Offshore oilfield chemical flooding fully-closed instant curing injection allocation process equipment and use method

Abstract

The invention discloses offshore oilfield chemical flooding fully-closed instant curing injection allocation process equipment and a using method. The offshore oilfield chemical flooding fully-closed instant curing injection allocation process equipment comprises an efficient dispersion system, an instant curing system and a high-pressure injection system which are sequentially connected. The efficient dispersing system comprises a feeding mechanism and a dispersing mechanism which are connected with each other; the instant curing system comprises a high-viscosity efficient ager, a supergravity ager, a low-shear feeding pump, a tubular rotational flow ager and a mother liquor duplex filter which are communicated in sequence; the high-pressure injection system comprises a high-pressure polymer injection pump, a high-pressure tubular rotational flow ager, a first high-pressure internal part coupling disperser and a second high-pressure internal part coupling disperser which are connected in sequence. By taking the stator and rotor disperser, the internal part coupling dynamic disperser, the high-viscosity and high-efficiency ager and the supergravity ager as a core, the device has the characteristics of low carbon, high efficiency, miniaturization, modularization, distribution and the like, the polymer dissolving and curing time is shortened, the equipment weight and the occupied area are reduced, and the polymer solution viscosity and the oil displacement efficiency are improved.

Description

Technical Field

[0001] The present invention belongs to the field of solution injection process equipment, and particularly relates to a fully enclosed, rapid dissolution and aging injection process equipment for chemical flooding in offshore oilfields and its usage method. Background Art

[0002] Since CNOOC first carried out the polymer flooding single-well injection test in the Bohai SZ36-1 oilfield in 2003, the chemical flooding technology has gradually achieved large-scale popularization and application in multiple offshore oilfields, obtaining good economic and social benefits, and has currently become a leading technology for tertiary oil recovery in offshore heavy oil fields, low-permeability oil fields, etc. With the gradual increase in new facilities and operation volumes, the available space resources for chemical flooding operations on old platforms are decreasing day by day, making it difficult to arrange the existing continuous injection process equipment with dissolution tanks + grinding pumps + aging tanks as the core, which restricts the further large-scale popularization and application of chemical flooding technology in offshore oilfields. Summary of the Invention

[0003] The present invention is proposed to solve the problems existing in the prior art, and its purpose is to provide a fully enclosed, rapid dissolution and aging injection process equipment for chemical flooding in offshore oilfields and its usage method.

[0004] The present invention is achieved through the following technical solutions:

[0005] A fully enclosed, rapid dissolution and aging injection process equipment for chemical flooding in offshore oilfields includes a high-efficiency dispersion system, a rapid dissolution and aging system, and a high-pressure injection system connected in sequence through inter-skid pipelines; the high-efficiency dispersion system includes a feeding mechanism and a dispersion mechanism connected to each other; the feeding mechanism includes a polymer dry powder feeding unit and a liquid preparation water feeding unit; the rapid dissolution and aging system includes a high-viscosity and high-efficiency aging device, a rotating packed bed aging device, a low-shear feeding pump, a tubular cyclone aging device, and a mother liquor double filter connected in sequence through a mother liquor pipeline; the high-pressure injection system includes a high-pressure polymer injection pump, a high-pressure tubular cyclone aging device, a No. I high-pressure internal part coupling disperser, and a No. II high-pressure internal part coupling disperser connected in sequence.

[0006] In the above technical solution, the polymer dry powder feeding unit includes a storage tank connected to a polymer dry powder ton bag through a dry powder feeding hose, the feeding end of the dry powder feeding hose is inserted into the polymer dry powder ton bag, an electric feeding machine is arranged at the top feeding port of the storage tank, a screw feeder is arranged at the bottom discharging port of the storage tank, an air inlet is arranged at the lower part of the storage tank, and the air inlet is connected to the nitrogen main pipeline through a dry powder nitrogen pipeline; the liquid preparation water feeding unit includes a water supply double filter, and the water inlet of the water supply double filter is connected to a low-pressure liquid preparation water supply source through a low-pressure water supply pipeline; the dispersion mechanism includes a stator-rotor disperser, an ultrasonic disperser, and an internal part coupling dynamic disperser connected in sequence through a stock solution pipeline; a low-shear transfer pump is arranged on the stock solution pipeline between the ultrasonic disperser and the internal part coupling dynamic disperser.

[0007] In the above technical solution, a venting mechanism and a pressure transmitter are arranged at the top of the storage tank. The venting mechanism includes a venting pipeline communicated with the storage tank, a safety valve and a venting solenoid valve arranged on the venting pipeline, and the venting solenoid valve is arranged close to the storage tank; a high-level transmitter and a low-level transmitter are sequentially arranged on the side wall of the storage tank from top to bottom; a dry powder nitrogen gas solenoid valve is arranged on the dry powder nitrogen gas pipeline.

[0008] In the above technical solution, a low-pressure water supply shut-off ball valve, a water supply pressure transmitter, a water supply temperature transmitter and a water supply sampler are sequentially arranged in the direction of tap water on the low-pressure water supply pipeline.

[0009] In the above technical solution, the feed inlet of the stator-rotor disperser is communicated with the discharge outlet of the screw feeder through a feeding hose; the water inlet of the stator-rotor disperser is communicated with the water outlet of the water supply double filter through a primary water supply pipeline; the liquid inlet of the ultrasonic disperser is communicated with the liquid outlet of the stator-rotor disperser, and the liquid outlet of the ultrasonic disperser is communicated with the liquid inlet of the low-shear transfer pump; the No. I liquid inlet of the internal part coupled dynamic disperser is communicated with the discharge outlet of the low-shear transfer pump, and the No. II liquid inlet of the internal part coupled dynamic disperser is communicated with the water outlet of the water supply double filter through a secondary water supply pipeline; a primary water supply flowmeter and a primary water supply regulating valve are sequentially arranged in the direction of tap water on the primary water supply pipeline; a secondary water supply flowmeter and a secondary water supply regulating valve are sequentially arranged in the direction of tap water on the secondary water supply pipeline; the liquid outlet of the internal part coupled dynamic disperser is communicated with a mother liquor pipeline, a mother liquor check valve is arranged on the mother liquor pipeline, and the other end of the mother liquor pipeline is communicated with the instant dissolving and ripening system through an inter-skid pipeline.

[0010] In the above technical solution, a ripening vessel venting mechanism is arranged at the top of the high-viscosity and high-efficiency ripening vessel. The ripening vessel venting mechanism includes a venting pipeline communicated with the high-viscosity and high-efficiency ripening vessel, a No. I ripening vessel safety valve, a No. I ripening vessel venting solenoid valve and a No. I ripening vessel pressure transmitter which are sequentially arranged from top to bottom on the venting pipeline; a No. I liquid level transmitter is arranged at the bottom liquid inlet of the high-viscosity and high-efficiency ripening vessel; the high-viscosity and high-efficiency ripening vessel is provided with an air inlet, and the air inlet is communicated with the nitrogen gas main pipeline through a high-viscosity and high-efficiency ripening vessel nitrogen gas pipeline, and a No. I nitrogen gas solenoid valve is arranged on the high-viscosity and high-efficiency ripening vessel nitrogen gas pipeline.

[0011] In the above technical solution, a venting mechanism of the high-gravity aging reactor is arranged at the top of the high-gravity aging reactor. The venting mechanism of the high-gravity aging reactor includes a venting pipeline communicated with the high-gravity aging reactor, and a No. II aging reactor safety valve, a No. II aging reactor venting solenoid valve and a No. II aging reactor pressure transmitter which are sequentially arranged on the venting pipeline from top to bottom; a No. II liquid level transmitter is arranged at the bottom of the high-gravity aging reactor; the high-gravity aging reactor is provided with an air inlet, and the air inlet is communicated with a nitrogen gas main pipeline through a high-gravity aging reactor nitrogen gas pipeline, and a No. II nitrogen gas solenoid valve is arranged on the high-gravity aging reactor nitrogen gas pipeline; on the mother liquid pipeline at the liquid outlet of the high-gravity aging reactor, a mother liquid sampler, an on-line mother liquid viscosity detector and a mother liquid pressure transmitter are sequentially arranged in the liquid flow direction.

