Browse Prior Art Database

Hydrate Unblocking Logic Cap (HULC) Disclosure Number: IPCOM000240883D
Publication Date: 2015-Mar-09
Document File: 2 page(s) / 226K

Publishing Venue

The Prior Art Database


Subsea production systems often require the use of chemicals to address concerns regarding corrosion, scale, and hydrates. These chemicals are delivered from the host facility to the production well stream through a network of tubes running through umbilicals, distribution units, and flying leads. Although there are valves located on the subsea tree controlling and isolating the chemicals from the production well stream, they can often leak and allow production fluids to migrate back into the chemical injection tubes. If conditions are right, hydrates can form and block the chemical injection tubing. Losing the ability to inject chemicals could lead to corrosion of subsea facilities and significant integrity exposure. A common practice is to dissociate hydrate through depressurization, but this may be difficult in deep water applications due to hydrostatic pressure from the chemical in the tube.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 63% of the total text.

Page 01 of 2


Subsea pro

hydrates. T

tubes runn

subsea tre production

block the c

and signifi may be dif

Novel Idea


entire tube

which is re

to lower t Quick Con open the b

designed s

dissociatin HULC is re

surface, hy

hydraulic c

utilizing th



duction syste hese chemica

ing through u

e controlling a

fluids to mig hemical inject

cant integrity ficult in deep w

on the locat

of liquid with

ferred to here

he pressure in

nect (MQC) pl locked tube t

uch that down

g the hydrate moved and t

drocarbons ar

ontrols interfa

e particular su

ms often requ

ls are delivere

mbilicals, dist

nd isolating th

rate back into ion tubing. Lo exposure. A co

ater applicati

ion of the hyd

a gas. This c

as a Hydrate

the tubing b

ate which allo

o a bottle wh

time can be and continuit he subsea tre

e likely to be ce on the sub pplier's MQC d

ire the use of d from the ho

ribution units

e chemicals fr

the chemical sing the ability

mmon practic

ons due to the

rate blockage

an be accomp Unblocking Log

elow the hydr

ws it to conne

ich is deploye

minimized by y can be chec e controls are

present in the

sea tree can va


chemicals to a

st facility to th

, and flying le

om the produ injection tube

to inject chem

e is to dissoc

hydrostatic p

, local depres

lished with a t

ic Cap (HULC)

ate curve. It i

ct to the bloc

d to the seab

allowing the s

ked while the

returned to

bottle, but ca

ry depending

ddress concer

e production ads. Although uction well stre

s. If conditions

icals cou...