CN103045199A - Process for preparing drilling fluid based on control of dosage of viscosity reducer - Google Patents
Process for preparing drilling fluid based on control of dosage of viscosity reducer Download PDFInfo
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- CN103045199A CN103045199A CN 201110325936 CN201110325936A CN103045199A CN 103045199 A CN103045199 A CN 103045199A CN 201110325936 CN201110325936 CN 201110325936 CN 201110325936 A CN201110325936 A CN 201110325936A CN 103045199 A CN103045199 A CN 103045199A
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Abstract
The invention discloses a process for preparing a drilling fluid based on controlling dosage of a viscosity reducer. The process comprises the following steps of: (a) preparing sodium bentonite for future use; (b) adding a tackifier PAC-HV and completely dissolving the tackifier PAC-HV; (c) adding a filtrate reducer SMP-2; (d) adding KCl and NaCl; (e) adding a deformation blocking agent FT-1 and a rigidity blocking agent CaCO3; (f) adding 2-4% of viscosity reducer PSC-1; (g) adding TRH-2 so that TRH-2 acts thoroughly; and (h) heating the system and then adding a weighing agent, thereby obtaining the product. The process is capable of successfully preparing the drilling fluid having high temperature resistance and high density by controlling the dosage of the viscosity reducer PSC-1 in the preparation process, and is simple in preparation procedure and easy to operate; the preparation cost of the drilling fluid is reduced, and the prepared drilling fluid system is excellent in performance, thus the requirements for drilling project and reservoir protection are met.
Description
Technical field
The present invention relates to a kind of preparation technology, specifically refer to a kind of drilling fluid preparation technology based on control viscosity-depression agent dosage.
Background technology
Along with the development of World Oil Industry, constantly widen the oil gas drilling developing zone, probing exploitation just gradually by shallow-layer to Deep Development, tectonic structure is increasingly sophisticated, drilling depth constantly increases, and has higher requirement for needed drilling fluid, to satisfy the growing of petroleum industry.
At present, in the Petroleum Exploration in China exploitation, deep-well will be the emphasis of from now on exploratory development.In the drilling operation that bar assorted suddenly district in Xinjiang carries out, because reservoir buries relatively deeply, reservoir pressure changes greatly, complex lithology is changeable, probing is difficulty comparatively, and timeliness is low, and cost is high.Be embodied in: deep-well downhole temperature and pressure are high, complex formation, sometimes bore and meet the ultra-high voltage brine layer, complicated saline bed and cream mud stone, the conventional drilling liquid system is difficult to solve the drilling fluid high solid loading, the filtrate high salinity, unstable properties, filter loss is crossed high technical barrier, Creep of gypsum often occurs in the wellbore construction process, hole instability, easily spray leakiness, the down-hole complex accident such as tight trip and easy bit freezing, simultaneously because salt dissolving in stratum causes hole diameter to enlarge, have a strong impact on wellbore quality, bring great difficulty to oil gas drilling, seriously hamper the oil-gas exploration process; When using high density drilling fluid to creep into, drilling fluid flows, and property is poor, mud cake is thick, filter loss is large, solids removal is difficult, property of drilling fluid is difficult to safeguard; Along with the increase of well depth, ground temperature is more and more higher, and drilling fluid is under the hot conditions of shaft bottom, and the treatment agent degraded is accelerated, and dehydration increases considerably, and causes drilling fluid viscosity to increase or curing, hole instability etc.Simultaneously because the deep formation complicated geology, the problem that deep drilling will run into inevitably many cover pressure series of strata stratum and deposit, how safety is crept into many cover pressure series of strata stratum, carry out the leak-proof leak-stopping of deep formation drilling process, improve Formation bearing pressure, be the key that safety is crept into deep ﹠ ultra-deep well, this has proposed higher requirement to Drilling Fluid Technology.
Deep drilling has proposed challenge not only for existing drilling fluid system; also proposed a lot of new problems for simultaneously the drilling liquid technology of protection hydrocarbon zone; therefore to successfully carry out exploratory development; must there be the drilling liquid technology of high-quality to ensure; require drilling fluid to have: high-temperature stability, good oilness and shear thinning behavior; the low rheological of solid load is good, the high pressure fluid loss is low, the pollution of anti-various solubility salts and sour gas, is conducive to prepare, process, safeguard and alleviate formation contaminant.
The development of China's high temperature resistance Drilling Fluid Technique for Deep technology is broadly divided into calcium treated drilling fluid, sulfonated drilling fluid and sulphonated polymer mud three phases.
