A well testing and measuring device for dynamic storage capacity of carbon dioxide

Abstract

The present invention discloses a carbon dioxide dynamic storage capacity well test measurement device, including an injection well test device and at least one observation well test device; the injection well test device includes a first casing, and a first oil pipe, a safety joint, a cable packer, an adjustment oil pipe and a cable-type downhole intelligent switch built in the first casing from the wellhead to the downhole in sequence; the cable-type downhole intelligent switch is integrated with a storage pressure gauge at the rear of the shell, and the head of the shell of the cable-type downhole intelligent switch is connected to a pressure gauge holder. The real-time dynamic pressure and temperature accurate monitoring of CO2 injection wells and related observation wells for up to one year is realized, and the direct-reading pressure gauge realizes dual backup, and uploads data to a cloud server in real time, and can download, browse, query data and output pressure / temperature curve reports at the terminal, so that professional logging engineers can accurately analyze and study the dynamic storage of CO2 and evaluate the economic efficiency.

Description

Technical Field

[0001] The invention belongs to the field of dynamic storage of carbon dioxide in oil and gas fields, and in particular relates to a well testing and measuring device for the dynamic storage capacity of carbon dioxide. Background Art

[0002] The CO2 generated in industrial production is liquefied and transported to the oil and gas well mining area, and injected into the formation to achieve CO2 storage, which can reduce CO2 emissions; at the same time, practice has proved that CO2 has a good viscosity reduction and dissolution effect on low permeability reservoirs, which can increase production and generate income in low permeability reservoirs. At present, the implementation of CO2 dynamic storage projects in China is relatively extensive. Due to the special high temperature and high pressure corrosive environment of CO2, it is impossible to conduct accurate analysis and research and economic evaluation on the dynamic storage effect of CO2 injection in China. Summary of the invention

[0003] The purpose of the present invention is to address the deficiencies of the above-mentioned technologies and provide a well testing and measuring device that can realize the dynamic storage capacity of carbon dioxide for a long time, so as to accurately analyze and study the dynamic storage of CO2.

[0004] To achieve the above-mentioned purpose, the carbon dioxide dynamic storage capacity well testing and measuring device designed in the present invention includes an injection well testing device and at least one observation well testing device; the injection well testing device includes a first casing, and a first oil pipe, a safety joint, a cable packer, an adjustment oil pipe and a cable-type downhole intelligent switch that are sequentially built into the first casing from the wellhead to the downhole; the cable-type downhole intelligent switch is integrated with a storage pressure gauge at the rear of the outer shell, and the head of the outer shell of the cable-type downhole intelligent switch is connected to a pressure gauge holder, and the pressure gauge holder integrates at least two direct-reading pressure gauges side by side.

[0005] Furthermore, a sealing piston is sleeved on the outer periphery of the central tube of the cable packer, and the end of the sealing piston is inserted between the central tube and the upper gauge ring. A locking ring is arranged between one end of the sealing piston and the outer shell of the cable packer, and a locking block is arranged between the other end of the sealing piston and the outer shell.

[0006] Furthermore, the cable passage through the cable packer is a through eccentric hole with conical sealing threads at both ends. One end of the eccentric hole is connected to the sleeve joint to form a hard seal, and the other end of the eccentric hole is connected to the adjustment oil pipe and tightened to form a hard seal.

[0007] Furthermore, the internal flow channel of the cable-type downhole intelligent switch is a waist-shaped groove flow channel at the pressure gauge holder part and is an annular flow channel at the cable-type downhole intelligent switch part.

[0008] Furthermore, the direct-reading pressure gauge is located in an open groove of the pressure gauge holder, a holder protection cover is provided at the opening of the open groove, and the holder protection cover and the pressure gauge holder are integrally welded to the housing.

[0009] Furthermore, the storage type pressure gauge is built in a pressure gauge protective cover, and the pressure gauge protective cover is rigidly connected to the housing via threads.

[0010] Furthermore, the observation well testing device includes a second casing and a second oil pipe, and a steel pipe cable, two first compression pipe joints connected in series, a cable connector, a distributor and two second compression pipe joints connected in parallel, which are sequentially built into the second oil pipe from the wellhead to the wellbore. The steel pipe cable and all the compression pipe joints are connected by metal hard seals, one of the first compression pipe joints is sealed with a cone thread at one end of the cable connector, and the other end of the cable connector is welded and sealed with the distributor; the other first compression pipe joint and the two second compression pipe joints are all connected to the distributor by cone thread seals.

[0011] Compared with the prior art, the present invention has the following advantages: the carbon dioxide dynamic storage capacity well test measurement device of the present invention realizes the real-time dynamic pressure and temperature accurate monitoring of CO2 injection wells and related observation wells for up to one year, and the direct-reading pressure gauge realizes dual backup, and uploads data to the cloud server in real time. The data can be downloaded, browsed, queried and the pressure / temperature curve report can be output on the terminal, so that professional logging engineers can conduct accurate analysis and research and economic evaluation of CO2 dynamic storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the well testing and measuring device for the dynamic storage capacity of carbon dioxide of the present invention.

