CN105092825A - Screening method of low-permeability reservoir imbibition agent - Google Patents
Screening method of low-permeability reservoir imbibition agent Download PDFInfo
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- 238000005213 imbibition Methods 0.000 title claims abstract description 253
- 238000012216 screening Methods 0.000 title claims abstract description 130
- 238000000034 method Methods 0.000 title claims abstract description 70
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 173
- 230000035699 permeability Effects 0.000 claims abstract description 125
- 239000003027 oil sand Substances 0.000 claims abstract description 51
- 238000012360 testing method Methods 0.000 claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
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- 239000003921 oil Substances 0.000 claims description 104
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- 230000003068 static effect Effects 0.000 claims description 22
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 20
- 230000003247 decreasing effect Effects 0.000 claims description 19
- 239000010779 crude oil Substances 0.000 claims description 14
- 230000008595 infiltration Effects 0.000 claims description 6
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- 239000004576 sand Substances 0.000 claims description 6
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Abstract
The invention provides a screening method of a low-permeability reservoir imbibition agent. The screening method comprises the following steps: carrying out oil sand imbibition effect test on the low-permeability reservoir imbibition agent to be screened to obtain a first screened sample; performing a work of adhesion reduction value test on the first screened sample, and selecting the first screened sample with the work of adhesion reduction value larger than zero to obtain a second screened sample; performing emulsion stability and viscosity tests on the second screened sample to obtain a third screened sample; and (3) carrying out permeability test on the third screened sample, selecting the third screened sample with the permeability value higher than the permeability value of the simulated water of the produced water of the low-permeability reservoir by more than 2 times to obtain the imbibition agent suitable for the low-permeability reservoir, and finishing the screening of the imbibition agent of the low-permeability reservoir after the final step is verified to be qualified through a core experiment. The imbibition agent obtained by the screening method provided by the invention is suitable for common low-permeability oil reservoirs, ultra-low-permeability oil reservoirs and ultra-low-permeability oil reservoirs.
Description
Technical field
The present invention relates to a kind of screening technique being applicable to the imbibition agent of common hypotonic, special hypotonic and Oil in Super-low Permeability oil reservoir, belong to oil reservoir production technique field.
Background technology
The proven reserves of China's low-permeability oil deposit about more than 50 hundred million tons, about 2,000,000,000 tons that have developed at present, also having 3,000,000,000 tons has to be developed, and having over half in annual incremental reserves is LOW PERMEABILITY RESERVOIR.
Generally LOW PERMEABILITY RESERVOIR can be divided into three classes according to permeability: permeability be 10-50mD common LOW PERMEABILITY RESERVOIR, the Oil in Super-low Permeability oil reservoir of permeability to be the ultralow permeable reservoir of 1-10mD and permeability be 0.1-1.0mD.
And special hypotonic also increasing in the reserves newly verified with the occupation rate of this two classes oil reservoir of Oil in Super-low Permeability in hypotonic reserves, about more than 60%.But, the development difficulty of LOW PERMEABILITY RESERVOIR is very large, main cause is that this kind of oil reservoir has special micropore structure, namely hole is tiny, venturi is trickle, blowhole specific surface area is large, rock surface and fluid force strong, in oil reservoir, fluid movement is different from conventional middle oil impregnate Tibetan and high permeability reservoir, often shows as non-darcy flow state.
So far, special hypotonic and Oil in Super-low Permeability oil reservoir has that development degree is low, difficult water injection, there is starting pressure, and exploitation rate is low, low, the moisture height of recovery ratio, the problem that exploitation difficulty is increasing in exploitation.
For the exploitation of LOW PERMEABILITY RESERVOIR, physical method and mechanical means, owing to adopting in the morning of developing, mid-term, can also play the effect keeping certain recovery ratio.But above-mentioned physical method and mechanical means are for the remaining oil in LOW PERMEABILITY RESERVOIR and irreducible oil there is larger difficulty in the startup in tiny hole.
Solving remaining oil and the starting problem of irreducible oil in tiny hole, by adopting chemical reagent to be solved, there is certain advantage.Although comparatively early, theoretical research also deepens continuously in the proposition of imbibition effect.But be scarcely out of swaddling-clothes about the applied basic research of imbibition agent, still lack the assessment indicator system for LOW PERMEABILITY RESERVOIR imbibition agent and method of testing at present, more lack the systems approach of imbibition agent screening and comprehensive evaluation.
