Device and method for immovable-string type packer-free sliding-sleeve hydraulic-jet pulsed acid fracturing

A technology of hydraulic jetting and sliding sleeve, which is used in drilling pipes, casings, and earth-moving drilling and mining, etc., can solve the problems of the packer being corroded by acid liquid, the sealing effect is deteriorated, and the crack length is limited, and the construction method is mature. , The effect of reducing operation time and low construction cost

Inactive Publication Date: 2013-03-20
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mechanical packers can be used to implement layered or multi-stage fracturing in cased wells, but sand sticking is prone to cause downhole accidents, and the packer is corroded by acid liquid. Continued injection of acid after the length of time can no longer acidify and dissolve the formation, and the length of the formed fractures is limited

Method used

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  • Device and method for immovable-string type packer-free sliding-sleeve hydraulic-jet pulsed acid fracturing
  • Device and method for immovable-string type packer-free sliding-sleeve hydraulic-jet pulsed acid fracturing
  • Device and method for immovable-string type packer-free sliding-sleeve hydraulic-jet pulsed acid fracturing

Examples

Experimental program
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Effect test

Embodiment 1

[0060] As shown in Fig. 1, the first-stage non-moving string type non-packer sliding sleeve hydrojet pulsating acid fracturing device used when fracturing only the first-stage formation includes a guide head 1, a porous tubing nipple 2, and a one-way valve 3 , the first lower joint 4, the first centralizer 5, the first spray gun 6, the second centralizer 7, the first upper joint 8; from bottom to top, the guide head 1 is connected to the lower end of the porous tubing joint 2, and the guide The head 1 can ensure the smooth running of the tool into the well, and at the same time cooperate with the porous tubing nipple 2 to provide a flow channel for backwashing the wellbore; There are valve balls 31 and ball seat valves 32, which are used to realize the sealing of the non-moving string type non-packer sliding sleeve hydraulic jet pulsating acid fracturing device during acid fracturing and the opening of the tool channel during backwashing cycle operations; one-way The upper end...

Embodiment 2

[0071] As shown in Fig. 10, the two-stage non-moving string-type sliding sleeve hydraulic jet pulsating acid fracturing device used in fracturing two-stage formations is different from the two-stage non-moving one used in the first-stage formation in Example 1. The difference of the string-type non-packer sliding sleeve hydrojet pulsating acid fracturing device is that it also includes the second spray gun 9 and the second upper sub-joint 10; the upper end of the second spray gun 9 is connected to the working string through the second upper sub-joint 10 , the lower end is connected with the upper end of the first upper nipple 8; the second spray gun 9 is designed with a sliding sleeve 93 and a pin 92, and when performing the first-stage acid fracturing, the sliding sleeve 93 is fixed by the pin 92, sealing the second spray gun 9 The nozzle is used to carry out the first-stage acid fracturing only through the first spray gun 6; after the first-stage acid fracturing is completed,...

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Abstract

The invention relates to a device and a method for immovable-string type packer-free sliding-sleeve hydraulic-jet pulsed acid fracturing, belonging to the field of oilfield exploitation and relating to the device and the method for carrying out acid fracturing in a reservoir of an oil / gas well. The device comprises a guide head, a porous tubing nipple, a one-way valve, a first lower nipple, a first centralizer, a first spray gun, a second centralizer and a first upper nipple in sequence from bottom to top, wherein the one-way valve is used for realizing the closing and opening of the device, and the first spray gun is provided with a self excited oscillation nozzle for realizing hydraulic-jet pulsed perforating and acid fracturing. According to the invention, by utilization of a hydraulic entrainment packing effect produced by high-speed pulsed jet to carry out acid fracturing packing, the advantages of simple structure, safety and reliability are achieved; more layers can be subjected to acid fracturing by descending the device for acid fracturing in one step, balls are thrown stepwise to open a sliding sleeve so as to realize the stepwise acid fracturing of multilayer sections of the reservoir by an immovable string, and meanwhile, hydraulic perforating, hydraulic self-packing and pulsed acid fracturing can be realized at the same time; and by means of producing higher fluctuant stagnation pressure on a casing pipe and a well wall, a directional perforated hole can be formed rapidly, and compact belts generated due to explosion of a perforating bullet are prevented for the perforated hole.

Description

technical field [0001] The present invention belongs to the field of oilfield exploitation, and in particular relates to a device and method for acidizing and fracturing in oil and gas well reservoirs, and more specifically relates to a method of using self-excited oscillating nozzles to generate pulsed pulsating jets to carry out unsteady string type fracturing. Apparatus and method for packerless acid fracturing. Background technique [0002] With the continuous exploitation of global oil and gas resources, the proportion of low-permeability geological reserves in the remaining reserves continues to increase. In addition, some old oilfield reservoirs have gradually entered a period of low-pressure depletion. Reservoir fracturing has become a new low-permeability block and old oilfield. Basic technology of oil and gas development in depleted reservoirs. Usually, in some oil and gas wells, it is necessary to carry out stratified multi-stage fracturing along the wellbore at ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/27E21B43/114E21B17/10
Inventor 田守嶒李根生黄中伟宋先知张好林王海柱
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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