CN102134979A - New method for forming manual well wall in oil and gas well by water-absorbing resin - Google Patents
New method for forming manual well wall in oil and gas well by water-absorbing resin Download PDFInfo
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Abstract
The invention relates to a new method for forming manual well walls in an oil and gas wells by water-absorbing resin. In the method, the water-absorbing resin is mixed with freshwater or saline to form a well completion fluid or a workover fluid; the water-absorbing resin is starch-type water-absorbing resin or cellulose-type water-absorbing resin or synthetic water-absorbing resin and comprises the following components by weight percentage: 1 to 2% of water-absorbing resin, 0.2 to 0.5% of water-absorbing initiator, 0.2 to 0.5% of colloid protective agent, and the remaining quantity of water or monovalent saline. The density of the water-absorbing resin well-completion fluid or the workover fluid can be adjusted by adding monovalent salt NaCl or KCl; the solution apparent viscosity can be controlled by adjusting the concentration of the water-absorbing resin; and the dosage of the well completion fluid or the workover fluid can be designed according to the volume of a shaft. In the method, the physical and the chemical changes can occur under the high temperature to form a manual well wall, namely a gelatine temporary plugging layer; therefore, the bearing capability of the high-and low-pressure stratum can be effectively improved; the leakage of the well completion fluid or the workover fluid can be prevented at the producing layer, the operation safety and the capacity of the oil and gas well can be ensured, the construction technology is simple, and the cost is relatively low.
Description
Technical field
The present invention relates to a kind ofly be used for shorting or debilitating exploitation oil-gas reservoir is carried out in completion and the workover treatment to the protection reservoir, reduced production costs, shortens construction period the oil gas well, utilize water-absorbing resin to form the new method of artificial borehole wall at the oil gas well.
Background technology
Many oil gas fields of China have entered the exploitation middle and later periods, owing to short or the debilitating exploitation, the formation pressure gradient of main payzone has been significantly less than the original formation pressure gradient, even may be lower than water column pressure.In this case, as carrying out completion and workover treatment to the oil gas well, in operation process, the obstruction to payzone of a large amount of leakages of completion fluid and workover fluid and solid phase certainly will take place, make that the oil gas well capacity significantly reduces after the operation.Be more seriously, make the part well can not realize completion or well workover, make the oil gas well scrap (particularly gas well) prematurely owing to can not set up circulation.
If shake out,, have to adopt and drag for the sand operation owing to can not adopt the sand washing operation for this type of oil gas well, because duty cycle is long, the cost height, formation damage is serious, recover reasons such as production capacity time lag, cause operational benefit low, can not realize the purpose of workover treatment well.
Oil gas well operations difficulty for the multiple pressure power series of strata that have high pressure zone and low pressure layer simultaneously is just bigger.The safety that guarantees the high pressure payzone just must be with the pressure coefficient design completion fluid of this layer and the density of workover fluid, so just certainly will cause too high positive differential pressure at the low pressure layer, make completion fluid or workover fluid that a large amount of leakages take place, a large amount of leakages can make the oil gas of high pressure zone enter in the well again, form the complex situations of suffering from vomiting and diarrhoea.Not only influence the production capacity after oil gas well completion or the well workover, and can form great security threat, even the major accident of blowout and well slough occurs operation process.
Above technological difficulties have caused the duration of this type of oil gas well operations and the rising significantly of cost, even more serious consequence be since completion fluid and workover fluid liquid phase enter oil-gas Layer in a large number, changed the pit shaft water saturation of payzone on every side, and cause the interior all kinds of sensitiveness of payzone to damage, make oil gas well production capacity after operation descend significantly, greatly reduce the development benefit and the ultimate recovery of oil gas field.
Completion and well workover problem at the low pressure oil gas well exist the following system and construction technology at present.
1, the Spume Well Killing Liquid system (CN1782322A, CN101544884A)
The Spume Well Killing Liquid system is by adding surfactant in liquid, charges into inert gas and forms foam system, and this system least density can reach 0.4g/cm
3, add the density that tolerance is come the hierarchy of control by adjusting.This system is used in normal pressure and low pressure oil well completion and workover treatment, can reduce the leakage of liquid significantly, positive differential pressure to the stratum is less, be again no solid system simultaneously, can control the formation damage that completion fluid and workover fluid cause to a great extent, be the good system of a kind of normal pressure and low pressure oil well completion and well workover.The problem of its existence is: (1) stable period is short, and Spume Well Killing Liquid in case lost efficacy, can cause excessive positive differential pressure at 24～48 hours stabilization time, liquid takes place miss in a large number; (2) technology is comparatively complicated, use special liquid dispensing device and multiple additives, such as foam maker, and system nitrogen equipment etc., cost is higher; (3) big for environment pollution, the discharging of foam system after the end of job can cause the large-area foam pollution in ground.
