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A kind of solid-free drilling fluid, its preparation method and application

A drilling fluid, solid-free technology, used in chemical instruments and methods, drilling compositions, etc., can solve the problems of reducing fluorescence level, reservoir damage, etc., and achieve effective wellbore stabilization, high rheology, and swelling capacity. reduced effect

Active Publication Date: 2022-04-12
CHINA UNITED COALBED METHANE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The system passes through the liquid SO 3 Instead of concentrated sulfuric acid, sodium sulfite, etc. used in the past for sulfonation reactions, the sulfonation efficiency is effectively improved, and low-fluorescence anti-slump asphalt and low-fluorescence special-effect anti-slump fluid loss reduction agent are prepared, which are then processed by a new process of compound acid sulfonation treatment. Reducing the fluorescence level improves the mud cake quality of the drilling fluid, reduces the high temperature and high pressure water loss and friction coefficient of the drilling fluid, and improves the effect of anti-slumping and filtration loss reduction. Material flowback design, some residual substances are likely to cause damage to the reservoir

Method used

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  • A kind of solid-free drilling fluid, its preparation method and application
  • A kind of solid-free drilling fluid, its preparation method and application
  • A kind of solid-free drilling fluid, its preparation method and application

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preparation example Construction

[0050] The present invention also provides a method for preparing the above-mentioned plugging and anti-slump inhibitor, comprising: mixing dimethyl dienyl ammonium chloride, polymer alcohol, granular plugging material, fibrous plugging material and initiator in water Heating and reacting to obtain the plugging and anti-slump inhibitor; the granular leakage plugging material includes fruit shells.

[0051] The present invention has no special restrictions on the sources of all raw materials, which can be commercially available; the dimethyl dienyl ammonium chloride, polymer alcohol, granular plugging materials and fibrous plugging materials are all the same as above, in This will not be repeated here.

[0052] In the present invention, it is preferred to first mix dimethyl dienyl ammonium chloride with water; the volume ratio of said dimethyl dienyl ammonium chloride to water is preferably (1-3): 100, more preferably (1~2.5):100, more preferably (1~2):100, most preferably 1.5...

Embodiment 1

[0074] (1) Experimental materials and reagents

[0075] 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.

[0076] 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 can be short cotton fibers with an average length of 4mm and an average diameter of 20μm.

[0077] (2) Main experimental instruments

[0078] Digital constant temperature water bath box; three-neck round bottom flask (500mL); analytical balance; thermometer;...

Embodiment 2

[0104] The solid-free drilling fluid system is constructed as follows:

[0105] Water+1%~2.5%GFJ-1+0.4%KPAM+1.0%~2.0%CMJ-1+2%~4%SPNH+1%~3%CMS.

[0106] Potassium polyacrylate KPAM performance indicators: appearance, white or light yellow free-flowing powder; moisture, ≤10.0%; purity, ≥75%; sieve residue, ≤10%; degree of hydrolysis, 27% to 35%; potassium content, 11 %~16%; pH value, 8.0~10.0; intrinsic viscosity, 100ml / g≥6.0;

[0107] Film-forming agent CMJ-1 performance indicators: appearance, white emulsion; API fluid loss ≤ 15.0ml; penetration, ≤ 0.5mm; particle size D after 150℃ / 16h hot rolling 50 , ≤0.9μm;

[0108] Lignite resin SPNH performance indicators: appearance, dark brown powder; moisture, ≤18%; water insoluble matter, ≤12%; pH value, 9.0~10.2;

[0109] Carboxymethyl starch CMS performance indicators: appearance, white or yellowish solid powder; degree of substitution (D.S) ≥ 0.2; pH value, 9-13; loss on drying, ≥ 10%; fineness (mesh) ≥ 80.

[0110] The prepara...

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Abstract

The invention provides a solid-free drilling fluid, comprising a plugging and anti-slump inhibitor, a stabilizer, a viscosifier, a film-forming agent, a fluid loss reducer and water; the plugging and anti-slump inhibitor is composed of polymeric alcohol and The granular lost circulation plugging material modified by dimethyl dienyl ammonium chloride and the fibrous lost circulation material are obtained; the granular lost circulation plugging material includes fruit shell. Compared with the prior art, the plugging and anti-slump inhibitor used in the present invention utilizes the unique "cloud point" effect of polyalcohol to form an effective isolation film on the surface of the borehole wall to block the channel for drilling fluid to penetrate into the formation. The shell and fibers form a complex network structure, which reduces the depth of drilling fluid invasion into the formation; at the same time, the reaction between dimethyl dienyl ammonium chloride and polymer alcohol produces a synergistic effect to enhance the inhibition and dispersion of the system and achieve effective stability The effect of the well wall; combined with other additives, the drilling fluid system has high rheology, fluid loss and inhibition, and the system has a simple formula and is convenient for preparation and maintenance.

Description

technical field [0001] The invention belongs to the technical field of coal bed gas exploitation, and in particular relates to a solid-phase-free drilling fluid, its preparation method and application. Background technique [0002] Coalbed methane (commonly known as gas) is a kind of unconventional natural gas resource that mainly occurs in coal seams in an adsorbed state, and is an important supplement to conventional energy in the world. Exploration and development of coalbed methane is of great significance to alleviating the tense demand for clean energy in my country, improving the level of prevention of gas accidents, and reducing greenhouse gas emissions. However, compared with foreign coalbed methane reservoirs, my country's coalbed methane reservoirs have the "three lows" characteristics of low permeability, low pressure, and low gas saturation, and most of the reservoir sections have complex coal structures with multiple coal seams. Reservoirs are vulnerable to dam...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/12
CPCC09K8/12C09K2208/04C09K2208/08C09K2208/12
Inventor 马腾飞王力孙晗森孙建平张守仁程璐李志勇马洪涛赵俊侯岩波王家鹏
Owner CHINA UNITED COALBED METHANE
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