The content of the invention
Based on above mentioned problem, it is an object of the invention to provide a kind of Oil/gas Well packing particle and its manufacture method, the oil gasThe packing effect of well packing particle is preferable, and manufacturing cost is relatively low.
According to the first aspect of the invention, there is provided a kind of Oil/gas Well insulates particle, and the Oil/gas Well packing particle is grainFootpath is 0.07~0.80mm, density is 0.90~1.25g/cm3Polyethylene particle.
Preferably, the density of the polyethylene particle is 1.00g/cm3。
Preferably, the polyethylene particle be shaped as it is spherical.
Oil/gas Well packing particle according to the first aspect of the invention, compared to vitreous hollow of the prior artFor grain, it is easier to manufacture and cost is lower.In addition, when Oil/gas Well insulates particle with insulating filling for particle for carrying Oil/gas WellWhen filling out liquid has roughly the same density, Oil/gas Well packing particle can suspend naturally in packing fluid so that Oil/gas Well insulatesParticle is easier as packing fluid flows.Consider the factors such as reservoir pressure coefficient, the density of the packing fluid of use is generally 0.90~1.25g/cm3, therefore the density of Oil/gas Well packing particle is also configured as 0.90~1.25g/cm3.In the prior art, polyethyleneThe density of particle is generally 0.70~1.5g/cm3, particle diameter is generally selected in the range of 0.05~1.0mm.Applicant is by a large amount ofExperiment learn, when the density of polyethylene particle is 0.90~1.25g/cm3, and particle diameter is in 0.07~0.80mm scope,Both will not because of Oil/gas Well insulate particle particle diameter it is excessive and influence packing effect, again will not because of Oil/gas Well insulate particle grainFootpath is too small and it is increased the cost in actual production.Therefore, Oil/gas Well of the invention packing particle is playing preferable packingWhile effect, and manufacturing cost is reduced to greatest extent.
In addition, the manufacturing of the Oil/gas Well packing particle of the present invention is simple and convenient, and it is safe and reliable, it is easy to widelyPopularization and application.
According to the second aspect of the invention, there is provided a kind of manufacture method of Oil/gas Well packing particle, it includes following stepSuddenly：
Step 1, using gaseous ethene as primary raw material, adjusted under assigned temperature and specified pressure by initiator and densityWhole dose of progress polymerisation, makes the ethene form vinyl polymer molten polymer in reaction zone；
Step 2, separated in the mixture by the vinyl polymer molten polymer from the raw material of polymerisation with productOut；
Step 3, the vinyl polymer molten polymer feeding comminutor obtained will be separated, to form average grain diameter as 0.07~0.80mm, density are 0.90~1.25g/cm3Polyethylene particle.
Preferably, the step 2 includes：
Step 2.1, the raw material of polymerisation is separated with the mixture of product in first that operating pressure is 25~30MpaFirst time separation is carried out in machine, to cause the unreacted ethene to be separated with the vinyl polymer molten polymer；
Step 2.2, will be mixed containing the ethene and the vinyl polymer molten polymer after first time separatesCompound carries out second in the second separator that operating pressure is 0.3~0.4Mpa and separated, with cause the ethene with it is describedVinyl polymer molten polymer further separates.
Preferably, in the step 2.1, the ethene being separated after separating for the first time is sent back to the reactionArea's raw material as the polymerisation again；In the step 2.2, the ethene being separated after second of separation is firstIt is sent back to raw material of the reaction zone again as polymerisation again after supercharging.
Preferably, before the step 2.1 is carried out, first the mixture of the raw material of the polymerisation and product is carried outDecompression and cooling so that the pressure of the raw material of the polymerisation and the mixture of product is reduced to 46~54Mpa, and temperature reducesTo 242~258 DEG C.
Preferably, in the step 1, the initiator is oxygen, dicyclohexyl peroxidating carbonic acid hydrogen ester, tert-butyl group mistakeDecylate, two caprinoyls, di-tert-butyl peroxide or TBHP；The density adjusting agents are propylene, propane or fourthAlkene.