2, the stifled temporarily type well killing fluid system of solid phase (CN1047686A, CN1053631A)
In completion fluid and workover fluid, add with the stifled temporarily material of the rigidity of reservoir pore throat compatibility and just formed the stifled temporarily type well killing fluid system of solid phase, in case the advantage of this system is a temporarily blocking layer form after, can prevent the leakage of completion fluid to a great extent at normal pressure and low-pressure stratum, and can bear higher positive differential pressure, this system construction technology is simple, and cost is lower.Its shortcoming is: will carry out special pickling operation after (1) end of job and just can resume production, increase operation procedure, prolong the activity duration; (2) solid phase in the completion fluid can enter payzone, and smaller particles can enter the hole and ooze payzone inside preferably under the effect of positive differential pressure, forms the obstruction in the payzone, influences production capacity; (3) polymer of completion fluid can damage payzone, and high-viscous liquid enters payzone on the one hand, is difficult to anti-row, and polymer can be adsorbed on the rock particles surface on the other hand, dwindles the area of runner, reduces the permeability of oil phase.
3, no solid phase clear brine well killing fluid system
Clear brine is mainly as completion fluid, workover fluid and packer fluids, and this mainly is that its advantage also shows and can effectively suppress clay swell and little sticking migration, with reservoir good compatibility arranged because this class fluid does not need to control liquid column hydrostatic pressure by the suspension solid phase.Such completion fluid is not owing to contain bentonite and other any solid phase, and density is by adding dissimilar and soluble inorganic salt quantity is regulated, and the inorganic salts of selecting for use comprise NaCl, KCl, CaCl
2, NaBr, KBr, CaBr
2, ZnBr
2With HCOONa etc.
This system is mainly used in extended reach well, horizontal well and sleeve pipe underreamer at present, the reservoir bare area is big, long time of contact with fluid, particularly to the low porosity and low permeability gas reservoir, the water trap extent of damage still can compare seriously, even adding cleanup additive effect is also not necessarily desirable.For conventional well, generally adopt perforation and pressure break mode to reduce formation damage; But for extended reach well, horizontal well and sleeve pipe underreamer, these methods are not necessarily feasible, and especially at sea special formation or unconsolidated formation are all the more so.
In addition, this system can not finely prevent the leakage of completion fluid in the gas well completion process, even the density of completion fluid is controlled to rolling off the production line that the gas well well control requires, at the deep-well of some strata pressure disorder, may also can produce the positive differential pressure of nearly 10MPa.For operation on the sea, generally do not adopt perforation operation continuous cropping, therefore need kill-job, completion process behind the perforation reaches several days, even leakoff rate is very low, wastage also can reach tens sides, even it is higher, this is a sizable amount for the low porosity and low permeability reservoir, can invade the deep of reservoir, the water trap infringement of aggravation gas-bearing formation.
4, glue well killing fluid system (CN1048737A, CN1526788A)
In the completion and workover treatment of low pressure oil gas well, in order to reduce the leakage of completion fluid, realize the purpose of circulation well cleanup, often reduce the leakage of well killing fluid by the viscosity that improves completion fluid, this has just formed the glue completion fluid system.This type of system can not prevent leakage fully, just because the increase of liquid viscosity, slowed down the leak-off velocity of completion fluid, therefore its defective is fairly obvious: at first because still existence of leakage, enter the infringement that payzone causes so can not prevent liquid phase, secondly because the use of polymer causes the absorption infringement of polymer.It is pointed out that the increase owing to liquid phase viscosity, the capillary infringement that liquid phase causes is with even more serious.
5, snubbing serving (CN201106431Y, CN201095977Y)
At the reservoir protection problem in normal pressure and low pressure oil well completion and the well workover process; some oil gas fields adopt snubbing serving; the problem that exists is: (1) snubbing serving risk is big; owing to there is the danger of blowout; high-pressure oil-gas well; particularly hydrogen sulfide containing gas well should not adopt snubbing serving.When the low pressure oil gas well carries out snubbing serving, also to note preventing blowout; (2) special well head equipment and blowout prevention equipment need be rented or introduce to snubbing serving, and cost is bigger.
