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Fracturing method for multi-interval oil and gas wells

A technology for oil and gas wells and fracturing, applied in the field of gas well development, can solve problems such as affecting the effect and output of natural gas exploitation, wasting manpower and financial resources, and killing live wells, so as to be easy to use and popularize on a large scale, improve construction efficiency, and reduce development. effect of steps

Inactive Publication Date: 2012-11-14
CHINA PETROLEUM & CHEM CORP +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the process is complex and cumbersome for the transformation of multiple sections of a single well, which wastes a lot of human and financial resources and is inefficient.
In addition, this method requires well killing, which will seriously pollute the fractured intervals, affect the extraction effect and production of natural gas, and even cause live wells to be killed

Method used

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  • Fracturing method for multi-interval oil and gas wells
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  • Fracturing method for multi-interval oil and gas wells

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Embodiment Construction

[0039] Such as Figure 2~8 As shown, the present invention is a multi-segment oil and gas well fracturing method. The method uses coiled tubing 12 with the same outer diameter to connect the common tubing 9 and run into the casing 26 to perform multi-segment perforation and fracturing operations. There are several ordinary oil pipes 9 which are connected to a certain length. The bottom end is connected with a sandblasting perforating gun 10, and the top is connected with a coiled oil pipe 12. After the connection is complete, the coiled tubing 12 is lowered, and the sandblasting perforating gun 10 is used to perform sandblasting and perforating, sanding and fracturing in the annulus, sand packing, transfer layer, and flushing of several intervals of the oil and gas well from bottom to top. Sand operation until the completion of the construction and transformation of all intervals of the oil and gas well. After the construction is completed, the combined pipe string is lifted, ...

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Abstract

The invention provides a fracturing method for multi-interval oil and gas wells. Fracturing is performed by means of dragging a common tubing by a coiled tubing, and the method includes the steps: completely connecting a fracturing working device; performing sand blasting and perforating for an oil and gas well interval by a sand-blasting and perforating gun at the tail end of the common tubing; implementing sand fracturing by the aid of the coiled tubing and a annular synchronous pump between the coiled tubing and a casing by means of injecting; filling a sand plug into the interval subjected to sand fracturing; dragging the coiled tubing to an upper to-be-reconstructed interval, and repeating the steps until completing fracturing of all the oil and gas well intervals; placing the coiled tubing down to wash the sand plugs of all the oil and gas well intervals; and pulling the coiled tubing out and hanging the common tubing at a wellhead for fluid discharging and production of an oil and gas well. Different from a structure of using a plurality of common tubing by connection in the prior art, a structure of a combined tubing string of the coiled tubing and the common tubing is used to implement perforation and drag fracturing for single-well multiple intervals, so that construction efficiency is improved while labor power, material resources and financial resources are saved.

Description

Technical field [0001] The invention relates to the fracturing reconstruction aspect in the field of gas well development, in particular to a fracturing method for reconstructing the reservoir section of a multi-segment oil and gas well by using a combination of coiled tubing and ordinary tubing. Background technique [0002] For the development of oil and gas wells in low-permeability oil and gas fields, hydraulic fracturing technology is the most fundamental technological method in the development of low-permeability oil and gas reservoirs, and it is also an important and economical method. For the development of single-well multi-segment oil and gas reservoirs, conventional fracturing methods generally use ordinary tubing and mechanical packers to perform multi-segment fracturing. The string structure is complex and it is difficult to achieve layer-by-layer fracturing. , And it is difficult to complete the development and use of multiple small layers. [0003] At present, there...

Claims

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Application Information

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IPC IPC(8): E21B43/14E21B43/26E21B43/11
Inventor 李晖傅伟曾晓建曹学军吴方益周天春刘华杰吴建忠蒋春光陈介骄陈冬林张明江易祖坤王绍红王宁涂生旭
Owner CHINA PETROLEUM & CHEM CORP
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