(1) calcium treated drilling fluid
Calcium treated drilling fluid is the basic Drilling Fluid Technique for Deep type that China used to early seventies in the sixties, mainly utilize inorganic calcium salt (Ca (OH) 2) or sodium salt (NaCl) to improve hole stability, add in addition feero-chromo-lignosulfonate (FCLS) or coal-alkali reagent (NaC), carboxymethyl cellulose (CMC) and some tensio-active agents etc. are kept the rheological property of drilling fluid.All be to be drilled to merit with this class drilling fluid such as loose Ji Jing (calcium base), east wind 2 wells (calcium base), New Port 57 wells (saline based), Wang Shen 2 wells (saturated salt is water base) etc.
(2) three sulphur drilling fluids
Three sulphur drilling fluids are employed drilling fluid types of the most of deep-wells of China after the seventies, and so-called " three sulphur " namely is sulfonated phenol formaldehyde resin (SMP), sulfonated lignite (SMC) and sulfonation mimosa extract (SMK).These three kinds for the treatment of agents have reduced the high temperature and high pre ssure filtration of drilling fluid effectively, and then improved " hole stability ", Sichuan Petroleum Administration cooperates FCLS, CMC, Ca (OH) 2 and potassium bichromate (K2Cr2O7), tensio-active agent etc. to be drilled to the darkest pass Ji Jing (7175m) of China, women Ji Jing (6011m) with these three kinds for the treatment of agents again.Succeeding in developing of three sulphur drilling fluids, that China is at the technical much progress of Drilling Fluid Technique for Deep, its item key is: these three kinds for the treatment of agents can reduce high temperature and high pre ssure filtration effectively, after particularly adding sulfonated phenol formaldehyde resin, increase along with well depth and pressure reduction, its filter loss increase seldom, sometimes also reduce (and this characteristic is that former calcium treated drilling fluid system is inaccessible), so just greatly hang down and improved mud cake quality, reduce the complexcase such as the bit freezing that caves in of down-hole, improved the success ratio of deep drilling exploration.For example, at 4700～5335m, adding to the bentonite slurry that contains 10%: SMP4%, SMC6%, SP-80 promoting agent 0.3%, AS (alkyl sodium sulfonate) 0.15%, Na when creeping into from dark 1 well (Sichuan)
2Cr
2O
72%, behind the diesel oil 5%, under the 192 ℃ of temperature in shaft bottom, the 23.7ml that its filter loss never adds SMP drops to 9.6ml, frictional coefficient (Kf/45min) 0.07.Through five drillling tool twisting offs, three cementing plugs, bit freezing does not all occur in a percussion drill accident.For China's Drilling Fluid Technique for Deep technology has been started new situation.
(3) the sulphonated polymer mud stage
So-called " sulphonated polymer mud " refers in practice process will " polymer drilling fluid " and " three sulphur drilling fluids " to combine and the class system that forms, at present still widespread use " polymer drilling fluid ", begin to cry " not disperseing low solids polymer drilling fluid ", be at the later stage seventies, the initial stage eighties, utilize propylene phthalein amine organic polymer as the inhibitor of drilling fluid and develop gradually a kind of drilling fluid system that forms in order to promote " jetting drilling technology " and " drilling with optimized parameter technology ".This class drilling fluid is owing to used the organic polymer of long-chain to replace the inorganic salt inhibitor that uses in the former calcium treated drilling fluid, thereby effectively suppressed the pulping on stratum, improve widely hole stability, seen significant effect aspect the raising drilling speed.The product of this class organic polymer is many have been succeeded in developing.From initial non-hydrolysis, partial hydrolysis polypropylene phthalein amine, develop into the composite of large, medium and small molecular weight, derivative or the graft copolymer of different functional groups (calcium, sodium, ammonium salt) and expand vinylsulfonate, vinyl pyrrolidone to and with polymkeric substance of Cationic functional groups etc.
Any treatment agent adds in the drilling fluid, all can dissolve (or swelling, dispersion), has large water gaging absorption (transfers) to treatment agent, forms hydration shell, makes free-water amount minimizing in the drilling fluid system.Simultaneously, the treatment agent that has also can form the space reticulated structure with slope soil, drilling cuttings interaction (adsorption), some water such as reticulated structure that in addition forms between the clay particle itself is " fixed " in grid and is difficult for " escaping ", has also reduced undoubtedly free water content in the system.In addition, if treatment agent is many and mix in the drilling fluid system, not only water is contaminated serious, and serious the variation occurs for the activity of free-water, structure, physicochemical property, and in the system freely the water of activity also reduce.All these situations all can weaken the rheological of high-density water-based drilling fluid system.
