Bit stick-out calculation for the deepwater conductor jetting technique

Model and experimental study on jetting flow rate for installing surface conductor in deep-water

Study on the penetration of strengthening material for deep-water weakly consolidated shallow formation

Risk assessment of surface conductor jetting installation during deep-water drilling in sloping seabed

\n Drill-conductor-jetting technology is a high-efficiency, good-adaptability, and low-cost technology that has been widely applied in deepwater drilling. However, a reaming effect will be produced easily because of jet breaking and bit rotation during the jetting process, and the critical displacement would be notably affected. Also, it will experience a relatively short soaking time after installation because of the requirements of drilling timeliness, which is an important factor on the bearing safety of a conductor. Therefore, it is meaningful to study the influencing factors of construction conditions and establish a model for evaluating the value of critical displacement. In this study, field experiments on critical displacement for simulating the deepwater-drilling conditions were conducted. By analyzing the drilling hydraulic factors, the effects of soil-stress-recovery time, and the injection rate of pipe, the influence laws of different factors were obtained. The results suggest that the critical displacement increases linearly as the circulation rate of the drilling fluid increases, decreases exponentially with the increase of soil-stress-recovery time, and decreases linearly with the increase of injection rate. One model for estimating the critical displacement using experimental data and the least-squares method was proposed. The predictions showed good agreement with experimental data within suitable ranges of models. This work is expected to provide the basis for predicting conductor stability and wellhead-bearing settlement.

Experimental Study on Critical Displacement for Drill-Conductor Injection during Deepwater Drilling

The invention relates to a method for determining insertion depth of offshore self-elevating drilling platform piles into mud according to the factors of pile inserting and backfill in the pile area and a DRC model of the grouped pile effect factor. The method comprises the following steps: calculating the bearing capacity of the self-elevating drilling platform piles by adopting the DRC model: considering the influence of the dynamic load generated during the insertion of the self-elevating drilling platform piles to the insertion depth of the piles into the mud, the influence of the reflow of the earth on the upper parts of pile shoes inserted blow the mud surface to the insertion depth of the piles into the mud, and the grouped pile effect caused by the reason that a plurality of self-elevating drilling platform piles enter below the mud surface to affect one another and squeeze the earth; and finding the corresponding bearing capacity of the self-elevating drilling platform piles, which is equal to the insertion depth of the self-elevating drilling platform piles with the maximum preloading capacity, to obtain the insertion depth of the offshore self-elevating drilling platform piles into the mud. The method can be used for reasonably determining the insertion depth of the offshore self-elevating drilling platform piles into the mud.

Method for determining insertion depth of offshore self-elevating drilling platform piles into mud

The invention relates to a pile soil interaction mechanism testing device for a riser, which comprises a sealed cylinder, a sealed cover, an electric piston hoisting machine force transducer, a testing conduit, a plurality of strain force transducers, a liquid pressure gauge, a hydraulic pump and a control device, wherein the electric piston hoisting machine force transducer is connected with the testing conduit through a transverse lever and transmits the measured data to the control device; the strain force transducers are arranged at different heights at intervals on the outer wall of the testing guiding pipe which is covered by seafloor soil so as to detect the stresses on the testing conduit at different seawater depths and transmit the stresses to the control device in real time; the liquid pressure gauge is used for transmitting the acquired pressure information on the upper part of liquid to the control device in real time; the output end of the hydraulic pump is connected with a water inlet on the sealed cover through a hydraulic transmission pipe; the control device is electrically connected with the control end of the hydraulic pump; and a liquid pressure threshold computing module and a friction factor computing module for the control device to control the water depth in the sealed cylinder are pre-arranged in the control device The testing device can measure the action mechanism between the riser and the seafloor soil conveniently, quickly and accurately, and the reliability of the result is high

Pile soil interaction mechanism testing device for riser

The invention relates to a riser pipe shoe, which is characterized by comprising an integrally arranged main pipe body and transition pipe body, wherein the main pipe body is a cylinder which is formed by winding a circular arc wavelike plate; the internal diameter and the external diameter of the transition pipe body are correspondingly the same as the internal diameter and the external diameter of a riser pipe respectively; the external diameter of the main pipe body is consistent with the external diameter of the transition pipe body; one end of the main pipe body is a stratum penetration end, and the other end of the main pipe body is a connecting end with the transition pipe body; the wall thickness of the main pipe body is gradually thinned from the connecting end with a transition pipe body to the stratum penetration end; and a space with an inclination angle is formed in the main pipe body. The stratum penetration end of the main pipe body of the riser pipe shoe is thin, and the connecting end with the transition pipe body is thick, so that the main pipe body has stronger stratum penetration capacity; and the space of the inclination angle is formed in the main pipe body, so that a pile group effect can be reduced, and an area with dense riser pipes can be more conveniently descended. The riser pipe shoe can be widely applied to the field of various petroleum exploration and development.

Riser pipe shoe

The utility model relates to a waterproof conduit shoe with fast penetrability. The waterproof conduit shoe with the fast penetrability is characterized by comprising a conduit shoe body and a wedge-shaped structure which is integrally formed with the conduit shoe body, wherein the bottom of the wedge-shaped structure is arranged in a taper-angle mode, the angle of the taper angle is alpha, a plurality of conduit shoe teeth are arranged at intervals on the periphery of the wedge-shaped face of the lower end of the wedge-shaped structure, and a plurality of reinforcing ribs are further arranged at intervals from the upper middle portion of the conduit shoe body to the bottom end of the wedge-shaped structure along the peripheral axial direction of the conduit shoe body and the peripheral axial direction of the wedge-shaped structure. According to the waterproof conduit shoe with the fast penetrability, due to the facts that the conduit shoe body and the wedge-shaped structure which is integrally formed with the conduit shoe body are adopted and the bottom of the wedge-shaped structure is arranged in the taper-angle mode, after a soil plug is formed inside the conduit shoe, the conduit shoe serves as the wedge-shaped structure, the conduit shoe has good guiding performance during a piling process, and the penetrability of the conduit shoe can be effectively improved. The waterproof conduit shoe with the fast penetrability can be widely applied to the field of petroleum exploration and development and foundation construction of the building industry.

Waterproof conduit shoe with fast penetrability

The utility model relates to a drilling riser pipe side-directional friction-force measuring device under simulating high-pressure condition, which is characterized by comprising an inner hydraulic cylinder, wherein the inner hydraulic cylinder is suspended inside a high-pressure closed cylinder with water, the bottom part of a piston of the inner hydraulic cylinder is connected with a riser pipe to be tested through a hoisting rod, the side wall of the inner hydraulic cylinder and the upper and the lower sides of the piston of the inner hydraulic cylinder are respectively communicated outwards with a high-pressure transferring pipe, two high-pressure transferring pipes pass through the high-pressure closed cylinder to be connected with the position corresponding to an outer hydraulic cylinder, the top part of the outer hydraulic cylinder is provided with an electric transmission mechanism which drives a piston of the outer hydraulic cylinder, and the bottom part of the outer hydraulic cylinder is provided with a pressure meter. In the principle that the liquid cannot be compressed and according to the pressure transferring property of the liquid, the piston of the inner hydraulic cylinder is pushed to move upwards by pressing the outer hydraulic cylinder through the pressure transmission, the piston drives the pipe to be lifted upwards, and the lifting force can be extrapolated through the pressure meter on the outer hydraulic cylinder so as to obtain the value of the side-directional friction force of the riser pipe under the high-pressure condition.

Drilling riser pipe side-directional friction-force measuring device under simulating high-pressure condition

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