Lost circulation Materrial

The uniaxial pressure blocking agent is consisted of flowable,varied fibre granules.These granules become a cushionlike layer under the positive direction pressure when they come into the stratum.The cushionlike layer covered on the surface of the penertrated stratum,which reduce the space in the stratum and block the pass of the well-drilling filtrate and clay granules. Technique target administer Q/MHXH08—2008.

Technique demand

Diagram 1 Physical and chemical target


Program
Target

Appearance
Yellow solid powder

degree of fineness(20 target passing)，% ≤
10

PH values
7～8

Liquid water content % ≤
8




Diagram 2 Well-drilling liquid performance target


Program

density
g /cm3
Apparent viscosity
mpa·s
Plastic viscositympa·s
Filter loss ml(30min)
Closed filter loss

ml
PH

Curd
1.01～1.03
7～8
5～6
18～21
0（1 min）
9～10

Curd +4% sample
≤1.03
6～9
4～7
≤16
≤40 (30 min)
9～10