Preferably, the assigned temperature is 150~300 DEG C, and the specified pressure is 150~300Mpa.
The manufacture method of Oil/gas Well packing particle according to the second aspect of the invention manufactures first aspect present inventionOil/gas Well insulates particle, and the packing effect of the Oil/gas Well packing particle of manufacture is preferable, and manufacturing cost is relatively low, can improveThe cost of oil-gas mining is reduced while the oil and gas production of Oil/gas Well.
Embodiment
The embodiment of technical solution of the present invention is described in detail below in conjunction with accompanying drawing.Following examples are only used forClearly illustrate technical scheme, therefore be only used as example, and the protection model of the present invention can not be limited with thisEnclose.
Particle is insulated the invention provides a kind of Oil/gas Well, Oil/gas Well packing particle is average grain diameter for 0.07~0.80mm, density are 0.90~1.25g/cm3Polyethylene particle.So-called Oil/gas Well refers to the oil of broad sense in oil-gas field developmentGas well, including oil well, gas well, injection well etc..
Oil/gas Well packing particle according to the first aspect of the invention, compared to vitreous hollow of the prior artFor grain, it is easier to manufacture and cost is lower.In addition, when Oil/gas Well insulates particle with insulating filling for particle for carrying Oil/gas WellWhen filling out liquid has roughly the same density, Oil/gas Well packing particle can suspend naturally in packing fluid so that Oil/gas Well insulatesParticle is easier as packing fluid flows.Consider the factors such as reservoir pressure coefficient, the density of the packing fluid of use is generally 0.90~1.25g/cm3, therefore the density of Oil/gas Well packing particle is also configured as 0.90~1.25g/cm3.In the prior art, polyethyleneThe density of particle is generally 0.70~1.5g/cm3, particle diameter is generally selected in the range of 0.05~1.0mm.Applicant is by a large amount ofExperiment learn, when the density of polyethylene particle is 0.90~1.25g/cm3, and particle diameter is in 0.07~0.80mm scope,Both will not because of Oil/gas Well insulate particle particle diameter it is excessive and influence packing effect, again will not because of Oil/gas Well insulate particle grainFootpath is too small and it is increased the cost in actual production.Therefore, Oil/gas Well of the invention packing particle is playing preferable packingWhile effect, and manufacturing cost is reduced to greatest extent.
Fig. 1 is the schematic diagram according to the Oil/gas Well packing particle packing Oil/gas Well of the present invention.As shown in figure 1, using above-mentionedOil/gas Well packing particle is as follows to insulate the operating method of Oil/gas Well：First, stream water-control sieve tube tubing string 2 will be adjusted to deliver to oil well horizontalSection, annular space is formed between the borehole wall 1 and tune stream water-control sieve tube tubing string 2；Then, base sealed packer 4 and open fill device 5, will takePacking fluid with Oil/gas Well packing particle carries out direct circulation so that Oil/gas Well packing particle is admitted to annular space and stratum；Finally,When annular space progressively by grain packing consolidation after, above carry device for filling 5.In addition, so-called direct circulation refers to carry Oil/gas Well envelopeDevice for filling 5 is transported to from oil pipe every the packing fluid of particle, then is transported to annular space.
In addition, when oil well needs to carry out to repair the row's of returning operation of operation on follow-up, its concrete operation method is as follows：First,Deblocking packer 4, return row for Oil/gas Well packing particle and form passage；Then, direct circulation is carried out using workover fluid so that in annular spaceFill closely knit Oil/gas Well packing particle to be progressively loosened, be finally taken to ground with workover fluid.Equally, it is so-called when the row of returning operatesDirect circulation also refer to workover fluid and be transported to device for filling 5 from oil pipe, then be transported to annular space..
