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Small-diameter pipe staged fracturing production string and method for sidetracking wells and slim-hole wells

A small-diameter tube, staged fracturing technology, applied in wellbore/well components, earthwork drilling, fluid production, etc., can solve problems such as difficulty in reconstruction and formation damage cost, and achieve lower production tubing and casing costs, The effect of reducing production costs and prolonging the life of gas wells

Active Publication Date: 2021-01-26
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the existing difficulty in reforming, the problem that the reforming will cause damage to the formation and the cost is high, the present invention provides a small-diameter pipe segmental fracturing production string and method for sidetracking wells and slimhole wells. , the small-diameter tubing is lowered into the wellbore, and the fracturing string is dragged by the coiled tubing to carry out transformation. Compared with the production string, it can greatly reduce the cost; compared with the small diameter pipe used as the production string in the production process, it avoids the impact of the killing fluid on the reservoir productivity

Method used

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  • Small-diameter pipe staged fracturing production string and method for sidetracking wells and slim-hole wells

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Effect test

Embodiment 1

[0028] In order to overcome the existing difficulties in reconstruction, the reconstruction causes damage to the formation and the problems of high cost, the present invention provides such as figure 1 A production pipe string and method for segmented fracturing of small-diameter pipes for side drilling and small-hole wells are shown. Before fracturing, the small-diameter pipe is lowered into the wellbore, and the fracturing pipe is dragged by coiled tubing. The fracturing string is taken out after the reconstruction, and the small diameter pipe is left in the wellbore as the production string, which can greatly reduce the cost compared with the coiled tubing as the production string; Compared with the production string, the influence of the killing fluid on the reservoir productivity is avoided.

[0029] Production string for sidetracking and small-hole well with small-diameter pipe staged fracturing, including fracturing string, large casing 1, hanging packer 14, small casin...

Embodiment 2

[0033] Based on Embodiment 1, in this embodiment, preferably, the fracturing string includes coiled tubing 2, connectors 3, hydraulic safety joints 4, hydraulic sandblasters 5, bottom packers 6 and guides Check valve 7, the coiled tubing 2 is connected with the hydraulic safety joint 4 through the connector 3, and the lower end of the hydraulic safety joint 4 is connected with the hydraulic sandblaster 5, the bottom packer 6 and the guide check valve 7 in turn .

[0034] Preferably, the plurality of lower packers of the packer string are connected by small diameter pipe short joints.

[0035] Preferably, the diameter of the small diameter pipe 9 is 1 1 / 2 "~2", the material is 45# carbon steel; preferably, the diameter of the coiled tubing 2 is

[0036] The length of the medium and small diameter pipe 9 in the present invention is determined according to the depth of the construction gas well and the depth of the production layer.

[0037] Preferably, the large casing 1 i...

Embodiment 3

[0049] On the basis of Embodiment 1 or 2, in this embodiment, the depth of Well A in Sudong is 2895.5m, 5 1 / 2 "Casing completion, sidetrack from the 4" drill bit at 2810m, sidetrack to 2995m, use hanging packer to hang 3 1 / 2 "The casing is from 2780m to 2990m. Two floors are designed to be reconstructed, and the reconstruction positions are 2898.6m and 2975.5m respectively.

[0050] 1) The 2" small diameter pipe is connected to the packer string and run into the casing, so that the Y441 packer is placed at 2800m, and the upper and lower Y341 packers are placed at 2895.6m and 2972.5m respectively.

[0051] 2) The soluble ball of 38.1mm pumped is seated at the Y441 packer. After being pressed to 20Mpa, the packer string is lifted up, and the suspended weight increases infinitely, indicating that the Y441 packer and the Y341 packer have been set. .

[0052] 3) After 2 hours, the soluble spheres are dissolved, take The coiled tubing drives the bottom-sealing fracturing t...

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Abstract

The invention provides a small-diameter pipe staged fracturing production string and method for sidetracking wells and slim-hole wells. The small-diameter pipe staged fracturing production string comprises a fracturing string, a large casing pipe, a suspension packer, a small casing pipe, and a packing string composed of a small-diameter pipe, a packing string upper packer, a plurality of packingstring lower packers and a guide screen pipe; the suspension packer is arranged on the lower portion in the large casing, the upper end of the small casing pipe is connected to the suspension packer,and the inner diameter of the large casing pipe is larger than that of the small casing pipe; and the small casing pipe comprises a vertical corner section and an inclined section, the packing stringupper packer is arranged on the upper portion in the small casing pipe, the small-diameter pipe extends downwards in the direction of a center shaft of the large casing pipe, and the small-diameter pipe penetrates through the vertical corner section of the small casing pipe and extends towards the inclined section. According to the small-diameter pipe staged fracturing production string and methodfor the sidetracking wells and the slim-hole wells, after fracturing is completed, a packer string serves as the production string, stable production of the gas wells can be guaranteed, the full-life-cycle drainage gas recovery effect of the gas wells is improved, the service life of the gas wells is prolonged, and the development cost and the production cost of the gas wells are greatly reduced.

Description

technical field [0001] The invention relates to the technical field of downhole operations for oilfield exploration and development, in particular to a production pipe string and a method for segmented fracturing of small-diameter pipes for sidetracking and small-hole wells, which are suitable for sidetracking in gas fields or segmented fracturing of reservoirs in similar small-hole gas wells Fracture stimulation and completion production. Background technique [0002] Faced with the impact of low oil prices, new challenges have been raised for gas well development. For new development wells, small hole drilling + small diameter casing completion can greatly reduce the cost of drilling and completion, while 4" hole drilling + 3 1 / 2 "Casing completion is currently the cheapest way to drill and complete wells. For old wells with potential for excavation, sidetracking can not only save land acquisition costs, but also only need to hang the new casing at the tail of the orig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/14E21B33/122E21B43/114
CPCE21B43/26E21B43/14E21B33/122E21B43/114
Inventor 姜勇杨志伟张宏福刘锐任国富王在强赵晓伟唐军吕杨王汝阳
Owner PETROCHINA CO LTD
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