PATENT CLAIM ANALYSIS

Application Number: 15952917
Application Type: Utility
Filing Date: 2018-04
Publication Date: 2019-08
Patent Classification: ["507", "109000"]

Abstract:
The present invention relates to the field of drilling fluids, and discloses a strong plugging drilling fluid suitable for shale gas wells and a preparation method of the drilling fluid. The drilling fluid contains water, bentonite, a tackifier, a flow pattern regulator, a filtrate reducer, a plugging agent, and a weighting agent, wherein, based on 100 parts by weight of water, the content of the bentonite is 1-10 parts by weight, the content of the tackifier is 5-15 parts by weight, the content of the flow pattern regulator is 4-13 parts by weight, the content of the filtrate reducer is 4-13 parts by weight, the content of the plugging agent is 20-55 parts by weight, and the content of the weighting agent is 10-60 parts by weight; the drilling fluid provided in the present invention employs modified nano-silica as a plugging agent to improve dispersity and particle size distribution in the drilling fluid system. Therefore, the drilling fluid is especially suitable for well drilling in shale formations with developed micro-fractures (micro-fissures) and micro-pores, low porosity and low permeability (10 −3 -10 −7  md), and prominent capillary effect.

Claim (Index 1):
A strong plugging drilling fluid suitable for shale gas wells, the strong plugging drilling fluid consisting of:\n water, bentonite, a tackifier, a flow pattern regulator, a filtrate reducer, a plugging agent, and a weighting agent, wherein, based on 100 parts by weight of water, the content of the bentonite is 1-10 parts by weight, the content of the tackifier is 5-15 parts by weight, the content of the flow pattern regulator is 4-13 parts by weight, the content of the filtrate reducer is 4-13 parts by weight, the content of the plugging agent is 20-55 parts by weight, and the content of the weighting agent is 10-60 parts by weight; wherein the plugging agent is modified nano-silica, the modified nano-silica is in a primary mono-dispersed structure and the particle diameter of the modified nano-silica is 25-70 nm; and wherein the tackifier is hydroxyethyl cellulose; the flow pattern regulator is sodium acrylate; the filtrate reducer is lignite resin; and the weighting agent is iron ore powder.

Metadata:
- Claim Count in Document: 14.0
- Percentile: 91.0
- Lexical Diversity: 2.50588
- Patent Class: 507.0
- Transitional Phrase Type: closed
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['15952880', '14871610', '15809707', '15795799', '15809590']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7962003775158757
- 35 USC 102 Novelty (BERT): 0.5111681166744619
- Combined Prediction Score: 0.7676971514317343
- Mean Citation Score: 271.40163199999995
- Max Citation Score: 310.9713700000001
- Similarity Product: 230.27340148494253

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 0
- Claim Label 112: 1
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test