A method and system for drilling and completion operations on a floating production platform with a rig module

Abstract

The present application relates to a kind of floating production platform drilling and completion operation method and system with rig module, it includes: in the platform original point and goes into drilling riser and production riser;After the platform displacement is realized by anchor chain, drilling riser, production riser and underwater wellhead are connected again, to reduce the interference risk of going into process.The present application can greatly reduce drilling and completion and workover cost, underwater Christmas tree cost, effectively revitalizes marginal oil and gas field development.The present application can be widely applied in offshore oil and gas field development field.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore oil and gas field development, and in particular to a method and system for drilling and completing a well on a floating production platform with a drilling rig module. Background Art

[0002] As oil and gas exploration and development gradually move toward deepwater and ultra-deepwater formations, conventional deepwater oil and gas fields are drilled using semi-submersible rigs, with production using subsea wellheads and Christmas trees. Oil and gas are then transported to floating production platforms via SCR for oil, gas, and water treatment and storage, or via submarine pipelines to shallow-water platforms for oil, gas, and water treatment. This deepwater development model requires the use of semi-submersible rigs, deepwater floating platforms, and the installation of subsea wellheads and Christmas trees. This leads to high overall development costs and demands high reservoir characteristics and production rates. In recent years, domestic deepwater exploration has continuously discovered marginal oil fields. Conventional deepwater oil and gas field development models are unable to achieve economic production targets, limiting the development of these marginal fields. Furthermore, conventional deepwater development models are costly. Summary of the Invention

[0003] In response to the above problems, the purpose of the present invention is to provide a method and system for drilling and completion operations on a floating production platform with a drilling rig module, which can significantly reduce the costs of drilling, completion and well repair, as well as the costs of underwater oil trees, and effectively revitalize the development of marginal oil and gas fields.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a method for drilling and completion operations on a floating production platform equipped with a drilling rig module, comprising: running a drilling riser and a production riser at the platform origin; after the platform is displaced by anchor chains, connecting the drilling riser and production riser to the underwater wellhead to reduce the risk of interference during the running process.

[0005] Furthermore, during the drilling operation on the drilling riser and the completion and workover operation on the production riser, it also includes:

[0006] The platform is shifted by anchor chains to ensure that the drilling rig, platform well slot, underwater wellhead are in a straight line during drilling, completion and workover operations, and the drilling riser and production riser are in a straight line.

[0007] Furthermore, drilling risers and production risers are run at the platform origin, including:

[0008] The semi-submersible drilling platform / floating production platform pre-drills the shallow layer, sequentially runs the low-pressure wellhead and casing, drills the wellbore, runs the casing and high-pressure wellhead, and completes all well surface operations in batch drilling;

[0009] When working in the first well, a drilling riser needs to be lowered.

[0010] Further, after the platform is moved by the anchor chain, the drilling riser, the production riser and the underwater wellhead are connected, including:

[0011] The floating production platform is moved to the first preset position at the center of the underwater wellhead by the anchor chain, the water BOP is installed, and pressure test is performed;

[0012] The lower section of the well is drilled to 12-1 / 4 inch casing, the 9-5 / 8 inch production casing is lowered, and the well is cemented;

[0013] The 8-1 / 2 inch well section is drilled, the well is temporarily abandoned, and the drilling riser is released at the underwater wellhead position;

[0014] The SPAR platform is moved to the second preset position of the next well by the anchor chain, and the drilling riser and the BOP are connected at the second preset position of the underwater wellhead;

[0015] The drilling rig is moved to the production riser well slot by the anchor chain, and the SPAR platform is moved back to the center position, and the production riser is lowered;

[0016] The platform is moved to the first preset position of the well, the production riser is connected at the underwater wellhead, and the BOP is installed, and pressure test is performed.

