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Upper stratum anti-collapse drilling fluid and preparation method thereof

A drilling fluid and anti-slump technology, applied in chemical instruments and methods, drilling compositions, reagents, etc., can solve the problems of poor plugging inhibition ability and poor effect of low free water drilling fluid, and achieve convenient preparation and maintenance. , Low filtration loss, strong inhibitory effect

Active Publication Date: 2021-02-19
CHINA UNITED COALBED METHANE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This system is mostly used in sand-shale interbedded well sections of East China Sea oil and gas fields to deal with the plugging and anti-collapsing of brittle high water-sensitive shale well sections, but the effect is poor in the actual application process, and tripping still occurs in the actual application process on site Occurrence of resistance and holding torque, etc., proves that low free water drilling fluid has poor plugging and inhibition ability.

Method used

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  • Upper stratum anti-collapse drilling fluid and preparation method thereof
  • Upper stratum anti-collapse drilling fluid and preparation method thereof
  • Upper stratum anti-collapse drilling fluid and preparation method thereof

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preparation example Construction

[0046] 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.

[0047] 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.

[0048] 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

[0067] (1) Experimental materials and reagents

[0068] 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.

[0069] 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.

[0070] (2) Main experimental instruments

[0071] Digital constant temperature water bath box; three-neck round bottom flask (500mL); analytical balance; thermometer;...

Embodiment 2

[0099] The upper formation anti-collapse drilling fluid system is constructed as follows:

[0100] 4% sodium soil + 1% plugging and anti-slump inhibitor GFJ (prepared in Example 1) + 1% ammonium salt + 2% carboxymethyl starch CMS + 0.4% potassium polyacrylate KPAM.

[0101] Plugging and anti-slump inhibitor GFJ performance indicators: API fluid loss: 12.4ml; penetration: 0.23mm; particle size after hot rolling: 0.38μm; (API fluid loss is added to 4% bentonite slurry with 1% GFJ, Follow the laboratory standard GB / T29170-2012. The needle penetration is measured by the SZR-3 needle penetration tester, and the particle size after hot rolling is the D50 data of the laser particle size distribution tester)

[0102] 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...

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Abstract

The invention provides an upper stratum anti-collapse drilling fluid, which comprises a plugging anti-collapse inhibitor, a stabilizer, a tackifier and water, wherein the plugging anti-collapse inhibitor is obtained by modifying a granular plugging material and a fibrous plugging material with polymeric alcohol and dimethyl dienyl ammonium chloride; and the granular plugging material comprises fruit shells. Compared with the prior art, the plugging anti-collapse inhibitor has the advantages that a layer of effective isolating membrane is formed on the surface of the well wall by utilizing thespecific cloud point effect of polymeric alcohol, a channel for drilling fluid to permeate into a stratum is blocked, shells and fibers are added to form a complex net-shaped structure, and the depthof the drilling fluid invading into the stratum is reduced; meanwhile, dimethyl diallyl ammonium chloride and polymeric alcohol react to generate a synergistic effect to enhance the inhibition and dispersity of the system, so that the effect of effectively stabilizing the well wall is achieved; and the stabilizer and the tackifier are combined, so that the drilling fluid system is low in filter loss, high in inhibition property and capable of effectively preventing stratum instability. In addition, the system is simple in formula, and the preparation and maintenance are convenient.

Description

technical field [0001] The invention belongs to the technical field of coal bed gas exploitation, and in particular relates to an upper formation anti-collapse drilling fluid and a preparation method thereof. Background technique [0002] Coalbed methane is the natural gas stored in the pores of coal seams in the state of adsorption and dissociation. my country is rich in coalbed methane resources, so the country is currently vigorously exploring and developing coalbed methane. In the mining process of coalbed methane, drilling engineering is the most critical technology. [0003] There are certain differences in the process of coal seam drilling compared with conventional formation drilling. The cap rock covering the upper part of the coal seam is mainly composed of mud shale. After the drilling fluid filtrate invades, the mud shale will produce local hydration phenomenon, which will cause hydration expansion or dispersion of rock at the well wall. Hydration expansion me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24C09K8/508C09K8/514
CPCC09K8/24C09K8/5086C09K8/514C09K2208/08Y02P20/141
Inventor 孙晗森张守仁马腾飞马洪涛夏日桂李志勇高计县张坤苏羽刘畅
Owner CHINA UNITED COALBED METHANE
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