CN104031625A - Blocking remover used for hypotonic inhomogeneous sandstone reservoir and using method of blocking remover - Google Patents
Blocking remover used for hypotonic inhomogeneous sandstone reservoir and using method of blocking remover Download PDFInfo
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- CN104031625A CN104031625A CN201410277446.9A CN201410277446A CN104031625A CN 104031625 A CN104031625 A CN 104031625A CN 201410277446 A CN201410277446 A CN 201410277446A CN 104031625 A CN104031625 A CN 104031625A
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
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Abstract
The invention discloses a blocking remover for hypotonic inhomogeneous sandstone reservoir and a using method of the blocking remover. The blocking remover comprises an agent A, an agent B and an agent C, wherein the agent A consists of the following components in percentage by weight: 10%-25% of oxidant, 8%-12% of activator and the balance of water; the agent B consists of 10%-15% of a reducing agent, 0.3%-1.2% of a foaming agent, 0.3%-0.6% of a foam stabilizer, and the balance of water; the agent C consists of 8%-12% of HCL, 6%-10% of organic acid, 2%-5% of NH4HF2, 0.5%-1.5% of a corrosion inhibitor, 0.5%-1.5% of an iron ion stabilizer and the balance of water. The using method comprises the steps of step one, preparing the agent A, the agent B and the agent C; and step two, injecting the agent A into a ground layer by a pipeline, then injecting the agent B into the ground layer, and finally injecting the agent C into the ground layer. The blocking remover disclosed by the invention has beneficial effects that the blocking remover disclosed by the invention can be applied to decompression and augmented injection of a water injecting well and deep unblocking of an oil well; and the blocking remover has better effect while being applied to augmented injection of the water well in a reservoir non-homogeneous oil-field block.
Description
Technical field
The present invention relates to a kind of unblocking agent and using method, particularly a kind of unblocking agent for hypotonic permeable Heterogeneous Sandstone Reservoirs and using method.
Background technology
At present, in oil extraction in oil field process, particularly for low permeability oil field, prolongation along with the production time, immediate vicinity of wellbore is stopped up and is constantly increased the weight of, resident fluid seepage resistance increases, cause well water injection pressure rising water injection rate to reduce, oil well output significantly declines, for removing, stop up, Acidizing Technology is to keep the main volume increase of oil field high-efficiency mining, well stimulation, the matrix acidifying technology that adopt are carried out de-plugging more at present, for this type of situation, what generally adopt is sandstone matrix acidifying, acidifying mechanism, can be divided into: soil acid acidizing, retarded acid acidifying, foamed acid acidifying and gelled acid acidifying.
The first kind, soil acid acidizing utilizes the silicates mineral such as clay in the hydrofluoric acid dissolution stratum in mud acid, feldspar, reaches the effect that improves near wellbore formation rate of permeation, and this type of technological deficiency is that to improve radius little, easily produces secondary injury, and validity period is short.As injury analysis and the treatment measures > > of < < after sandstone reservoir mud acid is processed, Inner Mongol petrochemical complex, 12 phases in 2005, analyzed sandstone reservoir has been implemented to various injuries and the corresponding treatment measures after acidification technique; The application > > of < < Sandstone Acidizing Technique in 45 oil-field developments of Shanxi, Oil/gas Well test, the 10th the 3rd phase of volume of calendar year 2001, in Shanxi, 45 sandstone oil fields have carried out soil acid acidizing de-plugging, initial stage has been obtained better effects, but validity period is short.
Equations of The Second Kind, retarded acid acidifying mainly adopts the weak acid such as formic acid, acetic acid, boric acid, phosphoric acid to react in stratum with villiaumite and generates hydrofluoric acid, the silicates mineral such as the clay in dissolving stratum, feldspar, reach the effect that improves zone permeability, this type of acidifying major advantage is that steam circle is larger, secondary injury compared with mud acid a little less than, but acid solution mainly enters height and oozes stratum while being applied to nonuniformity stratum, limited to low permeability formation improvement effect, do not reach the object of effective de-plugging.If < < Polyatomic-recombination Acid Depressurization Augmented Injection Technology is at the application > in Wen Nan oil field >, drilling technique, the 24th the 4th phase of volume of calendar year 2001, adopt HCl, phosphoric acid and organic acid corrosion is siliceous, the tamper of shale class, remove formation damage; High efficiency composition oil and water well unblocking agent synthetic method, publication number CN1244566A, by organic acid, organic solvent and tensio-active agent a kind of composite blockage relieving agent that is composited in proportion, can dissolve inorganic and organic obstruction.