[0012] In the above technical solution, the liquid inlet of the high-pressure polymer injection pump is communicated with the pipeline between the quick-dissolving aging system and the high-pressure injection system through a mother liquid pipeline, and the liquid outlet of the high-pressure polymer injection pump is communicated with the liquid inlet of the high-pressure tubular swirl aging reactor through a high-pressure mother liquid pipeline; the liquid outlet of the high-pressure tubular swirl aging reactor is respectively communicated with the liquid inlets of a No. I high-pressure inner part coupling disperser and a No. II high-pressure inner part coupling disperser through a No. I high-pressure mother liquid pipeline branch and a No. II high-pressure mother liquid pipeline branch; a No. I well high-pressure mother liquid flowmeter and a No. I well high-pressure mother liquid regulating valve are arranged on the No. I high-pressure mother liquid pipeline branch; a No. II well high-pressure mother liquid flowmeter and a No. II well high-pressure mother liquid regulating valve are arranged on the No. II high-pressure mother liquid pipeline branch; the liquid inlet of the No. I high-pressure inner part coupling disperser is communicated with the driving oil auxiliary agent main line through a No. I driving oil auxiliary agent pipeline; the water inlet of the No. I high-pressure inner part coupling disperser is communicated with the high-pressure liquid mixing water supply main line through a No. I high-pressure water supply pipeline; the liquid outlet of the No. I high-pressure inner part coupling disperser is communicated with a No. I well through a No. I well target liquid injection pipeline; a No. I well driving oil auxiliary agent ball valve is arranged on the No. I driving oil auxiliary agent pipeline; on the No. I high-pressure water supply pipeline, a No. I well high-pressure water supply flowmeter and a No. I well high-pressure water supply regulating valve are sequentially arranged in the liquid flow direction; on the No. I well target liquid injection pipeline, a No. I well target liquid pressure transmitter, a No. I well target liquid on-line viscosity detector, a No. I well target liquid sampler and a No. I well target liquid ball valve are sequentially arranged in the liquid flow direction; the liquid inlet of the No. II high-pressure inner part coupling disperser is communicated with the driving oil auxiliary agent main line through a No. II driving oil auxiliary agent pipeline; the water inlet of the No. II high-pressure inner part coupling disperser is communicated with the high-pressure liquid mixing water supply main line through a No. II high-pressure water supply pipeline; the liquid outlet of the No. II high-pressure inner part coupling disperser is communicated with a No. II well through a No. II well target liquid injection pipeline; a No. II well driving oil auxiliary agent ball valve is arranged on the No. II driving oil auxiliary agent pipeline; a No. II well high-pressure water supply flowmeter and a No. II well high-pressure water supply regulating valve are arranged on the No. II high-pressure water supply pipeline; a No. II well target liquid pressure transmitter, a No. II well target liquid on-line viscosity detector / No. II well target liquid sampler and a No. II well target liquid ball valve are arranged on the No. II well target liquid injection pipeline.

[0013] In the above technical solution, a high-pressure water supply shut-off ball valve and a high-pressure water supply pressure transmitter are sequentially arranged on the high-pressure liquid distribution water supply bus in the liquid flow direction.

[0014] A method for using a fully enclosed instant dissolving and aging mixing and injection process equipment for chemical flooding in offshore oilfields, comprising the following steps:

[0015] (Ⅰ) Ton-bag polymer dry powder is added into a storage tank through an electric feeder, and after the feeding amount is accurately controlled by a screw feeder, it enters the feeding port of a stator-rotor disperser; the low-pressure liquid distribution water supply sent from the platform is filtered through a double water supply filter and then divided into primary water supply and secondary water supply; the primary water supply is metered by a flowmeter and regulated by a regulating valve, and then enters the water inlet of the stator-rotor disperser; the polymer dry powder and the primary water supply sequentially pass through the stator-rotor disperser, an ultrasonic disperser and a low-shear transfer pump to form a polymer stock solution with uniformly dispersed particles, and enter the liquid inlet of an internal component coupling dynamic disperser; the secondary water supply is metered by a flowmeter and regulated by a regulating valve, and then enters the water inlet of the internal component coupling dynamic disperser; the polymer stock solution and the secondary water supply pass through the internal component coupling dynamic disperser to form a uniformly dispersed and preliminarily dissolved polymer mother liquor;

[0016] (Ⅱ) The polymer mother liquor sequentially passes through a high-viscosity and high-efficiency aging device, a high-gravity aging device, a low-shear feeding pump, a tubular cyclone aging device and a double mother liquor filter to form a basically aged polymer mother liquor;

[0017] (Ⅲ) The polymer mother liquor is pressurized by a high-pressure polymer injection pump and deeply aged by a high-pressure tubular cyclone aging device to form a fully aged polymer mother liquor, which is divided into a high-pressure mother liquor for Well No.Ⅰ and a high-pressure mother liquor for Well No.Ⅱ. After being metered by a flowmeter and regulated by a regulating valve respectively, they enter the corresponding liquid inlets of the high-pressure internal component coupling disperser; the high-pressure liquid distribution water supply sent from the platform is divided into high-pressure water supply for Well No.Ⅰ and high-pressure water supply for Well No.Ⅱ. After being metered by a flowmeter and regulated by a regulating valve respectively, they enter the corresponding water inlets of the high-pressure internal component coupling disperser; inside the high-pressure internal component coupling disperser, the high-pressure mother liquor and the high-pressure water supply are diluted, mixed and dispersed in a certain proportion to form a polymer target liquid meeting the injection index requirements, and then injected into the formation reservoir of Well No.Ⅰ or Well No.Ⅱ; according to the requirements of chemical flooding operations, the oil displacement aid passes through the oil displacement aid pipeline and is injected into the formation reservoir along with the polymer mother liquor.

[0018] The beneficial effects of the present invention are:

[0019] The present invention provides a fully enclosed rapid dissolution and aging injection process equipment and its usage method for chemical flooding in offshore oilfields. With a stator-rotor disperser + internal component coupled dynamic disperser + high-viscosity and high-efficiency aging device + high-gravity aging device + high-pressure polymer injection pump as the core, it realizes efficient polymer dispersion, rapid dissolution and aging, and high-pressure injection. The equipment has the characteristics of low carbon, high efficiency, miniaturization, modularization, and distribution, shortening the polymer dissolution and aging time, and achieving the preparation of polymer dry powder into a polymer solution that meets the requirements of the target oilfield reservoir scheme within 10 minutes and injecting it into the formation reservoir, reducing the equipment weight and floor area, increasing the viscosity of the polymer solution and the oil displacement efficiency, and achieving the purpose of chemical flooding and enhanced oil recovery in offshore oilfields under the limited space and load-bearing resource conditions of old platforms. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the fully enclosed rapid dissolution and aging injection process equipment for chemical flooding in offshore oilfields of the present invention;

[0021] Figure 2 is a schematic structural diagram of the high-efficiency dispersion system in the present invention;

[0022] Figure 3 is a schematic structural diagram of the rapid dissolution and aging system in the present invention;

[0023] Figure 4 is a schematic structural diagram of the high-pressure injection system in the present invention;

[0024] Figure 5 is a schematic structural diagram of the stator-rotor disperser in the present invention;

[0025] Figure 6 is a schematic structural diagram of the stator-rotor mechanism of the stator-rotor disperser in the present invention;

[0026] Figure 7 is a schematic structural diagram of the ultrasonic disperser in the present invention;

[0027] Figure 8 is a schematic structural diagram of the internal component coupled dynamic disperser in the present invention;

[0028] Figure 9 is a schematic structural diagram of the fixed flow guide member of the internal component coupled dynamic disperser in the present invention;

[0029] Figure 10 is a schematic structural diagram of the rotating flow guide member of the internal component coupled dynamic disperser in the present invention;

[0030] Figure 11 is a schematic structural diagram of the special-shaped coupling member of the internal component coupled dynamic disperser in the present invention;

[0031] Figure 12 is a schematic structural diagram of the high-viscosity and high-efficiency aging device in the present invention;

[0032] Figure 13 is a schematic structural view of the high-gravity aging reactor in the present invention;

[0033] Figure 14 is a schematic structural view of the liquid distribution mechanism of the high-gravity aging reactor in the present invention;

[0034] Figure 15 is a schematic structural view of the rotating bed of the high-gravity aging reactor in the present invention;

[0035] Figure 16 is a schematic structural view of the tubular cyclone aging reactor in the present invention;

[0036] Figure 17 is a schematic structural view of the static mixer of the tubular cyclone aging reactor in the present invention.

[0037] Wherein:

[0038] 1. High-efficiency dispersion system;

[0039] 11. Storage tank; 12. Water supply double filter; 13. Rotor-stator disperser; 14. Ultrasonic disperser; 15. Inner part coupled dynamic disperser; 16. Low-shear transfer pump; 17. Dry powder feeding hose; 18. Electric feeder; 19. Screw feeder; 110. Dry powder nitrogen pipeline; 111. Low-pressure water supply pipeline; 112. Discharge hose; 113. Primary water supply pipeline; 114. Secondary water supply pipeline; 1101. Pressure transmitter; 1102. Safety valve; 1103. Vent solenoid valve; 1104. High-level transmitter; 1105. Low-level transmitter; 1106. Dry powder nitrogen solenoid valve; 1111. Low-pressure water supply shut-off ball valve; 1112. Water supply pressure transmitter; 1113. Water supply temperature transmitter; 1114. Water supply sampler; 1131. Primary water supply flowmeter; 1132. Primary water supply regulating valve; 1141. Secondary water supply flowmeter; 1142. Secondary water supply regulating valve; 131. Base; 132. Rotor-stator dispersing motor; 133. Rotor-stator dispersing rotating shaft; 134. Transmission belt; 135. Cooling mechanism; 136. Rotor-stator dispersing cavity; 137. Stator assembly; 138. Rotor assembly; 139. Deflector; 1361. Rotor-stator dispersing powder inlet; 1362. Rotor-stator dispersing water inlet; 1363. Rotor-stator dispersing liquid outlet; 141. Ultrasonic generator; 142. Ultrasonic dispersing cavity; 1411. Ultrasonic power supply; 1412. Ultrasonic vibrator; 1421. Ultrasonic dispersing liquid inlet; 1422. Ultrasonic dispersing liquid outlet; 151. Mother liquid check valve; 152. Inner part coupled dynamic dispersing cavity; 153. Inner part coupled dynamic motor; 1521. Fixed deflector; 1522. Rotating deflector; 1523. Inner part coupled dynamic rotating shaft; 1524. Special-shaped coupling part; 1525. Inner part coupled dynamic liquid inlet; 1526. Inner part coupled dynamic water inlet; 1527. Inner part coupled dynamic liquid outlet;

