CN104927808A - Treatment agent for solidifying thick oil - Google Patents
Treatment agent for solidifying thick oil Download PDFInfo
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- CN104927808A CN104927808A CN201410108878.7A CN201410108878A CN104927808A CN 104927808 A CN104927808 A CN 104927808A CN 201410108878 A CN201410108878 A CN 201410108878A CN 104927808 A CN104927808 A CN 104927808A
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Abstract
The invention provides a treatment agent for solidifying thick oil, and a method for solidifying thick oil by using the treatment agent. The treatment agent comprises a base solution and a solidifying agent, wherein the solidifying agent comprises an oxidant capable of oxidizing the thick oil, especially an oxidant capable of oxidizing C, N and S in the thick oil to gradually increase the respective content of C=O, S=O and N=O. The treatment agent further comprises assistants, such as a thickener and an adsorbent. The treatment agent for solidifying thick oil can harden thick oil in a well and reduce the adhesion of the thick oil to make the softening point of the solidified thick oil rise, so overflowing thick oil can be effectively solidified; and the treatment agent can also be used to plug thick oil reservoir pores, and the thick oil throughput can reach above 90wt% of weight of the treatment agent.
Description
Technical field
The present invention relates to the technical field of solidification viscous crude, be specifically related to a kind for the treatment of agent for solidifying viscous crude, and use this treatment agent to be cured the method for viscous crude.
Background technology
In Process of Oil Well Drilling, the stratum containing viscous crude may be run into.Going deep into especially along with oil-gas exploration and development, drilling strata becomes increasingly complex, and the chance running into a large amount of viscous crude will increase.Viscous crude has high slumpability and height is collagenous, and therefore viscosity is large, and adhesivity is stronger.Therefore once bore chance viscous crude stratum, can run into a lot of problem, such as drilling fluid leakage, bit freezing, adhesion sleeve pipe, blocking solid control equipment etc., the viscous crude pouring in well can stick drilling tool usually, causes drilling operation to carry out smoothly.In addition, high pressure viscous crude also can pollute drilling fluid, causes property of drilling fluid to reduce, thus causes the ground running pulp even series of problems such as bit freezing.Viscous crude, except the impact having general fluid and invade drilling fluid and downhole safety, also has the unexistent destructiveness of other fluid.Because viscous crude surface properties is oleophylic, cannot mix with water base drilling fluid, thus deal with very difficult.
At present, the method processing viscous crude infringement in drilling process mainly contains following methods: 1) improve densimetry, namely improve drilling fluid density, to suppress viscous crude to immerse by pressure equilibrium, slow down condensed oil polluted drilling fluid speed; 2) emulsion dispersion method, namely when a small amount of viscous crude invades, adds the diesel oil of more than 5% and the emulsifying agent of about 0.3% to disperse viscous crude, is destroyed to prevent property of drilling fluid; 3) Emulsifying, namely adds emulsifying pour depressor and reduces viscosity of thickened oil, improve the mobility of drilling fluid-emulsified viscous oil system; 4) grout off method, namely adopts Fast Setting Cement Slurry shutoff viscous crude stratum, realizes the object of the condensed oil polluted passage of fast blockage.
But the existing method of above-mentioned process viscous crude infringement has some limitations usually.Such as, for raising densimetry, because reservoir pressure distributional difference is very large, once occur condensed oil polluted, under stratum, the drilling fluid density of different positions is difficult to synchronously improve at short notice; For emulsion dispersion method, because the drilling fluid ability to arrange jobs adding diesel oil and emulsifying agent is limited, when the viscous crude of intrusion pit shaft is accumulated to a certain degree, property of drilling fluid just cannot carry out adjusting and improving; For grout off method, deposit in case at viscous crude, the rapid hardening time of Fast Setting Cement Slurry is difficult to accurate assurance, and due to the density difference between grout and viscous crude comparatively large, grout is difficult to stop in immediate vicinity of wellbore, and therefore plugging effect is poor.
