CN102777138A - Method combining coiled tubing with supercritical CO2 for jet-flow sand washing plugging removal - Google Patents

Method combining coiled tubing with supercritical CO2 for jet-flow sand washing plugging removal Download PDF

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CN102777138A
CN102777138A CN2011103593132A CN201110359313A CN102777138A CN 102777138 A CN102777138 A CN 102777138A CN 2011103593132 A CN2011103593132 A CN 2011103593132A CN 201110359313 A CN201110359313 A CN 201110359313A CN 102777138 A CN102777138 A CN 102777138A
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supercritical
sand washing
plugging
coiled tubing
tubing
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CN102777138B (en
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李根生
王海柱
田守嶒
黄中伟
史怀忠
宋先知
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China University of Petroleum Beijing
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China University of Petroleum Beijing
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Abstract

The invention relates to a method combining coiled tubing with supercritical CO2 for jet-flow sand washing plugging removal. The method uses the supercritical CO2 as flushing fluid to carry out jet-flow sand washing plugging removal for a shaft or an oil casing. When a supercritical CO2 jet-flow is combined with the coiled tubing to carry out supercritical CO2 jet-flow sand washing plugging removal, pressure relief is not needed in the trip process, the coiled tubing can directly work with pressure, and the working procedure and the time are saved. The fluid viscosity of the supercritical CO2 is low, the surface tension of the supercritical CO2 is close to zero, and the diffusion coefficient of the supercritical CO2 is large, so that the supercritical CO2 can easily enter into tiny pores and cracks to dissolve polymer organic matters and other impurities, and the cleaning is more thorough. And, above all, the supercritical CO2 does not have any pollution to a reservoir, the viscosity of crude oil can also be reduced after the supercritical CO2 enters into the reservoir, the permeability of the reservoir is increased, and the yield and the recovery ratio are increased. Thus, the supercritical CO2 is especially suitable for downhole plugging removal working of unconventional oil-gas reservoirs such as low permeability oil-gas reservoirs, pressure-depleted oil-gas reservoirs, coal gas reservoirs, shale gas reservoirs, tight sandstone gas reservoirs, heavy oil reservoirs and the like.

Description

The coiled tubing supercritical CO 2The method of jet flow sand washing de-plugging
Technical field
The present invention relates to a kind of method of oil well sand washing de-plugging, relate in particular to a kind of coiled tubing supercritical CO 2The sand washing method for removing blockage belongs to oil de-plugging field.
Background technology
Problems such as sand production of oil-gas wells, fracturing sand are residual, wellbore damage obstruction are global operator's questions of common concern always, have just found this problem as far back as 20 beginning of the century people, and have made great efforts to explore always, seek optimum solution.
At present; No matter be domestic or all adopt water (adding some additives in case of necessity) to carry out clean-out service abroad; When running into pressure depletion reservoir, often adopt nitrogen foam or air to carry out the underbalance well-flushing, alleviated the production decline problem that causes because of the pit shaft obstruction to a certain extent.Yet this type well-flushing mode does not but fundamentally solve the pit shaft blockage problem; For example, water causes than major injury water sensitivity oil-gas reservoir meeting after getting into reservoir; Although adopt the foam well-flushing can reduce bottom pressure; But foam quality is difficult to control, is easy to cause bottom hole pressure surge, and is bigger to reservoir damage; In addition, pit shaft stop up most important a kind of be exactly the obstruction that macromolecule organics such as pitch are mingled with the grains of sand, clay etc., some is deposited in the shaft bottom; Some is attached to the borehole wall; Seriously blocked oil flow channel, this type is blocked in when utilizing the water jet de-plugging, because macromolecule organics such as pitch have very strong viscoplasticity; Water jet is difficult to broken this type material, also just is difficult to this type material is thoroughly removed.
