CN102777138B - Coiled tubing supercritical CO 2the method of jet flow sand washing de-plugging - Google Patents

Coiled tubing supercritical CO 2the method of jet flow sand washing de-plugging Download PDF

Info

Publication number
CN102777138B
CN102777138B CN201110359313.2A CN201110359313A CN102777138B CN 102777138 B CN102777138 B CN 102777138B CN 201110359313 A CN201110359313 A CN 201110359313A CN 102777138 B CN102777138 B CN 102777138B
Authority
CN
China
Prior art keywords
supercritical
coiled tubing
tubing
sand
plugging
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201110359313.2A
Other languages
Chinese (zh)
Other versions
CN102777138A (en
Inventor
李根生
王海柱
田守嶒
黄中伟
史怀忠
宋先知
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China University of Petroleum Beijing CUPB
Original Assignee
China University of Petroleum Beijing CUPB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China University of Petroleum Beijing CUPB filed Critical China University of Petroleum Beijing CUPB
Priority to CN201110359313.2A priority Critical patent/CN102777138B/en
Publication of CN102777138A publication Critical patent/CN102777138A/en
Application granted granted Critical
Publication of CN102777138B publication Critical patent/CN102777138B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The present invention relates to a kind of coiled tubing supercritical CO 2jet flow sand washing method for removing blockage.The method is with supercritical CO 2for flushing fluid to carry out the method for jet flow sand washing de-plugging to pit shaft or tubing and casing.Supercritical CO 2jet is combined with coiled tubing and carries out supercritical CO 2during jet flow sand washing de-plugging, rise without the need to pressure release in lower tubular column process, coiled tubing can direct Operating Pressure, saving operation and time; Supercritical CO 2fluid viscosity is low, surface tension close to zero, diffusion coefficient is large, be easy to enter into micro-pore and crack, dissolve macromolecule organic and other impurity, clean more thorough; The most important thing is supercritical CO 2to reservoir without any pollution, viscosity of crude can also be reduced after entering reservoir, increase reservoir permeability, improve output and recovery ratio, be therefore very suitable for the down-hole de-plugging operation that the unconventionaloil pool such as hypotonic special low permeability oil field, stress discern oil-gas reservoir, bed gas reservoir, shale gas reservoir, DAMAGE OF TIGHT SAND GAS RESERVOIRS, heavy crude reservoir are hidden.