Summary of the invention
The object of the present invention is to provide the new method of utilizing water-absorbing resin to form artificial borehole wall at the oil gas well, this method is at the deficiencies in the prior art, add supernatant water or salt solution is configured to completion fluid or workover fluid with water-absorbing resin, water-absorbing resin completion fluid or workover fluid generation physics and chemical change form artificial borehole wall (colloid temporarily blocking layer) under the high temperature that (as perforation) between reservoir temperature or operational period produces, improve the bearing capacity of low-pressure stratum, prevent the leakage of completion fluid or workover fluid at payzone, guarantee job safety and oil gas well capacity, construction technology is simple, and cost is cheap relatively.
For reaching above technical purpose, the invention provides following technical scheme.
A kind of new method of utilizing water-absorbing resin in the oil gas well, to form artificial borehole wall, be mainly used in and short or the completion or the workover treatment of low-pressure stratum oil gas well, mainly be according to oil gas well geologic characteristics, formation pressure gradient, well temperature, well depth parameter, formulate the overall plan of kill-job or well workover, satisfy the principle of safe construction according to the density design of completion fluid or workover fluid, configure completion fluid or workover fluid on ground, satisfying under the prerequisite that the scene pumps into the equipment requirement, adjusting the concentration of water-absorbing resin and control its viscosity; Design completion fluid or workover fluid consumption according to hole volume.Owing to contain the completion fluid of water-absorbing resin or the performance that workover fluid has irreducible water, when liquid arrived the oil-gas Layer position, water-absorbing resin completion fluid or workover fluid generation physics and chemical change formed artificial borehole wall, thereby can not miss.
Utilize water-absorbing resin in the oil gas well, to form the new method of artificial borehole wall, comprise following steps successively:
(1) preparation water-absorbing resin completion fluid or workover fluid, this completion fluid or workover fluid comprise component and consumption is as follows:
Water-absorbing resin 1～2 weight %,
Suction initator 0.2～0.5 weight %,
Colloid protective agent 0.2～0.5 weight %,
All the other components are water or monovalence salt solution;
(2) pipe cleaning well-flushing replaces earlier into conventional completion brine or workover fluid, and then replaces into water-absorbing resin completion fluid or workover fluid to purpose well section;
(3) carry out perforation or other operations at the oil gas interval;
(4) pipe cleaning well-flushing after the end of job replaces out the water-absorbing resin completion fluid or the workover fluid of oil-gas Layer section in the well with conventional completion brine or workover fluid.
Among the present invention, described water-absorbing resin is starch based water-absorbing resin, cellulose family water-absorbing resin or synthetic water-absorbing resin.
Described starch based water-absorbing resin is starch and acrylonitrile graft copolymer, modified starch and acrylonitrile graft copolymer or starch and acrylates graft copolymer;
Described cellulose family water-absorbing resin is cellulose-acrylates graft polymers, cellulose and acrylamide graft polymer or cellulose and acrylonitrile grafting polymer;
Described synthetic water-absorbing resin is homopolymers water-absorbing resin, copolymer water-absorbing resin or inorganic matter composite water absorbing resin, described homopolymers water-absorbing resin is polyacrylate, polyacrylamide or polyvinyl alcohol, and described copolymer water-absorbing resin is acrylic acid-acrylamide copolymer, acrylate-vinyl acetate alcohol copolymerization hydrolysate or AA-E alcohol copolymer; Described inorganic matter composite water absorbing resin is Sodium Polyacrylate-kaolin compound resin, polyacrylic acid potassium-swell soil compound resin or the compound montmorillonite resin of acrylamide and acrylic acid copolymer.
Among the present invention, described suction initator is a triethanolamine.
Among the present invention, described colloid protective agent is the dipentaerythritol diphosphites.
Completion fluid of the present invention or workover fluid form the soft particle of millimeter level after absorbing clear water or salt solution by water-absorbing resin, its Size Distribution is at 0.5～3mm, yielding, certain intensity is arranged, described soft particle is being lower than 100 ℃, the physics dehydration can take place under the positive differential pressure operation, and in the borehole wall or eyelet, form the second best in quality artificial borehole wall (or being the physics temporarily blocking layer), prevent the further leakage of completion fluid under the High Pressure Difference or workover fluid, if the well temperature is higher than 120 ℃, or this completion fluid or workover fluid used as perforating fluid, under high temperature and positive differential pressure effect, chemical change can take place in soft granuloplastic artificial borehole wall, form the artificial borehole wall (or being chemical temporarily blocking layer) of colloid, colloid artificial borehole wall bearing capacity is higher, and permeability is lower, prevents that the ability of missing is stronger.
