Coiled tubing dragging sand blasting perforation and annulus sand filling staged fracturing method

A technology of sand blasting, perforating, and staged fracturing, which is used in earth-moving drilling, wellbore/well components, and production fluids. The effect of good integrity and lower construction cost

Active Publication Date: 2020-01-31
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method of coiled tubing dragging sand blasting perforation and annulus sand filling staged fracturing, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem that the existing bottom sealing tool is not suitable for small size The process of segmented fracturing in the casing and the existing segmented fracturing method are complicated and the construction cost is high

Method used

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  • Coiled tubing dragging sand blasting perforation and annulus sand filling staged fracturing method

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Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: as attached figure 1 As shown, the method of coiled tubing dragging sandblasting perforation and annulus sand filling staged fracturing is carried out as follows: the first step is to drill the well to the position of the fractured layer; the second step is to place the coiled tubing 1 , outer slip connector 2, hydraulic hand release tool 3, trough centralizer 4, sand blaster 5, trough centralizer 4, ball stop reverse circulation valve 6, screen pipe 7, collar locator 8, guide shoe 9. Fixedly connect together from top to bottom to form a fracturing string; the third step is to lower the fracturing string to the designed depth in the well, and position the sand blaster 5 to the formation perforation position through the collar positioner 8; In four steps, the sand-carrying fluid is injected from the coiled tubing 1, and the sand-carrying fluid passes through the fracturing string. Due to the blocking effect of the ball stop reverse circulation valve 6, the ...

Embodiment 2

[0029] Embodiment 2: as attached figure 1 As shown, the method of coiled tubing dragging sandblasting perforation and annulus sand filling staged fracturing is carried out as follows: the first step is to drill the well to the position of the fractured layer; the second step is to place the coiled tubing 1 , outer slip connector 2, hydraulic hand release tool 3, trough centralizer 4, sand blaster 5, trough centralizer 4, ball stop reverse circulation valve 6, screen pipe 7, collar locator 8, guide shoe 9. Fixedly connect together from top to bottom to form a fracturing string; the third step is to lower the fracturing string to the designed depth in the well, and position the sand blaster 5 to the formation perforation position through the collar positioner 8; In four steps, the sand-carrying fluid is injected from the coiled tubing 1, and the sand-carrying fluid passes through the fracturing string. Due to the blocking effect of the ball stop reverse circulation valve 6, the ...

Embodiment 3

[0030] Embodiment 3: As an optimization of the above embodiment, in the fourth step, the displacement of the sand-carrying fluid through the perforation is 0.5m 3 / min to 0.8 m 3 / min, the amount of sand used for perforation is 0.8m 3 to 1m 3 , in the sand-carrying fluid, the volume percentage of sand is 70% to 75%; or / and, in the fourth step, the pressure of injecting the sand-carrying fluid from the coiled tubing 1 is 20MPa to 70MPa.

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Abstract

The invention relates to the technical field of multistage fracturing of oil fields, in particular to a sectioned fracturing method adopting coiled tubing dragging sand-blasting perforation and annulus sand-filling. The sectioned fracturing method comprises the steps of first, well dredging and second, tool connecting. According to the sectioned fracturing method adopting coiled tubing dragging sand-blasting perforation and annulus sand-filling, perforation and fracturing integration is achieved through a one-trip pipe column; and interlayer packing is carried out through a sand-filling mode of induction-type sand plugging, and accordingly, a sand-blasting perforation dragging sectioned fracturing technique in a small casing is achieved, namely, coiled tubing dragging for sectioned fracturing of the pipe column and annulus sand-filling for achieving the sectioned fracturing technique can be conducted in a phi 101.6 mm small-size tail tube in a 5.5-inch casing sidetrack drilling horizontal well through the coiled tubing dragging sand-blasting perforation and annulus sand-filling sectioned fracturing method. According to the method, packing operation can be completed without a packer, therefore, by adopting the method, the cost of the packer is saved, and accordingly the construction cost is reduced.

Description

technical field [0001] The invention relates to the technical field of oil field multi-stage fracturing technology, and relates to a method for staged fracturing by dragging sandblasting perforation and annulus sand filling by a coiled tubing. Background technique [0002] With the in-depth development of oilfield development, many old oil areas have entered the stage of secondary development and repeated development. With the gradual increase of the scale of sidetracking horizontal wells with 5.5-inch casing windows in old wells in old areas, the reservoir stimulation method has also changed from In the past, single-stage fracturing with casing cementing and perforation was put into production, and it has changed to staged multi-stage fracturing. [0003] For the staged fracturing of horizontal wells, currently popular methods include open hole packer + sliding sleeve staged fracturing, perforated bridge plug combined staged fracturing, cementing sliding sleeve tool staged ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/114E21B43/26
CPCE21B43/114E21B43/26
Inventor 马永贵潘瀛徐传友马军王磊
Owner BC P INC CHINA NAT PETROLEUM CORP
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