A kind of gas well gas testing operation integrated synthesis completion method
Technical field
The invention belongs to gas field development underground work technical field, and in particular to a kind of gas well gas testing operation integrated synthesis
Completion method.
Background technology
Ordos Basin gas field reservoir series of strata are more, and straight well individual well need to transform interval at 3-5 layers, and conventional transform pattern is adopted
Transformed with mechanical delamination fracturing string, scope of construction item is limited by tubing size, and fracturing string is directly used after transformation
Tested, produced, which seriously affects the production and workover treatment in later stage.Big cluster well clump takes batch production gas testing
Since pressing crack construction, though construction efficiency increases, do not have yet from raising construction safety and holding wellbore integrity etc.
Improved.
In addition, be limited to the coordination between each resource in scene, the problems such as still occurring that inter process is unnecessary etc. frequently and stop.And
And under traditional gas testing work pattern, there are personnel labor intensity is big, operating risk is high, the degree of automation is low, well control risk is high,
And organization of production is difficult to realize the drawbacks such as division of labor based on specialization, pipelining.
Therefore, it is necessary to which existing process technology, device resource are integrated, the reservoir of a set of suitable long celebrating gas straight well is formed
Reforming technology and completion method, thoroughly solve the transformation of gas well straight well and the optimization problem of gas producing technology tubing string, are solved from source
The transformation of gas well, maintenance, well workover problem.
The content of the invention
The purpose of the present invention is overcoming drawbacks described above existing in the prior art, by optimizing to production organizational mode, integrate
The existing resource such as gas testing, pressure break, continuous pipe, Operating Pressure, forms gas well gas testing operation integrated synthesis well-completing process, so that full
The sufficient high discharge capacity mixing water pressing crack construction of the more series of strata of tight gas, improves collecting well group fracturing work efficiency, and pit shaft is complete after keeping pressure
Property, the adaptability of gas well operation tubing string is improved, extends the gas well liquid loading cycle;At the same time gas well gas testing operation field is further improved to apply
Work efficiency rate and construction safety, are finally reached cost efficiency purpose, and the transition and upgrade for underground work during gas field development provides
One new thinking.
Technical solution provided by the invention is as follows:
A kind of gas well gas testing operation integrated synthesis completion method, comprises the following steps:
Step 1)Prepare before boring:Well site road is reconnoitred, is safeguarded, and determines modification scheme;
Step 2)To construction infrastructure resettlement, and carry out well site preparation;
Step 3)Coiled tubing is installed from bottom to top in well head, carries out continuous pipe through wash well operations;
Step 4)Pressing crack construction is carried out using continuous tube underseal dragging separate stratum fracfturing method;
Step 5)Open flow, test jobs are carried out to gas well;
Step 6)Band pressure minor diameter tubing or lower speed pipe, wherein minor diameter tubing outside diameter are less than two cun seven.
The construction infrastructure includes fire fighting device, security protection facility, lives people room, power generation room, toolhouse and water pot, described
Well site prepares to include relief line connection, well site fence protects, well site is smooth and build combustion cell.
Step 3)Described in the detailed processes of continuous pipe through wash well operations be that coiled tubing is installed from bottom to top in well head,
With continuous tube gauguste cutter, after drifting to artificial bottom of a well, direct flushing to qualification, pressure testing is carried out to pit shaft and well head.
The discharge capacity of the direct flushing is more than 600L/min, continuously circulates more than 1.5 times of hole volumes, described just follows
Washing-round well is qualified to be less than 0.2% to return out flushing fluid content of impurities.
Pit shaft replaces perforating fluid after further including well-flushing.
Step 4)Described in continuous tube underseal dragging separate stratum fracfturing detailed process be, fracture well head from top to bottom according to
Secondary connection injection head, continuous pipe open flow device group, lubricator, injection well head, flap type and four-way junction of casing are assembled, and connect underground
Tool string in coiled tubing lower end, after the completion of carry out pressure testing, pressure release after pressure testing qualification, lower coiled tubing, calibration coiled tubing is deep
Degree, and perforated interval collar depth nearby is found out, determine perforation fragment position, pumping note program according to construction is successively continuously managed
Drag fracturing is constructed, and after pressing crack construction, rectifies and improves well head.
