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Technology of applied electrochemistry pretreatment prevents dirty of knot of su
From;    Author:Stand originally
One foreword in recent years, the research that people defends oil field dirty to research a field is centered in the growth of action of even to the blame of dirty content nucleate and dirty content in surface of metallic pipe fitting mainly (stick together) between on the relation of interaction, and grow to even nucleate action and the dirty content that facilitate because of noumenon solution the correlation between gives no longer attention. The to even nucleate action research on the tradition is in industrial standard try bottle (Jar) kind undertake in the experiment, the purpose is the performance that evaluates the agent that prevent dirty. The growth of action of even to be not nucleate and dirty content is interested in people, because people thinks the stick together of dirty content compares the large area of dirty content,be even deposit is more serious. Reduce the stick together of dirty content, is not to add the agent that prevent dirty in great quantities, measure of this kind of technology can reduce the risk that the knot inside certain production area dirties, inside the area that touchs hard in the measure that prevent dirty, perhaps be in the complex oil deposit with the exorbitant fee that repair a well, the action of measure of this kind of technology is highlighted particularly. The test of lab chemistry function that produce an environment in the light of oil field and has tries bottle of test besides groovy static state besides, the experiment that changing deposit of content of metallic surface dirty to test technology at present studies, dynamic test uses character tubal block at oil field to produce the alternative that the agent dirties to preventing below the condition normally, also use at detecting to prevent dirty agent to prevent dirty content to be accumulated in small hole coil sometimes add with growth ability. Try bottle of test than convention, these tests can give out to prevent dirty agent character differently to choose in order to offer, press actor bad sort. Different and main body checks detention time in trends now shorter (it is LOs only, and the detention time of groovy experiment trying bottle is as long as 2 ~ 24h) ; Certain kind of agent that prevent dirty have dispersive agent and the integral performance that fight coagulant; Nucleate action and crystal grow impedance effect is with dirty content on tube wall of small hole vitta there is difference between the effect of stick together. 2, the studies working near future undertakes research work of the near future makes clear, although prevent dirty agent to have certain inhibition to a large number of deposit of dirty content, but on the other hand it however aggravate dirty content is in metallic surface stick together and growth degree. The oxygen on electrode of assess of applied electrochemistry method is reductive the rate of reaction, but to the metal apparently dirty content deposit undertakes monitoring. The technology that there is development perspective in application still includes examination of the microscope below the well, quartz crystal microbalance and law of electrochemistry impedance spectrum. The exterior deposit in dirty content and in the research that prevent dirty, the effect that the key studies to prevent dirty agent to rise in place of surface of metallic pipe fitting. A lot of polymer prevent dirty agent to be had reduce the effect that corrodes rate, because they are adsorptive,this is in metallic surface, restrained this thereby apparently corrode an activity. Controlling the mechanism that dirty content grows is the agent that prevent dirty can adsorption grows in dirty content inside area. In the metal to can becoming velar antiseptic apparently adsorption also undertook experimenting study, the result shows this kind of antiseptic has the effect that prevents dirty content stick together. 3, the lab experiments 1, the dose that prevent dirty is right vitriolic barium (the action of content of BaSO) dirty experiments this kind to include groovy static state or try bottle kind check of the effect that prevent dirty, experimenting commonly the suspension in solution is able to bear or endure corrode, be able to bear or endure nickel radical alloy (Hastelloy) lacing film, and make lacing film is in rotate condition. The experiment is below 2 temperature of 20cI and laminar flow condition undertake, experiment solution is the mixed liquor of water of layer of Forties oil field and brine, mix deserve to compare for 90: 10. The experiment is medium phosphorous radical gets together hydroxide is acerbity (PPCA) prevents dirty agent the article is to be published in Ga of Metal of ∞ of the AnAssessment OfAdhesion OfScale AndElectrochemicalPretreatmentforthePreventionScaleDeposition on SPE74676 the essentials of one article, interested reader can consult further accordingly. Concentration is higher, the stick together of BaSO dirty content of only thimbleful is on lacing film. As action of the agent that prevent dirty abate, stick together of partial dirty content happens inside the detention time of 22h. When low PPCA chroma, content of dirty of the BaSO below laminar flow condition in metallic lacing film apparently stick together compares turbulence condition to fall more serious. Below condition of chroma of the small dose that prevent dirty the stick together of dirty content measures the stick together that prevents dirty to handle lacing film to go up than undertaking the volume is a lot of higher. Inside the detention time of the 22h below laminar flow condition, the dirty content of surface of the lacing film below Lppm and 4ppm PPCA condition enclothes a quantity to be respectively 6. 