Horizontal drilling and coring of directional window cutting and matching methods

A technology of horizontal drilling and horizontal drilling, which is used in the production of fluids, earthwork drilling, wellbore/well components, etc., can solve the problems of poor oil field stimulation effect, etc., to improve the single well production, increase the diameter and length of the borehole Effect

Inactive Publication Date: 2017-05-31
DAQING JINGTAI PETROLEUM ENG TECH
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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 provide a directional window-opening horizontal drilling, coring and matching method, which overcomes the problem that the current various production and injection techniques are used alone, and the oilfield production stimulation effect is poor. Taking fracturing technology as an example, detailing the advantages of this supporting technology

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  • Horizontal drilling and coring of directional window cutting and matching methods
  • Horizontal drilling and coring of directional window cutting and matching methods

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Experimental program
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Effect test

Embodiment 1

[0017] figure 1 It is a schematic diagram of the structure of the present invention. The arrow in the figure shows the injection direction of the fracturing fluid. The directional windowing horizontal drilling, coring and supporting methods of the present invention are tested in an oil field, and the well depth is 1762.39 meters. The method includes the following steps during use :

[0018] (1) Use ultra-short radius radial horizontal drilling tools to drill wells, and form horizontal wellbore under the guidance of the skewer 1;

[0019] (2) Use packer 3 to seal off casing 2 above inclined device 1;

[0020] (3) Use the fracturing string 4 to inject fracturing fluid with a pressure of 36MPa to form main fractures 5 in the formation;

[0021] (4) Block the main crack 5 with a temporary plugging agent;

[0022] (5) Increase the pressure of the fracturing fluid by 5-10 MPa, and inject it again through the fracturing string 4 to form a large number of secondary fractures 6 arou...

Embodiment 2

[0024] The directional window-opening horizontal drilling, coring and matching method of the present invention are tested on an oil field, the well depth is 2301.9 meters, and the method comprises the following steps during use:

[0025] (1) Use ultra-short radius radial horizontal drilling tools to drill wells, and form horizontal wellbore under the guidance of the skewer 1;

[0026] (2) Use packer 3 to seal off casing 2 above inclined device 1;

[0027] (3) Use the fracturing string 4 to inject fracturing fluid with a pressure of 44.6MPa to form main fractures 5 in the formation;

[0028] (4) Block the main crack 5 with a temporary plugging agent;

[0029] (5) Increase the pressure of the fracturing fluid by 5-10 MPa, and inject it again through the fracturing string 4 to form a large number of secondary fractures 6 around the main fractures 5 in the formation.

Embodiment 3

[0031] The directional window-opening horizontal drilling, coring and supporting methods of the present invention are tested in an oil field, and the well depth is 3262.65 meters. The method comprises the following steps during use:

[0032] (1) Use ultra-short radius radial horizontal drilling tools to drill wells, and form horizontal wellbore under the guidance of the skewer 1;

[0033] (2) Use packer 3 to seal off casing 2 above inclined device 1;

[0034] (3) Use the fracturing string 4 to inject fracturing fluid with a pressure of 55.2MPa to form main fractures 5 in the formation;

[0035] (4) Block the main crack 5 with a temporary plugging agent;

[0036] (5) Increase the pressure of the fracturing fluid by 5-10 MPa, and inject it again through the fracturing string 4 to form a large number of secondary fractures 6 around the main fractures 5 in the formation.

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Abstract

The invention relates to horizontal drilling and coring of directional window cutting and matching methods. The process comprises the steps: (1) drilling a horizontal hole using an ultra-short radius radial horizontal drilling tool guided by a whipstock; (2) plugging the position of a casing above the whipstock by using a packer; (3) injecting a fracturing fluid by using a fracturing string to form a major fracture in the stratum; (4) plugging the major fracture with a temporary plugging agent; and (5) improving the pressure of the fracturing liquid by 5-10 MPa, and injecting once more the fracturing liquid via the fracturing string to form a great quantity of secondary fractures around the major fracture in the stratum. According to the invention, ultra-short radius radial horizontal drilling and fracture network fracturing are combined so that the direction of a horizontal hole can be determined and a drilling diameter and a drilling length can be increased on the basis of the existing techniques; common fracturing is replaced by fracture network fracturing; thus, a new production-increasing and efficiency-raising technique is provided in the aspects of excavating potential remaining oil, improving low permeability reservoirs, etc., allowing tenfold increase or more in per-well production.

Description

technical field [0001] The invention belongs to the technical field of oil fields, and relates to a horizontal drilling with directional window opening, coring and matching methods. Background technique [0002] In the process of oilfield development, due to the increasing difficulty of mining, various technologies for increasing production and efficiency are emerging. The ultra-short radius directional window horizontal drilling, coring and supporting technologies mentioned in this article are also common technologies for increasing production and efficiency in recent years. , when the above two technologies are implemented, generally a single technology appears in one well, and at the same time, ultra-short radius horizontal drilling (high-pressure hose jet drilling) combined with ordinary fracturing technology, due to ultra-short radius horizontal drilling The uncertainty of the direction of the hole (high-pressure hose jet drilling) entering the formation, and the sharp ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/267
CPCE21B43/267
Inventor 李富国张亚胜解佳音
Owner DAQING JINGTAI PETROLEUM ENG TECH
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