CN102953718B - Composite alternative acid dissolving method of hyposmosis oil layer - Google Patents
Composite alternative acid dissolving method of hyposmosis oil layer Download PDFInfo
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Abstract
The invention relates to a composite alternative acid dissolving method of a hyposmosis oil layer. The composite alternative acid dissolving method of the hyposmosis oil layer comprises the following steps of: selecting an acidifying modified storage layer section; carrying out storage layer microanalysis on the acidifying modified storage layer section; carrying out corrosion inhibition acid diving supply on the acidifying modified storage layer section; and carrying out main body acid karst chambering on the acidifying modified storage layer section. According to the composite alternative acid dissolving method of the hyposmosis oil layer, the problem that the success rate of the conventional acidifying method is low is solved and the composite alternative acid dissolving method has the advantages of effectively evaluating a hyposmosis storage layer and improving a hyposmosis oil layer oil production capability.
Description
Technical field
The present invention relates to oil testing tech and the production practice of hyposmosis clastic rock oil reservoir, particularly relate to a kind of low permeability pay compound alternately acid-soluble method.
Background technology
Low permeability pay due to filtrational resistance large, in fluid migration process, energy ezpenditure is many, strata pressure and flowing pressure low, production capacity is poor.Many employing fracturing technologies formation testing at present, the initial stage obtains high yield, but production decline is fast, and production rate-maintenance capability is poor.Along with deepening continuously of being familiar with low permeability reservoir stratum characteristic and cause of injury, increasing novel acid solution and additive and acidification technique in succession occur and start application, but on-the-spot success rate is still not satisfactory, unclearly there are much relations with being familiar with the hyposmosis clastic reservoir rock origin cause of formation at present.
The starting point of tradition acidization tool and technique has departed from the self character of oil and gas reservoir, focus on that certain omnipotent acidizing recipe of tackling key problem goes generally to be applicable to all kinds of complex oil and gas reservoir, and not do not set out according to the feature of clastic rock oil and gas reservoir itself and condition, formulate acid-soluble formula with strong points and strategy.The preferred acidifying in current scene design mainly evaluates the situation of change of porosity and permeability by the change of various sensitivity tests, sour reagent type, and does not do origin cause of formation Analysis on Mechanism, and what can not reach truly is preferred, has certain blindness.Therefore, although acidizing treatment well is more, the success rate of overall acidifying does not have substantial raising.
To sum up, the principal element of the acidifying of restriction hyposmosis at present reservoir success rate has following 2 points:
First, reservoir genesis mechanism is not implemented, the sedimental structure of terrestrial facies hyposmosis clastic reservoir rock and mineralogic maturity is on the low side, reservoir properties is poor, porosity is low, pore throat radius is little, matrix permeability is low, diagenesis difference is large, stress sensitivity strong, local cracks is comparatively grown, macroscopic view and microheterogeneity partially strong.The Crack cause of low-permeability oil gas reservoir is mainly controlled by the factor such as depositional environment and tectonic movement.And post-sedimentary diagenesis, comprise the hyle of diagenesis, compaction, diagenetic temperature, the power of diagenesis, diagenesis types and diagenesis liquid property etc. be also important influence factor.For the reservoir in particular studies district, the research of the origin cause of formation of low permeability reservoir, the mechanism of action of microcosmic influence factors, concrete manifestation form before acidizing treatment, not promptly and accurately implement unclear.
Secondly, novel acid solution and additive and low permeability reservoir matching bad, cause the secondary injury to reservoir.Because deep layer and even super deep low-permeability clastic reservoir rock deposit, diagenesis difference is large, cement type is complicated.The compatibility of novel acid solution and additive and hyposmosis clastic rock is poorer, needs laboratory optimal screening repeatedly.This research aspect needs scientific research personnel to carry out petromineralogy and acid treatment of oil formation renovation technique crossing research, for form, characteristic, the content of mineral constituent, formulates and fills a prescription targetedly, injection order reasonable in design and injection pressure.This type of research requires that engineering staff and rock forming mineral scientific research personnel are combined with each other, and just can reach and hold accurately reservoir.
We have invented a kind of new low permeability pay compound alternately acid-soluble method for this reason, solve above technical problem.
Summary of the invention
The object of this invention is to provide a kind of can effective evaluation low permeability reservoir and improve the low permeability pay compound alternately acid-soluble method of Middle-Low Permeability Reservoirs oil productive capacity.