Based on above the deficiencies in the prior art and disappearance, provide one to be applicable to LOW PERMEABILITY RESERVOIR, particularly the Integrated Selection method of the imbibition chemical agent for oil recovery of special low, Oil in Super-low Permeability oil reservoir becomes this area problem demanding prompt solution.
Summary of the invention
In order to solve the problems of the technologies described above, one is the object of the present invention is to provide to be applicable to LOW PERMEABILITY RESERVOIR, the screening technique of the particularly imbibition agent of special low, Oil in Super-low Permeability oil reservoir.
To achieve these goals, the invention provides a kind of screening technique of LOW PERMEABILITY RESERVOIR imbibition agent, this screening technique comprises the following steps:
Step one: oil-sand imbibition measure of merit is carried out to LOW PERMEABILITY RESERVOIR imbibition agent to be screened, obtains the first screening sample:
If screen common LOW PERMEABILITY RESERVOIR imbibition agent, then select to 24 hours imbibition efficiency of thin oil-sand higher than 60% LOW PERMEABILITY RESERVOIR imbibition agent;
If screening ultralow permeable reservoir imbibition agent, then select to 24 hours imbibition efficiency of thin oil-sand higher than 50% LOW PERMEABILITY RESERVOIR imbibition agent;
If screening Oil in Super-low Permeability oil reservoir imbibition agent, then select to 24 hours imbibition efficiency of thin oil-sand higher than 30% LOW PERMEABILITY RESERVOIR imbibition agent,
Step 2: the test of adhesion work decreasing value is carried out to the first screening sample, the first screening sample selecting adhesion work decreasing value to be greater than zero, obtains the second screening sample;
Step 3: emulsion stability and viscosity test are carried out to the second screening sample, obtains three screening sample:
If screen common LOW PERMEABILITY RESERVOIR imbibition agent, then select the second screening sample of emulsion stability≤30%;
If screening ultralow permeable reservoir imbibition agent, then select the second screening sample of emulsion stability≤20%;
If screening Oil in Super-low Permeability oil reservoir imbibition agent, then select the second screening sample of emulsion stability≤15%;
If screen common LOW PERMEABILITY RESERVOIR imbibition agent, then select second screening sample of viscosity≤1.0mPas;
If screening ultralow permeable reservoir imbibition agent, then select second screening sample of viscosity≤0.80mPas;
If screening Oil in Super-low Permeability oil reservoir imbibition agent, then select second screening sample of viscosity≤0.80mPas;
Step 4: seepage force test is carried out to three screening sample, selected area update strategy force value is higher than the three screening sample of more than 2 times of the infiltration force value of the Simulated Water of LOW PERMEABILITY RESERVOIR recovered water, obtain the imbibition agent being applicable to LOW PERMEABILITY RESERVOIR, complete the screening to LOW PERMEABILITY RESERVOIR imbibition agent.
In the screening technique of LOW PERMEABILITY RESERVOIR imbibition agent provided by the invention, preferably, in step, the thin oil-sand adopted refers to that silica sand and crude oil are with the formulated oil-sand of the mass ratio of 7:1, or natural oil-sand and crude oil after cleaning are with the formulated oil-sand of the mass ratio of 7:1, or according to the oil-sand that rock type and the mineral composition of LOW PERMEABILITY RESERVOIR are prepared.
During oil-sand according to the rock type of LOW PERMEABILITY RESERVOIR and mineral composition preparation, the Sandstone content according to LOW PERMEABILITY RESERVOIR, shale component content and various carbonate contents etc., then prepare according to various rock proportion of composing, specifically carry out according to the usual manner of those skilled in the art.
In the screening technique of LOW PERMEABILITY RESERVOIR imbibition agent provided by the invention, preferably, the particle diameter of the silica sand of employing is for being greater than 100 orders; Preferred, the particle diameter of the silica sand of employing is 100-160 order.
In the screening technique of LOW PERMEABILITY RESERVOIR imbibition agent provided by the invention, preferably, described adhesion work decreasing value refers to the adhesion work decreasing value that crude oil wets on the sheet of ore deposit at oil.
In the screening technique of LOW PERMEABILITY RESERVOIR imbibition agent provided by the invention, preferably, the screening technique of this LOW PERMEABILITY RESERVOIR imbibition agent also comprises the step of carrying out interfacial tension screening; More preferably, after described step one, described step 2, described step 3 or described step 4, the screening technique of this LOW PERMEABILITY RESERVOIR imbibition agent also comprises the step of carrying out screening interfacial tension.
