【摘要】：TW氣田P組氣藏為典型的低滲透砂巖氣藏。近年來隨著低滲油氣資源在海上新增油氣資源中所占比例逐漸增大,水力壓裂等增產改造措施已經成為海上油氣開發(fā)必須面臨的技術問題。TW氣田水力壓裂面臨壓裂材料性能要求高、施工環(huán)境特殊和可借鑒的經驗少等問題,加上海上壓裂技術和設備的限制,導致現(xiàn)TW氣田壓裂工藝技術的應用還未達預期。本文針對TW氣田P組氣藏壓裂存在的難點,采取資料調研、室內實驗和現(xiàn)場試驗等手段,對壓裂工程地質、壓裂液、支撐劑和壓裂工藝等進行了研究,取得如下成果。①通過地質資料分析及室內實驗可知,TW氣田P組氣藏屬于高豐度中孔低滲氣藏,目的層存在極強水敏、中等堿敏和中等水鎖,同時產凝析油,地層溫度可達135℃;②針對TW氣田P組儲層地質特征,經過主劑和添加劑優(yōu)選,最終確定配方為0.55%HPG+1%G513-WDJ+0.5%G517-XZ+0.5%YL-11-1%KCl+0.2%YW-1+0.1%Na2CO3 +0.5%CQL-2+0.1%CJSJ-2+1%G514-SCJ+清水的壓裂液體系,壓裂液體系具有良好的配伍性、抗溫抗剪切性,低濾失、低殘渣、高防膨,且破膠濾液低張力,對P組儲層傷害率為17.7%；③通過技術調研分析并結合TW氣田P組儲層地質特征,選擇燒結陶粒作為該地區(qū)儲層改造的支撐劑類型,圣戈班陶粒性價比較高,30/50目和20/40目兩種規(guī)格的圣戈班陶粒均具有良好的物理性能,在高閉合壓力下能夠保持較好的導流能力,能夠滿足不同工藝要求對支撐劑的需要;④從儲層改造角度,將TW氣田P組儲層分成三類,對三類儲層進行了壓裂縫長、導流能力、施工參數(shù)的優(yōu)化,獲得了不同儲層對應的最優(yōu)縫長、導流能力和施工參數(shù),為單井優(yōu)化設計提供了參考依據(jù)；⑤對比壓裂船壓裂和平臺壓裂兩種壓裂方式,認為兩種壓裂方式各有優(yōu)缺點；通過對國內外常用排液技術分析,在滿足海上低滲儲層的施工條件下,伴注液氮、氣舉閥氣舉、連續(xù)油管氣舉等方法進行壓后助排,可以達到較好的返排效果。從現(xiàn)場應用來看,A6井現(xiàn)場壓裂施工壓力平穩(wěn),加砂順利,按照設計完成了加砂量,達到了設計要求,施工過程中壓裂液交聯(lián)情況良好,耐溫性高,攜砂性能良好,滿足了現(xiàn)場施工的需求,累計排出地層液體175.6m3,返排率82.5%,返排效果較好,壓后測試產氣量1.5×104m3/d～2×104m3/d之間波動。同時,A6井首次采用完井階段直接壓裂然后投產的思路,是一次有益的探索,為今后類似井的完井增產一體化提供了參考和依據(jù)。
[Abstract]:P formation gas reservoir in TW gas field is a typical low permeability sandstone gas reservoir. In recent years, with the increasing proportion of low permeability oil and gas resources in the new offshore oil and gas resources, Hydraulic fracturing and other measures to increase production have become technical problems that must be faced in offshore oil and gas development. Hydraulic fracturing in TW gas field is faced with high requirements for fracturing material performance, special operating environment and less experience to be used for reference. Combined with the limitation of offshore fracturing technology and equipment, the application of fracturing technology in TW gas field is not up to expectations. In this paper, the fracturing engineering geology, fracturing fluid, proppant and fracturing technology of P group gas reservoir in TW gas field are studied by means of data investigation, laboratory experiment and field test. The results are as follows: 1 through the analysis of geological data and laboratory experiments, it can be seen that P gas reservoirs in TW gas field belong to high abundance, medium porosity and low permeability gas reservoirs, and there are very strong water sensitivity, medium alkali sensitivity and moderate water locks in the target layer, and condensate oil is produced at the same time. Formation temperature can reach 135 鈩，

本文編號：2354060