CN105178929A - Heterogeneous reservoir shielding and acidizing technique - Google Patents
Heterogeneous reservoir shielding and acidizing technique Download PDFInfo
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- CN105178929A CN105178929A CN201510632782.5A CN201510632782A CN105178929A CN 105178929 A CN105178929 A CN 105178929A CN 201510632782 A CN201510632782 A CN 201510632782A CN 105178929 A CN105178929 A CN 105178929A
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Abstract
The invention provides a heterogeneous reservoir shielding and acidizing technique. The heterogeneous reservoir shielding and acidizing technique comprises the following steps of (1) judging heterogeneity of a heterogeneous reservoir, injecting a first temporary blocking agent into an oil well when the heterogeneity of the reservoir is severe and severe loss does not exist under the condition that injection amount is calculated according to a formula I, and injecting a second temporary blocking agent in the oil well when the heterogeneity of the reservoir is particularly severe and severe loss exists under the condition that injection amount is calculated according to the formula I; (2) injecting spacer fluid for isolating under the condition that designed injection amount of every one-meter advanced oil layer is 15-20 squares; and (3) injecting acid liquor for removing plug under the condition that injection amount is calculated according to the formula I. In the formula I, Q equals Pi R2h and is the injection amount, R is a treating radius, and h is the thickness of the oil layer. The heterogeneous reservoir shielding and acidizing technique can shield and acidize the heterogeneous reservoir economically and effectively, and is easy to construct and operate and good in acidizing effect; and other layering measures are not required.
Description
Technical field
The present invention designs a kind of heterogeneous reservoir shielding acidification technique method, belongs to technical field of petroleum extraction.
Background technology
Shuguang Oilfield ligh-oil reservoir drops into exploitation in July, 1975, and in March, 1976 starts water filling.The impact that long-term production and water filling make ligh-oil reservoir be subject to from outside and inner various factors, cause oil layer pollution to block, regular de-plugging has become the important technical guaranteeing thin oil well stable yields.But by the impact of Reservoir Heterogeneity, adopt conventional general acidification technique, the acid solution injected major part can enter high permeability formation, be difficult to act on hyposmosis pollution layer, after measure, high permeability formation permeability increases further, Liquid output ascensional range is comparatively large, but declining seldom even appears in oil production raising, and measure effect is deteriorated year by year.Longitudinally employ uneven contradiction for main force block, usually adopt machinery card envelope, layering de-plugging mode solves, but some oil wells is by Restraining barrier or be less than 2m, and the factor interference such as casing deformation, cannot implement layering de-plugging process.In addition, traditional work-in-progress control technique adopts foam or polyacrylamide gel system to block up temporarily usually, but the former intensity is lower, need add gel breaker when the latter breaks glue, and blocking agent return row property poor, stratum residual rate is high, very easily causes formation damage.
Summary of the invention
In view of the defect that above-mentioned prior art exists, the object of the invention is to propose a kind of heterogeneous reservoir shielding acidification technique method, can economical, effectively to heterogeneous reservoir shielding acidifying.
Object of the present invention is achieved by the following technical programs:
A kind of heterogeneous reservoir shielding acidification technique method, it comprises the steps:
Step one, judges the non-homogeneity of heterogeneous reservoir, and when reservoir heterogeneity is given prominence to, when there is not severe leakage, inject the first shielding diverting agent to oil well, injection rate calculates according to formula I;
When reservoir heterogeneity is outstanding especially, when there is severe leakage, inject secondary shielding diverting agent to oil well, injection rate calculates according to formula I;
Step 2, inject insulating liquid and isolate, injection rate is often advance the design injection rate of 1 rice bran oil layer thickness to be 15-20 side;
Step 3, inject acid solution and carry out de-plugging, injection rate calculates according to formula I;
Wherein, formula I is Q=π R
2h, Q are injection rate, and unit is m
3; R is treatment radius, and unit is m; H is core intersection, and unit is m;
Wherein, by percentage to the quality, described first shielding diverting agent comprises the melon glue of 0.4-0.6wt%, the borax of 0.03-0.05wt% and excess water; Described secondary shielding diverting agent comprises the melon glue of 0.5-0.7wt%, the borax of 0.04-0.06wt%, the oil-soluble resin particle of 1wt%-3wt% and excess water.
In above-mentioned heterogeneous reservoir shielding acidification technique method, leakage is the conventional term of this area, there is not severe leakage and refers in sand washing process and can return out; There is severe leakage to refer in sand washing process and can not return out.
In above-mentioned heterogeneous reservoir shielding acidification technique method, reservoir heterogeneity is given prominence to and is given prominence to especially can judge according to the routine of this area with reservoir heterogeneity; Preferably, described non-homogeneity is outstanding refers to that permeability extreme difference is between 50-200; Described non-homogeneity is outstanding especially refers to that permeability extreme difference is between 200-400.