[0017] Further, after the BOP is installed and pressure test is performed, it further includes:

[0018] The bridge plug is drilled, the well is washed, the wellbore is replaced with completion fluid, and well cementing quality testing, perforation, tubing lowering, and BOP disassembly are performed in sequence;

[0019] After the production tree is installed and pressure test is performed, the production tree nozzle hose is installed, the induced flow production is started, and the drilling operation is completed.

[0020] Further, the well slots of the deepwater floating platform are arranged in a centralized manner, and the well slot spacing is determined according to the size of the production tree and the installation requirements of the post-nozzle hose.

[0021] Further, the drilling rig module includes a set of drilling rig DES and ESD modules with a drill pipe heave compensation system, a high-pressure riser and a tensioner system, and a water BOP stack; the pressure rating of the high-pressure riser and the water BOP stack is determined according to the formation pressure, and the size of the high-pressure riser is determined according to the drilling process and the riser strength check.

[0022] A floating production platform drilling and completion operation system with a drilling rig module, comprising: a riser installation module for lowering the drilling riser and the production riser at the original point of the platform; a moving connection module for connecting the drilling riser, the production riser and the underwater wellhead after the platform is moved by the anchor chain, so as to reduce the interference risk during the lowering process.

[0023] Further, during the drilling operation of the drilling riser and the completion and workover operation of the production riser, it further includes:

[0024] The platform is displaced by the anchor chain, so that the drilling rig, the platform well slot, the underwater wellhead are in a straight line state during drilling, completion and workover, and the drilling riser and the production riser are in a straight line state.

[0025] Further, after the platform is displaced by the anchor chain, the drilling riser and the production riser are connected with the underwater wellhead, including:

[0026] The SPAR platform is moved to the first preset position at the center of the underwater wellhead by the anchor chain, the topside BOP is installed, and pressure test is performed;

[0027] The lower section of the well is drilled to 12-1 / 4in casing, the 9-5 / 8in production casing is lowered, and the well is cemented;

[0028] The well is drilled to 8-1 / 2in, the well is temporarily abandoned, and the drilling riser is released at the underwater wellhead position;

[0029] The SPAR platform is moved to the second preset position of the next well by the anchor chain, and the drilling riser and the BOP are connected at the second preset position of the underwater wellhead;

[0030] The drilling rig is moved to the production riser well slot by the anchor chain, and the SPAR platform is moved back to the center position, and the production riser is lowered;

[0031] The platform is moved to the first preset position of the well, the production riser is connected with the underwater wellhead, and the BOP is installed, and pressure test is performed.

[0032] The present application has the following advantages due to the above technical scheme:

[0033] The present application uses the drilling rig module on the floating production platform to perform drilling, completion and workover, which greatly reduces the drilling and completion and workover cost, the underwater Christmas tree cost, and effectively revitalizes the marginal oil and gas field development. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is the flow chart of the drilling and completion operation method of the floating production platform with the drilling rig module in the embodiment of the present application;

[0035] Figure 2 is a schematic view of the floating production platform located at the origin in the embodiment of the present application;

[0036] Figure 3 is a schematic view of the floating production platform displaced to the A1 position for drilling operation in the embodiment of the present application;

[0037] Figure 4 is a schematic view of the platform moved to the A2 position to hang the drilling riser in the embodiment of the present application;

[0038] Figure 5 is a schematic diagram of installing a production riser to perform a well completion operation in an embodiment of the present application. DETAILED DESCRIPTION

[0039] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be described clearly and completely below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the described embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art belong to the scope of protection of the present application.

[0040] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a presence of a feature, step, operation, device, component and / or a combination thereof.

[0041] The main high costs in the conventional deepwater development mode are: the cost of using a semi-submersible drilling platform to perform drilling and completion operations, the cost of a deepwater subsea wellhead and Christmas tree, and the cost of a floating production platform storage or long-distance marine pipeline. The present application solves the problem of high cost of semi-submersible drilling platforms for drilling, deepwater subsea wellheads and Christmas trees by adding a storage device, a drilling rig module, a dry Christmas tree module, etc. on the floating platform, thereby greatly reducing the development cost of deepwater marginal oil and gas fields.

