Technological method for drilling fluid solid control circulation system

Abstract

The invention relates to a technological method for a drilling fluid solid control circulation system, in particular to a technological method for the treatment of drilling fluid produced during oil and gas drilling. The technological method for the drilling fluid solid control circulation system adopts the following device components: a special concentration treatment device I, a special centrifugal machine, an oil field mud pump I, a special cyclone set I, a special concentration treatment device II, an oil field mud pump II, a special cyclone set II, a special concentration treatment device III, an oil field mud pump III, a storage box, an oil field mud pump IV, a special filter press (or a special stacked spirals), a solid-phase mud cake collection barrel (or a mud transfer tank), and a circulating fluid storage tank. The technological method for the drilling fluid solid control circulation system has the following benefits: desanding, mud removal, destabilization and gel breaking in a circulating and classification manner are achieved through the two-stage special cyclone sets, so that the classifying effect is remarkable; circulating concentration is achieved through the three-stage special concentration treatment devices, so that the concentration effect is remarkable; the treated drilling fluid is recycled; treated solid-phase mud cakes or highly-concentrated mud are / is directly transported away.

Description

technical field [0001] The invention relates to a process method of a drilling fluid solid control circulation system, in particular to a process method for treating drilling fluid produced in the oil and gas drilling process. Background technique [0002] Drilling fluid is a circulating fluid used in the drilling process, which is a mixture of liquid, solid and chemical treatment agents. The circulation of drilling fluid is that after the drilling fluid is pressurized by the drilling pump to obtain water pressure, it is transported to the inner cavity of the drill pipe through the high-pressure manifold and the faucet, flows along the inner cavity of the drill pipe to the ground, and is sprayed out from the nozzle of the drill bit to put the drill bit in the formation. The broken cuttings are brought back to the ground along the annular space outside the drill pipe, and the large cuttings, barite and other large solid particles in the (mud) returned to the ground from the w...

AI Technical Summary

Problems solved by technology

This traditional waste drilling fluid treatment method has the following disadvantages: ①After the natural settlement of the mud, the clarified mud water above is recycled as drilling fluid. Because of the high viscosity and specific gravity of the mud, the solid particles in it can only be slightly reduced. If you continue to use this kind of mud, some cuttings and gravel will inevitably enter the mud pump with the mud and be sent to the bottom of the well again, causing the mud pump to be easily damaged and the life of the drill bit will be greatly shortened. The debris and sand damage the wall-building performance of the mud, and even cause accidents such as well collapse and drill sticking; Rainstorms and other water sources gather at the well site, and waste drilling fluid may leak into adjacent farmland, water bodies, and surface soil, damaging the ecological environment near the well site; ③ Currently, in-situ burial has been banned in some areas, and it is required to clean up after completion of the well , the cleaning work is time-consuming and costly; ④ The method of digging holes on the spot itself is labor-intensive and inefficient

Main disadvantages: ①The storage tank occupies a large area; ②High transportation costs; ③High cost; ④Low efficiency; In terms of the problem, the cost of weight and barite in the drilling fluid accounts for about 75% of the total material cost of the drilling fluid, and the useful part of the mud fluid cannot be recycled, resulting in high drilling operating costs

The purification process of drilling fluid solid control equipment is roughly: wellhead (drilling fluid returned) → drilling fluid shale shaker → vacuum degasser → drilling fluid desander → desilter → drilling fluid centrifuge → purified drilling fluid returns Wellhead, the main shortcomings: ① It is difficult to select the mesh of the drilling fluid shale shaker, and the mesh is easy to block, which affects the treatment effect; ③Due to insufficient equipment in the process before the drilling fluid centrifuge, mud with large particle size (greater than 20 μm) enters the high-speed centrifuge, affecting the separation effect of the drilling centrifuge, resulting in the solid phase of the processed drilling fluid More particles, short service life of the drill bit

The solid phase control system of American Petroleum Tools Co., Ltd. consists of 4 vibrating screens and two dryers; the 4 vibrating screens and one dryer are connected in parallel, and the drilling fluid returned from the well is diverted to 4 vibrating machines by the drilling fluid distributor. sieve and a dryer, and the solid phase particles separated by them are processed by another dryer to further dehydrate the particles; the liquid recovered and the dried particles are discharged. The main disadvantages are: ① vibrating screen It is difficult to choose the screen mesh of dryer and dryer, and the screen is easy to block; ②The imported products are expensive, the cost of accessories is high, and the cycle is long

[0008] The patent No. 201420016318.4 is a utility model patent "A Disposal Drilling Fluid Treatment System and Its Collection Device", which mainly has shortcomings: the useful part of the drilling fluid cannot be recycled, resulting in high drilling operation costs

[0009] The patent No. 201320881564.1 utility model patent "Waste Fluid Drilling Fluid Treatment Device" has the main deficiency: after the waste drilling fluid passes through the destabilization separation unit, there is no concentration process, and it directly enters the plate and frame filter press. Due to the low concentration of the feed, it causes Plate and frame filter press has low working efficiency

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