Oil Field Water Flooding Long-term Effective Prevention Swell Technical Research

The clay is stable, low to permeate an important subject thatoil field development faces. In fact, the great majority low oil ,gas-bearing formation that permeate contain clay minerals, they fullof piece clay deposit , come down under depositing function , haveore transform into until heating power , pressure act on for a longtime too, had it when water flows through rock of base , thespontaneous clay was deposited and taken shape. Until mineral thesein oil, angry for producing China importance and they to extensiveinvestigation that penetrance endanger correctly, it is generallyacknowledged that it is two important factors of damaging penetranceof these minerals to swell and transport and move. In the course ofswelling, the clay sucks water in the crystal structure, cause theincrease of the clay volume , thus stop up the stratum narrow passage;In the course of transporting and moving, clay material disperseoutside liquid, for produce liquid carry, form the bridge to hinderor reduce expenditure and click in the hole venturi of the capillary ,then cause the decline of the stratum penetrance.Store the quick general regularity of one layer of water. Enteroutside mineralization and clay mineral to store layer of liquid tostore layer at the time of the compatibility, will cause the clayto swell or transport and move , will lead to the fact that storesone layer of penetrance to reduce. Influencing mainly has a claymineral type to store the quick factor of one layer of water, content ,distributing mineralization , reducing pace of mineralization andcationic composition of the way , outside liquid ,etc.. Common orderof clay mineral impact on water quick intensity is while storinglayer : Covered with and taken off the stone >Iraq deceive peopleone layer of mineral >Illite >Kaolinite >Chlorite. The rock holeoozes property quick influence to water. It is low in absolutepenetrance, the hole throat is stored in layer smaller, even thereis a small amount of water quick clay mineral, quick to water andof great impact. In absolute penetrance high, hole throat storinglayer heavy, contain with low to ooze , store layers of as many watergetting quick clay at the mineral, quick influence to water isrelatively small. Make up it while analyzing in the oil field rock,mainly there are four kinds of common clay minerals, includingkaolinite, covering with and taking off the stone , illite andchlorite.Last 30 the coming years, in order to reduce or prevent clayand particle to the damage of the oil , gas-bearing formation, peoplehave used a lot of chemical methods and technological means. Speakingfrom the essence, what found was covered with mineral of taking offthe stone , kaolinite , illite and mixing the form etc. among theoil , gas-bearing formation, the most common one is the clay witha lot of negative electric charges of surface. Negative electriccharge these have high sensitiveness very to liquid, thesensitiveness to develop most clay stable additive base on mechanism.Clay mineral pack the mineral like hole lining or hole, exist onnatural to pile up or arrange stretch in hole brilliant to inside ,and is surrounded by including salt former raw stratum inkaccidentally, they are usually the salt formed by Na and Ca. The ionabsorbs it on the surface of the clay, play a neutral function onthe anion because of the function of the electric charge, in thiscase, the clay is stable. Deal with the liquid or not produce onelayer of water as the low oil well including salt quantity when theliquid of outside enters the stratum , have played the functiondiluting on the original unboiled water, and has reduced the densityof the salt among them . When the cation covered on the surface ofclay is spread , the moisture son flows fast in the clay crystal,lead to the fact , cover with , take off stone and some mixing typeclay happen , swell, kaolinite , illite , chlorite and mix rockstratum ,etc. crush. In most areas, the damage of this kind isirreversible, need to acidify treatment, remove and stop up things .On the basis of storing floor and outside fluid compatibilityand appraisal of sensitiveness in the room, and trends(drill coreflow) experiment compare and analyse and appraise to 8 claycomprehensive performance of stabilizer through static behavior(alta-mud powder at odds with the community or the leadership , drillcore particle weightlessness). Consider in oil field actualproduction , stratum cleaner quarry oil well stratum go on , wash ,solve daily oil field chemical auxiliary that stop up to waterflooding, so launch clay stabilizer and wash oil compatibilityexperiment of pharmaceutical, excellent to elect with Daqing oilfield actual oil reservoir looks long-efficiency clay stabilizer ofcompatibility, so as to form , defend technology of expanding