Research On Horizontal Wells For Leak Detection And Sealing

Xinjiang Oilfield Development multilayer build reservoirs exist within strata reservoir development, reservoir heterogeneity and strong low-permeability characteristics, the multi-well exploration and development of large displacement directional wells and horizontal directional wells are used fracturing, acidizing, water and other technical measures to achieve productivity enhancement and stabilization. As late into the oilfield development, often downhole casing leaks and other accidents, need to be implemented to find the leak plugging engineering technology, the core technology is the card sealing tool and packer. General card with seal packer mainly by dragging and rotating column to achieve, in vertical wells and small displacement directional wells high success rate; and in the presence of a large multi-level Inoue unseal operational risk, the card can not be repeated letters and other issues and large displacement directional wells and horizontal wells requires directional packer having a go down, do not move the column to achieve N repetitions card seal (packer and unblocking) function; paper work based on traditional packer for these problems principle, using cylinder pressure packer linkage with the locking mechanism and flexibility from regulators closed, reverse circulation, pitching pressure-forced hydraulic unblocking mechanism, developed a large displacement horizontal wells and tube wells for a non column movement can be repeated unblocking packer packer. This new card sealing tool having packer stable performance, no mechanical unblocking force, etc., can achieve a downhole seal reusable card function, to overcome horizontal wells and extended reach wells difficult to unseal on any type wells, reduce operational risks and target cost; the main results of the research work in the following areas:(1) research and application of research tools seal card at home and abroad, to collect and understand the relevant patent literature and a variety of structural dimensions of the tool seal Cards, established design;(2) Effect of card sealing tools and failure mechanism, innovative design of a cylinder having a linkage packer pressure regulator locking, resilient self-unblocking, reverse circulation and air pressure-forced pitching and powerful hydraulic unblocking outburst prevention mechanism non-repeatable movement column sit unblocking packer, the well can be adapted to any type of leak plugging find conditions;(3) Based on PRO/E new packer tool components structural design and strength check is completed, the three-dimensional solid modeling work behavior and virtual prototype simulation. The card seal tool in the process of unblocking string stress analysis, calculation model with multiple card sealing tool, the formula for calculating string deblocking when given card sealing tool unblocking process solutions distribution of closure force.(4) the use of large deformation finite element theory incompressible rubber processing and simulation of materials test data; discusses the structural parameters card sealed plastic tube tool combined influence of the sealing performance; and taking several structural parameters of optimum level orthogonal analysis, the maximum contact stress assessment standards to further define the relationship between the primary and secondary impact of structural parameters and optimal fit; Finally cones outburst control structure has been optimized.