In above-mentioned heterogeneous reservoir shielding acidification technique method, injection rate is according to high permeability formation thickness, and degree of porosity and treatment radius design; Preferably, the injection rate of described first shielding diverting agent is 20-30 ton.
In above-mentioned heterogeneous reservoir shielding acidification technique method, injection rate is according to high permeability formation thickness, and degree of porosity and treatment radius design; Preferably, the injection rate of described secondary shielding diverting agent is 30-50 ton.
In above-mentioned heterogeneous reservoir shielding acidification technique method, insulating liquid plays the effect to shielding diverting agent insulation blocking, after preventing shielding diverting agent underground polymerization plastic, runs into acid solution and broken glue lost efficacy; Preferably, described insulating liquid is water, but is not limited thereto.
In above-mentioned heterogeneous reservoir shielding acidification technique method, diverting agent blocks up temporarily, and acid solution carries out brokenly glue de-plugging, and described acid solution is the mud acid system that reaction temperature is low, speed is fast, solution ration is strong; Preferably, described acid solution is the mixed solution comprising HCl, HF, KCl and corrosion inhibiter, in described acid solution, the mass percent concentration of the mass percent concentration of HCl to be the mass percent concentration of 8%-10%, HF be 1.5%-4.5%, KCl is 3%, the mass percent concentration of corrosion inhibiter is 0.3%-0.5%.
In above-mentioned heterogeneous reservoir shielding acidification technique method, preferably, described corrosion inhibiter is imidazoline corrosion inhibitor and/or Mannich bases corrosion inhibiter.
In above-mentioned heterogeneous reservoir shielding acidification technique method, preferably, described corrosion inhibiter comprises azimidobenzene and/or HEDP.
In above-mentioned heterogeneous reservoir shielding acidification technique method, injection rate is according to high permeability formation thickness, and degree of porosity and treatment radius design; Preferably, the injection rate of acid solution is often advance the design injection rate of 1 rice bran oil layer thickness to be 40-60 ton.
In above-mentioned heterogeneous reservoir shielding acidification technique method, the speed injecting medicament keeps 0.3-0.5m for making injection pressure
3force value under the normal injection rate of/min; Preferably, the speeds control injecting medicament is making injection pressure not higher than 17MPa.
In above-mentioned heterogeneous reservoir shielding acidification technique method, described medicament refers to the first shielding diverting agent, secondary shielding diverting agent, insulating liquid and acid solution.
In above-mentioned heterogeneous reservoir shielding acidification technique method, it is at 0.3-0.5m that injection pressure measures
3measure under the normal injection rate condition of/min; Preferably, when injecting secondary shielding diverting agent, when injection pressure is lower than 8MPa, by percentage to the quality, described secondary shielding diverting agent comprises the melon glue of 0.5-0.7wt%, the borax of 0.04-0.06wt%, the oil-soluble resin particle of 1.5-3wt% and excess water;
Injection pressure is when about 8-10MPa, and by percentage to the quality, described secondary shielding diverting agent comprises the melon glue of 0.5-0.7wt%, the borax of 0.04-0.06wt%, the oil-soluble resin particle of 1-1.5wt% and excess water.
In above-mentioned heterogeneous reservoir shielding acidification technique method, be greater than 10MPa when injection pressure and under being not more than 17MPa condition, the oil-soluble resin content in described secondary shielding diverting agent can reduce to about 1wt%.
Outstanding effect of the present invention is:
Heterogeneous reservoir of the present invention shielding acidification technique method, can economical, effectively to heterogeneous reservoir shielding acidifying, construction is simple, it is easy to operate, without the need to carrying out other layering measures, acidizing effect is good; Compared with other work-in-progress control methods, having that easy construction, risk are little, success rate high, providing new effective ways for solving thin oil high water cut viscous heavy crude oil oil layer blocking problem.
Detailed description of the invention
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.Experimental technique described in following embodiment, if no special instructions, is conventional method; Described reagent and material, if no special instructions, all can obtain from commercial channels.
Embodiment 1
The present embodiment provides a kind of heterogeneous reservoir to shield acidification technique method, implements heterogeneous reservoir shielding acidification technique, comprise the steps: oil field 2-7-008 well
Step one, judges the non-homogeneity of heterogeneous reservoir, and the present embodiment oil reservoir non-homogeneity is outstanding especially, there is severe leakage, and inject secondary shielding diverting agent 40 tons to oil well, injection pressure rises to 15MPa by 0MPa; Wherein, by percentage to the quality, secondary shielding diverting agent comprises the melon glue of 0.4wt%, the borax of 0.04wt%, the oil-soluble resin particle of 1wt% and excess water;
Step 2, injected clear water 20 side isolate, and injection pressure remains on about 13-15MPa;
Step 3, inject acid solution 60 tons and carry out de-plugging, injection pressure is down to 3Mpa by 13MPa; Wherein, acid solution is for comprising the mixed solution of HCl, HF, KCl and corrosion inhibiter (HEDP), wherein, the mass percent concentration of HCl is 10%, the mass percent concentration of HF is 4%, the mass percent concentration of KCl is 3%, the mass percent concentration of corrosion inhibiter is 0.5%.
