King Oil Field 37 Development Effect Assessment And Potential Study

In China, the rate of reserves of the low permeability oilfield gets more and more large in the total producing reserves. In these oilfields, considerable portion keeps the state of low production and low efficiency among them. This rate gets larger in the proven reserves petroleum-in-place. Then how to further improve the development effect for the developed low permeability oil field and hoe to develop rapidly and effectively for the proven reserves low permeabi1ity oilfield are very significant for the continued and steady development of the petroleum development.DaWang Bei oil field is a low permeability oilfield, and Da 37 block is a main block of this oil field. The oil-bearing area is 17.7 km2 and the proved reserves is 1738×104t. The course of ten years' development shows clearly that the oil reservoir is characteristic of the severe heterogeneous reservoir the low permeability, the shortage of natural energy and low productivity. On the basis of researching the geology of Da 37 block (concluding structure, reservoir and deposit features) and reservoir production characteristic (concluding productivity of oil well, block lapse, water-filled changing regulation and interlayer contradictory), the thesis wholly evaluates the development effect of Da 37 block, announces the heavy interlayer interference which the large number of oil layers, long oil-bearing interval many layers cooperative exploitation and cooperative water injection cause. At the same time, it analyzes the recovery efficiency under the condition of different driving, deduces the relation curve of theoretical water-bearing to recovery percent of reserves by utilizing phase permeability curves, analyzes the production rate-maintenance situation by applying the law of production declining and water-bearing rising and appraises the development effect of the oil field.By synthetically evaluating the development effect and current status, the thesis demonstrates the direction of excavating latent capacity. In the light of the main contradictory which exists during developing the low permeability reservoir, we adopt the effective countermeasure in order to improve the development effect and recovery efficiency. By carrying out fine reservoir descriptions, strengthening fine geology studies and reservoir evaluation, the thesis researches the law of sand distribution and well network adaptability. To make the development effect better, we reduce well spacing to develop the precursor experiment, infill well network appropriately, build effective producing pressure drop. The main characteristics of low permeable reservoir are as follows: bad reservoir physical property, low permeability, narrow channel which oil and water pass by, very strong percolation flow resistance force, the notable interaction force between liquid-solid interface and liquid-liquid interface. So the fluid of low permeable reservoir appears the percolation flow state of low speed and nonlinearity. And the same time the lower permeability is the greater starting pressure gradient and the more slow speed of pressure conduction is. In oil field development, this reflects mainly: lowenergy utilization ratio, rapid productivity drop, poor water-intake capacity, high hit pressure around the water input well, slow becoming effectively of producing well and a great part of driving pressure is used to overcome the pressure gradient. So by researching injection-production pattern adaptabi 1 i ty, relationship of well network density and ultimate recovery and well network density of economic limit, it brings out the suggestion of encrypting well network and according to the significance, divides the increasing production theories into: 1) improving the oil-bearing formation continuity; 2) improving the oil scavenge efficiency of plane and vertical plane; 3) developing the oil in pinching belt; 4) improving the economic limit.fn a word, by researching the structure , reservoir, development effect and remaining oil distribution, we have a clear recognition to the main probl...