[0042] In an embodiment of the present application, as shown in Figure 1 a method for drilling and completion operations of a floating production platform with a drilling rig module is provided. In this embodiment, the deepwater floating platform uses a shift drilling mode to perform drilling, which can realize simultaneous drilling and production, and achieve the purpose of early production. The method comprises the following steps:

[0043] 1) Lowering a drilling riser and a production riser at the original point of the platform;

[0044] 2) After the platform is shifted by anchor chains, connecting the drilling riser, the production riser and the subsea wellhead to reduce the risk of interference during the lowering process.

[0045] In the above embodiment, during the drilling operation of the drilling riser and the completion and workover operations of the production riser, the platform is shifted by anchor chains to ensure that the drilling rig, the platform well slot and the subsea wellhead are in a straight line state, and the drilling riser and the production riser are in a straight line state during the drilling operation, the completion operation and the workover operation.

[0046] In step 1) above, the drilling riser and the production riser are lowered into the well at the platform origin, including the following steps:

[0047] 1.1) The submersible drilling platform / SPAR pre-drills a shallow well, sequentially lowers a low-pressure wellhead, a conductor, drills a wellbore, lowers a casing, and a high-pressure wellhead, and completes all well surface layer operations in batch drilling;

[0048] In this embodiment, the outer diameter of the conductor is 30 inches, the wellbore is 26 inches, and the casing is a 20+13-3 / 8 inch surface casing.

[0049] 1.2) When working in the first well, the drilling riser needs to be lowered;

[0050] The outer diameter of the drilling riser in this embodiment is 16 inches.

[0051] In step 2) above, after the platform is moved by anchor chains, the drilling riser, the production riser, and the underwater wellhead are connected, including the following steps:

[0052] 2.1) The platform is moved to the first predetermined position A1 at the center of the underwater wellhead by anchor chains, a 13-5 / 8 inch water BOP is installed, and pressure testing is performed;

[0053] 2.2) A 12-1 / 4 inch casing lower well section is drilled, a 9-5 / 8 inch production casing is lowered, and cementing is performed;

[0054] 2.3) An 8-1 / 2 inch well section is drilled, the well is temporarily abandoned, and the drilling riser is released at the underwater wellhead position, as shown in Figure 2 ;

[0055] 2.4) The platform is moved to the second predetermined position A2 of the next well by anchor chains, and the drilling riser and the 13-5 / 8 inch BOP are connected at the underwater wellhead at the second predetermined position A2, as shown in Figure 3 ;

[0056] 2.5) The drilling rig is moved to the production riser well slot by anchor chains, and the SPAR platform is moved back to the center position, and the production riser is lowered, as shown in Figure 4 ;

[0057] In this embodiment, the production riser is 10-3 / 4 inches.

[0058] 2.6) The platform is moved to the first predetermined position A1 well position, the production riser is connected at the underwater wellhead, and a 13-5 / 8 inch BOP is installed, and pressure testing is performed;

[0059] 2.7) The bridge plug is drilled, the well is washed, the wellbore is replaced with completion fluid, and cementing quality testing, perforation, tubing lowering, and 13-5 / 8 inch BOP disassembly are sequentially performed;

[0060] 2.8) After installation of the Christmas tree and pressure testing, install the tree hose, induce flow, complete the drilling operation, and move to the next well drilling operation, as shown in Figure 5

[0061] In the above embodiments, the drilling module of the deepwater floating platform includes a set of drilling rig (DES and ESD) module with a drilling string heave compensation system, a high-pressure riser and a tensioner system, and a surface blowout preventer group. The pressure rating of the high-pressure riser and the surface blowout preventer group is determined according to the formation pressure, and the size of the high-pressure riser is determined according to the drilling process and the riser strength check.