The oil well of the present embodiment before enforcement heterogeneous reservoir shielding acidification technique method, day production fluid 5.1 tons, day produce oil 0.3 ton, after enforcement heterogeneous reservoir shielding acidification technique method day production fluid 17.8 tons, day produce oil 4.5 tons.
Embodiment 2
The present embodiment provides a kind of heterogeneous reservoir to shield acidification technique method, implements heterogeneous reservoir shielding acidification technique, comprise the steps: oil field 2-7-411 well
Step one, judges the non-homogeneity of heterogeneous reservoir, and the present embodiment oil reservoir non-homogeneity is outstanding especially, there is severe leakage, according to formula Q=π R
2h calculates, and inject secondary shielding diverting agent 30 tons to oil well, injection pressure rises to 12MPa by 0MPa; Wherein, by percentage to the quality, secondary shielding diverting agent comprises the melon glue of 0.4wt%, the borax of 0.04wt%, the oil-soluble resin particle of 1.5wt% and excess water;
Step 2, injected clear water 15 side isolate, and injection pressure remains on about 10-12MPa;
Step 3, inject acid solution 40 tons and carry out de-plugging, injection pressure is down to 2Mpa by 10MPa; Wherein, acid solution is for comprising the mixed solution of HCl, HF, KCl and corrosion inhibiter (azimidobenzene), wherein, the mass percent concentration of HCl is 8%, the mass percent concentration of HF is 3%, the mass percent concentration of KCl is 3%, the mass percent concentration of corrosion inhibiter is 0.3%.
The oil well of the present embodiment before enforcement heterogeneous reservoir shielding acidification technique method, day production fluid 15 tons, day produce oil 0.3 ton, after enforcement heterogeneous reservoir shielding acidification technique method day production fluid 25 tons, day produce oil 3.5 tons.
Embodiment 3
The present embodiment provides a kind of heterogeneous reservoir to shield acidification technique method, implements heterogeneous reservoir shielding acidification technique, comprise the steps: oil field 2-9-011 well
Step one, judges the non-homogeneity of heterogeneous reservoir, and the present embodiment oil reservoir non-homogeneity is given prominence to, and there is not severe leakage, and the first slug injects the first shielding diverting agent to oil well and injects diverting agent 25 tons, and injection pressure rises to 17MPa by 5MPa; Wherein, by percentage to the quality, the first shielding diverting agent comprises the melon glue of 0.4wt%, the borax of 0.03wt% and excess water;
Step 2, the second slug injected clear water 10 side isolate, and injection pressure remains on about 16-17MPa;
Step 3, the 3rd slug inject acid solution 45 tons and carry out de-plugging, and injection pressure is down to 3Mpa by 17MPa; Wherein, acid solution is for comprising the mixed solution of HCl, HF, KCl and imidazoline corrosion inhibitor (azimidobenzene), wherein, the mass percent concentration of HCl is 10%, the mass percent concentration of HF is 4.5%, the mass percent concentration of KCl is 3%, the mass percent concentration of imidazoline corrosion inhibitor is 0.5%.
The oil well of the present embodiment before enforcement heterogeneous reservoir shielding acidification technique method, day production fluid 1.4 tons, day produce oil 0.5 ton, after enforcement heterogeneous reservoir shielding acidification technique method day production fluid 13.5 tons, day produce oil 3.8 tons.
Comparative example
This comparative example provides a kind of acidification technique of routine, implements work-in-progress control technique, comprise the steps: oil field 2-8-4C well
First slug injects diverting agent 35 tons, and operation pressure rises to 20MPa by 5MPa; By percentage to the quality, this diverting agent comprises following component: the NH of the formaldehyde of HPAM, 0.15wt% of 0.4wt%, the resorcinol of 0.02wt%, 0.03wt%
4, the oxalic acid of 0.015wt% and the water of surplus;
Second slug injected clear water 15 side isolates, and pressure remains on about 20MPa;
3rd slug injects acid solution 50 tons, and pressure keeps 20MPa not fall; Wherein, acid solution is for comprising the mixed solution of HCl, HF, KCl and imidazoline corrosion inhibitor (azimidobenzene), wherein, the mass percent concentration of HCl is 9%, the mass percent concentration of HF is 4.0%, the mass percent concentration of KCl is 3%, the mass percent concentration of imidazoline corrosion inhibitor is 0.5%.