Description

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, particularly relate to a kind of coiled tubing supercritical CO 2sand-removing unblocking method, belongs to oil de-plugging field.
Background technology
The problems such as sand production of oil-gas wells, fracturing sand are residual, wellbore damage blocking are global operator's questions of common concern always, have just found this problem, and have carried out effort exploration always, seek optimum solution as far back as 20 beginning of the century people.
At present, no matter be domestic or all adopt water (adding some additives if desired) to carry out clean-out service abroad, when running into stress discern reservoir, normal employing nitrogen foam or air foam carry out underbalance well-flushing, alleviate to a certain extent because pit shaft blocks the production decline problem caused.But this kind of well-flushing mode does not but fundamentally solve pit shaft blockage problem, such as, after water enters reservoir, comparatively major injury can be caused to water sensitivity oil-gas reservoir, although adopt enriched in foam to reduce bottom pressure, but foam quality is difficult to control, and is easy to cause bottom hole pressure surge, larger to reservoir damage; In addition, the most important a kind of blocking being exactly the macromolecule organics such as pitch and being mingled with the grains of sand, clay etc. of pit shaft blocking, some is deposited in shaft bottom, some is attached to the borehole wall, Severe blockage oil flow channel, is this kind ofly blocked in when utilizing water jet de-plugging, because the macromolecule organics such as pitch have very strong viscoplasticity, water jet is difficult to broken this kind of material, is also just difficult to this kind of material thoroughly to remove.
In the long-time manufacturing process of Oil/gas Well, because formation water salinity is higher, be easy to fouling in tubing and casing, fouling thickness is crossed senior general and is caused normally producing.Tradition scale removal has mechanical descaling, there is chemical agent scale removal, water jet scale removal etc., tradition mechanical descaling is easy to cause damage to tubing and casing, and chemical agent scale removal also can cause corrosion to tubing and casing, although water jet scale removal is little to tubing and casing damage, but run into hard incrustation scale water jet but cannot thoroughly remove, the pump pressure of its requirement is also higher simultaneously, and according to abradant jet scale removal, Stress control is bad, can penetrate and wear 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 jet flow sand washing method for removing blockage, it adopts coiled tubing delivering liquid CO 2, make it bottom wellbore bottom or tubing and casing, become supercritical CO 2and pit shaft or tubing and casing are carried out to the method for jet flow sand washing de-plugging, have injection efficiency of breaking rock high, broken rock threshold pressure is low, the features such as 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 2for flushing fluid to carry out the method for jet flow sand washing de-plugging to pit shaft or tubing and casing.
CO 2gas is a kind of common gas, by more than its temperature-pressure to critical point (critical-temperature T c> 31.1 DEG C, critical pressure P c> 7.38MPa) time become supercritical CO 2fluid (SC-CO 2-supercriticalCO 2).Under formation temperature and pressure condition, general more than well depth 750m just can make CO 2reach supercriticality.Supercritical CO 2fluid was both different from gas, was also different from liquid, and it has close to the low-viscosity of gas and high diffusibility, is the characteristic such as zero close to the high density of liquid and surface tension.These characteristics make supercritical CO 2spray broken rock and have higher efficiency and lower broken rock threshold pressure, its low glutinous characteristic, contributes to CO in washing well process 2fluid flows, larger to reservoir treating depth; In addition, supercritical CO 2there is again stronger solvability, can dissolution precipitation in shaft bottom or be attached to the macromolecule organic plugging things such as pitch on the borehole wall, better to wellbore clean effect.Coiled tubing can Operating Pressure, removes conveniently, therefore by supercritical CO 2fluid combines with coiled tubing and carries out pit shaft sand-removing unblocking, not only simplify operation procedure and reduces 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 comprise the following steps:
Drifting process: use jack rabbit drifting;
Sand-removing unblocking process: by liquid CO 2be transported in pit shaft or tubing and casing by coiled tubing, this liquid CO 2supercritical CO is become in pit shaft or tubing and casing 2fluid also carries out sand-removing unblocking by jet washing well device.
According to concrete technical scheme of the present invention, the method is further comprising the steps of: in the step of sand-removing unblocking process, and coiled tubing is transferred on sand washing limit, limit;
After bottom jet flow sand washing de-plugging operation to wellbore bottom or tubing and casing, carry coiled tubing gradually and carry out sand-removing unblocking process.
According to concrete technical scheme of the present invention, the method is further comprising the steps of: when after jet flow sand washing de-plugging operation to pit shaft top or tubing and casing top, transfer coiled tubing gradually and carry out sand-removing unblocking process, described in transfer and on propose coiled tubing circulation 1-5 time.
According to concrete technical scheme of the present invention, described sand-removing unblocking process comprises following concrete steps:
CO will be stored in by high pressure line 2liquid CO in tank car 2be transported to high-pressure pump group and become high-pressure liquid CO 2, described high-pressure liquid CO 2send into coiled tubing via high pressure line, arrive in pit shaft or tubing and casing and become supercritical CO 2fluid also carries out sand-removing unblocking by jet washing well device.
According to concrete technical scheme of the present invention, when carrying out jet flow sand washing de-plugging to pit shaft, lowering velocity and upward strain speed are 3 ~ 5 ms/min; When carrying out jet flow sand washing de-plugging to tubing and casing, lowering velocity and upward strain speed are 2 ~ 4 ms/min.
In above-mentioned sand-removing unblocking method provided by the invention, the CO adopted 2source is relatively more extensive, can by CO 2gas field directly obtains, or extracts (being so more conducive to environmental protection), due to supercritical CO from the tail gas that power plant, steel mill etc. produce 2cO during jet flow sand washing de-plugging 2consumption is little, can by CO 2tank car transports, CO 2storage tank preferably can about pressure-bearing 8MPa, guarantee CO 2be in liquid state under certain temperature and pressure, also need that there is insulation effect simultaneously, maintain the low temperature needed in storage tank.CO 2tank car can install refrigeration unit additional as required, ensure in transportation and needs before pumping into high-pressure pump.CO 2transport pressure generally can control at 3-5MPa, temperature controls at-20 DEG C to 5 DEG C, can ensure like this to transport safely.In order to ensure liquid CO better 2state, preferably, be stored in CO 2liquid CO in tank car 2pressure may be controlled to 4-5MPa, temperature may be controlled to-10 DEG C to 5 DEG C.
During operation, the heavy chemicals seal such as rubber of device therefor and instrument changes metal seal into, and main cause is, CO 2penetrability is very strong, and can penetrate in rubber-like macromolecular material, overlong time just can sting leakage rubber cushion, installs preventer simultaneously, carry out safety precaution work at well head; Secondly, high-pressure pump pump head installs cooling back installation additional, and temperature general control, at about-5-3 DEG C, prevents piston and sleeve frictional heat, makes liquid CO 2vaporization, affects pump efficiency.
When carrying out sand-removing unblocking operation, at well head place, the liquid CO in coiled tubing 2be in cryogenic high pressure liquid state, along with liquid CO 2descending gradually, its temperature and pressure also raises gradually, when temperature and pressure while during postcritical, and liquid CO 2change supercritical CO into 2, supercritical CO 2fluid produces High-pressure supercritical CO through jet washing well device 2jet, washes away well bore wall or oil jacket tube wall and cleans.Because the temperature on stratum rises gradually along with the increase of the degree of depth, temperature gradient is about 20-50 DEG C/km, and the local temperature dark at underground hundreds of rice will more than CO 2critical-temperature (31.1 DEG C), pressure needed for concurrent fracturing is general higher, is easy to reach CO 2critical pressure (7.38MPa), therefore, usually just can realize supercritical CO at down-hole 750m 2sand-removing unblocking.And when stratum temperature anomaly, or when shallow stratum sand-removing unblocking cannot reach critical-temperature, can at ground liquid towards CO 2fluid heats, and namely sand-removing unblocking method provided by the present invention can also comprise high-pressure liquid CO 2the step that ground heater carries out heating is transported to through high pressure line; This heating can be carried out on ground.
According to concrete technical scheme of the present invention, well mouth of oil well place arranges annulus back pressure valve, the opening degree of conservative control annulus back pressure valve, makes bottom pressure be in equilibrium state as far as possible, ensure that shaft bottom foreign material can not flow to into earth formation deep with liquid, 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, also can ensure that shaft bottom foreign material return out well head smoothly simultaneously.
According to concrete technical scheme of the present invention, the method is further comprising the steps of: CO 2recycle process: the CO returning out well head 2mixture is successively through desander, annulus back pressure valve, liquid knockout, CO 2gas purifier, CO 2reflux pipeline is transported to described CO 2tank car.
According to concrete technical scheme of the present invention, described jet washing well device is rotary nozzle, and described rotary nozzle is made up of damper, head body, nozzle and rotating shaft.
The present invention adopts supercritical CO 2fluid carries out the method for jet flow sand washing de-plugging to pit shaft or tubing and casing as flushing fluid, have following advantages:
1, supercritical CO 2injection efficiency of breaking rock is high, and broken rock threshold pressure is low.Along with the continuous exploitation of oil gas, macromolecule organic (as pitch) in reservoir and the foreign material such as fine sand and clay particle converge to around pit shaft gradually, and what have resides in nearly well reservoir, and what have is attached to the borehole wall, what have then deposit to wellbore bottom, Severe blockage oil flow channel.Because this kind of material has viscoplasticity, water jet is difficult to it is broken and is carried out pit shaft.Supercritical CO 2it is lower that jet breaks rock threshold pressure, and simultaneously it has again stronger solvability, can be broken and dissolve these macromolecule organics with lower expulsion pressure, and carry out pit shaft easily;