Completion fluid of the present invention or workover fluid, its solution apparent viscosity is adjustable between 25～110mPas, and equipment gone into by main base area face-pumping and tubing string is adjusted water-absorbing resin concentration along the loss of journey frictional resistance, makes it to have the good performance that pumps into.
The present invention regulates above-mentioned completion fluid or workover fluid density by adding monovalent salt NaCl or KCl, and described density determines that according to formation pressure gradient and reservoir temperature specifically reference temperature(TR) influences plate to NaCl or KCl brine density.For the general requirements of gas well kill-job, head of liquid should be higher by 10～20% than strata pressure in the well, the unusual stratum of high pressure capping, the desirable lower limit in normal pressure stratum.
In implementing specific embodiment of the present invention, producing well carries out clean-out service routinely earlier, pipe cleaning on earth after, big discharge capacity is with filtered brine or seawater flushing, replace then into cleaning fluid and glue, clean with filtered brine or seawater again, need satisfy well head returning fluid turbidity (NTU) value less than 30 for gas well.After the pipe cleaning well-flushing is finished, replace earlier, and then replace into the water-absorbing resin completion fluid of design quantity in advance or workover fluid to purpose well section into the conventional completion brine or the workover fluid that prepare.Gush as perforation is counter after the end of job, anti-circulation time is with conventional completion brine system, and is suitable up to density of liquid of returning out and Access-Point Density, and leakage is observed in termination of pumping, if leakoff rate is less than 1m
3/ hr continues next link.In one week of direct circulation, short removing reach the regulation requirement for need well head returning fluid's turbidity (NTU) value in the gas well direct circulation, and calculate on the gas and return the time, if the time reaches requirement, kill job finishes.The pipe cleaning well-flushing is to the shaft bottom once more, replaces out the water-absorbing resin completion fluid or the workover fluid of oil-gas Layer section in the well with conventional completion brine system.Just in case wastage is excessive, can prepares the system of water-absorbing resin completion fluid composite calcium carbonate and carry out leak stopping.
This water-absorbing resin completion fluid or workover fluid can break glue fully with acid solution, and can be reduced into clear water.
The artificial borehole wall that this water-absorbing resin completion fluid or workover fluid form does not need broken glue, only needs to set up Negative Pressure Difference in well after completion or well workover are finished, and just can get rid of this artificial borehole wall in case gas stream enters in the well, recovery oil gas well capacity.
Use the present invention can be in two kinds of situation: a kind of be that full pit shaft uses, and determines consumption by hole volume; Second kind is only to use at the oil gas interval, promptly adopt water-absorbing resin completion fluid or workover fluid in the reservoir section, adopt conventional completion fluid or workover fluid in non-reservoir section, its consumption can be determined consumption by the hole volume of oil gas interval hole volume and additional 200～300 meters, and adopt and do not break the glue construction technology, can effectively reduce operating cost, simplify construction technology.
In the present invention, the removing technology of the broken glue of completion fluid or workover fluid is as follows:
(1) after completion or workover treatment are finished, be lowered to the pipe cleaning tubing string, pipe cleaning is to oil (gas) layer bottom;
(2) pit shaft replaces into conventional completion brine or workover fluid, and water-absorbing resin completion fluid or workover fluid in the well are replaced out well;
(3) note to observe the leakage of completion fluid or workover fluid, and the filling liquid when having noted lower tubular column, prevent blowout, as a large amount of leakages take place, can replace into a spot of water-absorbing resin completion fluid or workover fluid at oily (gas) layer position;
(4) be lowered to flow string;
(5) take out oil well alive by normal procedure tubing flow displacement or pump.