In the long-time manufacturing process of oil gas well, because formation water salinity is higher, be easy to fouling on tubing and casing, fouling thickness crosses that senior general causes can't ordinary production.The tradition scale removal has mechanical descaling, the chemical agent scale removal is arranged, water jet scale removal etc.; The traditional mechanical scale removal is easy to tubing and casing is caused damage, and the chemical agent scale removal also can cause corrosion to tubing and casing, though the water jet scale removal is little to the tubing and casing damage; But running into hard incrustation scale water jet but can't thoroughly remove; The pump pressure of its requirement is also higher simultaneously, if adopt the abradant jet scale removal, bad then can the penetrating of pressure control worn tubing and casing.
Summary of the invention
For solving the problems of the technologies described above, the object of the present invention is to provide a kind of pit shaft or tubing and casing to carry out the jet flow sand washing method for removing blockage, it is to adopt coiled tubing delivering liquid CO 2, make it become supercritical CO in wellbore bottom or tubing and casing bottom 2And to the method that pit shaft or tubing and casing are carried out the jet flow sand washing de-plugging, characteristics such as it is high to have an efficiency of breaking rock of injection, and broken rock thresholding pressure is low, and flow chart is few, and operating cost is low.
For achieving the above object, the invention provides a kind of coiled tubing supercritical CO 2The method of jet flow sand washing de-plugging, it is with supercritical CO 2Pit shaft or tubing and casing are carried out the method for jet flow sand washing de-plugging for flushing fluid.
CO 2Gas is a kind of common gas, with its warming and pressurizing to (critical-temperature T more than the critical point c＞31.1 ℃, critical pressure P c＞become supercritical CO 7.38MPa) time 2Fluid (SC-CO 2-super critical CO 2).Under formation temperature and pressure condition, just can make CO more than the general well depth 750m 2Reach supercriticality.Supercritical CO 2Fluid both had been different from gas, also was different from liquid, and it has low-viscosity and the high diffusibility that approaches gas, the high density that approaches liquid and surface tension is characteristic such as zero.These characteristics make supercritical CO 2Spray broken rock and have higher efficient and lower broken rock thresholding pressure, its low glutinous characteristic helps CO in washing well process 2Fluid flows, and it is bigger that reservoir is handled the degree of depth; In addition, supercritical CO 2Have stronger solvability again, can dissolution precipitation in the shaft bottom or attached to the organic obstruction of macromolecules such as pitch on the borehole wall, better to the pit shaft cleaning effect.Coiled tubing can Operating Pressure, removes conveniently, therefore with supercritical CO 2Fluid and coiled tubing combine and carry out pit shaft sand washing de-plugging, have not only simplified operation procedure and have reduced operating cost, and can also improve well washing effect.
Above-mentioned coiled tubing supercritical CO provided by the present invention 2The method of jet flow sand washing de-plugging can may further comprise the steps:
Drifting is handled: use the jack rabbit drifting;
The sand washing de-plugging is handled: with liquid CO 2Be transported in pit shaft or the tubing and casing this liquid state CO through coiled tubing 2In pit shaft or tubing and casing, become supercritical CO 2Fluid also carries out the sand washing de-plugging through the jet washing well device.
According to concrete technical scheme of the present invention, this method is further comprising the steps of: in sand washing de-plugging processed steps, coiled tubing is transferred on sand washing limit, limit;
When jet flow sand washing de-plugging operation behind wellbore bottom or tubing and casing bottom, carry coiled tubing on gradually and carry out the sand washing de-plugging and handle.
According to concrete technical scheme of the present invention, this method is further comprising the steps of: when jet flow sand washing de-plugging operation behind pit shaft top or tubing and casing top, transfer coiled tubing gradually and carry out the sand washing de-plugging and handle, said transfer and on propose coiled tubing circulation 1-5 time.
According to concrete technical scheme of the present invention, said sand washing de-plugging is handled and is comprised following concrete steps:
To be stored in CO through high pressure line 2Liquid CO in the tank car 2Be transported to the high-pressure pump group and become high-pressure liquid CO 2, said high-pressure liquid CO 2Send into coiled tubing via high pressure line, arriving in pit shaft or the tubing and casing becomes supercritical CO 2Fluid also carries out the sand washing de-plugging through the jet washing well device.
