A small-size casing internal closed-type suspended intelligent flow control water pipe column and its installation method

Abstract

This application discloses a small-sized, casing-in-closed, suspended intelligent flow control and water management string, comprising a tank body with an outer diameter less than 140 mm at its widest point. At least one end of the tank body is provided with a conversion joint. Control cables and a submersible electric pump unit are housed within the tank body. At least one annular groove is provided on the outer wall of the tank body. Rectangular locking teeth are respectively formed at both ends of the annular groove. A pipeline protection device is fitted onto the outer wall of the tank body, and the pipeline protection device is disposed within the annular groove, engaging with the rectangular locking teeth. This application also provides an installation method for the small-sized, casing-in-closed, suspended intelligent flow control and water management string. The intelligent flow control and water management string of this application has a simple structure, is easy to source and process, has low cost, a simple installation method, and is quick and convenient for on-site operation. It has good application prospects and can be widely used in the intelligent development of small-volume offshore oilfields.

Description

Technical Field

[0001] This application relates to the field of drilling and completion technology in oil exploration and development, and in particular to a small-sized casing-closed suspended intelligent flow control and water control string, and its installation method. Background Technology

[0002] Currently, tank-type pump systems are widely used offshore and are technologically mature. They mainly include two types of products: 9.625-inch and 7-inch casing-type systems. The tank-type pump system includes: the tank body, lifting connector, electric pump docking suspension device, submersible pump unit, fixing cap, conversion sub, bottom connector, and external tank protector. Starting in October 2023, intelligent segmented flow control and water control well completion technology was gradually promoted in the eastern South China Sea. Because the production fluid volume in eastern oilfields is generally large (2000-3000 cubic meters / day), the implementation of this technology requires the use of a tank-type pump system to ensure the suspension of the lower intelligent segmented flow control tubing string and the protection of the control pipelines.

[0003] The external dimensions of the filling pump system's tank are relatively large due to the need for cable protection clips. A standard 7.625-inch filling pump system, once installed, has an overall outer diameter of 214-216 mm. A standard 5.5-inch filling pump system has an outer diameter of 155-156 mm, while the 7-inch casing has an inner diameter of 157 mm. This insufficient clearance poses a high risk of obstruction when the tubing, combined with the intelligent segmented flow control technology, is lowered into the casing. The control lines cannot be protected, reducing the overall quality of the installation. Currently, the filling system can only be installed within a 9.625-inch casing, which does not meet the requirements for implementing segmented flow control technology within a 7-inch casing.

[0004] Therefore, given the existing technical deficiencies, in order to meet the drilling and completion requirements of oilfield development where electric pumps are typically installed within 7-inch casings, it is necessary to develop a small-sized, closed-loop, intelligent flow control and water management string and its installation method. Summary of the Invention

[0005] To address one of the technical problems existing in the prior art, this application provides a small-sized sleeve-type closed-type suspended intelligent flow control water pipe column and its installation method.

[0006] According to some embodiments of this application, a small-sized sleeve-type closed-loop intelligent flow control water pipe column is provided, including a tank body. The outer diameter of the widest part of the tank body is less than 140mm. At least one end of the tank body is provided with a conversion joint. The tank body is provided with control cables and a submersible electric pump unit. The outer wall of the tank body is provided with at least one annular groove. The tank body is provided with rectangular locking teeth at both ends of the annular groove. The outer wall of the tank body is fitted with a pipeline protection device, and the pipeline protection device is disposed in the annular groove. The pipeline protection device and the rectangular locking teeth cooperate with each other.

[0007] In some embodiments, the outer diameter of the tank is between 135mm and 140mm.

[0008] In some embodiments, after the pipeline protection device is installed, the maximum outer diameter of the tank and the pipeline protection device is less than 152 mm.

[0009] In some embodiments, the length of the tank is 5m or 8m.

[0010] In some embodiments, the adapter is a conversion coupling between the tank and the oil pipe.

[0011] In some embodiments, the tank is connected to a suspension assembly via the adapter.

[0012] In some embodiments, the control cable is a plastic-encapsulated all-in-one cable.

[0013] In some embodiments, the submersible electric pump unit is a small-sized submersible electric pump unit, which is suspended inside the tank.

[0014] In some embodiments, the tank body is provided with a protective stub.