In addition, if solid load is very high in the drilling fluid system, the temperature resistance ability for the treatment of agent own and anti-salt, anticalcium ability, therefore treatment agent can lose stress efficacy, the uncontrollable high-density water-based drilling fluid rheological of its result.This just requires in the drilling fluid system treatment agent kind the least possible, and every kind for the treatment of agent should have a kind of special function, and should still can be effective in the situation that environment is changed.In the preparation process of high temperature high density drilling fluid system, determine to use the treatment agent that may lack, and make every kind for the treatment of agent can control separately a kind of performance in the following property of drilling fluid: resistance to crocking, rheological, leak-off and shutoff.
In the preparation process of drilling fluid, there is very large impact in the dosage of flow pattern stablizer to the rheological of the drilling fluid system prepared, and suitable flow pattern stablizer dosage of how to confirm seems particularly important to the preparation of drilling fluid.
Summary of the invention
Purpose of the present invention is in order to overcome the deficiencies in the prior art and defective; a kind of drilling fluid preparation technology based on control viscosity-depression agent dosage is provided; this preparation technology is by the dosage of the flow pattern viscosity-depression agent PSC-1 in the control preparation process; can not only successfully prepare the high temperature high density drilling fluid; and preparation process is simple, and processing ease has reduced the preparation cost of drilling fluid; and the excellent performance of the drilling fluid system of preparing, thereby the needs of drilling engineering and reservoir protection have been satisfied.
Purpose of the present invention is achieved through the following technical solutions: a kind of drilling fluid preparation technology based on control viscosity-depression agent dosage may further comprise the steps:
(a) the quantitative base of configuration is starched for subsequent use;
(b) add tackifier PAC-HV under the high-speed stirring, fully till the dissolving;
(c) PAC-HV slurry is taken off, pour in the reaction vessel, disposable adding fluid loss agent SMP-2 according to quantity then, stirring at low speed allows it fully be adsorbed to balance, reaches to protect the glue purpose;
(d) then according to quantity disposable adding KCl, NaCl, first thickening subtract thickly to stable, and stirring at low speed allows it fully dissolve and acts on;
(e)) plugging agent FT-1 and rigidity plugging agent CaCO are out of shape in disposable adding according to quantity
3, stirring at low speed allows it fully disperse;
(f) disposable adding viscosity-depression agent PSC-1 according to quantity, and the dosage of control viscosity-depression agent PSC-1 is 2%～4%, stirring at low speed 40-60min allows it fully dissolve and adsorbs;
(g) disposable adding TRH-2 according to quantity, stirring at low speed 30min allows it fully act on;
(h) with the system heating, after above treatment agent adds and act on thoroughly, add weighting agent, namely get product.
In the described step (a), the base slurry is sodium bentonite.
In the described step (b), the time of high-speed stirring is 10min.
In the described step (c), the time of stirring at low speed is 40-60min.
In the described step (c), reaction vessel is enamelled cup.
In the described step (h), system is heated to 40 ℃.
In the described step (f), the dosage of control viscosity-depression agent PSC-1 is 3%.
In sum; the invention has the beneficial effects as follows: by the dosage of the viscosity-depression agent PSC-1 in the control preparation process; can not only successfully prepare the high temperature high density drilling fluid; and preparation process is simple; processing ease; reduce the preparation cost of drilling fluid, and the excellent performance of the drilling fluid system of preparing, thereby satisfied the needs of drilling engineering and reservoir protection.
Embodiment
Below in conjunction with embodiment, to the detailed description further of the present invention's do, but embodiments of the present invention are not limited to this.
Embodiment:
Present embodiment relates to a kind of drilling fluid preparation technology based on control viscosity-depression agent dosage, may further comprise the steps:
(a) the quantitative base of configuration is starched for subsequent use;
(b) add tackifier PAC-HV under the high-speed stirring, fully till the dissolving;
(c) PAC-HV slurry is taken off, pour in the reaction vessel, disposable adding fluid loss agent SMP-2 according to quantity then, stirring at low speed allows it fully be adsorbed to balance, reaches to protect the glue purpose;
(d) then according to quantity disposable adding KCl, NaCl, first thickening subtract thickly to stable, and stirring at low speed allows it fully dissolve and acts on;
(e)) plugging agent FT-1 and rigidity plugging agent CaCO are out of shape in disposable adding according to quantity
3, stirring at low speed allows it fully disperse;
(f) disposable adding viscosity-depression agent PSC-1 according to quantity, and the dosage of control viscosity-depression agent PSC-1 is 2%～4%, stirring at low speed 40-60min allows it fully dissolve and adsorbs;
(g) disposable adding TRH-2 according to quantity, stirring at low speed 30min allows it fully act on;
(h) with the system heating, after above treatment agent adds and act on thoroughly, add weighting agent, namely get product.