Compared with prior art, the present invention has following beneficial effect:
(1) water-absorbing resin has the high-hydroscopicity energy, and with completion fluid or workover fluid that itself and clear water or salt solution are made into, viscosity can be adjusted between 25～110mPas, and mobile performance is good, can satisfy the requirement of all kinds of operations;
(2) this completion fluid or workover fluid are in well under the positive differential pressure condition, under the high temperature of reservoir temperature or construction operation generation, in the borehole wall or eyelet, form the second best in quality artificial borehole wall through physics and chemical action, prevent the further leakage of completion fluid under the High Pressure Difference or workover fluid, and temperature is high more, gelatinous layer makes that eyelet wall permeability is lower, prevents that the ability of missing is stronger;
(3) this artificial borehole wall does not need brokenly glue, only needs to set up Negative Pressure Difference in well after completion or well workover end, just can get rid of this artificial borehole wall in case gas stream enters in the well, recovers the oil gas well capacity;
(4) this artificial borehole wall material therefor is biological, can degrade environmentally safe under field conditions (factors);
(5) completion fluid or the workover fluid of this water-absorbing resin structure are with low cost, and price has only 1/4th of foam system, and implement conveniently not need special installation and technology;
(6) the present invention can use in all kinds of oil gas wells; comprise the simultaneous various complex hydrocarbon well of permeability, fracture-type reservoir, high pressure zone and low pressure layer; can realize nothing (or low) lost circulation and the safety work of oil gas well, farthest protect the oil gas well capacity simultaneously.
The specific embodiment:
Further specify the present invention according to embodiment below.
Embodiment 1: the completion of certain offshore gas field X7 well and completion construction again
Basic geologic data is as follows:
(1) formation pressure data
This gas field M group gas reservoir is normal pressure system, pressure coefficient 1.03, and prediction bores that M3c, the M4a gas-bearing formation of meeting are respectively 25.37,25.68MPa.The M5a, the M5b that bore chance are for producing gas reservoir, gas reservoir original formation pressure 28.53MPa, on the May 7th, 2007 of pressure measurement for the first time strata pressure 24.4MPa, December in 2007 pressure measurement strata pressure on the 21st 22.49MPa, if be drilled into M5 in mid-April, 2008, predictably stressor layer will be reduced near the 21.6MPa, and reservoir pressure coefficient is about 0.77, will face the leakage problem when piercing this gas-bearing formation.
(2) gas reservoir temperature
This gas-bearing formation geothermal gradient is 0.0356 ℃/m, and reservoir section temperature prediction is about 120 ℃.This gas field X7 gas well gas layer temperature and pressure prediction data is as shown in the table:
(3) estimate the perforation thickness and the degree of depth
X7 well substratum prediction data and imagination perforated zone data are as shown in the table:
Specific implementation method is as follows:
1. clean-out service
After the clean-out service producing well operation routinely, pipe cleaning on earth, big discharge capacity seawater flushing replaces then into cleaning fluid and glue, again with the filtering sea cleaning, until the NTU value less than 30.
2. completion fluid design
(1) design principles
The infull pit shaft of this well uses the water-absorbing resin completion fluid.If normal pressure layer and low pressure layer are opened together, just must increase the weight of seawater or fresh water with NaCl, as the base fluid of conventional completion fluid and water-absorbing resin completion fluid system, can guarantee the safety of kill job.Conventional completion fluid must filter after adding NaCl, could add other additive.The base fluid of preparation water-absorbing resin completion fluid system is a NaCl salt solution of pushing well density design preparation, add NaCl on request after, could press designing requirement adding absorption resin after must filtering.
(2) completion fluid density design
X7 well perforated interval M5 layer well temperature is 118 ℃, and the density of completion fluid system can raise with temperature and reduce.For guaranteeing the once success of X7 gas well kill-job, when preparing well killing fluid density, should consider Temperature Influence on definite ground.Because the influence of temperature on density is linear basically, therefore 1/2 pairing temperature of desirable M5 layer perforation depth is determined ground preparation density.
1/2 pairing temperature of M5 perforated zone well depth:
T＝0.0356×2890/2+17.547＝68.99℃
Determining of completion fluid equal yield density:
According to the general requirements of gas well kill-job, head of liquid should be higher by 10～20% than strata pressure in the well.The unusual stratum of high pressure capping, the desirable lower limit in normal pressure stratum.This well formation pressure gradient is 1.03MPa/100m, belongs to the normal pressure stratum, and desirable lower limit is considered the protection of gas-bearing formation simultaneously, under the prerequisite that guarantees safety work, also can further reduce this value.Comprehensive above-mentioned this well of consideration uses equal yield density to be 1.11g/cm
3NaCl clear brine system.
