CN-121993032-A - Shale oil horizontal well aggressive drilling method

CN121993032ACN 121993032 ACN121993032 ACN 121993032ACN-121993032-A

Abstract

The invention relates to the technical field of oil and gas well drilling and completion engineering design and construction, in particular to a shale oil horizontal well aggressive drilling method which comprises the steps of measuring an actual torsion value of a drill rod, setting a safety coefficient, determining the maximum allowable torque T of the drill rod, selecting a drilling tool, adjusting aggressive drilling parameters so that the actual torque of the drill rod is close to and does not exceed the maximum allowable torque T, completing aggressive drilling, pulling out the drill, adjusting the safety coefficient when the next aggressive drilling is carried out, and repeating the steps. Through the aggressive drilling method, the service life of the shale oil horizontal well drilling tool can be effectively prolonged, and the high-efficiency development efficiency of the horizontal well can be ensured.

Inventors

XU CHAOYANG
WANG PEIFENG
GAO YONGWEI
YANG XIAOFENG
LI YANZE
CHEN CAIZHENG
LI XIAOLI
ZHAO WENZHUANG
GUO BAILI
SHI CHONGDONG

Assignees

中国石油天然气集团有限公司
中国石油集团川庆钻探工程有限公司

Dates

Publication Date: 20260508
Application Date: 20241105

Claims (10)

1. A shale oil horizontal well aggressive drilling method is characterized by comprising the following steps: S 1 , measuring an actual torsion resistance T' of the drill rod; s 2 , setting a safety coefficient alpha, and determining the maximum allowable torque T of the drill rod: T=T′/α S 3 , selecting a drilling tool; S 4 , adjusting the aggressive drilling parameters so that the actual torque of the drill rod approaches and does not exceed the maximum allowable torque T; S 5 , completing the aggressive drilling and tripping; S 6 , when drilling is performed next time, adjusting the safety coefficient, and repeating the steps S 2 to S 5 , wherein the adjusted safety coefficient is as follows: α′=α-(n-1)β Wherein alpha' is the adjusted safety coefficient, alpha is the safety coefficient when the drilling tool is used for the first time, n is the number of times the drilling tool is used, and beta is the safety threshold.
2. The method for aggressive drilling of shale oil horizontal wells of claim 1, wherein said safety factor is determined based on measuring the outside diameter of the drill pipe joint during drilling.
3. The method for aggressive drilling of shale oil horizontal wells of claim 2, wherein said aggressive drilling parameters comprise wellhead rotation pressure and drill pipe rotation speed.
4. The method of drilling a shale oil horizontal well by pumping according to claim 3, further comprising pre-drilling a plurality of times in the drilling block when adjusting the pumping drilling parameters, and obtaining the correspondence between the pumping drilling parameters and the torque of the drill rod.
5. A shale oil horizontal well aggressive drilling method as in claim 3 wherein during aggressive drilling, wellhead rotation pressure and drill pipe rotation speed are reduced when the drill encounters a position 30-50m above the gravel layer.
6. The method for aggressive drilling of shale oil horizontal wells according to claim 5, wherein the shale oil horizontal wells are drilled through a gravel layer or a stratum with stronger abrasiveness for 10-20m, and the aggressive drilling parameters are restored, and the aggressive drilling is continued.
7. The shale oil horizontal well aggressive drilling method of any of claims 1-6, wherein the position of obvious damage of a drilling tool is determined in the process of tripping, and the use parameters of drilling tool entering a well are determined according to the damage condition of the drilling tool.
8. The shale oil horizontal well aggressive drilling method of any one of claims 1-6, wherein the method for measuring the actual torsion value of the drill rod is to randomly extract the drill rod to carry out an overload trip experiment to obtain the actual maximum trip torque, namely the actual torsion value of the drill rod.
9. The method for aggressive drilling of shale oil horizontal wells of claim 8, wherein at least two drill rods are randomly extracted while measuring the actual torsion value of the drill rods.
10. The method for drilling shale oil horizontal well in an aggressive manner according to any of claims 1-6, wherein the drilling tool structure is subjected to a weak torque on the drill pipe during drilling tool selection.