In above-mentioned screening technique of the present invention, comprise the step of screening interfacial tension, screening interfacial tension is screened LOW PERMEABILITY RESERVOIR imbibition agent further as supplementary means, and the step of screening interfacial tension can be carried out after any step to step 4 in the step one of the screening technique of LOW PERMEABILITY RESERVOIR imbibition agent provided by the invention.
In the screening technique of LOW PERMEABILITY RESERVOIR imbibition agent provided by the invention, preferably, the interfacial tension of the sample obtained after carrying out seepage force screening to three screening sample is lower than 0.1mN/m.
In the screening technique of LOW PERMEABILITY RESERVOIR imbibition agent provided by the invention, preferably, after the imbibition agent obtaining being applicable to LOW PERMEABILITY RESERVOIR, verified by the static imbibition efficiency test of rock core, verify qualified after can carry out practical application:
If screen common LOW PERMEABILITY RESERVOIR imbibition agent, then require the static imbibition efficiency of rock core higher than 40%;
If screening ultralow permeable reservoir imbibition agent, then require the static imbibition efficiency of rock core higher than 30%;
If screening Oil in Super-low Permeability oil reservoir imbibition agent, then require the static imbibition efficiency of rock core higher than 30%.
In above-mentioned screening technique provided by the invention, after carrying out rock core validation test, if not by the test of the static imbibition efficiency of rock core, then to readjust the raw material composition of imbibition agent till meeting rock core validation test.
In above-mentioned screening technique of the present invention, Simulated Water carries out preparing according to the content of ion various in LOW PERMEABILITY RESERVOIR recovered water.
Above-mentioned screening technique provided by the invention, screens the imbibition agent obtained and is applicable to common LOW PERMEABILITY RESERVOIR, ultralow permeable reservoir and Oil in Super-low Permeability oil reservoir, be particularly useful for ultralow permeable reservoir and Oil in Super-low Permeability oil reservoir.
In above-mentioned screening technique provided by the invention, described k value refers to the viscosity (mPas) of the imbibition agent at LOW PERMEABILITY RESERVOIR temperature.
In above-mentioned screening technique of the present invention, described infiltration force value refers to the product of graduated tube seepage velocity value and kapillary lifting coefficient, wherein, graduated tube seepage velocity can measure, kapillary lifting coefficient can measure, carry out all in a conventional manner measuring, after determining two values, just can calculate the value of seepage force.
In above-mentioned screening technique of the present invention, adhesion work decreasing value is that after imbibition agent uses, crude oil adheres to the difference of work value in wet adhesion work value corresponding to the contact angle stationary value on sheet surface, ore deposit and the theory starting oil film of oil.
Theory described in above-mentioned screening technique of the present invention adheres to work value, instigate crude oil to wet the sheet sur-face peeling process of ore deposit from oil, when contact angle reduces to 90 ° of angles by 180 ° that sprawl state, corresponding adhesion work value is defined as and theoretically adheres to work value, namely starts minimum that oil film needs and does work value.
In above-mentioned screening technique provided by the invention, the indexs such as emulsion stability, viscosity, interfacial tension are see the instrument of the related content in company standard " binary is driven and used surfactant technology specification " (Q/SY1583-2013) and operation steps and regulation and Chinese patent application " method for quantitatively evaluating of the comprehensive emulsifiability of emulsifier for oil fields " (application number is 201110069553.9 "), " emulsification of crude oil estimation of stability instrument " (application number is 201210265482.4).Seepage force method of testing needs to carry out capillary force lifting test (concrete grammar is see Chinese patent application " evaluating apparatus of imbibition agent performance and method, application number is 201510092985.X ") and the test of graduated tube seepage velocity, then calculates.The test of adhesion work decreasing value is carried out according to industry standard SY/T5153-1999 " reservoir rocks wettability determination ", adopts OCA20 video contact angle measuring instrument (Dataphysics company).Oil displacement experiment method is carried out with reference to industry standard methods " composite oil-displacing system performance test methods " (SY/T6424-2000).The Chinese patent application " a kind of method for quantitatively evaluating of imbibition agent imbibition oil recovery effect " that the method for testing of oil-sand imbibition efficiency and use instrument are 201310451182.X see application number.
