Unlock instant, AI-driven research and patent intelligence for your innovation.

Use and maintenance method of reservoir section solid-free drilling fluid

A drilling fluid and solid-free technology, which is applied in drilling compositions, chemical instruments and methods, earthwork drilling and production, etc., can solve the problem of increased drilling fluid density, inability to effectively maintain the stability of drilling fluid density, desander, desander, etc. The low utilization rate of clay pots and other problems can achieve the effect of stabilizing the well wall, convenient preparation and maintenance, and avoiding formation block and collapse

Active Publication Date: 2021-03-19
CHINA UNITED COALBED METHANE +1
View PDF3 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, whether the solid-free drilling fluid can meet the solid control requirements depends to a large extent on the reasonable use of various cyclones, and the field drilling team only pays attention to the first-level solid control. The utilization rate of the middle desander and desilter is low, and the midway desilting operation or intermittent desilting method is often adopted, resulting in a significant increase in the drilling fluid density with the depth of the well, which cannot effectively maintain the relative stability of the drilling fluid density

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Use and maintenance method of reservoir section solid-free drilling fluid
  • Use and maintenance method of reservoir section solid-free drilling fluid
  • Use and maintenance method of reservoir section solid-free drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] (1) Experimental materials and reagents

[0058] Polyethylene glycol, AR; dimethyl diallyl ammonium chloride, technical grade; calcium carbonate, technical grade; husk fiber, technical grade; ammonium persulfate ((NH 4 ) 2 S 2 o 8 ), AR; sodium bisulfite (NaHSO 3 ), AR; deionized water.

[0059] During the experiment, the polyethylene glycol used was PEG-4000, AR grade; dimethylethylene ammonium chloride was selected as an industrial grade solution with a purity of 60%; the fruit shell fiber was selected as an industrial grade, and hickory shell and cotton fiber were selected As the main material, it is mixed at a ratio of 1:1. Hickory nut shells are ground and passed through a 10-mesh sieve. The cotton fibers are short cotton fibers with an average length of 4mm and an average diameter of 20μm.

[0060] (2) Main experimental instruments

[0061] Digital constant temperature water bath box; three-neck round bottom flask (500mL); analytical balance; thermometer; va...

Embodiment 2

[0112] Water + 1.5% GFJ-1 + 0.4% potassium polyacrylate + 1.0% film-forming agent + 3% lignite resin + 2% carboxymethyl starch is used as the solid-free drilling fluid system in the reservoir section.

[0113] When the solid phase content of the drilling fluid exceeds the design requirements, at least three levels of solid control equipment (vibrating screen, desander, desilter) are required to reduce the solid phase content to less than 6% of the drilling fluid quality; sand content Less than 0.2%, the density is controlled at 1.02~1.04g / cm 3 , as far as possible the lower limit is given priority to. During the drilling process, by continuously using the three-stage solid control equipment, and at the same time frequently dredging sand and clearing the sand settling tank, the harmful solid phase in the drilling fluid can be removed in time, and the low solid phase and low sand content of the drilling fluid can be kept, which can reduce the impact on the Good protection again...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
lengthaaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

Abstract

The invention provides a use and maintenance method of reservoir section solid-free drilling fluid. The use and maintenance method comprises preparation of the reservoir section solid-free drilling fluid and performance maintenance of the drilling fluid. The reservoir section solid-free drilling fluid is prepared by mixing a plugging anti-collapse inhibitor, a stabilizer, a tackifier, a film-forming agent, a filtrate reducer and water. According to the reservoir section solid-free drilling fluid, the plugging anti-collapse inhibitor forms a layer of effective isolating film formed on the surface of a well wall by utilizing polymeric alcohol, so that a channel for the drilling fluid to permeate into a stratum is blocked; shells and fibers are added to form a complex net-shaped structure, sothat the depth of the drilling fluid invading the stratum is reduced; meanwhile, dimethyl diallyl ammonium chloride reacts with the polymeric alcohol to enhance the inhibition and dispersity of the system, so that the effect of effectively stabilizing the well wall is achieved; with other assistants adopted, the drilling fluid system has high rheological property, filtration property and inhibition property; and the system is simple in formula and convenient to prepare and maintain.

Description

technical field [0001] The invention belongs to the technical field of coal bed gas exploitation, and in particular relates to a method for using and maintaining solid-free drilling fluid in a reservoir section. Background technique [0002] Coalbed methane is a kind of unconventional natural gas resource that is self-generated and self-storage in the coal seam itself, and its main component is methane. The global coalbed methane resources are 256.3×10 12 m 3 , of which my country's coalbed methane resources are about 36.81 trillion m 3 Therefore, the full development and utilization of coalbed methane is of great strategic significance to make up for the shortage of oil and natural gas in my country. Wellbore instability and reservoir damage during the drilling and completion of coalbed methane wells have always been the key to the efficient development of coalbed methane. The solid-free drilling fluid system has a good ability to carry and suspend cuttings, and can eff...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/12E21B21/06
CPCC09K8/12E21B21/065C09K2208/04C09K2208/08
Inventor 马腾飞朱光辉米洪刚孙新阳张平杨刚程璐李丹琼侯岩波李志勇
Owner CHINA UNITED COALBED METHANE