2, supercritical CO 2fluid viscosity is low, surface tension close to zero, diffusion coefficient is large, these features make it in washing well process, are easy to enter into micro-pore and crack, dissolve macromolecule organic and other impurity, clean more thorough;
3, supercritical CO 2fluid density adjustable extent is wider, under temperature in wellbore and pressure condition, regulates wellhead back pressure just can control bottom pressure, realizes underbalance, balance or overbalance clean-out service.Water often pollutes reservoir after entering reservoir, and supercritical CO 2not only can not pollute reservoir or injure after entering reservoir, it can make clay-bonded sand pull-up water on the contrary, increases reservoir permeability, mix with crude oil and reduce viscosity of crude, strengthen its mobility, simultaneously can also the methane of displacement sorption on shale or coal seam, improve oil gas well yield and recovery ratio;
4, supercritical CO 2jet is combined with coiled tubing and carries out supercritical CO 2during jet flow sand washing de-plugging, rise without the need to pressure release in lower tubular column process, coiled tubing can direct Operating Pressure, saves operation and time, while can also make CO 2continuous circulation uses, and eliminates environment pollution, reduces operating cost.
Accompanying drawing explanation
The following drawings is only intended to schematically illustrate the present invention and explain, not delimit the scope of the invention.
Wherein:
Fig. 1 is coiled tubing supercritical CO 2water jets horizontal well sand-removing unblocking schematic diagram
Fig. 2 is coiled tubing supercritical CO 2jet peupendicular hole sand-removing unblocking schematic diagram;
Fig. 3 is band CO 2the coiled tubing supercritical CO of sealing and circulating device 2water jets horizontal well sand-removing unblocking schematic diagram;
Fig. 4 is supercritical CO 2tubing and casing scale removal schematic diagram;
Fig. 5 is rotary nozzle schematic diagram.
Drawing reference numeral illustrates:
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 2jet 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.
Detailed description of the invention
In order to there be understanding clearly to technical characteristic of the present invention, object and beneficial effect, referring now to Figure of description, following detailed description is carried out to technical scheme of the present invention, but can not be interpreted as to of the present invention can the restriction of practical range.
Embodiment
Coiled tubing supercritical CO provided by the invention 2jet flow sand washing method for removing blockage introduces supercritical CO 2fluid, as well-flushing liquid, can give full play to supercritical CO 2with the respective advantage of coiled tubing, the method can comprise following concrete steps:
1, drifting process: use jack rabbit drifting, guarantees that coiled tubing and down-hole flushing tool are transferred smoothly and treats upper end, sand-removing unblocking layer position;
2, sand-removing unblocking process:
Figure 1 shows that coiled tubing supercritical CO 2water jets horizontal well sand-removing unblocking schematic diagram.Before carrying out well-flushing, first transferred to by well-flushing instrument and treat upper end, sand-removing unblocking layer position, error is no more than 0.5 meter;
Liquid CO 2by the CO adding vehicular refrigeration unit 2 2tank car 1 transports, and transport pressure controls at 4-5MPa, and temperature controls at-10 DEG C to 5 DEG C;
CO 2liquid CO in storage tank 3 2high-pressure pump group 5 (5a and 5b) is transported to, by liquid CO through adiabatic high pressure line 4 2supercharging causes required operational pressure, and high-pressure pump quantity is determined by design discharge capacity;
Liquid CO 2high-pressure liquid CO is become after high-pressure pump group 5 is pressurizeed 2, be transported to coiled tubing 7 via high pressure line, coiled tubing 7 successively through coiled tubing reel 8, coiled tubing injection head 9, wellhead assembly 10 and pit shaft 13 by high-pressure liquid CO 2be transported to down-hole jet stream well washing apparatus 19; When needs are to high-pressure liquid CO 2when heating, ground heater 6 can be set after high-pressure pump group 5, before coiled tubing 7;
The supercritical CO of high pressure 2fluid produces high speed supercritical CO through jet eyelet 17 2jet 16, acts directly on the borehole wall 12, removes through the long-time obstruction such as dirt, heavy oil greasy dirt be attached on the borehole wall of producing; Space between coiled tubing 7 and the borehole wall 12 is annular space, can control annular space base pressure by arranging annulus back pressure valve 11; Annulus back pressure valve 11 should adjust to a suitable position, makes bottom pressure be in equilibrium state as far as possible, ensures that shaft bottom foreign material can not flow to into earth formation deep with liquid on the one hand, makes supercritical CO on the other hand 2density is tried one's best, and (general control is at 700kg/m in raising 3above), to improve its solvability, strengthen well washing effect, improve sand-removing unblocking efficiency, also will ensure that the foreign material such as the landwaste that perforation generates and abrasive material waste residue can by supercritical CO simultaneously 2fluid carries pit shaft 13 outside through annular space, arrives ground 14; In the step of sand-removing unblocking process, coiled tubing is transferred on sand washing limit, limit;