Head of liquid to the M5 layer when calculating kill-job by this is 32.08MPa, exceeds M5 strata pressure 11MPa, and the water-absorbing resin completion fluid system can guarantee under this pressure reduction, and a large amount of leakages of completion fluid can not take place at the M5 layer.The leak-off of kill job process mesolow layer well killing fluid can be reduced like this, the safe kill-job of normal pressure layer can be guaranteed again.Help guaranteeing the production capacity requirement of going into operation from now on.
Head of liquid to the M4a layer when calculating kill-job by this is 28.78MPa.Exceed M4a layer strata pressure 3.1MPa, added value 12% can satisfy the requirement of kill-job, can control a large amount of leakages of completion fluid on the normal pressure stratum simultaneously, and the induced flow that also is beneficial to is from now on gone into operation.
Determining of ground preparation density:
Brine density in the time of can from the temperature effect chart board, finding the ground preparation according to said temperature and density data.The equal yield density of the density of according to said method finding in well is 1.11g/cm
3Specific practice is as follows: at first find the point of 68.99 ℃ of 1/2 corresponding temperatures of M5 perforated zone middle part well depth on the temperature coordinate, meet at density 1.11g/cm then vertically upward
3, parallelly with adjacent two oblique lines more upwards meeting at the point that temperature is 30 ℃ of surface temperatures, final level is found the well killing fluid density 1.14g/cm of ground preparation
3
(3) completion fluid consumption design
According to designing requirement, the infull pit shaft of water-absorbing resin completion fluid system uses, and just replaces into perforated interval additional again 200～300 meters hole volumes behind the pipe cleaning well-flushing, add more than 700 meter of perforated interval, can consider the consumption of water-absorbing resin completion fluid system by 1000 meters hole volume.Need 20m when using as perforating fluid by this calculating water-absorbing resin completion fluid system
3About.After the kill-job, once more the pipe cleaning well-flushing on earth after, also to replace leakage when preventing following flow string once more at perforated interval into the water-absorbing resin completion fluid system, therefore also need replace into 20m
3About the water-absorbing resin completion fluid system, so the water-absorbing resin completion fluid system amounts to the about 40m of consumption
3About.
Concrete prescription is as follows:
The colloid protective agent of suction initator+0.5 weight % of the water-absorbing resin of fresh water+1 weight %+0.5 weight %
3. construction technology
1) behind the pipe cleaning, with seawater wash cycles pit shaft, replaces then earlier, clean pit shaft with seawater again, be worth less than 30 up to returning fluid's turbidity (NTU) into flushing fluid;
2) with the salt solution preparation water-absorbing resin completion fluid system after filtering;
3) after the pipe cleaning well-flushing is finished, replace earlier into preparing conventional NaCl completion fluid system, and then replace water-absorbing resin completion fluid system into 1000 meters pit shafts to perforated interval;
4) perforation is counter gush after, anti-circulation time is with conventional NaCl completion fluid system, and is suitable up to the density of liquid of returning out and Access-Point Density, termination of pumping is observed and is missed, if leakoff rate is less than 5m
3, continue next link;
5) one week of direct circulation, short removing;
6) direct circulation reaches the regulation requirement up to the gas measured value, and calculates on the gas and return the time.If the time reaches requirement, kill job finishes;
7) the pipe cleaning well-flushing replaces into 1000 meters hole volume water-absorbing resin completion fluid systems to perforated interval to the shaft bottom once more;
8) pull out of hole following flow string;
4. absorb the resin completion fluid system and remove technology
By boring the well completion design requirement, the water-absorbing resin completion fluid system in the well must be removed, in order to avoid subsequent job is impacted.The method that adopts is to extend flow string to the perforated interval bottom, and tubing string to be produced behind the perforated interval bottom, recycles the water-absorbing resin completion fluid system in the well with conventional completion brine down, plays extremely seat envelope position seat envelope of flow string then, carries out the induced flow operation again.
5. effect
Partly adopt the water-absorbing resin completion fluid system as perforating fluid at perforated interval, behind perforation, the shutoff that the artificial borehole wall that forms under the high temperature and high pressure effect (temporarily blocking layer) is good the low porosity and low permeability reservoir, in the completion of X7 well and completion practice once more afterwards, all do not miss, do not cause the leakage of reservoir section with conventional completion fluid circulation kill-job yet.
After gaslift induced flow is gone into operation, according to the X7 well creation data in September, 2008, with 8 millimeters oil nozzle productions, oil pressure 6.53MPa, daily gas 7.48 ten thousand sides, day produce oil 2.67 sides have reached the geological design requirement of this well.
