Sand prevention and well completion integrated packing and filling tool

A technology of sand control and tools, which is applied in the directions of sealing/isolation, production fluid, flushing of wellbore, etc., can solve the problems of high one-time investment cost, single function of process string, and influence on filling quality, etc., and achieve flexible and reliable opening and closing, The effect of expanding the seepage area and reducing the construction cost

Active Publication Date: 2022-05-17
山东普瑞思德石油技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also problems such as complex construction, high one-time investment cost, single function of the process string, and the need to run multiple process strings in one operation.
At the same time, during the gravel packing operation, the sand-carrying fluid is likely to generate eddy current erosion at the filling hole of the filling tool, resulting in damage to the filling hole, affecting the filling quality and reducing the productivity of the oil well
[0004] Chinese patent CN212508227U discloses a segmented gravel packing device for open-hole horizontal wells, which relates to the field of oil well sand control technology, including wellhead casing, grading hoop, downhole casing, tubing, first screen pipe, second-stage packing tool, and second-stage service tool , hydraulic packer, second screen, bottom service tool and bottom packing tool, bottom packing tool, second screen, hydraulic packer, second stage packing tool, first screen, downhole casing, grading hoop and The wellhead casing is fixedly connected sequentially from bottom to top; the second-stage service tool and the bottom service tool are slidingly connected with the second-stage filling tool and the bottom filling tool respectively, and the tubing is connected in series with the second-stage service tool and the bottom service tool; The pipe string needs to be lowered multiple times, and the construction steps are cumbersome

Method used

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  • Sand prevention and well completion integrated packing and filling tool
  • Sand prevention and well completion integrated packing and filling tool
  • Sand prevention and well completion integrated packing and filling tool

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] refer to Figure 1-2 As shown, an integrated pack-off and packing tool for sand control and completion includes an upper joint 1, a sealing assembly, a packing assembly and a lower joint 27, and also includes a backwash assembly and a central pipe I5, an upper joint 1, a backwash assembly, and a central pipe Ⅰ5. The filling assembly and the lower joint 27 are fixedly connected sequentially from top to bottom, and the sealing assembly is sleeved on the outside of the center pipe Ⅰ5;

[0034] refer to Figure 6 As shown, the filling assembly includes a connecting collar 14, a central tube II 15, an outer spring 17, a long sheath 19, a filter ring 20, a sealing sleeve 21, a filling sleeve 24, a ball seat 25 and an inner spring 26, and the connecting collar 14 is fixedly installed At the lower end of the central pipe I5, it is fixedly connected with the central pipe II15, the sealing sleeve 21, the filling sleeve 24 and the lower joint 27 from top to bottom; Figure 7 As ...

Embodiment 2

[0042] As a preferred embodiment of the present invention, this embodiment adds an anti-erosion inner ring 23 in the filling sleeve 24 on the basis of the first embodiment, specifically:

[0043] refer to Figure 6 and Figure 8 As shown, in this embodiment, an anti-erosion inner ring 23 is provided on the inner wall of the filling sleeve 24 inside the filling hole 28, and the material of the anti-erosion inner ring 23 is a high-strength alloy with high impact resistance.

[0044] The anti-erosion inner ring 23 inside the filling hole 28 is made of high-strength alloy. The filling hole 28 adopts a scientific flow angle, which can reduce the eddy current erosion during the filling operation, and can withstand the maximum displacement of 5.5 cubic meters per minute and the highest sand ratio. 70%, the maximum pressure is 35MPa, and the maximum sand volume is 120 cubic meters of fracturing and filling operations.

Embodiment 3

[0046] As a preferred embodiment of the present invention, this embodiment optimizes the structure of the backwash assembly on the basis of Embodiment 2, specifically:

[0047] refer to image 3 As shown, in this embodiment, the backwash assembly includes a backwash jacket 2, a backwash sliding sleeve 4 and a return spring 3, the upper end of the backwash jacket 2 is fixedly connected to the upper joint 1, and its lower end is fixedly connected to the center pipe I5; The sliding seal of the backwashing sleeve 4 is set in the inner cavity of the backwashing sleeve 2, and the first annular space Y1 is formed between them; the lower part of the inner wall of the backwashing sleeve 2 is provided with a limit for limiting the downward movement of the backwashing sleeve 4 platform, the backwash jacket 2 on the upper part of the limiting platform is provided with a first through hole X1 communicating with the first annular space Y1, the upper end of the return spring 3 is in contact ...

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Abstract

The invention discloses a sand prevention and well completion integrated packing and filling tool, and relates to the technical field of oil and gas well downhole operation tools, the sand prevention and well completion integrated packing and filling tool comprises an upper joint, a sealing assembly, a filling assembly and a lower joint, and further comprises a backwashing assembly and a central pipe I. The upper joint, the backwashing assembly, the central pipe I, the filling assembly and the lower joint are fixedly connected in sequence from top to bottom; the sealing assembly is arranged outside the central pipe I in a sleeving manner; the backwashing assembly is provided with a reset spring, so that the flexibility and the reliability of backwashing operation are enhanced; a filter ring and an anti-erosion inner ring are arranged on the filling assembly, so that the service life of the integrated packing and filling tool is prolonged; the device can be tripped in one time, and backwashing, setting, seal examining, fracturing filling, circulating filling and production operation can be completed under the condition that a tubular column is not lifted or other tools are not tripped in; compared with a traditional operation tool, the operation construction time can be saved by more than half, and the construction cost is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of downhole operation tools for oil and gas wells, in particular to an integrated isolation and filling tool for sand control and well completion. Background technique [0002] Unconsolidated sandstone reservoirs in my country have a large distribution range, large reserves, and production occupy an important position. Under normal mining conditions, sand production in oil wells is extremely harmful. In order to prevent sand production in oil wells, according to the requirements of oil layers and production processes, the corresponding sand control technology is adopted to ensure the normal production of oil wells. [0003] Gravel packing sand control technology is one of the most effective sand control methods for developing unconsolidated sandstone reservoirs at home and abroad. The sand control technology has the advantages of high success rate, long validity period, wide adaptability, and good sand cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/04E21B33/122E21B21/10
CPCE21B43/04E21B33/122E21B21/10
Inventor 邢秀贵耿瑞琪吴海燕徐晓跃王玉婷孙锐杰刘智仁王鹏张玉涛
Owner 山东普瑞思德石油技术有限公司
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