CN201396128Y

CN201396128Y - CO2 liquid injection device

Info

Publication number: CN201396128Y
Application number: CN2009201583581U
Authority: CN
Inventors: 王欣宇
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-05-22
Filing date: 2009-05-22
Publication date: 2010-02-03
Anticipated expiration: 2019-05-22

Abstract

The utility model relates to a CO2 liquid injection device in the field for driving away the oil by CO2 in the oilfield, mainly solving the problem that the oil is driven away by injecting CO2 at small scale in scattered area by the limitation of geographic position, working environment, production cost and the like. The device is characterized in that a shielding pump (15) and a shock-absorbing tube (18) are arranged on the liquid feeding tube (13) in sequence, a buffer (9) at the high-pressure outlet of a plunger pump (19) is communicated with a liquid injection tube (10), an automatic temperature adjusting device (9) is mounted on the liquid injection tube (10) and communicated with a liquid injection gathering pipe (22). The device has compact and simple structure, stable and reliableperformance, lower working environment requirement, and convenient maintenance, moreover, the device can be in a lifting type, therefore the device is convenient to move and remove, is repeated to use, and is suitable for injecting CO2 liquid into the oil well at small scale in scattered area, the investment is lower and the economic benefit is remarkable.

Description

A kind of CO 2Priming device

Technical field

The utility model relates to oil field CO ₂A kind of CO in displacement of reservoir oil field ₂Priming device specifically is applicable to small-scale, scattered block CO ₂A kind of CO of the displacement of reservoir oil ₂Priming device.

Background technology

The exploitation of oil mainly is a waterflooding extraction at present, and permeability block with higher displacement of reservoir oil by filling water can be received effect preferably.But for the reservoir that the extra-low permeability difficulty is adopted, the oil displacement efficiency that the conventional waterflooding exploitation is difficult to receive.Because CO ₂Be a kind of oil displacement agent very efficiently, easily be dissolved in crude oil and its volume expansion, viscosity are reduced, compare CO with gases such as nitrogen, air ₂With the easier formation mixed phase of in-place oil, reduce interfacial tension, reduce filtrational resistance, thereby improve oil recovery factor, so CO ₂Drive in exploitation extra-low permeability difficulty and adopt the extensive attention that has caused people aspect the reserves, have, can utilize petroleum resources to a greater extent than the more obvious technical advantage of water drive.For relatively large and with the CO of abundance ₂The zones and surface areas for joint exploration and exploitation that the source of the gas distance is suitable can adopt line transportation CO ₂Gas injects the block stratum to mining area through multi-stage compression; And for small-scale, scattered block, as take aforesaid way will be subjected to all multifactor restrictions such as geographical position, working environment, cost of production.

Summary of the invention

Adopt the oil storage block for satisfied small-scale, scattered extra-low permeability difficulty and annotate CO ₂The displacement of reservoir oil improves the recovery ratio requirement, and the utility model provides a kind of CO ₂Priming device, this apparatus structure is simple, stable and reliable for performance, the working environment requirement is low, easy to maintenance, and this device can adopt skid-mounted type, convenient mobile resettlement, repeated use.

The technical solution of the utility model is: a kind of CO ₂Priming device comprises that fluid reservoir connects plunger displacement pump by feed pipe, and plunger displacement pump connects the fluid injection header by liquid injection pipe, it is characterized in that: canned motor pump and damping tube are installed on described feed pipe successively; Install at the high-pressure outlet place of plunger displacement pump snubber and with liquid injection pipe UNICOM, and automatic temperature-regulator and fluid injection header UNICOM are housed on the liquid injection pipe.

Be connected with damping tube after described high pressure reflow pipe, low pressure return duct cross, and damping tube connects cooling for reflux pipe and recovery tube on the canned motor pump.

The beneficial effects of the utility model are: owing to adopt technique scheme, on the feed flow pipeline canned motor pump is installed, airtight for plunger displacement pump, the stable CO that provides ₂Liquid reduces that environment is polluted, and keeps suitable liquid supply pressure; Because damping tube has been installed, reduce the vibration influence that liquid-supplying system is caused simultaneously, improved system's traveling comfort; In the fluid injection exit of plunger displacement pump snubber being installed realizes to the peak clipping of plunger pump discharge pressure, damping, voltage stabilizing, energy storage, to avoid the injected system pressure oscillations; The automatic temperature-regulator of installing on liquid injection pipe can make the temperature of the carbon dioxide liquid of transporting to the fluid injection header adjust to optimum temperature, to avoid the temperature discomfort to CO ₂Liquid injection system causes damage; Because this apparatus structure is simply compact, stable and reliable operation safety cools back flow liquid, gas centralized collection, energy-conserving and environment-protective; And this device can adopt skid-mounted type, conveniently moves resettlement, reuses, and small investment and remarkable in economical benefits help improving the recovery ratio of oil reservoir crude oil, is particularly suitable for various scattered, block CO on a small scale ₂The displacement of reservoir oil is used.