In the described step (a), the base slurry is sodium bentonite.
In the described step (b), the time of high-speed stirring is 10min.
In the described step (c), the time of stirring at low speed is 40-60min.
In the described step (c), reaction vessel is enamelled cup.
In the described step (h), system is heated to 40 ℃.
In order to obtain the viscosity-depression agent PSC-1 dosage of the best in the preparation process, the present invention has done the impact experiment of viscosity-depression agent PSC-1 on product performance, and experimental result is as shown in the table:
As seen from the above table, the dosage of viscosity-depression agent PSC-1 should be controlled at 2%～4%, and the best is 3%.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction, and any simple modification, the equivalent variations on every foundation technical spirit of the present invention above embodiment done all fall within protection scope of the present invention.
Claims (7)
1. the drilling fluid preparation technology based on control viscosity-depression agent dosage is characterized in that, may further comprise the steps:
(a) the quantitative base of configuration is starched for subsequent use;
(b) add tackifier PAC-HV under the high-speed stirring, fully till the dissolving;
(c) PAC-HV slurry is taken off, pour in the reaction vessel, disposable adding fluid loss agent SMP-2 according to quantity then, stirring at low speed allows it fully be adsorbed to balance, reaches to protect the glue purpose;
(d) then according to quantity disposable adding KCl, NaCl, first thickening subtract thickly to stable, and stirring at low speed allows it fully dissolve and acts on;
(e)) plugging agent FT-1 and rigidity plugging agent CaCO are out of shape in disposable adding according to quantity
3, stirring at low speed allows it fully disperse;
(f) disposable adding viscosity-depression agent PSC-1 according to quantity, and the dosage of control viscosity-depression agent PSC-1 is 2%～4%, stirring at low speed 40-60min allows it fully dissolve and adsorbs;
(g) disposable adding TRH-2 according to quantity, stirring at low speed 30min allows it fully act on;
(h) with the system heating, after above treatment agent adds and act on thoroughly, add weighting agent, namely get product.
2. a kind of drilling fluid preparation technology based on control viscosity-depression agent dosage according to claim 1 is characterized in that, in the described step (a), the base slurry is sodium bentonite.
3. a kind of drilling fluid preparation technology based on control viscosity-depression agent dosage according to claim 1 is characterized in that in the described step (b), the time of high-speed stirring is 10min.
4. a kind of drilling fluid preparation technology based on control viscosity-depression agent dosage according to claim 1 is characterized in that in the described step (c), the time of stirring at low speed is 40-60min.
5. a kind of drilling fluid preparation technology based on control viscosity-depression agent dosage according to claim 1 is characterized in that in the described step (c), reaction vessel is enamelled cup.
6. a kind of drilling fluid preparation technology based on control viscosity-depression agent dosage according to claim 1 is characterized in that, in the described step (h), system is heated to 40 ℃.
7. each described a kind of drilling fluid preparation technology based on control viscosity-depression agent dosage is characterized in that according to claim 1～6, and in the described step (f), the dosage of control viscosity-depression agent PSC-1 is 3%.
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| CN 201110325936 CN103045199A (en) | 2011-10-13 | 2011-10-13 | Process for preparing drilling fluid based on control of dosage of viscosity reducer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106535560A (en) * | 2014-01-26 | 2017-03-22 | 斯迪克新型材料（江苏）有限公司 | Manufacturing process for heat-conducting graphite paste films for flat computers |
| CN109488290A (en) * | 2017-09-12 | 2019-03-19 | 中国石油天然气股份有限公司 | Evaluation method and device for damage degree of drilling fluid to reservoir |
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2011
- 2011-10-13 CN CN 201110325936 patent/CN103045199A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106535560A (en) * | 2014-01-26 | 2017-03-22 | 斯迪克新型材料（江苏）有限公司 | Manufacturing process for heat-conducting graphite paste films for flat computers |
| CN109488290A (en) * | 2017-09-12 | 2019-03-19 | 中国石油天然气股份有限公司 | Evaluation method and device for damage degree of drilling fluid to reservoir |
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Application publication date: 20130417 |