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Horizontal Well Sectional Frac Technique with Dual-Retrievable Packers in Daqing Oilfield
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Abstract
Horizontal well technology is a technological revolution in oil industry, and it is one of the most important methods of thick layer sustainable production and marginal low permeable formation exploitation in Daqing Oilfield. It is commonly believed that fracturing is an effective way to recover oil from thin, low porosity and low permeability sands. However, the existing frac technique in the horizontal wells - the limited entry frac is a kind of commingled frac method that cannot guarantee the fractures' opening and extension uniformly owing to heterogeneity formation. A novel sectional frac technique with dual-retrievable packers by separately stimulating the specific intervals one by one has been developed to recover low permeable reservoirs in the horizontal wells. Sectional frac string chosen includes high pressure, high temperature tools which have been used in several wells application as well as long term tested in a laboratory environment to differential pressures of 7300 psi at 190 ° F with functions of stuck-preventing, stuck-releasing and reverse sand flushing. Five intervals treatment can be done in one trip.
Up to now, this technique has been applied on 55 horizontal wells in Daqing Oilfield and 281 intervals were fractured in the field. It usually takes one to three days to frac a horizontal well according to the numbers of target reservoirs. The initial oil production after using the sectional frac technique in horizontal wells is 5.7 times higher than that in vertical wells, and 1.04 times higher than that by using the limited entry frac technique in horizontal wells. The current oil production after using the sectional frac technique in horizontal wells is 4.3 times higher than that in vertical wells, and 1.72 times higher than that by using the limited entry frac technique in horizontal wells. Field runs and lab testing have confirmed that sectional frac technique is a viable option in recovering low permeable reservoirs in the horizontal wells.
Title: Horizontal Well Sectional Frac Technique with Dual-Retrievable Packers in Daqing Oilfield
Description:
Abstract
Horizontal well technology is a technological revolution in oil industry, and it is one of the most important methods of thick layer sustainable production and marginal low permeable formation exploitation in Daqing Oilfield.
It is commonly believed that fracturing is an effective way to recover oil from thin, low porosity and low permeability sands.
However, the existing frac technique in the horizontal wells - the limited entry frac is a kind of commingled frac method that cannot guarantee the fractures' opening and extension uniformly owing to heterogeneity formation.
A novel sectional frac technique with dual-retrievable packers by separately stimulating the specific intervals one by one has been developed to recover low permeable reservoirs in the horizontal wells.
Sectional frac string chosen includes high pressure, high temperature tools which have been used in several wells application as well as long term tested in a laboratory environment to differential pressures of 7300 psi at 190 ° F with functions of stuck-preventing, stuck-releasing and reverse sand flushing.
Five intervals treatment can be done in one trip.
Up to now, this technique has been applied on 55 horizontal wells in Daqing Oilfield and 281 intervals were fractured in the field.
It usually takes one to three days to frac a horizontal well according to the numbers of target reservoirs.
The initial oil production after using the sectional frac technique in horizontal wells is 5.
7 times higher than that in vertical wells, and 1.
04 times higher than that by using the limited entry frac technique in horizontal wells.
The current oil production after using the sectional frac technique in horizontal wells is 4.
3 times higher than that in vertical wells, and 1.
72 times higher than that by using the limited entry frac technique in horizontal wells.
Field runs and lab testing have confirmed that sectional frac technique is a viable option in recovering low permeable reservoirs in the horizontal wells.
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