Object of the present invention realizes by following technical measures: low permeability pay compound is acid-soluble method alternately, and this low permeability pay compound alternately acid-soluble method comprises selection acidifying transformation Reservoir Section; Reservoir micro-analysis is carried out to this acidifying transformation Reservoir Section; According to this reservoir micro-analysis result, inhibition acid is carried out to this acidifying transformation Reservoir Section and slips into and scoop out; And according to this reservoir micro-analysis result, the reaming of main acid karst is carried out to this acidifying transformation Reservoir Section.
Object of the present invention also realizes by following technical measures:
This low permeability pay compound alternately acid-soluble method is also included in and carries out before inhibition acid slips into the step scooped out, according to this reservoir micro-analysis result, carrying out prepad fluid pretreatment to this acidifying transformation Reservoir Section to this acidifying transformation Reservoir Section.
This prepad fluid comprises hydrochloric acid and hydrofluoric acid.
The concentration of this hydrochloric acid is 13%, and the concentration of hydrofluoric acid is 1%.
This low permeability pay compound after alternately acid-soluble method is also included in and carries out the step of main acid karst reaming to this acidifying transformation Reservoir Section, according to this reservoir micro-analysis result, carries out after pad slagging-off to this acidifying transformation Reservoir Section.
This after pad comprises the steady agent of inorganic expansion-resisting agent, organic clay stabilizers and iron.
Select acidifying transformation Reservoir Section step in, select oiliness high and apart from upper and lower water-bearing layer apart from large interval.
This comprises analysis rock framework to the step that this acidifying transformation Reservoir Section carries out reservoir micro-analysis, analyzes chink occurrence status, analyzes clay mineral type and characteristic, assessment wetability and molten drench test, and defines corrosion speed.
Carrying out this acidifying transformation Reservoir Section, inhibition is sour slips in the step scooped out, and uses ammonium acid fluoride as this inhibition acid.
The concentration of this ammonium acid fluoride is 10%.
Carrying out in the step of main acid karst reaming to this acidifying transformation Reservoir Section, this main acid comprises hydrochloric acid and hydrofluoric acid.
The concentration of this hydrochloric acid is 12%, and the concentration of this hydrofluoric acid is 2%.
Low permeability pay compound in the present invention is acid-soluble method alternately, for specific aim sampling, design and carried out reservoir micro-analysis test, reservoir conventionally test analysis foundation has increased newly low permeability reservoir grain fabric, the research of the type parameter such as enabling capabilities that granularmetric composition and chip character determine, supplement chink kind, content, test and the assessment component such as the microcosmic occurrence status of chink in reservoir.On the basis of the clear and definite reservoir hyposmosis origin cause of formation, in conjunction with the molten drench experiment of indoor rock forming mineral, by the sequencing of adjustment acid solution type, concentration, injection, all kinds of mineral constituent corrosion of objective evaluation Reservoir Section effect.In line with improving pore throat radius, increase the permeability of reservoir in acidizing radius, and effectively prevent the principles and aims that collapses, evade the secondary injury to low permeability reservoir, improve the penetrating power of reservoir to greatest extent.In conjunction with on-the-spot acidification technique urban d evelopment, formulate acidizing treatment scheme with strong points.The present invention compared with prior art, has the following advantages:
Low permeability pay compound alternately acid-soluble accessories rebuilding technology is defined through tackling key problem research and innovation; achieve the perfect adaptation of petrological and mineralogical study and oil layer protection and modification measures mechanism; and the perfect research of the aspect such as the hypotonic feature of reservoir and Injury Mechanism analysis, the grade of effectively evaluating low permeability reservoir and transformation potential.Formulate to obtain reasonable effective acidifying auxiliary plan for reservoir microscopic differences and feature, achieve the natural energy making full use of Middle-Low Permeability Reservoirs, significantly improve the object of Middle-Low Permeability Reservoirs oil productive capacity, technological achievement entirety is reached the international leading level.
Accompanying drawing explanation
Fig. 1 is the flow chart that low permeability pay compound of the present invention replaces acid-soluble method;
Fig. 2 is the schematic diagram of taupe oil immersion siltstone in well 2918.54m place in one embodiment of the invention;
Fig. 3 is the schematic diagram of well 2921.55m place oil mark packsand in one embodiment of the invention.
Detailed description of the invention
For making above and other object of the present invention, feature and advantage can become apparent, cited below particularly go out preferred embodiment, and coordinate institute's accompanying drawings, be described in detail below.