When after jet flow sand washing de-plugging operation to wellbore bottom, carry coiled tubing gradually and carry out sand-removing unblocking process; When after jet flow sand washing de-plugging operation to pit shaft top, transfer coiled tubing gradually and carry out sand-removing unblocking process, put under described and propose coiled tubing circulation 1-5 time;
When carrying out jet flow sand washing de-plugging to pit shaft, lowering velocity and upward strain speed are 3 ~ 5 ms/min; So up and down reciprocatingly clean the payzone borehole wall, in cleaning process, visible wellhead returns out the number selection termination of pumping opportunity of residue.After the end of job, can by remaining CO 2direct injection stratum, increases reservoir energy, reduces viscosity of crude, improves output.
Equally, in straight well, also supercritical CO can be carried out 2jet flow sand washing de-plugging (see Fig. 2), its step and horizontal well similar.
Supercritical CO 2jet also can carry out sand-removing unblocking (scale removal), because supercritical CO to tubing and casing 2it is low that jet breaks rock threshold pressure, and broken rock speed is fast, and therefore it not only reduces the required pump pressure of sand-removing unblocking (scale removal), and sand-removing unblocking (scale removal) speed is fast, efficiency is high, but can not cause any harm to tubing and casing itself simultaneously.Therefore supercritical CO is used 2jet carries out tubing and casing sand-removing unblocking (scale removal) will obtain satisfied effect.Fig. 4 is supercritical CO 2tubing and casing sand-removing unblocking (scale removal) schematic diagram, scale removal with shower nozzle 35 by coiled tubing 31 lower going-into-well cylinder, 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 2jet 37, acts directly on the oil jacket pipe scale 38 be attached in tubing and casing 34, and oil jacket pipe scale is broken into dirt chip by the CO returned 2carry out pit shaft.In the step of sand-removing unblocking process, coiled tubing is transferred on sand washing limit, limit;
After bottom sand-removing unblocking operation to tubing and casing, carry coiled tubing gradually and carry out sand-removing unblocking process; When after jet flow sand washing de-plugging operation to tubing and casing top, transfer coiled tubing gradually and carry out sand-removing unblocking process, put under described and propose coiled tubing circulation 1-5 time;
When carrying out jet flow sand washing de-plugging to tubing and casing, lowering velocity and upward strain speed are 2 ~ 4 ms/min; So up and down reciprocatingly clean payzone oil jacket tube wall, in cleaning process, visible wellhead returns out the number selection termination of pumping opportunity of residue.After the end of job, can by remaining CO 2direct injection stratum, increases reservoir energy, reduces viscosity of crude, improves output.
No matter be pit shaft sand-removing unblocking or tubing and casing sand-removing unblocking (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 head body tangential direction, produces propulsive thrust like this under jet action, drives shower nozzle to rotate.Shower nozzle rotating speed regulates by the damping fluid viscosity in damping adjusting device.
3, CO 2recycle process:
Fig. 3 is band CO 2the coiled tubing supercritical CO of sealing and circulating device 2water jets horizontal well sand-removing unblocking schematic diagram.Return out the CO of well head 2solid impurity, first through desander 21, being removed, mainly for preventing the solid impurities such as grains of sand erosion back-pressure valve in flow at high speed process, then being flowed through annulus back pressure valve 11 by the mixtures of impurities such as fluid and heavy hydrocarbon, sewage, the grains of sand.The fluid-mixing removed after solid impurity enters liquid knockout 22, and carry out gas-liquid separation, the mist after separation enters CO 2gas purifier 23, to CO 2purify, pure CO 2gas is via CO 2reflux pipeline is transported to CO 2the CO of tank car 2 2storage tank 3, liquefaction after cooling, continues supply high-pressure pump group 5, reaches CO 2the object recycled.
Coiled tubing supercritical CO 2jet flow sand washing de-plugging has following advantages:
1, supercritical CO 2fluid density adjustable extent is comparatively large, by wellhead back pressure controllable bottom pressure, carries out underbalance clean-out service;
2, supercritical CO 2fluid density is high, solvability is strong, supercritical CO 2jet can not only fragmentation be deposited on shaft bottom or be attached to the gluey coagulation of the borehole wall easily, and can also dissolve macromolecule greasy dirt, cleans more thorough;
3, supercritical CO 2fluid viscosity is low, diffusion coefficient is large, and washing well process more easily penetrates into reservoir deep, clean deep formation, and comparatively the Water Jet Impact degree of depth is larger;
4, supercritical CO 2to reservoir without any pollution, after entering reservoir, can also viscosity of crude be reduced, increase reservoir permeability, improve output and recovery ratio;
5, supercritical CO 2jet is combined with coiled tubing and carries out supercritical CO 2during jet flow sand washing de-plugging, rise without the need to pressure release in lower tubular column process, coiled tubing can direct Operating Pressure, saves operation and time, while can also make CO 2continuous circulation uses, and eliminates environment pollution, reduces operating cost.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; the protection domain be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (6)