[0040] 2. Instantaneous ripening system;

[0041] 21. High-viscosity and high-efficiency ripening device; 22. High-gravity ripening device; 23. Low-shear feeding pump; 24. Tubular cyclone ripening device; 25. Mother liquor double filter; 26. Nitrogen pipeline of high-viscosity and high-efficiency ripening device; 27. Nitrogen pipeline of high-gravity ripening device; 211. No. I nitrogen solenoid valve; 212. Safety valve of No. I ripening device; 213. Vent solenoid valve of No. I ripening device; 214. Pressure transmitter of No. I ripening device; 215. Liquid level transmitter of No. I; 216. High-efficiency ripening motor; 217. High-efficiency ripening chamber; 2171. No. I spiral belt; 2172. No. II spiral belt; 2173. Screw belt; 2174. Flow guide part; 2175. High-efficiency ripening liquid inlet; 2176. Support partition plate; 2177. High-efficiency ripening rotating shaft; 2178. High-efficiency ripening liquid outlet; 221. No. II nitrogen solenoid valve; 222. Safety valve of No. II ripening device; 223. Vent solenoid valve of No. II ripening device; 224. Pressure transmitter of No. II ripening device; 225. Liquid level transmitter of No. II; 226. High-gravity ripening motor; 227. High-gravity ripening chamber; 2271. High-gravity ripening liquid inlet; 2272. High-gravity ripening liquid outlet; 2273. High-gravity ripening liquid inlet pipeline; 2274. Liquid distribution ring pipe; 2275. Liquid distribution branch pipe; 2276. Outer packing net; 2277. High-gravity ripening rotating shaft; 2278. Rotating bed; 2279. Rotating bed bottom plate; 2280. Reinforcing rib; 2281. Inner packing net; 2282. Middle packing net; 241. Outer shell; 242. Cyclone ripening liquid inlet pipe; 243. Spiral coil; 244. Static mixer; 245. Cyclone ripening liquid outlet pipe; 2431. Coil liquid inlet; 2432. Coil liquid outlet; 2441. Mixing liquid inlet; 2442. No. I diameter-expanding section; 2443. No. I cyclone section; 2444. No. I diameter-reducing section; 2445. No. II diameter-expanding section; 2446. No. II cyclone section; 2447. No. II diameter-reducing section; 2448. Mixing liquid outlet; 251. Mother liquor sampler; 252. On-line mother liquor viscosity detector; 253. Mother liquor pressure transmitter;

[0042] 3. High-pressure injection system;

[0043] 31. High-pressure polymer injection pump; 32. High-pressure tubular swirl ripening device; 33. No. I high-pressure internal component coupling and dispersing device; 34. No. II high-pressure internal component coupling and dispersing device; 35. No. I oil displacement aid pipeline; 36. No. II oil displacement aid pipeline; 37. Branch of No. I high-pressure mother liquor pipeline; 38. Branch of No. II high-pressure mother liquor pipeline; 39. No. I high-pressure water supply pipeline; 310. No. II high-pressure water supply pipeline; 311. Target liquid injection pipeline for Well No. I; 312. Target liquid injection pipeline for Well No. II; 351. Ball valve for oil displacement aid in Well No. I; 361. Ball valve for oil displacement aid in Well No. II; 371. High-pressure mother liquor flowmeter for Well No. I; 372. High-pressure mother liquor regulating valve for Well No. I; 381. High-pressure mother liquor flowmeter for Well No. II; 382. High-pressure mother liquor regulating valve for Well No. II; 3111. Target liquid pressure transmitter for Well No. I; 3112. On-line detector for target liquid viscosity in Well No. I, 3113. Target liquid sampler for Well No. I; 3114. Ball valve for target liquid in Well No. I; 3121. Target liquid pressure transmitter for Well No. II; 3122. On-line detector for target liquid viscosity in Well No. II, 3123. Target liquid sampler for Well No. II; 3124. Ball valve for target liquid in Well No. II;

[0044] 4. Polymer dry powder ton bag;

[0045] 5. Low-pressure liquid preparation water supply source;

[0046] 6. Nitrogen main pipeline;

[0047] 7. High-pressure liquid preparation water supply main line; 71. High-pressure water supply shut-off ball valve; 72. High-pressure water supply pressure transmitter;

[0048] 8. Oil displacement aid main line;

[0049] 9. Well No. I;

[0050] 10. Well No. II.

[0051] For those of ordinary skill in the art, without creative efforts, other related drawings can be obtained based on the above drawings. Detailed implementation manners

[0052] In order to enable the personnel in the technical field to better understand the technical solution of the present invention, the technical solution of the present invention will be further described below in conjunction with the drawings in the specification and through specific implementation manners.

[0053] As Figures 1 to 4 shown, an all-closed rapid dissolution and ripening injection process equipment for chemical flooding in offshore oilfields includes a high-efficiency dispersion system 1, a rapid dissolution and ripening system 2, and a high-pressure injection system 3 that are sequentially connected through inter-skid pipelines;

[0054] The efficient dispersion system 1, the instant ripening system 2, and the high-pressure injection system 3 can be respectively integrated into a skid-mounted module, or can be respectively integrated into multiple small skid-mounted modules according to the installation space of the offshore platform and the requirements of land transportation restrictions. The skid-mounted modules are connected and integrated by pipelines between skids.

[0055] The efficient dispersion system 1 includes a feeding mechanism and a dispersion mechanism that are connected to each other;

[0056] The feeding mechanism includes a polymer dry powder feeding unit and a liquid preparation water feeding unit;

[0057] The polymer dry powder feeding unit includes a storage tank 11 communicated with a polymer dry powder ton bag 4 through a dry powder feeding hose 17. The feeding end of the dry powder feeding hose 17 is inserted into the polymer dry powder ton bag 4. An electric feeder 18 is arranged at the top feeding port of the storage tank 11, and a screw feeder 19 is arranged at the bottom discharging port of the storage tank 11. An air inlet is arranged at the lower part of the storage tank 11, and the air inlet is communicated with a nitrogen main pipeline 6 through a dry powder nitrogen pipeline 110;

[0058] A venting mechanism and a pressure transmitter 1101 are arranged at the top of the storage tank 11. The venting mechanism includes a venting pipeline communicated with the storage tank 11, a safety valve 1102 and a venting solenoid valve 1103 arranged on the venting pipeline, and the venting solenoid valve 1103 is arranged close to the storage tank 11; A high-level transmitter 1104 and a low-level transmitter 1105 are sequentially arranged on the side wall of the storage tank 11 from top to bottom; A dry powder nitrogen solenoid valve 1106 is arranged on the dry powder nitrogen pipeline 110;

[0059] The liquid preparation water feeding unit includes a water supply double filter 12. The water inlet of the water supply double filter 12 is communicated with a low-pressure liquid preparation water supply source 5 through a low-pressure water supply pipeline 111;

[0060] A low-pressure water supply shut-off ball valve 1111, a water supply pressure transmitter 1112, a water supply temperature transmitter 1113, and a water supply sampler 1114 are sequentially arranged on the low-pressure water supply pipeline 111 in the direction of tap water;

[0061] The dispersion mechanism includes a stator-rotor disperser 13, an ultrasonic disperser 14, and an internal part coupled dynamic disperser 15 that are sequentially communicated through a stock solution pipeline; A low-shear transfer pump 16 is arranged on the stock solution pipeline between the ultrasonic disperser 14 and the internal part coupled dynamic disperser 15;

[0062] The stator-rotor dispersion powder inlet 1361 of the stator-rotor disperser 13 is communicated with the discharging port of the screw feeder 19 through a feeding hose 112; The stator-rotor dispersion water inlet 1362 of the stator-rotor disperser 13 is communicated with the water outlet of the water supply double filter 12 through a primary water supply pipeline 113;

[0063] The ultrasonic dispersion liquid inlet 1421 of the ultrasonic disperser 14 is communicated with the stator-rotor dispersion liquid outlet 1363 of the stator-rotor disperser 13, and the ultrasonic dispersion liquid outlet 1422 of the ultrasonic disperser 14 is communicated with the liquid inlet of the low-shear transfer pump 16;

[0064] The inner-piece coupling dynamic inlet of the inner-piece coupling dynamic disperser 15 is communicated with the liquid outlet of the low-shear transfer pump 16, and the inner-piece coupling dynamic water inlet of the inner-piece coupling dynamic disperser 15 is communicated with the water outlet of the water supply double filter 12 through the secondary water supply pipeline 114;