fromindoor experiment long-efficiency water flooding employed to go.To a concrete oil field , will often not carried on optimumseeking to clay stabilizer or used at will , and it is improper tocause the consumption of a lot of clay stabilizer , usage , causethe on-the-spot result of use to be bad, can't defend the purposeto expand , even make the oil reservoir injured , reduce the oil fielddevelopment result. And except field such as being synthetic ofstabilizer utilize X ray diffraction appearance micro quantitativeappraisal defend , expand result sometimes in clay at present, inprevent from , expand liquid to be department excellent to choose ,adopt a traditional one getting at odds with the community or theleadership to appraise clay quality of stabilizer generally,calculate and defend the expanding rate by determining the alta-mudpowder volume expansion increment in clay stabilizer solution andfresh water. This research, with needing to choose 8 kinds ofdifferent kinds of clay stabilizers according to the characteristicsof oil field of Zhaoyuan, determine using at odds with the communityor the leadership law , prevent from person who expand and drill coreparticle static behavior weightless law determine way to dissolvelosing rate screen clay stabilizer and employ the densitytentatively.In the evaluation index of clay stabilizer, it is the biggerto defend the expanding rate, it is the lighter to dissolve the losingrate, the ones that show clay stabilizer defend expanding performanceis the better. Static experimental evaluation result reveal , preventfrom , swell ability strong KCl , NH4Cl ,etc. inorganic salts preventfrom , expand pharmaceutical compare, it is 6 kinds of other claystabilizer China and Thailand can, defend it expands that result isbest at member cation and macromolecule cations little, employdensity when 3.0 more than , prevent person who expand from valuecan up to about 85.0 , dissolve person who lose it reduces to be 0.68about, embody their inhibit ink ability to swell clay from , alsodisplay certain preventing the particle from transporting theperformance of moving. Certainly,about experiments static it is thesafe in that screen can, molecule cation and macromolecule cationslight, must drive for the further optimum seeking of the experimentthrough the drill core , confirm the rational parameter of runninginto.In oil field production, stratum cleaner to recover the oil,note stratum go on , wash , solve chemical auxiliary of oil fieldstopped up around the well. If can wash the stratum before injectingclay stabilizer into, will inevitablely strengthen the applicationresult of clay stabilizer . Because of the difference betweenproperty , the stratum condition of cleaner, different applicationresults in the oil field of cleaner are different, for this reasonin screen long-efficiency to defend , expand liquid at the foundationof department , launch clay stabilizer and wash oil compatibilitynature experiment of pharmaceutical, think scene produce , offerexperiment basis actually.The sensitiveness experimental result shows , Zhaoyuan oilfield store layer have speed to be quick, have medium-sized waterquick characteristic , cause note water pressure strength rise , thepermeability is reduced. Utilize at odds with the community or theleadership , weightlessness ,etc. traditional method and simulationwater flooding drill core of course flow experiment carry on low topermeate oil field clay optimum seeking of stabilizer, science isrational , the effectiveness is strong. Use little clay stabilizerof molecular weight to low to permeate whom oil reservoir defendexpanding effectual, and big clay stabilizer of molecular weight stopup can to low to permeate oil reservoir lead to the fact sure injury.Screen the experiment and think , small molecules cation claystabilizers and strata are good in compatibility through a seriesof, prevent from , expand result prominent(whether defend 84.6 ofexpanding etc., dissolve 0.681 of losing etc.), store layers ofpenetrance ascensional range above 20% employ ,, and the term ofvalidity is long. Small molecule cation clay stabilizer andperformance good stratum cleaner reply and worthy of using, can makenote water pressure strength get effective control , can reach withpreventing from , expanding department's about equal preventing theresult of expanding from of the liquid alone on terms that there islittle consumption too. The system is that the ones that are suitablefor the oil field of Zhaoyuan defend expanding long-efficiencily:Daqing city red great prosperity metal surface , district of hillock ,deal with the light molecule cation clay stabilizer that the factoryproduced, employ the density to be 3.0, the best consumption is forabout 5PV, can guarantee the long-efficiency water flooding cycleof 50PV , propose replying and worthy of using with stratum cleaner.