[0013] Figure 2 for Figure 1 Schematic diagram of the well testing device for the injection well.

[0014] Figure 3 for Figure 2 Schematic diagram of the mid-pass cable packer.

[0015] Figure 4 for Figure 2 Schematic diagram of the connection of the cable-type underground intelligent switch.

[0016] Figure 5 for Figure 3 An enlarged schematic diagram of the internal part of the cable packer.

[0017] Figure 6 for Figure 1 Schematic diagram of the well testing device in the observation well.

[0018] Figure 7 for Figure 6 Enlarged schematic diagram of some structures.

[0019] The components in the figure are numbered as follows: injection well test device 10, first casing 11, first oil pipe 12, safety joint 13, cable packer 14 (including: sleeve joint 14.1, setting piston 14.2, center pipe 14.3, lock ring 14.4, upper gauge ring 14.5, primary pin 14.6, lock block 14.7, start sleeve 14.8), adjustment oil pipe 15, pressure gauge support 16 (including: direct reading pressure gauge 16.1, support protective cover 16.2), cable downhole intelligent switch 17 (including: storage pressure gauge 17.1, pressure gauge protective cover 17.2), landing nipple 18;

[0020] Observation well testing device 20, second casing 21, second oil pipe 22, steel pipe cable 23, first ferrule joint 24, cable connection seat 25, distributor 26, second ferrule joint 27, tapered thread seal 28. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] like Figure 1 The carbon dioxide dynamic storage capacity well testing and measuring device shown comprises an injection well testing device 10 and at least one observation well testing device 20, and integrates the data of the measurement and control equipment of each well to a ground control cabinet through cables.

[0023] like Figure 2 The injection well testing device 10 comprises a first casing 11, and a first oil pipe 12, a safety joint 13, a cable packer 14, an adjustment oil pipe 15 and a cable-type downhole intelligent switch 17 which are sequentially built into the first casing 11 from the wellhead to the downhole, wherein the first oil pipe 12 comprises a plurality of standard oil pipes which are connected by landing nipples 18. Figure 4 As shown, the cable-type downhole intelligent switch 17 integrates a storage pressure gauge 17.1 at the rear of the shell through a threaded connection. The storage pressure gauge 17.1 is protected against collision by a pressure gauge protective cover 17.2. The pressure gauge protective cover 17.2 is hard-connected to the shell through threads and is reliably fastened. At the same time, a pressure gauge holder 16 is connected to the head of the shell of the cable-type downhole intelligent switch 17 through threads. The pressure gauge holder 16 integrates two direct-reading pressure gauges 16.1 side by side. The two direct-reading pressure gauges 16.1 are located in the open groove of the pressure gauge holder 16 and are fixed by nuts and screws. A holder protective cover 16.2 is provided at the opening of the open groove. The holder protective cover 16.2 and the pressure gauge holder 16 are integrally welded to the shell.

[0024] Because the cable-type downhole intelligent switch 17 integrates two direct-reading pressure gauges 16.1, the internal flow channel of the cable-type downhole intelligent switch is a waist-shaped groove flow channel at the pressure gauge holder and a ring flow channel at the cable-type downhole intelligent switch. Since the cable-type downhole intelligent switch integrates two direct-reading pressure gauges, a splitter is provided on the pressure gauge holder to divide one cable lead-in line into three lines to meet the needs of power supply and communication. The lead-out end of the splitter is sealed with a metal hard seal through a ferrule joint, and the steel pipe cable at the lead-out end is welded to the splitter to achieve reliable sealing of the line head.

[0025] Combination Figure 3 and Figure 5 As shown, the cable passage of the cable packer 14 is a through eccentric hole, and both ends of the eccentric hole are conical sealing threads. One end of the eccentric hole is connected to the sleeve joint 14.1 to form a hard seal, and the other end of the eccentric hole is connected and fastened to the adjustment oil pipe 15 to form a hard seal. Since the cable packer is easily scratched against the inner wall of the casing during the lowering process, resulting in an accidental setting situation, the present invention is provided with a setting piston 14.2 on the outer periphery of the center pipe 14.3 of the cable packer 14, the end of the setting piston 14.2 is inserted between the center pipe 14.3 and the upper gauge ring 14.5, a locking ring 14.4 is provided between one end of the setting piston 14.2 and the outer shell of the cable packer 14, and a locking block 14.7 is provided between the other end of the setting piston 14.2 and the outer shell. When the upper gauge ring 14.5 is stuck, the locking block 14.7 makes the central pipe 14.3 and the setting piston 14.2 become one and cannot move relative to each other due to the action of the locking block 14.7, thereby preventing the first-level pin 14.6 from being sheared off in advance and causing early accidental setting; after being normally lowered to the predetermined position, the wellhead is pressurized to cause the starting sleeve 14.8 to move upward to shear off the first-level pin 14.6, the locking block 14.7 pops up upward, and the setting piston 14.2 moves downward under the action of the pressure difference to compress the rubber barrel until the isolation effect of the target layer is achieved.

