CN103048218A - Testing method of depositing stability of drilling fluid - Google Patents
Testing method of depositing stability of drilling fluid Download PDFInfo
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- CN103048218A CN103048218A CN 201110326335 CN201110326335A CN103048218A CN 103048218 A CN103048218 A CN 103048218A CN 201110326335 CN201110326335 CN 201110326335 CN 201110326335 A CN201110326335 A CN 201110326335A CN 103048218 A CN103048218 A CN 103048218A
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Abstract
The invention discloses a testing method of the depositing stability of drilling fluid. The testing method comprises the following steps: (a) preparing the drilling fluid for future use; (b) uniformly agitating the drilling fluid and pouring into an experiment container until the drilling fluid reaches a full scale; standing for a certain time; and (c), taking the drilling fluid at a 2/5 part and determining the density of the drilling fluid of the upper layer through a tool and taking the drilling fluid at a 4/5 part; and determining the density of the drilling fluid of the lower layer through the tool, wherein according to a tested result, if an upper-lower density difference value of a drilling fluid system in a measuring cylinder is zero and no water separation phenomenon exits, the depositing stability is good. According to the testing method disclosed by the invention, the depositing stability of the drilling fluid can be rapidly determined; and the tested result is accurate, the testing step is simple and the testing cost is greatly reduced.
Description
Technical field
The present invention relates to a kind of method of testing, specifically refer to a kind of method of testing of sedimentation stability of drilling fluid.
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 UHV (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 treating 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 lubricity 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 surfactants 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 dichromate (K2Cr2O7), surfactant etc. to be drilled to the darkest pass Ji Jing (7175m) of China, women Ji Jing (60llm) 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 outstanding feature 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 complex situations 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 activating 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, friction factor (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 having used the organic polymer of long-chain to replace the inorganic salts 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 bit 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, derivant 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 treating agent adds in the drilling fluid, all can dissolve (or swelling, dispersion), has large water gaging absorption (transfers) to treating agent, forms hydration shell, makes free water amount minimizing in the drilling fluid system.Simultaneously, some treating agents also can form the space reticulate texture with slope soil, drilling cuttings interaction (suction-operated), some water such as reticulate texture 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 treating 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 treating 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 treating agent kind the least possible, and every kind for the treatment of agent should have a kind of special function, and should in the situation that environment is changed still can be effective.In the preparation process of high temperature high density drilling fluid system, determine to use the treating 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 tocrocking, rheological, leak-off and shutoff.
Sedimentation stability is very important in a drilling fluid performance parameters parameter, how to test out fast and accurately the sedimentation stability of drilling fluid, seems particularly important.
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 method of testing of sedimentation stability of drilling fluid is provided, and this method of testing energy Quick Measuring is made the sedimentation stability of drilling fluid, and test result is accurate, testing procedure is simple, greatly reduces testing cost.
Purpose of the present invention is achieved through the following technical solutions: a kind of method of testing of sedimentation stability of drilling fluid may further comprise the steps:
(a) the configuration drilling fluid is for subsequent use;
(b) drilling fluid is stirred evenly, pour in the experiment container to full scale, leave standstill certain hour;
(c) get 2/5 place's drilling fluid, measure the upper strata drilling fluid density by instrument, get 4/5 place's drilling fluid, measure lower floor's drilling fluid density by instrument, according to measurement result, the difference of densities value that ties up in the graduated cylinder such as wellbore fluid is zero, and without the bleed phenomenon, show that then sedimentation stability is good.
In the described step (b), experiment container is the 500ml graduated cylinder.
In the described step (b), time of repose is 48h.
In the described step (c), tools for measurement is that density claims.
In sum, the invention has the beneficial effects as follows: the energy Quick Measuring is made the sedimentation stability of drilling fluid, and test result is accurate, and testing procedure is simple, greatly reduces testing cost.
