High efficiency fracturing method using coiled tubing water-jet and soluble rubber plugs

A hydraulic jetting and soluble technology, applied in chemical instruments and methods, earthwork drilling, and fluid extraction, can solve the problems of reduced construction efficiency, complicated isolation tool strings, prolonged operation time, etc., so as to improve construction efficiency and success rate , Low cost of construction technology, and the effect of avoiding sand stuck pipe string

Inactive Publication Date: 2017-01-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sand plug seal is affected by the sand adding equipment, and the actual sand filling volume is difficult to measure; the wear and tear on the ground pipeline is relatively large; for reservoirs with small intervals, the sand filling volume is small, and the sand plug strength is difficult to guarantee and control; after the construction is completed, it is necessary to To flush the sand plug, only 1-2 sections can be constructed a day at most, which prolongs the working time and reduces the construction efficiency
The bottom packer has a complex isolation tool string and has high requirements for casing, so it is not suitable for wells with casing deformation; multiple times of setting and unsealing during construction have high requirements for the packer itself, and the number of fracturing stages is limited ;During construction, the upper part of the packer is easy to store sand, and the risk of sand stuck in the pipe string is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0027] Coiled tubing hydrojet and soluble rubber plugs are used as a high-efficiency fracturing method. include:

[0028] Pre-construction preparation stage: According to the number of fracturing stages, prepare enough base fluid, cross-linking liquid, cross-linking control agent and gel breaker for soluble rubber plugs to ensure that the gelation and breaking time of the rubber plugs is controllable and the strength is reliable; After the well and the well cleaning are qualified, the coiled tubing carries the sandblasting perforating gun into the wellbore, and the pipe string is checked so that the nozzle of the spray gun is aligned with the fracturing position of the first stage; Check high and low pressure pipelines and manifolds; ground pipeline pressure test, keep the pressure for 5 minutes without puncture or leakage;

[0029] Sandblasting and perforating stage: the coiled tubing carries the sandblasting perforating gun into the wellbore, the pipe string is checked so t...

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Abstract

The invention provides a high efficiency fracturing method using coiled tubing water-jet and soluble rubber plugs. The high efficiency fracturing method includes a sandblast and perforation stage, an annulus sand fracturing stage, a soluble rubber plug injection stage, a replacement stage, a curing and pressure test stage, and a blowout stage. The soluble rubber plugs are used as sealing members, the number of fracturing segments is not limited, the situation that sand blocks pipes can be avoided, gel-breaking of the rubber plugs can be controlled during construction, gel-breaking and rapid flow-back can be achieved at the same, and the construction efficiency and the successful rate can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of staged fracturing of horizontal wells in unconventional oil and gas reservoirs, and furthermore, relates to a high-efficiency fracturing method combined with coiled tubing hydraulic injection and soluble rubber plugs. Background technique [0002] With the rapid development of unconventional oil and gas reservoir development technology at home and abroad, the level of horizontal well staged fracturing technology has been further improved, and a variety of effective fracturing methods have been developed for different well completion methods. At present, the staged fracturing methods of horizontal wells with casing completion mainly include staged fracturing with pumping bridge plug, staged fracturing with packer in casing perforation pipe, staged fracturing with double packer, double seal and single pressure, and hydraulic fracturing. Jet staged fracturing and coiled tubing hydraulic jet annulus fracturin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/267E21B33/13C09K8/68
Inventor 吴春方陈作刘建坤王宝峰李双明姚奕明刘世华李静嘉
Owner CHINA PETROLEUM & CHEM CORP
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