The 3rd class, foamed acid acidifying is in conventional acid solution, to add a certain proportion of pore forming material, mix with nitrogen, carbon dioxide gas or Sweet natural gas and high-speed stirring, formation be take acid solution as external phase, bubble is the foam system of disperse phase, this type of acid is applicable to the difficult low pressure oil gas well stimulation of the row of returning, its shortcoming is the machine cost that increases construction that adds due to gas, foam generated size is uneven, in construction process, easily generation gas is stifled causes that operation pressure is too high, and the liquid gas of employing causes cold damage to stratum.As < < turns to acid to carry out the execute-in-place experience > > of acidizing treatment with foam, Oilfields engineering, the 12nd the 5th phase of volume in 2000, for high-water-cut oil-producing well, the preferential foamed acid damping fluid that adopts carries out acidizing treatment, the radius-of-curvature that its infiltrates oil reservoir reaches 2ft when above, has obtained good effect; An acidification to dispel block method, publication number CN101255789A, on conventional acid system basis, has increased a liquid carbon dioxide or nitrogen slug, as energization slug, promotes acid solution to return row; Foam acid de-plugging technology, publication number CN102094614A adds pore forming material and suds-stabilizing agent in conventional acid solution, by frothing machine, mixes with gas, makes system have aerated fluid character and souring ability.
The 4th class, gelled acid acidifying is in conventional acid liquid system, to add a certain amount of acid liquor gellant or polymkeric substance etc., can reduce acid liquid loss speed, reduce the speed of response of acid and formation rock, thereby greatly increase effective penetration range of active acid, its main drawback is that gelled acid returns row's difficulty, easily produces secondary injury.As < < TH become sticky research and the application > > of sour acid fluid system, Henan science, the 22nd the 6th phase of volume in 2000, test in place shows, become sticky acid system construction of employing, fracture length doubles compared with gelled acid system construction, and leakoff coefficent and acid liquid loss amount reduce approximately 50%, and effect of increasing production has improved 2.5 times on gel acid basis.
In sum, there is the problem of following several respects in a few class acidification to dispel block technology in currently available technology:
1, to improve radius little in regular mud acid acidifying, easily produces secondary injury, and validity period is short;
When 2, retarded acid is applied to nonuniformity stratum, acid solution mainly enters height and oozes stratum, limited to low permeability formation improvement effect, does not reach the object of effective de-plugging;
3, foam generated size is uneven during foamed acid acidifying, easily produces that gas is stifled causes that operation pressure is too high in construction process, and the liquid gas of employing causes cold damage to stratum;
4, exist the row's of returning difficulty during gelled acid acidifying, easily produce the problem of secondary injury.
Summary of the invention
The object of the invention is in order to solve in the recovery process of low permeability oil field, the sandstone matrix acidifying technology generally adopting is carried out the problems of de-plugging generation and a kind of unblocking agent for hypotonic permeable Heterogeneous Sandstone Reservoirs and the using method that provide.
Unblocking agent for hypotonic permeable Heterogeneous Sandstone Reservoirs of the present invention includes A agent, B agent and C agent, and A agent, B agent and the moiety of C agent and the weight percent of each component are as follows:
A agent is that water forms by oxygenant 10-25%, activator 8-12%, surplus, and wherein oxygenant is Sodium Nitrite or ammonium nitrite or potassium nitrite; Activator is the mixture of hydrochloric acid or phosphoric acid or hydrochloric acid and phosphoric acid;
B agent is that water forms by reductive agent 10-15%, pore forming material 0.3-1.2%, suds-stabilizing agent 0.3-0.6%, surplus, and wherein reductive agent is urea or sodium carbonate or bicarbonate of ammonia; Pore forming material is trimethyl-glycine or sodium laurylsulfonate or sodium lauryl sulphate; Suds-stabilizing agent is polyacrylamide; The formal name used at school of trimethyl-glycine is dimethyl-β-DMPT;
C agent is by HCL8-12%, organic acid 6-10%, NH
4hF
22-5%, inhibiter 0.5-1.5%, Fe stabilizer 0.5-1.5%, surplus are that water forms, and wherein organic acid is organic phosphoric acid or acetic acid or organic sulfonic acid or citric acid; Inhibiter is cetylamine or SODIUMNITRATE or hydroxy ethylene diphosphonic acid or diethylenetriamine five fork phosphonic acids; Fe stabilizer is edetate or Citrate trianion or diethylenetriamine pentacarboxylic acid salt;
The volume ratio of A agent and B agent is 1:1.8～2.3, and the volume ratio of A agent and C agent is 1:1.9～2.2.
