Casing well fine layering intelligent sand prevention and well completion integrated process pipe column

Abstract

The invention discloses a cased well fine layering intelligent sand prevention and well completion integrated process pipe column which comprises a steel wire / cable throwing-in and pulling type injection and production upper well completion pipe column, an injection and production sand prevention integrated pipe column and a wet type disconnecting / connecting system. The upper end of the injection-production sand prevention integrated pipe column is connected with a female connector of the wet type disconnecting / connecting system, the lower end of the steel wire / cable throwing-in and pulling type injection-production upper well completion pipe column is connected with a male connector of the wet type disconnecting / connecting system, and the male connector is in butt joint with the female connector. Through intelligent upgrading of a sand prevention tool and integrated integration of an injection-production well completion pipe column, refined layering is achieved, the requirements for oil production and water injection are met, and switching between early-stage liquid drainage and later-stage water injection can be directly achieved without moving the pipe column.

Description

Technical Field

[0001] This invention relates to the field of oil and gas well completion technology, and in particular to a casing well precision layering intelligent sand control integrated process tubing string. Background Technology

[0002] Currently, intelligent injection and production technology in offshore oilfields has entered the stage of large-scale application, achieving efficient measurement and adjustment, digitalization, and intelligent transformation. However, significant challenges remain in areas such as tubing life extension and data monitoring, mainly in the following aspects: First, regarding the integration of intelligent sand control, offshore well completion and injection and production processes are independent, requiring two separate sets of tubing strings for sand control and intelligent injection and production. After sand control in the wellbore, the inner diameter is small, limiting the tubing string size and center diameter in the intelligent injection and production process, thus restricting large-volume injection and production at the injection and production layers and affecting the development and production of oil and water wells. Second, in terms of intelligent well completion operations, improving operational efficiency and extending tubing life are inevitable trends in the development of intelligent integrated sand control and production technology. In marginal oilfields, where no workover rig platform is used, completion and tubing string operations require drilling vessel operations, resulting in high operating costs. Therefore, intelligent transformation is urgently needed to achieve precise stratification and accelerated and efficient operations. Summary of the Invention

[0003] To solve the above-mentioned technical problems, this invention provides a casing string for a finely layered, intelligent sand control and completion integrated process.

[0004] The present invention is achieved by the following technical solution.

[0005] A precision-layered intelligent sand control and completion integrated process string for casing wells includes a wire / cable-dropped injection-production upper completion string, an integrated injection-production sand control string, and a wet disconnect / connection system. The upper end of the integrated injection-production sand control string is connected to the female connector of the wet disconnect / connection system, and the lower end of the wire / cable-dropped injection-production upper completion string is connected to the male connector of the wet disconnect / connection system. The male connector is mated with the female connector.

[0006] Furthermore, the upper completion string for the wire / cable drop-and-retrieve injection-production system includes an upper casing / tubing, with the lower end of the casing / tubing sequentially connected to an electro-hydraulic circulating sleeve, an electro-hydraulic downhole safety valve, and a male connector for a wet disconnect / connect system.

[0007] Furthermore, the integrated injection-production sand control tubing includes an electrically / hydraulic setter-through top packer, with multiple tubing structures connected below the setter, and adjacent tubing structures separated by electrically / hydraulic setter-through isolation packers; the tubing structure includes a cable-through double-layer screen pipe, an intelligent flow control valve for the screen pipe, and a cable-through double-layer screen pipe connected in sequence; an electrically / hydraulic setter-through bridge plug is connected at the lowest end of the integrated injection-production sand control tubing.

[0008] Furthermore, the electric / hydraulic setter through-type top packer and the electric / hydraulic setter through-type isolation packer are equipped with cable crossing channels.

[0009] Furthermore, a cable is connected to the male connector of the wet disconnect / connect system, and the cable extends to the wellhead.