[0062] In the above embodiments, the well slots of the deepwater floating platform are arranged in a centralized manner, and the well slot spacing is determined according to the size of the Christmas tree and the installation requirements of the tree hose. The main consideration is the interference between the drilling riser and the production riser, and the underwater wellheads are arranged in a dispersed manner, which can be circular or double-row arrangement. The well slot spacing of the underwater wellhead needs to be determined through the interference analysis between the drilling riser and the production riser, and the production riser according to the drilling and completion operation procedure.

[0063] In summary, by using the drilling module on the floating production platform for drilling, completion and workover operations, the drilling and completion and workover costs, as well as the underwater Christmas tree costs, are greatly reduced, and the development of marginal oil and gas fields is effectively revitalized.

[0064] In one embodiment of the present application, a floating production platform drilling and completion operation system with a drilling module is provided, which includes:

[0065] A riser installation module for lowering the drilling riser and the production riser at the platform origin;

[0066] A mobile connection module for connecting the drilling riser, the production riser and the underwater wellhead after the platform is moved by anchor chain, so as to reduce the interference risk in the lowering process.

[0067] In the above embodiment, during the drilling operation of the drilling riser and the completion and workover operation of the production riser, it further includes:

[0068] The platform is moved by anchor chain to ensure that the drilling rig, the platform well slot and the underwater wellhead are in a straight line state during the drilling operation, the completion operation and the workover operation, and the drilling riser and the production riser are in a straight line state.

[0069] In the above embodiment, the drilling riser and the production riser are lowered at the platform origin, which includes:

[0070] The submersible drilling platform / SPAR pre-drills shallow layers, and sequentially lowers the low-pressure wellhead, the guide pipe, drills the borehole, lowers the casing and the high-pressure wellhead, and completes all well surface layer operations in batches;

[0071] ​When operating in the first well, the drilling riser needs to be lowered.

[0072] In the above embodiment, after the platform is moved by the anchor chain, the drilling riser, the production riser and the underwater wellhead are connected, including:

[0073] The SPAR platform is moved to the first preset position at the center of the underwater wellhead by the anchor chain, the topside BOP is installed, and pressure test is performed.

[0074] The lower section of the well is drilled to 12-1 / 4in casing, the 9-5 / 8in production casing is lowered, and the well is cemented.

[0075] The 8-1 / 2in well section is drilled, the well is temporarily abandoned, and the drilling riser is released at the underwater wellhead position.

[0076] The SPAR platform is moved to the second preset position of the next well by the anchor chain, and the drilling riser and the BOP are connected at the underwater wellhead at the second preset position.

[0077] The drilling rig is moved to the production riser well slot by the anchor chain, and the SPAR platform is moved back to the center position, and the production riser is lowered.

[0078] The platform is moved to the first preset position well position, the production riser is connected at the underwater wellhead, and the BOP is installed, and pressure test is performed.

[0079] In the above embodiment, after the BOP is installed and pressure test is performed, it further includes:

[0080] The bridge plug is drilled, the well is washed, the wellbore is replaced with completion fluid, and well cementing quality testing, perforation, tubing lowering and BOP disassembly are performed in sequence.

[0081] After the production tree is installed and pressure test is performed, the production tree nozzle hose is installed, the induced flow production is started, and the drilling operation is completed.

[0082] The well slots of the deepwater floating platform are arranged in a centralized manner, and the well slot spacing is determined according to the size of the production tree and the installation requirements of the post-nozzle hose.

[0083] In the above embodiment, the drilling rig module includes a set of drilling rig DES and ESD modules with a drill pipe heave compensation system, a high-pressure riser and a tensioner system, and a topside blowout preventer group. The pressure rating of the high-pressure riser and the topside blowout preventer group is determined according to the formation pressure, and the size of the high-pressure riser is determined according to the drilling process and the riser strength check.

[0084] The system provided in the above embodiment is used to execute the above method embodiments, and the specific process and detailed content are described above and will not be repeated here.