[0015] In addition, this application also provides an installation method for a small-sized, sleeve-type closed-loop intelligent flow control water pipe column, including the following steps:

[0016] Step 1: For the well section that needs to be completed, select the corresponding closed-loop suspension protection system based on reservoir characteristics, well structure design, mud layer conditions and production data, and determine the combination of hydraulic / electric control type or combined type intelligent flow control tubing string through calculation;

[0017] Step 2: Based on the scheme determined in Step 1, select a suitable small-sized sleeve-type closed-loop intelligent flow control pipe column. The small-sized sleeve-type closed-loop intelligent flow control pipe column is the aforementioned small-sized sleeve-type closed-loop intelligent flow control pipe column.

[0018] Step 3: Lower the intelligent flow regulation and water control inner tubing string, install the closed suspension protection system, and perform outer diameter measurement of the protection system and signal testing of the downhole intelligent flow regulation device;

[0019] Step 4: Based on the precise position of the segmented intelligent flow control tubing string and the tubing string length, sequentially lower the production annulus packer and tubing hanger, and fabricate control cables to pass through them. Lower the tubing string into place, complete the predetermined segmentation, set the packer, and install the wellhead and production process.

[0020] The beneficial effects of this application are as follows: This application discloses a small-sized casing-in-closed suspended intelligent flow control and water control string. Through the cooperation of a pipeline protection device and rectangular locking teeth, the outer diameter of the tank is reduced, thus allowing the maximum outer diameter of the tank to meet the requirements of a small size. This enables the combined application of a closed-loop upper production string and a hydraulic / electro-controlled lower intelligent flow control and water control string within a 7-inch casing, solving the current problem of incompatibility between electric pump production and intelligent flow control and water control in small-sized casing drilling and completion operations in offshore oil and gas field development. Furthermore, the installation method of the small-sized casing-in-closed suspended intelligent flow control and water control string in this application can also meet the intelligent water control completion requirements of small wells with 7-inch casing and 6-inch horizontal open holes, achieving intelligent injection and production monitoring and control. Simultaneously, through precise stratification and control, an effective displacement system is established, improving development efficiency. The intelligent flow control and water control string of this application has a simplified structure, is easy to source and process, has low cost, a simple installation method, and is quick and convenient to operate on-site. It has good application prospects and can be widely used in the intelligent development of small-volume offshore oil fields.

[0021] Other features and advantages of this application will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the description, claims and drawings. Attached Figure Description

[0022] To more clearly illustrate the technical solution of this application, the following description will be provided in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of this application and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings:

[0023] Figure 1 This is a structural schematic diagram of the small-sized sleeve-type closed-type suspended intelligent flow control water pipe column provided in this application;

[0024] Figure 2 yes Figure 1 A sectional view;

[0025] Figure 3 This is a schematic diagram of the installation method of the small-sized sleeve-type closed-type suspended intelligent flow control water pipe column provided in this application. Detailed Implementation

[0026] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0027] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0028] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0029] The following is in conjunction with the appendix Figures 1 to 3 The provided embodiments further illustrate the small-sized sleeve-type closed-type suspended intelligent flow control water pipe column and its installation method proposed in this application.

[0030] like Figure 1 and Figure 2As shown, some embodiments of this application provide a small-sized sleeve-type closed-loop intelligent flow control water pipe column, including a tank 100, the outer diameter of the tank 100 being between 135mm and 140mm, and the outer diameter at the widest point of the tank 100 being less than 140mm. At least one end of the tank body 100 is provided with a conversion connector 200. The tank body 100 is provided with control cables and a submersible electric pump unit. The outer wall of the tank body 100 is provided with at least one annular groove. The tank body 100 is provided with rectangular locking teeth 110 at both ends of the annular groove. For example, 20 rectangular locking teeth 110 are provided at the end of the annular groove. The outer wall of the tank body 100 is fitted with a pipeline protection device 300, and the pipeline protection device 300 is located in the annular groove. The pipeline protection device 300 and the rectangular locking teeth 110 cooperate to ensure that after the pipeline protection device 300 is installed, the maximum outer diameter of the tank body 100 and the pipeline protection device 300 is less than 152 mm, so as to ensure that the tank body 100 can be used together in a 7-inch sleeve. This application discloses a small-sized casing-closed suspended intelligent flow control and water management string. Through the cooperation of the pipeline protection device 300 and the rectangular locking teeth 110, the outer diameter of the tank 100 is reduced, thereby enabling the maximum outer diameter of the tank 100 to meet the requirements of small size. It can realize the joint application of closed upper production string and hydraulic / electrically controlled lower intelligent flow control and water management string in 7-inch casing, solving the problem of incompatibility between electric pump production and intelligent flow control and water management in small-sized casing in drilling and completion operations in offshore oil and gas field development. Moreover, it has a simple structure, is easy to source and process, has low cost, simple installation method, and quick and convenient on-site operation. It has good application prospects and can be widely used in the intelligent development of small-volume offshore oil fields.