[0010] Furthermore, a second cable is connected to the female connector of the wet disconnect / connect system, and the other end of the second cable is connected to the screen tube using an intelligent flow control valve.

[0011] This application has the following beneficial effects.

[0012] This invention integrates the sand control tubing with the production / injection tubing, enabling precise layered and segmented intelligent production control. It achieves rig-free sand control and electric pump deployment, improving well completion efficiency and automation. This invention features ingenious structural design, strong practicality, excellent performance, and broad application prospects. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention;

[0014] Figure 2 This is a schematic diagram of the injection principle of the present invention (arrows indicate the direction of liquid flow);

[0015] Figure 3 This is a schematic diagram of the principle of this invention (arrows indicate the direction of liquid flow);

[0016] Figure 4 This is a schematic diagram of the structure of the cable passing through the double-layer screen tube of the present invention;

[0017] Figure 5 This is a schematic diagram of the intelligent flow control valve for screen tubes according to the present invention.

[0018] The components include: 1. Wire / cable drop-and-retrieve injection-production top completion string; 1-1. Casing / Tubing; 1-2. Electro- or hydraulically controlled circulating sleeve; 1-3. Electro- or hydraulically controlled downhole safety valve; 2. Integrated injection-production sand control string; 2-1. Electro- or hydraulically set through-type top packer; 2-2. Cable through-type double-layer screen pipe; 2-2-1. Groove; 2-3. Intelligent flow control valve for screen pipe; 2-3-1. Outer cover; 2-3-2. Bypass interlayer two; 2-3-3. Intelligent flow control valve switching mechanism for screen pipe; 2-4. Electro- or hydraulically set through-type isolation packer; 2-5. Electro- or hydraulically set bridge plug; 3. Wet disconnect / connection system; 3-1. Male connector; 3-2. Female connector; 3-3. Cable one; 3-4. Cable two. Detailed Implementation

[0019] The present patent application will be further described below with reference to the accompanying drawings and embodiments.

[0020] like Figure 1 As shown, a cased well fine-layer intelligent sand control and completion integrated process string includes a wire / cable drop-and-retrieve injection and production upper completion string 1, an injection and production sand control integrated string 2 connected to an intelligent flow control valve and screen pipe, and a wet disconnect / connect system 3.

[0021] The integrated injection-production and sand control tubing string 2 is located at the lowest injection-production layer of the oil and gas well. Its upper end is connected to the female connector 3-2 of the wet disconnect / connect system 3. The lower end of the wire / cable drop-and-retrieve injection-production upper completion tubing string 1 is connected to the male connector 3-1 of the wet disconnect / connect system 3. This tubing string connects from the wellhead to the downhole. The male connector 3-1 of the wet disconnect / connect system is connected to the female connector 3-2 to achieve the integrity of the entire tubing string. Through the intelligent upgrade of sand control tools and the integrated integration of injection-production and completion tubing strings, refined stratification is achieved, meeting the needs of oil production and water injection, and allowing for the switching between early-stage fluid drainage and late-stage water injection without moving the tubing string.

[0022] The upper end of the integrated injection and sand control tubing string 2 is an electrically / hydraulic setter-type through-type top packer 2-1, below which are sequentially connected a cable-passing double-layer screen pipe 2-2, a smart flow control valve for the screen pipe 2-3, another cable-passing double-layer screen pipe 2-2, and an electrically / hydraulic setter-type through-type isolation packer 2-4. The lower part of the above tubing string structure repeatedly connects the cable-passing double-layer screen pipe 2-2, the smart flow control valve for the screen pipe 2-3, and the cable-passing double-layer screen pipe 2-2 combination, which can be connected to form a multi-layer tubing string. The bottom end of the tubing string is connected to an electrically / hydraulic setter-type bridge plug 2-5.

