Natural gas horizontal well completion method

一种水平井、天然气的技术，应用在井眼/井部件、钻孔设备和方法、化学仪器和方法等方向，能够解决没有天然气水合物完井技术、无法满足水合物开发、地层成岩性差等问题，达到解决钻压施加困难、稠化时间可调、防止水-气窜的效果

Active Publication Date: 2017-01-04
HUAXIN TANGSHAN PETROLEUM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Because the physical environment of hydrate reservoirs is deep water and shallow layers, it may have new characteristics such as poor formation diagenesis, formation strength, and poor permeability (due to hydrate solidification), so traditional hydraulic fracturing stimulation technology cannot meet the requirements of hydrate development. need
[0005] After searching the existing technical patent documents at home and abroad, it is found that there is no patent related to natural gas hydrate completion technology

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0034] Embodiment 1: in combination with Figure 1-7 , to further describe the present invention:

[0035] The present invention includes adopting a large-sized drill bit to drill to the target well depth at one time to form a large main borehole 5, and then using radial horizontal well technology to drill multiple horizontal branch boreholes 6 in the natural gas hydrate reservoir. The specific steps are as follows:

[0036] After the operation of a large main borehole 5 is completed, the downhole skewer 21 is lowered, and the whole set of devices is fixed on the casing 8 at the bottom of the well;

[0037] 2. Lower the build-up guide 9, insert it into the positioning hole 22 of the guide groove 23 of the first horizontal branch wellbore 6, and at the same time, run the high-pressure flexible nozzle into the guiding follow-up screen 10, guide the follow-up screen 10 The front end is equipped with a high-pressure jet drill bit 12, which can drill forward with the help of its o...

Embodiment 2

[0047] Example 2, the difference from Example 1 is that the window sealant used is composed of the following components by weight: 100 parts of G-grade oil well cement, 30 parts of reinforcing agent, 70 parts of hollow microspheres, and 3 parts of early strength agent , 1 part of dispersant, 3 parts of retarder, 1 part of defoamer, 4 parts of fluid loss reducer, 100 parts of water, density 1.2~1.7g / cm -3 ; Wherein the strengthening agent is fly ash and its physical properties are: fineness ≤ 20%, sulfur trioxide ≤ 3.0%; early strength agent is KAl(SO 4 ) 2 ; The dispersant is amino acid sulfonated formaldehyde-acetone condensation polymer, the relative molecular mass is 8000~60000; the retarder is citric acid; the defoamer is tributyl phosphate; the fluid loss reducer is carboxymethyl hydroxyethyl cellulose One of them, the viscosity of 2% aqueous solution at 25°C is 7000~12000mPa·s. The window sealant, that is, the cement slurry system is stable, which can not only meet the...

Embodiment 3

[0048] Example 3, the difference from Example 1 is that the window sealant used is composed of the following components by weight: 100 parts of G-grade oil well cement, 25 parts of reinforcing agent, 40 parts of hollow microspheres, and 3 parts of early strength agent , 1 part of dispersant, 2 parts of retarder, 1 part of defoamer, 3.7 parts of water loss reducer, 80 parts of water; wherein the strengthening agent is ultrafine slag, and the early strength agent is KAl(SO 4 ) 2 ; The dispersant is amino acid sulfonated formaldehyde-acetone condensation polymer; the retarder is citric acid; the defoamer is polyoxyethylene polyoxypropanolamine ether; The viscosity of the aqueous solution is 7000~12000mPa·s.

[0049] The window sealant, that is, the cement slurry system is stable, which can not only meet the special conditions of the natural gas hydrate formation, but also effectively prevent the hydrate layer from sealing shallow water-gas channeling, and has good construction p...

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Abstract

The invention relates to a natural gas horizontal well completion method. According to the technical scheme, the natural gas horizontal well completion method comprises the steps that the target well depth is drilled at a time with a large-size drill bit, and a large hole is formed; a plurality of horizontal branch holes are drilled out in a natural gas hydrate reservoir through the horizontal well technology; and the contact surface area between the reservoir and the holes is increased to the greatest extent. The natural gas horizontal well completion method has the beneficial effects that the downhole complex conditions in the exploitation process is avoided or decreased; the number of the holes can be greatly increased; the bare area and the depth of the natural gas hydrate reservoir are increased to the greatest extent by the holes; the recovery ratio is greatly increased; the well spacing number and the development investment are decreased; and a window sealant is adopted, thus, a cement slurry system is stable, strength development is rapid, the thickening time is adjustable, hydrate layer sealing shallow water-gas channeling can be effectively prevented, and the construction performance is good.

Description

technical field [0001] The invention relates to the field of unconventional natural gas engineering, in particular to a natural gas horizontal well completion method. Background technique [0002] Natural gas hydrate is mainly distributed in deep-sea shallow sediments. It is an ice-like crystalline substance formed by natural gas and water under high-pressure and low-temperature conditions. Because it looks like ice and can burn when exposed to fire, it is also called " Combustible ice" or "solid gas" and "air ice". Its resources are equivalent to twice the sum of fossil fuel resources such as coal, oil and natural gas in the world. Natural gas hydrate is recognized as an important follow-up energy source with good prospects. It has the advantages of wide distribution, large amount of resources, high energy density and no pollution. Since the 1980s, many countries have paid great attention to the research of natural gas hydrate, and from the perspective of energy strategy,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/30E21B43/26E21B7/04E21B7/18E21B7/08E21B33/13C09K8/467
CPCE21B7/046E21B7/061E21B7/185E21B33/13E21B43/261E21B43/30C09K8/467E21B41/0099
Inventor 不公告发明人
Owner HUAXIN TANGSHAN PETROLEUM EQUIP CO LTD
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