Well drilling method for using dry ice drilling fluid to assist in rock breaking
A drilling fluid and dry ice technology, applied in drilling equipment and methods, drilling equipment, wellbore/well parts, etc., can solve the problems of poor high temperature resistance of drilling fluid, high drilling construction cost, and poor drillability of rock formations. The effect of improving rock breaking efficiency, increasing drilling speed and reducing drilling cost
Active Publication Date: 2016-12-21
TAIYUAN UNIV OF TECH
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Problems solved by technology
In order to overcome the technical deficiencies in drilling under high temperature and high pressure, such as poor stability of drilling tools, poor high temperature resistance of drilling fluid, poor drillability of rock formations, poor drilling stability, and high drilling construction costs due to high temperature and high pressure, the present invention discloses a Drilling method using granular dry ice as drilling fluid to assist rock breaking in hot dry rock drilling
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[0023] Attached below figure 1 , figure 2 , image 3 The present invention will be further described.
[0024] Injection wells and production wells are constructed in a delineated hot dry rock geothermal development area. During the construction process, granular dry ice is used as drilling fluid to assist rock breaking drilling methods. The specific steps are as follows:
[0025] (1) According to the exploration results of geological conditions, it is decided to arrange the injection well and production well in the granite layer with a depth of 2000m and a temperature of 200°C. The drilling fluid is granular dry ice, and the injection pressure is greater than 50MPa.
[0026] (2) Complete the preparatory work before drilling construction, such as well hole positioning, drilling rig in place, etc. Firstly, the wellbore positioning is carried out according to the well group layout plan and spacing, and then the drilling equipment is installed. Assemble the derrick 5 accordi...
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The invention provides a well drilling method for using dry ice drilling fluid to assist in rock breaking and belongs to the technical field of hot dry rock geothermal well drilling construction. Granular dry ice serves as drilling fluid, heat absorption during different phase state changes of carbon dioxide is sufficiently utilized to cool a drilling tool, temperature gradient is generated on rock mass in front of a drill bit, the rock mass is subjected to thermal fracture, then the properties of the rock mass are weakened, and the rock breaking assisting function is achieved. In the circulation process of the dry ice drilling fluid, the functions including (1) drill bit cooling and lubricating, (2) rock breaking assisting, (3) rock waste carrying and (4) well wall system stability maintaining are brought into full play. Meanwhile, cyclic utilization of the dry ice drilling fluid is achieved on the ground. Through the well drilling method, the difficult problem of well drilling under high temperature and high pressure conditions can be solved, the technical problems that due to the high-temperature and high-pressure environment, the drilling tool stability is poor, the performance of the drilling fluid is poor, the drillability of a rock stratum is poor, the stability of a drill hole is poor, and the well drilling construction cost is high are solved, and the technical defects of hot dry rock geothermal development well drilling construction are effectively overcome.
Description
technical field [0001] The invention belongs to the technical field of hot dry rock geothermal drilling construction, and particularly relates to a method of using granular dry ice as drilling fluid to absorb heat and undergo phase changes during geothermal drilling construction to achieve the purpose of cooling drilling tools, and at the same time generate The temperature gradient causes the rock mass to be thermally fractured and weakened, and then the supercritical carbon dioxide generated in the high temperature and high pressure environment is easier to break the rock, remove the slag, and protect the wall. Specifically, it is a drilling method that uses dry ice drilling fluid to assist rock breaking. Background technique [0002] As a green and renewable resource, geothermal energy has been identified by countries all over the world as a new "green energy" to maintain sustainable social development. Hot dry rock geothermal generally refers to the geothermal energy reso...
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IPC IPC(8): E21B7/00E21B21/00E21B36/00
CPCE21B7/00E21B21/00E21B36/001
Inventor 郤保平石晓蕾郤子轩崔继明李广林
Owner TAIYUAN UNIV OF TECH
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