The pressure testing operating process is as follows, 4-20MPa voltage stabilizings 5 minutes, 65MPa voltage stabilizings 10min;Flap type is tried
Pressure, suppresses 50MPa, lasts 30min pressure and is dropped by less than 0.7MPa as qualification;Pressure testing is carried out to injection well head, lubricator, according to
15MPa, 35 MPa, 50MPa boost steadily, 15MPa, 30MPa voltage stabilizing 10min, pressure decline≤0.5MPa, 50MPa voltage stabilizings
20min, pressure decline≤0.7MPa are qualification.
Step 6)Minor diameter tubing under the middle apparatus for work using pressure, using coiled tubing unit running speed pipe with pressure.
The minor diameter tubing or speed pipe are operation tubing string.
Cement the well for full-sleeve.
The beneficial effects of the invention are as follows:The present invention substitutes traditional drifting, well-flushing, pressure testing work using continuous pipe through wash well operations
Sequence, the dragging separate stratum fracfturing of continuous tube underseal replaces traditional perforation, fracturing to bore, pressure break process, after pressing crack construction, according to
Pit shaft gas production and discharge opeing situation, selective lower completion tubular column with pressure(Minor diameter tubing)Or lower speed pipe, no major diameter are bored
Tool, wellbore integrity is good, improves the adaptability of gas well operation tubing string, extends the gas well liquid loading cycle, for later stage workover treatment of going into operation
Provide convenience condition.
Production organizational mode is optimized, the existing resources such as gas testing, pressure break, continuous pipe, Operating Pressure is integrated, forms gas well examination
Gas operation integrated synthesis well-completing process, so as to meet the high discharge capacity mixing water pressing crack construction of the more series of strata of tight gas, improves cluster well
Group fracturing work efficiency;Gas well gas testing operation field construction efficiency and construction safety are further improved at the same time, is finally reached drop originally
Synergy purpose.
It is described in further details below in conjunction with attached drawing.
Brief description of the drawings
Fig. 1 is gas well gas testing operation integrated synthesis well-completing process flow diagram of the present invention;
Fig. 2 is continuous pipe pressing crack construction wellhead assembly connection diagram of the invention;
Fig. 3 is well head schematic diagram after pressing crack construction of the present invention;
In figure:1st, injection head;2nd, continuous pipe open flow device group;3rd, lubricator;4th, well head is injected;5th, flap type;6th, four-way junction of casing;7、
Big four.
Embodiment
Embodiment 1:
A kind of gas well gas testing operation integrated synthesis completion method as shown in Figure 1 is present embodiments provided, is comprised the following steps:
Step 1)Prepare before boring:Well site road is reconnoitred, is safeguarded, and determines modification scheme;
Step 2)To construction infrastructure resettlement, and carry out well site preparation;
Step 3)Coiled tubing is installed from bottom to top in well head, carries out continuous pipe through wash well operations;
Step 4)Pressing crack construction is carried out using continuous tube underseal dragging separate stratum fracfturing method;
Step 5)Open flow, test jobs are carried out to gas well;
Step 6)Band pressure minor diameter tubing or lower speed pipe, wherein minor diameter tubing outside diameter are less than two cun seven.
The present invention substitutes traditional drifting, well-flushing, pressure testing process, the dragging of continuous tube underseal using continuous pipe through wash well operations
Separate stratum fracfturing replaces traditional perforation, fracturing to bore, pressure break process, after pressing crack construction, according to pit shaft gas production and discharge opeing feelings
Condition, selective lower completion tubular column with pressure(Minor diameter tubing)Or lower speed pipe, no major diameter drilling tool, wellbore integrity is good, carries
The adaptability of high gas well operation tubing string, extends the gas well liquid loading cycle, and to go into operation, later stage workover treatment is provided convenience condition.Fig. 1
In two at be respectively traditional through wash well operations and fracturing work in dotted line frame.
Embodiment 2:
On the basis of embodiment 1, a kind of gas well gas testing operation integrated synthesis completion method is present embodiments provided, it is described to apply
Work infrastructure includes fire fighting device, security protection facility, lives people room, power generation room, toolhouse and water pot, and the well site prepares to include putting
The connection of jet pipe line, the protection of well site fence, well site is smooth and builds combustion cell.
After drilling completion, underground work unit connects well and comes into effect gas well gas testing operation integrated synthesis well-completing process.
Prepare to include reconnoitring well site road, safeguarding before boring, and determine modification scheme.Due to the pressing crack construction mode in the present invention
Injected using annular space, it is desirable to casing pressure-bearing 60MPa, therefore corresponding construction well is necessary for full-sleeve well cementation.Handed over from drilling crew field
Upper well reconnoitres upper well route in advance after connecing, for that cannot meet Construction traffic(Especially coiled tubing unit)The road of upper well construction
Section and well site are widened and are safeguarded using engineering truck.
