Immovable string hydraulic sandblasting fracture annulus pressure control method for gas field horizontal well

A technology of annular pressure and control method, which is applied in earthwork drilling, wellbore flushing, wellbore/well components, etc., and can solve problems such as sand discharge in decompression intervals, poor wellbore stability, and low annular pressure. Achieve the effects of ensuring the transformation effect, improving the construction efficiency and ensuring the stability of the shaft wall

Inactive Publication Date: 2015-05-20
PETROCHINA CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] An annulus pressure control method suitable for hydraulic sandblasting fracturing of 41 / 2" casing (screen) well completion without moving pipe string and 6" open hole completion without moving pipe string hydraulic sandblasting fracturing, which solves the problem of gas field Liquid nitrogen cannot be injected during hydraulic sandblasting fracturing with the fixed string, and the casing gate is fully opened during the perforation process, resulting in too low annular pressure, severe sand ejection in the depressed section, and proppant in the horizontal section. A large amount of deposits in the annulus of the oil casing, the risk of sand plugging is relatively high, and the stability of the wellbore wall is poor. In order to achieve the above objectives, the present invention provides a method for controlling the annulus pressure of hydraulic sandblasting fracturing with a non-moving string

Method used

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  • Immovable string hydraulic sandblasting fracture annulus pressure control method for gas field horizontal well

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Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1: as figure 1 as shown,

[0024] Annulus pressure control device for hydraulic sandblasting fracturing of horizontal wells in gas fields, guide shoe 1 is connected to screen pipe 2, the other end of screen pipe 2 is connected to check valve 3, and the other end of check valve 3 is connected to the first stage injection 4, the other end of the first-stage injector 4 is connected to the second-stage injector 5, the other end of the second-stage injector 5 is connected to the third-stage injector 6, and the other end of the third-stage injector 6 is connected to the fourth-stage Injector 7, the other end of the fourth-stage injector 7 is connected to the fifth-stage injector 8, the other end of the fifth-stage injector 8 is connected to the N-stage injector 9, and the other end of the N-stage injector 9 is connected to the safety joint 10. The other end of the safety joint 10 is connected to the construction oil pipe 11, and the other end of the construction o...

Embodiment 2

[0027] Embodiment 2: as figure 1 as shown,

[0028] The method for controlling the annular space pressure of the hydraulic sandblasting fracturing of the horizontal well in the gas field mainly includes the following steps: running the hydraulic sandblasting fracturing process string of the horizontal well in the gas field without moving the string, and aiming the injectors at the planned reconstruction position ; Install a throttle valve at the outlet of the wellhead casing, and connect the casing pipeline to the mud pool; perform sandblasting and perforation on the target section according to the construction design. pressure; after the perforation is completed, increase the displacement and increase the jet pressure, and at the same time adjust the annular pressure through the throttle valve, press the formation and close the casing gate to carry out the main fracturing construction. During the main fracturing construction of each section, the whole process Inject liquid n...

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Abstract

The invention provides an immovable string hydraulic sandblasting fracture annulus pressure control method for a gas field horizontal well, and belongs to the technical field of gas field horizontal well sectional improvement. An immovable string hydraulic sandblasting fracture technique string of the gas field horizontal well is laid in the gas field horizontal well, and ejectors are aligned to planned improvement positions; a throttle valve is installed at a wellhead sleeving and releasing outlet, and a sleeving and releasing pipeline is connected into a slurry pond; sandblasting and perforation are carried out on target sections according to construction design, an annulus is opened during sandblasting and perforation, and annulus pressure is controlled through the throttle valve; after perforation, displacement is increased, jet flow pressurization is improved, the annulus pressure is adjusted through the throttle valve, a stratum is pressed open and then a sleeve gate is closed for main fracture construction, and liquid nitrogen is injected in the whole process of main fracture construction of each section; a next layer hydraulic sandblasting fracture tool is opened in a ball throwing mode for next layer perforation and fracture construction; after pressing, the aims that liquid is quickly discharged, the flowback rate is increased, and construction risk is lowered are achieved.

Description

technical field [0001] The invention relates to a method for controlling the annular space pressure of a horizontal well in a gas field without moving a pipe string hydraulic sandblasting fracturing, and belongs to the technical field of staged transformation of a horizontal well in a gas field. Background technique [0002] As a new high-pressure water jet application technology, hydraulic sandblasting and staged fracturing technology has been widely used in the stimulation of horizontal wells in low-permeability oil and gas fields. low merit. However, there are the following problems in the application process: 1. During the perforation process, the casing gate needs to be fully opened, resulting in too low annulus pressure, which can only be accompanied by liquid nitrogen injection at the last stage of fracturing construction, and the liquid is drained after fracturing The period and final flowback rate are worse than those of compression-type open hole packer staged fra...

Claims

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Application Information

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IPC IPC(8): E21B43/267E21B21/00E21B43/114
CPCE21B43/26E21B21/08E21B43/114E21B43/267
Inventor 蒙鑫付钢旦王在强姜勇郭思文邵媛周少伟叶亮赵倩云
Owner PETROCHINA CO LTD
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