[0065] An primary water supply flowmeter 1131 and a primary water supply regulating valve 1132 are sequentially arranged on the primary water supply pipeline 113 in the direction of tap water;

[0066] A secondary water supply flowmeter 1141 and a secondary water supply regulating valve 1142 are sequentially arranged on the secondary water supply pipeline 114 in the direction of tap water;

[0067] The inner-piece coupling dynamic liquid outlet 1527 of the inner-piece coupling dynamic disperser 15 is communicated with the mother liquor pipeline. A mother liquor one-way valve 151 is arranged on the mother liquor pipeline, and the other end of the mother liquor pipeline is communicated with the instant dissolution and aging system 2 through the pipeline between skids;

[0068] In this embodiment, the structure of the stator-rotor disperser 13 is as Figure 5 、 6 shown. It includes a base 131, a driving mechanism, a cooling mechanism 135 and a dispersion mechanism; the base 131 is a hollow structure; the driving mechanism includes a stator-rotor dispersion motor 132, a stator-rotor dispersion rotating shaft 133 and a transmission belt 134; the output shaft of the stator-rotor dispersion motor 132 extends into the base 131, and a driving wheel is sleeved outside the output shaft; one end of the stator-rotor disperser rotating shaft 133 is inserted into the base 131, and the other end passes through the cooling mechanism 135 and then is inserted into the dispersion mechanism; a driven wheel is sleeved outside the shaft of the stator-rotor dispersion rotating shaft 133 placed in the base 131; the transmission belt 134 is sleeved on the driving wheel and the driven wheel to realize the rotation of the motor driving the rotating shaft; the dispersion mechanism is arranged on the top of the cooling mechanism 135, and a mechanical seal is arranged between the two; the dispersion mechanism includes a stator-rotor dispersion chamber 136 and a stator-rotor mechanism arranged inside the stator-rotor dispersion chamber 136;

[0069] At the middle of the top of the stator-rotor dispersion chamber 136, a stator-rotor dispersion powder inlet 1361 is provided. At the upper part of the side wall of the stator-rotor dispersion chamber 136, a stator-rotor dispersion water inlet 1362 is provided. At the lower part of the side wall of the stator-rotor dispersion chamber 136, a stator-rotor dispersion liquid outlet 1363 is provided. The stator-rotor dispersion water inlet 1362 is arranged above the stator-rotor mechanism, and the stator-rotor dispersion liquid outlet 1363 is arranged below the stator-rotor mechanism. The stator-rotor mechanism includes a stator assembly 137 and a rotor assembly 138. The stator assembly 137 includes a base ring and a plurality of stator teeth (32 are provided in this embodiment) evenly distributed along the inner circumferential wall of the base ring, and the tips of the stator teeth face downward. The rotor assembly 138 includes a base disk and a plurality of rotor teeth (32 rotor teeth are provided in this embodiment) evenly distributed along the edge of the base disk on the top surface of the base disk, and the tips of the rotor teeth face upward. A plurality of guide vanes 139 (3 are provided in this embodiment) are evenly distributed on the top surface of the base disk of the rotor assembly. The guide vanes 139 are bent in an arc shape. The guide vanes 139 are arranged inside the ring formed by the rotor teeth. The top of the stator-rotor dispersion rotating shaft 133 is fixedly connected to the center of the base disk of the rotor assembly 138;

[0070] In this embodiment, the structure of the ultrasonic disperser 14 is as Figure 7 shown, which includes an ultrasonic generator 141 and an ultrasonic dispersion chamber 142. The ultrasonic generator 141 includes an ultrasonic power supply 1411 and an ultrasonic vibrator 1412 which are connected to each other. The ultrasonic vibrator 1412 is inserted into the ultrasonic dispersion chamber 142 from the top, and a mechanical seal is provided between the ultrasonic vibrator 1412 and the ultrasonic dispersion chamber 142. An ultrasonic dispersion liquid inlet 1421 is provided at the lower part of the side wall of the ultrasonic dispersion chamber 142, and an ultrasonic dispersion liquid outlet 1422 is provided at the upper part of the side wall of the ultrasonic dispersion chamber 142;

[0071] In this embodiment, the structure of the inner member coupling dynamic disperser 15 is as Figures 8 to 11As shown in the figure, it includes an inner component coupled dynamic dispersion chamber 152 and an inner component coupled dynamic motor 153 disposed on the top of the inner component coupled dynamic dispersion chamber 152. A mechanical seal is provided between the inner component coupled dynamic motor 153 and the inner component coupled dynamic dispersion chamber 152; the output shaft of the inner component coupled dynamic motor 153 extends into the inner component coupled dynamic dispersion chamber 152, and the output shaft is fixedly connected to the inner component coupled dynamic rotating shaft 1523; a plurality of fixed flow guiding members 1521 are provided on the inner wall of the inner component coupled dynamic dispersion chamber 152, and a plurality of rotating flow guiding members 1522 and a special-shaped coupling member 1524 are provided on the inner component coupled dynamic rotating shaft 1523; the fixed flow guiding members 1521 and the rotating flow guiding members 1522 are arranged alternately, and the special-shaped coupling member 1524 is arranged in the middle; the fixed flow guiding member 1521 is in a ring shape, and a plurality of evenly distributed fan-shaped holes are formed thereon. The inner component coupled dynamic rotating shaft 1523 passes through the central hole of the ring, and the outer circumferential wall of the ring is fixedly connected to the inner wall of the inner component coupled dynamic dispersion chamber 152; the rotating flow guiding member 1522 includes an inner ring and a plurality of fan blades evenly distributed along the outer circumference of the inner ring. The inner ring is sleeved on the inner component coupled dynamic rotating shaft 1523; the special-shaped coupling member 1524 includes an inner sleeve and two polyhedrons symmetrically arranged on the outer wall of the inner sleeve; an inner component coupled dynamic liquid inlet 1525 and an inner component coupled dynamic water inlet 1526 are provided on the lower outer wall of the inner component coupled dynamic dispersion chamber 152, and an inner component coupled dynamic liquid outlet 1527 is provided on the upper outer wall of the inner component coupled dynamic dispersion chamber 152;

[0072] In this embodiment, 4 fixed flow guiding members 1521 are provided on the inner wall of the inner component coupled dynamic dispersion chamber 152, 2 are provided on the upper inner wall, and 2 are provided on the lower inner wall; 4 rotating flow guiding members 1522 are provided on the inner component coupled dynamic rotating shaft 1523. The 2 rotating flow guiding members 1522 above are arranged alternately with the 2 fixed flow guiding members 1521 on the upper part, and the 2 rotating flow guiding members 1522 below are arranged alternately with the 2 fixed flow guiding members 1521 on the lower part. The special-shaped coupling member 1524 is arranged between the upper and lower 2 groups of flow guiding members;

[0073] The instant dissolving and ripening system 2 includes a high-viscosity and high-efficiency ripening device 21, a high-gravity ripening device 22, a low-shear feeding pump 23, a tubular cyclone ripening device 24, and a mother liquor duplex filter 25 that are sequentially connected through a mother liquor pipeline;

[0074] The liquid inlet of the high-viscosity and high-efficiency ripening device 21 is connected to the mother liquor pipeline, and the other end of the mother liquor pipeline is connected to the pipeline between the skids between the high-efficiency dispersion system 1 and the instant dissolving and ripening system 2;

[0075] A venting mechanism for the ripening device is provided at the top of the high-viscosity and high-efficiency ripening device 21. The venting mechanism for the ripening device includes a venting pipeline communicated with the high-viscosity and high-efficiency ripening device 21, and a No. I ripening device safety valve 212, a No. I ripening device venting solenoid valve 213, and a No. I ripening device pressure transmitter 214 arranged on the venting pipeline in sequence from top to bottom; a No. I liquid level transmitter 215 is arranged at the liquid inlet of the bottom of the high-viscosity and high-efficiency ripening device 21;

[0076] The high-viscosity and high-efficiency ripening device 21 is provided with an air inlet, and the air inlet is communicated with the nitrogen gas main pipeline 6 through the nitrogen gas pipeline 26 of the high-viscosity and high-efficiency ripening device. A No. I nitrogen gas solenoid valve 211 is arranged on the nitrogen gas pipeline 26 of the high-viscosity and high-efficiency ripening device;

[0077] A venting mechanism for the high-gravity ripening device is provided at the top of the high-gravity ripening device 22. The venting mechanism for the high-gravity ripening device includes a venting pipeline communicated with the high-gravity ripening device 22, and a No. II ripening device safety valve 222, a No. II ripening device venting solenoid valve 223, and a No. II ripening device pressure transmitter 224 arranged on the venting pipeline in sequence from top to bottom; a No. II liquid level transmitter 225 is arranged at the bottom of the high-gravity ripening device 22;

[0078] The high-gravity ripening device 22 is provided with an air inlet, and the air inlet is communicated with the nitrogen gas main pipeline 6 through the nitrogen gas pipeline 27 of the high-gravity ripening device. A No. II nitrogen gas solenoid valve 221 is arranged on the nitrogen gas pipeline 27 of the high-gravity ripening device;