Well site is not required to resettlement derrick, tractor hoist, well control facility when moving, need to only move fire fighting device, security protection facility, live in people
A small number of construction infrastructure such as room, power generation room, toolhouse and water pot;Well site set-up procedure is real by well in specialized ground service team
Apply, its work be mainly the rectification in well site, the connection of ground flow, production cistern or the preparation of water pot, open flow combustion cell or
The preliminary preparations such as the preparation of burn pot;Applied after the completion of the preparation of well site by well adapter well site in coiled tubing unit group
Work, its work include the pit shaft preparations such as lower continuous pipe drifting, well-flushing, wellbore pressure test, then more change to well drilling tool, lower band bottom
Envelope dragging separate stratum fracfturing instrument, carries out separate stratum fracfturing construction;After pressing crack construction, continuous pipe and underseal instrument string out well
Cylinder, pit shaft start normal open flow discharge opeing, and during which well installs Operating Pressure equipment on Operating Pressure unit, are tried according to gas well open flow
Gas Yield selection carries out band pressure operation tubing string(Minor diameter tubing or speed pipe)Operation;Open flow, test and complete are carried out afterwards
Well works.
Wherein, open flow detailed process is:
(1)First time open flow requirement after pressure:
1. the closed-in time requires after pressure:Closing well is needed on the premise of open flow effect is not influenced, after pressure for a period of time, is made fully anti-
Should.If termination of pumping pressure is higher than 20.0MPa, and pressure drop amplitude is no more than 5.0MPa/ half an hour, can closing well more than 40 minutes;Such as
Fruit termination of pumping pressure less than 15.0MPa or pressure drop quickly, can open flow immediately;If termination of pumping pressure is in 15-20MPa, visual pressure
Decline situation closing well 20-40 minutes.
2. open flow pressure and the requirement of open flow amount:First time open flow after pressure, since pit shaft is hydraulically full, head of liquid is contentedly
Layer back pressure requirement, can be without considering the height of oil pressure, but during first open flow, to control needle-valve open flow discharge capacity is must not exceed 300L/
Min, makes well head pressure slowly decline.
(2)It is normal to close rafting liquid requirement
1. pit shaft substantially has the open flow requirement in the case of mixed air column:When pit shaft substantially has aerated fluid column, discharge opeing effect is not being influenced
In the case of, it can be put according to liquid measure magnitude estimation head of liquid under conditions of ensuring shaft bottom producing pressure differential within 8.0MPa
Discharge opeing is sprayed, closing well immediately when not going out liquid.
2. the open flow requirement in discharge opeing later stage:In the discharge opeing later stage, aerated fluid amount is less in pit shaft, can by wellbore pressure gradient 1.6 ~
2.4MPa/1000m estimation, producing pressure differential should be controlled within 4.0MPa.
3. relatively low for reservoir productivity, shut-in pressure recovers relatively low well, and when wellhead shut-in pressure is less than 5.0MPa, oil is put
Can not control pressure;For wellhead shut-in pressure in 5.0-10.0MPa, oil puts minimum pressure control in more than 1.0MPa;Well head
When shut-in pressure is more than 10.0MPa, performed by 2. bar.
(3)During open flow it is continuous 2 ~ 3 it is small when do not go out liquid, you can with closing well, open flow again after getting up etc. pressure recovery;It is if continuous
More than when open flow 5 is small twice, do not go out liquid, and oil jacket pressure reaches in a basic balance in a short time after closing well, or the production of definite stratum
Liquid, and fluidity is stablized, then discharge opeing is qualified, can be transferred to closing well.
The data that open flow discharge opeing should enroll:Open flow time, pin valve opening, oil pressure, casing pressure, ejection liquid measure, fluidity(Density,
PH value, chloride ion content), the length of flame, color.Dilute after well head pressure record is close before requiring, general closing well is every in one hour
Every 3-5 minutes record oil jacket pressure once, later interval time suitably relaxes, but most long must not exceed 2 hour records once.
