Preliminary Design And Implementation Of Underground Gas Storage Construction In Wen’an Oilfield

With the rapid development of beijing-tianjin-hebei region economy and the improvement of living standards, social demand for natural gas continues to grow. In combination with the second and third shanxi-beijing natural gas transportation pipeline construction, therefore, it is imperative to build up underground gas storages of a certain scale by using the nearby existing oil and gas reservoirs.Wen’an oil and gas reservoir is located in Ba County of Hebei Province, is located in Beijing, tianjin and hebei border location, unique geographical location, has the good geological conditions of gas storage.Firstly on the basis of fine structure interpretation, study on basic geological characteristics of reservoir, the reservoir development characteristics analysis, determine the renovation design of underground gas storage. Next to reduce the cost of building gas storage, consider the use of old wells Workers in all old well cementing quality inspection, and combined with drilling technology research institute, sure can take advantage of the old well. Finalize the new drilling well placement plan, during the deployment process and the feasible scheme, geological conditions, organic combination of three aspects of drilling engineering, and provide the location, design parameters and formulated the drilling risk in the process of implementation plan and protection measures, for an oil and gas fields and rehabilitation of underground gas storage well provides the technical support.1The fine3D seismic interpretation, implement the aim at the top of the layer structure, the basis of well placement.2The planar distribution of reservoir research is designed on the basis of well placement. Wen23fault-block reservoir property is obvious good Wen23-2fault block, so the first article Wen23fault-block early built libraries.3The design principle of gas storage well location design.(1) Uniform deployment involves in injection wells, principles for building a show: in accordance with the well number, set in the plan for building a consideration involves in injection Wells, the rationality of the distribution, satisfy the building of the each part uniform gas injection and extraction, using one old extraction well, new drilling of9involves in injection Wells, including vertical7Wells, using triangle well pattern, well spacing of300m;2Horizontal well, PI well horizontal section length350m, P2well horizontal section length400m;(2) The well location design and operation plan for building a consistent principles: fully analyzing building reservoirs development present situation at present, with the original interface of oil to water, oil and gas storage volume as determined as the foundation, under the premise of reservoir working gas capacity under construction, considering the present status of the bottom water, strict design new drilling bottom hole depth, so as to prevent water or maximum control gas extraction stage production;(3) Reflect drilling geological trajectory optimization principles:fully considering the reservoir oil and gas layer in the layer and heterogeneity characteristic of the new drilling in geological design, starting from the drilling trajectory control, drilling period for the development of reservoir formation or as much as possible to drill as much as possible in case multiple sets of oil group or small layer, reach the purpose of geological trajectory optimization design;4Make risk plans and safeguard measures is an important part of the project smooth implementation.(1) In drilling trajectory design, to give full consideration to the structural attitude and the relations between drilling trajectory of horizontal well drilling design requirements for the small bevel uncovered the objective layer, in order to prevent the top surface is lower than the design depth, formation of slope Angle and drilling trajectory, drilling along the attitude of stratum caused by walking the slope.(2) Strengthening drilling trace implement research, in the implementation of new drilling, well geological design personnel to site, to implement the drilling trajectory tracking analysis. Well drilling geological design personnel to implement the real-time tracking, accurate predictions, card must aim at the top of the layer. At the same time, according to the real drilling results, modification and adjustment of drilling trajectory, realization of objective interval trajectory optimization.Huabei oilfield to develop gas storage research began in the early90s, but the construction work in the early stages of implementation. Wen23underground gas storage will be a medium-sized one with effective storage10.8*108m3and working gas4.5×108m3. It will not only be definitely useful for seasonal peaking shaving in the area of Beijing, Tianjin and North China, but provide references for subsequent underground gas storage construction of Huabei Oilfield.