[0079] On the mother liquid pipeline at the liquid outlet of the high-gravity ripening device 22, a mother liquid sampler 251, an on-line mother liquid viscosity detector 252, and a mother liquid pressure transmitter 253 are arranged in sequence along the liquid flow direction;

[0080] In this embodiment, the structure of the high-viscosity and high-efficiency ripening device 21 is as shown in Figure 12As shown in the figure, it includes an efficient aging chamber 217 and an efficient aging motor 216 arranged at the top of the efficient aging chamber 217. An efficient aging rotating shaft 2177 is arranged inside the efficient aging chamber 217. The efficient aging rotating shaft 2177 is connected to the output shaft of the efficient aging motor 216, and a mechanical seal is arranged between the two. A flow guiding member 2174 is arranged at the bottom end of the efficient aging rotating shaft 2177. The outside of the efficient aging rotating shaft 2177 is wound with a No. I spiral belt 2171, a No. II spiral belt 2172 and a screw belt 2173. The bottom ends of the No. I spiral belt 2171 and the No. II spiral belt 2172 are connected to the flow guiding member 2174, and the bottom end of the screw belt 2173 is connected to the bottom end of the efficient aging rotating shaft 2177. The No. I spiral belt 2171 and the No. II spiral belt 2172 are sequentially connected to a plurality of support partition plates 2176 along the spiral upward direction. The support partition plates 2176 are circular and sleeved outside the efficient aging device rotating shaft 2177. The uppermost support partition plate 2176 is connected to the top ends of the No. I spiral belt 2171 and the No. II spiral belt 2172, and the top end of the screw belt 2173 is connected to the uppermost support partition plate 2176. An efficient aging liquid inlet 2175 is arranged at the bottom of the efficient aging chamber 217, and an efficient aging liquid outlet 2178 is arranged at the upper part of its side wall.

[0081] In this embodiment, the structure of the high gravity aging device 22 is as Figure 13 、 14As shown in FIGS. 15, it includes a supergravity aging chamber 227 and a supergravity aging motor 226 disposed at the top of the supergravity aging chamber 227. A supergravity aging rotating shaft 2277 is disposed inside the supergravity aging chamber 227. The output shaft of the supergravity aging motor 226 is connected to the supergravity aging rotating shaft 2277, and a mechanical seal is provided therebetween; an upper portion of the side wall of the supergravity aging chamber 227 is provided with a supergravity aging liquid inlet 2271, and its bottom is provided with a supergravity aging liquid outlet 2272; a liquid distribution mechanism and a rotating bed 2278 are disposed inside the supergravity aging chamber 227; the liquid distribution mechanism includes a liquid inlet pipeline 2273 communicated with the supergravity aging liquid inlet 2271, a liquid distribution ring pipe 2274 communicated with the liquid inlet pipeline 2273, and a plurality of liquid distribution branch pipes 2275 communicated with the liquid distribution ring pipe 2274; the liquid distribution ring pipe 2274 is fixed to the inner top surface of the supergravity aging chamber 227 through a fixing member; the supergravity aging rotating shaft 2277 passes through the middle of the liquid distribution ring pipe 2274; the liquid distribution branch pipes 2275 are vertically disposed; in this embodiment, 6 liquid distribution branch pipes 2275 are provided, and every 3 branch pipes are in a group, and their lengths increase in sequence; the liquid distribution branch pipes 2275 are inserted into the rotating bed 2278; the rotating bed 2278 includes a rotating bed bottom plate 2279 and a filler mesh group; the bottom end of the filler mesh group is connected to the rotating bed bottom plate 2279, and the center of the rotating bed bottom plate 2279 is fixedly connected to the bottom end of the supergravity aging rotating shaft 2277; the filler mesh group includes an inner layer filler mesh 2281, a middle layer filler mesh 2282, and an outer layer filler mesh 2276 which are sleeved in sequence from inside to outside; reinforcing ribs 2280 are provided between the inner layer filler mesh 2281 and the middle layer filler mesh 2282 and between the middle layer filler mesh 2282 and the outer layer filler mesh 2276;

[0082] In this embodiment, the structure of the tubular cyclone aging device 24 is as shown in Figure 16 、 17As shown in the figure, it includes a housing 241, a static mixer 244 arranged inside the housing 241, and a spiral coiled pipe 243 wound around the outside of the static mixer 244; a swirling ripening liquid outlet pipe 245 is arranged at the top of the housing 241, and a swirling ripening liquid inlet pipe 242 is arranged at the upper part of the side wall of the housing 241; the coiled pipe liquid inlet 2431 of the spiral coiled pipe 243 is connected to the swirling ripening liquid inlet pipe 242; the coiled pipe liquid outlet 2432 of the spiral coiled pipe 243 is connected to the mixing liquid inlet 2441 of the static mixer 244; the mixing liquid outlet 2448 of the static mixer 244 is connected to the swirling ripening liquid outlet pipe 245; the static mixer 244 is a cylinder with a cavity structure formed in the middle, the mixing liquid outlet 2448 is arranged at the top of the static mixer 244, and the mixing liquid inlet 2441 is arranged at the bottom; the cavity structure is composed of two vertically connected shuttle-shaped cavities, the upper and lower variable-diameter ends of the lower shuttle-shaped cavity respectively form a No. I enlarged diameter section 2442 and a No. I reduced diameter section 2444, a spiral plate is arranged in the middle of the lower shuttle-shaped cavity to form a No. I swirling section 2443; the upper and lower variable-diameter ends of the upper shuttle-shaped cavity respectively form a No. II enlarged diameter section 2445 and a No. II reduced diameter section 2447, a spiral plate is arranged in the middle of the upper shuttle-shaped cavity to form a No. II swirling section 2446;

[0083] The high-pressure injection system 3 includes a high-pressure polymer injection pump 31, a high-pressure tubular swirling ripening device 32, a No. I high-pressure inner part coupling and dispersing device 33, and a No. II high-pressure inner part coupling and dispersing device 34 that are connected in sequence;

[0084] The liquid inlet of the high-pressure polymer injection pump 31 is communicated with the pipeline between the quick-dissolving ripening system 2 and the high-pressure injection system 3 through the mother liquid pipeline, and the liquid outlet of the high-pressure polymer injection pump 31 is communicated with the liquid inlet of the high-pressure tubular swirling ripening device 32 through the high-pressure mother liquid pipeline; the liquid outlet of the high-pressure tubular swirling ripening device 32 is respectively communicated with the liquid inlets of the No. I high-pressure inner part coupling and dispersing device 33 and the No. II high-pressure inner part coupling and dispersing device 34 through a No. I high-pressure mother liquid pipeline branch 37 and a No. II high-pressure mother liquid pipeline branch 38;

[0085] A No. I well high-pressure mother liquid flowmeter 371 and a No. I well high-pressure mother liquid regulating valve 372 are arranged on the No. I high-pressure mother liquid pipeline branch 37;

[0086] A No. II well high-pressure mother liquid flowmeter 381 and a No. II well high-pressure mother liquid regulating valve 382 are arranged on the No. II high-pressure mother liquid pipeline branch 38;

[0087] The liquid inlet of the No. I high-pressure inner part coupling and dispersing device 33 is connected to the oil displacement aid main line 8 through a No. I oil displacement aid pipeline 35; the water inlet of the No. I high-pressure inner part coupling and dispersing device 33 is connected to the high-pressure liquid distribution water supply main line 7 through a No. I high-pressure water supply pipeline 39; the liquid outlet of the No. I high-pressure inner part coupling and dispersing device 33 is connected to the No. I well 9 through a No. I well target liquid injection pipeline 311;

[0088] A No. I oil displacement aid pipeline 35 is provided with a No. I well oil displacement aid ball valve 351;

[0089] On the No. I high-pressure water supply pipeline 39, a No. I well high-pressure water supply flowmeter 391 and a No. I well high-pressure water supply regulating valve 392 are arranged in sequence along the liquid flow direction;

[0090] On the No. I well target liquid injection pipeline 311, a No. I well target liquid pressure transmitter 3111, a No. I well target liquid viscosity on-line detector 3112, a No. I well target liquid sampler 3113 and a No. I well target liquid ball valve 3114 are arranged in sequence along the liquid flow direction;

[0091] The liquid inlet of the No. II high-pressure inner part coupling and dispersing device 34 is connected to the oil displacement aid main line 8 through a No. II oil displacement aid pipeline 36; the water inlet of the No. I high-pressure inner part coupling and dispersing device 33 is connected to the high-pressure liquid mixing water supply main line 7 through a No. II high-pressure water supply pipeline 310; the liquid outlet of the No. II high-pressure inner part coupling and dispersing device 34 is connected to a No. II well 10 through a No. II well target liquid injection pipeline 312;

[0092] The No. II oil displacement aid pipeline 36 is provided with a No. II well oil displacement aid ball valve 361;

[0093] The No. II high-pressure water supply pipeline 310 is provided with a No. II well high-pressure water supply flowmeter 3101 and a No. II well high-pressure water supply regulating valve 3102;

[0094] The No. II well target liquid injection pipeline 312 is provided with a No. II well target liquid pressure transmitter 3121, a No. II well target liquid viscosity on-line detector 3122 / a No. II well target liquid sampler 3123 and a No. II well target liquid ball valve 3124;

[0095] On the high-pressure liquid mixing water supply main line 7, a high-pressure water supply shut-off ball valve 71 and a high-pressure water supply pressure transmitter 72 are arranged in sequence along the liquid flow direction.