As shown in Figure 1, Fig. 1 is the flow chart that low permeability pay compound of the present invention replaces acid-soluble method.In step 101, carry out specific aim sampling, select acidifying transformation Reservoir Section.Select the principle of layer mainly to comprise two aspects: first, interval of interest has good oiliness, oil bearing grade selects more than oil mark rank.In one embodiment, the 2918.1m-2922.0m well section geological logging of well, sidewall coring, drilling and coring delivery all see oil immersion, oil mark display; Secondly, interval of interest is larger apart from upper and lower water-bearing layer distance, in one embodiment, target zone well log interpretation is oil-water common-layer under upper oil reservoir (2.9m), top is oil-water common-layer bottom oil-containing water layer distance 10.4m, perforated interval, and apart from bottom another oil-water common-layer distance 4.6m, up and down all by mud stone packing.Flow process enters into step 102.
In step 102, reservoir micro-analysis is carried out to acidifying transformation Reservoir Section, comprises and analyze rock framework, chink occurrence status, clay mineral type and characteristic, assessment wetability and molten drench test, and define corrosion speed etc.Flow process enters into step 103.
On the basis of the hypotonic origin cause of formation of clear and definite reservoir, in conjunction with indoor rock forming mineral molten drench experiment, acid strength preferably and the how quick hypotonic feature of target zone, has formulated this acidization tool.In step 103, prepad fluid pretreatment is carried out to acidifying transformation Reservoir Section, 13% hydrochloric acid+1% hydrofluoric acid is adopted to carry out pretreatment as prepad fluid to reservoir, main purpose is the ferroan dolomite that dissolves in pore throat and impels reservoir wettability to reverse, remove clay mineral to the constraint effect of oil phase, it is comparatively abundant that guarantee acid solution enters reaction that is rear and calking mineral.Flow process enters into step 104.
In step 104, inhibition acid is carried out to acidifying transformation Reservoir Section and slips into and scoop out, ammonium acid fluoride (NH
4hF
2) acidity own is extremely weak, very micro-to pore throat chink dissolution, but dived and be placed in reservoir inside, meet hydrochloric acid and then slowly can decomposite hydrogen fluoride (HF), further corrosion silicate chink, another effect of its " at a slow speed " is then be not easy that calcium ion is combined with fluorine ion to form calcirm-fluoride (CaF
2) precipitation.Flow process enters into step 105.
In step 105, the reaming of main acid karst is carried out to acidifying transformation Reservoir Section, main acid is that one gently joins mud acid, itself is higher to the corrosion efficiency of carbonate cementation and clay filling mixed type reservoir, but due to the effect of prepad fluid in this well layer, the main body liquid entered has three kinds of effects: one is continue to dissolve charges in nearly well band reservoir venturi; Two is for deep layer prepad fluid provides hydrochloric acid; Three be 2% mud acid continue corrosion deep clay and to mix base (carbonate is dissolved by prepad fluid).Flow process enters into step 106.
In step 106, after pad slagging-off is carried out to acidifying transformation Reservoir Section: due to the enforcement of aforementioned acid-soluble step, now have a large amount of residual acid in reservoir, clay mineral may recover expansion character along with the reduction of acidity, therefore must add inorganic expansion-resisting agent in after pad; Free clay must add organic clay stabilizers to be fixed; The dissolving of ferroan dolomite can dissociate a large amount of iron ions, must add iron chelating agent and be stablized.This few class ingredients also can inject stratum with preposition acid, but considers the complexity of its product, adopts rearmounted injection mode in this well section.Flow process terminates.