1. a coiled tubing supercritical CO 2the method of jet flow sand washing de-plugging, it is with supercritical CO 2for flushing fluid, by coiled tubing by liquid CO 2be transported in pit shaft or tubing and casing, pit shaft or tubing and casing carried out to the method for jet flow sand washing de-plugging;
The method comprises the following steps:
Drifting process: use jack rabbit drifting;
Sand-removing unblocking process: by liquid CO 2be transported in pit shaft or tubing and casing by coiled tubing, this liquid CO 2supercritical CO is become in pit shaft or tubing and casing 2fluid also carries out sand-removing unblocking by jet washing well device;
Wherein, described sand-removing unblocking process comprises following concrete steps:
CO will be stored in by high pressure line 2liquid CO in tank car 2be transported to high-pressure pump group and become high-pressure liquid CO 2, be stored in CO 2liquid CO in tank car 2pressure be 3-5MPa, temperature is-20 DEG C to 5 DEG C, described high-pressure liquid CO 2send into coiled tubing via high pressure line, arrive in pit shaft or tubing and casing and become supercritical CO 2fluid also carries out sand-removing unblocking by jet washing well device;
The method is also included in liquid towards CO in sand-removing unblocking process 2carry out the step heated.
2. method according to claim 1, wherein, the method is further comprising the steps of:
In the step of sand-removing unblocking process, coiled tubing is transferred on sand washing limit, limit;
After bottom jet flow sand washing de-plugging operation to wellbore bottom or tubing and casing, carry coiled tubing gradually and carry out sand-removing unblocking process.
3. method according to claim 2, wherein, the method is further comprising the steps of: when after jet flow sand washing de-plugging operation to pit shaft top or tubing and casing top, transfer coiled tubing gradually and carry out sand-removing unblocking process, described in transfer and on propose coiled tubing circulation 1-5 time.
4., according to the method in claim 2 or 3, wherein, when carrying out jet flow sand washing de-plugging to pit shaft, the speed transferring coiled tubing and the speed above carrying coiled tubing are 3 ~ 5 ms/min; When carrying out jet flow sand washing de-plugging to tubing and casing, the speed transferring coiled tubing and the speed above carrying coiled tubing are 2 ~ 4 ms/min.
5. method according to claim 1, wherein, the method is further comprising the steps of:
CO 2recycle process: the CO returning out well head 2mixture is successively through desander, annulus back pressure valve, liquid knockout, CO 2gas purifier, CO 2reflux pipeline is transported to described CO 2tank car.
6. method according to claim 1, wherein, described jet washing well device is rotary nozzle, and described rotary nozzle is made up of damper, head body, nozzle and rotating shaft.
CN201110359313.2A 2011-11-14 2011-11-14 Coiled tubing supercritical CO 2the method of jet flow sand washing de-plugging Active CN102777138B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201110359313.2A CN102777138B (en) 2011-11-14 2011-11-14 Coiled tubing supercritical CO 2the method of jet flow sand washing de-plugging