At present, the research of the domestic control measures to condensed oil polluted drilling fluid is still few, also rarely has relevant bibliographical information and patent.According to external report, mainly adopt silicate additive at present or a kind of asphalt stabilizer be used for special drilling fluid system to process invade viscous crude in drilling fluid.Such as, the additive treating of US Patent No. P7392846 employing containing one or more silicate pours in the viscous crude in pit shaft, and part reduces the adhesivity of viscous crude.US Patent No. P7665523 adopts a kind for the treatment of solution containing styrene-acrylate polymer react with the viscous crude in well, and partly the adhesivity of reduction viscous crude, makes viscous crude be easy to remove from well.But these two kinds of methods just part reduce the adhesivity of viscous crude, and the viscous crude softening temperature after process is lower, still can not deal with problems when a large amount of viscous crude pours in.A kind of INHIBI-TAR of Halliburton Company of U.S. exploitation
tMasphalt stabilizer (bitumen stabilizer) can react with pitch, make pitch become hard, become fragile, frangible, lose adhesivity, thus avoid its adhere on drilling tool with accumulation.But this stablizer only adds in the BITUMAX WBM drilling fluid system of specific preparation just can obtain good effect, the ability of its solidification viscous crude is also limited.
Summary of the invention
After the present inventor has carried out large quantifier elimination in the technical field at solidification viscous crude, propose using the mixture of oxygenant or oxygenant and auxiliary agent as the solidifying agent solidifying viscous crude first, and the solidification treatment agent that itself and base fluid form is used for the viscous crude solidifying the infringement drilling fluid run in Process of Oil Well Drilling, such as solidify the viscous crude or shutoff thick oil reservoir space that have overflowed.
According to the present invention, providing a kind for the treatment of agent for solidifying viscous crude, comprising base fluid and solidifying agent, this solidifying agent comprise can with the oxygenant of viscous crude generation oxidizing reaction.Further, described oxygenant be can with the oxygenant of at least one generation oxidizing reaction in the atoms such as C, N, the S in viscous crude.Particularly, this oxygenant is such as oxygenant C=O, S=O and N=O content being increased gradually with the atom generation oxidizing reaction such as C, N, S in viscous crude, thus makes viscous crude become hard, and reduces its adhesivity, make its after hardening softening temperature raise.After this oxygenant is heated, its oxidisability strengthens or directly discharges oxidation factor, such as oxygen, chlorine etc.
In a preferred embodiment, solidifying agent also comprises auxiliary agent, and described auxiliary agent is selected from least one in thickening material, sorbent material, flocculation agent, coating agent, swelling agent, clay stabilizer, water retaining.These auxiliary agents added can have synergistic effect with oxygenant, under same solidification effect, can reduce the usage quantity of oxygenant, and in same oxygenant add-on situation, can improve viscous crude hardness and softening temperature.
Thickening material used in the present invention, sorbent material (as gac), flocculation agent (as ironic hydroxide), coating agent (as oil soil), swelling agent, clay stabilizer, water retaining can be all in this area conventional use those.
In solidification viscous crude treatment agent of the present invention, base fluid can be water or water-base drilling fluid.Described oxygenant is acid compounds (comprising organic acid and mineral acid) or salt compounds, superoxide or their mixture with oxidisability.In principle, compound solidifying agent itself being produced to counter productive is not comprised in base fluid.
According to the present invention, described acid compounds is selected from least one in perchloric acid, ferric acid, peroxy-disulfuric acid and Trichloroacetonitrile uric acid; Described superoxide is selected from least one in hydrogen peroxide, sodium peroxide, benzoyl peroxide and potassium hydrogen persulfate; Described salt compounds is selected from least one in oxymuriate, perchlorate, nitrate, permanganate, dichromate (such as potassium bichromate), periodate (such as sodium periodate) and persulphate.The water used in the present invention can be distilled water, tap water, seawater or salt solution; Water-base drilling fluid comprises polymkeric substance potassium drilling fluid.
According to of the present invention for solidifying in the treatment agent of viscous crude, the content of oxygenant is at least 3 % by weight (but being no more than 100 % by weight) based on treatment agent gross weight, such as, be 3-20 % by weight, be preferably 5-10 % by weight.The content of auxiliary agent is the 0-25 % by weight based on treatment agent total weight, is preferably 5-15 % by weight.Softening temperature after the consumption Primary Reference viscous crude solidification of oxygenant and auxiliary agent requires and invades the viscous crude amount of well.The viscous crude amount invading well is large, and viscous crude solidification post softening point is high, then oxygenant consumption is large, otherwise for cost consideration, under the prerequisite reaching expection solidification effect, the consumption of oxygenant is the least possible.
