【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(chǎn)改造措施已經(jīng)成為海上油氣開發(fā)必須面臨的技術(shù)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(jīng)驗(yàn)少等問題,加上海上壓裂技術(shù)和設(shè)備的限制,導(dǎo)致現(xiàn)TW氣田壓裂工藝技術(shù)的應(yīng)用還未達(dá)預(yù)期。本文針對(duì)TW氣田P組氣藏壓裂存在的難點(diǎn),采取資料調(diào)研、室內(nèi)實(shí)驗(yàn)和現(xiàn)場(chǎng)試驗(yàn)等手段,對(duì)壓裂工程地質(zhì)、壓裂液、支撐劑和壓裂工藝等進(jìn)行了研究,取得如下成果。①通過地質(zhì)資料分析及室內(nèi)實(shí)驗(yàn)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(qiáng)水敏、中等堿敏和中等水鎖,同時(shí)產(chǎn)凝析油,地層溫度可達(dá)135℃;②針對(duì)TW氣田P組儲(chǔ)層地質(zhì)特征,經(jīng)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?jiān)⒏叻琅?且破膠濾液低張力,對(duì)P組儲(chǔ)層傷害率為17.7%；③通過技術(shù)調(diào)研分析并結(jié)合TW氣田P組儲(chǔ)層地質(zhì)特征,選擇燒結(jié)陶粒作為該地區(qū)儲(chǔ)層改造的支撐劑類型,圣戈班陶粒性價(jià)比較高,30/50目和20/40目?jī)煞N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(dǎo)流能力,能夠滿足不同工藝要求對(duì)支撐劑的需要;④從儲(chǔ)層改造角度,將TW氣田P組儲(chǔ)層分成三類,對(duì)三類儲(chǔ)層進(jìn)行了壓裂縫長(zhǎng)、導(dǎo)流能力、施工參數(shù)的優(yōu)化,獲得了不同儲(chǔ)層對(duì)應(yīng)的最優(yōu)縫長(zhǎng)、導(dǎo)流能力和施工參數(shù),為單井優(yōu)化設(shè)計(jì)提供了參考依據(jù)；⑤對(duì)比壓裂船壓裂和平臺(tái)壓裂兩種壓裂方式,認(rèn)為兩種壓裂方式各有優(yōu)缺點(diǎn)；通過對(duì)國(guó)內(nèi)外常用排液技術(shù)分析,在滿足海上低滲儲(chǔ)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(jìn)行壓后助排,可以達(dá)到較好的返排效果。從現(xiàn)場(chǎng)應(yīng)用來看,A6井現(xiàn)場(chǎng)壓裂施工壓力平穩(wěn),加砂順利,按照設(shè)計(jì)完成了加砂量,達(dá)到了設(shè)計(jì)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(chǎng)施工的需求,累計(jì)排出地層液體175.6m3,返排率82.5%,返排效果較好,壓后測(cè)試產(chǎn)氣量1.5×104m3/d～2×104m3/d之間波動(dòng)。同時(shí),A6井首次采用完井階段直接壓裂然后投產(chǎn)的思路,是一次有益的探索,為今后類似井的完井增產(chǎn)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(hào)：2354059