Description

Shale oil horizontal well aggressive drilling method Technical Field The invention relates to the technical field of oil and gas well drilling and completion engineering design and construction, in particular to a shale oil horizontal well aggressive drilling method. Background In the existing shale gas development, by means of an advanced accelerating tool and through strengthening drilling measures, the drilling speed is greatly improved by adopting aggressive drilling. The aggressive drilling well is to fully develop the accelerating potential of each link of drilling construction, adopts the drilling modes of large bit pressure, high rotation speed, large discharge capacity and high pump pressure, and fully develops the functions of a drill bit, a screw rod, a drill collar, a drill rod, a centralizer and a pump to the upper limit so as to achieve the aim of improving the mechanical drilling speed. Aiming at the underground safety problem in the aggressive drilling process, firstly, aiming at the technical difficulties of poor adaptability of PDC drill bits, high control difficulty of well tracks, poor stability of shale reservoir walls and the like of shale oil horizontal wells in different areas, the aggressive parameter drilling is promoted, the drilling tool combination is optimized, the personalized design of the PDC drill bits is developed, and a drilling fluid system is optimized. The method comprises the steps of establishing a data model for optimizing a real-drilling high-efficiency drill bit according to the mineral composition of a drilling stratum, physical and chemical properties, three-pressure profile, stratum drillability and other engineering geological feature analysis, determining the type of the drill bit used in each well section, analyzing the application condition of drilling parameters through software simulation, determining the aggressive drilling parameter schemes of different wells, and optimizing polyamine drilling fluid system optimization through indoor evaluation and field test to ensure the stability of the mudstone well wall. And thirdly, combining a screw drilling tool and a PDC drill bit selection series which are preferably matched and suitable for different well types, different wellbores and different intervals to accelerate and improve the efficiency, carrying out large-displacement, large-weight and high-rotation speed aggressive drilling field tests based on theoretical knowledge of improving the mechanical drilling speed by the maximum well bottom overflow speed and analysis of sensitivity of weight/rotation speed to the mechanical drilling speed, establishing aggressive drilling parameter templates of different well types and different well intervals, and realizing large-scale acceleration of the same area. Fourthly, the efficient development technology integration suitable for Jiangsu oilfield is formed according to series technologies such as a well factory mode, an integral optimization design technology, a well structure optimization technology, a preferable personalized PDC drill bit, a long-service-life equal-wall-thickness screw rod, a high-pressure injection technology, a complex well track friction reduction and drag reduction, an environment-friendly starch-based drilling fluid system and the like. Fifthly, research on 'factorial' horizontal well drilling mode optimization, 'efficient PDC drill bit and high-power screw rod' aggressive parameter drilling technology, different offset well track control mode optimization, strong inhibition low-density CQSP-4 collapse prevention drilling fluid subsection optimization and the like is carried out. The method and the measure are mainly proposed from the aspects of drilling stratum analysis, drilling fluid optimization, PDC drill bit personalized design, screw optimization and the like aiming at the shale oil horizontal well aggressive drilling problem through the data review analysis, and the downhole safety of the drilling tool is not systematically analyzed. Disclosure of Invention In order to solve the technical problems, the invention provides a shale oil horizontal well aggressive drilling method which can effectively prolong the service life of a shale oil horizontal well drilling tool and ensure the high-efficiency development efficiency of the horizontal well. The invention is realized by adopting the following technical scheme: a shale oil horizontal well aggressive drilling method comprising the steps of: S 1, measuring an actual torsion resistance T' of the drill rod; s 2, setting a safety coefficient alpha, and determining the maximum allowable torque T of the drill rod: T=T′/α S 3, selecting a drilling tool; S 4, adjusting the aggressive drilling parameters so that the actual torque of the drill rod approaches and does not exceed the maximum allowable torque T; S 5, completing the aggressive drilling and tripping; S 6, when drilling is performed next time, adjusting the safety coefficient, and