[0023] Specifically, such as Figure 4 As shown, the cable passes through the double-layer screen tube 2-2 and has a groove 2-2-1 on the outside for the cable to pass through. The internal structure of the cable passing through the double-layer screen tube 2-2 in this application is the same as the structure of the Chinese invention patent application with publication number CN109763795A and patent name "A Bypass Guide Screen Tube".

[0024] like Figure 5As shown, the intelligent flow control valve 2-3 for the screen pipe includes an outer cover 2-3-1, inside which is a switching mechanism 2-3-3 for the intelligent flow control valve for the screen pipe. A bypass interlayer 2-3-2 is formed between the outer cover 2-3-1 and the switching mechanism 2-3-3. The switching mechanism 2-3-3 for the intelligent flow control valve for the screen pipe in this application has the same structure as that in Chinese invention patent application with publication number CN115613997A and patent title "An Electrically Controlled Circulating Sleeve". This invention uses an electric control valve to open and close, and the valve opening degree can be infinitely adjusted; it integrates a pressure sensor, a temperature sensor, and a flow meter to monitor downhole parameters in real time and return the data to the surface control system; it has a double-layer structure, which is connected to the inner and outer layers of the double-layer screen pipe 2-2 by the cable passing through them respectively. The double-layer structure has a bypass interlayer between it, which provides both an injection and production channel and a sand control function.

[0025] The three tools, namely the electric / hydraulic setting through-type top packer 2-1, the electric / hydraulic setting through-type isolation packer 2-4, and the electric / hydraulic setting bridge plug 2-5, adopt electric or hydraulic setting methods to seal the wellbore and achieve reservoir stratification. The electric / hydraulic setting through-type top packer 2-1 and the electric / hydraulic setting through-type isolation packer 2-4 are equipped with cable crossing channels, and the crossing channels can be sealed.

[0026] The upper part of the steel wire / cable drop-and-release injection-production upper completion string 1 is casing / tubing 1-1, which is suspended on the tubing hanger at the wellhead. The drop-and-release electric pump can be selectively lowered inside. The lower end of casing / tubing 1-1 is connected to the electro-controlled / hydraulic circulating sleeve 1-2, electro-controlled / hydraulic downhole safety valve 1-3, and male connector 3-1 of wet disconnect / connection system 3.

[0027] Specifically, the electrically controlled / hydraulic circulating sleeve 1-2 and the electrically controlled / hydraulic downhole safety valve 1-3 are switched on and off using either electrical or hydraulic control methods, eliminating the need for wireline operations.

[0028] The wet disconnect / connect system 3 comprises two parts: a male connector 3-1 and a female connector 3-2. The male connector 3-1 is connected to the lower end of the upper completion string 1 of the wire / cable drop-and-release injection-production system, and the female connector 3-2 is connected to the upper end of the integrated injection-production sand control string 2. A cable 3-3 is installed on the male connector 3-1 of the wet disconnect / connect system 3, connecting it to the wellhead. A cable 3-4 is installed on the female connector 3-2 of the wet disconnect / connect system 3, connecting it to the intelligent flow control valve 2-3 for the screen pipe.

[0029] The working principle of the casing well precision layered intelligent sand control and completion integrated process string of this invention is as follows:

[0030] Working principle of running in and setting the tubing string: Connect the intelligent flow control valve and the integrated injection-production sand control tubing string 2 (screen pipe integrated connection), wet disconnect / connect system 3, and wire / cable drop-and-retrieve injection-production upper completion tubing string 1 in sequence. Then run to the designed depth and set the tubing string. Close all electrically / hydraulically controlled circulating sleeves 1-2 and the intelligent flow control valve 2-3 for the screen pipe. Open the electrically / hydraulically controlled downhole safety valve 1-3. Then pressurize the casing / tubing 1-1 or provide an electrical signal from the surface to set the electrically / hydraulically set through-type top packer 2-1, the electrically / hydraulicly set through-type isolation packer 2-4, and the electrically / hydraulicly set bridge plug 2-5.

