapping area between the jack-up and the old footprint, and the value of the anti-slip rate of pile penetration is determined according to the overlapping area between the jack-up and the old footprint; the basic parameter information of the to-be-determined jack-up further includes the unit pressure of the jack-up, and the value of the anti-puncture rate of pile penetration is determined according to the unit pressure of the jack-up; A second judgment module for sequentially judging whether the value of each second preferred parameter in the second set of preferred parameters corresponding to each to-be-determined jack-up meets the second preset threshold range in a preset order; If not, the process ends; If so, output the corresponding to-be-determined jack-up name as the result; Wherein, both the first set of preferred parameters and the second set of preferred parameters include the operation location preferred parameters determined according to the basic parameter information of the target operating location and the jack-up preferred parameters of multiple to-be-determined jack-ups determined according to the basic parameter information of multiple to-be-determined jack-ups; both the first preset threshold range and the second preset threshold range include the operation location parameter threshold range determined according to the basic parameter information of the target operating location and the jack-up parameter threshold range of multiple to-be-determined jack-ups determined according to the basic parameter information of multiple to-be-determined jack-ups.

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