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A fixed-point multi-stage fracturing method for vertical wells and its application

A technology for fracturing and vertical wells, which is applied in earthwork drilling, wellbore/well components, production fluids, etc. It can solve the problems of complex drilling and grinding process, small construction displacement and high operation cost, and achieve the purpose of improving single well production and construction The effect of large displacement and low cost

Active Publication Date: 2019-08-02
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of low single well production after fracturing in the existing cluster perforation technology, small construction displacement in the layered fracturing technology of the layer, and the need for post-fracturing in the layered fracturing technology of the bridge plug. Drilling and grinding off the bridge plug, the drilling and grinding process is complicated, and the operating cost is high

Method used

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  • A fixed-point multi-stage fracturing method for vertical wells and its application
  • A fixed-point multi-stage fracturing method for vertical wells and its application
  • A fixed-point multi-stage fracturing method for vertical wells and its application

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Embodiment 1

[0026] In order to solve the problems of low single well production after fracturing in the existing cluster perforation technology, small construction displacement in the intralayer layered fracturing technology, and bridge plug layered fracturing technology needs to drill and grind off the bridge after fracturing. plug, the drilling and grinding process is complicated, and the operation cost is relatively high. This embodiment provides the following figure 1 and figure 2 A fixed-point multi-stage fracturing method for vertical wells shown, comprising the following steps:

[0027] Step 1. After the vertical well drilling is completed, the reservoir address parameters are determined according to the logging data, and the reservoir is divided into multiple fracturing sections. Each fracturing section is composed of oil layers and sand-mud thin interbeds from top to bottom;

[0028] Step 2: Run the casing 14 equipped with the casing seat 2 into the well, ensure that a casing s...

Embodiment 2

[0037] On the basis of Example 1, such as figure 2As shown, the perforating joint tool string consists of a bridle 5, a magnetic locator 6, a nozzle 7, a perforating gun 8, a gun tail 9, a setting tool 10, and an elastic ring delivery tool 11. The magnetic locator 6 is connected to the cable 1 through the bridle 5, and the torpedo 12 installed on the cable 1 is above the bridle 5.

[0038] The elastic ring 3 is crimped by a special tool and placed in the delivery tool. The delivery tool and the setting tool are threadedly connected, and the upper part of the setting tool 10 is threaded with the breech 9, mainly to seal the setting tool 10 and the perforating gun 8. The upper part of the perforating gun 8 is threadedly connected with the gun head 7. The magnetic locator 6 is mainly used to determine the precise position of the instrument after entering the well, so as to ensure the precise delivery of the elastic ring 3 and the perforation operation. The connection device, to...

Embodiment 3

[0040] On the basis of embodiment 1 or 2, such as Figure 5 As shown, the elastic ring delivery tool 11 is composed of a cylindrical part and a conical part connected from top to bottom. The outer diameter of the conical part is smaller than the inner diameter of the cylindrical part. Gunpowder and an elastic ring 3 are housed in the internal cavity of the gunpowder, and the elastic ring 3 is located below the gunpowder and is in a compressed state, coaxial with the cylinder.

[0041] Such as Figure 4 As shown, when the elastic ring 3 is in the elastic ring delivery tool 11, it is elastically compressed and the size is small ( Figure 4 left part), after the elastic ring 3 is dropped from the elastic ring delivery tool 11 to the casing seat 2, the elastic releases and the size becomes larger ( Figure 4 Right part), when the elastic ring 3 is released, it passes through the conical part, and then sits on the casing seat 2, and the elastic ring delivery tool 11 is finally li...

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Abstract

The invention provides a vertical-well fixed-point multistage fracturing method. The method includes the following steps: according to a plurality of fracturing segments divided from the reservoir stratum, when a casing is setting into a casing seat, performing well cementing and completion; putting a gauge cutter to the artificial well bottom; setting an elastic ring releasing tool and a perforation combined operation tool string to the position of the casing seat at the lowest end through a cable; energizing the cable to enable gunpowder in the elastic ring releasing tool to burn, and pushing an elastic ring out of the releasing tool to be seated on the casing seat; lifting the tool string through the cable to the perforation position for perforation, and pulling out the tool string; throwing in a soluble ball which is seated on an elastic ring to plug the lower layer, and performing fracturing through a polished casing to complete fracturing of this layer; repeating the above operation, and completing operation of multiple intervals from bottom to top in sequence till well completion. Polished casing injected fracturing is adopted, construction displacement is large, and technical requirements for volume fracturing are met; the bottom layer is plugged by the aid of the soluble ball, the soluble ball is dissolved after fracturing without drilling, the problem of drilling plug of the conventional bridge-plug separate-layer fracturing process is solved, construction is safe, and cost is low.

Description

technical field [0001] The invention belongs to the technical field of oil production engineering, and in particular relates to a method for realizing fixed-point multi-stage fracturing of a vertical well by adopting "casing seat + elastic ring + quick-dissolving ball". Background technique [0002] In recent years, Changqing Oilfield has developed a vertical well mixed water volume fracturing technology through volume fracturing technology, and achieved a breakthrough in the production of vertical wells for a type of tight oil with good reservoir properties. With the deepening of tight oil exploration and development, reservoirs Tight oil-thick layers with poor physical properties have gradually become the main horizons for exploration. This type of tight reservoirs develops thin sand-mud interbeds, and the sand bodies are thick (about 30 meters). There are two main types of conventional fracturing techniques: one One is to adopt clustered perforation, and then adopt a gene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21B43/263E21B43/116E21B23/14
CPCE21B23/14E21B43/116E21B43/26E21B43/263
Inventor 徐创朝赵振峰李宪文张矿生唐梅荣王成旺马兵王广涛曹宗熊郭小勇
Owner PETROCHINA CO LTD
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