65mg and 0. 42mg BaSO, and the BaSO dirty matter that did not handle lacing film to go up quite to it enclothes a quantity to be 1. 36rag. Below laminar flow condition, did not process metallic lacing film apparently the configuration of formation deposit combines a form for cube and lozenge, dimension is in 2h is inside detention time 1, 2. 5 M. Inside 25h detention time, dirty content writtens guarantee crystal has same figure, but the dimension of body of crystallization of individual dirty content is 1 ~ 5 M, form a kind of compact each other layer. The configuration with dirty right now sedimentary content is cube about, but sedimentary mix in side side stratification form round part. Body of crystallization of individual dirty content is more than apparently taking the dirty matter that observes below condition of the measure that prevent dirty crystallization body, the average size after 22h is more than 101xm. 2. Electrochemistry pretreatment (electrode of type of dial of stainless steel of application of deposit of 1) dirty content (RDE) regards dirty content as deposit surface. Two important experiment level are: Undertake pretreatment to RDE surface; Undertake content deposit experiments dirtying, will evaluate pretreatment effect. The RDE in the solution of 5g / L NaCl that is LO in PH value rotates with the speed of 600r / Min, PPCA is contained to prevent dirty agent in solution, through Calomel Electrode of saturation of opposite of 3 electrode test facilities (SCE) brings to bear on 2min of one LV voltage. Distilled water was used to undertake to electrode full is handled before undertaking content deposit experiments dirtying. Experiment of dirty content deposit is being filled have supersaturation calcium carbonate (CaCO) solution (the agitate in the container that PH value is 9) undertakes, course electrochemistry pretreatment and the RDE lacing film without electrochemistry pretreatment immersion is in this solution 2h. (2) test result is not undertaking the condition of electrochemistry pretreatment falls, stainless steel electrode produces many dirty content deposit inside the immersion time of 2h, formation dirty content writtens guarantee crystal is cube, dimension is normally 10, 201~m. Through scanning lens the analysis can see clearly, consult with what did not undertake electrochemistry is handled test specimen photograph is compared, the deposition of its dirty content reduces the sample that undertook pretreatment below condition of Mg ion existence apparently. When the agent that prevent dirty exists with Mg, the action preventing dirty of pretreatment is optimal. If be in,pretreatment undertakes in containing Ca and the solution that do not contain the agent that prevent dirty, of dirty content deposition reduce be very little. The deposition that adds the agent that prevent dirty to be able to reduce dirty content in pretreatment process (did not add the agent that prevent dirty to consult together sample photograph compares) , but the effect that the effect preventing dirty of pretreatment plays pretreatment as condition of existence Mg2 ion is good. Below the requirement that added Ca and Mg ion in using the agent that prevent dirty and pretreatment process, obtained the better result that prevent dirty. Result of this kind of test makes clear, the stick together that the existence of Mg2 ion made the agent that prevent dirty and sample appearance and the deposit that form the more effective film that prevent dirty to prevent dirty thing. The experiment reached mechanism of two kinds of stick together. The first kind of mechanism is the acrylic salt that decomposes on PPCA a kind of electrostatic cation arises between luscious group and adsorptive diatomic cation the bridge is received. 2 rank cation adsorption forms a kind of very strong surface positive electrical charge, and the acerbity root that decompose produces bind with its. The 2nd kind of mechanism is, below the circumstance that exists in Mg2 ion, can be in electrode apparently form helium of a kind of hydrogen to convert magnesian film. Be in about PPCA electrode apparently the electrochemistry adsorption mechanism that happen is undertaking deep person studies at present. 4, conclusion (1)BaSO4 in metallic lacing film apparently deposition wants to fall to be gotten greatly than turbulence condition below laminar flow condition much. (If 2) prevents the concentration of dirty agent under chroma of the smallest dose that prevent dirty, the stick together that PPCA can make dirty thing and grow. (3) undertakes to metallic RDE lacing film electrochemistry pretreatment can prevent lacing film effectively apparently the formation of CaCO dirty content. (The presence that 4) is having ion of the Mg in electrochemistry pretreatment process can reduce knot dirty apparently to measure, it is better to if PPCA exists,prevent dirty effect.

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