A large displacement integrated fracturing high and low pressure manifold device

Abstract

The invention belongs to the technical field of volumetric fracturing of horizontal wells in tight oil, and specifically provides a large displacement integrated fracturing high and low pressure manifold device, including a high pressure manifold group and a low pressure manifold group, characterized in that: the high pressure manifold The group is located directly above the low-pressure manifold group and is fixed on the manifold skid; the high-pressure manifold group is a type II double-pipeline structure composed of A pipeline and B pipeline, and the low-pressure manifold group is " The I" structure is composed of a transverse tube and a longitudinal tube connected at both ends of the transverse tube. The invention realizes the good fluid supply of a single sand mixing truck to 10-14 fracturing trucks for the volume fracturing of tight oil horizontal wells, realizes the displacement discharged by the sand mixing truck, the remote transmission of the discharge pressure and the energy gathering supply, and solves the problem of The shortcomings of insufficient pressure of the discharge assembly of a single sand mixer and the long distance of the discharge liquid supply pipeline are eliminated; the number of connections of high-pressure pipelines on site is reduced, and the 10m 3 The high-pressure and low-resistance injection at the wellhead with displacement per minute greatly reduces pipe wall friction and erosion safety hazards.

Description

technical field [0001] The invention belongs to the technical field of volume fracturing construction of horizontal wells in tight oil, and in particular relates to a large displacement integrated fracturing high and low pressure manifold device. Background technique [0002] In the process of volume fracturing, whether the construction displacement can meet the design requirements is an important factor to judge whether a construction is qualified, and it is also a prerequisite to ensure the smooth completion of the construction. With the current promotion of large-volume fracturing construction in tight oil horizontal wells and shale gas horizontal wells, the volume fracturing construction of tight oil horizontal wells presents a development trend of large displacement, large liquid volume, and large sand volume injection. The injection requirement of 6-10m3 / min will be achieved. However, the existing fracturing construction uses a single injection of 3" high-pressure pip...

AI Technical Summary

Problems solved by technology

However, the existing fracturing construction uses a single injection of 3" high-pressure pipeline, and the maximum displacement allowed for safe injection of a single 3" high-pressure pipeline is 2.8m3 / min, which greatly limits the construction scale. , it is necessary to connect four 3” high-pressure pipe fittings at the same time to meet the construction requirements

However, connecting multiple pipelines at the same time will cause uneven distribution of displacement between pipelines, and the pooling and hedging of the injection liquid at the wellhead will cause severe vibration at the fracturing wellhead and multiple pipelines, and the safety risk is large; the injection of multiple pipelines occupies a large operating site and cannot meet the requirements. Tight oil horizontal well operation site requirements; connecting multiple injection pipelines, labor-intensive and long preparation time

[0003] In addition, since there is no low-pressure manifold skid for the volumetric liquid supply of horizontal wells in tight oil, multiple fracturing pump trucks are required to be directly connected to the outlet of the sand mixer truck, and the remote fracturing truck’s liquid supply pipeline is far away, which cannot meet the water supply requirements of the fracturing truck. If calculated according to the large-scale fracturing of 10m3 / min, 10 2000-type fracturing trucks are required to work together. The minimum safe distance between the tail of the fracturing truck and the discharge outlet of the sand mixer is 6m, and the distance between the fracturing trucks is 3.2m. The upper water will reach 40-50m, unable to meet the working requirement of 0.35Mpa liquid supply, and unable to meet the construction requirements of volume fracturing

[0004] To sum up, there are two main factors affecting the large-volume fracturing operation: one is that the fracturing well sites are mostly located between hills and ravines, the scale of the fracturing well sites is limited, the effective parking is small, the construction distance is small, and the high-pressure pipelines The layout range is limited; second, the theoretical displacement of the currently used 100-barrel sand mixing truck is 15.9m 3 / min, (actually only up to 12m 3 / min operation requirements), installation vehicle connection specifications and site operation requirements, when 10 2000-type fracturing vehicles are connected to the sand mixer at the same time, the distance between the 6th and 10th fracturing vehicles will reach 40-50m, and the hydraulic pressure , The displacement cannot meet the operation requirements of fracturing trucks

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