Present invention also offers a kind of method adopting treatment agent as above to be cured viscous crude, comprise and described treatment agent is mixed with viscous crude, viscous crude is solidified.In one embodiment, base fluid can be mixed with solidifying agent, and then mixing cured with viscous crude.In a preferred embodiment, solidification viscous crude method of the present invention comprises and being mixed with viscous crude by base fluid, then oxygenant is added (namely intermittently portion-wise addition) in batches, wherein when solidifying agent also comprises auxiliary agent, auxiliary agent is mixed in the lump with base fluid and viscous crude.In a preferred embodiment, the feed postition of oxygenant is for add once according to reaction times every 20min.Accelerating oxidation agent and viscous crude can react more fully like this, solidification effect is provided.
As required, the reaction times for the treatment of agent and viscous crude can be 1-4h; Temperature of reaction is 70-150 DEG C, is preferably 100-130 DEG C.Visible treatment agent provided by the invention can be applicable to the temperature environment (being generally 70-120 DEG C) on oil drilling stratum well.
In a preferred embodiment in accordance with this invention, when solidifying agent also comprises auxiliary agent, after auxiliary agent is mixed for some time, such as 0.5-2 hour with base fluid and viscous crude, then start portion-wise addition oxygenant.In specific implementation process, before adding oxygenant, first add auxiliary agent, make it fully contact with viscous crude, auxiliary agent is preferentially attached to viscous crude surface; And then adding oxygenant, the auxiliary agent sticking to viscous crude surface can strengthen the oxidation effectiveness of oxygenant, improves solidification effect, under same solidification effect, can reduce the consumption of oxygenant.
When treatment agent provided by the invention being used for shutoff thick oil reservoir hole, usually with the pressure higher than stratum, treatment agent is injected stratum, and maintain at least 1h set time; When solidifying spilling viscous crude (such as having poured in the viscous crude in pit shaft), usually treatment agent being injected into well and reacting at least 1h with viscous crude.
Treatment agent for solidifying viscous crude provided by the invention, except viscous crude in well can be made to become hard, and reduce outside viscous crude adhesivity, also make the viscous crude softening temperature after solidification raise highlightedly, such as exceed at least 40 DEG C than before solidification, under optimum condition, even exceed 100 DEG C.Further, this treatment agent can be pressed in HEAVY OIL RESERVOIR hole, the viscous crude in solidification reservoir pore space, stops viscous crude to pour in well.In addition, the solidifying agent that the present invention uses can adapt to general drilling fluid system, and also can play good effect when viscous crude amount is larger, the treatment capacity of viscous crude can reach more than 90 % by weight for the treatment of agent.
Embodiment
Below in conjunction with specific embodiment, the present invention is further described, but these embodiments do not form the restriction to scope of the present invention.
Embodiment 1
By heavy crude oils of Venezuela, (viscosity of 100 DEG C is 3327mm
2/ s) and water add in 500ml there-necked flask.Under agitation add a part of Trichloroacetonitrile uric acid to react, every 30min adds a Trichloroacetonitrile uric acid continuation reaction afterwards.Wherein, stirring velocity is 60-80r/min, and temperature of reaction is 110 DEG C, and the reaction times is total up to 4h.The mass ratio of the heavy crude oils of Venezuela used, Trichloroacetonitrile uric acid and water is 1:0.2:2.
Reaction terminates the softening temperature of rear measurement viscous crude, and it rises to 62.5 DEG C after solidification by 20 DEG C before solidifying, and viscous crude is at normal temperatures in flocculence, does not have adhesivity.
Embodiment 2
By heavy crude oils of Venezuela, (viscosity of 100 DEG C is 3327mm
2/ s) and KCl polymer drilling fluid (main component is low adhesive aggregation anionic cellulose, sulfonated phenol formaldehyde resin, sulfonated lignite resin, lower with) add in 500ml there-necked flask.Under agitation add a part of Trichloroacetonitrile uric acid to react, every 20min adds a Trichloroacetonitrile uric acid continuation reaction afterwards.Wherein, stirring velocity is 60-80r/min, and temperature of reaction is 100 DEG C, and the reaction times is total up to 1h.The mass ratio of the heavy crude oils of Venezuela used, Trichloroacetonitrile uric acid and drilling fluid is 1:0.1:1.
