Device and working method for drilling hydrate tiny wellbore and rapidly completing well

Abstract

The invention discloses a device and working method for drilling a hydrate micro-hole and rapidly completing the well, and belongs to the technical field of hydrate mining devices and mining methods. It includes a continuous operation machine, a power control mechanism, a high-pressure water jet pump, a guide, a main pipe and a sub-pipe, the main pipe is connected to the continuous operation machine, and a water jet nozzle is connected to the end of the sub-pipe; the working method is generally as follows: first, Use a large-size drill bit to drill to the target layer at one time to form the main wellbore; secondly, use the high-pressure water jet device composed of the sub-tube to drill the horizontal micro-wellbore in the natural gas hydrate reservoir, and then heat the sub-tube to make the skin fall off and leave The screen is lowered; finally, the mother and child pipes are disconnected to complete the well. The invention is applicable to various natural gas hydrate exploitation methods, realizes the integration of drilling and completion, can effectively suppress sand production, increase the output of hydrate reservoirs, has little influence on hydrate reservoirs, and accelerates the progress of drilling.

Description

technical field [0001] The invention belongs to the technical field of gas hydrate mining devices and mining methods, and in particular relates to a device and working method for drilling small hydrate boreholes and rapidly completing wells. Background technique [0002] Natural gas hydrate (also known as combustible ice) is a non-stoichiometric clathrate compound formed by natural gas and water molecules under low temperature and high pressure conditions. Under ideal conditions, each standard cubic meter of hydrate can contain gas molecules equivalent to 180 times the volume of its own dissociated water. my country is the world's largest energy consumer, accounting for 23% of the world's energy consumption. Today, when oil resources are increasingly depleted, it is urgent to find a new energy with the advantages of large resources, high energy density and low pollution to replace traditional energy. However, natural gas hydrate has become a hot spot in various countries du...

AI Technical Summary

Problems solved by technology

[0004] However, these mining methods will destroy the stable structure of hydrate when opening the hydrate reservoir, resulting in the decomposition of hydrate

Moreover, in the process of mining, problems such as loose hydrate reservoirs and poor particle cementation lead to collapse of the overlying strata, sand production, etc., and frequent tripping and drilling, the completion process is time-consuming and laborious, affecting the construction schedule and production. The problem is the difficulty that hydrates often face during the mining process

Images