127-11-90-70

Sand control is an urgent difficulty needed to be solved during the process of oil recovery. There are two main methods used in sand control program currently, the mechanical Sand control and the chemical sand control, which have achieved good results and exposed some shortcomings either. Aiming to such problems, series of sand control perforating charges have been designed and produced in our company to do the perforating job and control sanding at the same time, including 2 categories

1.High Shot Density Sand Control Charge

Features and application

    The production capacity of oil and gas well increases with shot density, particularly when the reservoir is polluted slightly and cemented loosely, high shot density will contribute highly to the production capacity. High shot density can provide larger fluid flow channel to reduce flow resistance, effectively increase the draining flow area in borehole, reduce fluid flow rate, reduce sand-carrying, then to win higher output rate, reduce sand output and achieve the purpose of controlling sand and improving production.

    High shot density serial charges apply to perforating operation in all operation blocks, broadened the ideas of sand control. It can bring us such benefits: effectively avoid well overhaul and large-scale sand control caused by sand burying and sand blocking; avoid reservoir pollution caused by frequent operation, extend oil production cycle, reduce operating costs, meet the perforating needs in different strata and different reservoirs, enhance production capacity of oil and gas, effectively control sand output. Overall, the prospect is promising.

2. Cramming Sand Control Shaped Charge

a Principle

1 The process of firing and perforating is within microsecond, a very short time.

2 It will produce a negative pressure area in the end of high pressure and high speed jet, drawing the steel wire ball to follow it into tunnel.

3 At the same time when the charges are perforated, the remaining energy of main loading explosives in charges ignites the firing explosives through the firing system installed in the launching capsule, producing great force to push the steel wire balls flying toward the hole, entering into the tunnel.

b Features

Fillings can remain in the tunnels. When the fillings enter into holes, the running liquid will draw the steel wire balls along the tunnel, its strength is not big enough to pull the steel wire balls out of the tunnel for the following 3 main reasons:

1 All the steel wire balls are winded, which can be pulled by the burrs outside the casing.

2 After perforating, tunnels are rough enough to prevent the steel wire nets moving to the entrance.

3 For sand filling and pushing, the steel wire nets will expand in the tunnel.