Work progress should strengthen following link: first, and employing mud acid, sustained-release acid are alternately clamp-oned, and reach deep acidification, improve stratum filtration ability; Secondly, target zone is comparatively near apart from upper and lower oil-containing water layer, controls operational discharge capacity, pressure, avoids acid-etched fracture pressure to wear water layer; Again, reservoir pressure coefficient is lower, companion's fluid injection nitrogen, and raising acid solution is returned row and led; In addition, adopt the liquid integrated tubing string of acidizing pump pump drainage, after acidifying, do not spray direct lower beam discharge opeing, accelerate drain age velocity.Concrete acidizing recipe is as shown in table 1 below:
table 1 Reservoir Section acidifying transformation formula
In the step 102 shown in Fig. 1, reservoir micro-analysis is carried out to acidifying transformation Reservoir Section, comprises and analyze rock framework, chink occurrence status, clay mineral type and characteristic, assessment wetability and molten drench test, and define corrosion speed etc.In one embodiment, well reservoir 2918.10-2923.00m Reservoir Section, actual measurement permeability only has 1.25 × 10
-3μm
2, belong to ultra-permeable reservior, experimental analysis finds that this Reservoir Section diagenetic phenomenon is complicated, carbonate cements and shale content higher, concrete grammar acidifying transformation Reservoir Section being carried out to reservoir micro-analysis is as follows:
(1) rock Study on frame
The various contact relations existed between skeleton particle and chink are one of key factors affecting acidizing design scheme.For the reservoir rock of Sandstone Types, its skeleton is that, grade different, distinct by composition sand grains not etc. forms through cementing.Skeleton particle is that pore-fluid provides seepage flow space and seepage channel (visualize is porosity, permeability two parameters), and the quality that acidifying transformation metapore oozes performance maintains primarily of rock mass structure skeleton.
In the present embodiment, well 2918-2922mm Reservoir Section is based on taupe oil immersion powder, particulate landwaste arkose, each component content is as shown in table 2: quartz content mainly concentrates on 43% ~ 51%, potassic feldspar 5% ~ 8%, plagioclase 15% ~ 26%, calcite 1%, ankerite 7% ~ 17%, can reach 26% individually, shale 5% ~ 11%, separately see a little siderite, 1% ~ 4%.
The rigid particles content such as quartz, feldspar are higher, play good skeletal support effect, landwaste based on metamorphic rock landwaste, a little magmatic rock landwaste, accidental sedimentary rock landwaste.Calcite content is few, and exists mainly with debris form.Main cement is ankerite, a little siderite and clay mineral.
table 2 well X diffraction total rock analysis result
(2) chink occurrence status research
Chink is the chemogenic mineral such as the intergranular silicate of phalanges frame, carbonate, sulfate mainly, and the final purpose of acidifying is all attempt the chink component dissolves in reservoir and the row of returning, improve the percolation ability of reservoir successively, therefore, the growth form of chink in reservoir and content, be directly connected to the development of acid formula.
In the present embodiment, the chink that well is main is ankerite, a little siderite and clay mineral.This research has increased the research of chink occurrence status newly.Ankerite cement is comparatively grown, and as shown in Figures 2 and 3, Fig. 2 is well 2918.54m place taupe oil immersion siltstone, and ankerite mainly fills intergranular pore with tufted for feature and occurrence status performance, occupies hole and venturi distribution along grain edges; Fig. 3 is well 2921.55m place oil mark packsand, and this degree of depth is based on micro-crystal structure, and specific area is large, and scanning electron microscopic observation ankerite micropore is grown.Siderite: grumeleuse shape dispersion distribution, is mainly distributed in hole, occupies venturi a little.Calcite: crystallite-aplitic texture, dispersion distribution, most regions is chip output, plays faint supporting role.Shale: general and ankerite mixes, or occupies separately pore throat space.
(3) clay mineral type and characteristic research
Mostly the sensitiveness of reservoir is to be caused by the clay mineral in rock texture, acid-sensitive, is often caused by the chemical bond thing in reservoir.In one embodiment, the clay-X diffraction analysis of the husky three times delta front sand in wellblock shows, clay mineral is based on illite, and content is generally between 79% ~ 91%, and illite/smectite mixed layer 6% ~ 20%(illite/smectite mixed layer is than 20%), kaolinite 1% ~ 2%.
The clay mineral of this Reservoir Section is the reservoir based on illite, usually show as and there is certain porosity, and permeability value is lower, mainly due to formation " bridge blinding " that illitic " bridging " characteristic causes, being not suitable for of the faint acid-base value of injection liquid, salinity, just may cause the reduction of reservoir permeability, therefore such reservoir possesses the quick and quick characteristic of salt of higher alkali.
(4) wetability assessment
Through experimental determination, this Reservoir Section rock core has water-wet behavior, and examination takes out that a technique water outlet is not fuel-displaced also demonstrates the hydrophilic characteristic of reservoir from the side.Be necessary to do wettability reversal process in acidifying rebuilding construction, this technology takes the hydrofluoric acid adding 1% in preposition acid to carry out wettability reversal, increases its lipophile, thus evades High water cut saturation degree to a certain extent.