Description of drawings

Accompanying drawing 1 is a structural representation of the present utility model.

1-fluid reservoir fluid infusion 2-backflow focuses on outlet valve 3-recovery tube 4-damping tube 5-fluid reservoir 6-high pressure reflow pipe 7-safety valve 8-energy storage buffer device 9-automatic temperature-regulator 10-liquid injection pipe 11-atmospheric valve 12-low pressure flow meter 13-feed pipe 14-bypass pipe 15-canned motor pump 16-cooling for reflux pipe 17-low pressure return duct 18-damping tube 19-plunger displacement pump 20-flap valve 21-high-pressure flowmeter 22-fluid injection header 23-and removes each fluid injection well control valve among the figure

The specific embodiment

The utility model is described in further detail below in conjunction with accompanying drawing;

Shown in accompanying drawing 1, this CO ₂Priming device mainly comprises CO ₂Fluid reservoir 5, feed pipe 13, plunger displacement pump 19, liquid injection pipe 10 and fluid injection header 22 are wherein installed liquid supplementation pipe 1 and feed pipe 13 on the fluid reservoir 5, liquid supplementation pipe 1 is in order to replenish CO ₂Liquid, feed pipe 13 is output CO outwards ₂Liquid, the other end of feed pipe 13 connects plunger displacement pump 19; Low pressure flow meter 12, canned motor pump 15, valve and pressure meter are installed on the described feed pipe 13, and damping tube 18 is installed on the feed pipe 13 between canned motor pump 15 and the plunger displacement pump 19, canned motor pump 15 is used for being the plunger displacement pump 19 airtight stable CO that provide ₂Liquid, and keep suitable liquid supply pressure, damping tube 18 is used for reducing the vibrations of liquid-supplying system, improves system's traveling comfort; Three pipeline outlets are arranged on the plunger displacement pump 19, and the liquid injection pipe 10 of fluid injection header 22 is led in a connection, in this exit of plunger displacement pump 19 snubber 8 is installed, and is used for mild outlet pressure, reduces vibrations and energy storage capacity; Snubber 8 connects liquid injection pipe 10, and flap valve 20, high-pressure flowmeter 21, automatic temperature-regulator 9 also are installed on liquid injection pipe 10 successively, and automatic temperature-regulator 9 makes the CO that transports to fluid injection header 22 ₂The temperature of liquid is adjusted to optimum value automatically, with the infringement of avoiding the temperature discomfort that liquid injection system is caused; Liquid injection pipe 10 is installed atmospheric valve 11 with the junction of fluid injection header 22; Other two pipelines outlets are respectively high pressure reflow pipe 6 and low pressure return duct 17 on the plunger displacement pump 19, collect in the plunger displacement pump 19 height respectively to exteenal reflux, low pressure liquid, safety valve 7 is housed on high pressure reflow pipe 6, high, low pressure return duct (6,17) cross the back be connected with damping tube (4), damping tube 4 pushes back the vibrations that the flow liquid body causes in order to alleviate band, damping tube (4) connects to reflux concentrates recovery tube 3, cooling for reflux pipe (16) also is connected with the concentrated recovery tube 3 that refluxes, cooling for reflux pipe 16 other ends connect canned motor pump 15, the other end of recovery tube 3 is equipped with to reflux and focuses on outlet valve 2, with phegma, the gas centralized collection is handled or is utilized, avoids contaminated environment; On feed pipe 13, connect bypass pipe 14, be used for interim feed flow; Each fluid injection well control valve 23 is installed on fluid injection header 22; On each pipeline, also be separately installed with valve and pressure meter in addition,, guarantee stable, the safety of injection device so that observe, control.This device is because simple and compact for structure, stable and safe in operation is reliable, cool back flow liquid, gas centralized collection, energy-conserving and environment-protective, and can adopt skid-mounted type, convenient resettlement, repeated use, small investment and the remarkable in economical benefits of moving, the recovery ratio of favourable raising oil reservoir crude oil is particularly suitable for various scattered, the CO of block on a small scale ₂The displacement of reservoir oil is used.

Claims

1, a kind of CO ₂Priming device, comprise that fluid reservoir (5) connects plunger displacement pump (19) by feed pipe (13), plunger displacement pump (19) connects fluid injection header (22) by liquid injection pipe (10), it is characterized in that: canned motor pump (15) and damping tube (18) are installed on described feed pipe (13) successively; Install at the high-pressure outlet place of plunger displacement pump (19) snubber (8) and with liquid injection pipe (10) UNICOM, and be equipped with on the liquid injection pipe (10) automatic temperature-regulator (9) and with fluid injection header (22) UNICOM.

2, CO according to claim 1 ₂Priming device is characterized in that: be connected with damping tube (4) after the high pressure reflow pipe (6) that is connected with plunger displacement pump (19), low pressure return duct (17) cross, and damping tube (4) connects the cooling for reflux pipe (16) on the canned motor pump (15) and concentrates recovery tube (3).