[0031] Injection principle: See Figure 2 Taking injection at a single layer as an example: An electrical signal is sent from the surface. This signal is transmitted sequentially through cable 3-3, male connector 3-1, female connector 3-2, and cable 3-4 to the intelligent flow control valve 2-3 for the screen pipe. This opens the valve, allowing liquid to be injected into the casing / tubing 1-1. The injected fluid passes through the switching mechanism of the intelligent flow control valve 2-3 into the bypass interlayer, then through the bypass interlayer of the double-layer screen pipe 2-2 via the cable, and finally through the sand-proof metal permeation layer and outer protective cover of the double-layer screen pipe 2-2 into the wellbore. After injection is complete, an electrical signal is sent from the surface to close the intelligent flow control valve 2-3. Multiple layers can be injected simultaneously.

[0032] Extraction principle: See Figure 3 Taking a specific layer as an example: The intelligent flow control valve 2-3 on the screen pipe remains open. The extracted fluid passes through the sand-proof metal permeation layer and outer protective cover of the double-layer screen pipe 2-2 via a cable, then through the bypass interlayer of the double-layer screen pipe 2-2, and finally through the bypass interlayer of the intelligent flow control valve 2-3. Finally, it enters the tubing and is produced to the surface through the switching mechanism of the intelligent flow control valve 2-3. Multiple layers can be extracted simultaneously.

[0033] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A casing string for a finely layered intelligent sand control and completion integrated process, characterized in that: It includes a wire / cable drop-and-release injection-production upper completion string (1), an integrated injection-production-sand control string (2), and a wet disconnect / connection system (3); the upper end of the integrated injection-production-sand control string (2) is connected to the female connector (3-2) of the wet disconnect / connection system (3), and the lower end of the wire / cable drop-and-release injection-production upper completion string (1) is connected to the male connector (3-1) of the wet disconnect / connection system (3), and the male connector (3-1) is connected to the female connector (3-2).

2. The casing string for a finely layered intelligent sand control and completion integrated process in casing wells according to claim 1, characterized in that: The wire / cable drop-and-release injection-production upper completion string (1) includes an upper casing / tubing (1-1), and the lower end of the casing / tubing (1-1) is connected in sequence to an electrically controlled / hydraulic circulating sleeve (1-2), an electrically controlled / hydraulic downhole safety valve (1-3), and a male connector (3-1) of a wet disconnect / connect system (3).

3. The casing string for a finely layered intelligent sand control and completion integrated process in casing wells according to claim 1, characterized in that: The integrated injection and production sand control tubing (2) includes an electric / hydraulic setting through-type top packer (2-1), and multiple tubing structures are connected below the electric / hydraulic setting through-type top packer (2-1). Adjacent tubing structures are separated by an electric / hydraulic setting through-type isolation packer (2-4). The tubing structure includes a cable passing through a double-layer screen pipe (2-2), a smart flow control valve for the screen pipe (2-3), and a cable passing through a double-layer screen pipe (2-2) connected in sequence. An electric / hydraulic setting bridge plug (2-5) is connected at the lowest end of the integrated injection and production sand control tubing (2).

4. The casing string for a finely layered intelligent sand control and completion integrated process in casing wells according to claim 3, characterized in that: The electric / hydraulic setter pass-through top packer (2-1) and the electric / hydraulic setter pass-through isolation packer (2-4) are equipped with cable passageways.

5. The casing string for a finely layered intelligent sand control and completion integrated process in casing wells according to claim 1, characterized in that: Cable 1 (3-3) is connected to the male connector (3-1) of the wet disconnect / connect system (3), and cable 1 (3-3) extends to the wellhead.

6. The casing string for a finely layered intelligent sand control and completion integrated process in casing wells according to claim 1, characterized in that: The female connector (3-2) of the wet disconnect / connect system (3) is connected to cable two (3-4), and the other end of cable two (3-4) is connected to the intelligent flow control valve (2-3) for the screen tube.

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