During the middle period of oil field water injection development, due to water drive response influence, the principal stress directional well in the well pattern is exploited successfully, but the lateral well waterflood response is poor. The remaining oil producing reserves is large. After statistical analysis, in the low yield and low efficiency wells distribution, the number of lateral wells increase gradually. For such kind of well, it is usually adopted repeated fracturing technology to improve per well production of the low yield and low efficiency wells. Adopted repeated sand fracturing technology, only increase the crack extension based on the original old crack, adding new fracture drainage area is limited, measures yield increase is a small improve and period is short. Volume fracturing in recent years can satisfy multiple crack fracturing, but the cost is relatively high, the demanded amount for equipment is large, meet the number of selecting well is limited, moreover put forward the higher requirements to the late stage of water injection development.
A series of water soluble and oil soluble Multi-fissured diverting agents are independently developed by our company, combined with the products and matching techniques, through the seam booster force the natural microcracks and branch cracks to open, the multiple cracks system of main crack and a plurality of natural microcracks or branch cracks combined is formed, therefore the Multi-crack fracturing technology is also produced, it achieve the purpose of "deep penetration, full sand filling, less damage, faster flowback", advanced technology, yield enhancement effect is obvious, effective period is long. The technology requires no special construction tools, without special treatment after fracturing, automatic discharge, less dosage and good economic benefits. The technology in the domestic oil field's applications are more than 50 well times, and has obvious yield-increasing effect.
Characteristics:
①Improve the fracturing effect is obvious, increase the probability of generating Multi-crack
②Well selection conditions are relatively widespread, the number of low yield and low efficiency Multi-crack reconstruction measurement wells are increase.
③Product is automatically discharged after fracturing, does not affect the reservoir damage.
④Product dosage is small, no need special equipment, construction is convenient, the operability is strong.
⑤The regional overall recovery efficiency is improved, and the economic benefit has increased significantly.
Centrealoil