Well and layer selection method of flowback measures after injecting large-dose oil displacement liquid into oil production well nearby sandstone oil reservoir fault
A technology for sandstone oil reservoirs and oil production wells, applied in the field of oilfield development, can solve problems such as lack of effective and reasonable well selection and layer selection methods, and achieve the effects of long construction time, fast filtration loss, and guaranteeing smooth completion.
Inactive Publication Date: 2019-12-13
DAQING OILFIELD CO LTD +1
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Problems solved by technology
[0005] The present invention aims at overcoming the problem in the background technology that existing oil production wells near faults in sandstone reservoirs lack effective and reasonable methods for selecting wells and layers after injecting large doses of flooding fluid, and provide an oil production well near faults in sandstone reservoirs Well Selection and Layer Selection Method for Venting Measures After Injecting Large-dose Displacing Fluid
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Embodiment 1
[0038] The present invention will be further described in conjunction with Xing13-Ding3-45 well of Xingshugang Oilfield in Daqing Oilfield.
[0039] (1) Optimizing the target well
[0040] Well Xing 13-Ding 3-45 is a primary production well in the transitional zone of Xing 13 District. figure 1 It is the well location map of Xing 13-Ding 3-45 well. The well is located at the edge of the fault, and it is connected to three wells for unilateral water injection. There is no water injection well connected to the production wells near the fault, and the development effect of the well group is poor. The well is 153m away from the fault, which is greater than the required safety distance of 80m. There are roads in the well site, and vehicles can be entered and placed. The cementing quality of the oil zone is excellent. The technical condition of the casing is good, no reinforcement, no casing damage, no channeling, and no debris in the well.
[0041] The average thickness of the...
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The invention relates to a well and layer selection method of flowback measures after injecting large-dose oil displacement liquid into an oil production well nearby a sandstone oil reservoir fault. The problems that after the large-dose oil displacement liquid is injected into the oil production well nearby an existing sandstone oil reservoir fault, the flowback measures lack the effective and reasonable well and layer selection method are mainly solved. The well and layer selection method is characterized by comprising the following steps that (1) target wells are optimized, specifically, a,wells, with incomplete injection and production relationships, nearby the fault are optimized, b, wells with the distance from the fault by 80 m or above are optimized, c, it is ensured that downholeconditions, ground conditions and the like meet construction requirements, and d, oil production wells with the certain oil production capability, the high reserve, the low recovery degree and the high residual recoverable reserve are optimized; and (2) the target wells selected in the step (1) are subjected to target layer optimization. According to the well and layer selection method, the oil enhancement effect after the measures is ensured, the validity period of the measures is prolonged, through reasonable combination of layer segments, it is ensured that the process is completed smoothly, interference between oil layers is avoided, and the effect of protecting the oil layers is achieved to a certain extent.
Description
technical field [0001] The invention relates to the technical field of oilfield development, in particular to a method for selecting wells and layers for recovery measures after injecting large doses of oil displacement fluid into oil production wells near faults in sandstone reservoirs. Background technique [0002] The production wells near faults in sandstone reservoirs have the characteristics of imperfect injection-production relationship and abundant remaining oil. For this kind of potential wells, the oil field proposed a new large-scale fracturing method--injecting a large amount of displacement fluid from the production well and then returning it. In this method, a large-scale oil displacement fluid is continuously injected into the formation from the well end to directly replenish energy for the imperfect well points of injection and production; surfactant and alkali are added to the oil displacement fluid, and the oil displacement fluid is used for fracturing and ...
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IPC IPC(8): E21B43/22E21B43/26
CPCE21B43/16E21B43/26
Inventor黄有泉苗厚纯姚洪田杨为华李冰王树坤王清平何继峰
OwnerDAQING OILFIELD CO LTD