The Oil/gas Well packing particle of the present invention is used as carrier by instruments such as packer, device for filling, and by the use of packing fluidThe annular space for needing to insulate or stratum etc. are entered in Oil/gas Well.In stowing operation, a part of Oil/gas Well packing particle is with fillingFill out liquid and enter stratum, another part Oil/gas Well insulates particle by adjusting the stop for flowing water-control sieve tube to be left on annular space, with fillingThe continuous progress of work, annular space progressively will insulate grain packing consolidation by Oil/gas Well.Even if found in follow-up production processFlow channel is still had in annular space, Oil/gas Well packing particle can also block up with the further movement of fluid in Oil/gas WellFlow channel is filled in, realizes effective packing of annular space.After the grain packing of Oil/gas Well packer is in horizontal segment, fluid is by the borehole wall to tuneFlow water-control sieve tube tubing string distance is short, contact area is big, therefore ensure that fluid along the unimpeded of Oil/gas Well longitudinal flow；And fluidAlong the flow distance of transverse direction is long, annular space cross-sectional area is small, fluid lateral flow resistance is big, make fluid transverse direction flowing bySuppress.Therefore, Oil/gas Well packing particle can play a part of effectively insulating, and improving conventional packer segmentation series hasThe problem of limit, packing less effective, so as to improve the oil and gas production of Oil/gas Well.
For economical reasons, it is water that packing fluid, which is typically selected, therefore the density of polyethylene particle is preferably 1.00g/cm3Left and right, such design cause Oil/gas Well packing particle has generally to adapt to, can be applied to most Oil/gas Well.SeparatelyOutside, polyethylene particle is preferably spherical so that Oil/gas Well packing particle well-balanced property is good, sorting is good, and more holdEasily as packing fluid flows.In addition, the gap between each Oil/gas Well packing particle is smaller, the effect of packing is also more preferable.
Fig. 2 is the flow chart for the manufacture method that particle is insulated according to the Oil/gas Well of the present invention.As shown in Fig. 2 the manufacturerMethod comprises the following steps：
Step 1, using gaseous ethene as primary raw material, adjusted under assigned temperature and specified pressure by initiator and densityWhole dose of progress polymerisation, makes ethene form vinyl polymer molten polymer in reaction zone；
Step 2, vinyl polymer molten polymer is separated from the mixture of the raw material of polymerisation and product；
Step 3, the vinyl polymer molten polymer feeding comminutor obtained will be separated, to form average grain diameter as 0.07~0.80mm, density are 0.90~1.25g/cm3Polyethylene particle.
Above-mentioned assigned temperature is 150~300 DEG C, and specified pressure is 150~300Mpa.
Oil/gas Well packing particle, the oil gas at manufacture are manufactured according to the manufacture method of the Oil/gas Well of present invention packing particleThe packing effect of well packing particle is preferable, and manufacturing cost is relatively low, can be reduced while the oil and gas production of Oil/gas Well is improvedThe cost of oil-gas mining.In addition, the manufacture method of the Oil/gas Well packing particle of the present invention, by the agent for changing density adjusting agentsAmount, it becomes possible to the density of Oil/gas Well packing particle is adjusted, and by changing the setting of the granulation diameter to comminutor, it becomes possible to adjustSave particle diameter.Therefore the Oil/gas Well packing particle of different densities and particle diameter can be produced as needed, can be employedIn the Oil/gas Well of different operating modes.
In the present embodiment, step 2 also includes：
Step 2.1, the raw material of polymerisation is separated with the mixture of product in first that operating pressure is 25~30MpaFirst time separation is carried out in machine, to cause unreacted ethene to be separated with vinyl polymer molten polymer；
Step 2.2, by the mixture containing ethene and vinyl polymer molten polymer after first time separates in workMake to carry out second of separation in the second separator that pressure is 0.3~0.4Mpa, make it that it is poly- that ethene and vinyl polymer meltCompound further separates.
