Victory Chengdao Oilfield Sand Control Technology Research

Sand control technology for Sheng li cheng dao offshore oilfield is raised to ensure that the Chengdao oilfield is successfully exploited and the wells are smoothly produced. The present situation and technology of sand control for offshore oil wells here and abroad is introduced in this paper. The wells in Chengdao reservoir must be sand controled during production process, which has been proved by analyzing the physical characteristics of Guantao formation, the fluids in zone and researching the mechanics and rules of sand production and predicting the sand production extent. Three kinds of sand control pipes and KQA hollow bridge plug or sand control packer have been developed, through-tubing sand control technology was put forward as an economical and feasible sand control method suitable for the wells in which the casings are deformed according to calculation.The sand-control techniques of wire-wrapped screen with gravel pack, pre-packed screen , metal-fiber screens and chemical have been selected for use based on the sand control features for offshore wells and actual characteristics of shengli oilfield.. The compatible technology and the formation protection technology for offshore sand control were researched, too. Those technologies were applied to Chengdao reservoir for 249 jobs from September, 2001 to March, 2004, and the success rate arrived to 98.8 % with sand cut below 0.01% by the oil sample analysis, and the wells have worked well with average daily fluid rate of 66.77t/d, average fluid production strength of 4.48t/m.d each well. And the total oil produced is up to 2,340,000t. With great economic and social benefit. It makes the sand control for offshore reservoir come true in China, which has filled up the domestic blank and plays a very important rule in stabilizing oil production of Shengli oilfield.