The Special Treatment Of Water Injection Wells in Northwest Oilfield Has Achieved Remarkable Results

Since the beginning of this year, faced with the actual situation of increasing inefficient and ineffective water injection wells, the Third Oil Production Plant of Northwest Oilfield has actively organized and carried out geological control system investigation and diagnosis, and further clarified three types of geological reasons and the production status of reserves. "Increase the scale and increase the pressure" comprehensively carried out the special treatment of carbonate rock water injection, further improved the production degree of water flooding reserves, and achieved good results. Up to now, 28 wells have been implemented, and the daily oil increase has increased from 710 tons to 770 tons. More than 39,000 tons of oil.

For water injection wells with good well-reservoir relationship and good displacement space conditions, the water injection mainly acts on the fracture-cave bodies near the well, while it is difficult to produce the related fracture-cave bodies at the far end. For wells with prominent injection-production contradictions, technicians mainly increase the water injection scale and expand the water injection sweep in the body, so as to fully utilize the fracture-cave bodies near the well. A total of 17 such oil wells have been carried out, and the average water injection scale of a single well has increased from 7,202 cubic meters to 15,777 cubic meters, increasing the daily oil production capacity by 18 tons.

Technicians found in geological analysis that some well-reservoir relationships are good, but the near-wellbore displacement space conditions are poor, and some related fracture-vuggy bodies are relatively close. Such wells have the potential to be able to produce distal fracture-cavity bodies. By increasing the water injection displacement and increasing the lateral sweep range, the technicians can effectively reach the distal fracture-cavity body. Up to now, 7 wells have been implemented, the average single well water injection displacement has increased from 284 cubic meters per day to 490 cubic meters per day, and the daily oil production capacity has been increased by 32 tons.

For water injection wells with poor well-reservoir relationship, poor displaceable space conditions, basically ineffective water injection, and undeveloped near and far ends, and prominent storage-production contradictions, technicians achieved the purpose of fracture expansion and communication by implementing acidification + water injection. Two wells have been implemented, effectively improving the production conditions of the reserves and increasing the daily oil production capacity by 10 tons.

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