In screening technique of the present invention, by the oil-sand imbibition effect of test LOW PERMEABILITY RESERVOIR imbibition agent, adhesion work decreasing value, emulsion stability, viscosity and seepage force, and parameters is specifically limited, screening obtains one and is applicable to common LOW PERMEABILITY RESERVOIR, ultralow permeable reservoir and Oil in Super-low Permeability oil reservoir, is specially adapted to the imbibition agent of ultralow permeable reservoir and Oil in Super-low Permeability oil reservoir.By following steps, the correctness that method of the present invention is screened parameters is described.Have employed Chang Qingma ridge crude oil and Simulated Water, Chang Qingma ridge oil density is 0.8512g/cm
3, Simulated Water salinity is 23562mg/L, and experimental temperature is 50 DEG C, and thin oil-sand is 100-160 order silica sand and crude oil is that 7:1 is formulated with mass ratio.Rock core adopts low permeability cores of appearing, and wherein, perm-plug method 20mD-11mD represents common LOW PERMEABILITY RESERVOIR, perm-plug method 1.0-10mD represents ultralow permeable reservoir, perm-plug method 0.1-0.99mD represents Oil in Super-low Permeability oil reservoir.Rock core saturated oil adopts Ji's plateau crude oil, and (Ji's plateau oil density is 0.8025g/cm by corresponding stratum Simulated Water for experimental water and preparation imbibition agent hydromining
3, Simulated Water salinity is 13919mg/L).
Screening technique provided by the invention, by screening the imbibition agent of different viscosity, makes the imbibition agent of screening be more suitable for LOW PERMEABILITY RESERVOIR.In order to verify the correlativity of the viscosity of imbibition agent and the static imbibition efficiency of oil-sand, carry out the static imbibition efficiency of oil-sand of the imbibition agent of different viscosity, result as shown in Figure 2.As shown in Figure 2, the viscosity of imbibition agent is higher than imbibition efficiency during 1.20mPas substantially lower than 30%, and viscosity is most higher than 40% lower than the imbibition efficiency of 0.80mPas.Only from this factor, the oil reservoir of the lower and Oil in Super-low Permeability low concerning spy of the viscosity of imbibition agent, imbibition efficiency is higher.That can think that in LOW PERMEABILITY RESERVOIR, tiny hole and fine pore throat limit the action space of molecule, the micromolecular berth is larger, play a role may be larger.
Screening technique provided by the invention, by the restriction to imbibition agent emulsification index, makes the imbibition agent of screening be more suitable for LOW PERMEABILITY RESERVOIR.In order to verify the correlativity of the emulsification index of imbibition agent and the static imbibition efficiency of oil-sand, carried out the static imbibition efficiency of oil-sand of the imbibition agent of different emulsification index, result as shown in Figure 3.Find out from Fig. 3 result, the thin oil-sand experiment that, Oil in Super-low Permeability low for spy is corresponding, the imbibition efficiency of imbibition agent emulsion stability strong (50%) all lower than 20%, imbibition weak effect, this is mainly because emulsion molecular group is large, action space is large, transmit in the tiny hole of LOW PERMEABILITY RESERVOIR and diffusion phase to slowly, therefore action effect is poor.But there will be higher imbibition efficiency (more than 40% many) when emulsion stability index is below 15%.This verifies that screening technique of the present invention is to the correctness of the stable emulsifying Sexual behavior mode of imbibition agent further.
Screening technique provided by the invention, by the mensuration to imbibition agent adhesion work decreasing value, makes the imbibition agent of screening be more suitable for LOW PERMEABILITY RESERVOIR.In order to verify the correlativity of the adhesion work decreasing value of imbibition agent and the static imbibition efficiency of oil-sand, carry out the static imbibition efficiency of oil-sand of the imbibition agent of different contact angle, shown in result table 1.Experimental result in table 1 illustrates, imbibition agent J-1, J-2, J-5, J-6 can, wherein the fastest be J-2, J-3 and J-4 effect comparatively slowly, do not have within 20min to peel off oil film.As shown in Table 1, imbibition agent crude oil is departed from time on sheet surface, ore deposit is short, speed fast, imbibition effect is better.If make crude oil depart from from surface, contact angle is made to drop to less than 90 ° by the angle of more than 140 °, therefore, imbibition agent should be able to make oil change to less than 90 ° the contact angle of mineral surface is minimum, corresponding adhesion work value when reducing to 90 ° of angles is defined as and theoretically adheres to work value by we, is also to start minimum that oil film needs to do work value.If stablize angle to become less, illustrate that the ability of this agent stripping oil film is stronger.