Reaction terminates the softening temperature of rear measurement viscous crude, and it rises to 64 DEG C after solidification by 20 DEG C before solidifying, and viscous crude is at normal temperatures in flocculence, does not have adhesivity.
Embodiment 3
By Iranian viscous crude, (viscosity of 100 DEG C is 16657mm
2/ s) and KCl polymer drilling fluid add in 500ml there-necked flask.Under agitation add a part of potassium hydrogen persulfate to react, every 20min adds a potassium hydrogen persulfate continuation reaction afterwards.Wherein, stirring velocity is 60-80r/min, and temperature of reaction is 100 DEG C, and the reaction times is total up to 1h.The mass ratio of the Iranian viscous crude, potassium hydrogen persulfate and the drilling fluid that used is 1:0.2:2.
Reaction terminates the softening temperature of rear measurement viscous crude, and it rises to 112 DEG C after solidification by 52 DEG C before solidifying, and viscous crude is hard at normal temperatures, does not have adhesivity.
Embodiment 4
By heavy crude oils of Venezuela, (viscosity of 100 DEG C is 3327mm
2/ s), gac and KCl polymer drilling fluid add in 500ml there-necked flask and react, temperature of reaction is 100 DEG C.After reacting 1 hour, under agitation (stirring velocity is 60-80r/min) adds a part of Trichloroacetonitrile uric acid and reacts, and every 20min adds a Trichloroacetonitrile uric acid and continues reaction afterwards.After starting to add Trichloroacetonitrile uric acid, continue reaction 1h, temperature of reaction is 100 DEG C.The mass ratio of the heavy crude oils of Venezuela used, Trichloroacetonitrile uric acid, gac and drilling fluid is 1:0.1:0.2:1.
Reaction terminates the softening temperature of rear measurement viscous crude, and it rises to 66 DEG C after solidification by 20 DEG C before solidifying, and viscous crude is hard at normal temperatures, does not have adhesivity.
Embodiment 5
By Iranian viscous crude, (viscosity of 100 DEG C is 16657mm
2/ s), Fe (OH)
3flocculation agent and KCl polymer drilling fluid add in 500ml there-necked flask and react, and temperature of reaction is 100 DEG C.After reacting 1 hour, under agitation (stirring velocity is 60-80r/min) adds a part of potassium bichromate and reacts, and every 20min adds a potassium bichromate and continues reaction afterwards.After starting to add potassium bichromate, continue reaction 1h, temperature of reaction is 120 DEG C.The mass ratio of the Iranian viscous crude, potassium bichromate, flocculation agent and the drilling fluid that used is 1:0.1:0.2:1.
Reaction terminates the softening temperature of rear measurement viscous crude, and it rises to 150 DEG C after solidification by 52 DEG C before solidifying, and viscous crude is hard at normal temperatures, does not have adhesivity.
As can be seen from the above embodiments, adopt solidification viscous crude treatment agent provided by the invention to be cured viscous crude, the viscous crude after solidification can be made to become hard, not there is adhesivity; Further, the softening temperature of the viscous crude after solidification significantly raises, and such as, in embodiment 5, even if oxygenant consumption is lower, the softening temperature of the viscous crude after solidification also can raise 100 DEG C nearly.Further, from the contrast of embodiment 2 and 4, the use of auxiliary agent can strengthen the solidification effect of viscous crude further.In addition, the viscous crude amount using the method for solidification viscous crude provided by the invention to process is comparatively large, such as, can reach more than 90 % by weight for the treatment of agent.
Claims (10)
1., for solidifying a treatment agent for viscous crude, comprise base fluid and solidifying agent, described solidifying agent comprise can with the oxygenant of viscous crude generation oxidizing reaction.
2. treatment agent according to claim 1, is characterized in that, described oxygenant be can with the oxygenant of at least one generation oxidizing reaction in C, N and S atom in viscous crude.