Using method for the unblocking agent of hypotonic permeable Heterogeneous Sandstone Reservoirs is as described below:
The first step: prepare respectively A agent, B agent and C agent in three Agitation Tanks, and make A agent, B agent and C agent uniform mixing under normal temperature, atmospheric pressure state;
Second step: first A agent is injected to stratum by pipeline, beat clear water isolation slug, again B agent is injected to stratum, finally C agent is injected to stratum, the volume ratio of A agent and B agent is 1:1.8～2.3, the volume ratio of A agent and C agent is 1:1.9～2.2, total injection rate of A agent, B agent and C agent is depending on strata condition, and vexed well 8-12 hour after replacing, after in liquid to be mixed, each component is fully reacted, the row of returning that drives a well, then carry out normal water filling or oil recovery.
Reaction principle of the present invention is as follows:
A agent and B agent are mainly by urea (carbonyl diamine CO (NH
2)
2), nitrite, activator and pore forming material and suds-stabilizing agent form, and under formation temperature, can react, its reaction formula is as follows:
After the gas generating after reaction and pore forming material and suds-stabilizing agent effect, form stabilise bubbles of uniform size, effectively shutoff high permeability formation, can realize uniform acid distribution when follow-up C agent is injected, and the heat of generation can be removed organic obstructions such as bituminous matter, colloid.
C agent is mainly comprised of organic retarded acid, villiaumite and additive, drilling mud pollution, the incrustation scale that can remove stratum pollutes, solia particle stops up, improve zone permeability, the calcium ion in organic retarded acid energy complexing stratum of employing, reduces the injury of secondary sedimentation.
It is organically to combine with life foam system and deep acid system from angry heating element that the most important improvement of the present invention is in a layer, there are three kinds of systems separately, be particularly suitable for low-permeable heterogeneous oil reservoir in step-down augmented injection and the well deep part de-plugging of well.
Beneficial effect of the present invention:
1, the present invention can be applied to water injection well step-down augmented injection and well deep part de-plugging, A agent and B agent generate a large amount of gas and heat after reacting in stratum, gas and pore forming material effect generate uniform stabilise bubbles, effective shutoff high permeability formation, when being injected, follow-up acid solution can realize uniform acid distribution, drilling mud pollution, the incrustation scale that can remove stratum pollutes, solia particle stops up, and improves zone permeability, realizes the effective acidifying in deep; The heat generating can be removed organic obstructions such as bituminous matter, colloid; The gas foam foam viscosity generating is large, and carrying capacity is strong, during the row of returning, takes the particulate producing after acidifying and secondary sedimentation out of pit shaft, increases the efficient of acidifying;
When 2, the present invention is applied to have the intensified injection of wells in the block of reservoir heterogeneity oil field, effect is better, and the foam of generation can shutoff high permeability formation, and acid solution is removed the perviousness that low-permeability layer is polluted and effectively improved to ground deep layer, adjusts intake profile, realizes effective water filling;
When 3, the present invention is applied to the low common heavy oil oil well of producing energy, effect is better, A agent and B agent generate a large amount of gas and heat after reacting in stratum, gas can increase producing energy, gas can reduce oil viscosity after being dissolved in crude oil, and the heat of generation can be removed organic obstructions such as gum asphalt.
Accompanying drawing explanation
Fig. 1 is high temperature and high voltage experimental device.
Fig. 2 is basic tubular type physical simulation experiment device.
1, High Temperature High Pressure adiabatic reaction still 2, high pressure nitrogen steel cylinder 3, long core holding unit 4, thermostat container.