Table 1
Table 2
Same oil wet quartz mine sheet, same oil and Simulated Water (during Ji's plateau Simulated Water 70 DEG C, interfacial tension is 0.877mN/m) is adopted to prepare imbibition agent sample, experimental temperature is 70 DEG C, oil-sand adopts the fine-grained quartz sand preparation of more than 100-160 order or 160 orders, and oil-sand is aging all more than 3 weeks.Carry out the static imbibition efficiency of oil-sand of the imbibition agent of different contact angle, result is as shown in table 2, and the time difference of oil film is peeled off in 6 kinds of imbibition agent.J-4 and J-3 has used 20min and 30min to make, and contact angle change is small, adhesion work reduces seldom, and the actual of these two kinds of imbibition agent is cooked the minimum of work value lower than theoretical demand, and therefore enough could not start oil film in a long time, imbibition ability is weak.And peel off oil film used time shorter J-2, J-5 and J-1 and just make contact angle change greatly within a short period of time, the acute angle being less than 60 ° is become from the obtuse angle of 160-180 °, adhesion work falls much lower, the amplitude speed that is larger, that start oil film adhering to work value higher than theory is faster, thus, the correctness that screening technique of the present invention measures adhesion work decreasing value is demonstrated further.
Screening technique provided by the invention, by the restriction to imbibition agent seepage force, makes the imbibition agent of screening be more suitable for LOW PERMEABILITY RESERVOIR.In order to verify the correlativity of the seepage force of imbibition agent and the static imbibition efficiency of oil-sand, carry out the static imbibition efficiency test of oil-sand of the imbibition agent of different seepage force, shown in result Fig. 4.Because this index does not have reference frame, by comparing of the test result of imbibition agent and Simulated Water, then judge imbibition agent infiltration force value in which region is more suitable for applying in low permeability cores according to the rock core imbibition result of correspondence.With the result of Simulated Water for normative reference.Imbibition agent corresponding in Fig. 4 is stronger than the seepage force of Simulated Water, substantially irreducible oil can be started, but what what speed had had soon is slow, seepage force (Fp) is when more than 2 times of Simulated Water, find that its rate of percolation just hurry up, particularly YS9191 is for special hypotonic good with static imbibition effect that is Oil in Super-low Permeability rock core, and the effect for dynamic imbibition might as well.Therefore, after illustrating that other index of a kind of imbibition agent reaches requirement, the examination of seepage force index is very important for the efficient imbibition agent of selection.
Screening technique provided by the invention, by the restriction to imbibition agent interfacial tension, makes the imbibition agent obtained be more suitable for LOW PERMEABILITY RESERVOIR.In order to verify the correlativity of imbibition agent interfacial tension and the static imbibition efficiency of oil-sand, test the static imbibition efficiency of oil-sand of the imbibition agent of different interfacial tension, result as shown in Figure 1.As can be seen from Figure 1, in the majority more than 50% of the region imbibition efficiency that interfacial tension value is in below 0.1mN/m, interfacial tension is greater than the oil-sand imbibition efficiency many places of 1.0mN/m in less than 10%.So interfacial tension is too high bad for imbibition effect the low and Oil in Super-low Permeability oil reservoir of spy, in experimental data imbibition efficiency higher than 70% the interfacial tension value of imbibition agent in ultra low levels (1 × 10
-3mN/m) below also few.Only consider from interfacial tension factor, interfacial tension can reach good imbibition effect lower than below 0.1mN/m, also has other factors to have impact to imbibition efficiency as can be seen from Figure 1 simultaneously.
The screening technique of LOW PERMEABILITY RESERVOIR imbibition agent provided by the invention, establishes the Integrated Selection method being applicable to LOW PERMEABILITY RESERVOIR imbibition agent, has filled up the blank both at home and abroad in this, has had the following advantages;
By screening technique of the present invention, the parameter index being applicable to the imbibition agent of LOW PERMEABILITY RESERVOIR obtained all meets the requirements, and has good practicality;
The method of testing of each parameter index in screening technique provided by the invention and the selection of material all consider the cheap factor with being convenient to purchase, and test workable, are convenient to the carrying out of indoor a large amount of evaluation experimental;
Screening technique of the present invention is a kind of quick, indoor enforceable screening technique, has convenience and high efficiency;
The test of screening technique of the present invention to every single index has taken into account formation condition and feature, has good simulation.
