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Method for freezing formation water in gas drilling process

A technology of gas drilling and formation water production, which is applied in the direction of liquid/gas jet drilling, drilling equipment, drill pipe, etc., which can solve the problems of prolonging the construction time of gas drilling and shortening the drilling cycle, so as to shorten the drilling cycle and prolong the construction The effect of the well section

Inactive Publication Date: 2016-04-20
CHINA PETROCHEMICAL CORP +1
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Problems solved by technology

[0005] The present invention aims at the problems existing in the prior art, and provides a freezing treatment method for formation water in the process of gas drilling, which effectively solves the problem of formation water in the gas drilling process, so as to reduce or even safely control the formation water, and prolong the application of gas drilling construction The purpose of shortening the drilling cycle, ensuring downhole safety, reducing the comprehensive cost of drilling, and speeding up exploration and development

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  • Method for freezing formation water in gas drilling process
  • Method for freezing formation water in gas drilling process
  • Method for freezing formation water in gas drilling process

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with accompanying drawing:

[0019] The invention provides a method for freezing formation water produced during gas drilling, and the specific implementation process is as follows:

[0020] (1) Conventional gas drilling is carried out before drilling into water-producing formations. At this time, the annulus is mainly gas and cuttings, see figure 2 shown;

[0021] (2) When the gas drilling encounters the water-producing layer, the initial drilling cuttings return to the bonding phenomenon, and the amount of cuttings is significantly reduced, indicating that the formation is water-producing. See image 3 shown;

[0022] (3) When water is found in the formation, first complete the installation of the well site condenser 4, the gas temperature detection device 5 entering the well, the humidity sensor 8 and the temperature sensor 9, and the replacement of the ultra-low temperature drill pipe in the wel...

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Abstract

The invention relates to a method for freezing formation water in a gas drilling process. When formation water occurs in a gas drilling period, low-temperature gas that is condensed injected as a circulating medium into a well through a drill pipe and returns along with formation water and drill debris entering a shaft to a wellhead along an annulus when arriving at an outlet position; wherein the low-temperature gas returned up freezes the formation water dispersed in the annulus into particulate solid ice and carries it to the surface while freezing the well wall at the outlet position. The method enables a construction segment of gas drilling to be maximally extended, keeps efficient and safe drilling and high drilling speed and also prevents the problem of environmental pollution by waste water or waste mud caused in a foam drilling process.

Description

technical field [0001] The invention relates to a method for freezing formation water produced in the gas drilling process in the technical fields of petroleum and natural gas drilling, geological exploration and mine drilling. Background technique [0002] Gas drilling is currently one of the fastest and most economical drilling methods, and it has many advantages that drilling fluid drilling does not have. Using gas as the circulating medium, on the one hand, can greatly increase the drilling speed of the drilling machine and the drilling footage of a single drill bit; on the other hand, the gas used as the circulating medium has a low density, and the pressure on the wellbore is relatively low, which can effectively solve the problem of long open holes. Drilling fluid lost circulation and other complex problems in low-pressure fractured formations; at the same time, it has obvious technical advantages in preventing differential pressure sticking, discovering and protectin...

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Application Information

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IPC IPC(8): E21B7/18E21B36/00E21B17/00
Inventor 赵洪山冯光通王宗刚于海叶李琳涛夏文安徐云龙白立业
Owner CHINA PETROCHEMICAL CORP
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