Embodiment
Embodiment mono-:
Unblocking agent for hypotonic permeable Heterogeneous Sandstone Reservoirs includes A agent, B agent and a C agent, and A agent, B agent and the moiety of C agent and the weight percent of each component are as follows:
A agent is comprised of Sodium Nitrite 10%, hydrochloric acid 8% and water 82%; B agent is comprised of urea 10%, sodium lauryl sulphate 0.3%, polyacrylamide 0.3% and water 89.4%; C agent is by HCL8%, organic phosphoric acid 6%, NH
4hF
22%, cetylamine 0.5%, edetate 0.5% and water 83% form.
By the volume ratio of A agent, B agent and C agent, be that 1:2:2 is used in conjunction with, total injection rate of A agent, B agent and C agent is depending on strata condition.
Embodiment bis-:
Unblocking agent for hypotonic permeable Heterogeneous Sandstone Reservoirs includes A agent, B agent and a C agent, and A agent, B agent and the moiety of C agent and the weight percent of each component are as follows:
A agent is comprised of Sodium Nitrite 25%, hydrochloric acid 12% and water 63%; B agent is comprised of urea 15%, sodium lauryl sulphate 1.2%, polyacrylamide 0.6% and water 83.2%; C agent is by HCL12%, organic phosphoric acid 10%, NH
4hF
25%, cetylamine 1.5%, edetate 1.5% and water 70% form.
By the volume ratio of A agent, B agent and C agent, be that 1:1.8:2 is used in conjunction with, total injection rate of A agent, B agent and C agent is depending on strata condition.
Embodiment tri-:
Unblocking agent for hypotonic permeable Heterogeneous Sandstone Reservoirs includes A agent, B agent and a C agent, and A agent, B agent and the moiety of C agent and the weight percent of each component are as follows:
A agent is comprised of Sodium Nitrite 18%, hydrochloric acid 10% and water 72%; B agent is comprised of urea 13%, sodium lauryl sulphate 0.8%, polyacrylamide 0.5% and water 85.7%; C agent is by HCL10%, organic phosphoric acid 8%, NH
4hF
24%, cetylamine 1%, edetate 1% and water 76% form.
By the volume ratio of A agent, B agent and C agent, be that 1:2.3:2.2 is used in conjunction with, total injection rate of A agent, B agent and C agent is depending on strata condition.
During on-the-spot use, carry out as follows:
The first step: get each disclosed constituent materials of previous embodiment one or embodiment bis-or embodiment tri-, prepare respectively A agent, B agent and C agent in three Agitation Tanks, and make A agent, B agent and C agent uniform mixing under normal temperature, atmospheric pressure state;
Second step: first A agent is injected to stratum by pipeline, beat clear water isolation slug, again B agent is injected to stratum, finally C agent is injected to stratum, total injection rate of A agent, B agent and C agent is depending on strata condition, and vexed well 8-12 hour after replacing, after in liquid to be mixed, each component is fully reacted, the row of returning that drives a well, then carry out normal water filling or oil recovery.
Experimental evaluation:
Experiment one:
This experiment adopts each component proportion in embodiment mono-, and by A agent and B agent, hybrid reaction in container generates a large amount of gas and heat, as shown in Figure 1.
Experimentation: in High Temperature High Pressure adiabatic reaction still 1, add certain volume and certain density inflating medium solution, setting High Temperature High Pressure adiabatic reaction still 1 temperature is 20 ℃, constant temperature 0.5h, open high pressure nitrogen steel cylinder 2, system pressure is risen to required pressure P 0, record the temperature and pressure changing conditions in temperature-rise period, temperature rises to after design temperature constant temperature two hours to pressure and no longer changes, reaction finishes, pressure release cooling, cleaning High Temperature High Pressure adiabatic reaction still 1, concrete numerical value is as shown in the table:
Experiment two:
This experiment adopts the proportioning in embodiment mono-, divide slug to inject basic tubular type physical simulation experiment device (seeing accompanying drawing 2) A agent and B agent, make its hybrid reaction in long core holding unit 3 generate a large amount of gas, be mixed to form the uniform stabilise bubbles of a large amount of volumes, shutoff high permeability formation with pore forming material.
