oil well fracturing enables increased production, but the oil well oil production in the entire process of comprehensive reflection, therefore, in the daily management of the oil well, oil well working system selection is reasonable, the right to choose whether other process measures, which have a direct impact oil well production, the impact of fracturing effect.
oil well after fracturing, oil reservoir conditions have been major changes, oil well management must adapt to this new situation.
1.Take the whole, the data fetch prospective oil well production, strengthening oil well observed, a comprehensive analysis on a regular basis.
oil well production process of the data, is based on a comprehensive analysis of oil well and must take regular management system in accordance with the whole field, take quasi-hierarchical production control parameters and test data, strengthening the oil well observed, do not easily let go any new changes, in conjunction with adjacent wells and energy supply wells (injection wells) production status periodically conduct a comprehensive analysis, timely measures opinions oil well management, improve Fractured well managed.
2. open wells fracturing fluid discharged promptly after fracturing
After a period of pressure after fracturing diffusion, balancing process, it should be open wells shut-in production and reduce the construction time for the job, so it is conducive to the timely discharge of fracturing fluid into the reservoir, so that the normal production of oil well.
3.Choose a reasonable working system oilwell
After the oil well fracturing, the relationship between oil and oil changes, oil well production situation has changed, and the same glib comparison before fracturing, the general rule is: to increase daily oil production, see the well water content decreased, tubing pressure flow pressure rise, production pressure reduced, increasing the productivity index. This is the case, open wells after fracturing early production, the production of pressure can not be too large to prevent sand (proppant) back, buried reservoir (the wellbore), sidewall seam closed, affecting the oil. Therefore, it is best to basically maintain oil well fracturing under pressure production pre-production and is scheduled butterfly sampling was conducted to analyze the amount of oil sand, oil well identified oil sand is sand or sand fracturing, after a period of time to ask the production, sand content proved stable (compared to the past), but also the potential of the reservoir itself, this time according to the specific conditions of oil well, the appropriate amplification (or reduce) the production of pressure production, increase the amount of oil, oil play potential, must not chart moment of high yield, uncontrolled amplification production pressure.
4.Not easy to kill
After fracturing has normal production of oil well to be another job, can not easily adopt any killing hydraulic Well, if the killing had to use the technology, the performance of kill fluid to be highly selective, have acid after killing processing, eliminate or reduce damage control fluid to the reservoir, especially for vulnerable crack damage control fluid effects.
5.Comprehensive measures to strengthen the oil well
Oil well after fracturing can yield, yield large or small, successful fracturing construction or not there is a direct relationship, but it does not make a single fracturing measure various types of oil well can get good results, should "because Wells system should "develop a comprehensive measure.
(1) High-containing wells fracturing want with stratification proration, chemical water shutoff combined.
Waterflood oil reservoir heterogeneity and more, due to the high pressure of the aquifer is high, liquid volume production, inhibiting the action of other reservoir. If after fracturing of high aquifer without proper control is not the role of fracturing layers, oil well will not yield, these wells in order to see the ideal fracturing effect before fracturing of high aquifer first chemical water shutoff, then fracturing, or after fracturing stratified proration, blocked or control production capacity of high aquifer that fracturing layer from high aquifer interference, aggressive play its due role, oil well can get better yield.
(2) low-yielding wells, thick oil well fracturing should be combined with mechanical and electric paraffin oil.
Low productivity, poor physical properties of crude oil well, after fracturing often difficult due to production management, fracturing effect will not last long, though early to see some increase in production, but oil production capacity decreased, but improve since fracturing oil reservoir conditions can not change the physical properties of crude oil. It should be used after the high oil viscosity of oil well fracturing electric wax or other measures to reduce the viscosity of crude oil, improve oil flow in the wellbore flow conditions, full fracturing effect effect, after fracturing capacity is still relatively low oil well, early though burping can produce the best or the use of mechanical recovery.
(3) after fracturing the formation of energy supply must be increased.
After the oil well fracturing increase the length of time depends on the formation of energy supplies.
After a substantial increase in oil well fracturing out of fuel, energy consumption increased formation, usually within six months after fracturing a large range of oil well stimulation, production decline soon after it has gradually stabilized at a level sufficient if the formation energy, oil well stable time long, whereas fracturing stimulation time is short.
Heterogeneity and multiple layers of oil, the inter-layer interference is always present, the water level of the wells are relatively well-developed oil layer, fracturing the reservoir is some difference, but after the oil well fracturing wells so that the entire production pressure reduced, So good reservoir oil production fell, fracturing layer of oil production rise, because oil is also a good water injection wells, less poor water reservoir, a sharp increase in oil production after fracturing layer of oil well fracturing, water injection wells often can not meet the requirements, so , after a period of production, good reservoir oil production will gradually rise to the status before fracturing, fracturing layer drops to the level before fracturing, oil well stimulation period is over. If the fracturing injection interval corresponding section layer after alignment by injection or take effective measures to maintain the note, mining balance, better energy supply, fracturing layer can be maintained for a longer period of stimulation.
Conversely, if the energy supply can not meet the needs of long-term oil well, the formation pressure continues to fall even lower than the saturation pressure of the oil layer, this case is driven by a hydraulic drive into a dissolved gas, changing the drive, do not help to improve the exploitation of results .
Seen from the above analysis, oil well fracturing after management is one of the measures of long-term high-yield oil well, while the effect of fracturing has a direct relationship, so the oil well fracturing, in the new production, must be new provisions manage oil well, oil well make a good oil and more oil.