[0096] Example 2

[0097] A full-closed instant dissolving and aging liquid mixing and injection process equipment and usage method for chemical flooding in an offshore oilfield as described in Example 1, specifically:

[0098] In the high-efficiency dispersion system 1, the polymer dry powder contained in the polymer dry powder ton bag 4 is added to the storage tank 11 through the electric feeder 18. After the feeding amount is precisely controlled by the screw feeder 19, it enters the feed port of the stator-rotor disperser 13 along the feeding hose 112. The low-pressure liquid supply water 5 sent by the platform passes through the low-pressure water supply shut-off ball valve 1111 and the water supply double filter 12 along the low-pressure water supply pipeline 111, and is divided into primary water supply and secondary water supply, which enter the primary water supply pipeline 113 and the secondary water supply pipeline 114 respectively. The primary water supply enters the water inlet of the stator-rotor disperser 13 after being metered by the flowmeter 1131 and adjusted by the regulating valve 1132; inside the stator-rotor disperser 13, the rotor rotates at a high speed of 2900 rpm. In the narrow gap between the stator and the rotor, shear, extrusion, grinding, and cavitation effects are generated on the polymer dry powder and the primary water supply, forming a polymer stock solution with uniformly dispersed particles, which enters the ultrasonic disperser 14 along the stock solution pipeline. Inside the ultrasonic disperser 14, the ultrasonic oscillator generates ultrasonic waves with a frequency of 20 KHz, which generate cavitation and vibration effects on the polymer stock solution, forming a polymer stock solution with secondary dispersion, which enters the low-shear transfer pump 16 along the stock solution pipeline, and is pressurized to 0.3 MPa and then enters the liquid inlet of the internal component coupling dynamic disperser 15. The secondary water supply enters the water inlet of the internal component coupling dynamic disperser 15 after being metered by the flowmeter 1141 and adjusted by the regulating valve 1142. Inside the internal component coupling dynamic disperser 15, the rotor rotates at a speed of 1450 rpm, diluting, mixing, and performing tertiary dispersion on the polymer stock solution and the secondary water supply, forming a uniformly dispersed and preliminarily dissolved polymer mother liquor, which enters the instant dissolution and ripening system 2 along the mother liquor pipeline and the pipeline between skids.

[0099] In the instant dissolution and ripening system 2, the polymer mother liquor enters from the bottom liquid inlet of the high-viscosity and high-efficiency ripening device 21 along the mother liquor pipeline. Inside the high-viscosity and high-efficiency ripening device 21, the screw-ribbon agitator rotates at a speed of 150 rpm, and the polymer mother liquor undergoes primary ripening during the upward flow from the bottom. After flowing out from the top liquid outlet, it enters the top liquid inlet of the high-gravity ripening device 22 along the mother liquor pipeline. Inside the high-gravity ripening device 22, the polymer mother liquor is first evenly distributed by the liquid distributor and then enters the packed rotating bed rotating at a speed of 800 rpm. The polymer mother liquor undergoes secondary ripening under the action of centrifugal force. After flowing out from the bottom liquid outlet, it enters the low-shear feeding pump 23 along the mother liquor pipeline, is pressurized to 0.3 MPa, and then enters the upper liquid inlet of the tubular cyclone ripening device 24. Inside the tubular cyclone ripening device 24, the polymer mother liquor flows downward along the outer spiral and enters the inlet of the static mixer in the inner layer from the bottom outlet, and then flows upward. During the flow inside the tubular cyclone ripening device 24, the polymer mother liquor undergoes tertiary ripening under the action of centrifugal force, and then enters the mother liquor double filter 25 through the upper liquid outlet along the mother liquor pipeline. After the mother liquor double filter 25 filters out the insoluble substances and impurities in the polymer mother liquor, a basically ripened polymer mother liquor is formed and enters the high-pressure injection system 3 along the mother liquor pipeline and the pipeline between skids.

[0100] In the high-pressure injection system 3, the polymer mother liquor enters the high-pressure polymer injection pump 31 along the mother liquor pipeline. After being pressurized to the pressure value designed for the injection well, it enters the upper liquid inlet of the high-pressure tubular cyclone ripening device 32 along the high-pressure mother liquor pipeline. The internal structure and function of the high-pressure tubular cyclone ripening device 32 are basically the same as those of the tubular cyclone ripening device 24. The high-pressure polymer mother liquor is deeply ripened under the action of centrifugal force to form a fully ripened polymer mother liquor, which flows out through the upper liquid outlet and is divided into the high-pressure mother liquor for Well No. I and the high-pressure mother liquor for Well No. II along the high-pressure mother liquor pipeline, and then enters the high-pressure mother liquor pipeline 37 for Well No. I and the high-pressure mother liquor pipeline 38 for Well No. II respectively. The high-pressure mother liquor for Well No. I enters the liquid inlet of the high-pressure internal component coupling and dispersing device 33 for Well No. I after being metered by the flowmeter 371 and adjusted by the regulating valve 372. The high-pressure liquid supply for liquid preparation sent from the platform enters the high-pressure water supply pipeline 39 for Well No. I and the high-pressure water supply pipeline 310 for Well No. II respectively after passing through the high-pressure water supply shut-off ball valve 71 along the high-pressure liquid supply for liquid preparation main line 7. The high-pressure water supply for Well No. I enters the water inlet of the high-pressure internal component coupling and dispersing device 33 for Well No. I after being metered by the flowmeter 391 and adjusted by the regulating valve 392. Inside the high-pressure internal component coupling and dispersing device 33 for Well No. I, the high-pressure mother liquor and the high-pressure water supply are diluted, mixed and dispersed in a certain proportion to form a target liquid that meets the injection index requirements of Well No. I. After flowing out through the liquid outlet, it is injected into the formation reservoir of Well No. I along the target liquid injection pipeline 311 for Well No. I and through the target liquid ball valve 3114 for Well No. I. According to the requirements of chemical flooding operations, the oil displacement aid is injected into the high-pressure mother liquor pipeline 37 for Well No. I through the oil displacement aid main pipeline 8, the oil displacement aid pipeline 35 for Well No. I and the oil displacement aid ball valve 351 for Well No. I, and is injected into the formation reservoir of Well No. I along with the polymer mother liquor. The method and process for preparing and injecting the target liquid for Well No. II are exactly the same as those for Well No. I.

[0101] During the preparation and injection of the polymer solution, methods such as nitrogen replacement for oxygen isolation and full-process sealing are adopted.

[0102] When the polymer level in the storage tank 11 drops to the set value of the low-level transmitter 1105, the electric feeder 18 is started to add the polymer dry powder in the polymer dry powder ton bag 4 into the storage tank 11; when the polymer level reaches the set value of the high-level transmitter 1104, the electric feeder 18 is stopped to complete the feeding process. At the start of feeding, the vent solenoid valve 1102 is opened, and the air accompanying the polymer dry powder entering the storage tank 11 flows out through the vent solenoid valve 1102; after feeding is completed, the nitrogen solenoid valve 1106 is opened to supplement nitrogen into the storage tank 11 to dry the polymer dry powder and displace the internal air, which flows out through the opened vent solenoid valve 1102; after 5 minutes, the nitrogen displacement is completed, the vent solenoid valve 1102 is closed, and nitrogen is continuously supplemented into the storage tank 11; when the pressure transmitter 1101 reaches the set upper limit value of 50 KPa, the nitrogen solenoid valve 1106 is closed, and the storage tank 11 is in a slightly positive pressure state; as the feeding proceeds, the internal pressure of the storage tank 11 gradually decreases; when the pressure transmitter 1101 reaches the set lower limit value of 10 KPa, the nitrogen solenoid valve 1106 is opened to supplement nitrogen until the pressure transmitter 1101 reaches the pressure-holding set value of 40 KPa, and then the nitrogen solenoid valve 1106 is closed, and the storage tank 11 is in a slightly positive pressure state, and such cyclic operation is performed. If the vent solenoid valve 1102 fails, when the internal pressure of the storage tank 11 reaches the opening set value of the safety valve 1103 of 60 KPa, the safety valve 1103 automatically opens for venting; when the internal pressure drops to the closing set value of the safety valve 1103 of 30 KPa, the safety valve 1103 automatically closes.