Accompanying drawing explanation
Fig. 1 is the imbibition agent of different interfacial tension of the present invention and the relation curve of imbibition efficiency;
Fig. 2 is the imbibition agent of different viscosity of the present invention and the relation curve of imbibition efficiency;
Fig. 3 is the imbibition agent of different emulsion stability of the present invention and the relation curve of imbibition efficiency;
Fig. 4 is the imbibition agent of different seepage force of the present invention and the relation curve of imbibition efficiency.
Embodiment
In order to there be understanding clearly to technical characteristic of the present invention, object and beneficial effect, existing following detailed description is carried out to technical scheme of the present invention, but can not be interpreted as to of the present invention can the restriction of practical range.
In order to contrast the difference of imbibition agent and stratum Simulated Water effect, first oil-sand (100-160 order) is adopted to carry out the imbibition experiment of two kinds of local waters, the imbibition efficiency of stratum, result Shi Changqingma ridge Simulated Water is 6.52%, and the imbibition efficiency of Ji's plateau stratum Simulated Water is 0.091%.After Ji's plateau profit saturated core, the imbibition efficiency doing imbibition experiment by stratum Simulated Water is 8.74%, and this result is more effective than oil-sand, and reason is that in the hole of rock core and venturi, capillary force has played certain effect to spontaneous imbibition.
Embodiment 1
Present embodiments provide a kind of screening technique of LOW PERMEABILITY RESERVOIR imbibition agent, this screening technique comprises the following steps:
The first step of screening is, the oil-sand imbibition efficiency of test preliminary election imbibition agent.Select 100-160 order oil-sand, corresponding is oil reservoir that is special low and Oil in Super-low Permeability, if reach the requirement of Oil in Super-low Permeability, then can be suitable at ultralow permeable reservoir and common LOW PERMEABILITY RESERVOIR, but wish that oil-sand imbibition efficiency value is more high better, so be 30% carry out primary election with oil-sand imbibition rate here, the selection result is as shown in table 1.
Table 1
As can be seen from Table 1, above-mentioned 10 kinds of imbibition agent with Chang Qingma ridge water run business into particular one together oil-sand (100-160 order) imbibition experiment, result is concerning the oil-sand of Ma Ling and long celebrating Ji plateau, imbibition efficiency higher than 30% respectively have 8 kinds, and imbibition efficiency lower than 30% have respective local water, the imbibition agent of DS-2 type and the imbibition agent of DS-5 type and the imbibition agent of DS-2 type and DS-4 type imbibition agent, but DS-4 type imbibition Ji Duima ridge block can continue examination, DS-5 can continue examination to Ji's plateau block.Therefore, after first step oil-sand imbibition agent screening, the imbibition agent that DS-2 type imbibition agent is not suitable as the hypotonic region oil reservoir of above-mentioned two blocks is obtained.
Second step is the result of several imbibition agent adhesion work decreasing value of test residue, if the adhesion work decreasing value of imbibition agent is higher than theoretical adhesion work value, i.e. and its difference (Δ W=W
actual-W
theoretical) be greater than 0, then illustrate that imbibition agent can start the oil film of oil wet surface, can consider to continue other index of examination.Owing to all using oil wet ore deposit built-in testing contact angle, put into oil droplet before and after imbibition agent can unify to be set as 180 degree at the first contact angle on sheet surface, ore deposit, so, what the minimum angle of theoretical adhesion work was corresponding is 90 degree, and stable contact angle corresponding to imbibition agent is θ, then can start oil film during the adhesion work decreasing value >0 of imbibition agent, then oil film can not be started during its adhesion work decreasing value≤0, adhesion work relative change rate is higher, and start oil film effect better, test result is as shown in table 2.
Table 2
From table 2, viewed from result, the adhesion work decreasing value of the imbibition agent of all models is all greater than 0, the oil film on the wet sheet surface, ore deposit of oil can be peeled off viewed from this result, adhesion work relative change rate (on the occasion of) higher stripping oil film ability is stronger, but the action intensity in tiny hole also by the impact of other factors, needs to examine further.From interfacial tension value, in two kinds of agent that adhesion work relative value is on the low side, the interfacial tension value of a kind of DS-1 (2) is just had to be greater than 0.1mN/m, and other 5 kinds of effective imbibition agent, its interfacial tension value is all lower than 0.1mN/m.So suggestion is hidden for oily wet oil, the interfacial tension value of imbibition agent is unsuitable too high.
