Research And Application Of Increasing Production Technology Of Permian Marine Carbonate Reservoir In Jiulongshan Area

Jiulong Mountain Permian marine carbonate reservoir has a high temperature, high pressure, deeply buried natural fractures, heterogeneity, and other characteristics, the presence of acid rock reservoir stimulation reaction speed, acid fluid loss volume, acid effective distance restrictions and other issues, as well as near-wellbore blockage leading to the initial squeeze pollution problems, construction string length, string friction is high, construction emission restrictions and other technical difficulties. Based on the Jiulong Mountain region Permian marine carbonate reservoir reconstruction difficulties in analysis, analysis and evaluation of different acidified/acid fracturing technology, directional wells acid fracturing technology, the formation of the adaptation to the Jiulong Mountain Permian marine carbonate reservoir stimulation transformation technology. Achieved the following results:1. For Permian carbonate reservoir reconstruction difficulties, should be to increase the acid reservoir stimulation effective distance, forming etched fracture conductivity is higher general principles of design; Use high temperature, with better performance retarder and acid resistance reduction system; using the high intensity with acid to maximize construction emissions.2. Different acidified/acid fracturing process adaptability analysis showed that different reservoir characteristics of Permian should choose a different transformation processes. For good porosity and permeability, fractured reservoirs, recommended gelled acid fracturing process to lift the injury, the formation of cracks in the high conductivity of acid etching; For more developed reservoir fractures, porosity and permeability reservoirs in general, this type of reservoir recommended gelled acid system, the use of pre-pressure liquid+gelling sour acid fracturing technology, and recommended the use of a closed acid fracturing process improving near-wellbore fracture conductivity of acid etching; Poor reservoir porosity and permeability, fracture due to development, it is recommended to select resistance reduction gelled acid system or aggravate acid system, and the use of multi-stage acid fracturing process alternate injection.3. According to reservoir conditions and wellbore conditions, through the optimization calculation, using φ88.9mm completion string construction, the use of the test string to complete a trip perforation, acidification/acid fracturing, testing, gas lift drainage and other operations, help saving oil test time and reduce the cost of test oil.4. According to the reservoir characteristics of Long004-X1well,this paper presents the reservoir rehabilitation programs based on φ88.9mm combination with (p73.0mm tubing,multi-level alternate injection of acid fracturing, construction displacement3.5m3/min, injection of acid strength8-10m3/m. Through on-site implementation, after acid fracturing the well test yields111.65×104m3/d, reservoir stimulation is better.It has important significance for guiding the design of stimulation of Jiulong Mountain Permian marine carbonate reservoir, and improving the success rate of the construction of reservoir fracturing and acidizing and fracturing effect.To some extent,contributed to the carbonate reservoir acid fracturing treatment theory and technological progress.