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:
The present embodiment relates to a kind of method of testing of sedimentation stability of drilling fluid, may further comprise the steps:
(a) the configuration drilling fluid is for subsequent use;
(b) drilling fluid is stirred evenly, pour in the experiment container to full scale, leave standstill certain hour;
(c) get 2/5 place's drilling fluid, measure the upper strata drilling fluid density by instrument, get 4/5 place's drilling fluid, measure lower floor's drilling fluid density by instrument, according to measurement result, the difference of densities value that ties up in the graduated cylinder such as wellbore fluid is zero, and without the bleed phenomenon, show that then sedimentation stability is good.
In the described step (b), experiment container is the 500ml graduated cylinder.
In the described step (b), time of repose is 48h.
In the described step (c), tools for measurement is that density claims.
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 (4)
1. the method for testing of the sedimentation stability of a drilling fluid is characterized in that, may further comprise the steps:
(a) the configuration drilling fluid is for subsequent use;
(b) drilling fluid is stirred evenly, pour in the experiment container to full scale, leave standstill certain hour;
(c) get 2/5 place's drilling fluid, measure the upper strata drilling fluid density by instrument, get 4/5 place's drilling fluid, measure lower floor's drilling fluid density by instrument, according to measurement result, the difference of densities value that ties up in the graduated cylinder such as wellbore fluid is zero, and without the bleed phenomenon, show that then sedimentation stability is good.
2. the method for testing of the sedimentation stability of a kind of drilling fluid according to claim 1 is characterized in that, in the described step (b), experiment container is the 500ml graduated cylinder.
3. the method for testing of the sedimentation stability of a kind of drilling fluid according to claim 1 is characterized in that, in the described step (b), time of repose is 48h.
4. the method for testing of the sedimentation stability of a kind of drilling fluid according to claim 1 is characterized in that, in the described step (c), tools for measurement is that density claims.
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| CN 201110326335 CN103048218A (en) | 2011-10-13 | 2011-10-13 | Testing method of depositing stability of drilling fluid |
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| CN 201110326335 CN103048218A (en) | 2011-10-13 | 2011-10-13 | Testing method of depositing stability of drilling fluid |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104515717A (en) * | 2013-09-27 | 2015-04-15 | 中国石油化工集团公司 | Drilling fluid settleability testing device |
| CN105043931A (en) * | 2015-07-13 | 2015-11-11 | 中国石油集团渤海钻探工程有限公司 | Method for measuring settlement stability of pad fluid or post-pad fluid for well cementation |
| CN105445418A (en) * | 2014-09-27 | 2016-03-30 | 中国石油化工集团公司 | Drilling fluid stability test method |
| CN106646277A (en) * | 2015-10-30 | 2017-05-10 | 中石化石油工程技术服务有限公司 | Drilling fluid sedimentary stability evaluation device and method |
| CN111380826A (en) * | 2018-12-27 | 2020-07-07 | 中国石油天然气股份有限公司 | Method and device for detecting drilling fluid performance |
-
2011
- 2011-10-13 CN CN 201110326335 patent/CN103048218A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104515717A (en) * | 2013-09-27 | 2015-04-15 | 中国石油化工集团公司 | Drilling fluid settleability testing device |
| CN105445418A (en) * | 2014-09-27 | 2016-03-30 | 中国石油化工集团公司 | Drilling fluid stability test method |
| CN105043931A (en) * | 2015-07-13 | 2015-11-11 | 中国石油集团渤海钻探工程有限公司 | Method for measuring settlement stability of pad fluid or post-pad fluid for well cementation |
| CN106646277A (en) * | 2015-10-30 | 2017-05-10 | 中石化石油工程技术服务有限公司 | Drilling fluid sedimentary stability evaluation device and method |
| CN111380826A (en) * | 2018-12-27 | 2020-07-07 | 中国石油天然气股份有限公司 | Method and device for detecting drilling fluid performance |
| CN111380826B (en) * | 2018-12-27 | 2022-12-02 | 中国石油天然气股份有限公司 | Method and device for detecting drilling fluid performance |
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Application publication date: 20130417 |