From experimentation, after injection A agent and B agent are fully reacted, start to inject clear water, the pressure reduction at long core holding unit 3 two ends continues to raise, and exit end produces stable aerated fluid gradually, along with the increase of water flush volume, shutoff takes the lead in reducing rear increase, finally, declining, be tending towards relatively stable, concrete numerical value is as shown in the table:
Experiment three:
This experiment adopts the proportioning in embodiment mono-, divides slug to inject basic tubular type physical simulation experiment device (seeing accompanying drawing 2) A agent, B agent and C agent, is below experimental procedure:
(1) the long rock core of saturated oil and water is placed in to thermostat container 4, by Fig. 2, connects each plant and instrument, thermostat container 4 is put to formation temperature.
(2) carry out water drive, continuous driving replaces to guarantee that model reaches target surplus oil state.Graduated cylinder with several different volumes in oil displacement process is collected liquid effluent, and records discharge liquid measure, time, pressure, the temperature of each time, calculates initial rate of permeation K
o.
(3) stop after water drive, in model, inject chemical agent, pressure is to inject under 10MPa, carries out composite blockage relieving, and under this pressure " closing well ".
(4) when " closing well " time, reach after 3-4 hour, " driving a well " realizes the row of returning, and collects respectively liquid effluent, and record the discharge liquid measure of each time, time used, pressure, and temperature with the graduated cylinder of several different volumes.
(5) again carry out water drive, and record discharge liquid measure, time, pressure, the temperature of each time, calculate and improve rear core permeability K, concrete numerical value is as shown in the table:
From experimental data, after injecting A agent, rate of permeation has improvement to a certain degree, be due to the acid fluid dissolves in A agent the carbonate in rock core, inject the permeability plugging of testing after B agent larger, because A agent and B agent contact rear reaction in rock core, a large amount of foam blocking high permeability formations have been generated, after injecting C agent, rate of permeation increases considerably, illustrate that acid solution carried out good improvement to rock core, after injecting, the final rate of permeation increase rate of base fluid test reaches 6-12 doubly, illustrates that the present invention has good correctional effect to reservoir.
Claims (2)
1. for a unblocking agent for hypotonic permeable Heterogeneous Sandstone Reservoirs, it is characterized in that: include A agent, B agent and C agent, A agent, B agent and the moiety of C agent and the weight percent of each component are as follows:
A agent is that water forms by oxygenant 10-25%, activator 8-12%, surplus, and wherein oxygenant is Sodium Nitrite or ammonium nitrite or potassium nitrite; Activator is the mixture of hydrochloric acid or phosphoric acid or hydrochloric acid and phosphoric acid;
B agent is that water forms by reductive agent 10-15%, pore forming material 0.3-1.2%, suds-stabilizing agent 0.3-0.6%, surplus, and wherein reductive agent is urea or sodium carbonate or bicarbonate of ammonia; Pore forming material is trimethyl-glycine or sodium laurylsulfonate or sodium lauryl sulphate; Suds-stabilizing agent is polyacrylamide;
C agent is by HCL8-12%, organic acid 6-10%, NH
4hF
22-5%, inhibiter 0.5-1.5%, Fe stabilizer 0.5-1.5%, surplus are that water forms, and wherein organic acid is organic phosphoric acid or acetic acid or organic sulfonic acid or citric acid; Inhibiter is cetylamine or SODIUMNITRATE or hydroxy ethylene diphosphonic acid or diethylenetriamine five fork phosphonic acids; Fe stabilizer is edetate or Citrate trianion or diethylenetriamine pentacarboxylic acid salt;
The volume ratio of A agent and B agent is 1:1.8～2.3, and the volume ratio of A agent and C agent is 1:1.9～2.2.
2. for a using method for the unblocking agent of hypotonic permeable Heterogeneous Sandstone Reservoirs, it is characterized in that: using method is as described below:
The first step: prepare respectively A agent, B agent and C agent in three Agitation Tanks, and make A agent, B agent and C agent uniform mixing under normal temperature, atmospheric pressure state;
Second step: first A agent is injected to stratum by pipeline, beat clear water isolation slug, again B agent is injected to stratum, finally C agent is injected to stratum, the volume ratio of A agent and B agent is 1:1.8～2.3, the volume ratio of A agent and C agent is 1:1.9～2.2, total injection rate of A agent, B agent and C agent is depending on strata condition, and vexed well 8-12 hour after replacing, after in liquid to be mixed, each component is fully reacted, the row of returning that drives a well, then carry out normal water filling or oil recovery.
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