[0103] During the operation of the high-viscosity and high-efficiency ripening device 21 and the rotating packed bed ripening device 22, the method of nitrogen displacement for oxygen isolation and sealed pressure maintenance is also adopted. Taking the high-viscosity and high-efficiency ripening device 21 as an example for description. Nitrogen flows along the nitrogen main pipeline 6, the nitrogen pipeline of the high-viscosity and high-efficiency ripening device 26 and the opened nitrogen solenoid valve 211, and enters from the top air inlet of the high-viscosity and high-efficiency ripening device 21 to displace gases such as oxygen and hydrogen sulfide released from the prepared liquid water, and is vented through the opened vent solenoid valve 213; when the pressure transmitter 214 reaches the set lower limit value of 0.1 MPa, the vent solenoid valve 213 is closed, and nitrogen continues to be supplemented into the high-viscosity and high-efficiency ripening device 21; when the pressure transmitter 214 reaches the pressure-holding set value of 0.3 MPa, the nitrogen solenoid valve 211 is closed, and the high-viscosity and high-efficiency ripening device 21 enters the sealed pressure-maintaining state; as the gases released from the prepared liquid water continuously accumulate and increase or the internal liquid level rises, the pressure will continuously increase; when the pressure transmitter 214 reaches the set upper limit value of 0.5 MPa, the vent solenoid valve 213 is opened, and such cyclic operation is performed. If the vent solenoid valve 213 fails, when the internal pressure of the high-viscosity and high-efficiency ripening device 21 reaches the opening set value of the safety valve 212 of 0.6 MPa, the safety valve 212 automatically opens for venting; when the internal pressure value drops to the closing set value of the safety valve 212 of 0.3 MPa, the safety valve 212 automatically closes.

[0104] During the preparation and injection of the polymer solution, the water supply pressure transmitter 1112 and the water supply temperature transmitter 1113 monitor the low-pressure liquid preparation water supply pressure and temperature in real time. The water supply sampler 1114 is used to take manual samples at regular intervals to analyze the water quality indicators of the low-pressure liquid preparation water supply through chemical tests; the No. I liquid level transmitter 215 and the No. II liquid level transmitter 225 monitor the liquid levels of the high-viscosity and high-efficiency ripening tank 21 and the high-gravity ripening tank 22 in real time respectively; the mother liquor pressure transmitter 253 and the on-line mother liquor viscosity detector 252 monitor the mother liquor pressure and viscosity in real time respectively. The mother liquor sampler 251 is used to take manual samples at regular intervals to analyze the mother liquor viscosity through chemical tests.

[0105] The high-pressure water supply pressure transmitter 72 monitors the high-pressure liquid preparation water supply pressure in real time; the No. I well target liquid pressure transmitter 3111 and the on-line No. I well target liquid viscosity detector 3112 monitor the No. I well target liquid pressure and viscosity in real time respectively. The No. I well target liquid sampler 3113 is used to take manual samples at regular intervals to analyze the No. I well target liquid viscosity through chemical tests; the No. II well target liquid pressure transmitter 3121 and the on-line No. II well target liquid viscosity detector 3122 monitor the No. II well target liquid pressure and viscosity in real time respectively. The No. II well target liquid sampler 3123 is used to take manual samples at regular intervals to analyze the No. II well target liquid viscosity through chemical tests. The low-pressure water supply shut-off ball valve 1111 and the high-pressure water supply shut-off ball valve 72 achieve the emergency shut-off of the low-pressure water supply and the high-pressure water supply respectively.

[0106] The present invention takes the stator-rotor disperser + internal component coupled dynamic disperser + high-viscosity and high-efficiency ripening tank + high-gravity ripening tank + high-pressure polymer injection pump as the core to achieve the high-efficiency dispersion, rapid dissolution and ripening, and high-pressure injection of the polymer. The dissolution and ripening time is shortened from 30 minutes to less than 10 minutes, and the viscosity retention rate is over 90%. The floor area of the whole set of equipment is reduced by more than 20%, and the operating weight is reduced by more than 40%, improving the dissolution and ripening efficiency of the polymer mother liquor and the equipment utilization rate; adopting nitrogen replacement for oxygen isolation and fully enclosed process to improve the viscosity of the polymer solution and the oil displacement efficiency; adopting miniaturized, modular, distributed and containerized skid-mounted design, with a compact structure, which is more conducive to land transportation and improves the utilization rate of platform space resources.

[0107] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more.

[0108] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

[0109] The applicant declares that the above description is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by any person skilled in the art within the technical scope disclosed by the present invention fall within the protection scope and the disclosure scope of the present invention.

Claims

1. A fully enclosed rapid dissolution and maturation injection process equipment for offshore oilfield chemical flooding, characterized by: It comprises a high-efficiency dispersion system (1), a quick dissolving and maturing system (2) and a high-pressure injection system (3) which are sequentially connected through pipelines between skids; The efficient dispersion system (1) comprises a feeding mechanism and a dispersion mechanism connected to each other; The feeding mechanism includes a polymer dry powder feeding unit and a liquid water feeding unit; The instant aging system (2) comprises a high-viscosity and high-efficiency aging device (21), a supergravity aging device (22), a low-shear feeding pump (23), a tubular cyclone aging device (24) and a mother liquor double filter (25) which are sequentially connected through a mother liquor pipeline; The high-pressure injection system (3) comprises a high-pressure injection polymer pump (31), a high-pressure tubular cyclone maturator (32), a No. I high-pressure internal coupled disperser (33) and a No. II high-pressure internal coupled disperser (34) which are connected in sequence.

2. The fully enclosed rapid dissolution and maturation injection process equipment for offshore oilfield chemical flooding according to claim 1 is characterized in that: The polymer dry powder feeding unit comprises a storage tank (11) connected to a polymer dry powder ton bag (4) via a dry powder feeding hose (17), the feeding end of the dry powder feeding hose (17) is inserted into the polymer dry powder ton bag (4), an electric feeder (18) is arranged at the top feeding port of the storage tank (11), a screw feeder (19) is arranged at the bottom discharge port of the storage tank (11), an air inlet is arranged at the lower part of the storage tank (11), and the air inlet is connected to the nitrogen main pipeline (6) via a dry powder nitrogen pipeline (110). The liquid preparation water supply unit comprises a water supply double filter (12), the water inlet of the water supply double filter (12) is connected to the low-pressure liquid preparation water supply source (5) through a low-pressure water supply pipeline (111); the dispersion mechanism comprises a stator-rotor disperser (13), an ultrasonic disperser (14) and an internal coupled dynamic disperser (15) which are sequentially connected through a raw liquid pipeline; a low shear delivery pump (16) is arranged on the raw liquid pipeline between the ultrasonic disperser (14) and the internal coupled dynamic disperser (15).

3. The fully enclosed rapid dissolution and maturation injection process equipment for offshore oilfield chemical flooding according to claim 2 is characterized by: A venting mechanism and a pressure transmitter (1101) are arranged on the top of the material storage tank (11), the venting mechanism comprising a venting pipeline connected to the material storage tank (11) and a safety valve (1102) and a venting solenoid valve (1103) arranged on the venting pipeline, and the venting solenoid valve (1103) is arranged close to the material storage tank (11); a high material level transmitter (1104) and a low material level transmitter (1105) are arranged on the side wall of the material storage tank (11) in sequence from top to bottom; and a dry powder nitrogen solenoid valve (1106) is arranged on the dry powder nitrogen pipeline (110).

4. The fully enclosed rapid dissolution and maturation injection process equipment for offshore oilfield chemical flooding according to claim 2 is characterized in that: A low-pressure water supply shutoff ball valve (1111), a water supply pressure transmitter (1112), a water supply temperature transmitter (1113) and a water supply sampler (1114) are sequentially arranged on the tap water direction of the low-pressure water supply pipeline (111).

5. The fully enclosed rapid dissolution and maturation injection process equipment for offshore oilfield chemical flooding according to claim 2 is characterized in that: The feed port of the stator-rotor disperser (13) is communicated with the discharge port of the screw feeder (19) through a feed hose (112); the water inlet of the stator-rotor disperser (13) is communicated with the water outlet of the water supply duplex filter (12) through a primary water supply pipeline (113); the liquid inlet of the ultrasonic disperser (14) is communicated with the liquid outlet of the stator-rotor disperser (13), and the liquid outlet of the ultrasonic disperser (14) is communicated with the liquid inlet of the low shear delivery pump (16); the liquid inlet No. Ⅰ of the internal coupled dynamic disperser (15) is communicated with the liquid outlet of the low shear delivery pump (16), and the liquid inlet No. Ⅱ of the internal coupled dynamic disperser (15) is communicated with the liquid outlet of the low shear delivery pump (16). The liquid inlet is connected to the water outlet of the water supply double filter (12) through a secondary water supply pipeline (114); a primary water supply flow meter (1131) and a primary water supply regulating valve (1132) are sequentially arranged on the primary water supply pipeline (113) in the direction of tap water; a secondary water supply flow meter (1141) and a secondary water supply regulating valve (1142) are sequentially arranged on the secondary water supply pipeline (114) in the direction of tap water; the liquid outlet of the internal coupling dynamic disperser (15) is connected to a mother liquid pipeline, a mother liquid one-way valve (151) is arranged on the mother liquid pipeline, and the other end of the mother liquid pipeline is connected to the instant aging system (2) through a skid pipeline.