If being unable to blowing, using the timely discharge opeing of lift mode, gas lift liquid drainage construction procedure and points for attention:
(1)Gas lift liquid drainage mode:Annular air injection, oil pipe discharge opeing;
(2)Debris in ground injecting gas pipeline is cleaned, prevents foul from blocking gaslift valve opening;
(3)Before opening well head gas injection gate, link ground injecting gas pipeline and casing injection gate, ground injecting gas pipeline pressure testing
25MPa, it is ensured that do not leak;
(4)Well head does not allow installation control oil nozzle in discharge opeing process, and outlet valve is shown in a fully open operation;
(5)Discharge opeing:Open oil pipe gate and sleeve gate(Record oil jacket pressure), start nitrogen car gas injection processed, control discharge capacity exists
600-1200m3Between/h, until having a large amount of gas-liquids to mix out in oil pipe, oil jacket annular pressure is about 25MPa at this time;With oil pipe
Interior a large amount of gas-liquids are mixed out, and annular pressure is begun to decline;
(6)Gas injection process equipment must be carried out continuously work;
(7)In gas injection process, pay attention to observing change in pressure drop, judge gas lift valve open position, record injection pressure, tolerance and discharge
Liquid measure;
(8)Record the oil pressure in work progress, casing pressure, return lifting rate.
Production test detailed process:
After closing well recovery pressure reaches test request, static bottom-hole pressure is surveyed on request, to connecting separator, orifice flow before test
Meter and test line, and suitable orifice plate is selected according to oil jacket pressure situation of change in discharge opeing process.Each pipe joint is fastened at the same time,
Check earth anchorage situation, and carry out pressure testing, guarantee, which is not pierced, does not leak;Water and preheated on separator.Separator goes out away from test line
Mouth have to be larger than 20 meters, and test line cannot be connected with any elbow, and orifice flowmeter have to be larger than 10 meters away from separator, away from point
10 meters of burner.
(1)Critical speed flowmeters test yield formula:
Qg=186×d2×P1/(Z×r×T)½
In formula:Qg=daily output tolerance, m3/d;
D=orifice plate diameter, mm;
P1=POn/0.0980665+1;POnFor upper meter pressure, MPa;
Z:The compressed coefficient, gas sample analysis is drawn, generally in 0.97-1.0;
T:Upper temperature, T=t+273 DEG C, t is upper temperature meter reading;
r:Specific gravity of natural gas, gas sample analysis is drawn, generally in 0.56-0.60;
Application conditions:Critical flow velocity must be reached by the air-flow of orifice plate, the condition that air-flow reaches critical flow velocity is downstream pressure
It is less than or equal to 0.546 with the ratio of upstream pressure, or upstream pressure is greater than or equal to 0.2MPa.
(2)Orifice type critical flow prover tests yield formula:
1. when pressure differential is measured with water-column:
Qg=2.89×d2×[HWater/(r×T)]½
Application conditions:It is less than 3000m suitable for measurement3The air flow rate of/d.
2. when pressure differential is measured with mercury pressure:
Qg=10.64×d2×[HMercury/(r×T)]½
Application conditions:Suitable for measuring 3000--8000m3The air flow rate of/d.
Wherein:HWater、HMercuryFor the difference in height of water in " u "-shaped pipe or mercury, unit mm, remaining parameter and critical speed flowmeters
Calculating parameter is identical.
(3)The data of production test admission:Oil pressure, casing pressure, pin valve opening, flowmeter title, orifice plate(Baffle)Diameter, on
Flowing pressure, upper temperature, oil gas water class's yield, fluidity, the length of flame, color, the testing time, stabilization time, stratum static pressure,
Formation flow pressure, temperature etc..
(4)The phase takes gas sample to carry out natural gas proximate analysis after a test, if having water and condensate output, answers sampling analysis.
Embodiment 3:
On the basis of embodiment 1, a kind of gas well gas testing operation integrated synthesis completion method, step 3 are present embodiments provided)
Described in the detailed processes of continuous pipe through wash well operations be that coiled tubing is installed from bottom to top in well head, with continuous tube drifting
Rule, after drifting to artificial bottom of a well, direct flushing to qualification, pressure testing is carried out to pit shaft and well head.
The discharge capacity of the direct flushing is more than 600L/min, continuously circulates more than 1.5 times of hole volumes, described just follows
Washing-round well is qualified to be less than 0.2% to return out flushing fluid content of impurities.
Detailed process is:1. through wash well well head is installed:Coiled tubing through wash well is from bottom to top:Wellhead casing pipe four-way 6+ is flat greatly
Plate valve 52+coiled tubing preventer group+injection head 1.
