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Performance studies of water-based drilling fluid for drilling through hydrate bearing sediments
Applied Clay Science ( IF 5.3 ) Pub Date : 2018-02-01 , DOI: 10.1016/j.clay.2017.11.014
Madhukar Srungavarapu , Krishan Kumar Patidar , Akhilendra Kumar Pathak , Ajay Mandal

Abstract Hydrate-bearing formation is a highly unconsolidated formation and being fragile, the hydrates get readily decomposed while drilling through it. To successfully drill through the hydrates, the drilling fluid should have low mud invasion, exhibit optimum properties for wellbore stability, prevent the formation of the hydrates in the annulus, choke lines, etc. Initial experiments were performed with the drilling fluid with the composition as artificial seawater, 3.0 wt% bentonite, 3.0 wt% barite, and 0.3 wt% carboxymethyl cellulose (CMC) (wt%). The rheological, filtration and gelling properties were determined. The synergistic effects of xanthan gum (XG) and CMC with different compositions were used to study rheological properties. The drilling fluid with desirable rheological properties was further studied at low temperatures and at high pressures. The drilling fluid was tested for hydrate inhibiting properties in a high-pressure autoclave vessel at 16.55 MPa and at 0 °C and further tested with increasing water cut at both static and dynamic conditions. The experimental results reveal that XG has better viscosifying properties while CMC has a better filtration loss properties. With the increase in the concentration of the both CMC and XG, there has been an increase in viscosity, yield point, gel strength and decrease in the filtration loss. The experimental results also show that the developed drilling fluid has good inhibiting properties under static conditions but with an increase in water cut the risk of formation of hydrates increases.

中文翻译:

水基钻井液钻穿含水合物沉积物的性能研究

摘要 含水合物地层是一种高度松散的地层,地层脆弱,在钻进过程中容易分解水合物。为了成功钻穿水合物,钻井液应该具有低泥浆侵入性,表现出井眼稳定性的最佳性能,防止在环空、阻塞线等中形成水合物。 用具有以下成分的钻井液进行初步实验人造海水、3.0wt%膨润土、3.0wt%重晶石和0.3wt%羧甲基纤维素(CMC)(wt%)。测定流变、过滤和胶凝性能。黄原胶 (XG) 和 CMC 具有不同组成的协同作用被用来研究流变特性。在低温和高压下进一步研究了具有理想流变特性的钻井液。在 16.55 MPa 和 0 °C 的高压高压釜中测试钻井液的水合物抑制性能,并在静态和动态条件下进一步测试增加含水量。实验结果表明,XG 具有更好的增粘性能,而 CMC 具有更好的滤失性能。随着 CMC 和 XG 浓度的增加,粘度、屈服点、凝胶强度增加,滤失量减少。实验结果还表明,所开发的钻井液在静态条件下具有良好的抑制性能,但随着含水量的增加,形成水合物的风险增加。在 16.55 MPa 和 0 °C 的高压高压釜中测试钻井液的水合物抑制性能,并在静态和动态条件下进一步测试增加含水量。实验结果表明,XG 具有更好的增粘性能,而 CMC 具有更好的滤失性能。随着 CMC 和 XG 浓度的增加,粘度、屈服点、凝胶强度增加,滤失量减少。实验结果还表明,所开发的钻井液在静态条件下具有良好的抑制性能,但随着含水量的增加,形成水合物的风险增加。在 16.55 MPa 和 0 °C 的高压高压釜中测试钻井液的水合物抑制性能,并在静态和动态条件下进一步测试增加含水量。实验结果表明,XG 具有更好的增粘性能,而 CMC 具有更好的滤失性能。随着 CMC 和 XG 浓度的增加,粘度、屈服点、凝胶强度增加,滤失量减少。实验结果还表明,所开发的钻井液在静态条件下具有良好的抑制性能,但随着含水量的增加,形成水合物的风险增加。55 MPa 和 0 °C,并在静态和动态条件下进一步测试增加含水量。实验结果表明,XG 具有更好的增粘性能,而 CMC 具有更好的滤失性能。随着 CMC 和 XG 浓度的增加,粘度、屈服点、凝胶强度增加,滤失量减少。实验结果还表明,所开发的钻井液在静态条件下具有良好的抑制性能,但随着含水量的增加,形成水合物的风险增加。55 MPa 和 0 °C,并在静态和动态条件下进一步测试增加含水量。实验结果表明,XG 具有更好的增粘性能,而 CMC 具有更好的滤失性能。随着 CMC 和 XG 浓度的增加,粘度、屈服点、凝胶强度增加,滤失量减少。实验结果还表明,所开发的钻井液在静态条件下具有良好的抑制性能,但随着含水量的增加,形成水合物的风险增加。屈服点、凝胶强度和过滤损失的降低。实验结果还表明,所开发的钻井液在静态条件下具有良好的抑制性能,但随着含水量的增加,形成水合物的风险增加。屈服点、凝胶强度和过滤损失的降低。实验结果还表明,所开发的钻井液在静态条件下具有良好的抑制性能,但随着含水量的增加,形成水合物的风险增加。
更新日期:2018-02-01
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