The completion practice of embodiment 2X1 well
The completion practice of this gas field X1 well is substantially constructed according to the design of the water-absorbing resin completion fluid system of X7 well, and operation procedure with reference to the operation procedure of X7, is not missed between operational period yet yet.
After gaslift induced flow is gone into operation, according to the X1 well creation data in November, 2008, with 6.35 millimeters oil nozzle productions, oil pressure 19.73MPa, daily gas 9.3 ten thousand sides, day produce oil 3.56 sides have reached the geological design requirement of this well.
Claims (4)
1. utilize the new method of water-absorbing resin, comprise following steps successively at oil gas well formation artificial borehole wall:
(1) preparation water-absorbing resin completion fluid or workover fluid, this completion fluid or workover fluid comprise component and consumption is as follows:
Water-absorbing resin 1～2 weight %,
Suction initator 0.2～0.5 weight %,
Colloid protective agent 0.2～0.5 weight %,
All the other components are water or monovalence salt solution;
(2) pipe cleaning well-flushing replaces earlier into conventional completion brine or workover fluid, and then replaces into water-absorbing resin completion fluid or workover fluid to purpose well section;
(3) carry out perforation or other operations at the oil gas interval;
(4) pipe cleaning well-flushing after the end of job replaces out the water-absorbing resin completion fluid or the workover fluid of oil-gas Layer section in the well with conventional completion brine or workover fluid.
2. the method for claim 1, it is characterized in that, described water-absorbing resin is the starch based water-absorbing resin, cellulose family water-absorbing resin or synthetic water-absorbing resin, described starch based water-absorbing resin is starch and acrylonitrile graft copolymer, modified starch and acrylonitrile graft copolymer or starch and acrylates graft copolymer, described cellulose family water-absorbing resin is cellulose-acrylates graft polymers, cellulose and acrylamide graft polymer or cellulose and acrylonitrile grafting polymer, described synthetic water-absorbing resin is the homopolymers water-absorbing resin, copolymer water-absorbing resin or inorganic matter composite water absorbing resin; Described suction initator is a triethanolamine; Described colloid protective agent is the dipentaerythritol diphosphites.
3. method as claimed in claim 2, it is characterized in that, homopolymers water-absorbing resin in the described synthetic water-absorbing resin is polyacrylate, polyacrylamide or polyvinyl alcohol, described copolymer water-absorbing resin is acrylic acid-acrylamide copolymer, acrylate-vinyl acetate alcohol copolymerization hydrolysate or AA-E alcohol copolymer, and described inorganic matter composite water absorbing resin is Sodium Polyacrylate-kaolin compound resin, polyacrylic acid potassium-swell soil compound resin or the compound montmorillonite resin of acrylamide and acrylic acid copolymer.
4. the method for claim 1 is characterized in that, the density of water-absorbing resin completion fluid or workover fluid described in the step (1) is regulated by adding monovalent salt NaCl or KCl, and desired density is determined according to formation pressure gradient and reservoir temperature.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102775969A (en) * | 2012-07-23 | 2012-11-14 | 北京中科日升科技有限公司 | Multifunctional filtrate reducer and preparation method thereof |
| CN104653137A (en) * | 2013-11-15 | 2015-05-27 | 中国石油天然气股份有限公司 | Shaping repair technological method of casing deformation well |
| CN107586539A (en) * | 2017-10-30 | 2018-01-16 | 中国石油集团渤海钻探工程有限公司 | Variable density thickens proppant and preparation method thereof certainly |
| CN108623211A (en) * | 2017-03-22 | 2018-10-09 | 交通运输部公路科学研究所 | A kind of dedicated complex viscosity conditioning agent, conditioning agent preparation method and application method |
| CN109575893A (en) * | 2017-09-28 | 2019-04-05 | 中国石油化工股份有限公司 | Carbonate Acid Fracturing is turned to temporarily stifled fluid |