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201110359313.2A CN102777138B (en) 2011-11-14 2011-11-14 Coiled tubing supercritical CO 2the method of jet flow sand washing de-plugging

Publications (2)

Publication Number Publication Date
CN102777138A CN102777138A (en) 2012-11-14
CN102777138B true CN102777138B (en) 2016-01-27

Family

ID=47122229

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201110359313.2A Active CN102777138B (en) 2011-11-14 2011-11-14 Coiled tubing supercritical CO 2the method of jet flow sand washing de-plugging

Country Status (1)

Country Link
CN (1) CN102777138B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019173442A1 (en) * 2018-03-07 2019-09-12 Saudi Arabian Oil Company Removing scale from a wellbore

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104806219B (en) * 2015-04-13 2017-05-17 中国石油大学(华东) Oil and gas reservoir increased permeation and blocking removal device and increased permeation and blocking removal method thereof
CN105569619A (en) * 2015-12-10 2016-05-11 中国石油天然气集团公司 Abrasive perforating unblocking method and device for coiled tubing
CN105583202B (en) * 2015-12-19 2018-01-23 中国海洋石油集团有限公司 A kind of high-content wax sea multiphase pipeline wiper is hampered releasing method
CN106368608A (en) * 2016-08-26 2017-02-01 中国石油大学(北京) Novel method for conducting hot dry rock drilling through liquid nitrogen
CN106593329B (en) * 2016-12-20 2019-08-30 库尔勒施得石油技术服务有限公司 Gas lift reverse circulation negative pressure sand removal method and fettling installation
US10450839B2 (en) 2017-08-15 2019-10-22 Saudi Arabian Oil Company Rapidly cooling a geologic formation in which a wellbore is formed
CN109083621A (en) * 2018-07-28 2018-12-25 中国石油天然气股份有限公司 A kind of horizontal well coiled tubing composite blockage relieving method
CN109138874A (en) * 2018-10-08 2019-01-04 大庆荣氏采油技术开发有限公司 A kind of water injection well fouling cleaning method
CN109281628B (en) * 2018-10-09 2020-10-23 中国石油大学(华东) Abrasive particle jet flow blockage removal and yield increase device for continuous oil pipe
CN109723399B (en) * 2018-12-24 2020-03-31 中国矿业大学 Method for blocking removal and seepage enhancement of oil and gas well by liquid nitrogen jet

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7010037A (en) * 1969-07-09 1971-01-12
US3593800A (en) * 1969-08-25 1971-07-20 Chevron Res Apparatus for making preformed foam for use in wells
SU1423723A1 (en) * 1986-03-31 1988-09-15 Азербайджанский Научно-Исследовательский И Проектный Институт Нефтяной Промышленности Composition for cleaning well from sand plug
KR20010073425A (en) * 2000-01-14 2001-08-01 조희남 Groundwater core cleaning device and method using liquefied carbon dioxide and attached with brush and spray nozzle
CN101004132A (en) * 2007-01-04 2007-07-25 中国石油大学(华东) Exploitation technique for disgorging thick oil by pouring air to assistant steam
CN102168545A (en) * 2011-03-30 2011-08-31 中国石油大学(北京) Coiled tubing supercritical CO2 jet fracturing method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2586812Y (en) * 2002-11-07 2003-11-19 辽河石油勘探局工程技术研究院 Continuous sand flushing tool
US6988552B2 (en) * 2003-06-19 2006-01-24 Conocophillips Company Liquid carbon dioxide cleaning of wellbores and near-wellbore areas
US8257147B2 (en) * 2008-03-10 2012-09-04 Regency Technologies, Llc Method and apparatus for jet-assisted drilling or cutting