According to concrete technical scheme of the present invention, when pit shaft was carried out the jet flow sand washing de-plugging, lowering velocity and upward strain speed were 3～5 meters/minute; When tubing and casing was carried out the jet flow sand washing de-plugging, lowering velocity and upward strain speed were 2～4 meters/minute.
In above-mentioned sand washing method for removing blockage provided by the invention, the CO that is adopted 2It is more extensive to originate, can be by CO 2The gas field directly obtains, and perhaps from the tail gas of generations such as power plant, steel mill, extracts (so more helping environmental protection), because supercritical CO 2CO during the jet flow sand washing de-plugging 2Consumption is little, can be by CO 2Tank car transports, CO 2Storage tank preferably can pressure-bearing 8MPa about, guarantee CO 2Under certain temperature and pressure, be in liquid state, also need have insulation effect simultaneously, keep the low temperature that needs in the storage tank.CO 2Can install refrigeration unit as required additional on the tank car, guarantee in the transportation and pump into high-pressure pump before needs.CO 2Transport pressure generally can be controlled at 3-5MPa, temperature is controlled at-20 ℃ to 5 ℃, can guarantee like this to transport safely.In order to guarantee liquid CO better 2State, preferably, be stored in CO 2Liquid CO in the tank car 2Pressure may be controlled to 4-5MPa, temperature may be controlled to-10 ℃ to 5 ℃.
The heavy chemicals seals such as rubber of device therefor and instrument change metal seal into during operation, and main cause is CO 2Penetrability is very strong, can be penetrated in the rubber-like macromolecular material, and overlong time just can be stung leakage rubber cushion, at well head preventer is installed simultaneously, carries out safety precaution work; Secondly, on the high-pressure pump pump head, install cooling back installation additional, temperature generally is controlled at-5-3 ℃ about, prevent piston and sleeve frictional heat, make liquid CO 2Vaporization influences pump efficiency.
When carrying out sand washing de-plugging operation, at the well head place, the liquid CO in the coiled tubing 2Be in the cryogenic high pressure liquid state, along with liquid CO 2Descending gradually, its temperature and pressure also raises gradually, when temperature and pressure simultaneously during postcritical, and liquid CO 2Change supercritical CO into 2, supercritical CO 2Fluid produces the high pressure supercritical CO through the jet washing well device 2Jet washes away and cleans well bore wall or oil jacket tube wall.Because the temperature on stratum rises along with the increase of the degree of depth gradually, temperature gradient is about 20-50 ℃/km, will be above CO in the local temperature that underground hundreds of rice is dark 2Critical-temperature (31.1 ℃), simultaneously the required pressure of pressure break is generally higher, is easy to reach CO 2Critical pressure (7.38MPa), therefore, 750m just can realize supercritical CO in the down-hole usually 2The sand washing de-plugging.And when stratum temperature anomaly, or on the superficial part stratum when sand washing de-plugging can't reach critical-temperature, can be on ground liquid towards CO 2Fluid heats, and sand washing method for removing blockage promptly provided by the present invention can also comprise high-pressure liquid CO 2Be transported to the step that the ground heater heats through high pressure line; This heat treated can be carried out on ground.
According to concrete technical scheme of the present invention; The well mouth of oil well place is provided with the annulus back pressure valve, rationally controls the opening degree of annulus back pressure valve, makes bottom pressure be in equilibrium state as far as possible; Guarantee that the shaft bottom foreign material can not get into earth formation deep with flow, make supercritical CO on the other hand on the one hand 2Density improves as far as possible, to improve its solvability, strengthens well washing effect, can guarantee that also the shaft bottom foreign material return out well head smoothly simultaneously.
According to concrete technical scheme of the present invention, this method is further comprising the steps of: CO 2Recycle is handled: the CO that returns out well head 2Mixture passes through desander, annulus back pressure valve, liquid knockout, CO successively 2Gas purifier, CO 2Reflux pipeline is transported to said CO 2Tank car.
According to concrete technical scheme of the present invention, said jet washing well device is a rotary nozzle, and said rotary nozzle is made up of damper, head body, nozzle and rotating shaft.
The present invention adopts supercritical CO 2Fluid has following advantages as the method that flushing fluid carries out the jet flow sand washing de-plugging to pit shaft or tubing and casing:
1, supercritical CO 2The injection efficiency of breaking rock is high, and broken rock thresholding pressure is low.Continuous exploitation along with oil gas; Macromolecule organic in the reservoir (like pitch) and foreign material such as fine sand and clay particle converge to around the pit shaft gradually, and what have resides in nearly well reservoir, have attached to the borehole wall; What have then deposits to wellbore bottom, has seriously stopped up oil flow channel.Because this type material has viscoplasticity, water jet is difficult to carry out pit shaft with its fragmentation and with it.Supercritical CO 2The broken rock thresholding pressure of jet is lower, and it has stronger solvability again simultaneously, can and dissolve these macromolecule organics with lower expulsion pressure fragmentation, and carry out pit shaft easily;
2, supercritical CO 2Fluid viscosity is low, surface tension approaches zero, diffusion coefficient is big, and these characteristics make it in washing well process, are easy to enter into micro-pore and crack, and dissolving macromolecule organic and other impurity clean more thorough;
3, supercritical CO 2Fluid density adjustable extent broad under temperature in wellbore and pressure condition, is regulated wellhead back pressure and just can be controlled bottom pressure, realizes underbalance, balance or overbalance clean-out service.Water tends to pollute reservoir after getting into reservoir, and supercritical CO 2Not only can not pollute or injure reservoir after getting into reservoir, it can make clay-bonded sand pull-up water on the contrary, increases reservoir permeability; Mix the reduction viscosity of crude with crude oil; Strengthen its flowability, can also replace the methane that is adsorbed on shale or the coal seam simultaneously, improve oil gas well yield and recovery ratio;
4, supercritical CO 2Jet combines to carry out supercritical CO with coiled tubing 2During the jet flow sand washing de-plugging, rise in the lower tubular column process and need not pressure release, coiled tubing is Operating Pressure directly, saves operation and time, can also make CO simultaneously 2Recycle continuously, eliminated environment pollution, reduce operating cost.
Description of drawings
Following accompanying drawing only is intended to the present invention is done schematic illustration and explanation, not delimit the scope of the invention.
Wherein:
Fig. 1 is the coiled tubing supercritical CO 2Water jets horizontal well sand washing de-plugging sketch map
Fig. 2 is the coiled tubing supercritical CO 2Jet peupendicular hole sand washing de-plugging sketch map;
Fig. 3 is band CO 2The coiled tubing supercritical CO of sealing and circulating device 2Water jets horizontal well sand washing de-plugging sketch map;
Fig. 4 is a supercritical CO 2Tubing and casing scale removal sketch map;
Fig. 5 is the rotary nozzle sketch map.
The drawing reference numeral explanation:
1, CO 2Tank car; 2, vehicular refrigeration unit; 3, CO 2Storage tank; 4, adiabatic high pressure line 5 (5a and 5b), high-pressure pump group; 6, ground heater; 7,31,41, coiled tubing; 8, coiled tubing reel; 9, coiled tubing injection head; 10, wellhead assembly; 11, annulus back pressure valve; 12, the borehole wall; 13, pit shaft; 14, ground; 15, reservoir; 16, supercritical CO 2Jet; 17, jet eyelet; 18, shaft bottom; 19, supercritical CO 2The jet washing well device; 20, stratum; 21, desander; 22, liquid knockout; 23, CO 2Gas purifier; 24, CO 2Reflux pipeline; 32, dirt chip; 33,44, side forward direction nozzle; 34, tubing and casing; 35, shower nozzle; 36,43, side direction nozzle; 37, supercritical CO 2Jet; 38, oil jacket pipe scale; 42, damper; 45 forward direction nozzles; 46, head body; 47, rotating shaft.