3. treatment agent according to claim 1, is characterized in that, described solidifying agent also comprises auxiliary agent, and described auxiliary agent is selected from least one in thickening material, sorbent material, flocculation agent, coating agent, swelling agent, clay stabilizer, water retaining.
4. treatment agent according to claim 1 and 2, is characterized in that, described base fluid is water or water-base drilling fluid; Described oxygenant is acid compounds or salt compounds, superoxide or their mixture with oxidisability.
5. treatment agent according to claim 4, is characterized in that, described acid compounds is selected from least one in perchloric acid, ferric acid, peroxy-disulfuric acid and Trichloroacetonitrile uric acid; Described superoxide is selected from least one in hydrogen peroxide, sodium peroxide, benzoyl peroxide and potassium hydrogen persulfate; Described salt compounds is selected from least one in oxymuriate, perchlorate, nitrate, permanganate, dichromate and periodate; Described water comprises distilled water, tap water, seawater and salt solution; Water-base drilling fluid comprises polymkeric substance potassium drilling fluid.
6. the treatment agent according to any one of claim 1-5, is characterized in that, the content of described oxygenant is at least based on treatment agent gross weight 3 % by weight, is preferably 3-20 % by weight.
7. treatment agent according to claim 6, is characterized in that, the content of auxiliary agent is the 0-25 % by weight based on described treatment agent total weight, is preferably 5-15 % by weight.
8. use as the treatment agent in claim 1-7 as described in any one is cured the method for viscous crude, comprise and base fluid is mixed with viscous crude, then oxygenant is added in batches, wherein when solidifying agent also comprises auxiliary agent, auxiliary agent is mixed in the lump with base fluid and viscous crude.
9. method according to claim 8, is characterized in that, the reaction times for the treatment of agent and viscous crude is 1-4h; Temperature of reaction is 70-150 DEG C, is preferably 100-130 DEG C.
10. method according to claim 8 or claim 9, is characterized in that, when solidifying agent also comprises auxiliary agent, by auxiliary agent with after base fluid and viscous crude mixing 0.5-2 hour, then start portion-wise addition oxygenant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410108878.7A CN104927808B (en) | 2014-03-21 | 2014-03-21 | It is a kind of for solidifying the inorganic agent of viscous crude |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410108878.7A CN104927808B (en) | 2014-03-21 | 2014-03-21 | It is a kind of for solidifying the inorganic agent of viscous crude |
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| CN104927808A true CN104927808A (en) | 2015-09-23 |
| CN104927808B CN104927808B (en) | 2018-12-18 |
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| CN201410108878.7A Active CN104927808B (en) | 2014-03-21 | 2014-03-21 | It is a kind of for solidifying the inorganic agent of viscous crude |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109825261A (en) * | 2019-01-04 | 2019-05-31 | 武汉理工大学 | The asphalt modifier and preparation method thereof for meeting asphalitine harm is bored in compound inhibition |
| CN113121848A (en) * | 2019-12-31 | 2021-07-16 | 中国石油化工股份有限公司 | Heavy oil curing agent, preparation method thereof and modified heavy oil composition |
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| US20060144594A1 (en) * | 2004-12-30 | 2006-07-06 | Halliburton Energy Services, Inc. | Silicate-containing additives for well bore treatments and associated methods |
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2014
- 2014-03-21 CN CN201410108878.7A patent/CN104927808B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060144594A1 (en) * | 2004-12-30 | 2006-07-06 | Halliburton Energy Services, Inc. | Silicate-containing additives for well bore treatments and associated methods |
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| 任立伟 等: "伊朗稠油沥青稠化封堵技术研究与应用I:原位氧化", 《科技导报》 * |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109825261A (en) * | 2019-01-04 | 2019-05-31 | 武汉理工大学 | The asphalt modifier and preparation method thereof for meeting asphalitine harm is bored in compound inhibition |
| CN113121848A (en) * | 2019-12-31 | 2021-07-16 | 中国石油化工股份有限公司 | Heavy oil curing agent, preparation method thereof and modified heavy oil composition |
| CN113121848B (en) * | 2019-12-31 | 2023-01-10 | 中国石油化工股份有限公司 | Heavy oil curing agent, preparation method thereof and modified heavy oil composition |
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