新疆塔河油田1区低含水期稳油控水效果分析

当油井生产形成压力降落大于油水密度差引起的重力差时，砂岩底水油藏锥进即会发生。塔河油田1区通过采取已有直井减小油嘴以降低生产压差约0．25MPa、新投产直井选用小油嘴工作制度、高含水井关井压锥、水平井陆续投产及TKl06H、TKl08H以略低于临界产量方式生产等措施，使油藏达到降低水油比、产量递减变慢目的，从而在低含水阶段末，采出程度达到4．85％，远高于采取控水措施较少的2区三叠系中油组的0．5％，起到稳油控水、提高最终采收率作用。

THE EFFECT ANALYSIS OF CONING WATER AT THE LOW-WATER-CUT PERIOD IN TAHE OILFIELD OF XINJIANG

The coning of bottom water will happen as soon as the producing pressure drop of a well is higher than the difference of gravity caused by the difference of density between oil and water. So many effective measures to control the producing pressure drop in Block 1 of the Tahe oilfield have been taken to make the reservoir drop the cumulative water oil ratio and lower the decline rate of oil production. These measures include that vertical wells were reduced chokes to drop producing pressure drop by 2.5 MPa or so, that little diameter chokes were used in the wells put into production, that the well during high water cut period was closed, that the horizontal wells were put into production one by one, and that the wells of TK106H and TK108H were produced by controlling the production lower than their critical rates. Therefore , the result of controlling bottom water measures is that the recovery at end of the low water cut period reached 4.85 percent in Block 1 of the Tahe oilfield. It is more higher than that of 0.55 percent in Block 2 of the Tahe oilfield. So the reservoir is closed to reach the aim of coning water and the ultimate recovery factor is improved.