| CN110305644A (en) * | 2019-07-02 | 2019-10-08 | 西南石油大学 | A kind of drop misses the preparation and its application of flexible micelle flushing fluid |
| CN108952622B (en) * | 2018-07-09 | 2020-07-10 | 北京泰利新能源科技发展有限公司 | Quick leaking stoppage and collapse prevention process for drilling in downhole of geothermal well |
| CN111662692A (en) * | 2020-06-04 | 2020-09-15 | 中海油田服务股份有限公司 | Drilling fluid |
| CN112552885A (en) * | 2020-12-20 | 2021-03-26 | 西南石油大学 | Superhigh temperature resistant 180 ℃ tackifying type well completion fluid and workover fluid |
| CN112552891A (en) * | 2020-12-17 | 2021-03-26 | 西南石油大学 | High-density brine jelly plugging agent and preparation method thereof |
| CN112552886A (en) * | 2020-12-20 | 2021-03-26 | 西南石油大学 | Superhigh temperature resistant 180 ℃ variable density solid-free tackifying type well completion fluid and workover fluid |
| CN113999659A (en) * | 2020-07-27 | 2022-02-01 | 中国石油化工股份有限公司 | Temporary plugging type reservoir protection agent and preparation method and application thereof |
| CN115263224A (en) * | 2022-08-15 | 2022-11-01 | 太原理工大学 | Safety device for preventing spraying hole during mining drilling |
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Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102775969A (en) * | 2012-07-23 | 2012-11-14 | 北京中科日升科技有限公司 | Multifunctional filtrate reducer and preparation method thereof |
| CN104653137A (en) * | 2013-11-15 | 2015-05-27 | 中国石油天然气股份有限公司 | Shaping repair technological method of casing deformation well |
| CN108623211A (en) * | 2017-03-22 | 2018-10-09 | 交通运输部公路科学研究所 | A kind of dedicated complex viscosity conditioning agent, conditioning agent preparation method and application method |
| CN109575893B (en) * | 2017-09-28 | 2021-04-23 | 中国石油化工股份有限公司 | Temporary plugging fluid for carbonate rock acid fracturing steering |
| CN109575893A (en) * | 2017-09-28 | 2019-04-05 | 中国石油化工股份有限公司 | Carbonate Acid Fracturing is turned to temporarily stifled fluid |
| CN107586539A (en) * | 2017-10-30 | 2018-01-16 | 中国石油集团渤海钻探工程有限公司 | Variable density thickens proppant and preparation method thereof certainly |
| CN108952622B (en) * | 2018-07-09 | 2020-07-10 | 北京泰利新能源科技发展有限公司 | Quick leaking stoppage and collapse prevention process for drilling in downhole of geothermal well |
| CN110305644A (en) * | 2019-07-02 | 2019-10-08 | 西南石油大学 | A kind of drop misses the preparation and its application of flexible micelle flushing fluid |
| CN110305644B (en) * | 2019-07-02 | 2021-12-21 | 西南石油大学 | Preparation and application of leakage-reducing flexible colloidal particle well-flushing fluid |
| CN111662692B (en) * | 2020-06-04 | 2022-12-09 | 中海油田服务股份有限公司 | Drilling fluid |
| CN111662692A (en) * | 2020-06-04 | 2020-09-15 | 中海油田服务股份有限公司 | Drilling fluid |
| CN113999659A (en) * | 2020-07-27 | 2022-02-01 | 中国石油化工股份有限公司 | Temporary plugging type reservoir protection agent and preparation method and application thereof |
| CN113999659B (en) * | 2020-07-27 | 2023-08-08 | 中国石油化工股份有限公司 | Temporary plugging type reservoir protecting agent and preparation method and application thereof |
| CN112552891A (en) * | 2020-12-17 | 2021-03-26 | 西南石油大学 | High-density brine jelly plugging agent and preparation method thereof |
| CN112552886A (en) * | 2020-12-20 | 2021-03-26 | 西南石油大学 | Superhigh temperature resistant 180 ℃ variable density solid-free tackifying type well completion fluid and workover fluid |
| CN112552885A (en) * | 2020-12-20 | 2021-03-26 | 西南石油大学 | Superhigh temperature resistant 180 ℃ tackifying type well completion fluid and workover fluid |
| CN112552886B (en) * | 2020-12-20 | 2023-03-10 | 西南石油大学 | Superhigh temperature resistant 180 ℃ variable density solid-free tackifying type well completion fluid and workover fluid |
| CN112552886B9 (en) * | 2020-12-20 | 2023-05-26 | 西南石油大学 | Ultrahigh-temperature-resistant 180 ℃ variable-density solid-free tackifying completion fluid and workover fluid |
| CN115263224A (en) * | 2022-08-15 | 2022-11-01 | 太原理工大学 | Safety device for preventing spraying hole during mining drilling |
| CN115263224B (en) * | 2022-08-15 | 2023-07-25 | 太原理工大学 | Mining safety device that prevents orifice that drills |
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