(5) molten drench test assessment
According to the principle reducing construction cost and the rationally effectively main chink of process (ankerite and clay mineral), select hydrochloric acid and hydrofluoric acid as main acid, experiment laboratory experiment is respectively to concentration (10%, 13%, 15%) hydrochloric acid and (1%, 2%, 3%) hydrofluoric acid carries out preferably, find HF energy corrosion ankerite and the clay mineral of the HCL and 2% of 13%, cave in cause to prevent skeleton particle and shake out, add conventional corrosion inhibiter ammonium acid fluoride.Experimentally result identification: the HCL of the 13% and HF of 2% can preferably corrosion process is main afterwards chink-ankerite, also the clay mineral mixed in together with ankerite can be carried out preferably, make Areal porosity be increased to 15% from 3%, the radius of main venturi is increased to 12 ~ 20um from 2 ~ 5um.Good improve throat radius while, also improve porosity.Rock sample molten drench effect is also very desirable: oil immersion siltstone sample permeates rate brings up to 35.20md by 1.80md.Oil mark packsand sample permeates rate brings up to 29.6md by 0.30md.
(6) corrosion speed defines
Corrosion speed defines the main content considering two aspects: the anti-collapse anti-row of returning of shaking out and being conducive to raffinate and reactant.Calculate according to stress: target zone minimum principal stress 44.5MPa, top barrier stress 48.9MPa; Bottom barrier stress 48MPa, barrier stress difference 3.5-4.4MPa, difference is less, and therefore injection pressure is unsuitable excessive, avoids pressure to wear water layer.
It will be understood by those skilled in the art that and the invention is not restricted to the above-mentioned embodiment enumerated, when not deviating from scope of the present invention as defined by the appended claims, can various amendment and interpolation be carried out.
Claims (1)
1. low permeability pay compound alternately acid-soluble method, is characterized in that, this low permeability pay compound alternately acid-soluble method comprises:
Select acidifying transformation Reservoir Section, select acidifying transformation Reservoir Section step in, select oiliness high and apart from upper and lower water-bearing layer apart from large interval;
Reservoir micro-analysis is carried out to this acidifying transformation Reservoir Section, the step that this acidifying transformation Reservoir Section carries out reservoir micro-analysis comprises analysis rock framework, analyzes chink occurrence status, analyzes clay mineral type and characteristic, assessment wetability and molten drench test, and define corrosion speed;
According to this reservoir micro-analysis result, inhibition acid is carried out to this acidifying transformation Reservoir Section and slips into and scoop out; And
According to this reservoir micro-analysis result, carry out prepad fluid pretreatment to this acidifying transformation Reservoir Section, this prepad fluid comprises hydrochloric acid and hydrofluoric acid; Afterwards the reaming of main acid karst is carried out to this acidifying transformation Reservoir Section, and then after pad slagging-off is carried out to this acidifying transformation Reservoir Section; Described inhibition acid is hydrogen fluoride, and described main acid comprises hydrochloric acid and hydrofluoric acid.
2. low permeability pay compound according to claim 1 alternately acid-soluble method, it is characterized in that, the concentration of this hydrochloric acid is 13%, and the concentration of hydrofluoric acid is 1%.
3. low permeability pay compound according to claim 1 alternately acid-soluble method, it is characterized in that, this after pad comprises the steady agent of inorganic expansion-resisting agent, organic clay stabilizers and iron.
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| CN104564022A (en) * | 2014-09-03 | 2015-04-29 | 北京石大博诚科技有限公司 | BOSW supermicro oil production test liquid construction method |
| CN107446566B (en) * | 2016-05-31 | 2020-09-18 | 中国石油化工股份有限公司 | Preposed acid liquid for deep shale gas horizontal well fracturing and acid pretreatment method |
| CN107965306B (en) * | 2016-10-20 | 2020-03-27 | 中国石油化工股份有限公司 | Acid injection fracturing method |
| CN113219544B (en) * | 2020-05-18 | 2023-07-25 | 中国海洋石油集团有限公司 | Metamorphic rock composition logging identification method based on relative hydrogen index |
| CN112502685B (en) * | 2020-12-03 | 2022-03-11 | 西南石油大学 | Carbonate reservoir alternating acid pressure series optimization method considering thermal effect |
| CN112595653B (en) * | 2021-03-05 | 2021-05-07 | 西南石油大学 | Stress sensitivity analysis method for porosity of loose sandstone reservoir of granular clay mineral |
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