[0031] In some embodiments, as Figure 1 and Figure 2 As shown, the tank 100 has a length of 5m or 8m and comes in two specifications. The appropriate length of tank 100 can be selected according to actual needs.

[0032] In some embodiments, as Figure 1 and Figure 2 As shown, the adapter 200 is a conversion coupling between the tank 100 and the oil pipe, which can easily connect the tank 100 and the oil pipe.

[0033] In some embodiments, anti-rotation blocks are respectively provided at the upper and lower ends of the pipeline protection device 300 to achieve circumferential fixation of the pipeline protection device 300.

[0034] In some embodiments, as Figure 1 and Figure 2 As shown, the tank 100 is connected to the suspension assembly 400 via the adapter 200, which allows the tank 100 to be suspended inside the 7-inch sleeve.

[0035] In some embodiments, the control cable is a plastic-encapsulated all-in-one conduit. After being integrated, the cable structure can be optimized to reduce the volume occupied, and the cable breaking force is increased from 10KN to 20kN, thereby improving its tensile strength.

[0036] In some embodiments, the submersible electric pump unit is a small-sized submersible electric pump unit, which is suspended inside the tank 100.

[0037] In some embodiments, a protective section 500 is provided on the tank body 100.

[0038] In addition, such as Figure 3 As shown, this application also provides an installation method for a small-sized, sleeve-type closed-loop intelligent flow control water pipe column, including the following steps:

[0039] Step 1: For the well section that needs to be completed, select the corresponding closed-loop suspension protection system based on reservoir characteristics, well structure design, mud layer conditions and production data, and determine the combination of hydraulic / electric control type or combined type intelligent flow control tubing string through calculation;

[0040] Step 2: Based on the scheme determined in Step 1, select a suitable small-sized sleeve-type closed-loop intelligent flow control pipe column. The small-sized sleeve-type closed-loop intelligent flow control pipe column is the aforementioned small-sized sleeve-type closed-loop intelligent flow control pipe column.

[0041] Step 3: Lower the intelligent flow regulation and water control inner tubing string, install the closed suspension protection system, and perform outer diameter measurement of the protection system and signal testing of the downhole intelligent flow regulation device;

[0042] Step 4: Based on the precise position of the segmented intelligent flow control tubing string and the tubing string length, sequentially lower the production annulus packer and tubing hanger, and fabricate control cables to pass through them. Lower the tubing string into place, complete the predetermined segmentation, set the packer, and install the wellhead and production process.

[0043] In step 3 above, after the intelligent flow control and water regulation inner tubing is run in, a positioning bypass, insertion seal, electrical control distributor / hydraulic control distributor / wellbore pressure control distributor, production tubing and round plug are set inside the intelligent flow control and water regulation inner tubing. During this process, the tubing is run in at a constant speed and smoothly, and the downhole electrical signals and insulation conditions are monitored.

[0044] In step 4 above, after the tubing is lowered to the predetermined depth, the positioning seal for the tank and cable is inserted into the sealing cylinder of the top packer and sealing cylinder, and a certain tubing load is applied.

[0045] In step 4 above, after the tubing column is lowered into place, the insulation to ground and the phase-to-phase DC resistance of the motor cable are measured and recorded. The three-phase DC resistance imbalance is required to be <2%, and the insulation to ground is required to be greater than 2000MΩ / 1000V. After the measurement is completed, discharge is performed using professional equipment.

[0046] The following describes in detail, with reference to embodiments, an installation method for a small-sized sleeve-type closed-loop intelligent flow control water pipe column according to this application.

[0047] The significant differences in reservoir properties in a certain oilfield in the eastern South China Sea affect the balanced utilization of horizontal sections, resulting in inconsistent edge water advance rates at different well points. Intelligent segmented flow regulation and water control technology can mitigate the impact of these property differences on production. The following steps outline the installation method for a small-sized casing-closed suspended intelligent flow regulation and water control string:

[0048] S1. Based on reservoir characteristics, clay content, well structure and production data, the production string type is confirmed to be 7-inch closed-loop suspended electric pump production string + intelligent segmented flow control string.

[0049] S2. Based on the construction design plan, select and optimize the small-size casing-type closed-type suspended intelligent flow control water pipe string, including 5 tanks 100, 5 pipeline protection devices 300, control pipeline plastic seal, conversion joint 200, suspension assembly 400 and submersible electric pump unit.