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7010037A (en) * 1969-07-09 1971-01-12
US3593800A (en) * 1969-08-25 1971-07-20 Chevron Res Apparatus for making preformed foam for use in wells
SU1423723A1 (en) * 1986-03-31 1988-09-15 Азербайджанский Научно-Исследовательский И Проектный Институт Нефтяной Промышленности Composition for cleaning well from sand plug
KR20010073425A (en) * 2000-01-14 2001-08-01 조희남 Groundwater core cleaning device and method using liquefied carbon dioxide and attached with brush and spray nozzle
CN101004132A (en) * 2007-01-04 2007-07-25 中国石油大学(华东) Exploitation technique for disgorging thick oil by pouring air to assistant steam
CN102168545A (en) * 2011-03-30 2011-08-31 中国石油大学(北京) Coiled tubing supercritical CO2 jet fracturing method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
水平井防砂管内旋转射流冲砂解堵机理与实验;黄忠伟;《石油钻采工艺》;20080630;93-96页 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019173442A1 (en) * 2018-03-07 2019-09-12 Saudi Arabian Oil Company Removing scale from a wellbore

Also Published As

Publication number Publication date
CN102777138A (en) 2012-11-14

Similar Documents

Publication Publication Date Title
US6367555B1 (en) Method and apparatus for producing an oil, water, and/or gas well
US4988389A (en) Exploitation method for reservoirs containing hydrogen sulphide
CN102828734B (en) Offshore oilfield water injection well online one-step-process acidification technology
US8475230B2 (en) Method and apparatus for jet-assisted drilling or cutting
CN100447372C (en) Shallow drill assembly with separate jet pump
CN105625946B (en) Coal bed gas horizontal well supercritical CO2Jet stream makes chamber and multistage synchronizes explosion fracturing method
US2849213A (en) Apparatus for circulating drilling fluid in rotary drilling
CN102747997B (en) Fire-flooding exploitation method used in later period of steam assisted gravity drainage (SAGD) of heavy oil reservoir
US4437706A (en) Hydraulic mining of tar sands with submerged jet erosion
CN101575983B (en) Directional fracturing permeability improvement outburst elimination method in coal mine and device thereof.
US3195634A (en) Fracturing process
Lu et al. A new method of drilling long boreholes in low permeability coal by improving its permeability
CN102628350B (en) Propane-injecting shallow heavy oil reservoir exploitation method
US20090202304A1 (en) System for treating carbon dioxide, and method for storing such treated carbon dioxide underground
CN105332684A (en) High-pressure water burst and CO2 fracturing combined coal bed gas displacement extraction technology
US3136361A (en) Fracturing formations in wells
AU2015303853B2 (en) Curaua fibers as lost-circulation materials and fluid-loss additives in wellbore fluids
CN100562645C (en) High pressure water jet-flow deep penetrating perforating and auxiliary crushing method and device thereof
CN100482918C (en) Method and device for acid exciting of underwell structure layer
US6152356A (en) Hydraulic mining of tar sand bitumen with aggregate material
CN101457640B (en) Abradant jet downhole perforation, and kerf multiple fracturing method
CN103740353A (en) Composite blocking remover and method for removing blockage of compact sandstone reservoir pressing crack commissioning horizontal well in composite manner
CN202645525U (en) Fracturing string
CN101539007B (en) Abrasive jetting device and method for abrasive jetting flow and jetting perforation and multiple fracturing
US4896725A (en) In-well heat exchange method for improved recovery of subterranean fluids with poor flowability

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant