CN105482792A - Preparation method of small particle size water-soluble temporary plugging agent for oil fields - Google Patents
Preparation method of small particle size water-soluble temporary plugging agent for oil fields Download PDFInfo
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- CN105482792A CN105482792A CN201410471431.6A CN201410471431A CN105482792A CN 105482792 A CN105482792 A CN 105482792A CN 201410471431 A CN201410471431 A CN 201410471431A CN 105482792 A CN105482792 A CN 105482792A
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- plugging agent
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Abstract
The present invention provides a preparation method of a small particle size water-soluble temporary plugging agent for oil fields. A purpose of the present invention is to effectively solve the intralayer heterogeneity problem of the reservoir. The small particle size water-soluble temporary plugging agent is prepared by uniformly mixing 5-15% by mass of an inorganic salt, 1.5% by mass of a dispersant, and 0.25-0.65% by mass of a particle size control agent, wherein the inorganic salt, the dispersant and the particle size control agent are added to water according to a certain mass ratio and uniform mixing is performed so as to obtain the water-soluble temporary plugging agent. According to the present invention, during the acidification operation construction, the temporary plugging agent particles are precipitated after the temporary plugging agent contacts the acid, the particle size range is 8-25 [mu]m, the rapid and automatic plugging removal can be achieved by recovering normal water injection after completing the acidification, and the plugging removal rate is more than or equal to 92%.
Description
The present invention relates to the preparation method of the water-soluble temporary plugging agent of a kind of oil field small particle size, for water injection well acidizing treatment.
Background technology
The feature of petroleum drilling technique is: well is dark, pressure is large, temperature is high, influence factor is many.In the past mainly by experience drilling well, began one's study the fifties factors and mutual relationship thereof that affect drilling speed and cost.Drilling well new technology, new theory constantly occur.Well direction must control in allowed band.According to oil-gas exploration, the palegeology condition of exploitation and requirement of engineering, point straight well and orientation well two class, the latter can be divided into general orientation well, horizontal well, cluster wells etc. again.。Drilling fluid, is commonly called as mud, and English Translation is drillingmud, is acknowledged as the blood of oil drilling, plays very important effect in drilling operation.Therefore require very high to drilling fluid, mainly contain four aspects:
1. the requirement of drilling circulationthe requirement of drilling circulation to drilling fluid is pump pressure low (viscosity is low), and prop-carrying capacity strong (yield value is high), ejector priming forces down (gel strength is low), and lubricity is good, and frictional force is low, wear and tear little (solid particulate is few).
keep the stable of wellpressure column and the reservoir pressure of the stratum drilling fluid drilled average out, and drilling fluid density is stablized; The pressure column of drilling fluid to be leaned on during Oil And Gas Formations During Drilling to carry out the pressure requirements drilling fluid density of balanced oil and gas suitable.Require that drilling fluid has the performance overcoming nonresistant strata, such as mud stone water-swelling causes well to shrink; Conglomerate, volcanics are met water and are caused across collapsing, and rock salt is met water and forms solution cavity etc., namely requires drilling fluid of different nature.
require that drilling fluid protecting hydrocarbon zone is bored to openafter hydrocarbon zone, drilling fluid contacts with hydrocarbon zone, for preventing drilling fluid damage hydrocarbon zone, require that the dehydration of drilling fluid is little, mud cake is thin (after drilling fluid dehydration, solid pressure difference solid particulate forms mud cake ring on the borehole wall), solid load hydration that is low, filtrate low (chemical action that filtrate occurs with the liquid in stratum after entering stratum) etc.
protection of the environment and ecologynormal containing crude oil, diesel oil and various oils and containing a large amount of chemical processing agent in drilling fluid, for preventing drilling fluid on environment and the ecological impact that may cause, require to use harmless, nontoxic drilling fluid.The function of mud is a lot, mainly landwaste is carried into ground from shaft bottom.Along with making rapid progress of oil field scientific-technical progress, drilling fluid enters to develop into adapt to drilling well each side demand from only meeting bit drills.1. bottom-hole cleaning, suspension cutting carring, keeps well to clean.2. equilibrium strata pressure, stabilizing borehole, prevents well slough, blowout, leakage.3. transmit water-horse power, to help drill bit breaking up rock.4. for mud motor transmits power.5. cool drill bit, drilling tool.6. utilize drilling fluid to carry out geology, gas detection logging.Oil field in actual water injection well operation process, because of the existence of interlayer and in-layer heterogeneity, the high permeability formation of least resistance, acid solution preferentially enters; The interlayer contradiction of aggravation water injection well.Current water-soluble temporary plugging agent particle diameter is comparatively large, is difficult to enter reservoir, cannot solves the in-layer heterogeneity problem of reservoir when being applied to low-permeability oilfield.。
Summary of the invention
The invention provides the preparation method of the water-soluble temporary plugging agent of a kind of oil field small particle size, effectively solve the in-layer heterogeneity problem of reservoir.A preparation method for the water-soluble temporary plugging agent of oil field small particle size, is characterized in that: comprise inorganic salt, dispersion agent, size controlling agent, said components mixes formulated; Wherein, with the gross weight of this water-soluble temporary plugging agent for benchmark, the content of inorganic salt is 5%-15%, dispersant is 1.5%, size controlling agent content is 0.25%-0.65%, and described content and ratio are mass percent, inorganic salt, dispersion agent, size controlling agent is added to the water in proportion, mix, obtain described water-soluble temporary plugging agent.
according to specific embodiment of the invention scheme, described inorganic salt be selected from sodium salicylate, P-TOLUENE SULFO ACID 99's sodium one or both.Described dispersion agent be selected from methyl alcohol, ethanol, propyl alcohol, propyl carbinol one or more.Described size controlling agent be selected from primary isoamyl alcohol, normal hexane, EDTMPS, ATMP one or more.
utilize the water-soluble temporary plugging agent of the present inventionpreparation method
, in acidizing treatment construction, after meeting acid, namely separate out temporary plugging agent particle, between particle size range 8 μm-25 μm, effectively can enter the lower reservoir of rate of permeation, stifled rate is more than or equal to 96% temporarily, acidifying terminates the normal water filling of rear recovery and gets final product fast automatic de-plugging, and de-plugging rate is more than or equal to 92%.
Specific embodiment
A preparation method for the water-soluble temporary plugging agent of oil field small particle size, is characterized in that: comprise inorganic salt, dispersion agent, size controlling agent, said components mixes formulated; Wherein, with the gross weight of this water-soluble temporary plugging agent for benchmark, the content of inorganic salt is 5%-15%, dispersant is 1.5%, size controlling agent content is 0.25%-0.65%, and described content and ratio are mass percent, inorganic salt, dispersion agent, size controlling agent is added to the water in proportion, mix, obtain described water-soluble temporary plugging agent.
according to specific embodiment of the invention scheme, described inorganic salt be selected from sodium salicylate, P-TOLUENE SULFO ACID 99's sodium one or both.Described dispersion agent be selected from methyl alcohol, ethanol, propyl alcohol, propyl carbinol one or more.Described size controlling agent be selected from primary isoamyl alcohol, normal hexane, EDTMPS, ATMP one or more.
Claims (1)
1. a preparation method for the water-soluble temporary plugging agent of oil field small particle size, is characterized in that: comprise inorganic salt, dispersion agent, size controlling agent, said components mixes formulated; Wherein, with the gross weight of this water-soluble temporary plugging agent for benchmark, the content of inorganic salt is 5%-15%, dispersant is 1.5%, size controlling agent content is 0.25%-0.65%, and described content and ratio are mass percent, inorganic salt, dispersion agent, size controlling agent is added to the water in proportion, mix, obtain described water-soluble temporary plugging agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410471431.6A CN105482792A (en) | 2014-09-17 | 2014-09-17 | Preparation method of small particle size water-soluble temporary plugging agent for oil fields |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410471431.6A CN105482792A (en) | 2014-09-17 | 2014-09-17 | Preparation method of small particle size water-soluble temporary plugging agent for oil fields |
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| CN105482792A true CN105482792A (en) | 2016-04-13 |
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| CN201410471431.6A Pending CN105482792A (en) | 2014-09-17 | 2014-09-17 | Preparation method of small particle size water-soluble temporary plugging agent for oil fields |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106905941A (en) * | 2017-03-21 | 2017-06-30 | 中国石油集团渤海钻探工程有限公司 | The pressure break preparation method of high intensity solubility nano_scale particle diverting agent |
| CN106967401A (en) * | 2017-03-21 | 2017-07-21 | 中国石油集团渤海钻探工程有限公司 | A kind of pressure break soluble nano-scale particle diverting agent of high intensity |
-
2014
- 2014-09-17 CN CN201410471431.6A patent/CN105482792A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106905941A (en) * | 2017-03-21 | 2017-06-30 | 中国石油集团渤海钻探工程有限公司 | The pressure break preparation method of high intensity solubility nano_scale particle diverting agent |
| CN106967401A (en) * | 2017-03-21 | 2017-07-21 | 中国石油集团渤海钻探工程有限公司 | A kind of pressure break soluble nano-scale particle diverting agent of high intensity |
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Application publication date: 20160413 |