[0050] S3. Run the intelligent flow control and water regulation inner tubing to the predetermined design depth, complete the pressure setting, and complete the three-stage mechanical packer of the section, including 1 top packer and 2 oil- and water-swellable packers; install the closed suspension protection system, measure the outer diameter of the protection system, and measure that the outer diameter of the 5 pipeline protection devices of the protection system is less than 152mm, which meets the design requirements. At the same time, conduct signal testing of the downhole intelligent flow control device.

[0051] S4. Based on the precise position of the segmented intelligent flow control water control external tubing string and the tubing string length, the production annulus packer and tubing hanger are sequentially lowered in, and control cables are made to pass through them. The tubing string is lowered into place, the predetermined segmentation is completed, the packer is set, and the wellhead and production process are installed.

[0052] Implementation Results: After 40 days of monitoring, the downhole closed-loop suspension protection system and the unit were well protected. Downhole sensor signals were normal, showing low vibration (0.2G) and no leakage current. The signals of the three downhole electronically controlled intelligent flow regulators were normal, with a cumulative oil production of 0.26 million cubic meters, exceeding the production target by 0.1 million cubic meters. The production system was efficiently adjusted after commissioning.

[0053] The installation method of the small-sized casing-in-closed-type suspended intelligent flow control tubing string in this application can meet the intelligent water control completion requirements of small wells with 7-inch casing and 6-inch horizontal open hole, realize intelligent injection and production monitoring and control, and establish an effective displacement system through fine stratification and control to improve development effect.

[0054] It is understood that the above embodiments only illustrate preferred embodiments of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this application. It should be noted that, for those skilled in the art, without departing from the concept of this application, the above technical features can be freely combined, and several modifications and improvements can be made, all of which fall within the protection scope of this application. Therefore, all equivalent transformations and modifications made within the scope of the claims of this application should fall within the coverage of the claims of this application.

Claims

1. A small-sized, sleeve-insulated, closed-type suspended intelligent flow regulation and water control pipe column, characterized in that, The device includes a tank body with an outer diameter between 135mm and 140mm. At least one end of the tank body is equipped with a conversion connector, which serves as a conversion thread between the tank body and the oil pipe. A suspension assembly is connected to the tank body via the conversion connector. A control cable and a submersible electric pump unit are housed within the tank body. At least one annular groove is provided on the outer wall of the tank body. Rectangular locking teeth are respectively provided at both ends of the annular groove. A pipeline protection device is fitted onto the outer wall of the tank body, and the pipeline protection device is disposed within the annular groove, engaging with the rectangular locking teeth. After the pipeline protection device is installed, the maximum outer diameter of the tank body and the pipeline protection device is less than 152mm.

2. The small-sized sleeve-type closed-loop intelligent flow control water pipe column as described in claim 1, characterized in that, The length of the tank is 5m or 8m.

3. The small-sized, sleeve-insulated, closed-type suspended intelligent flow control water pipe column as described in claim 1, characterized in that, The control cable is a plastic-encapsulated all-in-one cable.

4. The small-sized, sleeve-insulated, closed-type suspended intelligent flow control water pipe column as described in claim 1, characterized in that, The submersible electric pump unit is a small-sized submersible electric pump unit, which is suspended inside the tank.

5. The small-sized, sleeve-insulated, closed-type suspended intelligent flow control water pipe column as described in claim 1, characterized in that, The tank body is equipped with a protective short section.

6. A method for installing a small-sized, sleeve-insulated, closed-type suspended intelligent flow control water pipe column, characterized in that, Includes the following steps: Step 1: For the well section that needs to be completed, select the corresponding closed-loop suspension protection system based on reservoir characteristics, well structure design, mud layer conditions and production data, and determine the combination of hydraulic / electric control type or combined type intelligent flow control tubing string through calculation; Step 2: Based on the scheme determined in Step 1, select a suitable small-sized sleeve-type closed-loop intelligent flow control pipe column. The small-sized sleeve-type closed-loop intelligent flow control pipe column is the small-sized sleeve-type closed-loop intelligent flow control pipe column as described in any one of claims 1 to 5. Step 3: Lower the intelligent flow regulation and water control inner tubing string, install the closed suspension protection system, and perform outer diameter measurement of the protection system and signal testing of the downhole intelligent flow regulation device; Step 4: Based on the precise position of the segmented intelligent flow control tubing string and the tubing string length, sequentially lower the production annulus packer and tubing hanger, and fabricate control cables to pass through them. Lower the tubing string into place, complete the predetermined segmentation, set the packer, and install the wellhead and production process.

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