The specific embodiment
To understand in order technical characterictic of the present invention, purpose and beneficial effect being had more clearly, with reference to Figure of description technical scheme of the present invention is carried out following detailed description, but but can not be interpreted as qualification at present practical range of the present invention.
Embodiment
Coiled tubing supercritical CO provided by the invention 2The jet flow sand washing method for removing blockage is introduced supercritical CO 2Fluid can be given full play to supercritical CO as well-flushing liquid 2With the advantage separately of coiled tubing, this method can comprise following concrete steps:
1, drifting is handled: use the jack rabbit drifting, guarantee that coiled tubing and down-hole flushing tool are transferred smoothly to treat on the sand washing de-plugging layer position;
2, the sand washing de-plugging is handled:
Shown in Figure 1 is the coiled tubing supercritical CO 2Water jets horizontal well sand washing de-plugging sketch map.Before carrying out well-flushing, the well-flushing instrument to be transferred to treated upper end, sand washing de-plugging layer position earlier, error is no more than 0.5 meter;
Liquid CO 2By the CO that adds vehicular refrigeration unit 2 2Tank car 1 transportation, transport pressure is controlled at 4-5MPa, and temperature is controlled at-10 ℃ to 5 ℃;
CO 2Liquid CO in the storage tank 3 2Be transported to high-pressure pump group 5 (5a and 5b) through adiabatic high pressure line 4, with liquid CO 2Supercharging causes required operational pressure, and high-pressure pump quantity is decided by the design discharge capacity;
Liquid CO 2Through becoming high-pressure liquid CO after 5 pressurizations of high-pressure pump group 2, being transported to coiled tubing 7 via high pressure line, coiled tubing 7 passes through coiled tubing reel 8, coiled tubing injection head 9, wellhead assembly 10 and pit shaft 13 successively with high-pressure liquid CO 2Be transported to down-hole jet washing well device 19; When needs to high-pressure liquid CO 2When heating, can be after high-pressure pump group 5, ground heater 6 is set before the coiled tubing 7;
The supercritical CO of high pressure 2Fluid produces the high speed supercritical CO through jet eyelet 17 2 Jet 16 acts directly on the borehole wall 12, will pass through long-time production and remove attached to obstructions such as the dirt on the borehole wall, heavy greasy dirts; Space between the coiled tubing 7 and the borehole wall 12 is an annular space, can control the annular space base pressure through annulus back pressure valve 11 is set; Annulus back pressure valve 11 should be adjusted to a suitable position, makes bottom pressure be in equilibrium state as far as possible, guarantees that the shaft bottom foreign material can not get into earth formation deep with flow, make supercritical CO on the other hand on the one hand 2Density raising as far as possible (generally is controlled at 700kg/m 3More than), improving its solvability, strengthen well washing effect, improve sand washing de-plugging efficient, also to guarantee that foreign material such as landwaste that perforation generates and abrasive material waste residue can be by supercritical CO simultaneously 2Fluid is carried pit shaft 13 outside through annular space, arrives ground 14; In sand washing de-plugging processed steps, coiled tubing is transferred on sand washing limit, limit;
When jet flow sand washing de-plugging operation after wellbore bottom, carry coiled tubing on gradually and carry out the sand washing de-plugging and handle; When jet flow sand washing de-plugging operation behind the pit shaft top, transfer coiled tubing gradually and carry out the sand washing de-plugging and handle, put under said and propose coiled tubing circulation 1-5 time;
When pit shaft was carried out the jet flow sand washing de-plugging, lowering velocity and upward strain speed were 3～5 meters/minute; So up and down reciprocatingly the payzone borehole wall is cleaned, how much what visual well head returned out residue in the cleaning process selects termination of pumping opportunity.After the end of job, can be with remaining CO 2Directly inject the stratum, increase reservoir energy, reduce viscosity of crude, improve output.
Equally, in straight well, also can carry out supercritical CO 2Jet flow sand washing de-plugging (see figure 2), its step and horizontal well are similar.
Supercritical CO 2Jet also can carry out sand washing de-plugging (scale removal) to tubing and casing, because supercritical CO 2The broken rock thresholding pressure of jet is low, and broken rock speed is fast, so it has not only reduced the required pump pressure of sand washing de-plugging (scale removal), and sand washing de-plugging (scale removal) speed is fast, efficient is high, but can not cause any harm to tubing and casing itself simultaneously.Therefore use supercritical CO 2Jet carries out tubing and casing sand washing de-plugging (scale removal) will obtain satisfied effect.Fig. 4 is a supercritical CO 2Tubing and casing sand washing de-plugging (scale removal) sketch map, scale removal is lowered to pit shaft with shower nozzle 35 by coiled tubing 31, the high pressure supercritical CO 2Fluid produces the high speed supercritical CO of different directions through side forward direction nozzle 33 and side direction nozzle 36 2 Jet 37 acts directly on attached to the oil jacket pipe scale 38 on the tubing and casing 34, and the oil jacket pipe scale is broken into the CO that the dirt chip is returned 2Carry out pit shaft.In sand washing de-plugging processed steps, coiled tubing is transferred on sand washing limit, limit;
When sand washing de-plugging operation behind tubing and casing bottom, carry coiled tubing on gradually and carry out the sand washing de-plugging and handle; When jet flow sand washing de-plugging operation behind the tubing and casing top, transfer coiled tubing gradually and carry out the sand washing de-plugging and handle, put under said and propose coiled tubing circulation 1-5 time;
When tubing and casing was carried out the jet flow sand washing de-plugging, lowering velocity and upward strain speed were 2～4 meters/minute; So up and down reciprocatingly payzone oil jacket tube wall is cleaned, how much what visual well head returned out residue in the cleaning process selects termination of pumping opportunity.After the end of job, can be with remaining CO 2Directly inject the stratum, increase reservoir energy, reduce viscosity of crude, improve output.
No matter be pit shaft sand washing de-plugging or tubing and casing sand washing de-plugging (scale removal), all can select rotation sprayer, as shown in Figure 5.Its advantage is: rotating jet can cover any corner of pit shaft, cleans more thorough.Rotary nozzle is made up of damper 42, head body 46, nozzle 43-45 and rotating shaft 47, and side direction nozzle opening direction is consistent with the head body tangential direction, under jet action, produces propulsive thrust like this, drives the shower nozzle rotation.The shower nozzle rotating speed can be regulated through the damping fluid viscosity of regulating in the damper.
3, CO 2Recycle is handled:
Fig. 3 is band CO 2The coiled tubing supercritical CO of sealing and circulating device 2Water jets horizontal well sand washing de-plugging sketch map.Return out the CO of well head 2Mixtures of impurities such as fluid and heavy hydrocarbon, sewage, the grains of sand are removed solid impurity earlier through desander 21, mainly in order to prevent solid impurity erosion back-pressure valve in the flow at high speed process such as the grains of sand, the annulus back pressure of flowing through again valve 11.Fluid-mixing behind the removal solid impurity gets into liquid knockout 22, carries out gas-liquid separation, and the mist after the separation gets into CO 2Gas purifier 23 is to CO 2Purify pure CO 2Gas is via CO 2Reflux pipeline is transported to CO 2The CO of tank car 2 2 Storage tank 3, the liquefaction of cooling back continues to supply with high-pressure pump group 5, reaches CO 2The purpose of recycle.
