| Haian oil field belongs to zhejiang oilfield branch, haian sag by the distance from the north sea of concave and curved pond, permeability basic in0.1-50x10-3mu m2, belongs to low permeability reservoir, haian oil field water injection well is taking water injection string is the layered water injection string and general injection string, layered water injection string is divided into two sealing side and top sealing points injection string and general injection string for bell mouth string, only the most basic of layered water injection string is not enough, there is a lot of defects in the process of the application of specific well in haian oilfield has exposed many shortcomings, in note13Wells have5Wells owe note, and easily happened in the process of water injection, the interference between layer and layer seriously affected the work process, at the same time, the stress of the tubing string is very unbalanced, jacking force exists, creep effect, cause the packer and water distributor is damaged, both waste a lot of tools, in this case, an urgent need to haian oil field are used to optimize the injection string.In this thesis, first, a large number of literature investigation, the use of statistics at home and abroad are summed up the past and present water injection string and its water flooding process, the next step is given by the haian oilfield internal related information, understand the current use of water injection string and based on the actual formation conditions and application analysis of pipe string using the existing string is insufficient, thus it raises one of the most important in the third section optimization of water injection string.Bridge eccentric integrated water injection string is introduced to haian oil field current string the general direction of the above change, respectively from the packer and the two aspects of water distributor, the optimized respectively. Mainly in terms of packer reference bridge eccentric integrated water injection packer, such points injection string is made up of casing protection packer, bridge type eccentric integrated water injection packer of packer and ordinary. Its biggest advantage is that can realize double card testing single injection, and in its working barrel body above the channel distribution of bridge type, so at the time of a single test, completely will not affect the other test way of collecting, thus has evidently improved the efficiency of packer in the introduction part, the first tells the story of the working principle of packer, then introduces the structure, each part respectively by1) creep analysis of string:eccentric separate injection tubing string stress and displacement analysis, displacement of the packer actual measurement and theoretical conclusion correction and correction results verify this four aspects in combination with improved now displacement problems of packer string, and after a series of corresponding measures (growth of tubing string length, anchor, support, etc.) after the error is within the scope of the condition;2) the packer seal original optimization:before in production practice, such as glue tube seal failure, glue barrel distortion phenomenon such as often happens, the consequences of such complex phenomena often leads to the sealing difficulties. Therefore in the process of improvement need to master some accurate calculation method, make the packer rubber tube structure, shape and size can be a reasonable match, prolong the service life of packer. Therefore, respectively from the stability of the shape of the rubber tube, rubber tube, seal of the original stress relaxation and improvements on the outburst prevention measures;3) slip structure:slip packer is in the process of anchor load, bear the load of the components and role is to support the packer, locking glue tube, it is good or bad will directly affect the performance of production safety, for its structure optimization from the stress and structure parameters to optimize the two aspects;4) packer and strength calculation string tools:when the layered water injection pipe string into the hole, is bound to exist a certain amount of liquid inside the wellbore, and the gravity of the liquid will affect the speed of the string into the hole, so the liquid inertia and compressibility will generate water hammer phenomenon, cause interference in the process of pipe string under well, may eventually make the packer setting and affect the service life of it in advance. Requires us, therefore, in the process of the design of the packer has water attack resistance structure in this area, need to take into account the specific data provided by the combination of haian oil field, the packer and other supporting tools of open differential calculation, ensure the safety of packer string setting. These aspects of existing packer optimization, the final conclusion bridge eccentric integration packer is meet Yu Haian oil field application, the packer can completely replace the current use.Haian oilfield water distributor is currently used conventional eccentric water distributor, the distributor in the flow of the water distribution said, due to the interference effect between layer and layer, primary water mouth of expansion of water will be a serious impediment to other layer, so that cause great fishing and allocate the amount of work; And injection pressure and reservoir pressure will affect the effect of injected water, at the same time, the eccentric water distributor, fishing and testing workload is huge, in multilayer injection, flushing time is very long, in the lower location could not have a chance to wash, only need to cast out, the repeated work, is very complex, in such cases, the constant flow eccentric water distributor arises at the historic moment, the practice found that the water distribution technology can greatly reduce the cast get up well, wash well success rate is also high. The introduction of constant LiuPei water aspect mainly through constant current eccentric structure and working principle of water distributor, the main characteristics of constant current eccentric water distributor two aspects of a simple description of constant LiuPei water device, the next in order to verify the water distributor efficient willfulness, again through the indoor experiment and field application demonstrate the effectiveness of it, because of the constant LiuPei is originally from zhongyuan oilfield application before a large number of inputs, so in addition to after reading a large number of relevant literature, and consulted many experts in the field. Get a lot of application examples, from their further strengthened the reliability.Through the paper with the introduction of the layered water injection string, the mechanism of water injection string parts structure can have a more profound understanding of, the introduction of a new bridge type eccentric integrated packer and the recombination of constant-current eccentric water distributor can more adapt to haian oilfield formation form, if the application of the research in this field of this implementation, will certainly achieve obvious economic and social benefits. |
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