3rd step is tested the emulsion stability of above-mentioned imbibition agent and viscosity, viscosity is oozed not higher than 0.80mPas for the ultralow oil reservoir of spy, emulsion stability index for Oil in Super-low Permeability oil reservoir not higher than 15%, special not hypotonicly to be advisable higher than 20%, test result is as shown in table 3.
Table 3
In table 3, result is found out, although JS703 type imbibition agent adhesion work reduces and oil-sand imbibition efficiency all reaches requirement, its viscosity is that 2.38mPas and emulsion stability value 23.56% all exceed ideal indicator.Therefore, from this two indices, to spy, low and Oil in Super-low Permeability is all not suitable for.YS122 type imbibition Ji Duima ridge viscosity, at rim value, can continue examination.DS-1 (2) type imbibition agent emulsion stability meets the requirements but k value has exceeded boundary, and this Ji Duima ridge block can not do and continue examination.
4th step is the seepage force index of examination residue imbibition agent, and compares with the value of Simulated Water, if permeate more than 2 times of force value higher than Simulated Water, think that effect is more satisfactory, can continue to examine other index, result is as shown in table 4.
Table 4
As can be seen from Table 4, the infiltration force value of above-mentioned 5 kinds of imbibition agent is all high than 2 times of Simulated Water, and the infiltration force value of just DS-3 type imbibition agent is close to rim value, and through preliminary screening, above-mentioned 5 kinds of imbibition agent all meet the requirements.
Final step is the static imbibition efficiency value of testing rock core.If rock core (0.1-1mD) or permeability (1-10mD) imbibition efficiency are more than more than 30%, just think that the imbibition of imbibition agent is satisfactory for result, can be used as the imbibition agent that performance evaluation is qualified, be applicable to special hypotonic and Oil in Super-low Permeability oil reservoir, if rock core (more than 10mD) imbibition efficiency is more than 40%, also think that imbibition agent is at least applicable to common hypotonic oil reservoir.The length of experiment rock core is 10.0cm, and diameter is the natural exposure rock core of 2.50cm.
In order to verify the feasibility of screening technique, imbibition agent all in the present embodiment is all carried out core experiment, but from rock core imbibition result, result is as shown in table 5, the rock core imbibition effect meeting the imbibition agent of index request substantially all meets the requirements, and effect better (DS-3 and YS9193, YS9191, YS7072 type imbibition agent).For the undesirable imbibition agent of a certain index, rock core imbibition effect does not substantially reach requirement (as DS-2, DS-1 (2), JS703 imbibition agent) yet.So in several screening step, any one does not meet the requirements of all needs again to screen, meet the requirements but abnormal also will again the screening (as YS122 type imbibition agent) of core experiment appearance.
Table 5
Though DS-3 type imbibition agent perviousness is in edge, do not reach 40% for common low permeability cores imbibition effect and exceeded the special requirement of hypotonic 30%, its indices is qualified, and the common LOW PERMEABILITY RESERVOIR that permeability can be selected slightly higher is used.The indices of YS122 type imbibition agent is qualified, and just k value is on border, so see for the imbibition result of the water saturated special low permeability cores close to Oil in Super-low Permeability of horse ridge oil, very undesirable, so need again to screen.The every performance assessment criteria of YS9193, YS9191, YS7072 type imbibition agent all meets the requirements, wherein YS9193, YS7072 type imbibition agent is applicable to special hypotonic, YS9191 type imbibition agent obtains extraordinary imbibition effect in Oil in Super-low Permeability rock core, illustrate that this imbibition agent is not only applicable to Oil in Super-low Permeability oil reservoir, also can be applicable to ultralow permeable reservoir.
The main composition of the imbibition agent related in the present invention, as shown in table 6.
Table 6
To sum up embodiment illustrates, it is necessary for controlling the indexs such as the oil-sand imbibition efficiency of imbibition agent, emulsion stability, viscosity and seepage force for screening imbibition agent.Under the prerequisite lacking clear and definite theoretical foundation, this screening technique is adopted to be that the commercial Application of imbibition agent provides experimental basis and necessary means.