The acidification technique production fluid day before yesterday 4.2 tons implemented by this well, day produce oil 0.3 ton, do not produce after implementing acidification technique.
Therefore, the heterogeneous reservoir of embodiment of the present invention shielding acidification technique method, can economical, effectively to heterogeneous reservoir shielding acidifying, construction is simple, it is easy to operate, without the need to carrying out other layering measures, acidizing effect is good; And compared with comparative example, easy construction, risk are little, success rate is high.
Claims (10)
1. a heterogeneous reservoir shielding acidification technique method, it comprises the steps:
Step one, judges the non-homogeneity of heterogeneous reservoir, and when reservoir heterogeneity is given prominence to, when there is not severe leakage, inject the first shielding diverting agent to oil well, injection rate calculates according to formula I;
When reservoir heterogeneity is outstanding especially, when there is severe leakage, inject secondary shielding diverting agent to oil well, injection rate calculates according to formula I;
Step 2, inject insulating liquid and isolate, injection rate is often advance the design injection rate of 1 rice bran oil layer thickness to be 15-20 side;
Step 3, inject acid solution and carry out de-plugging, injection rate calculates according to formula I;
Wherein, formula I is Q=π R
2h, Q are injection rate, and unit is m
3; R is treatment radius, and unit is m; H is core intersection, and unit is m;
Wherein, by percentage to the quality, described first shielding diverting agent comprises the melon glue of 0.4-0.6wt%, the borax of 0.03-0.05wt% and excess water; Described secondary shielding diverting agent comprises the melon glue of 0.5-0.7wt%, the borax of 0.04-0.06wt%, the oil-soluble resin particle of 1wt%-3wt% and excess water.
2. heterogeneous reservoir shielding acidification technique method according to claim 1, is characterized in that: described non-homogeneity is outstanding refers to that permeability extreme difference is between 50-200; Described non-homogeneity is outstanding especially refers to that permeability extreme difference is between 200-400.
3. heterogeneous reservoir shielding acidification technique method according to claim 1, is characterized in that: the injection rate of described first shielding diverting agent is 20-30 ton.
4. heterogeneous reservoir shielding acidification technique method according to claim 1, is characterized in that: the injection rate of described secondary shielding diverting agent is 30-50 ton.
5. heterogeneous reservoir shielding acidification technique method according to claim 1, is characterized in that: described insulating liquid is water.
6. heterogeneous reservoir shielding acidification technique method according to claim 1, it is characterized in that: described acid solution is the mixed solution comprising HCl, HF, KCl and corrosion inhibiter, in described acid solution, the mass percent concentration of the mass percent concentration of HCl to be the mass percent concentration of 8%-10%, HF be 1.5%-4.5%, KCl is 3%, the mass percent concentration of corrosion inhibiter is 0.3%-0.5%.
7. heterogeneous reservoir shielding acidification technique method according to claim 6, is characterized in that: described corrosion inhibiter is imidazoline corrosion inhibitor and/or Mannich bases corrosion inhibiter; Preferably, described corrosion inhibiter comprises azimidobenzene and/or HEDP.
8. heterogeneous reservoir shielding acidification technique method according to claim 1, is characterized in that: the injection rate of acid solution is often advance the design injection rate of 1 rice bran oil layer thickness to be 40-60 ton.
9. heterogeneous reservoir shielding acidification technique method according to claim 1, is characterized in that: the speeds control injecting medicament is making injection pressure not higher than 17MPa.
10. heterogeneous reservoir shielding acidification technique method according to claim 1, it is characterized in that: when injecting secondary shielding diverting agent, when injection pressure is lower than 8MPa, by percentage to the quality, described secondary shielding diverting agent comprises the melon glue of 0.5-0.7wt%, the borax of 0.04-0.06wt%, the oil-soluble resin particle of 1.5-3wt% and excess water;
Injection pressure is when 8-10MPa, and by percentage to the quality, described secondary shielding diverting agent comprises the melon glue of 0.5-0.7wt%, the borax of 0.04-0.06wt%, the oil-soluble resin particle of 1-1.5wt% and excess water.
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Cited By (2)
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| CN110318725A (en) * | 2019-06-28 | 2019-10-11 | 中石化石油工程技术服务有限公司 | A kind of remodeling method of geothermal reservoir |
| CN111980655A (en) * | 2019-05-21 | 2020-11-24 | 中国石油化工股份有限公司 | Modification method for carbonate reservoir |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111980655A (en) * | 2019-05-21 | 2020-11-24 | 中国石油化工股份有限公司 | Modification method for carbonate reservoir |
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Application publication date: 20151223 |