[0085] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the same; and although the present application has been described in detail with reference to the foregoing embodiments, it should be appreciated by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features thereof can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for drilling and completing a well on a floating production platform with a drilling rig module, characterized in that: The deepwater floating platform uses a shift drilling mode to drill wells, which can achieve simultaneous drilling and production, and achieve early production. This operation method includes: Run the drilling riser and production riser at the platform origin; After the platform is shifted by the anchor chain, the drilling riser, production riser and underwater wellhead are connected to reduce the risk of interference during the running process; During drilling operations on drilling risers and completion and workover operations on production risers, this also includes: The platform is shifted by anchor chains to ensure that the drilling rig, platform well slot, underwater wellhead, drilling riser and production riser are in a straight line during drilling, completion and workover operations; Running drilling risers and production risers at the platform origin includes: The semi-submersible drilling platform / floating production platform pre-drills the shallow layer, sequentially runs the low-pressure wellhead and casing, drills the wellbore, runs the casing and high-pressure wellhead, and completes all well surface operations in batch drilling; When working in the first well, the drilling riser needs to be lowered; After the platform is moved by the anchor chain, the drilling riser, production riser and underwater wellhead are connected, including: Move the floating production platform to the first preset position in the center of the underwater wellhead via anchor chains, install the surface BOP, and conduct pressure testing; Drill the lower section of the 12-1 / 4-inch casing, run the 9-5 / 8-inch production casing, and cement the well; Drill the 8-1 / 2-in. section, temporarily abandon the well, and release the drilling riser at the underwater wellhead; Move the SPAR platform to a second preset location for the next well using an anchor chain, and connect the drilling riser and BOP to the underwater wellhead at the second preset location; Move the drilling rig to the production riser slot using the anchor chain, move the SPAR platform back to the center position, and lower the production riser; Move the platform to the first preset position, connect the underwater wellhead to the production riser, install the BOP, and conduct a pressure test.

2. The method for drilling and completing a well on a floating production platform with a drilling rig module according to claim 1, wherein: After installing the BOP and performing pressure testing, the following procedures are also included: Drill out the bridge plug, clean the well, replace the completion fluid in the wellbore, and then perform cementing quality testing, perforation, tubing running, and BOP removal in sequence; After installing the Christmas tree and conducting a pressure test, the hose behind the Christmas tree nozzle is installed, the well is induced to start production, and the drilling operation is completed.

3. The method for drilling and completing a well on a floating production platform with a drilling rig module according to claim 2, wherein: The well slots of deepwater floating platforms are arranged in a centralized manner, and the spacing between the well slots is determined according to the size of the Christmas tree and the installation requirements of the hose behind the nozzle.

4. The method for drilling and completing a well on a floating production platform with a drilling rig module according to claim 1, wherein: The drilling rig module includes a set of drilling rig DES and ESD modules with a drill pipe heave compensation system, a high-pressure riser and tensioner system, and an above-water blowout preventer group. The pressure level of the high-pressure riser and the above-water blowout preventer group is determined according to the formation pressure conditions, and the size of the high-pressure riser is determined according to the drilling process and riser strength verification.

5. A floating production platform drilling and completion system with a drilling rig module, used to implement the floating production platform drilling and completion method with a drilling rig module as claimed in any one of claims 1 to 4, characterized in that: include: Riser installation module, which runs drilling risers and production risers at the platform origin; The mobile connection module uses anchor chains to shift the platform, and then connects the drilling riser, production riser and underwater wellhead to reduce the risk of interference during the lowering process.

6. The floating production platform drilling and completion system with a drilling rig module according to claim 5, characterized in that: During drilling operations on drilling risers and completion and workover operations on production risers, this also includes: The platform is shifted by anchor chains to ensure that the drilling rig, platform well slot, underwater wellhead are in a straight line during drilling operations, completion operations and workover operations, and the drilling riser and production riser are in a straight line.

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