Claims (10)
1. a screening technique for LOW PERMEABILITY RESERVOIR imbibition agent, this screening technique comprises the following steps:
Step one: oil-sand imbibition test is carried out to LOW PERMEABILITY RESERVOIR imbibition agent to be screened, obtains the first screening sample:
If screen common LOW PERMEABILITY RESERVOIR imbibition agent, then select to 24 hours imbibition efficiency of thin oil-sand higher than 60% LOW PERMEABILITY RESERVOIR imbibition agent;
If screening ultralow permeable reservoir imbibition agent, then select to 24 hours imbibition efficiency of thin oil-sand higher than 50% LOW PERMEABILITY RESERVOIR imbibition agent;
If screening Oil in Super-low Permeability oil reservoir imbibition agent, then select to 24 hours imbibition efficiency of thin oil-sand higher than 30% LOW PERMEABILITY RESERVOIR imbibition agent;
Step 2: the test of adhesion work decreasing value is carried out to described first screening sample, the first screening sample selecting adhesion work decreasing value to be greater than zero, obtains the second screening sample;
Step 3: emulsion stability and viscosity test are carried out to described second screening sample, obtains three screening sample:
If screen common LOW PERMEABILITY RESERVOIR imbibition agent, then select the second screening sample of emulsion stability≤30%;
If screening ultralow permeable reservoir imbibition agent, then select the second screening sample of emulsion stability≤20%;
If screening Oil in Super-low Permeability oil reservoir imbibition agent, then select the second screening sample of emulsion stability≤15%;
If screen common LOW PERMEABILITY RESERVOIR imbibition agent, then select second screening sample of viscosity≤1.0mPas;
If screening ultralow permeable reservoir imbibition agent, then select second screening sample of viscosity≤0.80mPas;
If screening Oil in Super-low Permeability oil reservoir imbibition agent, then select second screening sample of viscosity≤0.80mPas;
Step 4: seepage force test is carried out to described three screening sample, selected area update strategy force value is higher than the three screening sample of more than 2 times of the infiltration force value of the Simulated Water of LOW PERMEABILITY RESERVOIR recovered water, obtain the imbibition agent being applicable to LOW PERMEABILITY RESERVOIR, complete the screening to LOW PERMEABILITY RESERVOIR imbibition agent.
2. the screening technique of LOW PERMEABILITY RESERVOIR imbibition agent according to claim 1, wherein, in step one, described thin oil-sand refers to that silica sand and crude oil are with the formulated oil-sand of the mass ratio of 7:1.
3. the screening technique of LOW PERMEABILITY RESERVOIR imbibition agent according to claim 1, wherein, in step one, described thin oil-sand refers to that natural oil-sand and crude oil are with the formulated oil-sand of the mass ratio of 7:1.
4. the screening technique of LOW PERMEABILITY RESERVOIR imbibition agent according to claim 1, wherein, in step one, described thin oil-sand refers to the oil-sand prepared according to rock type and the mineral composition of LOW PERMEABILITY RESERVOIR.
5. the screening technique of LOW PERMEABILITY RESERVOIR imbibition agent according to claim 2, wherein, the particle diameter of described silica sand is for being greater than 100 orders.
6. the screening technique of LOW PERMEABILITY RESERVOIR imbibition agent according to claim 1, wherein, described adhesion work decreasing value refers to the adhesion work decreasing value that crude oil wets on the sheet of ore deposit at oil.
7. the screening technique of LOW PERMEABILITY RESERVOIR imbibition agent according to claim 1, wherein, the screening technique of this LOW PERMEABILITY RESERVOIR imbibition agent also comprises the step of carrying out interfacial tension screening.
8. the screening technique of LOW PERMEABILITY RESERVOIR imbibition agent according to claim 7, wherein, after described step one, described step 2, described step 3 or described step 4, the screening technique of this LOW PERMEABILITY RESERVOIR imbibition agent also comprises the step of carrying out screening interfacial tension.
9. the screening technique of LOW PERMEABILITY RESERVOIR imbibition agent according to claim 7, wherein, in the step of screening interfacial tension, the interfacial tension of the sample obtained after carrying out seepage force screening to three screening sample is lower than 0.1mN/m.
10. the screening technique of LOW PERMEABILITY RESERVOIR imbibition agent according to claim 1, wherein, after the imbibition agent obtaining being applicable to LOW PERMEABILITY RESERVOIR, is verified by the static imbibition efficiency test of rock core, verify qualified after namely carry out practical application:
If screen common LOW PERMEABILITY RESERVOIR imbibition agent, then require the static imbibition efficiency of rock core higher than 40%;
If screening ultralow permeable reservoir imbibition agent, then require the static imbibition efficiency of rock core higher than 30%;
If screening Oil in Super-low Permeability oil reservoir imbibition agent, then require the static imbibition efficiency of rock core higher than 30%.
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