Because ethene can not be fully converted into vinyl polymer molten polymer in polymerisation, therefore in polymerisationProduct in be mixed with a large amount of ethene, so needing to be separated ethene with vinyl polymer molten polymer.In addition, firstThe operating pressure of secondary separation is higher than the operating pressure of second of separation, and its purpose is to further by unreacted ethene and itsIn contained impurity separated, especially preferably wax residue contained in ethene can be separated.
In step 2.1, the ethene that is separated is sent back to reaction zone and is used as polymerisation again after separating for the first timeRaw material, in step 2.2, second separate after the ethene that is separated first pass through after supercharger is pressurized and be sent back to againThe reaction zone raw material as polymerisation again.
The conversion ratio of ethene is not high in the polymerization, be mixed to ethene in vinyl polymer molten polymer compared withIt is more, it is therefore desirable to unreacted ethylene gas is re-fed into reactor after separation and reacted, to avoid the wave of etheneTake, reduce production cost.Further, since the pressure for carrying out polymerisation in the reaction region is higher, and after second separatesThe pressure for the ethene isolated is relatively low, in order to avoid the ethene of low pressure is sent directly into reaction zone, first using supercharger to secondThe ethene isolated after secondary separation is pressurizeed, it is possible to increase the efficiency of polymerisation in reaction zone.
Pulse valve and cooler are installed in the exit of reaction zone, before step 2.1 is carried out, first by polymerisationThe mixture of raw material and product is depressured by pulse valve, its pressure is reduced to 46~54Mpa, and enter by coolerRow cooling, makes its temperature be reduced to 242~258 DEG C.Because the temperature and pressure that polymerisation is carried out in reaction zone is all higher, firstThe mixture of the raw material of polymerisation and product is depressured and cooler and separated again after being cooled by the way that pulse valve is good,The safe operation of the first separator can be ensured, while can also improve separative efficiency.
In step 3,5.0Mpa or so is pressurized into the vinyl polymer molten polymer after comminutor, first passes through and changeWire stitcher so that the impurity in vinyl polymer molten polymer is further filtered.Hereafter, vinyl polymer molten polymer existsEnter multiple passages that diameter tapers into comminutor after shunting, and accelerate flowing in passage, finally from comminutorDischarge end flows out, by the pelletizing hydroecium for entering comminutor after the nib on discharge end with wire.Vinyl polymer melt polymerizationAfter the water cooling that thing is 50~70 DEG C by temperature in pelletizing hydroecium, it is the poly- of 0.07~0.80mm to be cut into particle diameter by revolution cutting knifeEthene particle.Wherein, polyethylene particle specific particle size as needed can be by changing the granulation diameter of comminutorSet to be adjusted.
In the present embodiment, it is oxygen or organic peroxide that the initiator used in step 1, which can be selected, organic mistakeOxide such as dicyclohexyl peroxidating carbonic acid hydrogen ester, the tert-butyl group cross decylate, two caprinoyls, di-tert-butyl peroxide or the tert-butyl groupHydrogen peroxide etc. can be used as initiator.According to the needs of polymerisation, initiator can also be several organic peroxidesThe mixture either mixture of air and organic peroxide, mainly consider whether to carry when initiator in selectionThe efficiency of high polymerisation and the factor such as whether it is easily obtained.In addition, density adjusting agents can be selected as propylene, propane or fourthAlkene.
In this application, term " first ", " second " etc. are only used for describing purpose, and it is not intended that instruction or hint phaseTo importance or the implicit quantity for indicating indicated technical characteristic.In the description of the invention, " multiple " are meant that twoMore than individual, unless otherwise specifically defined.
Although by reference to preferred embodiment, invention has been described, is not departing from the situation of the scope of the present inventionUnder, various improvement can be carried out to it and part therein can be replaced with equivalent.Especially, as long as being rushed in the absence of structureProminent, the every technical characteristic being previously mentioned in each embodiment can combine in any way.The invention is not limited in textDisclosed in specific embodiment, but all technical schemes including falling within the scope of the appended claims.