2. coiled tubing drifting:The gauguste cutter being adapted using suitable dimension continuous tube and wellbore casing, drifting to people
Work shaft bottom.Tag in fact it is errorless after, then adjust well-flushing drilling tool position, it is desirable to which the difference of well-flushing drilling tool position and drifting position is not
More than 3.0m.If drifting midway is hampered, blocks, no more than 10-20KN, steady activity tubing string, forbids to pause suddenly, puts suddenly for suspending weight decline
And hard pressure, make gauguste cutter slowly by when spudding action is without blocked portion, continuing downward drifting.
3. well-flushing and pressure testing:Drilling tool is adjusted to shaft bottom above 2-3m after drifting qualification.Prepare to wash by using design requirement
Well liquid, and by design well-flushing formula of liquid and enough additives(0.30%TGF-1+1.0%KCl+ clear water, prepares liquid measure and is generally
2 times of hole volume).Using direct flushing, it is desirable to discharge capacity is more than 600L/min, continuously circulates more than 1.5 times of hole volumes,
It is washed till qualification(Flushing fluid content of impurities is returned out less than 0.2%).
4. after well-flushing, pit shaft replaces perforating fluid, perforating fluid composition(Clear water+0.1%EM30S+0.5%TOS-1).
5. after well-flushing qualification, position of tagging in fact, verifies relevant rudimentary data, act coiled tubing and drifting work
Tool.
6. carrying out pressure testing to pit shaft and well head by design requirement, boost steadily according to 30MPa, 50MPa, 30MPa voltage stabilizings
10min, pressure decline≤0.5MPa, 50MPa voltage stabilizing 20min, pressure decline≤0.7MPa are qualification.
Embodiment 4:
On the basis of embodiment 1, a kind of gas well gas testing operation integrated synthesis completion method, step 4 are present embodiments provided)
Described in continuous tube underseal dragging separate stratum fracfturing detailed process be, fracture well head be sequentially connected from top to bottom injection head 1,
Continuous pipe open flow device group 2, lubricator 3, injection well head 4, flap type 5 and four-way junction of casing 6 are assembled, connection underground tool string in
Coiled tubing lower end, after the completion of carry out pressure testing, pressure release after pressure testing qualification, lower coiled tubing, calibration coiled tubing depth, and finding out
Collar depth, determines perforation fragment position near perforated interval, and pumping note program according to construction successively carries out continuous pipe drag fracturing
Construct, after pressing crack construction, rectify and improve well head.
Well head 4, assembling lubricator 3 are injected in installation on flap type 5 in the dragging separate stratum fracfturing of continuous tube underseal, such as Fig. 2
Shown, its package assembly is from bottom to top:Wellhead casing pipe four-way 6(Row is returned for casing), flap type 5 two, continuous pipe pressure break
Annular space injection well head 4, continuous pipe big orifice lubricator 3, big orifice lubricator 3 connect adapter flange, continuous pipe preventer group and
Injection head 1 is sequentially connected.
Tool assembling structure is under continuous pipe well:Underground tool string is connected in coiled tubing lower end, downhole tool configuration by
Under to being above followed successively by:Righting-oriented device(Downhole tool introduces, and plays guiding and centralizing function), mechanical collar locator(Utilize set
Tube coupling hoop carries out construction interval and is accurately positioned), packer(Close oil jacket annular space), waterpower spray gun(It is former using small perforations high flow rate
Reason carries out hydraulic jet perforation, is shot through casing and cementing concrete ring), safety joint(It is general to have mechanical and two kinds of fluid pressure type, mesh
Be that can take off instrument in time when surprisingly occurring in bit freezing and string out continuous pipe), continuous pipe fitting(Slip-type generally is used,
One end is connected using slips with continuous pipe, and the other end is the screw thread to match with instrument button-type, connects bottom tool string)With it is continuous
Pipe is sequentially connected to well head.
Specific operation process:
1. fracture well head installation, assembling underground fracture instrument, pressure testing
In fracture well head installation, assembling injection well head 4 and lubricator 3, connection underground tool string in coiled tubing lower end, after the completion of
Pressure testing again.Carry out pressure testing, 14-20MPa voltage stabilizings 5 minutes, 65MPa voltage stabilizings 10min again to mounted continuous oil pipe device.
Pressure testing is carried out to flap type 5, it is desirable to suppress 50MPa, last 30min pressure and be dropped by less than 0.7MPa as qualification.To injecting well head
44th, lubricator 33 carries out pressure testing, boosts steadily according to 15MPa, 35 MPa, 50MPa, 15MPa, 30MPa voltage stabilizing 10min, pressure
Decline≤0.5MPa, 50MPa voltage stabilizing 20min, pressure decline≤0.7MPa are qualification.
