Filling tool assembly, self-adaptive water control screen pipe string and experimental method

Abstract

The invention provides a filling tool assembly, a self-adaptive water control screen pipe string and an experimental method, and belongs to the technical field of oil and gas well completion. The filling tool assembly comprises a top packer, a first sealing device, a filling sliding sleeve and a second sealing device which are coaxially arranged and sequentially connected from top to bottom, and central through holes of the top packer, the first sealing device, the filling sliding sleeve and the second sealing device are sequentially in communication and are internally provided with filling service tools. Liquid outlet holes are formed in the filling sliding sleeve. The filling service tools can move up and down along the axes in the central through holes in communication, and positive circulation and reverse circulation of the formation fluid are achieved. According to the filling tool assembly, the self-adaptive water control screen pipe string and the experimental method, the effectof reinforcing the stratum to prevent a screen pipe from being deformed and blocked can be achieved while the sand is prevented from being discharged, and the oil yield and the recovery ratio of a single well are increased.

Description

technical field [0001] The invention belongs to the technical field of oil and gas well completion, and in particular relates to a filling tool assembly, an adaptive water control screen pipe string and an experimental method, which are used for flow control profile control and mechanical sand control in horizontal wells. Background technique [0002] There have been some researches and achievements at home and abroad on the research work of gravel packing technology in horizontal wells. Major companies at home and abroad use large-scale real-scale horizontal well gravel-packing simulation test devices to carry out horizontal well gravel-packing mechanism test research, and establish horizontal well gravel-packing mathematical models to carry out horizontal well gravel-packing numerical simulation, parameter optimization and sand control effect prediction, etc. The research has achieved ideal results. [0003] However, the combination of water-controlled oil production comp...

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Problems solved by technology

[0003] However, the combination of water-controlled oil production completion and horizontal gravel packing technology is not common in foreign countries at present. Most of the water-controlled completion technologies currently used in foreign countries are based on inflow control devices, and adaptive water-controlled completion technologies are not yet widely used. However, there is almost no research work on gravel packing combined with the research on the secondary completion technology of self-adaptive flow control and water control.

[0004] Chinese patent publication CN203808956U discloses a profile control device and system to solve the problem that injection needs to be stopped on site before profile control measures in the prior art

The device is mainly used to control the injection of profile control agent, which belongs to the category of active injection profile control, but this patent does not involve the issue of controlling the outflow of the reservoir around the wellbore, let alone the device and structure for controlling the outflow profile of the reservoir fluid

The document "Water-controlled Completion Technology for Horizontal Wells in Bottom Water Reservoirs of Dagang Oilfield" mainly introduces the distribution of liquid-producing profiles in the horizontal section and the analysis of water-controlling mechanism. Segmented water control completion strings with different isolation technologies have realized variable parameter design of screens, but they have not involved the scope of segmented water control, let alone horizontal wells completed with screens in the early stage. Tools and Methods for Segmentally Controlled Water Completion

[0005] The current situation is: for the completion of some horizontal wells, the problem of sand production in the production process after water control is also a very prominent problem. Therefore, the sand control performance of the water control screen is a very key indicator, especially for fine powder For sandstone and unconsolidated sandstone, ordinary screens are difficult to achieve good sand control performance and sufficient fluid production. Therefore, the application of water control completion combined with horizontal well water control oil production technology and horizontal well gravel packing technology is a new development of current petroleum technology. very difficult problem

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