[0026] like Figure 6 , Figure 7 The observation well testing device shown includes a second casing 21 and a second oil pipe 22, and a steel pipe cable 23, two first ferrule joints 24 connected in series, a cable connector 25, a distributor 26 and two second ferrule joints 27 connected in parallel, which are sequentially built into the second oil pipe from the wellhead to the well. The steel pipe cable 23 and all the ferrule joints are connected by metal hard seals. One of the first ferrule joints 24 is sealed with a cone thread 28 at one end of the cable connector 25, and the other end of the cable connector 25 is welded and sealed with the distributor 26, so as to achieve reliable sealing of the cable connector; another first ferrule joint 24 and two second ferrule joints 27 are connected with the distributor 26 by cone thread seals. The connection parts of the distributor are all in the form of cone thread hard seals, so they have good high-pressure gas sealing performance.

[0027] The carbon dioxide dynamic storage capacity well test and measurement device of the present invention realizes accurate real-time dynamic pressure and temperature monitoring of CO2 injection wells and related observation wells for up to one year, and the direct-reading pressure gauge realizes dual backup and uploads data to the cloud server in real time. The data can be downloaded, browsed, and queried at the terminal, and pressure / temperature curve reports can be output. Professional well logging engineers can use this to accurately analyze and study the dynamic storage of CO2 and evaluate its economic feasibility.

Claims

1. A carbon dioxide dynamic storage capacity well testing and measuring device, comprising an injection well testing device (10) and at least one observation well testing device (20); characterized in that: The injection well testing device (10) comprises a first casing (11), and a first oil pipe (12), a safety joint (13), a cable packer (14), an adjustment oil pipe (15), and a cable-type downhole intelligent switch (17) which are sequentially built into the first casing (11) from the wellhead to the downhole; the cable-type downhole intelligent switch (17) is integrated with a storage pressure gauge (17.1) at the rear of the shell, and the head of the shell of the cable-type downhole intelligent switch (17) is connected to a pressure gauge holder (16), and the pressure gauge holder (16) is integrated with at least two direct-reading pressure gauges (16.1) side by side; A setting piston (14.2) is sleeved on the outer periphery of the central tube (14.3) of the cable packer (14); the end of the setting piston (14.2) is inserted between the central tube (14.3) and the upper gauge ring (14.5); a locking ring (14.4) is provided between one end of the setting piston (14.2) and the outer shell of the cable packer (14); and a locking block (14.7) is provided between the other end of the setting piston (14.2) and the outer shell; The cable passage through the cable packer (14) is a through eccentric hole, with conical sealing threads at both ends of the eccentric hole. One end of the eccentric hole is connected to a sleeve pipe joint (14.1) to form a hard seal, and the other end of the eccentric hole is connected to an adjustment oil pipe (15) and tightened to form a hard seal.

2. The carbon dioxide dynamic storage capacity well testing and measuring device according to claim 1 is characterized in that: The internal flow channel of the cable-type downhole intelligent switch is a waist-shaped groove flow channel at the pressure gauge support tube position and is an annular flow channel at the cable-type downhole intelligent switch position.

3. The carbon dioxide dynamic storage capacity well testing and measuring device according to claim 1 is characterized in that: The direct-reading pressure gauge (16.1) is located in an open groove of the pressure gauge holder (16); a holder protection cover (16.2) is provided at the opening of the open groove; the holder protection cover (16.2) and the pressure gauge holder (16) are integrally welded to the housing.

4. The carbon dioxide dynamic storage capacity well testing and measuring device according to claim 1, characterized in that: The storage type pressure gauge (17.1) is built into a pressure gauge protective cover (17.2), and the pressure gauge protective cover (17.2) is rigidly connected to the housing via threads.

5. The carbon dioxide dynamic storage capacity well testing and measuring device according to claim 1, characterized in that: The observation well testing device (20) comprises a second casing (21) and a second oil pipe (22), and a steel pipe cable (23) built into the second oil pipe (22) from the wellhead to the wellbore, two first ferrule joints (24) connected in series, a cable connection seat (25), a distributor (26) and two second ferrule joints (27) connected in parallel, wherein the steel pipe cable (23) and all the ferrule joints are connected by metal hard seals, wherein one of the first ferrule joints (24) is sealed with a conical thread (28) at one end of the cable connection seat (25), and the other end of the cable connection seat (25) is welded and sealed with the distributor (26); and another first ferrule joint (24) and the two second ferrule joints (27) are all connected to the distributor (26) by conical thread seals.

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