2. lower continuous pipe, continuous Guan Jiaoshen
Pressure release after pressure testing qualification, lower coiled tubing.Continuous pipe passes through well head with the speed less than 3m/min down;Improve lower continuous pipe
Speed, it is maximum no more than 15.5m/min;During the continuous pipe of tripping in, direct circulation is carried out at the same time with 0.2m3/min pump speeds, liquid is
Virgin rubber base fluid, to keep continuous tube temperature degree and prevent downhole tool from blocking.And well liquid within the cartridge is substituted for virgin rubber base fluid.
Coiled tubing school is deep, and short sleeve position is found out by mechanical casing collar locator, calibration coiled tubing depth,
And collar depth near perforated interval is found out with this, accurately determine perforation fragment position.Specific implementation is as follows:It is lowered into short sleeve
Following 20m or so, above carries continuous pipe with the speed of 5m/min, measures casing collar location;Slowly above carry continuous pipe measure casing
Notice that observation puies forward tuple evidence during collar location;Crossed when measuring casing coupling and put forward scope in 1,000-10,000lbs(0.45t-
4.5t)Between;Carry excessive if crossed, with 0.2m3/min pump speed direct circulations, clean presumable debris;Done on continuous pipe short
The mark of sleeve position, is subject to short sleeve hoop position, the continuous pipe depth of calibration;Casing is counted one by one since short sleeve to connect
Hoop, until visiting untill the casing collar location nearest from perforation fragment position;Casing collar location be subject to again to continuous pipe
Depth calibration, is above carried or transferred continuous pipe to after perforated interval, made marks using different paints on continuous pipe;Repeat above step
All perforation fragment positions are leant out one by one to be marked using different paints.
3. continuous pipe drag fracturing construction
Program is noted according to the pump in detail design(Include pad stage, load fluid stage, displacement fluid stage)Successively(Section)Into
The continuous pipe drag fracturing construction of row, Specific construction parameter(Operational discharge capacity, sand ratio, liquid measure and liquid properties parameter request are according to list
Well reservoir asks production situation to determine)Performed by design requirement.
4. play continuous pipe and fracturing tool string, rectification well head
After pressing crack construction, closing well.Continuous pipe is above carried, speed is less than 15m/min;When away from well head 300m, raise speed in reduction
Degree, when away from well head 30m, 3m/min is not to be exceeded in upward strain speed, until downhole tool is proposed well head;Close well head main valve;
Release the pressure of continuous pipe, lubricator 33 and preventer;Continuous tube apparatus is dismantled;Dismantle downhole tool;Dismantle fractured well
Mouthful, well head is rectified and improved:KQ65-70 big four 7+ flap types 5, as shown in Figure 3.
Embodiment 5:
On the basis of previous embodiment, tripping in minor diameter tubing construction process with pressure is followed successively by:Install safe preventer group and
Operating Pressure machine, manifold connection and pressure testing, lower oil pipe(Blanking plug is bored under afterbody oil pipe band), lower hanger, dismounting Operating Pressure
Device, safe preventer group, install christmas tree, destroy blanking plug, completion.Specific construction process and requirement are constructed by Operating Pressure
Design performs.
Speed pipe tripping in job execution flow is followed successively by:Preparation of construction, drifting, relocation equipment and installation, tear well head, installation open
Hanger, installation operation window, preventer, injection head 1, dress blanking plug, pressure testing, tripping in continuously manage, set hanger, Pipe Cutting, tear open
Wellhead assembly and Pipe Cutting, righting are unloaded, the mouth of pipe is repaiied, recovers well head christmas tree, makes blanking plug.
Operation purpose:Using S-9 operation device under pressure, two cun of three minor diameter tubing of tripping in pressure is as operation tubing string;Or
Using coiled tubing unit running speed pipe with pressure as operation tubing string.Reservoir damage caused by avoiding conventional squeezing kill-job operation
And problem of environmental pollution, reduce gas reservoir damage, improve recovery ratio.
The tripping in of operation tubing string lifts KQ78/65-70 well head christmas trees after constructing, and is attached, brings all on request
Tight flange bolt, christmas tree are installed in place, completion.
The structure and the known or common technology of the assembling process category industry that the present embodiment does not describe in detail, differ here
One narration.
The foregoing examples are only illustrative of the present invention, does not form the limitation to protection scope of the present invention, all
It is to be belonged to the same or similar design of the present invention within protection scope of the present invention.