The coiled tubing supercritical CO 2The jet flow sand washing de-plugging has following advantages:
1, supercritical CO 2The fluid density adjustable extent is bigger, through the adjustable bottom pressure of wellhead back pressure, carries out the underbalance clean-out service;
2, supercritical CO 2Fluid density is high, solvability is strong, supercritical CO 2Jet is can not only be easily broken to be deposited on the shaft bottom or attached to the gluey coagulation of the borehole wall, and can also dissolve the macromolecule greasy dirt, cleans more thorough;
3, supercritical CO 2Fluid viscosity is low, diffusion coefficient is big, and washing well process is penetrated into the reservoir deep more easily, and the cleaning deep formation is bigger than the water jet depth of interaction;
4, supercritical CO 2Reservoir is not had any pollution, can also reduce viscosity of crude behind the entering reservoir, increase reservoir permeability, improve output and recovery ratio;
5, supercritical CO 2Jet combines to carry out supercritical CO with coiled tubing 2During the jet flow sand washing de-plugging, rise in the lower tubular column process and need not pressure release, coiled tubing is Operating Pressure directly, saves operation and time, can also make CO simultaneously 2Recycle continuously, eliminated environment pollution, reduce operating cost.
Above-described specific embodiment; The object of the invention, technical scheme and beneficial effect have been carried out further explain, and institute it should be understood that the above is merely specific embodiment of the present invention; And be not used in qualification protection scope of the present invention; All within spirit of the present invention and principle, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. coiled tubing supercritical CO 2The method of jet flow sand washing de-plugging, it is with supercritical CO 2Be flushing fluid, through coiled tubing with liquid CO 2Be transported in pit shaft or the tubing and casing method that pit shaft or tubing and casing are carried out the jet flow sand washing de-plugging.
2. method according to claim 1, wherein, this method may further comprise the steps:
Drifting is handled: use the jack rabbit drifting;
The sand washing de-plugging is handled: with liquid CO 2Be transported in pit shaft or the tubing and casing this liquid state CO through coiled tubing 2In pit shaft or tubing and casing, become supercritical CO 2Fluid also carries out the sand washing de-plugging through the jet washing well device.
3. method according to claim 2, wherein, this method is further comprising the steps of:
In sand washing de-plugging processed steps, coiled tubing is transferred on sand washing limit, limit;
When jet flow sand washing de-plugging operation behind wellbore bottom or tubing and casing bottom, carry coiled tubing on gradually and carry out the sand washing de-plugging and handle.
4. method according to claim 3; Wherein, This method is further comprising the steps of: when jet flow sand washing de-plugging operation behind pit shaft top or tubing and casing top, transfer coiled tubing gradually and carry out the sand washing de-plugging and handle, said transfer and on propose coiled tubing circulation 1-5 time.
5. method according to claim 2, wherein, said sand washing de-plugging is handled and is comprised following concrete steps:
To be stored in CO through high pressure line 2Liquid CO in the tank car 2Be transported to the high-pressure pump group and become high-pressure liquid CO 2, said high-pressure liquid CO 2Send into coiled tubing via high pressure line, arriving in pit shaft or the tubing and casing becomes supercritical CO 2Fluid also carries out the sand washing de-plugging through the jet washing well device.
6. according to claim 3 or 4 described methods, wherein, when pit shaft is carried out the jet flow sand washing de-plugging, transfer coiled tubing speed and on carry coiled tubing speed be 3～5 meters/minute; When tubing and casing is carried out the jet flow sand washing de-plugging, transfer coiled tubing speed and on carry coiled tubing speed be 2～4 meters/minute.
7. method according to claim 5 wherein, is stored in CO 2Liquid CO in the tank car 2Pressure be 3-5MPa, temperature is-20 ℃ to 5 ℃.
8. method according to claim 2, wherein, this method also is included in liquid towards CO in the sand washing de-plugging processing 2The step that heats.
9. method according to claim 5, wherein, this method is further comprising the steps of:
CO 2Recycle is handled: the CO that returns out well head 2Mixture passes through desander, annulus back pressure valve, liquid knockout, CO successively 2Gas purifier, CO 2Reflux pipeline is transported to said CO 2Tank car.
10. method according to claim 2, wherein, said jet washing well device is a rotary nozzle, said rotary nozzle is made up of damper, head body, nozzle and rotating shaft.
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