6. The fully enclosed rapid dissolution and maturation injection process equipment for offshore oilfield chemical flooding according to claim 1 is characterized by: A maturation device venting mechanism is arranged at the top of the high-viscosity and high-efficiency maturation device (21), and the maturation device venting mechanism comprises a venting pipeline connected to the high-viscosity and high-efficiency maturation device (21) and a No. I maturation device safety valve (212), a No. I maturation device venting solenoid valve (213) and a No. I maturation device pressure transmitter (214) arranged on the venting pipeline in order from top to bottom; a No. I liquid level transmitter (215) is arranged at the liquid inlet at the bottom of the high-viscosity and high-efficiency maturation device (21); an air inlet is arranged on the high-viscosity and high-efficiency maturation device (21), and the air inlet is connected to the nitrogen main pipeline (6) through the high-viscosity and high-efficiency maturation device nitrogen pipeline (26), and a No. I nitrogen solenoid valve (211) is arranged on the high-viscosity and high-efficiency maturation device nitrogen pipeline (26).

7. The fully enclosed rapid dissolution and maturation injection process equipment for offshore oilfield chemical flooding according to claim 1 is characterized by: A supergravity aging device venting mechanism is arranged at the top of the supergravity aging device (22), and the supergravity aging device venting mechanism comprises a venting pipeline connected to the supergravity aging device (22) and a No. II aging device safety valve (222), a No. II aging device venting solenoid valve (223) and a No. II aging device pressure transmitter (224) arranged on the venting pipeline in order from top to bottom; a No. II liquid level transmitter (225) is arranged at the bottom of the supergravity aging device (22). ); the supergravity aging device (22) is provided with an air inlet, and the air inlet is connected to the nitrogen main pipeline (6) through the supergravity aging device nitrogen pipeline (27), and a No. II nitrogen solenoid valve (221) is provided on the supergravity aging device nitrogen pipeline (27); a mother liquid sampler (251), a mother liquid viscosity online detector (252) and a mother liquid pressure transmitter (253) are sequentially provided on the mother liquid pipeline at the liquid outlet of the supergravity aging device (22) according to the liquid flow direction.

8. The fully enclosed rapid dissolution and maturation injection process equipment for offshore oilfield chemical flooding according to claim 1 is characterized by: The liquid inlet of the high-pressure injection polymer pump (31) is communicated with the inter-skid pipeline between the quick dissolving and maturing system (2) and the high-pressure injection system (3); the liquid outlet of the high-pressure injection polymer pump (31) is communicated with the liquid inlet of the high-pressure tubular cyclone maturator (32) through the high-pressure mother liquor pipeline; the liquid outlet of the high-pressure tubular cyclone maturator (32) is communicated with the liquid inlets of the No. I high-pressure internal coupling disperser (33) and the No. II high-pressure internal coupling disperser (34) through the No. I high-pressure mother liquor pipeline branch (37) and the No. II high-pressure mother liquor pipeline branch (38), respectively; the No. I high-pressure mother liquor flowmeter (371) and the No. I high-pressure mother liquor regulating valve (372) are arranged on the No. I high-pressure mother liquor pipeline branch (37); the No. II high-pressure mother liquor pipeline branch (38) is connected with the liquid inlets of the No. I high-pressure internal coupling disperser (33) and the No. II high-pressure internal coupling disperser (34) through the No. I high-pressure mother liquor pipeline branch (37). A No. II well high-pressure mother liquid flowmeter (381) and a No. II well high-pressure mother liquid regulating valve (382) are arranged on the mother liquid pressure pipeline branch (38); the liquid inlet of the No. I high-pressure internal coupling disperser (33) is connected to the oil displacement auxiliary agent bus (8) through the No. I oil displacement auxiliary agent pipeline (35); the water inlet of the No. I high-pressure internal coupling disperser (33) is connected to the high-pressure liquid distribution water supply bus (7) through the No. I high-pressure water supply pipeline (39); the liquid outlet of the No. I high-pressure internal coupling disperser (33) is connected to the No. I well (9) through the No. I well target liquid injection pipeline (311); the No. I well oil displacement auxiliary agent ball valve (351) is arranged on the No. I oil displacement auxiliary agent pipeline (35); the No. I high-pressure water supply pipeline (39) is connected to the No. I high-pressure liquid distribution water supply bus (7); the liquid outlet of the No. I high-pressure internal coupling disperser (33) is connected to the No. I well (9) through the No. I well target liquid injection pipeline (311); the No. I well oil displacement auxiliary agent ball valve (351) is arranged on the No. I oil displacement auxiliary agent pipeline (35); the No. I high-pressure water supply pipeline (39) is connected to the No. I well target liquid injection pipeline (311); the No. I well target liquid distribution water supply bus (39 ... A No. Ⅰ well high pressure water supply flow meter (391) and a No. Ⅰ well high pressure water supply regulating valve (392) are arranged on the No. Ⅰ well target liquid injection pipeline (311) in sequence according to the liquid flow direction; a No. Ⅰ well target liquid pressure transmitter (3111), a No. Ⅰ well target liquid viscosity online detector (3112), a No. Ⅰ well target liquid sampler (3113) and a No. Ⅰ well target liquid ball valve (3114) are arranged on the No. Ⅰ well target liquid injection pipeline (311) in sequence according to the liquid flow direction; the liquid inlet of the No. Ⅱ high pressure internal coupling disperser (34) is connected to the oil displacement auxiliary agent bus (8) through the No. Ⅱ oil displacement auxiliary agent pipeline (36); the water inlet of the No. Ⅱ high pressure internal coupling disperser (34) is connected to the high pressure oil displacement auxiliary agent bus (8) through the No. Ⅱ high pressure water supply pipeline (310). The liquid distribution water supply bus (7) is connected; the liquid outlet of the No. II high-pressure internal coupling disperser (34) is connected to the No. II well (10) through the No. II well target liquid injection pipeline (312); the No. II well oil displacement auxiliary agent pipeline (36) is provided with a No. II well oil displacement auxiliary agent ball valve (361); the No. II well high-pressure water supply pipeline (310) is provided with a No. II well high-pressure water supply flowmeter (3101) and a No. II well high-pressure water supply regulating valve (3102); the No. II well target liquid injection pipeline (312) is provided with a No. II well target liquid pressure transmitter (3121), a No. II well target liquid viscosity online detector (3122), a No. II well target liquid sampler (3123) and a No. II well target liquid ball valve (3124).

9. The fully enclosed rapid dissolution and maturation injection process equipment for offshore oilfield chemical flooding according to claim 7, characterized in that: A high-pressure water supply shutoff ball valve (71) and a high-pressure water supply pressure transmitter (72) are arranged on the high-pressure liquid distribution water supply bus (7) in sequence from the direction of liquid flow.

10. A method for using the fully enclosed rapid dissolution and maturation injection process equipment for offshore oilfield chemical flooding according to any one of claims 1 to 9, characterized in that: The following steps are involved: (I) Ton-bag polymer dry powder is added to the storage tank through an electric feeder, and enters the feed port of the stator-rotor disperser after the feeding amount is accurately controlled by the screw feeder; the low-pressure liquid water supply sent from the platform is filtered by the water supply double filter and divided into primary water supply and secondary water supply; the primary water supply is measured by the flow meter and regulated by the regulating valve, and then enters the water inlet of the stator-rotor disperser; the polymer dry powder and the primary water supply pass through the stator-rotor disperser, ultrasonic disperser and low-shear delivery pump in turn to form a polymer stock solution with uniformly dispersed particles, and enters the liquid inlet of the internal coupling dynamic disperser; the secondary water supply is measured by the flow meter and regulated by the regulating valve, and then enters the water inlet of the internal coupling dynamic disperser; the polymer stock solution and the secondary water supply pass through the internal coupling dynamic disperser to form a uniformly dispersed and preliminarily dissolved polymer mother solution; (II) the polymer mother liquor is sequentially passed through a high-viscosity and high-efficiency ripener, a supergravity ripener, a low-shear feed pump, a tubular cyclone ripener and a mother liquor double filter to form a basically ripened polymer mother liquor; (III) After the polymer mother liquor is pressurized by a high-pressure polymer injection pump and deeply matured in a high-pressure tubular cyclone maturer, a fully matured polymer mother liquor is formed, which is divided into the high-pressure mother liquor of well No. Ⅰ and the high-pressure mother liquor of well No. Ⅱ, which are respectively measured by a flow meter and regulated by a regulating valve and then enter the corresponding liquid inlet of the high-pressure internal coupling disperser; the high-pressure liquid water supply sent by the platform is divided into the high-pressure water supply of well No. Ⅰ and the high-pressure water supply of well No. Ⅱ, which are respectively measured by a flow meter and regulated by a regulating valve and then enter the corresponding water inlet of the high-pressure internal coupling disperser; Inside the high-pressure internal coupling disperser, the high-pressure mother liquid and the high-pressure water supply are diluted, mixed and dispersed in a certain proportion to form a polymer target liquid that meets the injection index requirements, and then injected into the formation oil reservoir of Well Ⅰ or Well Ⅱ; According to the needs of chemical flooding operations, the oil recovery agent is injected into the formation oil reservoir along with the polymer mother liquid through the oil recovery agent pipeline.

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